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Alex Rivera
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I originally asked this question on cstheory.stackexchange.com but was suggested to move it to stats.stackexchange.com . Is there an existing algorithm that returns to me a similarity metric between two bitmap images? By "similar", I mean a human would say these two images were altered from the same photograph. For example, the algorithm should say the following 3 images are the same (original, position shifted, shrunken). Same I don't need to detect warped or flipped images. I also don't need to detect if it's the same object in different orientations. Different I would like to use this algorithm to prevent spam on my website. I noticed that the spammers are too lazy to change their spam images. It's not limited to faces. I already know there's already many great facial recognition algorithms out there. The spam image could be anything from a URL to a soccer field to a naked body.
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