opencv/modules/objdetect/src/hog.cpp

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#include "precomp.hpp"
#include "cascadedetect.hpp"
#include "opencv2/core/core_c.h"
#include "opencl_kernels_objdetect.hpp"

#include <cstdio>
#include <iterator>
#include <limits>

/****************************************************************************************\
      The code below is implementation of HOG (Histogram-of-Oriented Gradients)
      descriptor and object detection, introduced by Navneet Dalal and Bill Triggs.

      The computed feature vectors are compatible with the
      INRIA Object Detection and Localization Toolkit
      (http://pascal.inrialpes.fr/soft/olt/)
\****************************************************************************************/

namespace cv
{

#define NTHREADS 256

static int numPartsWithin(int size, int part_size, int stride)
{
    return (size - part_size + stride) / stride;
}

static Size numPartsWithin(cv::Size size, cv::Size part_size,
                                                cv::Size stride)
{
    return Size(numPartsWithin(size.width, part_size.width, stride.width),
        numPartsWithin(size.height, part_size.height, stride.height));
}

static size_t getBlockHistogramSize(Size block_size, Size cell_size, int nbins)
{
    Size cells_per_block = Size(block_size.width / cell_size.width,
        block_size.height / cell_size.height);
    return (size_t)(nbins * cells_per_block.area());
}

size_t HOGDescriptor::getDescriptorSize() const
{
    CV_Assert(blockSize.width % cellSize.width == 0 &&
        blockSize.height % cellSize.height == 0);
    CV_Assert((winSize.width - blockSize.width) % blockStride.width == 0 &&
        (winSize.height - blockSize.height) % blockStride.height == 0 );

    return (size_t)nbins*
        (blockSize.width/cellSize.width)*
        (blockSize.height/cellSize.height)*
        ((winSize.width - blockSize.width)/blockStride.width + 1)*
        ((winSize.height - blockSize.height)/blockStride.height + 1);
}

double HOGDescriptor::getWinSigma() const
{
    return winSigma > 0 ? winSigma : (blockSize.width + blockSize.height)/8.;
}

bool HOGDescriptor::checkDetectorSize() const
{
    size_t detectorSize = svmDetector.size(), descriptorSize = getDescriptorSize();
    return detectorSize == 0 ||
        detectorSize == descriptorSize ||
        detectorSize == descriptorSize + 1;
}

void HOGDescriptor::setSVMDetector(InputArray _svmDetector)
{
    _svmDetector.getMat().convertTo(svmDetector, CV_32F);
    CV_Assert(checkDetectorSize());

    Mat detector_reordered(1, (int)svmDetector.size(), CV_32FC1);

    size_t block_hist_size = getBlockHistogramSize(blockSize, cellSize, nbins);
    cv::Size blocks_per_img = numPartsWithin(winSize, blockSize, blockStride);

    for (int i = 0; i < blocks_per_img.height; ++i)
        for (int j = 0; j < blocks_per_img.width; ++j)
        {
            const float *src = &svmDetector[0] + (j * blocks_per_img.height + i) * block_hist_size;
            float *dst = detector_reordered.ptr<float>() + (i * blocks_per_img.width + j) * block_hist_size;
            for (size_t k = 0; k < block_hist_size; ++k)
                dst[k] = src[k];
        }
    size_t descriptor_size = getDescriptorSize();
    free_coef = svmDetector.size() > descriptor_size ? svmDetector[descriptor_size] : 0;
    detector_reordered.copyTo(oclSvmDetector);
}

#define CV_TYPE_NAME_HOG_DESCRIPTOR "opencv-object-detector-hog"

bool HOGDescriptor::read(FileNode& obj)
{
    CV_Assert(!obj["winSize"].empty());

    if( !obj.isMap() )
        return false;
    FileNodeIterator it = obj["winSize"].begin();
    it >> winSize.width >> winSize.height;
    it = obj["blockSize"].begin();
    it >> blockSize.width >> blockSize.height;
    it = obj["blockStride"].begin();
    it >> blockStride.width >> blockStride.height;
    it = obj["cellSize"].begin();
    it >> cellSize.width >> cellSize.height;
    obj["nbins"] >> nbins;
    obj["derivAperture"] >> derivAperture;
    obj["winSigma"] >> winSigma;
    obj["histogramNormType"] >> histogramNormType;
    obj["L2HysThreshold"] >> L2HysThreshold;
    obj["gammaCorrection"] >> gammaCorrection;
    obj["nlevels"] >> nlevels;
    if (obj["signedGradient"].empty())
        signedGradient = false;
    else
        obj["signedGradient"] >> signedGradient;

    FileNode vecNode = obj["SVMDetector"];
    if( vecNode.isSeq() )
    {
        std::vector<float> _svmDetector;
        vecNode >> _svmDetector;
        setSVMDetector(_svmDetector);
    }
    return true;
}

void HOGDescriptor::write(FileStorage& fs, const String& objName) const
{
    if( !objName.empty() )
        fs << objName;

    fs << "{" CV_TYPE_NAME_HOG_DESCRIPTOR
       << "winSize" << winSize
       << "blockSize" << blockSize
       << "blockStride" << blockStride
       << "cellSize" << cellSize
       << "nbins" << nbins
       << "derivAperture" << derivAperture
       << "winSigma" << getWinSigma()
       << "histogramNormType" << histogramNormType
       << "L2HysThreshold" << L2HysThreshold
       << "gammaCorrection" << gammaCorrection
       << "nlevels" << nlevels
       << "signedGradient" << signedGradient;
    if( !svmDetector.empty() )
        fs << "SVMDetector" << svmDetector;
    fs << "}";
}

bool HOGDescriptor::load(const String& filename, const String& objname)
{
    FileStorage fs(filename, FileStorage::READ);
    FileNode obj = !objname.empty() ? fs[objname] : fs.getFirstTopLevelNode();
    return read(obj);
}

void HOGDescriptor::save(const String& filename, const String& objName) const
{
    FileStorage fs(filename, FileStorage::WRITE);
    write(fs, !objName.empty() ? objName : FileStorage::getDefaultObjectName(filename));
}

void HOGDescriptor::copyTo(HOGDescriptor& c) const
{
    c.winSize = winSize;
    c.blockSize = blockSize;
    c.blockStride = blockStride;
    c.cellSize = cellSize;
    c.nbins = nbins;
    c.derivAperture = derivAperture;
    c.winSigma = winSigma;
    c.histogramNormType = histogramNormType;
    c.L2HysThreshold = L2HysThreshold;
    c.gammaCorrection = gammaCorrection;
    c.setSVMDetector(svmDetector);
    c.nlevels = nlevels;
    c.signedGradient = signedGradient;
}

#if CV_NEON
// replace of _mm_set_ps
inline float32x4_t vsetq_f32(float f0, float f1, float f2, float f3)
{
    float32x4_t a = vdupq_n_f32(f0);
    a = vsetq_lane_f32(f1, a, 1);
    a = vsetq_lane_f32(f2, a, 2);
    a = vsetq_lane_f32(f3, a, 3);
    return a;
}
#endif
void HOGDescriptor::computeGradient(InputArray _img, InputOutputArray _grad, InputOutputArray _qangle,
    Size paddingTL, Size paddingBR) const
{
    CV_INSTRUMENT_REGION();

    Mat img = _img.getMat();
    CV_Assert(!img.empty());
    CV_Assert( img.type() == CV_8U || img.type() == CV_8UC3 );

    Size gradsize(img.cols + paddingTL.width + paddingBR.width,
        img.rows + paddingTL.height + paddingBR.height);
    _grad.create(gradsize, CV_32FC2);  // <magnitude*(1-alpha), magnitude*alpha>
    _qangle.create(gradsize, CV_8UC2); // [0..nbins-1] - quantized gradient orientation
    Mat grad = _grad.getMat();
    Mat qangle = _qangle.getMat();

    Size wholeSize;
    Point roiofs;
    img.locateROI(wholeSize, roiofs);

    int i, x, y;
    int cn = img.channels();

    Mat_<float> _lut(1, 256);
    const float* const lut = &_lut(0,0);
#if CV_SSE2
    const int indices[] = { 0, 1, 2, 3 };
    __m128i idx = _mm_loadu_si128((const __m128i*)indices);
    __m128i ifour = _mm_set1_epi32(4);

    float* const _data = &_lut(0, 0);
    if( gammaCorrection )
        for( i = 0; i < 256; i += 4 )
        {
            _mm_storeu_ps(_data + i, _mm_sqrt_ps(_mm_cvtepi32_ps(idx)));
            idx = _mm_add_epi32(idx, ifour);
        }
    else
        for( i = 0; i < 256; i += 4 )
        {
            _mm_storeu_ps(_data + i, _mm_cvtepi32_ps(idx));
            idx = _mm_add_epi32(idx, ifour);
        }
#elif CV_NEON
    const int indices[] = { 0, 1, 2, 3 };
    uint32x4_t idx = *(uint32x4_t*)indices;
    uint32x4_t ifour = vdupq_n_u32(4);

    float* const _data = &_lut(0, 0);
    if( gammaCorrection )
        for( i = 0; i < 256; i++ )
            _lut(0,i) = std::sqrt((float)i);
    else
        for( i = 0; i < 256; i += 4 )
        {
            vst1q_f32(_data + i, vcvtq_f32_u32(idx));
            idx = vaddq_u32 (idx, ifour);
        }
#else
    if( gammaCorrection )
        for( i = 0; i < 256; i++ )
            _lut(0,i) = std::sqrt((float)i);
    else
        for( i = 0; i < 256; i++ )
            _lut(0,i) = (float)i;
#endif

    AutoBuffer<int> mapbuf(gradsize.width + gradsize.height + 4);
    int* xmap = mapbuf.data() + 1;
    int* ymap = xmap + gradsize.width + 2;

    const int borderType = (int)BORDER_REFLECT_101;

    for( x = -1; x < gradsize.width + 1; x++ )
        xmap[x] = borderInterpolate(x - paddingTL.width + roiofs.x,
        wholeSize.width, borderType) - roiofs.x;
    for( y = -1; y < gradsize.height + 1; y++ )
        ymap[y] = borderInterpolate(y - paddingTL.height + roiofs.y,
        wholeSize.height, borderType) - roiofs.y;

    // x- & y- derivatives for the whole row
    int width = gradsize.width;
    AutoBuffer<float> _dbuf(width*4);
    float* const dbuf = _dbuf.data();
    Mat Dx(1, width, CV_32F, dbuf);
    Mat Dy(1, width, CV_32F, dbuf + width);
    Mat Mag(1, width, CV_32F, dbuf + width*2);
    Mat Angle(1, width, CV_32F, dbuf + width*3);

    if (cn == 3)
    {
        int end = gradsize.width + 2;
        xmap -= 1, x = 0;
#if CV_SSE2
        for ( ; x <= end - 4; x += 4)
        {
            __m128i mul_res = _mm_loadu_si128((const __m128i*)(xmap + x));
            mul_res = _mm_add_epi32(_mm_add_epi32(mul_res, mul_res), mul_res); // multiply by 3
            _mm_storeu_si128((__m128i*)(xmap + x), mul_res);
        }
#elif CV_NEON
        int32x4_t ithree = vdupq_n_s32(3);
        for ( ; x <= end - 4; x += 4)
            vst1q_s32(xmap + x, vmulq_s32(ithree, vld1q_s32(xmap + x)));
#endif
        for ( ; x < end; ++x)
            xmap[x] *= 3;
        xmap += 1;
    }

    float angleScale = signedGradient ? (float)(nbins/(2.0*CV_PI)) : (float)(nbins/CV_PI);
    for( y = 0; y < gradsize.height; y++ )
    {
        const uchar* imgPtr  = img.ptr(ymap[y]);
        //In case subimage is used ptr() generates an assert for next and prev rows
        //(see http://code.opencv.org/issues/4149)
        const uchar* prevPtr = img.data + img.step*ymap[y-1];
        const uchar* nextPtr = img.data + img.step*ymap[y+1];

        float* gradPtr = grad.ptr<float>(y);
        uchar* qanglePtr = qangle.ptr(y);

        if( cn == 1 )
        {
            for( x = 0; x < width; x++ )
            {
                int x1 = xmap[x];
                dbuf[x] = (float)(lut[imgPtr[xmap[x+1]]] - lut[imgPtr[xmap[x-1]]]);
                dbuf[width + x] = (float)(lut[nextPtr[x1]] - lut[prevPtr[x1]]);
            }
        }
        else
        {
            x = 0;
#if CV_SSE2
            for( ; x <= width - 4; x += 4 )
            {
                int x0 = xmap[x], x1 = xmap[x+1], x2 = xmap[x+2], x3 = xmap[x+3];
                typedef const uchar* const T;
                T p02 = imgPtr + xmap[x+1], p00 = imgPtr + xmap[x-1];
                T p12 = imgPtr + xmap[x+2], p10 = imgPtr + xmap[x];
                T p22 = imgPtr + xmap[x+3], p20 = p02;
                T p32 = imgPtr + xmap[x+4], p30 = p12;

                __m128 _dx0 = _mm_sub_ps(_mm_set_ps(lut[p32[0]], lut[p22[0]], lut[p12[0]], lut[p02[0]]),
                                         _mm_set_ps(lut[p30[0]], lut[p20[0]], lut[p10[0]], lut[p00[0]]));
                __m128 _dx1 = _mm_sub_ps(_mm_set_ps(lut[p32[1]], lut[p22[1]], lut[p12[1]], lut[p02[1]]),
                                         _mm_set_ps(lut[p30[1]], lut[p20[1]], lut[p10[1]], lut[p00[1]]));
                __m128 _dx2 = _mm_sub_ps(_mm_set_ps(lut[p32[2]], lut[p22[2]], lut[p12[2]], lut[p02[2]]),
                                         _mm_set_ps(lut[p30[2]], lut[p20[2]], lut[p10[2]], lut[p00[2]]));

                __m128 _dy0 = _mm_sub_ps(_mm_set_ps(lut[nextPtr[x3]], lut[nextPtr[x2]], lut[nextPtr[x1]], lut[nextPtr[x0]]),
                                         _mm_set_ps(lut[prevPtr[x3]], lut[prevPtr[x2]], lut[prevPtr[x1]], lut[prevPtr[x0]]));
                __m128 _dy1 = _mm_sub_ps(_mm_set_ps(lut[nextPtr[x3+1]], lut[nextPtr[x2+1]], lut[nextPtr[x1+1]], lut[nextPtr[x0+1]]),
                                         _mm_set_ps(lut[prevPtr[x3+1]], lut[prevPtr[x2+1]], lut[prevPtr[x1+1]], lut[prevPtr[x0+1]]));
                __m128 _dy2 = _mm_sub_ps(_mm_set_ps(lut[nextPtr[x3+2]], lut[nextPtr[x2+2]], lut[nextPtr[x1+2]], lut[nextPtr[x0+2]]),
                                         _mm_set_ps(lut[prevPtr[x3+2]], lut[prevPtr[x2+2]], lut[prevPtr[x1+2]], lut[prevPtr[x0+2]]));

                __m128 _mag0 = _mm_add_ps(_mm_mul_ps(_dx0, _dx0), _mm_mul_ps(_dy0, _dy0));
                __m128 _mag1 = _mm_add_ps(_mm_mul_ps(_dx1, _dx1), _mm_mul_ps(_dy1, _dy1));
                __m128 _mag2 = _mm_add_ps(_mm_mul_ps(_dx2, _dx2), _mm_mul_ps(_dy2, _dy2));

                __m128 mask = _mm_cmpgt_ps(_mag2, _mag1);
                _dx2 = _mm_or_ps(_mm_and_ps(_dx2, mask), _mm_andnot_ps(mask, _dx1));
                _dy2 = _mm_or_ps(_mm_and_ps(_dy2, mask), _mm_andnot_ps(mask, _dy1));

                mask = _mm_cmpgt_ps(_mm_max_ps(_mag2, _mag1), _mag0);
                _dx2 = _mm_or_ps(_mm_and_ps(_dx2, mask), _mm_andnot_ps(mask, _dx0));
                _dy2 = _mm_or_ps(_mm_and_ps(_dy2, mask), _mm_andnot_ps(mask, _dy0));

