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Merge pull request #12279 from savuor:cvtcolor_bgr2gray_8u_15bits

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* bgr2gray 8u fixed to be in conformance with IPP code

* coefficients fixed so their sum is 32768

* java test for CascadeDetect fixed: equalizeHist added
This commit is contained in:
Rostislav Vasilikhin 2018-09-06 13:28:24 +03:00 committed by Alexander Alekhin
parent 43b64140ae
commit da7e1cfb49
4 changed files with 16 additions and 6 deletions
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4
modules/imgproc/src/color.hpp
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@ -22,11 +22,15 @@ const float R2YF = 0.299f;
enum
{
gray_shift = 15,
yuv_shift = 14,
xyz_shift = 12,
R2Y = 4899, // == R2YF*16384
G2Y = 9617, // == G2YF*16384
B2Y = 1868, // == B2YF*16384
RY15 = 9798, // == R2YF*32768 + 0.5
GY15 = 19235, // == G2YF*32768 + 0.5
BY15 = 3735, // == B2YF*32768 + 0.5
BLOCK_SIZE = 256
};

6
modules/imgproc/src/color_rgb.cpp
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@ -717,10 +717,10 @@ template<> struct RGB2Gray<uchar>
RGB2Gray(int _srccn, int blueIdx, const int* coeffs) : srccn(_srccn)
{
const int coeffs0[] = { R2Y, G2Y, B2Y };
const int coeffs0[] = { RY15, GY15, BY15 };
if(!coeffs) coeffs = coeffs0;
int b = 0, g = 0, r = (1 << (yuv_shift-1));
int b = 0, g = 0, r = (1 << (gray_shift-1));
int db = coeffs[blueIdx^2], dg = coeffs[1], dr = coeffs[blueIdx];
for( int i = 0; i < 256; i++, b += db, g += dg, r += dr )
@ -735,7 +735,7 @@ template<> struct RGB2Gray<uchar>
int scn = srccn;
const int* _tab = tab;
for(int i = 0; i < n; i++, src += scn)
dst[i] = (uchar)((_tab[src[0]] + _tab[src[1]+256] + _tab[src[2]+512]) >> yuv_shift);
dst[i] = (uchar)((_tab[src[0]] + _tab[src[1]+256] + _tab[src[2]+512]) >> gray_shift);
}
int srccn;
int tab[256*3];

8
modules/imgproc/src/opencl/color_rgb.cl
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@ -75,10 +75,14 @@
enum
{
gray_shift = 15,
yuv_shift = 14,
R2Y = 4899,
G2Y = 9617,
B2Y = 1868
B2Y = 1868,
RY15 = 9798, // == R2YF*32768 + 0.5
GY15 = 19235, // == G2YF*32768 + 0.5
BY15 = 3735 // == B2YF*32768 + 0.5
};
//constants for conversion from/to RGB and Gray, YUV, YCrCb according to BT.601
@ -129,6 +133,8 @@ __kernel void RGB2Gray(__global const uchar * srcptr, int src_step, int src_offs
DATA_TYPE_3 src_pix = vload3(0, src);
#ifdef DEPTH_5
dst[0] = fma(src_pix.B_COMP, B2YF, fma(src_pix.G_COMP, G2YF, src_pix.R_COMP * R2YF));
#elif defined(DEPTH_0)
dst[0] = (DATA_TYPE)CV_DESCALE(mad24(src_pix.B_COMP, BY15, mad24(src_pix.G_COMP, GY15, mul24(src_pix.R_COMP, RY15))), gray_shift);
#else
dst[0] = (DATA_TYPE)CV_DESCALE(mad24(src_pix.B_COMP, B2Y, mad24(src_pix.G_COMP, G2Y, mul24(src_pix.R_COMP, R2Y))), yuv_shift);
#endif

4
modules/objdetect/misc/java/test/CascadeClassifierTest.java
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@ -36,9 +36,9 @@ public class CascadeClassifierTest extends OpenCVTestCase {
Mat greyLena = new Mat();
Imgproc.cvtColor(rgbLena, greyLena, Imgproc.COLOR_RGB2GRAY);
Imgproc.equalizeHist(greyLena, greyLena);
// TODO: doesn't detect with 1.1 scale
cc.detectMultiScale(greyLena, faces, 1.09, 3, Objdetect.CASCADE_SCALE_IMAGE, new Size(30, 30), new Size());
cc.detectMultiScale(greyLena, faces, 1.1, 3, Objdetect.CASCADE_SCALE_IMAGE, new Size(30, 30), new Size());
assertEquals(1, faces.total());
}