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logPolar/linearPolar: more accurate processing near zero angle slice

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This commit is contained in:
Alexander Alekhin 2016-03-03 18:34:02 +03:00
parent 275bfcf99c
commit ec66a3700f
1 changed files with 25 additions and 9 deletions
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34
modules/imgproc/src/imgwarp.cpp
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@ -50,6 +50,8 @@
#include "precomp.hpp"
#include "opencl_kernels_imgproc.hpp"
using namespace cv;
namespace cv
{
#if IPP_VERSION_X100 >= 710
@ -6475,11 +6477,13 @@ CV_IMPL void
cvLogPolar( const CvArr* srcarr, CvArr* dstarr,
CvPoint2D32f center, double M, int flags )
{
Mat src_with_border; // don't scope this variable (it holds image data)
cv::Ptr<CvMat> mapx, mapy;
CvMat srcstub, *src = cvGetMat(srcarr, &srcstub);
CvMat dststub, *dst = cvGetMat(dstarr, &dststub);
CvSize ssize, dsize;
CvSize dsize;
if( !CV_ARE_TYPES_EQ( src, dst ))
CV_Error( CV_StsUnmatchedFormats, "" );
@ -6487,7 +6491,6 @@ cvLogPolar( const CvArr* srcarr, CvArr* dstarr,
if( M <= 0 )
CV_Error( CV_StsOutOfRange, "M should be >0" );
ssize = cvGetMatSize(src);
dsize = cvGetMatSize(dst);
mapx.reset(cvCreateMat( dsize.height, dsize.width, CV_32F ));
@ -6522,6 +6525,13 @@ cvLogPolar( const CvArr* srcarr, CvArr* dstarr,
}
else
{
const int ANGLE_BORDER = 1;
Mat src_ = cv::cvarrToMat(src);
cv::copyMakeBorder(src_, src_with_border, ANGLE_BORDER, ANGLE_BORDER, 0, 0, BORDER_WRAP);
srcstub = src_with_border; src = &srcstub;
CvSize ssize = cvGetMatSize(src);
ssize.height -= 2*ANGLE_BORDER;
int x, y;
CvMat bufx, bufy, bufp, bufa;
double ascale = ssize.height/(2*CV_PI);
@ -6558,7 +6568,7 @@ cvLogPolar( const CvArr* srcarr, CvArr* dstarr,
double phi = bufa.data.fl[x]*ascale;
mx[x] = (float)rho;
my[x] = (float)phi;
my[x] = (float)phi + ANGLE_BORDER;
}
#else
for( x = 0; x < dsize.width; x++ )
@ -6599,11 +6609,13 @@ CV_IMPL
void cvLinearPolar( const CvArr* srcarr, CvArr* dstarr,
CvPoint2D32f center, double maxRadius, int flags )
{
Mat src_with_border; // don't scope this variable (it holds image data)
cv::Ptr<CvMat> mapx, mapy;
CvMat srcstub, *src = (CvMat*)srcarr;
CvMat dststub, *dst = (CvMat*)dstarr;
CvSize ssize, dsize;
CvSize dsize;
src = cvGetMat( srcarr, &srcstub,0,0 );
dst = cvGetMat( dstarr, &dststub,0,0 );
@ -6611,10 +6623,7 @@ void cvLinearPolar( const CvArr* srcarr, CvArr* dstarr,
if( !CV_ARE_TYPES_EQ( src, dst ))
CV_Error( CV_StsUnmatchedFormats, "" );
ssize.width = src->cols;
ssize.height = src->rows;
dsize.width = dst->cols;
dsize.height = dst->rows;
dsize = cvGetMatSize(dst);
mapx.reset(cvCreateMat( dsize.height, dsize.width, CV_32F ));
mapy.reset(cvCreateMat( dsize.height, dsize.width, CV_32F ));
@ -6643,6 +6652,13 @@ void cvLinearPolar( const CvArr* srcarr, CvArr* dstarr,
}
else
{
const int ANGLE_BORDER = 1;
Mat src_ = cv::cvarrToMat(src);
cv::copyMakeBorder(src_, src_with_border, ANGLE_BORDER, ANGLE_BORDER, 0, 0, BORDER_WRAP);
srcstub = src_with_border; src = &srcstub;
CvSize ssize = cvGetMatSize(src);
ssize.height -= 2*ANGLE_BORDER;
int x, y;
CvMat bufx, bufy, bufp, bufa;
const double ascale = ssize.height/(2*CV_PI);
@ -6674,7 +6690,7 @@ void cvLinearPolar( const CvArr* srcarr, CvArr* dstarr,
double rho = bufp.data.fl[x]*pscale;
double phi = bufa.data.fl[x]*ascale;
mx[x] = (float)rho;
my[x] = (float)phi;
my[x] = (float)phi + ANGLE_BORDER;
}
}
}