                _mm_storeu_ps(dbuf + x, _dx2);
                _mm_storeu_ps(dbuf + x + width, _dy2);
            }
#elif CV_NEON
            for( ; x <= width - 4; x += 4 )
            {
                int x0 = xmap[x], x1 = xmap[x+1], x2 = xmap[x+2], x3 = xmap[x+3];
                typedef const uchar* const T;
                T p02 = imgPtr + xmap[x+1], p00 = imgPtr + xmap[x-1];
                T p12 = imgPtr + xmap[x+2], p10 = imgPtr + xmap[x];
                T p22 = imgPtr + xmap[x+3], p20 = p02;
                T p32 = imgPtr + xmap[x+4], p30 = p12;

                float32x4_t _dx0 = vsubq_f32(vsetq_f32(lut[p02[0]], lut[p12[0]], lut[p22[0]], lut[p32[0]]),
                                             vsetq_f32(lut[p00[0]], lut[p10[0]], lut[p20[0]], lut[p30[0]]));
                float32x4_t _dx1 = vsubq_f32(vsetq_f32(lut[p02[1]], lut[p12[1]], lut[p22[1]], lut[p32[1]]),
                                             vsetq_f32(lut[p00[1]], lut[p10[1]], lut[p20[1]], lut[p30[1]]));
                float32x4_t _dx2 = vsubq_f32(vsetq_f32(lut[p02[2]], lut[p12[2]], lut[p22[2]], lut[p32[2]]),
                                             vsetq_f32(lut[p00[2]], lut[p10[2]], lut[p20[2]], lut[p30[2]]));

                float32x4_t _dy0 = vsubq_f32(vsetq_f32(lut[nextPtr[x0]], lut[nextPtr[x1]], lut[nextPtr[x2]], lut[nextPtr[x3]]),
                                             vsetq_f32(lut[prevPtr[x0]], lut[prevPtr[x1]], lut[prevPtr[x2]], lut[prevPtr[x3]]));
                float32x4_t _dy1 = vsubq_f32(vsetq_f32(lut[nextPtr[x0+1]], lut[nextPtr[x1+1]], lut[nextPtr[x2+1]], lut[nextPtr[x3+1]]),
                                             vsetq_f32(lut[prevPtr[x0+1]], lut[prevPtr[x1+1]], lut[prevPtr[x2+1]], lut[prevPtr[x3+1]]));
                float32x4_t _dy2 = vsubq_f32(vsetq_f32(lut[nextPtr[x0+2]], lut[nextPtr[x1+2]], lut[nextPtr[x2+2]], lut[nextPtr[x3+2]]),
                                             vsetq_f32(lut[prevPtr[x0+2]], lut[prevPtr[x1+2]], lut[prevPtr[x2+2]], lut[prevPtr[x3+2]]));

                float32x4_t _mag0 = vaddq_f32(vmulq_f32(_dx0, _dx0), vmulq_f32(_dy0, _dy0));
                float32x4_t _mag1 = vaddq_f32(vmulq_f32(_dx1, _dx1), vmulq_f32(_dy1, _dy1));
                float32x4_t _mag2 = vaddq_f32(vmulq_f32(_dx2, _dx2), vmulq_f32(_dy2, _dy2));

                uint32x4_t mask = vcgtq_f32(_mag2, _mag1);
                _dx2 = vbslq_f32(mask, _dx2, _dx1);
                _dy2 = vbslq_f32(mask, _dy2, _dy1);

                mask = vcgtq_f32(vmaxq_f32(_mag2, _mag1), _mag0);
                _dx2 = vbslq_f32(mask, _dx2, _dx0);
                _dy2 = vbslq_f32(mask, _dy2, _dy0);

                vst1q_f32(dbuf + x, _dx2);
                vst1q_f32(dbuf + x + width, _dy2);
            }
#endif
            for( ; x < width; x++ )
            {
                int x1 = xmap[x];
                float dx0, dy0, dx, dy, mag0, mag;
                const uchar* p2 = imgPtr + xmap[x+1];
                const uchar* p0 = imgPtr + xmap[x-1];

                dx0 = lut[p2[2]] - lut[p0[2]];
                dy0 = lut[nextPtr[x1+2]] - lut[prevPtr[x1+2]];
                mag0 = dx0*dx0 + dy0*dy0;

                dx = lut[p2[1]] - lut[p0[1]];
                dy = lut[nextPtr[x1+1]] - lut[prevPtr[x1+1]];
                mag = dx*dx + dy*dy;
                if( mag0 < mag )
                {
                    dx0 = dx;
                    dy0 = dy;
                    mag0 = mag;
                }

                dx = lut[p2[0]] - lut[p0[0]];
                dy = lut[nextPtr[x1]] - lut[prevPtr[x1]];
                mag = dx*dx + dy*dy;
                if( mag0 < mag )
                {
                    dx0 = dx;
                    dy0 = dy;
                    mag0 = mag;
                }

                dbuf[x] = dx0;
                dbuf[x+width] = dy0;
            }
        }

        // computing angles and magnidutes
        cartToPolar( Dx, Dy, Mag, Angle, false );

        // filling the result matrix
        x = 0;
#if CV_SSE2
        __m128 fhalf = _mm_set1_ps(0.5f), fzero = _mm_setzero_ps();
        __m128 _angleScale = _mm_set1_ps(angleScale), fone = _mm_set1_ps(1.0f);
        __m128i ione = _mm_set1_epi32(1), _nbins = _mm_set1_epi32(nbins), izero = _mm_setzero_si128();

        for ( ; x <= width - 4; x += 4)
        {
            int x2 = x << 1;
            __m128 _mag = _mm_loadu_ps(dbuf + x + (width << 1));
            __m128 _angle = _mm_loadu_ps(dbuf + x + width * 3);
            _angle = _mm_sub_ps(_mm_mul_ps(_angleScale, _angle), fhalf);

            __m128 sign = _mm_and_ps(fone, _mm_cmplt_ps(_angle, fzero));
            __m128i _hidx = _mm_cvttps_epi32(_angle);
            _hidx = _mm_sub_epi32(_hidx, _mm_cvtps_epi32(sign));
            _angle = _mm_sub_ps(_angle, _mm_cvtepi32_ps(_hidx));

            __m128 ft0 = _mm_mul_ps(_mag, _mm_sub_ps(fone, _angle));
            __m128 ft1 = _mm_mul_ps(_mag, _angle);
            __m128 ft2 = _mm_unpacklo_ps(ft0, ft1);
            __m128 ft3 = _mm_unpackhi_ps(ft0, ft1);

            _mm_storeu_ps(gradPtr + x2, ft2);
            _mm_storeu_ps(gradPtr + x2 + 4, ft3);

            __m128i mask0 = _mm_sub_epi32(izero, _mm_srli_epi32(_hidx, 31));
            __m128i it0 = _mm_and_si128(mask0, _nbins);
            mask0 = _mm_cmplt_epi32(_hidx, _nbins);
            __m128i it1 = _mm_andnot_si128(mask0, _nbins);
            _hidx = _mm_add_epi32(_hidx, _mm_sub_epi32(it0, it1));

            it0 = _mm_packus_epi16(_mm_packs_epi32(_hidx, izero), izero);
            _hidx = _mm_add_epi32(ione, _hidx);
            _hidx = _mm_and_si128(_hidx, _mm_cmplt_epi32(_hidx, _nbins));
            it1 = _mm_packus_epi16(_mm_packs_epi32(_hidx, izero), izero);
            it0 = _mm_unpacklo_epi8(it0, it1);

            _mm_storel_epi64((__m128i*)(qanglePtr + x2), it0);
        }
#endif
        for( ; x < width; x++ )
        {
            float mag = dbuf[x+width*2], angle = dbuf[x+width*3]*angleScale - 0.5f;
            int hidx = cvFloor(angle);
            angle -= hidx;
            gradPtr[x*2] = mag*(1.f - angle);
            gradPtr[x*2+1] = mag*angle;

            if( hidx < 0 )
                hidx += nbins;
            else if( hidx >= nbins )
                hidx -= nbins;

            CV_Assert( (unsigned)hidx < (unsigned)nbins );

            qanglePtr[x*2] = (uchar)hidx;
            hidx++;
            hidx &= hidx < nbins ? -1 : 0;
            qanglePtr[x*2+1] = (uchar)hidx;
        }
    }
}

struct HOGCache
{
    struct BlockData
    {
        BlockData() :
            histOfs(0), imgOffset()
        { }

        int histOfs;
        Point imgOffset;
    };

    struct PixData
    {
        size_t gradOfs, qangleOfs;
        int histOfs[4];
        float histWeights[4];
        float gradWeight;
    };

    HOGCache();
    HOGCache(const HOGDescriptor* descriptor,
        const Mat& img, const Size& paddingTL, const Size& paddingBR,
        bool useCache, const Size& cacheStride);
    virtual ~HOGCache() { }
    virtual void init(const HOGDescriptor* descriptor,
        const Mat& img, const Size& paddingTL, const Size& paddingBR,
        bool useCache, const Size& cacheStride);

    Size windowsInImage(const Size& imageSize, const Size& winStride) const;
    Rect getWindow(const Size& imageSize, const Size& winStride, int idx) const;

    const float* getBlock(Point pt, float* buf);
    virtual void normalizeBlockHistogram(float* histogram) const;

    std::vector<PixData> pixData;
    std::vector<BlockData> blockData;

    bool useCache;
    std::vector<int> ymaxCached;
    Size winSize;
    Size cacheStride;
    Size nblocks, ncells;
    int blockHistogramSize;
    int count1, count2, count4;
    Point imgoffset;
    Mat_<float> blockCache;
    Mat_<uchar> blockCacheFlags;

    Mat grad, qangle;
    const HOGDescriptor* descriptor;
};

HOGCache::HOGCache() :
    blockHistogramSize(), count1(), count2(), count4()
{
    useCache = false;
    descriptor = 0;
}

HOGCache::HOGCache(const HOGDescriptor* _descriptor,
    const Mat& _img, const Size& _paddingTL, const Size& _paddingBR,
    bool _useCache, const Size& _cacheStride)
{
    init(_descriptor, _img, _paddingTL, _paddingBR, _useCache, _cacheStride);
}

void HOGCache::init(const HOGDescriptor* _descriptor,
    const Mat& _img, const Size& _paddingTL, const Size& _paddingBR,
    bool _useCache, const Size& _cacheStride)
{
    descriptor = _descriptor;
    cacheStride = _cacheStride;
    useCache = _useCache;

    descriptor->computeGradient(_img, grad, qangle, _paddingTL, _paddingBR);
    imgoffset = _paddingTL;

    winSize = descriptor->winSize;
    Size blockSize = descriptor->blockSize;
    Size blockStride = descriptor->blockStride;
    Size cellSize = descriptor->cellSize;
    int i, j, nbins = descriptor->nbins;
    int rawBlockSize = blockSize.width*blockSize.height;

    nblocks = Size((winSize.width - blockSize.width)/blockStride.width + 1,
        (winSize.height - blockSize.height)/blockStride.height + 1);
    ncells = Size(blockSize.width/cellSize.width, blockSize.height/cellSize.height);
    blockHistogramSize = ncells.width*ncells.height*nbins;

    if( useCache )
    {
        Size cacheSize((grad.cols - blockSize.width)/cacheStride.width+1,
            (winSize.height/cacheStride.height)+1);

        blockCache.create(cacheSize.height, cacheSize.width*blockHistogramSize);
        blockCacheFlags.create(cacheSize);

        size_t cacheRows = blockCache.rows;
        ymaxCached.resize(cacheRows);
        for(size_t ii = 0; ii < cacheRows; ii++ )
            ymaxCached[ii] = -1;
    }

    Mat_<float> weights(blockSize);
    float sigma = (float)descriptor->getWinSigma();
    float scale = 1.f/(sigma*sigma*2);

    {
        AutoBuffer<float> di(blockSize.height), dj(blockSize.width);
        float* _di = di.data(), *_dj = dj.data();
        float bh = blockSize.height * 0.5f, bw = blockSize.width * 0.5f;

        i = 0;
    #if CV_SSE2
        const int a[] = { 0, 1, 2, 3 };
        __m128i idx = _mm_loadu_si128((__m128i*)a);
        __m128 _bw = _mm_set1_ps(bw), _bh = _mm_set1_ps(bh);
        __m128i ifour = _mm_set1_epi32(4);

        for (; i <= blockSize.height - 4; i += 4)
        {
            __m128 t = _mm_sub_ps(_mm_cvtepi32_ps(idx), _bh);
            t = _mm_mul_ps(t, t);
            idx = _mm_add_epi32(idx, ifour);
            _mm_storeu_ps(_di + i, t);
        }
    #elif CV_NEON
        const int a[] = { 0, 1, 2, 3 };
        int32x4_t idx = vld1q_s32(a);
        float32x4_t _bw = vdupq_n_f32(bw), _bh = vdupq_n_f32(bh);
        int32x4_t ifour = vdupq_n_s32(4);

        for (; i <= blockSize.height - 4; i += 4)
        {
            float32x4_t t = vsubq_f32(vcvtq_f32_s32(idx), _bh);
            t = vmulq_f32(t, t);
            idx = vaddq_s32(idx, ifour);
            vst1q_f32(_di + i, t);
        }
    #endif
        for ( ; i < blockSize.height; ++i)
        {
            _di[i] = i - bh;
            _di[i] *= _di[i];
        }

        j = 0;
    #if CV_SSE2
        idx = _mm_loadu_si128((__m128i*)a);
        for (; j <= blockSize.width - 4; j += 4)
        {
            __m128 t = _mm_sub_ps(_mm_cvtepi32_ps(idx), _bw);
            t = _mm_mul_ps(t, t);
            idx = _mm_add_epi32(idx, ifour);
            _mm_storeu_ps(_dj + j, t);
        }
    #elif CV_NEON
        idx = vld1q_s32(a);
        for (; j <= blockSize.width - 4; j += 4)
        {
            float32x4_t t = vsubq_f32(vcvtq_f32_s32(idx), _bw);
            t = vmulq_f32(t, t);
            idx = vaddq_s32(idx, ifour);
            vst1q_f32(_dj + j, t);
        }
    #endif
        for ( ; j < blockSize.width; ++j)
        {
            _dj[j] = j - bw;
            _dj[j] *= _dj[j];
        }

        for(i = 0; i < blockSize.height; i++)
            for(j = 0; j < blockSize.width; j++)
                weights(i,j) = std::exp(-(_di[i] + _dj[j])*scale);
    }

    blockData.resize(nblocks.width*nblocks.height);
    pixData.resize(rawBlockSize*3);

    // Initialize 2 lookup tables, pixData & blockData.
    // Here is why:
    //
    // The detection algorithm runs in 4 nested loops (at each pyramid layer):
    //  loop over the windows within the input image
    //    loop over the blocks within each window
    //      loop over the cells within each block
    //        loop over the pixels in each cell
    //
    // As each of the loops runs over a 2-dimensional array,
    // we could get 8(!) nested loops in total, which is very-very slow.
    //
    // To speed the things up, we do the following:
    //   1. loop over windows is unrolled in the HOGDescriptor::{compute|detect} methods;
    //         inside we compute the current search window using getWindow() method.
    //         Yes, it involves some overhead (function call + couple of divisions),
    //         but it's tiny in fact.
    //   2. loop over the blocks is also unrolled. Inside we use pre-computed blockData[j]
    //         to set up gradient and histogram pointers.
    //   3. loops over cells and pixels in each cell are merged
    //       (since there is no overlap between cells, each pixel in the block is processed once)
    //      and also unrolled. Inside we use PixData[k] to access the gradient values and
    //      update the histogram
    //

    count1 = count2 = count4 = 0;
    for( j = 0; j < blockSize.width; j++ )
        for( i = 0; i < blockSize.height; i++ )
        {
            PixData* data = 0;
            float cellX = (j+0.5f)/cellSize.width - 0.5f;
            float cellY = (i+0.5f)/cellSize.height - 0.5f;
            int icellX0 = cvFloor(cellX);
            int icellY0 = cvFloor(cellY);
            int icellX1 = icellX0 + 1, icellY1 = icellY0 + 1;
            cellX -= icellX0;
            cellY -= icellY0;

            if( (unsigned)icellX0 < (unsigned)ncells.width &&
               (unsigned)icellX1 < (unsigned)ncells.width )
            {
                if( (unsigned)icellY0 < (unsigned)ncells.height &&
                   (unsigned)icellY1 < (unsigned)ncells.height )
                {
                    data = &pixData[rawBlockSize*2 + (count4++)];
                    data->histOfs[0] = (icellX0*ncells.height + icellY0)*nbins;
                    data->histWeights[0] = (1.f - cellX)*(1.f - cellY);
                    data->histOfs[1] = (icellX1*ncells.height + icellY0)*nbins;
                    data->histWeights[1] = cellX*(1.f - cellY);
                    data->histOfs[2] = (icellX0*ncells.height + icellY1)*nbins;
                    data->histWeights[2] = (1.f - cellX)*cellY;
                    data->histOfs[3] = (icellX1*ncells.height + icellY1)*nbins;
                    data->histWeights[3] = cellX*cellY;
                }
                else
                {
                    data = &pixData[rawBlockSize + (count2++)];
                    if( (unsigned)icellY0 < (unsigned)ncells.height )
                    {
                        icellY1 = icellY0;
                        cellY = 1.f - cellY;
                    }
                    data->histOfs[0] = (icellX0*ncells.height + icellY1)*nbins;
                    data->histWeights[0] = (1.f - cellX)*cellY;
                    data->histOfs[1] = (icellX1*ncells.height + icellY1)*nbins;
                    data->histWeights[1] = cellX*cellY;
                    data->histOfs[2] = data->histOfs[3] = 0;
                    data->histWeights[2] = data->histWeights[3] = 0;
                }
            }
            else
            {
                if( (unsigned)icellX0 < (unsigned)ncells.width )
                {
                    icellX1 = icellX0;
                    cellX = 1.f - cellX;
                }

                if( (unsigned)icellY0 < (unsigned)ncells.height &&
                   (unsigned)icellY1 < (unsigned)ncells.height )
                {
                    data = &pixData[rawBlockSize + (count2++)];
                    data->histOfs[0] = (icellX1*ncells.height + icellY0)*nbins;
                    data->histWeights[0] = cellX*(1.f - cellY);
                    data->histOfs[1] = (icellX1*ncells.height + icellY1)*nbins;
                    data->histWeights[1] = cellX*cellY;
                    data->histOfs[2] = data->histOfs[3] = 0;
                    data->histWeights[2] = data->histWeights[3] = 0;
                }
                else
                {
                    data = &pixData[count1++];
                    if( (unsigned)icellY0 < (unsigned)ncells.height )
                    {
                        icellY1 = icellY0;
                        cellY = 1.f - cellY;
                    }
                    data->histOfs[0] = (icellX1*ncells.height + icellY1)*nbins;
                    data->histWeights[0] = cellX*cellY;
                    data->histOfs[1] = data->histOfs[2] = data->histOfs[3] = 0;
                    data->histWeights[1] = data->histWeights[2] = data->histWeights[3] = 0;
                }
            }
            data->gradOfs = (grad.cols*i + j)*2;
            data->qangleOfs = (qangle.cols*i + j)*2;
            data->gradWeight = weights(i,j);
        }

    assert( count1 + count2 + count4 == rawBlockSize );
    // defragment pixData
    for( j = 0; j < count2; j++ )
        pixData[j + count1] = pixData[j + rawBlockSize];
    for( j = 0; j < count4; j++ )
        pixData[j + count1 + count2] = pixData[j + rawBlockSize*2];
    count2 += count1;
    count4 += count2;

    // initialize blockData
    for( j = 0; j < nblocks.width; j++ )
        for( i = 0; i < nblocks.height; i++ )
        {
            BlockData& data = blockData[j*nblocks.height + i];
            data.histOfs = (j*nblocks.height + i)*blockHistogramSize;
            data.imgOffset = Point(j*blockStride.width,i*blockStride.height);
        }
}

const float* HOGCache::getBlock(Point pt, float* buf)
{
    float* blockHist = buf;
    assert(descriptor != 0);

