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Matching Binary Kepoints, HAMMING2

When using BFMatcher match() function, does it give vector of Matches in sorted order.

And what is NORM_HAMMING2.

I just understand NORM_HAMMING for e.g when comparing 2 byte (10000000B vs 01111110B) because only last bits of 2 bytes are the same. Is this right? And how about NORM_HAMMING2?

How to specify the radius using radiusMatch() for HAMMING distance?

Matching Binary Kepoints, HAMMING2

When using BFMatcher match() function, does it give vector of Matches in sorted order.

And what is NORM_HAMMING2.

I just understand NORM_HAMMING for e.g when comparing 2 byte (10000000B (01111111B vs 01111110B) because only last bits of 2 bytes are the same. different. Is this right? And how about NORM_HAMMING2?

How to specify the radius using radiusMatch() for HAMMING distance?