Resource leak in all example programs

[fpiette]

I see that every example program suffer from a resource leak.

I see this leak using madExcept which report a thread handle leak. See attached madExcept report created when running example cv_GoodFeaturesToTrack.dproj :

In that sample, the line (62) allocating the leaked thread handle is calling cvCvtColor. I guess the function create a thread to do the conversion.

I suspect that something is missing in the example program to finalize OpenCV and free all resources.

btw: I'm using Delphi 10.3.1.

François Piette Embarcadero MVP

[Laex]

Preliminary conclusion

Example: cv_GoodFeaturesToTrack Code modification:

While True do
begin
  ipar1 := 100;
  img1 := cvLoadImage(ImgFilename, CV_LOAD_IMAGE_UNCHANGED);
  img2 := cvCreateImage(cvGetSize(img1), IPL_DEPTH_8U, 1);
  cvCvtColor(img1, img2, CV_RGB2GRAY);
  eig := cvCreateImage(cvGetSize(img2), 32, 1);
  temp := cvCreateImage(cvGetSize(img2), 32, 1);
  points[0] := @pointsRow1[0];
  count := 250;
  cvGoodFeaturesToTrack(img2, eig, temp, @points[0][0], @ipar1, 0.05, 10, nil, 5, 0, 0.09);
  cvFindCornerSubPix(img2, @points[0][0], count, cvSize(5, 5), cvSize(-1, -1), cvTermCriteria(CV_TERMCRIT_ITER or CV_TERMCRIT_EPS, 20, 0.03));
  for j := 0 to ipar1 - 1 do
  begin
    cvCircle(img1, cvPointFrom32f(points[0][j]), 3, CV_RGB(0, 255, 255), -1, 8, 0);
    cvCircle(img1, cvPointFrom32f(points[0][j]), 8, CV_RGB(255, 0, 0), -1, 8, 0);
  end;
  cvNamedWindow('bb', 1);
  cvShowImage('bb', img1);
  cvWaitKey(1);
  cvReleaseImage(img1);
  cvReleaseImage(img2);
  cvReleaseImage(eig);
  cvReleaseImage(temp);
  cvDestroyAllWindows;
end;

Result:

Conclusion: A memory leak occurs outside of opencv.

[fpiette]

@Laex I was talking about a HANDLE leak, not a memory leak.