//    Size blockSize = descriptor->blockSize;
    pt += imgoffset;

//    CV_Assert( (unsigned)pt.x <= (unsigned)(grad.cols - blockSize.width) &&
//        (unsigned)pt.y <= (unsigned)(grad.rows - blockSize.height) );

    if( useCache )
    {
        CV_Assert( pt.x % cacheStride.width == 0 &&
                   pt.y % cacheStride.height == 0 );
        Point cacheIdx(pt.x/cacheStride.width,
                       (pt.y/cacheStride.height) % blockCache.rows);
        if( pt.y != ymaxCached[cacheIdx.y] )
        {
            Mat_<uchar> cacheRow = blockCacheFlags.row(cacheIdx.y);
            cacheRow = (uchar)0;
            ymaxCached[cacheIdx.y] = pt.y;
        }

        blockHist = &blockCache[cacheIdx.y][cacheIdx.x*blockHistogramSize];
        uchar& computedFlag = blockCacheFlags(cacheIdx.y, cacheIdx.x);
        if( computedFlag != 0 )
            return blockHist;
        computedFlag = (uchar)1; // set it at once, before actual computing
    }

    int k, C1 = count1, C2 = count2, C4 = count4;
    const float* gradPtr = grad.ptr<float>(pt.y) + pt.x*2;
    const uchar* qanglePtr = qangle.ptr(pt.y) + pt.x*2;

//    CV_Assert( blockHist != 0 );
    memset(blockHist, 0, sizeof(float) * blockHistogramSize);

    const PixData* _pixData = &pixData[0];

    for( k = 0; k < C1; k++ )
    {
        const PixData& pk = _pixData[k];
        const float* const a = gradPtr + pk.gradOfs;
        float w = pk.gradWeight*pk.histWeights[0];
        const uchar* h = qanglePtr + pk.qangleOfs;
        int h0 = h[0], h1 = h[1];

        float* hist = blockHist + pk.histOfs[0];
        float t0 = hist[h0] + a[0]*w;
        float t1 = hist[h1] + a[1]*w;
        hist[h0] = t0; hist[h1] = t1;
    }

#if CV_SSE2
    float hist0[4], hist1[4];
    for( ; k < C2; k++ )
    {
        const PixData& pk = _pixData[k];
        const float* const a = gradPtr + pk.gradOfs;
        const uchar* const h = qanglePtr + pk.qangleOfs;
        int h0 = h[0], h1 = h[1];

        __m128 _a0 = _mm_set1_ps(a[0]), _a1 = _mm_set1_ps(a[1]);
        __m128 _w = _mm_mul_ps(_mm_set1_ps(pk.gradWeight), _mm_loadu_ps(pk.histWeights));
        __m128 _t0 = _mm_mul_ps(_a0, _w), _t1 = _mm_mul_ps(_a1, _w);

        _mm_storeu_ps(hist0, _t0);
        _mm_storeu_ps(hist1, _t1);

        float* hist = blockHist + pk.histOfs[0];
        float t0 = hist[h0] + hist0[0];
        float t1 = hist[h1] + hist1[0];
        hist[h0] = t0; hist[h1] = t1;

        hist = blockHist + pk.histOfs[1];
        t0 = hist[h0] + hist0[1];
        t1 = hist[h1] + hist1[1];
        hist[h0] = t0; hist[h1] = t1;
    }
#elif CV_NEON
    float hist0[4], hist1[4];
    for( ; k < C2; k++ )
    {
        const PixData& pk = _pixData[k];
        const float* const a = gradPtr + pk.gradOfs;
        const uchar* const h = qanglePtr + pk.qangleOfs;
        int h0 = h[0], h1 = h[1];

        float32x4_t _a0 = vdupq_n_f32(a[0]), _a1 = vdupq_n_f32(a[1]);
        float32x4_t _w = vmulq_f32(vdupq_n_f32(pk.gradWeight), vld1q_f32(pk.histWeights));

        float32x4_t _h0 = vsetq_f32((blockHist + pk.histOfs[0])[h0], (blockHist + pk.histOfs[1])[h0], 0,  0);
        float32x4_t _h1 = vsetq_f32((blockHist + pk.histOfs[0])[h1], (blockHist + pk.histOfs[1])[h1], 0,  0);

        float32x4_t _t0 = vmlaq_f32(_h0, _a0, _w), _t1 = vmlaq_f32(_h1, _a1, _w);
        vst1q_f32(hist0, _t0);
        vst1q_f32(hist1, _t1);

        (blockHist + pk.histOfs[0])[h0] = hist0[0];
        (blockHist + pk.histOfs[1])[h0] = hist0[1];

        (blockHist + pk.histOfs[0])[h1] = hist1[0];
        (blockHist + pk.histOfs[1])[h1] = hist1[1];
    }
#else
    for( ; k < C2; k++ )
    {
        const PixData& pk = _pixData[k];
        const float* const a = gradPtr + pk.gradOfs;
        float w, t0, t1, a0 = a[0], a1 = a[1];
        const uchar* const h = qanglePtr + pk.qangleOfs;
        int h0 = h[0], h1 = h[1];

        float* hist = blockHist + pk.histOfs[0];
        w = pk.gradWeight*pk.histWeights[0];
        t0 = hist[h0] + a0*w;
        t1 = hist[h1] + a1*w;
        hist[h0] = t0; hist[h1] = t1;

        hist = blockHist + pk.histOfs[1];
        w = pk.gradWeight*pk.histWeights[1];
        t0 = hist[h0] + a0*w;
        t1 = hist[h1] + a1*w;
        hist[h0] = t0; hist[h1] = t1;
    }
#endif

#if CV_SSE2
    for( ; k < C4; k++ )
    {
        const PixData& pk = _pixData[k];
        const float* const a = gradPtr + pk.gradOfs;
        const uchar* const h = qanglePtr + pk.qangleOfs;
        int h0 = h[0], h1 = h[1];

        __m128 _a0 = _mm_set1_ps(a[0]), _a1 = _mm_set1_ps(a[1]);
        __m128 _w = _mm_mul_ps(_mm_set1_ps(pk.gradWeight), _mm_loadu_ps(pk.histWeights));
        __m128 _t0 = _mm_mul_ps(_a0, _w), _t1 = _mm_mul_ps(_a1, _w);

        _mm_storeu_ps(hist0, _t0);
        _mm_storeu_ps(hist1, _t1);

        float* hist = blockHist + pk.histOfs[0];
        float t0 = hist[h0] + hist0[0];
        float t1 = hist[h1] + hist1[0];
        hist[h0] = t0; hist[h1] = t1;

        hist = blockHist + pk.histOfs[1];
        t0 = hist[h0] + hist0[1];
        t1 = hist[h1] + hist1[1];
        hist[h0] = t0; hist[h1] = t1;

        hist = blockHist + pk.histOfs[2];
        t0 = hist[h0] + hist0[2];
        t1 = hist[h1] + hist1[2];
        hist[h0] = t0; hist[h1] = t1;

        hist = blockHist + pk.histOfs[3];
        t0 = hist[h0] + hist0[3];
        t1 = hist[h1] + hist1[3];
        hist[h0] = t0; hist[h1] = t1;

//        __m128 _hist0 = _mm_set_ps((blockHist + pk.histOfs[3])[h0], (blockHist + pk.histOfs[2])[h0],
//            (blockHist + pk.histOfs[1])[h0], (blockHist + pk.histOfs[0])[h0]);
//        __m128 _hist1 = _mm_set_ps((blockHist + pk.histOfs[3])[h1], (blockHist + pk.histOfs[2])[h1],
//            (blockHist + pk.histOfs[1])[h1], (blockHist + pk.histOfs[0])[h1]);
//
//        _hist0 = _mm_add_ps(_t0, _hist0);
//        _hist1 = _mm_add_ps(_t1, _hist1);
//
//        _mm_storeu_ps(hist0, _hist0);
//        _mm_storeu_ps(hist1, _hist1);
//
//        (pk.histOfs[0] + blockHist)[h0] = hist0[0];
//        (pk.histOfs[1] + blockHist)[h0] = hist0[1];
//        (pk.histOfs[2] + blockHist)[h0] = hist0[2];
//        (pk.histOfs[3] + blockHist)[h0] = hist0[3];
//
//        (pk.histOfs[0] + blockHist)[h1] = hist1[0];
//        (pk.histOfs[1] + blockHist)[h1] = hist1[1];
//        (pk.histOfs[2] + blockHist)[h1] = hist1[2];
//        (pk.histOfs[3] + blockHist)[h1] = hist1[3];
    }
#elif CV_NEON
    for( ; k < C4; k++ )
    {
        const PixData& pk = _pixData[k];
        const float* const a = gradPtr + pk.gradOfs;
        const uchar* const h = qanglePtr + pk.qangleOfs;
        int h0 = h[0], h1 = h[1];

        float32x4_t _a0 = vdupq_n_f32(a[0]), _a1 = vdupq_n_f32(a[1]);
        float32x4_t _w = vmulq_f32(vdupq_n_f32(pk.gradWeight), vld1q_f32(pk.histWeights));

        float32x4_t _h0 = vsetq_f32((blockHist + pk.histOfs[0])[h0],
                                    (blockHist + pk.histOfs[1])[h0],
                                    (blockHist + pk.histOfs[2])[h0],
                                    (blockHist + pk.histOfs[3])[h0]);
        float32x4_t _h1 = vsetq_f32((blockHist + pk.histOfs[0])[h1],
                                    (blockHist + pk.histOfs[1])[h1],
                                    (blockHist + pk.histOfs[2])[h1],
                                    (blockHist + pk.histOfs[3])[h1]);


        float32x4_t _t0 = vmlaq_f32(_h0, _a0, _w), _t1 = vmlaq_f32(_h1, _a1, _w);
        vst1q_f32(hist0, _t0);
        vst1q_f32(hist1, _t1);

        (blockHist + pk.histOfs[0])[h0] = hist0[0];
        (blockHist + pk.histOfs[1])[h0] = hist0[1];
        (blockHist + pk.histOfs[2])[h0] = hist0[2];
        (blockHist + pk.histOfs[3])[h0] = hist0[3];

        (blockHist + pk.histOfs[0])[h1] = hist1[0];
        (blockHist + pk.histOfs[1])[h1] = hist1[1];
        (blockHist + pk.histOfs[2])[h1] = hist1[2];
        (blockHist + pk.histOfs[3])[h1] = hist1[3];
    }
#else
    for( ; k < C4; k++ )
    {
        const PixData& pk = _pixData[k];
        const float* a = gradPtr + pk.gradOfs;
        float w, t0, t1, a0 = a[0], a1 = a[1];
        const uchar* h = qanglePtr + pk.qangleOfs;
        int h0 = h[0], h1 = h[1];

        float* hist = blockHist + pk.histOfs[0];
        w = pk.gradWeight*pk.histWeights[0];
        t0 = hist[h0] + a0*w;
        t1 = hist[h1] + a1*w;
        hist[h0] = t0; hist[h1] = t1;

        hist = blockHist + pk.histOfs[1];
        w = pk.gradWeight*pk.histWeights[1];
        t0 = hist[h0] + a0*w;
        t1 = hist[h1] + a1*w;
        hist[h0] = t0; hist[h1] = t1;

        hist = blockHist + pk.histOfs[2];
        w = pk.gradWeight*pk.histWeights[2];
        t0 = hist[h0] + a0*w;
        t1 = hist[h1] + a1*w;
        hist[h0] = t0; hist[h1] = t1;

        hist = blockHist + pk.histOfs[3];
        w = pk.gradWeight*pk.histWeights[3];
        t0 = hist[h0] + a0*w;
        t1 = hist[h1] + a1*w;
        hist[h0] = t0; hist[h1] = t1;
    }
#endif

    normalizeBlockHistogram(blockHist);

    return blockHist;
}

void HOGCache::normalizeBlockHistogram(float* _hist) const
{
    float* hist = &_hist[0], sum = 0.0f, partSum[4];
    size_t i = 0, sz = blockHistogramSize;

#if CV_SSE2
    __m128 p0 = _mm_loadu_ps(hist);
    __m128 s = _mm_mul_ps(p0, p0);

    for (i = 4; i <= sz - 4; i += 4)
    {
        p0 = _mm_loadu_ps(hist + i);
        s = _mm_add_ps(s, _mm_mul_ps(p0, p0));
    }
    _mm_storeu_ps(partSum, s);
#elif CV_NEON
    float32x4_t p0 = vld1q_f32(hist);
    float32x4_t s = vmulq_f32(p0, p0);

    for (i = 4; i <= sz - 4; i += 4)
    {
        p0 = vld1q_f32(hist + i);
        s = vaddq_f32(s, vmulq_f32(p0, p0));
    }
    vst1q_f32(partSum, s);
#else
    partSum[0] = 0.0f;
    partSum[1] = 0.0f;
    partSum[2] = 0.0f;
    partSum[3] = 0.0f;
    for ( ; i <= sz - 4; i += 4)
    {
        partSum[0] += hist[i] * hist[i];
        partSum[1] += hist[i+1] * hist[i+1];
        partSum[2] += hist[i+2] * hist[i+2];
        partSum[3] += hist[i+3] * hist[i+3];
    }
#endif
    float t0 = partSum[0] + partSum[1];
    float t1 = partSum[2] + partSum[3];
    sum = t0 + t1;
    for ( ; i < sz; ++i)
        sum += hist[i]*hist[i];

    float scale = 1.f/(std::sqrt(sum)+sz*0.1f), thresh = (float)descriptor->L2HysThreshold;
    i = 0, sum = 0.0f;

#if CV_SSE2
    __m128 _scale = _mm_set1_ps(scale);
    static __m128 _threshold = _mm_set1_ps(thresh);

    __m128 p = _mm_mul_ps(_scale, _mm_loadu_ps(hist));
    p = _mm_min_ps(p, _threshold);
    s = _mm_mul_ps(p, p);
    _mm_storeu_ps(hist, p);

    for(i = 4 ; i <= sz - 4; i += 4)
    {
        p = _mm_loadu_ps(hist + i);
        p = _mm_mul_ps(p, _scale);
        p = _mm_min_ps(p, _threshold);
        s = _mm_add_ps(s, _mm_mul_ps(p, p));
        _mm_storeu_ps(hist + i, p);
    }

    _mm_storeu_ps(partSum, s);
#elif CV_NEON
    float32x4_t _scale = vdupq_n_f32(scale);
    static float32x4_t _threshold = vdupq_n_f32(thresh);

    float32x4_t p = vmulq_f32(_scale, vld1q_f32(hist));
    p = vminq_f32(p, _threshold);
    s = vmulq_f32(p, p);
    vst1q_f32(hist, p);

    for(i = 4 ; i <= sz - 4; i += 4)
    {
        p = vld1q_f32(hist + i);
        p = vmulq_f32(p, _scale);
        p = vminq_f32(p, _threshold);
        s = vaddq_f32(s, vmulq_f32(p, p));
        vst1q_f32(hist + i, p);
    }

    vst1q_f32(partSum, s);
#else
    partSum[0] = 0.0f;
    partSum[1] = 0.0f;
    partSum[2] = 0.0f;
    partSum[3] = 0.0f;
    for( ; i <= sz - 4; i += 4)
    {
        hist[i] = std::min(hist[i]*scale, thresh);
        hist[i+1] = std::min(hist[i+1]*scale, thresh);
        hist[i+2] = std::min(hist[i+2]*scale, thresh);
        hist[i+3] = std::min(hist[i+3]*scale, thresh);
        partSum[0] += hist[i]*hist[i];
        partSum[1] += hist[i+1]*hist[i+1];
        partSum[2] += hist[i+2]*hist[i+2];
        partSum[3] += hist[i+3]*hist[i+3];
    }
#endif
    t0 = partSum[0] + partSum[1];
    t1 = partSum[2] + partSum[3];
    sum = t0 + t1;
    for( ; i < sz; ++i)
    {
        hist[i] = std::min(hist[i]*scale, thresh);
        sum += hist[i]*hist[i];
    }

    scale = 1.f/(std::sqrt(sum)+1e-3f), i = 0;
#if CV_SSE2
    __m128 _scale2 = _mm_set1_ps(scale);
    for ( ; i <= sz - 4; i += 4)
    {
        __m128 t = _mm_mul_ps(_scale2, _mm_loadu_ps(hist + i));
        _mm_storeu_ps(hist + i, t);
    }
#elif CV_NEON
    float32x4_t _scale2 = vdupq_n_f32(scale);
    for ( ; i <= sz - 4; i += 4)
    {
        float32x4_t t = vmulq_f32(_scale2, vld1q_f32(hist + i));
        vst1q_f32(hist + i, t);
    }
#endif
    for ( ; i < sz; ++i)
        hist[i] *= scale;
}

Size HOGCache::windowsInImage(const Size& imageSize, const Size& winStride) const
{
    return Size((imageSize.width - winSize.width)/winStride.width + 1,
        (imageSize.height - winSize.height)/winStride.height + 1);
}

Rect HOGCache::getWindow(const Size& imageSize, const Size& winStride, int idx) const
{
    int nwindowsX = (imageSize.width - winSize.width)/winStride.width + 1;
    int y = idx / nwindowsX;
    int x = idx - nwindowsX*y;
    return Rect( x*winStride.width, y*winStride.height, winSize.width, winSize.height );
}

static inline int gcd(int a, int b)
{
    if( a < b )
        std::swap(a, b);
    while( b > 0 )
    {
        int r = a % b;
        a = b;
        b = r;
    }
    return a;
}

#ifdef HAVE_OPENCL

static bool ocl_compute_gradients_8UC1(int height, int width, InputArray _img, float angle_scale,
                                       UMat grad, UMat qangle, bool correct_gamma, int nbins)
{
    ocl::Kernel k("compute_gradients_8UC1_kernel", ocl::objdetect::objdetect_hog_oclsrc);
    if(k.empty())
        return false;

