OpenCV handle deletes a cue point

Question

OpenCV 2.4 has a detector and a descriptor. I create key points for a large number of images, and the problem is that the detector receives the key points, but the handle sometimes removes all of them.

• How to disconnect a handle from deleting points?
• Is there a way to improve key points so that they are not deleted?

Knowing that I have tried many descriptors (SIFT, SURF, BRIEF, etc.)

Answer 1

Can you post the code? A CPU implementation can be found in the samples / cpp folder called matcher_simple.cpp. Can you run it? I also ran the SURF GPU version on OpenCV with no problems using:

SURF_GPU surf(1000, 4, 2, false, 0.5); // detecting keypoints & computing descriptors GpuMat keypoints1GPU, keypoints2GPU; GpuMat descriptors1GPU, descriptors2GPU; surf(img1, GpuMat(), keypoints1GPU, descriptors1GPU); surf(img2, GpuMat(), keypoints2GPU, descriptors2GPU); cout << "FOUND " << keypoints1GPU.cols << " keypoints on first image" << endl; cout << "FOUND " << keypoints2GPU.cols << " keypoints on second image" << endl; // matching descriptors BruteForceMatcher_GPU< L2<float> > matcher; GpuMat trainIdx, distance; matcher.matchSingle(descriptors1GPU, descriptors2GPU, trainIdx, distance); // downloading results vector<KeyPoint> keypoints1, keypoints2; vector<float> descriptors1, descriptors2; vector<DMatch> matches; surf.downloadKeypoints(keypoints1GPU, keypoints1); surf.downloadKeypoints(keypoints2GPU, keypoints2); surf.downloadDescriptors(descriptors1GPU, descriptors1); surf.downloadDescriptors(descriptors2GPU, descriptors2); BruteForceMatcher_GPU< L2<float> >::matchDownload(trainIdx, distance, matches); // drawing the results Mat img_matches, image1, image2; img1.download(image1); img2.download(image2); drawMatches(image1, keypoints1, image2, keypoints2, matches, img_matches);