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Since SIFT and SURF return a detectorType() of CV32F (=float) you cannot use any Hamming-distance as matcher. Hamming-distance works only for binary feature-types like ORB, FREAK, ... I guess it would be possible if you'd convert them to CV8U. Afaik for SIFT this should be fairly easy since they are actually already normalized for the range 0-255 (double check that before you do it). However, I doubt that this is useful at all, use L2 norm for those and you should be fine.