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SIFT Feature Descriptor Doesn't Work With ORB Keypoinys

As stated in the title, SIFT Feature Descriptor doesn't work with ORB keypoints, I changed the useProvidedKeypoints to true but it still doesn't work and I get the "Vector subscript out of range" error in the extractor.compute line. Part of the code is below.

ORB detector(500);
detector.detect( img1, keypointsB );

SiftDescriptorExtractor extractor;
extractor.compute( img1, keypointsB, descriptorsB);