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2013-03-26 05:46:18 -0600	commented answer	feature 2d: Feature Matching fails with assert (stat.cpp) I see. I had obtained the list of possible descriptors from: http://docs.opencv.org/modules/features2d/doc/common_interfaces_of_feature_detectors.html No FREAK is listed. Going to see if the "common interfaces of feature detectors" also accepts this one. Thanks again.
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2013-03-25 11:44:48 -0600	commented answer	feature 2d: Feature Matching fails with assert (stat.cpp) @Guranta, Thanks for the explanation. I am new to this so I won't risk experimenting with changes. I will do as you suggested an stick to L2 (BruteForce and FlannBased). BTW, is that "FREAK" a typo?
2013-03-25 08:58:48 -0600	asked a question	feature 2d: Feature Matching fails with assert (stat.cpp) Hello, I have tried to use all combinations of feature detectors, extractors and matchers. I have found that certain combinations are not allowed. These are detected and an exception thrown during runt-time. However certain combinations generate this error: OpenCV Error: Assertion failed ((type == CV_8U && dtype == CV_32S) \|\| dtype == CV_32F) in batchDistance, file /home/hugof/projects/recommender/opencv2.4/opencv-2.4.4/modules/core/src/stat.cpp, line 1810 terminate called after throwing an instance of 'cv::Exception' what(): /home/hugof/projects/recommender/opencv2.4/opencv-2.4.4/modules/core/src/stat.cpp:1810: error: (-215) (type == CV_8U && dtype == CV_32S) \|\| dtype == CV_32F in function batchDistance Of the total 1650 combinations, 169 fail with this exception (other exceptions occur in with other combinations also). My question is: is this solvable? If so, how may I solve it? (Images are loaded and converted to grey scale 8UC3). I can make the source code available (test images are in the examples, matching_to_many_images/query.png and train*.png) but basically I copied an example in the tutorials. As an example I show some combinations that fail (see end of message, -d descriptor type, -e extractor, -m for the matcher). I can also send a text file with all 169 combinations. Appreciate any help. TIA, Hugo F. option -d : GridSURF option -e : SURF option -m : BruteForce-Hamming(2) option -d : GridSURF option -e : SURF option -m : BruteForce-Hamming option -d : GridSURF option -e : OpponentSURF option -m : BruteForce-Hamming(2)