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This highly depends on what kind of matcher you use. For example bruteforce matching returns the hamming distance of those matched keypoints which equals numbers from 0 to infinity (actually limited by the length/bits of/in the descriptor). So there is no direct answer to your question if dont tell us what kind of matcher (and descriptor) you used.

This highly depends on what kind of matcher you use. For example bruteforce matching returns the hamming distance of those matched keypoints which equals integer numbers from 0 to infinity (actually limited by the length/bits of/in the descriptor). So there is no direct answer to your question if dont tell us what kind of matcher (and descriptor) you used.

This highly depends on what kind of matcher you use. For example bruteforce matching returns the hamming distance of those matched keypoints which equals integer numbers from 0 to infinity (actually limited by the length/bits of/in the descriptor). So there is no direct answer to your question if you dont tell us what kind of matcher (and descriptor) you used.