Alex Rivera | Logout

Image similarity comparison

Asked 2011-04-20T05:34:06.987
47

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

enter image description here enter image description here enter image description here

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

enter image description here enter image description here

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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If you just want image similarity that's one thing, but facial similarity is quite another. Two very different individuals could appear in the same background and an analysis of image similarity show them to be the same while the same person could be shot in two different settings and the similarity analysis show them to be different.

If you need to do facial analysis you should search for algorithms specific to that. Calculating relative eye, nose and mouth size and position is often done in this kind of analysis.

answered 2011-04-21T02:49:23.850

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