third_party/opencv
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Rewite polar transforms (#11323)

Browse Source 
* Rewrite polar transformations

- A new wrapPolar function encapsulate both linear and semi-log remap
- Destination size is a parameter or calculated automatically to keep objects size between remapping
- linearPolar and logPolar has been deprecated

* Fix build warning and error in accuracy test

* Fix function name to warpPolar

* Explicitly specify the mapping mode, so we retain all the parameters as non-optional.

Introduces WarpPolarMode enum to specify the mapping mode in flags

* resolves performance warning on windows build

* removed duplicated logPolar and linearPolar implementations
This commit is contained in:
Vadim Pisarevsky
2018-04-17 15:50:52 +03:00
committed by GitHub
parent e0fef2bca1
commit b8b7ca7302
8 changed files with 2589 additions and 3123 deletions
Download Patch File Download Diff File Expand all files Collapse all files
samples/cpp/polar_transforms.cpp
+63 -14
View File
@@ -43,33 +43,82 @@ int main( int argc, char** argv )
moveWindow( "Log-Polar", 700,20 );
moveWindow( "Recovered Linear-Polar", 20, 350 );
moveWindow( "Recovered Log-Polar", 700, 350 );
int flags = INTER_LINEAR + WARP_FILL_OUTLIERS;
Mat src;
for(;;)
{
Mat frame;
capture >> frame;
capture >> src;
if( frame.empty() )
if(src.empty() )
break;
Point2f center( (float)frame.cols / 2, (float)frame.rows / 2 );
double M = 70;
Point2f center( (float)src.cols / 2, (float)src.rows / 2 );
double maxRadius = 0.7*min(center.y, center.x);
logPolar(frame,log_polar_img, center, M, INTER_LINEAR + WARP_FILL_OUTLIERS);
linearPolar(frame,lin_polar_img, center, M, INTER_LINEAR + WARP_FILL_OUTLIERS);
#if 0 //deprecated
double M = frame.cols / log(maxRadius);
logPolar(frame, log_polar_img, center, M, flags);
linearPolar(frame, lin_polar_img, center, maxRadius, flags);
logPolar(log_polar_img, recovered_log_polar, center, M, WARP_INVERSE_MAP + INTER_LINEAR);
linearPolar(lin_polar_img, recovered_lin_polar_img, center, M, WARP_INVERSE_MAP + INTER_LINEAR + WARP_FILL_OUTLIERS);
logPolar(log_polar_img, recovered_log_polar, center, M, flags + WARP_INVERSE_MAP);
linearPolar(lin_polar_img, recovered_lin_polar_img, center, maxRadius, flags + WARP_INVERSE_MAP);
#endif
//! [InverseMap]
// direct transform
warpPolar(src, lin_polar_img, Size(),center, maxRadius, flags); // linear Polar
warpPolar(src, log_polar_img, Size(),center, maxRadius, flags + WARP_POLAR_LOG); // semilog Polar
// inverse transform
warpPolar(lin_polar_img, recovered_lin_polar_img, src.size(), center, maxRadius, flags + WARP_INVERSE_MAP);
warpPolar(log_polar_img, recovered_log_polar, src.size(), center, maxRadius, flags + WARP_POLAR_LOG + WARP_INVERSE_MAP);
//! [InverseMap]
imshow("Log-Polar", log_polar_img );
imshow("Linear-Polar", lin_polar_img );
// Below is the reverse transformation for (rho, phi)->(x, y) :
Mat dst;
if (flags & WARP_POLAR_LOG)
dst = log_polar_img;
else
dst = lin_polar_img;
//get a point from the polar image
int rho = cvRound(dst.cols * 0.75);
int phi = cvRound(dst.rows / 2.0);
//! [InverseCoordinate]
double angleRad, magnitude;
double Kangle = dst.rows / CV_2PI;
angleRad = phi / Kangle;
if (flags & WARP_POLAR_LOG)
{
double Klog = dst.cols / std::log(maxRadius);
magnitude = std::exp(rho / Klog);
}
else
{
double Klin = dst.cols / maxRadius;
magnitude = rho / Klin;
}
int x = cvRound(center.x + magnitude * cos(angleRad));
int y = cvRound(center.y + magnitude * sin(angleRad));
//! [InverseCoordinate]
drawMarker(src, Point(x, y), Scalar(0, 255, 0));
drawMarker(dst, Point(rho, phi), Scalar(0, 255, 0));
#if 0 //C version
CvMat src = frame;
CvMat dst = lin_polar_img;
CvMat inverse = recovered_lin_polar_img;
cvLinearPolar(&src, &dst, center, maxRadius, flags);
cvLinearPolar(&dst, &inverse, center, maxRadius,flags + WARP_INVERSE_MAP);
#endif
imshow("Src frame", src);
imshow("Log-Polar", log_polar_img);
imshow("Linear-Polar", lin_polar_img);
imshow("Recovered Linear-Polar", recovered_lin_polar_img );
imshow("Recovered Log-Polar", recovered_log_polar );
if( waitKey(10) >= 0 )
break;
}
waitKey(0);
return 0;
}