    UMat img = _img.getUMat();

    size_t localThreads[3] = { NTHREADS, 1, 1 };
    size_t globalThreads[3] = { (size_t)width, (size_t)height, 1 };
    char correctGamma = (correct_gamma) ? 1 : 0;
    int grad_quadstep = (int)grad.step >> 3;
    int qangle_elem_size = CV_ELEM_SIZE1(qangle.type());
    int qangle_step = (int)qangle.step / (2 * qangle_elem_size);

    int idx = 0;
    idx = k.set(idx, height);
    idx = k.set(idx, width);
    idx = k.set(idx, (int)img.step1());
    idx = k.set(idx, grad_quadstep);
    idx = k.set(idx, qangle_step);
    idx = k.set(idx, ocl::KernelArg::PtrReadOnly(img));
    idx = k.set(idx, ocl::KernelArg::PtrWriteOnly(grad));
    idx = k.set(idx, ocl::KernelArg::PtrWriteOnly(qangle));
    idx = k.set(idx, angle_scale);
    idx = k.set(idx, correctGamma);
    idx = k.set(idx, nbins);

    return k.run(2, globalThreads, localThreads, false);
}

static bool ocl_computeGradient(InputArray img, UMat grad, UMat qangle, int nbins, Size effect_size, bool gamma_correction, bool signedGradient)
{
    float angleScale = signedGradient ? (float)(nbins/(2.0*CV_PI)) : (float)(nbins/CV_PI);

    return ocl_compute_gradients_8UC1(effect_size.height, effect_size.width, img,
         angleScale, grad, qangle, gamma_correction, nbins);
}

#define CELL_WIDTH 8
#define CELL_HEIGHT 8
#define CELLS_PER_BLOCK_X 2
#define CELLS_PER_BLOCK_Y 2

static bool ocl_compute_hists(int nbins, int block_stride_x, int block_stride_y, int height, int width,
                              UMat grad, UMat qangle, UMat gauss_w_lut, UMat block_hists, size_t block_hist_size)
{
    ocl::Kernel k("compute_hists_lut_kernel", ocl::objdetect::objdetect_hog_oclsrc);
    if(k.empty())
        return false;
    bool is_cpu = cv::ocl::Device::getDefault().type() == cv::ocl::Device::TYPE_CPU;
    cv::String opts;
    if(is_cpu)
       opts = "-D CPU ";
    else
        opts = cv::format("-D WAVE_SIZE=%zu", k.preferedWorkGroupSizeMultiple());
    k.create("compute_hists_lut_kernel", ocl::objdetect::objdetect_hog_oclsrc, opts);
    if(k.empty())
        return false;

    int img_block_width = (width - CELLS_PER_BLOCK_X * CELL_WIDTH + block_stride_x)/block_stride_x;
    int img_block_height = (height - CELLS_PER_BLOCK_Y * CELL_HEIGHT + block_stride_y)/block_stride_y;
    int blocks_total = img_block_width * img_block_height;

    int qangle_elem_size = CV_ELEM_SIZE1(qangle.type());
    int grad_quadstep = (int)grad.step >> 2;
    int qangle_step = (int)qangle.step / qangle_elem_size;

    int blocks_in_group = 4;
    size_t localThreads[3] = { (size_t)blocks_in_group * 24, 2, 1 };
    size_t globalThreads[3] = {((img_block_width * img_block_height + blocks_in_group - 1)/blocks_in_group) * localThreads[0], 2, 1 };

    int hists_size = (nbins * CELLS_PER_BLOCK_X * CELLS_PER_BLOCK_Y * 12) * sizeof(float);
    int final_hists_size = (nbins * CELLS_PER_BLOCK_X * CELLS_PER_BLOCK_Y) * sizeof(float);

    int smem = (hists_size + final_hists_size) * blocks_in_group;

    int idx = 0;
    idx = k.set(idx, block_stride_x);
    idx = k.set(idx, block_stride_y);
    idx = k.set(idx, nbins);
    idx = k.set(idx, (int)block_hist_size);
    idx = k.set(idx, img_block_width);
    idx = k.set(idx, blocks_in_group);
    idx = k.set(idx, blocks_total);
    idx = k.set(idx, grad_quadstep);
    idx = k.set(idx, qangle_step);
    idx = k.set(idx, ocl::KernelArg::PtrReadOnly(grad));
    idx = k.set(idx, ocl::KernelArg::PtrReadOnly(qangle));
    idx = k.set(idx, ocl::KernelArg::PtrReadOnly(gauss_w_lut));
    idx = k.set(idx, ocl::KernelArg::PtrWriteOnly(block_hists));
    idx = k.set(idx, (void*)NULL, (size_t)smem);

    return k.run(2, globalThreads, localThreads, false);
}

static int power_2up(unsigned int n)
{
    for(unsigned int i = 1; i<=1024; i<<=1)
        if(n < i)
            return i;
    return -1; // Input is too big
}

static bool ocl_normalize_hists(int nbins, int block_stride_x, int block_stride_y,
                                int height, int width, UMat block_hists, float threshold)
{
    int block_hist_size = nbins * CELLS_PER_BLOCK_X * CELLS_PER_BLOCK_Y;
    int img_block_width = (width - CELLS_PER_BLOCK_X * CELL_WIDTH + block_stride_x)
        / block_stride_x;
    int img_block_height = (height - CELLS_PER_BLOCK_Y * CELL_HEIGHT + block_stride_y)
        / block_stride_y;
    int nthreads;
    size_t globalThreads[3] = { 1, 1, 1  };
    size_t localThreads[3] = { 1, 1, 1  };

    int idx = 0;
    bool is_cpu = cv::ocl::Device::getDefault().type() == cv::ocl::Device::TYPE_CPU;
    cv::String opts;
    ocl::Kernel k;
    if ( nbins == 9 )
    {
        k.create("normalize_hists_36_kernel", ocl::objdetect::objdetect_hog_oclsrc, "");
        if(k.empty())
            return false;
        if(is_cpu)
           opts = "-D CPU ";
        else
            opts = cv::format("-D WAVE_SIZE=%zu", k.preferedWorkGroupSizeMultiple());
        k.create("normalize_hists_36_kernel", ocl::objdetect::objdetect_hog_oclsrc, opts);
        if(k.empty())
            return false;

        int blocks_in_group = NTHREADS / block_hist_size;
        nthreads = blocks_in_group * block_hist_size;
        int num_groups = (img_block_width * img_block_height + blocks_in_group - 1)/blocks_in_group;
        globalThreads[0] = nthreads * num_groups;
        localThreads[0] = nthreads;
    }
    else
    {
        k.create("normalize_hists_kernel", ocl::objdetect::objdetect_hog_oclsrc, "-D WAVE_SIZE=32");
        if(k.empty())
            return false;
        if(is_cpu)
           opts = "-D CPU ";
        else
            opts = cv::format("-D WAVE_SIZE=%zu", k.preferedWorkGroupSizeMultiple());
        k.create("normalize_hists_kernel", ocl::objdetect::objdetect_hog_oclsrc, opts);
        if(k.empty())
            return false;

        nthreads = power_2up(block_hist_size);
        globalThreads[0] = img_block_width * nthreads;
        globalThreads[1] = img_block_height;
        localThreads[0] = nthreads;

        if ((nthreads < 32) || (nthreads > 512) )
            return false;

        idx = k.set(idx, nthreads);
        idx = k.set(idx, block_hist_size);
        idx = k.set(idx, img_block_width);
    }
    idx = k.set(idx, ocl::KernelArg::PtrReadWrite(block_hists));
    idx = k.set(idx, threshold);
    idx = k.set(idx, (void*)NULL,  nthreads * sizeof(float));

    return k.run(2, globalThreads, localThreads, false);
}

static bool ocl_extract_descrs_by_rows(int win_height, int win_width, int block_stride_y, int block_stride_x, int win_stride_y, int win_stride_x,
                                       int height, int width, UMat block_hists, UMat descriptors,
                                       int block_hist_size, int descr_size, int descr_width)
{
    ocl::Kernel k("extract_descrs_by_rows_kernel", ocl::objdetect::objdetect_hog_oclsrc);
    if(k.empty())
        return false;

    int win_block_stride_x = win_stride_x / block_stride_x;
    int win_block_stride_y = win_stride_y / block_stride_y;
    int img_win_width = (width - win_width + win_stride_x) / win_stride_x;
    int img_win_height = (height - win_height + win_stride_y) / win_stride_y;
    int img_block_width = (width - CELLS_PER_BLOCK_X * CELL_WIDTH + block_stride_x) /
        block_stride_x;

    int descriptors_quadstep = (int)descriptors.step >> 2;

    size_t globalThreads[3] = { (size_t)img_win_width * NTHREADS, (size_t)img_win_height, 1 };
    size_t localThreads[3] = { NTHREADS, 1, 1 };

    int idx = 0;
    idx = k.set(idx, block_hist_size);
    idx = k.set(idx, descriptors_quadstep);
    idx = k.set(idx, descr_size);
    idx = k.set(idx, descr_width);
    idx = k.set(idx, img_block_width);
    idx = k.set(idx, win_block_stride_x);
    idx = k.set(idx, win_block_stride_y);
    idx = k.set(idx, ocl::KernelArg::PtrReadOnly(block_hists));
    idx = k.set(idx, ocl::KernelArg::PtrWriteOnly(descriptors));

    return k.run(2, globalThreads, localThreads, false);
}

static bool ocl_extract_descrs_by_cols(int win_height, int win_width, int block_stride_y, int block_stride_x, int win_stride_y, int win_stride_x,
                                       int height, int width, UMat block_hists, UMat descriptors,
                                       int block_hist_size, int descr_size, int nblocks_win_x, int nblocks_win_y)
{
    ocl::Kernel k("extract_descrs_by_cols_kernel", ocl::objdetect::objdetect_hog_oclsrc);
    if(k.empty())
        return false;

    int win_block_stride_x = win_stride_x / block_stride_x;
    int win_block_stride_y = win_stride_y / block_stride_y;
    int img_win_width = (width - win_width + win_stride_x) / win_stride_x;
    int img_win_height = (height - win_height + win_stride_y) / win_stride_y;
    int img_block_width = (width - CELLS_PER_BLOCK_X * CELL_WIDTH + block_stride_x) /
        block_stride_x;

    int descriptors_quadstep = (int)descriptors.step >> 2;

    size_t globalThreads[3] = { (size_t)img_win_width * NTHREADS, (size_t)img_win_height, 1 };
    size_t localThreads[3] = { NTHREADS, 1, 1 };

    int idx = 0;
    idx = k.set(idx, block_hist_size);
    idx = k.set(idx, descriptors_quadstep);
    idx = k.set(idx, descr_size);
    idx = k.set(idx, nblocks_win_x);
    idx = k.set(idx, nblocks_win_y);
    idx = k.set(idx, img_block_width);
    idx = k.set(idx, win_block_stride_x);
    idx = k.set(idx, win_block_stride_y);
    idx = k.set(idx, ocl::KernelArg::PtrReadOnly(block_hists));
    idx = k.set(idx, ocl::KernelArg::PtrWriteOnly(descriptors));

    return k.run(2, globalThreads, localThreads, false);
}

static bool ocl_compute(InputArray _img, Size win_stride, std::vector<float>& _descriptors, HOGDescriptor::DescriptorStorageFormat descr_format, Size blockSize,
                        Size cellSize, int nbins, Size blockStride, Size winSize, float sigma, bool gammaCorrection, double L2HysThreshold, bool signedGradient)
{
    Size imgSize = _img.size();
    Size effect_size = imgSize;

    UMat grad(imgSize, CV_32FC2);
    int qangle_type = ocl::Device::getDefault().isIntel() ? CV_32SC2 : CV_8UC2;
    UMat qangle(imgSize, qangle_type);

    const size_t block_hist_size = getBlockHistogramSize(blockSize, cellSize, nbins);
    const Size blocks_per_img = numPartsWithin(imgSize, blockSize, blockStride);
    UMat block_hists(1, static_cast<int>(block_hist_size * blocks_per_img.area()) + 256, CV_32F);

    Size wins_per_img = numPartsWithin(imgSize, winSize, win_stride);
    UMat labels(1, wins_per_img.area(), CV_8U);

    float scale = 1.f / (2.f * sigma * sigma);
    Mat gaussian_lut(1, 512, CV_32FC1);
    int idx = 0;
    for(int i=-8; i<8; i++)
        for(int j=-8; j<8; j++)
            gaussian_lut.at<float>(idx++) = std::exp(-(j * j + i * i) * scale);
    for(int i=-8; i<8; i++)
        for(int j=-8; j<8; j++)
            gaussian_lut.at<float>(idx++) = (8.f - fabs(j + 0.5f)) * (8.f - fabs(i + 0.5f)) / 64.f;

    if(!ocl_computeGradient(_img, grad, qangle, nbins, effect_size, gammaCorrection, signedGradient))
        return false;

    UMat gauss_w_lut;
    gaussian_lut.copyTo(gauss_w_lut);
    if(!ocl_compute_hists(nbins, blockStride.width, blockStride.height, effect_size.height,
        effect_size.width, grad, qangle, gauss_w_lut, block_hists, block_hist_size))
        return false;

    if(!ocl_normalize_hists(nbins, blockStride.width, blockStride.height, effect_size.height,
        effect_size.width, block_hists, (float)L2HysThreshold))
        return false;

    Size blocks_per_win = numPartsWithin(winSize, blockSize, blockStride);
    wins_per_img = numPartsWithin(effect_size, winSize, win_stride);

    int descr_size = blocks_per_win.area()*(int)block_hist_size;
    int descr_width = (int)block_hist_size*blocks_per_win.width;

    UMat descriptors(wins_per_img.area(), static_cast<int>(blocks_per_win.area() * block_hist_size), CV_32F);
    switch (descr_format)
    {
    case HOGDescriptor::DESCR_FORMAT_ROW_BY_ROW:
        if(!ocl_extract_descrs_by_rows(winSize.height, winSize.width,
            blockStride.height, blockStride.width, win_stride.height, win_stride.width, effect_size.height,
            effect_size.width, block_hists, descriptors, (int)block_hist_size, descr_size, descr_width))
            return false;
        break;
    case HOGDescriptor::DESCR_FORMAT_COL_BY_COL:
        if(!ocl_extract_descrs_by_cols(winSize.height, winSize.width,
            blockStride.height, blockStride.width, win_stride.height, win_stride.width, effect_size.height, effect_size.width,
            block_hists, descriptors, (int)block_hist_size, descr_size, blocks_per_win.width, blocks_per_win.height))
            return false;
        break;
    default:
        return false;
    }
    descriptors.reshape(1, (int)descriptors.total()).getMat(ACCESS_READ).copyTo(_descriptors);
    return true;
}
#endif //HAVE_OPENCL

void HOGDescriptor::compute(InputArray _img, std::vector<float>& descriptors,
    Size winStride, Size padding, const std::vector<Point>& locations) const
{
    CV_INSTRUMENT_REGION();

    if( winStride == Size() )
        winStride = cellSize;
    Size cacheStride(gcd(winStride.width, blockStride.width),
                     gcd(winStride.height, blockStride.height));

    Size imgSize = _img.size();

    size_t nwindows = locations.size();
    padding.width = (int)alignSize(std::max(padding.width, 0), cacheStride.width);
    padding.height = (int)alignSize(std::max(padding.height, 0), cacheStride.height);
    Size paddedImgSize(imgSize.width + padding.width*2, imgSize.height + padding.height*2);

    CV_OCL_RUN(_img.dims() <= 2 && _img.type() == CV_8UC1 && _img.isUMat(),
        ocl_compute(_img, winStride, descriptors, HOGDescriptor::DESCR_FORMAT_COL_BY_COL, blockSize,
        cellSize, nbins, blockStride, winSize, (float)getWinSigma(), gammaCorrection, L2HysThreshold, signedGradient))

    Mat img = _img.getMat();
    HOGCache cache(this, img, padding, padding, nwindows == 0, cacheStride);

    if( !nwindows )
        nwindows = cache.windowsInImage(paddedImgSize, winStride).area();

    const HOGCache::BlockData* blockData = &cache.blockData[0];

    int nblocks = cache.nblocks.area();
    int blockHistogramSize = cache.blockHistogramSize;
    size_t dsize = getDescriptorSize();
    descriptors.resize(dsize*nwindows);

    // for each window
    for( size_t i = 0; i < nwindows; i++ )
    {
        float* descriptor = &descriptors[i*dsize];

        Point pt0;
        if( !locations.empty() )
        {
            pt0 = locations[i];
            if( pt0.x < -padding.width || pt0.x > img.cols + padding.width - winSize.width ||
                pt0.y < -padding.height || pt0.y > img.rows + padding.height - winSize.height )
                continue;
        }
        else
        {
            pt0 = cache.getWindow(paddedImgSize, winStride, (int)i).tl() - Point(padding);
//            CV_Assert(pt0.x % cacheStride.width == 0 && pt0.y % cacheStride.height == 0);
        }

        for( int j = 0; j < nblocks; j++ )
        {
            const HOGCache::BlockData& bj = blockData[j];
            Point pt = pt0 + bj.imgOffset;

            float* dst = descriptor + bj.histOfs;
            const float* src = cache.getBlock(pt, dst);
            if( src != dst )
                memcpy(dst, src, blockHistogramSize * sizeof(float));
        }
    }
}

void HOGDescriptor::detect(InputArray _img,
    std::vector<Point>& hits, std::vector<double>& weights, double hitThreshold,
    Size winStride, Size padding, const std::vector<Point>& locations) const
{
    CV_INSTRUMENT_REGION();

    Mat img = _img.getMat();
    hits.clear();
    weights.clear();
    if( svmDetector.empty() )
        return;

    if( winStride == Size() )
        winStride = cellSize;
    Size cacheStride(gcd(winStride.width, blockStride.width),
        gcd(winStride.height, blockStride.height));

    size_t nwindows = locations.size();
    padding.width = (int)alignSize(std::max(padding.width, 0), cacheStride.width);
    padding.height = (int)alignSize(std::max(padding.height, 0), cacheStride.height);
    Size paddedImgSize(img.cols + padding.width*2, img.rows + padding.height*2);

