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Yes, it uses 512 bit descriptors. Unfortunately, you can not use the cascade hamming-distance format for the BFMatcher out of the box, since OpenCV doesn't allow (anymore) the use of own distance functions. So, if you want to use the cascade-one, which you can get from the author's github page (https://github.com/kikohs/freak/tree/master/src), you would either need to modify OpenCV's BFMatcher (i.e. define own norm-funciton etc.), or write your own Matcher. I'd try simple Hamming-Distance first, you should get comparable results.
