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How freak\sift\surf verify tow images

Hi everyone, When I'm using keypoints matching, like freak\sift\surf. How does it verify tow images the same? I want use keypoints matching on Face Recognizer. Or it can not use on Face Recognizer?

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How freak\sift\surf do FREAK\SIFT\SURF verify tow imagesthat two images are the same

Hi everyone, When I'm using keypoints matching, with descriptors like freak\sift\surf. How does it verify tow that two images are the same? I want to use keypoints matching on in Face Recognizer. Or may be it can not use on Face Recognizer? is a bad idea?