2018-09-12 00:03:33 -0600 | received badge | ● Popular Question (source) |
2017-03-14 01:49:12 -0600 | commented question | Segfault in multithreaded cuda::HOG::compute calls I face the same issue with ORB. Although I am using detectAndComputeAsync along with CUDA streams, when I try to perform multi-threaded detect, it crashes with similar errors. |
2015-06-28 15:55:53 -0600 | received badge | ● Student (source) |
2014-05-28 18:59:42 -0600 | commented question | Flann descriptor save and load doesn't work Linked bug and temporary fix: http://code.opencv.org/issues/3720 |
2014-05-28 12:24:13 -0600 | commented question | Flann descriptor save and load doesn't work Yes I agree. That was another issue with this API. How can they expect user to know the size of Mat without loading that file. The API should take care of this. Temporary fix is : |
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2014-05-27 16:27:28 -0600 | received badge | ● Editor (source) |
2014-05-27 16:26:53 -0600 | asked a question | Flann descriptor save and load doesn't work void testSaveAndLoad(Mat descriptors, string outputFile) { vector<string> images; flann::LshIndexParams lshIndexParams(20,10,2); flann::Index kdtree(descriptors, lshIndexParams, cvflann::FLANN_DIST_HAMMING); cout << "outputting index file to disk: " << "\n"; // just to check whether loaded ones are same or similar writeMatToFile(descriptors, "before_save.dat"); kdtree.save(outputFile); // saving done .. now load Mat mat = Mat(descriptors.rows, descriptors.cols, CV_8UC1); // read saved indices flann::Index kdtree1(mat, flann::SavedIndexParams(outputFile), cvflann::FLANN_DIST_HAMMING); writeMatToFile(mat, "after_save.dat"); cout << "Loaded mat of size " << mat.rows << " " << mat.cols << "\n"; // prepare to output indices and distances Mat indices = Mat(descriptors.rows, 2, CV_32S); Mat dists = Mat(descriptors.rows, 2, CV_32S); kdtree1.knnSearch(descriptors, indices, dists, 2); } before_save.dat: %YAML:1.0 mat: !!opencv-matrix rows: 6342 cols: 61 dt: u data: [ 1, 0, 140, 7, 1, 238, 55, 0, 0, 0, 0, 0, 0, 0, 0, 128, 25, 122, 134, 6, 0, 0, 240, 248, 227, 1, 3, 227, 249, 255, 62, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 24, 0, 0, 128, 48, 230, 15, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 128, 25, 59, 243, 51, 6, 16, 64, 252, 255, 199, 16, 255, 7, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 4, 0, 6, 0, 60, 0, 0, 0, 0, 0, 0, 0, 0, 192, 14, 160, 3, 112, 0, 7, 16, 0, 0, 0, 0, 0, 0, 254, 63, ......... after_save.dat: %YAML:1.0 mat: !!opencv-matrix rows: 6342 cols: 61 dt: u data: [ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, ....... And knnSearch throws segfaults during the matching. Thanks |
2014-05-27 01:14:43 -0600 | asked a question | Flann indexing multiple descriptors and saving in file Hello, I am trying to use flann to create a database of large set of descriptors and later querying it for image search. I find it really weird that I have to create a super mat (all descriptor mat's concatenated using vconcat. The problems are many:
Anyone who has worked on opencv flann, storing and loading from disk, with multiple images, and mapping descriptors back to original image ? Sample codes: |
2014-03-31 03:23:24 -0600 | answered a question | failed to make opencv.git with gcc48 on macosx mavericks I am also facing this problem.. anyone with a solution? .. Can anyone post steps to compile Opencv 2.4.8 with 10.9 OSX and gcc 4.8 |