OpenCV 描述符删除关键点

Question

OpenCV 2.4 具有检测器和描述符。我正在为很多图像创建关键点，问题是检测器获取了关键点，但描述符有时会将它们全部删除。

• 如何禁止描述符删除点？
• 有没有办法增强关键点，使它们不被删除？

知道我尝试了很多描述符（SIFT、SURF、BRIEF 等......）

Answer 1

你能发布一些代码吗？可以在名为 matcher_simple.cpp 的 samples/cpp 文件夹中找到 CPU 实现。你能运行它吗？我还在 OpenCV 上运行了 SURF 的 GPU 版本，使用没有问题：

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);