    HOGCache cache(this, img, padding, padding, nwindows == 0, cacheStride);

    if( !nwindows )
        nwindows = cache.windowsInImage(paddedImgSize, winStride).area();

    const HOGCache::BlockData* blockData = &cache.blockData[0];

    int nblocks = cache.nblocks.area();
    int blockHistogramSize = cache.blockHistogramSize;
    size_t dsize = getDescriptorSize();

    double rho = svmDetector.size() > dsize ? svmDetector[dsize] : 0;
    std::vector<float> blockHist(blockHistogramSize);

#if CV_SSE2 || CV_NEON
    float partSum[4];
#endif

    for( size_t i = 0; i < nwindows; i++ )
    {
        Point pt0;
        if( !locations.empty() )
        {
            pt0 = locations[i];
            if( pt0.x < -padding.width || pt0.x > img.cols + padding.width - winSize.width ||
                    pt0.y < -padding.height || pt0.y > img.rows + padding.height - winSize.height )
                continue;
        }
        else
        {
            pt0 = cache.getWindow(paddedImgSize, winStride, (int)i).tl() - Point(padding);
            CV_Assert(pt0.x % cacheStride.width == 0 && pt0.y % cacheStride.height == 0);
        }
        double s = rho;
        const float* svmVec = &svmDetector[0];

        int j, k;
        for( j = 0; j < nblocks; j++, svmVec += blockHistogramSize )
        {
            const HOGCache::BlockData& bj = blockData[j];
            Point pt = pt0 + bj.imgOffset;

            const float* vec = cache.getBlock(pt, &blockHist[0]);
#if CV_SSE2
            __m128 _vec = _mm_loadu_ps(vec);
            __m128 _svmVec = _mm_loadu_ps(svmVec);
            __m128 sum = _mm_mul_ps(_svmVec, _vec);

            for( k = 4; k <= blockHistogramSize - 4; k += 4 )
            {
                _vec = _mm_loadu_ps(vec + k);
                _svmVec = _mm_loadu_ps(svmVec + k);

                sum = _mm_add_ps(sum, _mm_mul_ps(_vec, _svmVec));
            }

            _mm_storeu_ps(partSum, sum);
            double t0 = partSum[0] + partSum[1];
            double t1 = partSum[2] + partSum[3];
            s += t0 + t1;
#elif CV_NEON
            float32x4_t _vec = vld1q_f32(vec);
            float32x4_t _svmVec = vld1q_f32(svmVec);
            float32x4_t sum = vmulq_f32(_svmVec, _vec);

            for( k = 4; k <= blockHistogramSize - 4; k += 4 )
            {
                _vec = vld1q_f32(vec + k);
                _svmVec = vld1q_f32(svmVec + k);

                sum = vaddq_f32(sum, vmulq_f32(_vec, _svmVec));
            }

            vst1q_f32(partSum, sum);
            double t0 = partSum[0] + partSum[1];
            double t1 = partSum[2] + partSum[3];
            s += t0 + t1;
#else
            for( k = 0; k <= blockHistogramSize - 4; k += 4 )
                s += vec[k]*svmVec[k] + vec[k+1]*svmVec[k+1] +
                    vec[k+2]*svmVec[k+2] + vec[k+3]*svmVec[k+3];
#endif
            for( ; k < blockHistogramSize; k++ )
                s += vec[k]*svmVec[k];
        }
        if( s >= hitThreshold )
        {
            hits.push_back(pt0);
            weights.push_back(s);
        }
    }
}

void HOGDescriptor::detect(InputArray img, std::vector<Point>& hits, double hitThreshold,
    Size winStride, Size padding, const std::vector<Point>& locations) const
{
    CV_INSTRUMENT_REGION();

    std::vector<double> weightsV;
    detect(img, hits, weightsV, hitThreshold, winStride, padding, locations);
}

class HOGInvoker :
    public ParallelLoopBody
{
public:
    HOGInvoker( const HOGDescriptor* _hog, const Mat& _img,
        double _hitThreshold, const Size& _winStride, const Size& _padding,
        const double* _levelScale, std::vector<Rect> * _vec, Mutex* _mtx,
        std::vector<double>* _weights=0, std::vector<double>* _scales=0 )
    {
        hog = _hog;
        img = _img;
        hitThreshold = _hitThreshold;
        winStride = _winStride;
        padding = _padding;
        levelScale = _levelScale;
        vec = _vec;
        weights = _weights;
        scales = _scales;
        mtx = _mtx;
    }

    void operator()(const Range& range) const CV_OVERRIDE
    {
        int i, i1 = range.start, i2 = range.end;
        double minScale = i1 > 0 ? levelScale[i1] : i2 > 1 ? levelScale[i1+1] : std::max(img.cols, img.rows);
        Size maxSz(cvCeil(img.cols/minScale), cvCeil(img.rows/minScale));
        Mat smallerImgBuf(maxSz, img.type());
        std::vector<Point> locations;
        std::vector<double> hitsWeights;

        for( i = i1; i < i2; i++ )
        {
            double scale = levelScale[i];
            Size sz(cvRound(img.cols/scale), cvRound(img.rows/scale));
            Mat smallerImg(sz, img.type(), smallerImgBuf.ptr());
            if( sz == img.size() )
                smallerImg = Mat(sz, img.type(), img.data, img.step);
            else
                resize(img, smallerImg, sz, 0, 0, INTER_LINEAR_EXACT);
            hog->detect(smallerImg, locations, hitsWeights, hitThreshold, winStride, padding);
            Size scaledWinSize = Size(cvRound(hog->winSize.width*scale), cvRound(hog->winSize.height*scale));

            mtx->lock();
            for( size_t j = 0; j < locations.size(); j++ )
            {
                vec->push_back(Rect(cvRound(locations[j].x*scale),
                                    cvRound(locations[j].y*scale),
                                    scaledWinSize.width, scaledWinSize.height));
                if (scales)
                    scales->push_back(scale);
            }
            mtx->unlock();

            if (weights && (!hitsWeights.empty()))
            {
                mtx->lock();
                for (size_t j = 0; j < locations.size(); j++)
                    weights->push_back(hitsWeights[j]);
                mtx->unlock();
            }
        }
    }

private:
    const HOGDescriptor* hog;
    Mat img;
    double hitThreshold;
    Size winStride;
    Size padding;
    const double* levelScale;
    std::vector<Rect>* vec;
    std::vector<double>* weights;
    std::vector<double>* scales;
    Mutex* mtx;
};

#ifdef HAVE_OPENCL

static bool ocl_classify_hists(int win_height, int win_width, int block_stride_y, int block_stride_x,
                               int win_stride_y, int win_stride_x, int height, int width,
                               const UMat& block_hists, UMat detector,
                               float free_coef, float threshold, UMat& labels, Size descr_size, int block_hist_size)
{
    int nthreads;
    bool is_cpu = cv::ocl::Device::getDefault().type() == cv::ocl::Device::TYPE_CPU;
    cv::String opts;

    ocl::Kernel k;
    int idx = 0;
    switch (descr_size.width)
    {
    case 180:
        nthreads = 180;
        k.create("classify_hists_180_kernel", ocl::objdetect::objdetect_hog_oclsrc, "-D WAVE_SIZE=32");
        if(k.empty())
            return false;
        if(is_cpu)
           opts = "-D CPU ";
        else
            opts = cv::format("-D WAVE_SIZE=%zu", k.preferedWorkGroupSizeMultiple());
        k.create("classify_hists_180_kernel", ocl::objdetect::objdetect_hog_oclsrc, opts);
        if(k.empty())
            return false;
        idx = k.set(idx, descr_size.width);
        idx = k.set(idx, descr_size.height);
        break;

    case 252:
        nthreads = 256;
        k.create("classify_hists_252_kernel", ocl::objdetect::objdetect_hog_oclsrc, "-D WAVE_SIZE=32");
        if(k.empty())
            return false;
        if(is_cpu)
           opts = "-D CPU ";
        else
            opts = cv::format("-D WAVE_SIZE=%zu", k.preferedWorkGroupSizeMultiple());
        k.create("classify_hists_252_kernel", ocl::objdetect::objdetect_hog_oclsrc, opts);
        if(k.empty())
            return false;
        idx = k.set(idx, descr_size.width);
        idx = k.set(idx, descr_size.height);
        break;

    default:
        nthreads = 256;
        k.create("classify_hists_kernel", ocl::objdetect::objdetect_hog_oclsrc, "-D WAVE_SIZE=32");
        if(k.empty())
            return false;
        if(is_cpu)
           opts = "-D CPU ";
        else
            opts = cv::format("-D WAVE_SIZE=%zu", k.preferedWorkGroupSizeMultiple());
        k.create("classify_hists_kernel", ocl::objdetect::objdetect_hog_oclsrc, opts);
        if(k.empty())
            return false;
        idx = k.set(idx, descr_size.area());
        idx = k.set(idx, descr_size.height);
    }

    int win_block_stride_x = win_stride_x / block_stride_x;
    int win_block_stride_y = win_stride_y / block_stride_y;
    int img_win_width = (width - win_width + win_stride_x) / win_stride_x;
    int img_win_height = (height - win_height + win_stride_y) / win_stride_y;
    int img_block_width = (width - CELLS_PER_BLOCK_X * CELL_WIDTH + block_stride_x) /
        block_stride_x;

    size_t globalThreads[3] = { (size_t)img_win_width * nthreads, (size_t)img_win_height, 1 };
    size_t localThreads[3] = { (size_t)nthreads, 1, 1 };

    idx = k.set(idx, block_hist_size);
    idx = k.set(idx, img_win_width);
    idx = k.set(idx, img_block_width);
    idx = k.set(idx, win_block_stride_x);
    idx = k.set(idx, win_block_stride_y);
    idx = k.set(idx, ocl::KernelArg::PtrReadOnly(block_hists));
    idx = k.set(idx, ocl::KernelArg::PtrReadOnly(detector));
    idx = k.set(idx, free_coef);
    idx = k.set(idx, threshold);
    idx = k.set(idx, ocl::KernelArg::PtrWriteOnly(labels));

    return k.run(2, globalThreads, localThreads, false);
}

static bool ocl_detect(InputArray img, std::vector<Point> &hits, double hit_threshold, Size win_stride,
                       const UMat& oclSvmDetector, Size blockSize, Size cellSize, int nbins, Size blockStride, Size winSize,
                       bool gammaCorrection, double L2HysThreshold, float sigma, float free_coef, bool signedGradient)
{
    hits.clear();
    if (oclSvmDetector.empty())
        return false;

    Size imgSize = img.size();
    Size effect_size = imgSize;
    UMat grad(imgSize, CV_32FC2);
    int qangle_type = ocl::Device::getDefault().isIntel() ? CV_32SC2 : CV_8UC2;
    UMat qangle(imgSize, qangle_type);

    const size_t block_hist_size = getBlockHistogramSize(blockSize, cellSize, nbins);
    const Size blocks_per_img = numPartsWithin(imgSize, blockSize, blockStride);
    UMat block_hists(1, static_cast<int>(block_hist_size * blocks_per_img.area()) + 256, CV_32F);

    Size wins_per_img = numPartsWithin(imgSize, winSize, win_stride);
    UMat labels(1, wins_per_img.area(), CV_8U);

    float scale = 1.f / (2.f * sigma * sigma);
    Mat gaussian_lut(1, 512, CV_32FC1);
    int idx = 0;
    for(int i=-8; i<8; i++)
        for(int j=-8; j<8; j++)
            gaussian_lut.at<float>(idx++) = std::exp(-(j * j + i * i) * scale);
    for(int i=-8; i<8; i++)
        for(int j=-8; j<8; j++)
            gaussian_lut.at<float>(idx++) = (8.f - fabs(j + 0.5f)) * (8.f - fabs(i + 0.5f)) / 64.f;

    if(!ocl_computeGradient(img, grad, qangle, nbins, effect_size, gammaCorrection, signedGradient))
        return false;

    UMat gauss_w_lut;
    gaussian_lut.copyTo(gauss_w_lut);
    if(!ocl_compute_hists(nbins, blockStride.width, blockStride.height, effect_size.height,
        effect_size.width, grad, qangle, gauss_w_lut, block_hists, block_hist_size))
        return false;

    if(!ocl_normalize_hists(nbins, blockStride.width, blockStride.height, effect_size.height,
        effect_size.width, block_hists, (float)L2HysThreshold))
        return false;

    Size blocks_per_win = numPartsWithin(winSize, blockSize, blockStride);

    Size descr_size((int)block_hist_size*blocks_per_win.width, blocks_per_win.height);

    if(!ocl_classify_hists(winSize.height, winSize.width, blockStride.height,
        blockStride.width, win_stride.height, win_stride.width,
        effect_size.height, effect_size.width, block_hists, oclSvmDetector,
        free_coef, (float)hit_threshold, labels, descr_size, (int)block_hist_size))
        return false;

    Mat labels_host = labels.getMat(ACCESS_READ);
    unsigned char *vec = labels_host.ptr();
    for (int i = 0; i < wins_per_img.area(); i++)
    {
        int y = i / wins_per_img.width;
        int x = i - wins_per_img.width * y;
        if (vec[i])
        {
            hits.push_back(Point(x * win_stride.width, y * win_stride.height));
        }
    }
    return true;
}

static bool ocl_detectMultiScale(InputArray _img, std::vector<Rect> &found_locations, std::vector<double>& level_scale,
                                              double hit_threshold, Size win_stride, double group_threshold,
                                              const UMat& oclSvmDetector, Size blockSize, Size cellSize,
                                              int nbins, Size blockStride, Size winSize, bool gammaCorrection,
                                              double L2HysThreshold, float sigma, float free_coef, bool signedGradient)
{
    std::vector<Rect> all_candidates;
    std::vector<Point> locations;
    UMat image_scale;
    Size imgSize = _img.size();
    image_scale.create(imgSize, _img.type());

    for (size_t i = 0; i<level_scale.size() ; i++)
    {
        double scale = level_scale[i];
        Size effect_size = Size(cvRound(imgSize.width / scale), cvRound(imgSize.height / scale));
        if (effect_size == imgSize)
        {
            if(!ocl_detect(_img, locations, hit_threshold, win_stride, oclSvmDetector, blockSize, cellSize, nbins,
                blockStride, winSize, gammaCorrection, L2HysThreshold, sigma, free_coef, signedGradient))
                return false;
        }
        else
        {
            resize(_img, image_scale, effect_size, 0, 0, INTER_LINEAR_EXACT);
            if(!ocl_detect(image_scale, locations, hit_threshold, win_stride, oclSvmDetector, blockSize, cellSize, nbins,
                blockStride, winSize, gammaCorrection, L2HysThreshold, sigma, free_coef, signedGradient))
                return false;
        }
        Size scaled_win_size(cvRound(winSize.width * scale),
            cvRound(winSize.height * scale));
        for (size_t j = 0; j < locations.size(); j++)
            all_candidates.push_back(Rect(Point2d(locations[j]) * scale, scaled_win_size));
    }
    found_locations.assign(all_candidates.begin(), all_candidates.end());
    groupRectangles(found_locations, (int)group_threshold, 0.2);
    clipObjects(imgSize, found_locations, 0, 0);

    return true;
}
#endif //HAVE_OPENCL

void HOGDescriptor::detectMultiScale(
    InputArray _img, std::vector<Rect>& foundLocations, std::vector<double>& foundWeights,
    double hitThreshold, Size winStride, Size padding,
    double scale0, double finalThreshold, bool useMeanshiftGrouping) const
{
    CV_INSTRUMENT_REGION();

    double scale = 1.;
    int levels = 0;

    Size imgSize = _img.size();
    std::vector<double> levelScale;
    for( levels = 0; levels < nlevels; levels++ )
    {
        levelScale.push_back(scale);
        if( cvRound(imgSize.width/scale) < winSize.width ||
            cvRound(imgSize.height/scale) < winSize.height ||
                scale0 <= 1 )
            break;
        scale *= scale0;
    }
    levels = std::max(levels, 1);
    levelScale.resize(levels);

    if(winStride == Size())
        winStride = blockStride;

    CV_OCL_RUN(_img.dims() <= 2 && _img.type() == CV_8UC1 && scale0 > 1 && winStride.width % blockStride.width == 0 &&
        winStride.height % blockStride.height == 0 && padding == Size(0,0) && _img.isUMat(),
        ocl_detectMultiScale(_img, foundLocations, levelScale, hitThreshold, winStride, finalThreshold, oclSvmDetector,
        blockSize, cellSize, nbins, blockStride, winSize, gammaCorrection, L2HysThreshold, (float)getWinSigma(), free_coef, signedGradient));

    std::vector<Rect> allCandidates;
    std::vector<double> tempScales;
    std::vector<double> tempWeights;
    std::vector<double> foundScales;

    Mutex mtx;
    Mat img = _img.getMat();
    Range range(0, (int)levelScale.size());
    HOGInvoker invoker(this, img, hitThreshold, winStride, padding, &levelScale[0], &allCandidates, &mtx, &tempWeights, &tempScales);
    parallel_for_(range, invoker);

    std::copy(tempScales.begin(), tempScales.end(), back_inserter(foundScales));
    foundLocations.clear();
    std::copy(allCandidates.begin(), allCandidates.end(), back_inserter(foundLocations));
    foundWeights.clear();
    std::copy(tempWeights.begin(), tempWeights.end(), back_inserter(foundWeights));

    if ( useMeanshiftGrouping )
        groupRectangles_meanshift(foundLocations, foundWeights, foundScales, finalThreshold, winSize);
    else
        groupRectangles(foundLocations, foundWeights, (int)finalThreshold, 0.2);
    clipObjects(imgSize, foundLocations, 0, &foundWeights);
}

void HOGDescriptor::detectMultiScale(InputArray img, std::vector<Rect>& foundLocations,
    double hitThreshold, Size winStride, Size padding,
    double scale0, double finalThreshold, bool useMeanshiftGrouping) const
{
    CV_INSTRUMENT_REGION();

    std::vector<double> foundWeights;
    detectMultiScale(img, foundLocations, foundWeights, hitThreshold, winStride,
                padding, scale0, finalThreshold, useMeanshiftGrouping);
}

template<typename _ClsName> struct RTTIImpl
{
public:
    static int isInstance(const void* ptr)
    {
        static _ClsName dummy;
        static void* dummyp = &dummy;
        union
        {
            const void* p;
            const void** pp;
        } a, b;
        a.p = dummyp;
        b.p = ptr;
        return *a.pp == *b.pp;
    }
    static void release(void** dbptr)
    {
        if(dbptr && *dbptr)
        {
            delete (_ClsName*)*dbptr;
            *dbptr = 0;
        }
    }
    static void* read(CvFileStorage* fs, CvFileNode* n)
    {
        FileNode fn(fs, n);
        _ClsName* obj = new _ClsName;
        if(obj->read(fn))
            return obj;
        delete obj;
        return 0;
    }

    static void write(CvFileStorage* _fs, const char* name, const void* ptr, CvAttrList)
    {
        if(ptr && _fs)
        {
            FileStorage fs(_fs, false);
            ((const _ClsName*)ptr)->write(fs, String(name));
        }
    }

    static void* clone(const void* ptr)
    {
        if(!ptr)
            return 0;
        return new _ClsName(*(const _ClsName*)ptr);
    }
};

typedef RTTIImpl<HOGDescriptor> HOGRTTI;

