Reviews of weighted hashing methods

Hashing methods for image retrieval map image features to binary codes, and perform image search by the hamming ranking. Since hamming distances are discrete values, they can not perform fine-grained search for the large amount images sharing the same distances. Some hashing methods try to tackle this drawback, and propose to learn weights for different hashing functions or codes. Till now, several methods have been proposed, I’ll briefly summarize them.

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