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answered Nov 16 '12

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You should have a look at this paper:
Scalable near identical image and shot detection
O. Chum, J. Philbin, M. Isard, A. Zisserman, CIVR 2007

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You should have a look at this paper:
Scalable near identical image and shot detection
O. Chum, J. Philbin, M. Isard, A. Zisserman, CIVR 2007

It uses locality-sensitive hashing and min-hashing to index/find near-duplicates in image databases. But beware: these hashing methods are essentially a nearest-neighbour search and not comparable to traditional hashing at all!