CvType hog_type( CV_TYPE_NAME_HOG_DESCRIPTOR, HOGRTTI::isInstance,
    HOGRTTI::release, HOGRTTI::read, HOGRTTI::write, HOGRTTI::clone);

std::vector<float> HOGDescriptor::getDefaultPeopleDetector()
{
    static const float detector[] = {
        0.05359386f, -0.14721455f, -0.05532170f, 0.05077307f,
        0.11547081f, -0.04268804f, 0.04635834f, -0.05468199f, 0.08232084f,
        0.10424068f, -0.02294518f, 0.01108519f, 0.01378693f, 0.11193510f,
        0.01268418f, 0.08528346f, -0.06309239f, 0.13054633f, 0.08100729f,
        -0.05209739f, -0.04315529f, 0.09341384f, 0.11035026f, -0.07596218f,
        -0.05517511f, -0.04465296f, 0.02947334f, 0.04555536f,
        -3.55954492e-003f, 0.07818956f, 0.07730991f, 0.07890715f, 0.06222893f,
        0.09001380f, -0.03574381f, 0.03414327f, 0.05677258f, -0.04773581f,
        0.03746637f, -0.03521175f, 0.06955440f, -0.03849038f, 0.01052293f,
        0.01736112f, 0.10867710f, 0.08748853f, 3.29739624e-003f, 0.10907028f,
        0.07913758f, 0.10393070f, 0.02091867f, 0.11594022f, 0.13182420f,
        0.09879354f, 0.05362710f, -0.06745391f, -7.01260753e-003f,
        5.24702156e-003f, 0.03236255f, 0.01407916f, 0.02207983f, 0.02537322f,
        0.04547948f, 0.07200756f, 0.03129894f, -0.06274468f, 0.02107014f,
        0.06035208f, 0.08636236f, 4.53164103e-003f, 0.02193363f, 0.02309801f,
        0.05568166f, -0.02645093f, 0.04448695f, 0.02837519f, 0.08975694f,
        0.04461516f, 0.08975355f, 0.07514391f, 0.02306982f, 0.10410084f,
        0.06368385f, 0.05943464f, 4.58420580e-003f, 0.05220337f, 0.06675851f,
        0.08358569f, 0.06712101f, 0.06559004f, -0.03930482f, -9.15936660e-003f,
        -0.05897915f, 0.02816453f, 0.05032348f, 0.06780671f, 0.03377650f,
        -6.09417039e-004f, -0.01795146f, -0.03083684f, -0.01302475f,
        -0.02972313f, 7.88706727e-003f, -0.03525961f, -2.50397739e-003f,
        0.05245084f, 0.11791293f, -0.02167498f, 0.05299332f, 0.06640524f,
        0.05190265f, -8.27316567e-003f, 0.03033127f, 0.05842173f,
        -4.01050318e-003f, -6.25105947e-003f, 0.05862958f, -0.02465461f,
        0.05546781f, -0.08228195f, -0.07234028f, 0.04640540f, -0.01308254f,
        -0.02506191f, 0.03100746f, -0.04665651f, -0.04591486f, 0.02949927f,
        0.06035462f, 0.02244646f, -0.01698639f, 0.01040041f, 0.01131170f,
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        0.12519856f, 4.38762689e-003f, 0.02795992f, 0.05170322f, 0.09223596f,
        0.05890015f, 0.02376701f, -0.02777346f, 0.09506908f, 0.02328936f,
        -0.02319928f, -0.03218696f, -0.01527841f, -0.01016694f, -0.02674719f,
        0.05137179f, 0.01980666f, 0.06544447f, -0.01746171f, 0.01026380f,
        0.01561806f, 7.97004555e-004f, 0.07601810f, 0.01907250f, -0.03083035f,
        -0.05987392f, 0.09242783f, 0.14555025f, 0.01035827f, 0.03092401f,
        -0.09562709f, -0.03802354f, 0.02531144f, 0.03079449f, -0.07100715f,
        0.03330721f, -2.69116857e-003f, 0.03167490f, 0.05744999f, 0.03259895f,
        1.91266940e-003f, 0.03194578f, 0.07389776f, 0.02198060f, 0.07633314f,
        0.03293105f, -0.09103648f, 0.04718142f, 0.06102672f, -0.01003063f,
        5.85481385e-003f, -0.01522574f, 0.02323526f, 0.10584345f,
        4.35879454e-003f, 0.06107873f, 0.05868603f, -0.03115531f, 0.01214679f,
        0.08567052f, 3.93926632e-003f, -0.02521488f, -1.88425183e-003f,
        0.02038053f, -6.26854831e-004f, 0.04897438f, -0.04280585f,
        -0.04819689f, -0.04812867f, -0.01451186f, 0.05101469f,
        -9.01125465e-003f, -0.03333859f, 0.03917955f, 0.04196448f, 0.04292135f,
        0.02809529f, 0.02999715f, 0.04081348f, 9.10039060e-003f, 0.09703232f,
        0.10379741f, 0.02348725f, -4.72756615e-003f, 0.01027325f, 0.10402658f,
        0.12071823f, 0.09817299f, -0.02612033f, 0.03638414f, 0.05896405f,
        0.04865025f, 0.04793910f, -0.03882321f, -0.02962117f, -0.01222268f,
        0.04071597f, 0.01922777f, -0.02287866f, 0.03328381f, 0.01859092f,
        0.09024994f, 0.03804455f, -0.01424510f, 0.01953739f, 0.02509617f,
        -0.03390914f, -0.05663941f, -0.01641979f, 0.05848591f, 0.04639670f,
        0.02092116f, 0.12911791f, 0.19918139f, 0.07739855f, -7.25806039e-003f,
        0.04074838f, 0.03183993f, 1.39251316e-003f, -0.01428625f, 0.01865480f,
        0.08529541f, 0.13547510f, 0.11189661f, 0.03998901f, 0.09575938f,
        -0.02631102f, -0.03458253f, -0.04749985f, -0.06070716f,
        4.71884012e-003f, 0.06445789f, -0.02450038f, -0.05483776f,
        -0.04657237f, -0.02030717f, -0.03480766f, -0.09397731f, -0.06399718f,
        -0.01804585f, 5.62348310e-003f, -6.64811488e-003f, -0.06517869f,
        6.96210237e-003f, -0.01860148f, -0.04245830f, -0.05850367f,
        -3.24417115e-003f, 0.07700698f, 0.11290991f, 0.09923030f, -0.02970599f,
        0.05592411f, 0.04813979f, -0.09811195f, -0.09357996f, -0.03276114f,
        0.05218338f, 0.04141375f, 3.92977800e-003f, -0.05047480f, 0.15960084f,
        0.04612800f, -0.03114098f, -0.04650044f, -0.03249795f, -0.02425641f,
        -0.04311355f, 0.04307659f, -0.09401883f, -0.04742785f, -0.01254499f,
        -0.06598741f, 3.41369561e-003f, -0.05620445f, -7.28127593e-003f,
        -0.05998361f, -0.03274450f, -0.07376868f, 3.19015374e-003f,
        -0.07733069f, 0.05815864f, -0.02471071f, 0.03850617f, 0.13838784f,
        0.15399861f, 0.01731321f, -0.01477586f, 0.10393341f, 0.05159833f,
        -0.01945555f, -0.03427503f, -0.04867341f, 0.09237480f, 0.10732719f,
        0.06071450f, -0.01355071f, 0.01844356f, -0.03480803f, -0.03796671f,
        2.15628621e-004f, -0.05440186f, 0.01889855f, -0.01443413f,
        -0.02607902f, -0.02938001f, 0.02720689f, -0.06228397f, -0.02970936f,
        -0.03426210f, -0.10280876f, -0.06739304f, -0.05227850f, 0.03360292f,
        -0.11278441f, -0.06966180f, -0.13937433f, 9.10932291e-003f,
        2.52020749e-004f, -4.07359656e-003f, 0.12310639f, 0.09343060f,
        0.07302511f, 0.03222093f, 0.07532879f, 0.03792387f, -0.04985180f,
        0.01804602f, 0.02694195f, 0.13481498f, 0.04601225f, 0.04106982f,
        0.08511057f, 0.12314661f, 0.01320830f, 0.05044121f, -5.52943908e-003f,
        -0.08992624f, -0.02249301f, -0.08181777f, 0.06165213f, -0.03256603f,
        -0.01068920f, -0.01323473f, -0.11970232f, -0.04616347f, -0.12088681f,
        -0.06762606f, -0.08676834f, -0.06434575f, 0.01772529f, 0.03469615f,
        -0.10926618f, 0.03013873f, 0.14030397f, 0.16130108f, 0.17985588f,
        0.11281928f, 0.10530639f, 0.08905948f, 0.07733764f, 0.06695238f,
        0.02142088f, 0.06438877f, 0.09794453f, 0.05745072f, 0.02788557f,
        0.02632830f, 0.07985807f, 4.24902979e-003f, 8.47890321e-003f,
        -0.02679466f, -5.28812688e-003f, -0.02162580f, -0.07490715f,
        -0.08251337f, -0.02056576f, -0.01026194f, -1.15492963e-003f,
        -5.75720915e-004f, -0.07210591f, -0.07320981f, -0.04883312f,
        -0.10897151f, -0.07477258f, -0.08867134f, -0.09222437f, -0.10924666f,
        -0.10430276f, 0.07953499f, 0.02767959f, 0.11393359f, 0.18779543f,
        0.03313421f, 0.02143700f, 0.05852016f, -2.12067598e-003f,
        -3.76984011e-003f, 0.02774167f, -0.03124610f, 0.01465141f, 0.01616004f,
        -0.01391913f, -0.04404102f, -0.05444227f, -0.14684731f, -0.15016587f,
        0.04509468f, 1.29563001e-003f, 0.01398350f, 0.05610404f, -0.04868806f,
        -0.04776716f, -8.16873740e-003f, -2.30126386e-003f, -0.02286313f,
        0.11983398f, -0.04703261f, -0.08814441f, -0.07585249f, -0.10799607f,
        -0.03232087f, 0.01509786f, -0.04843464f, -0.03967846f, 0.09589416f,
        0.01352560f, -0.01458119f, 0.01050829f, -0.03038946f, 0.01608388f,
        1.11975556e-003f, -0.01250656f, 2.86211423e-003f, 0.04333691f,
        -0.14603497f, -0.01946543f, -0.02327525f, -0.01973944f, 0.07944400f,
        -0.02224544f, -0.06701808f, 0.03476532f, 0.11505594f, -0.02712801f,
        -0.01665113f, 0.06315716f, -0.08205860f, 0.07431999f, 0.04915778f,
        -0.04468752f, -0.01490402f, 0.07400476f, -0.11650901f, 0.05102430f,
        0.04559118f, -0.05916039f, 0.08840760f, -0.01587902f, -0.14890194f,
        0.07857784f, 0.04710254f, -0.05381983f, -0.07331945f, -0.03604643f,
        0.15611970f, 0.07649943f, -0.05959348f, -0.02776607f, 0.11098688f,
        0.03758875f, -0.04446875f, 0.04933187f, 0.01345535f, 0.06921103f,
        0.07364785f, 0.05518956f, 0.02899585f, 0.09375840f, 0.10518434f,
        -0.04420241f, 0.01915282f, -3.56386811e-003f, 0.14586878f, 0.10286101f,
        -0.04360626f, -0.12723237f, 0.09076386f, 0.11119842f, -0.06035013f,
        0.09674817f, 0.08938243f, 0.07065924f, 0.02603180f, 5.84815582e-003f,
        -0.05922065f, 0.12360309f, 3.59695964e-003f, 2.99844006e-003f,
        0.03697936f, 0.02043072f, 0.04168725f, 0.01025975f, -0.01359980f,
        -0.01600920f, 0.02581056f, 0.02329250f, 2.98100687e-003f, 0.01629762f,
        0.06652115f, 0.05855627f, 0.01237463f, -0.01297135f, 0.01761587f,
        0.05090865f, 0.06549342f, -0.04425945f, 2.43203156e-003f,
        3.07327788e-003f, 0.06678630f, -0.04303836f, 0.01082393f, -0.06476044f,
        0.04077786f, 0.12441979f, 0.08237778f, 0.07424165f, 0.04065890f,
        0.06905543f, 0.09556347f, 0.12724875f, -0.02132082f, 0.08514154f,
        -0.04175328f, -0.02666954f, 0.01897836f, 0.03317382f, 9.45465732e-003f,
        -0.01238974f, -0.04242500f, -0.01419479f, -0.03545213f, -0.02440874f,
        0.08684119f, 0.04212951f, 0.02462858f, -0.01104825f, -5.01706870e-003f,
        0.02968982f, 0.02597476f, -0.01568939f, 0.04514892f, 0.06974549f,
        0.08670278f, 0.06828108f, 0.10238872f, 0.05405957f, 0.06548470f,
        -0.03763957f, 0.01366090f, 0.07069602f, 0.05363748f, 0.04798120f,
        0.11706422f, 0.05466456f, -0.01869259f, 0.06344382f, 0.03106543f,
        0.08432506f, -0.02061096f, 0.03821088f, -6.92190882e-003f,
        6.40467042e-003f, -0.01271779f, 6.89014705e-005f, 0.04541415f,
        -0.01899539f, -0.05020239f, 0.03000903f, 0.01090422f, 4.52452758e-003f,
        0.02573632f, -0.02388454f, -0.04200457f, 1.72783900e-003f,
        -0.05978370f, -0.02720562f, 0.06573715f, 0.01154317f, 0.01265615f,
        0.07375994f, -9.19828378e-003f, -0.04914120f, 0.02124831f, 0.06455322f,
        0.04372910f, -0.03310043f, 0.03605788f, -6.78055827e-003f,
        9.36202332e-003f, 0.01747596f, -0.06406314f, -0.06812935f, 0.08080816f,
        -0.02778088f, 0.02735260f, 0.06393493f, 0.06652229f, 0.05676993f,
        0.08640018f, -7.59188086e-003f, -0.02012847f, -0.04741159f,
        -0.01657069f, -0.01624399f, 0.05547778f, -2.33309763e-003f,
        0.01120033f, 0.06141156f, -0.06285004f, -0.08732341f, -0.09313398f,
        -0.04267832f, 5.57443965e-003f, 0.04809862f, 0.01773641f,
        5.37361018e-003f, 0.14842421f, -0.06298012f, -0.02935147f, 0.11443478f,
        -0.05034208f, 5.65494271e-003f, 0.02076526f, -0.04577984f,
        -0.04735741f, 0.02961071f, -0.09307127f, -0.04417921f, -0.04990027f,
        -0.03940028f, 0.01306016f, 0.06267900f, 0.03758737f, 0.08460117f,
        0.13858789f, 0.04862388f, -0.06319809f, -0.05655516f, 0.01885816f,
        -0.03285607f, 0.03371567f, -0.07040928f, -0.04514049f, 0.01392166f,
        0.08184422f, -0.07230316f, 0.02386871f, 0.02184591f, 0.02605764f,
        -0.01033954f, 9.29878280e-003f, 7.67351175e-003f, 0.15189242f,
        0.02069071f, -0.09738296f, -0.08894105f, -0.07768748f, 0.02332268f,
        -0.01778995f, -0.03258888f, -0.08180822f, -0.08492987f, 0.02290156f,
        -0.11368170f, -0.03554465f, -0.04533844f, -0.02861580f, 0.06782424f,
        0.01113123f, 0.02453644f, 0.12721945f, 0.08084814f, -0.03607795f,
        0.01109122f, 0.04803548f, -0.03489929f, 0.03399536f, -0.05682014f,
        8.59533902e-003f, -4.27904585e-003f, 0.03230887f, -0.01300198f,
        -0.01038137f, -0.07930113f, 8.33097473e-003f, 0.02296994f,
        -0.01306500f, -0.01881626f, 0.04413369f, 0.05729880f, -0.03761553f,
        0.01942326f, 1.64540811e-003f, -0.03811319f, 0.04190650f, -0.14978096f,
        -0.04514487f, 0.01209545f, -5.46460645e-003f, -0.01647195f,
        7.63064111e-003f, -0.07494587f, 0.08415288f, 0.10020141f, -0.01228561f,
        0.06553826f, 0.04554005f, 0.07890417f, 0.03041138f, 0.01752007f,
        0.09208256f, -3.74419295e-004f, 0.10549527f, 0.04686913f, 0.01894833f,
        -0.02651412f, -4.34682379e-003f, 5.44942822e-003f, 0.01444484f,
        0.05882156f, -0.03336544f, 0.04603891f, -0.10432546f, 0.01923928f,
        0.01842845f, -0.01712168f, -0.02222766f, 0.04693324f, -0.06202956f,
        -0.01422159f, 0.08732220f, -0.07706107f, 0.02661049f, -0.04300238f,
        -0.03092422f, -0.03552184f, -0.01886088f, -0.04979934f, 0.03906401f,
        0.04608644f, 0.04966111f, 0.04275464f, -0.04621769f, -0.02653212f,
        8.57011229e-003f, 0.03839684f, 0.05818764f, 0.03880796f,
        -2.76100676e-004f, 0.03076511f, -0.03266929f, -0.05374557f,
        0.04986527f, -9.45429131e-003f, 0.03582499f, -2.64564669e-003f,
        -1.07461517e-003f, 0.02962313f, -0.01483363f, 0.03060869f, 0.02448327f,
        0.01845641f, 0.03282966f, -0.03534438f, -0.01084059f, -0.01119136f,
        -1.85360224e-003f, -5.94652840e-004f, -0.04451817f, 2.98327743e-003f,
        0.06272484f, -0.02152076f, -3.05971340e-003f, -0.05070828f,
        0.01531762f, 0.01282815f, 0.05167150f, 9.46266949e-003f,
        -3.34558333e-003f, 0.11442288f, -0.03906701f, -2.67325155e-003f,
        0.03069184f, -0.01134165f, 0.02949462f, 0.02879886f, 0.03855566f,
        -0.03450781f, 0.09142872f, -0.02156654f, 0.06075062f, -0.06220816f,
        0.01944680f, 6.68372354e-003f, -0.06656796f, 8.70784000e-003f,
        0.03456013f, 0.02434320f, -0.13236357f, -0.04177035f, -0.02069627f,
        0.01068112f, 0.01505432f, -0.07517391f, -3.83571628e-003f,
        -0.06298508f, -0.02881260f, -0.13101046f, -0.07221562f,
        -5.79945277e-003f, -8.57300125e-003f, 0.03782469f, 0.02762164f,
        0.04942456f, -0.02936396f, 0.09597211f, 0.01921411f, 0.06101191f,
        -0.04787507f, -0.01379578f, -7.40224449e-003f, -0.02220136f,
        -0.01313756f, 7.77558051e-003f, 0.12296968f, 0.02939998f, 0.03594062f,
        -0.07788624f, -0.01133144f, 3.99316690e-004f, -0.06090347f,
        -0.01122066f, -4.68682544e-003f, 0.07633100f, -0.06748922f,
        -0.05640298f, -0.05265681f, -0.01139122f, -0.01624347f, -0.04715714f,
        -0.01099092f, 0.01048561f, 3.28499987e-003f, -0.05810167f,
        -0.07699911f, -0.03330683f, 0.04185145f, 0.03478536f, 0.02275165f,
        0.02304766f, 6.66040834e-003f, 0.10968148f, -5.93013782e-003f,
        -0.04858336f, -0.04203213f, -0.09316786f, -6.13074889e-003f,
        -0.02544625f, 0.01366201f, 9.18555818e-003f, -0.01846578f,
        -0.05622401f, -0.03989377f, -0.07810296f, 6.91275718e-003f,
        0.05957597f, -0.03901334f, 0.01572002f, -0.01193903f,
        -6.89400872e-003f, -0.03093356f, -0.04136098f, -0.01562869f,
        -0.04604580f, 0.02865234f, -0.08678447f, -0.03232484f, -0.05364593f,
        -0.01445016f, -0.07003860f, -0.08669746f, -0.04520775f, 0.04274122f,
        0.03117515f, 0.08175703f, 0.01081109f, 0.06379741f, 0.06199206f,
        0.02865988f, 0.02360346f, 0.06725410f, -0.03248780f, -9.37702879e-003f,
        0.08265898f, -0.02245839f, 0.05125763f, -0.01862395f, 0.01973453f,
        -0.01994494f, -0.10770868f, 0.03180375f, 3.23935156e-003f,
        -0.02142080f, -0.04256190f, 0.04760900f, 0.04282863f, 0.05635953f,
        -0.01870849f, 0.05540622f, -0.03042666f, 0.01455277f, -0.06630179f,
        -0.05843807f, -0.03739681f, -0.09739155f, -0.03220233f, -0.05620182f,
        -0.10381401f, 0.07400211f, 4.20676917e-003f, 0.03258535f,
        2.14308966e-003f, 0.05121966f, -0.01274337f, 0.02384761f, 0.06335578f,
        -0.07905591f, 0.08375625f, -0.07898903f, -0.06508528f, -0.02498444f,
        0.06535810f, 0.03970535f, 0.04895468f, -0.01169566f, -0.03980601f,
        0.05682293f, 0.05925463f, -0.01165808f, -0.07936699f, -0.04208954f,
        0.01333987f, 0.09051196f, 0.10098671f, -0.03974256f, 0.01238771f,
        -0.07501741f, -0.03655440f, -0.04301528f, 0.09216860f,
        4.63579083e-004f, 0.02851115f, 0.02142735f, 1.28244064e-004f,
        0.02879687f, -0.08554889f, -0.04838862f, 0.08135369f, -0.05756533f,
        0.01413900f, 0.03451880f, -0.06619488f, -0.03053130f, 0.02961676f,
        -0.07384635f, 0.01135692f, 0.05283910f, -0.07778034f, -0.02107482f,
        -0.05511716f, -0.13473752f, 0.03030157f, 0.06722020f, -0.06218817f,
        -0.05826827f, 0.06254654f, 0.02895772f, -0.01664000f, -0.03620280f,
        -0.01612278f, -1.46097376e-003f, 0.14013411f, -8.96181818e-003f,
        -0.03250246f, 3.38630192e-003f, 2.64779478e-003f, 0.03359732f,
        -0.02411991f, -0.04229729f, 0.10666174f, -6.66579151f };
    return std::vector<float>(detector, detector + sizeof(detector)/sizeof(detector[0]));
}

