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Using hash for detecting similar images is not a very popular approach. Actually the paper you mentioned really surprised me, because normally hash functions can't be used for estimation of image similarity. Are you searching specifically for hashing, or anything that allows you to compare images is good? There many ways to find similar images based on comparison of color histograms. Or if your tasks is simple enough maybe even comparing average intensities will do the trick.

Using hash for detecting similar images is not a very popular approach. Actually the paper you mentioned really surprised me, because normally hash functions can't be used for estimation of image similarity. Are you searching specifically for hashing, or anything that allows you to compare images is good? There many ways to find similar images based on comparison of color histograms. Or if your tasks is simple enough maybe even comparing average intensities will do the trick.