// This function renurn 1981 SVM coeffs obtained from daimler's base.
// To use these coeffs the detection window size should be (48,96)
std::vector<float> HOGDescriptor::getDaimlerPeopleDetector()
{
    static const float detector[] = {
        0.294350f, -0.098796f, -0.129522f, 0.078753f,
        0.387527f, 0.261529f, 0.145939f, 0.061520f,
        0.328699f, 0.227148f, -0.066467f, -0.086723f,
        0.047559f, 0.106714f, 0.037897f, 0.111461f,
        -0.024406f, 0.304769f, 0.254676f, -0.069235f,
        0.082566f, 0.147260f, 0.326969f, 0.148888f,
        0.055270f, -0.087985f, 0.261720f, 0.143442f,
        0.026812f, 0.238212f, 0.194020f, 0.056341f,
        -0.025854f, -0.034444f, -0.156631f, 0.205174f,
        0.089008f, -0.139811f, -0.100147f, -0.037830f,
        -0.029230f, -0.055641f, 0.033248f, -0.016512f,
        0.155244f, 0.247315f, -0.124694f, -0.048414f,
        -0.062219f, 0.193683f, 0.004574f, 0.055089f,
        0.093565f, 0.167712f, 0.167581f, 0.018895f,
        0.215258f, 0.122609f, 0.090520f, -0.067219f,
        -0.049029f, -0.099615f, 0.241804f, -0.094893f,
        -0.176248f, 0.001727f, -0.134473f, 0.104442f,
        0.050942f, 0.081165f, 0.072156f, 0.121646f,
        0.002656f, -0.297974f, -0.133587f, -0.060121f,
        -0.092515f, -0.048974f, -0.084754f, -0.180111f,
        -0.038590f, 0.086283f, -0.134636f, -0.107249f,
        0.132890f, 0.141556f, 0.249425f, 0.130273f,
        -0.030031f, 0.073212f, -0.008155f, 0.019931f,
        0.071688f, 0.000300f, -0.019525f, -0.021725f,
        -0.040993f, -0.086841f, 0.070124f, 0.240033f,
        0.265350f, 0.043208f, 0.166754f, 0.091453f,
        0.060916f, -0.036972f, -0.091043f, 0.079873f,
        0.219781f, 0.158102f, -0.140618f, -0.043016f,
        0.124802f, 0.093668f, 0.103208f, 0.094872f,
        0.080541f, 0.137711f, 0.160566f, -0.169231f,
        0.013983f, 0.309508f, -0.004217f, -0.057200f,
        -0.064489f, 0.014066f, 0.361009f, 0.251328f,
        -0.080983f, -0.044183f, 0.061436f, -0.037381f,
        -0.078786f, 0.030993f, 0.066314f, 0.037683f,
        0.152325f, -0.091683f, 0.070203f, 0.217856f,
        0.036435f, -0.076462f, 0.006254f, -0.094431f,
        0.154829f, -0.023038f, -0.196961f, -0.024594f,
        0.178465f, -0.050139f, -0.045932f, -0.000965f,
        0.109112f, 0.046165f, -0.159373f, -0.008713f,
        0.041307f, 0.097129f, -0.057211f, -0.064599f,
        0.077165f, 0.176167f, 0.138322f, 0.065753f,
        -0.104950f, 0.017933f, 0.136255f, -0.011598f,
        0.047007f, 0.080550f, 0.068619f, 0.084661f,
        -0.035493f, -0.091314f, -0.041411f, 0.060971f,
        -0.101912f, -0.079870f, -0.085977f, -0.022686f,
        0.079788f, -0.098064f, -0.054603f, 0.040383f,
        0.300794f, 0.128603f, 0.094844f, 0.047407f,
        0.101825f, 0.061832f, -0.162160f, -0.204553f,
        -0.035165f, 0.101450f, -0.016641f, -0.027140f,
        -0.134392f, -0.008743f, 0.102331f, 0.114853f,
        0.009644f, 0.062823f, 0.237339f, 0.167843f,
        0.053066f, -0.012592f, 0.043158f, 0.002305f,
        0.065001f, -0.038929f, -0.020356f, 0.152343f,
        0.043469f, -0.029967f, -0.042948f, 0.032481f,
        0.068488f, -0.110840f, -0.111083f, 0.111980f,
        -0.002072f, -0.005562f, 0.082926f, 0.006635f,
        -0.108153f, 0.024242f, -0.086464f, -0.189884f,
        -0.017492f, 0.191456f, -0.007683f, -0.128769f,
        -0.038017f, -0.132380f, 0.091926f, 0.079696f,
        -0.106728f, -0.007656f, 0.172744f, 0.011576f,
        0.009883f, 0.083258f, -0.026516f, 0.145534f,
        0.153924f, -0.130290f, -0.108945f, 0.124490f,
        -0.003186f, -0.100485f, 0.015024f, -0.060512f,
        0.026288f, -0.086713f, -0.169012f, 0.076517f,
        0.215778f, 0.043701f, -0.131642f, -0.012585f,
        -0.045181f, -0.118183f, -0.241544f, -0.167293f,
        -0.020107f, -0.019917f, -0.101827f, -0.107096f,
        -0.010503f, 0.044938f, 0.189680f, 0.217119f,
        -0.046086f, 0.044508f, 0.199716f, -0.036004f,
        -0.148927f, 0.013355f, -0.078279f, 0.030451f,
        0.056301f, -0.024609f, 0.083224f, 0.099533f,
        -0.039432f, -0.138880f, 0.005482f, -0.024120f,
        -0.140468f, -0.066381f, -0.017057f, 0.009260f,
        -0.058004f, -0.028486f, -0.061610f, 0.007483f,
        -0.158309f, -0.150687f, -0.044595f, -0.105121f,
        -0.045763f, -0.006618f, -0.024419f, -0.117713f,
        -0.119366f, -0.175941f, -0.071542f, 0.119027f,
        0.111362f, 0.043080f, 0.034889f, 0.093003f,
        0.007842f, 0.057368f, -0.108834f, -0.079968f,
        0.230959f, 0.020205f, 0.011470f, 0.098877f,
        0.101310f, -0.030215f, -0.018018f, -0.059552f,
        -0.106157f, 0.021866f, -0.036471f, 0.080051f,
        0.041165f, -0.082101f, 0.117726f, 0.030961f,
        -0.054763f, -0.084102f, -0.185778f, -0.061305f,
        -0.038089f, -0.110728f, -0.264010f, 0.076675f,
        -0.077111f, -0.137644f, 0.036232f, 0.277995f,
        0.019116f, 0.107738f, 0.144003f, 0.080304f,
        0.215036f, 0.228897f, 0.072713f, 0.077773f,
        0.120168f, 0.075324f, 0.062730f, 0.122478f,
        -0.049008f, 0.164912f, 0.162450f, 0.041246f,
        0.009891f, -0.097827f, -0.038700f, -0.023027f,
        -0.120020f, 0.203364f, 0.248474f, 0.149810f,
        -0.036276f, -0.082814f, -0.090343f, -0.027143f,
        -0.075689f, -0.320310f, -0.000500f, -0.143334f,
        -0.065077f, -0.186936f, 0.129372f, 0.116431f,
        0.181699f, 0.170436f, 0.418854f, 0.460045f,
        0.333719f, 0.230515f, 0.047822f, -0.044954f,
        -0.068086f, 0.140179f, -0.044821f, 0.085550f,
        0.092483f, -0.107296f, -0.130670f, -0.206629f,
        0.114601f, -0.317869f, -0.076663f, 0.038680f,
        0.212753f, -0.016059f, -0.126526f, -0.163602f,
        0.210154f, 0.099887f, -0.126366f, 0.118453f,
        0.019309f, -0.021611f, -0.096499f, -0.111809f,
        -0.200489f, 0.142854f, 0.228840f, -0.353346f,
        -0.179151f, 0.116834f, 0.252389f, -0.031728f,
        -0.188135f, -0.158998f, 0.386523f, 0.122315f,
        0.209944f, 0.394023f, 0.359030f, 0.260717f,
        0.170335f, 0.013683f, -0.142596f, -0.026138f,
        -0.011878f, -0.150519f, 0.047159f, -0.107062f,
        -0.147347f, -0.187689f, -0.186027f, -0.208048f,
        0.058468f, -0.073026f, -0.236556f, -0.079788f,
        -0.146216f, -0.058563f, -0.101361f, -0.071294f,
        -0.071093f, 0.116919f, 0.234304f, 0.306781f,
        0.321866f, 0.240000f, 0.073261f, -0.012173f,
        0.026479f, 0.050173f, 0.166127f, 0.228955f,
        0.061905f, 0.156460f, 0.205990f, 0.120672f,
        0.037350f, 0.167884f, 0.290099f, 0.420900f,
        -0.012601f, 0.189839f, 0.306378f, 0.118383f,
        -0.095598f, -0.072360f, -0.132496f, -0.224259f,
        -0.126021f, 0.022714f, 0.284039f, 0.051369f,
        -0.000927f, -0.058735f, -0.083354f, -0.141254f,
        -0.187578f, -0.202669f, 0.048902f, 0.246597f,
        0.441863f, 0.342519f, 0.066979f, 0.215286f,
        0.188191f, -0.072240f, -0.208142f, -0.030196f,
        0.178141f, 0.136985f, -0.043374f, -0.181098f,
        0.091815f, 0.116177f, -0.126690f, -0.386625f,
        0.368165f, 0.269149f, -0.088042f, -0.028823f,
        0.092961f, 0.024099f, 0.046112f, 0.176756f,
        0.135849f, 0.124955f, 0.195467f, -0.037218f,
        0.167217f, 0.188938f, 0.053528f, -0.066561f,
        0.133721f, -0.070565f, 0.115898f, 0.152435f,
        -0.116993f, -0.110592f, -0.179005f, 0.026668f,
        0.080530f, 0.075084f, -0.070401f, 0.012497f,
        0.021849f, -0.139764f, -0.022020f, -0.096301f,
        -0.064954f, -0.127446f, -0.013806f, -0.108315f,
        0.156285f, 0.149867f, -0.011382f, 0.064532f,
        0.029168f, 0.027393f, 0.069716f, 0.153735f,
        0.038459f, 0.230714f, 0.253840f, 0.059522f,
        -0.045053f, 0.014083f, 0.071103f, 0.068747f,
        0.095887f, 0.005832f, 0.144887f, 0.026357f,
        -0.067359f, -0.044151f, -0.123283f, -0.019911f,
        0.005318f, 0.109208f, -0.003201f, -0.021734f,
        0.142025f, -0.066907f, -0.120070f, -0.188639f,
        0.012472f, -0.048704f, -0.012366f, -0.184828f,
        0.168591f, 0.267166f, 0.058208f, -0.044101f,
        0.033500f, 0.178558f, 0.104550f, 0.122418f,
        0.080177f, 0.173246f, 0.298537f, 0.064173f,
        0.053397f, 0.174341f, 0.230984f, 0.117025f,
        0.166242f, 0.227781f, 0.120623f, 0.176952f,
        -0.011393f, -0.086483f, -0.008270f, 0.051700f,
        -0.153369f, -0.058837f, -0.057639f, -0.060115f,
        0.026349f, -0.160745f, -0.037894f, -0.048575f,
        0.041052f, -0.022112f, 0.060365f, 0.051906f,
        0.162657f, 0.138519f, -0.050185f, -0.005938f,
        0.071301f, 0.127686f, 0.062342f, 0.144400f,
        0.072600f, 0.198436f, 0.246219f, -0.078185f,
        -0.036169f, 0.075934f, 0.047328f, -0.013601f,
        0.087205f, 0.019900f, 0.022606f, -0.015365f,
        -0.092506f, 0.075275f, -0.116375f, 0.050500f,
        0.045118f, 0.166567f, 0.072073f, 0.060371f,
        0.131747f, -0.169863f, -0.039352f, -0.047486f,
        -0.039797f, -0.204312f, 0.021710f, 0.129443f,
        -0.021173f, 0.173416f, -0.070794f, -0.063986f,
        0.069689f, -0.064099f, -0.123201f, -0.017372f,
        -0.206870f, 0.065863f, 0.113226f, 0.024707f,
        -0.071341f, -0.066964f, -0.098278f, -0.062927f,
        0.075840f, 0.014716f, 0.019378f, 0.132699f,
        -0.074191f, -0.089557f, -0.078446f, -0.197488f,
        -0.173665f, 0.052583f, 0.044361f, 0.113549f,
        0.098492f, 0.077379f, -0.011146f, -0.192593f,
        -0.164435f, 0.045568f, 0.205699f, 0.049187f,
        -0.082281f, 0.134874f, 0.185499f, 0.034968f,
        -0.119561f, -0.112372f, -0.115091f, -0.054042f,
        -0.183816f, -0.078100f, 0.190695f, 0.091617f,
        0.004257f, -0.041135f, -0.061453f, -0.141592f,
        -0.194809f, -0.120638f, 0.020168f, 0.109672f,
        0.067398f, -0.015238f, -0.239145f, -0.264671f,
        -0.185176f, 0.050472f, 0.020793f, 0.035678f,
        0.022839f, -0.052055f, -0.127968f, -0.113049f,
        -0.228416f, -0.258281f, -0.053437f, 0.076424f,
        0.061450f, 0.237478f, 0.003618f, -0.055865f,
        -0.108087f, -0.028937f, 0.045585f, 0.052829f,
        -0.001471f, 0.022826f, 0.059565f, -0.104430f,
        -0.077266f, -0.211882f, -0.212078f, 0.028074f,
        0.075846f, 0.016265f, 0.161879f, 0.134477f,
        0.008935f, -0.048041f, 0.074692f, 0.004928f,
        -0.025156f, 0.192874f, 0.074410f, 0.308732f,
        0.267400f, 0.094208f, -0.005251f, 0.042041f,
        -0.032148f, 0.015588f, 0.252869f, 0.175302f,
        0.022892f, 0.081673f, 0.063208f, 0.162626f,
        0.194426f, 0.233890f, 0.262292f, 0.186930f,
        0.084079f, -0.286388f, -0.213034f, -0.048867f,
        -0.207669f, -0.170050f, 0.011673f, -0.092958f,
        -0.192786f, -0.273536f, 0.230904f, 0.266732f,
        0.320519f, 0.297155f, 0.548169f, 0.304922f,
        0.132687f, 0.247333f, 0.212488f, -0.271472f,
        -0.142105f, -0.002627f, -0.119215f, 0.128383f,
        0.100079f, -0.057490f, -0.121902f, -0.228892f,
        0.202292f, -0.399795f, -0.371326f, -0.095836f,
        -0.063626f, -0.161375f, -0.311180f, -0.294797f,
        0.242122f, 0.011788f, 0.095573f, 0.322523f,
        0.511840f, 0.322880f, 0.313259f, 0.173331f,
        0.002542f, -0.029802f, 0.324766f, -0.326170f,
        -0.340547f, -0.138288f, -0.002963f, -0.114060f,
        -0.377312f, -0.442570f, 0.212446f, -0.007759f,
        -0.011576f, 0.169711f, 0.308689f, 0.317348f,
        0.539390f, 0.332845f, 0.057331f, -0.068180f,
        0.101994f, 0.266995f, 0.209570f, 0.355730f,
        0.091635f, 0.170238f, 0.125215f, 0.274154f,
        0.070223f, 0.025515f, 0.049946f, -0.000550f,
        0.043715f, -0.141843f, 0.020844f, 0.129871f,
        0.256588f, 0.105015f, 0.148339f, 0.170682f,
        0.028792f, 0.074037f, 0.160042f, 0.405137f,
        0.246187f, 0.352160f, 0.168951f, 0.222263f,
        0.264439f, 0.065945f, 0.021963f, -0.075084f,
        0.093105f, 0.027318f, 0.098864f, 0.057566f,
        -0.080282f, 0.185032f, 0.314419f, 0.333727f,
        0.125798f, 0.294919f, 0.386002f, 0.217619f,
        -0.183517f, -0.278622f, -0.002342f, -0.027821f,
        -0.134266f, -0.331843f, -0.008296f, 0.124564f,
        0.053712f, -0.369016f, -0.095036f, 0.209381f,
        0.423760f, 0.371760f, 0.106397f, 0.369408f,
        0.485608f, 0.231201f, -0.138685f, -0.349208f,
        -0.070083f, 0.028991f, -0.081630f, -0.395992f,
        -0.146791f, -0.027354f, 0.063396f, -0.272484f,
        0.058299f, 0.338207f, 0.110767f, -0.052642f,
        -0.233848f, -0.027448f, 0.030328f, 0.155572f,
        -0.093826f, 0.019331f, 0.120638f, 0.006292f,
        -0.106083f, -0.236290f, -0.140933f, -0.088067f,
        -0.025138f, -0.208395f, -0.025502f, 0.144192f,
        -0.048353f, -0.106144f, -0.305121f, -0.114147f,
        0.090963f, 0.327727f, 0.035606f, -0.093779f,
        0.002651f, -0.171081f, -0.188131f, -0.216571f,
        -0.209101f, -0.054402f, 0.157147f, -0.057127f,
        0.066584f, 0.008988f, 0.041191f, 0.034456f,
        -0.078255f, 0.052099f, -0.022239f, 0.066981f,
        -0.117520f, -0.072637f, 0.062512f, 0.037570f,
        -0.057544f, -0.312359f, 0.034357f, -0.031549f,
        0.002566f, -0.207375f, -0.070654f, -0.018786f,
        -0.044815f, -0.012814f, -0.076320f, 0.078183f,
        0.023877f, 0.117078f, 0.022292f, -0.205424f,
        -0.060430f, -0.017296f, -0.004827f, -0.321036f,
        -0.092155f, 0.038837f, 0.073190f, -0.067513f,
        0.026521f, 0.171945f, 0.087318f, 0.034495f,
        -0.034089f, 0.154410f, -0.061431f, 0.007435f,
        -0.111094f, -0.095976f, 0.014741f, -0.132324f,
        -0.029517f, -0.192160f, 0.098667f, 0.020762f,
        0.177050f, -0.064510f, -0.054437f, -0.058678f,
        -0.001858f, 0.167602f, 0.015735f, 0.054338f,
        0.016477f, 0.186381f, -0.010667f, 0.054692f,
        0.126742f, 0.013140f, 0.090353f, -0.133608f,
        -0.018017f, -0.152619f, 0.027600f, -0.138700f,
        -0.050274f, 0.045141f, -0.118731f, 0.094797f,
        -0.167605f, 0.097461f, -0.009131f, 0.199920f,
        -0.052976f, 0.158194f, 0.178568f, -0.107600f,
        0.009671f, -0.084072f, -0.040258f, -0.205673f,
        0.102891f, 0.223511f, 0.042699f, 0.118548f,
        -0.021274f, 0.110997f, -0.155121f, 0.027696f,
        -0.149968f, 0.051552f, -0.129219f, 0.173524f,
        0.073972f, -0.189045f, -0.034523f, -0.106655f,
        -0.011843f, -0.197381f, 0.219413f, 0.183197f,
        -0.054920f, 0.144955f, 0.036517f, -0.085412f,
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        -0.099860f, 0.073371f, 0.342805f, 0.098305f,
        -0.150910f, -0.020822f, -0.056960f, 0.046262f,
        -0.043413f, -0.149405f, -0.129105f, -0.010899f,
        -0.014229f, -0.179949f, -0.113044f, -0.049468f,
        -0.065513f, 0.090269f, -0.011919f, 0.087846f,
        0.095796f, 0.146127f, 0.101599f, 0.078066f,
        -0.084348f, -0.100002f, -0.020134f, -0.050169f,
        0.062122f, 0.014640f, 0.019143f, 0.036543f,
        0.180924f, -0.013976f, -0.066768f, -0.001090f,
        -0.070419f, -0.004839f, -0.001504f, 0.034483f,
        -0.044954f, -0.050336f, -0.088638f, -0.174782f,
        -0.116082f, -0.205507f, 0.015587f, -0.042839f,
        -0.096879f, -0.144097f, -0.050268f, -0.196796f,
        0.109639f, 0.271411f, 0.173732f, 0.108070f,
        0.156437f, 0.124255f, 0.097242f, 0.238693f,
        0.083941f, 0.109105f, 0.223940f, 0.267188f,
        0.027385f, 0.025819f, 0.125070f, 0.093738f,
        0.040353f, 0.038645f, -0.012730f, 0.144063f,
        0.052931f, -0.009138f, 0.084193f, 0.160272f,
        -0.041366f, 0.011951f, -0.121446f, -0.106713f,
        -0.047566f, 0.047984f, -0.255224f, -0.076116f,
        0.098685f, -0.150845f, -0.171513f, -0.156590f,
        0.058331f, 0.187493f, 0.413018f, 0.554265f,
        0.372242f, 0.237943f, 0.124571f, 0.110829f,
        0.010322f, -0.174477f, -0.067627f, -0.001979f,
        0.142913f, 0.040597f, 0.019907f, 0.025963f,
        -0.043585f, -0.120732f, 0.099937f, 0.091059f,
        0.247307f, 0.204226f, -0.042753f, -0.068580f,
        -0.119002f, 0.026722f, 0.034853f, -0.060934f,
        -0.025054f, -0.093026f, -0.035372f, -0.233209f,
        -0.049869f, -0.039151f, -0.022279f, -0.065380f,
        -9.063785f};
    return std::vector<float>(detector, detector + sizeof(detector)/sizeof(detector[0]));
}

class HOGConfInvoker :
    public ParallelLoopBody
{
public:
    HOGConfInvoker( const HOGDescriptor* _hog, const Mat& _img,
        double _hitThreshold, const Size& _padding,
        std::vector<DetectionROI>* locs,
        std::vector<Rect>* _vec, Mutex* _mtx )
    {
        hog = _hog;
        img = _img;
        hitThreshold = _hitThreshold;
        padding = _padding;
        locations = locs;
        vec = _vec;
        mtx = _mtx;
    }

    void operator()(const Range& range) const CV_OVERRIDE
    {
        CV_INSTRUMENT_REGION();

        int i, i1 = range.start, i2 = range.end;

        Size maxSz(cvCeil(img.cols/(*locations)[0].scale), cvCeil(img.rows/(*locations)[0].scale));
        Mat smallerImgBuf(maxSz, img.type());
        std::vector<Point> dets;

        for( i = i1; i < i2; i++ )
        {
            double scale = (*locations)[i].scale;

            Size sz(cvRound(img.cols / scale), cvRound(img.rows / scale));
            Mat smallerImg(sz, img.type(), smallerImgBuf.ptr());

            if( sz == img.size() )
                smallerImg = Mat(sz, img.type(), img.data, img.step);
            else
                resize(img, smallerImg, sz, 0, 0, INTER_LINEAR_EXACT);

            hog->detectROI(smallerImg, (*locations)[i].locations, dets, (*locations)[i].confidences, hitThreshold, Size(), padding);
            Size scaledWinSize = Size(cvRound(hog->winSize.width*scale), cvRound(hog->winSize.height*scale));
            mtx->lock();
            for( size_t j = 0; j < dets.size(); j++ )
                vec->push_back(Rect(cvRound(dets[j].x*scale),
                                    cvRound(dets[j].y*scale),
                                    scaledWinSize.width, scaledWinSize.height));
            mtx->unlock();
        }
    }

    const HOGDescriptor* hog;
    Mat img;
    double hitThreshold;
    std::vector<DetectionROI>* locations;
    Size padding;
    std::vector<Rect>* vec;
    Mutex* mtx;
};

void HOGDescriptor::detectROI(InputArray _img, const std::vector<cv::Point> &locations,
    CV_OUT std::vector<cv::Point>& foundLocations, CV_OUT std::vector<double>& confidences,
    double hitThreshold, cv::Size winStride, cv::Size padding) const
{
    CV_INSTRUMENT_REGION();

    Mat img = _img.getMat();
    foundLocations.clear();
    confidences.clear();

    if( svmDetector.empty() || locations.empty())
        return;

    if( winStride == Size() )
        winStride = cellSize;
    Size cacheStride(gcd(winStride.width, blockStride.width),
                     gcd(winStride.height, blockStride.height));

    size_t nwindows = locations.size();
    padding.width = (int)alignSize(std::max(padding.width, 0), cacheStride.width);
    padding.height = (int)alignSize(std::max(padding.height, 0), cacheStride.height);
    Size paddedImgSize(img.cols + padding.width*2, img.rows + padding.height*2);

    // HOGCache cache(this, img, padding, padding, nwindows == 0, cacheStride);
    HOGCache cache(this, img, padding, padding, true, cacheStride);
    if( !nwindows )
        nwindows = cache.windowsInImage(paddedImgSize, winStride).area();

    const HOGCache::BlockData* blockData = &cache.blockData[0];

    int nblocks = cache.nblocks.area();
    int blockHistogramSize = cache.blockHistogramSize;
    size_t dsize = getDescriptorSize();

    double rho = svmDetector.size() > dsize ? svmDetector[dsize] : 0;
    std::vector<float> blockHist(blockHistogramSize);

#if CV_SSE2 || CV_NEON
    float partSum[4];
#endif

    for( size_t i = 0; i < nwindows; i++ )
    {
        Point pt0;
        pt0 = locations[i];
        if( pt0.x < -padding.width || pt0.x > img.cols + padding.width - winSize.width ||
                pt0.y < -padding.height || pt0.y > img.rows + padding.height - winSize.height )
        {
            // out of image
            confidences.push_back(-10.0);
            continue;
        }

        double s = rho;
        const float* svmVec = &svmDetector[0];
        int j, k;

        for( j = 0; j < nblocks; j++, svmVec += blockHistogramSize )
        {
            const HOGCache::BlockData& bj = blockData[j];
            Point pt = pt0 + bj.imgOffset;

            // need to divide this into 4 parts!
            const float* vec = cache.getBlock(pt, &blockHist[0]);
#if CV_SSE2
            __m128 _vec = _mm_loadu_ps(vec);
            __m128 _svmVec = _mm_loadu_ps(svmVec);
            __m128 sum = _mm_mul_ps(_svmVec, _vec);

            for( k = 4; k <= blockHistogramSize - 4; k += 4 )
            {
                _vec = _mm_loadu_ps(vec + k);
                _svmVec = _mm_loadu_ps(svmVec + k);

                sum = _mm_add_ps(sum, _mm_mul_ps(_vec, _svmVec));
            }

            _mm_storeu_ps(partSum, sum);
            double t0 = partSum[0] + partSum[1];
            double t1 = partSum[2] + partSum[3];
            s += t0 + t1;
#elif CV_NEON
            float32x4_t _vec = vld1q_f32(vec);
            float32x4_t _svmVec = vld1q_f32(svmVec);
            float32x4_t sum = vmulq_f32(_svmVec, _vec);

            for( k = 4; k <= blockHistogramSize - 4; k += 4 )
            {
                _vec = vld1q_f32(vec + k);
                _svmVec = vld1q_f32(svmVec + k);

                sum = vaddq_f32(sum, vmulq_f32(_vec, _svmVec));
            }

            vst1q_f32(partSum, sum);
            double t0 = partSum[0] + partSum[1];
            double t1 = partSum[2] + partSum[3];
            s += t0 + t1;
#else
            for( k = 0; k <= blockHistogramSize - 4; k += 4 )
                s += vec[k]*svmVec[k] + vec[k+1]*svmVec[k+1] +
                        vec[k+2]*svmVec[k+2] + vec[k+3]*svmVec[k+3];
#endif
            for( ; k < blockHistogramSize; k++ )
                s += vec[k]*svmVec[k];
        }
        confidences.push_back(s);

        if( s >= hitThreshold )
            foundLocations.push_back(pt0);
    }
}

void HOGDescriptor::detectMultiScaleROI(InputArray _img,
    CV_OUT std::vector<cv::Rect>& foundLocations, std::vector<DetectionROI>& locations,
    double hitThreshold, int groupThreshold) const
{
    CV_INSTRUMENT_REGION();

    Mat img = _img.getMat();
    std::vector<Rect> allCandidates;
    Mutex mtx;

    parallel_for_(Range(0, (int)locations.size()),
                  HOGConfInvoker(this, img, hitThreshold, Size(8, 8),
                                 &locations, &allCandidates, &mtx));

    foundLocations.resize(allCandidates.size());
    std::copy(allCandidates.begin(), allCandidates.end(), foundLocations.begin());
    cv::groupRectangles(foundLocations, groupThreshold, 0.2);
}

void HOGDescriptor::groupRectangles(std::vector<cv::Rect>& rectList, std::vector<double>& weights, int groupThreshold, double eps) const
{
    CV_INSTRUMENT_REGION();

    if( groupThreshold <= 0 || rectList.empty() )
    {
        return;
    }

    CV_Assert(rectList.size() == weights.size());

    std::vector<int> labels;
    int nclasses = partition(rectList, labels, SimilarRects(eps));

    std::vector<cv::Rect_<double> > rrects(nclasses);
    std::vector<int> numInClass(nclasses, 0);
    std::vector<double> foundWeights(nclasses, -std::numeric_limits<double>::max());
    int i, j, nlabels = (int)labels.size();

    for( i = 0; i < nlabels; i++ )
    {
        int cls = labels[i];
        rrects[cls].x += rectList[i].x;
        rrects[cls].y += rectList[i].y;
        rrects[cls].width += rectList[i].width;
        rrects[cls].height += rectList[i].height;
        foundWeights[cls] = max(foundWeights[cls], weights[i]);
        numInClass[cls]++;
    }

    for( i = 0; i < nclasses; i++ )
    {
        // find the average of all ROI in the cluster
        cv::Rect_<double> r = rrects[i];
        double s = 1.0/numInClass[i];
        rrects[i] = cv::Rect_<double>(cv::saturate_cast<double>(r.x*s),
            cv::saturate_cast<double>(r.y*s),
            cv::saturate_cast<double>(r.width*s),
            cv::saturate_cast<double>(r.height*s));
    }

    rectList.clear();
    weights.clear();

    for( i = 0; i < nclasses; i++ )
    {
        cv::Rect r1 = rrects[i];
        int n1 = numInClass[i];
        double w1 = foundWeights[i];
        if( n1 <= groupThreshold )
            continue;
        // filter out small rectangles inside large rectangles
        for( j = 0; j < nclasses; j++ )
        {
            int n2 = numInClass[j];

            if( j == i || n2 <= groupThreshold )
                continue;

            cv::Rect r2 = rrects[j];

            int dx = cv::saturate_cast<int>( r2.width * eps );
            int dy = cv::saturate_cast<int>( r2.height * eps );

            if( r1.x >= r2.x - dx &&
                r1.y >= r2.y - dy &&
                r1.x + r1.width <= r2.x + r2.width + dx &&
                r1.y + r1.height <= r2.y + r2.height + dy &&
                (n2 > std::max(3, n1) || n1 < 3) )
                break;
        }

        if( j == nclasses )
        {
            rectList.push_back(r1);
            weights.push_back(w1);
        }
    }
}
}