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PhotoDNA[0], for the ones interested in knowing a little bit more [0] http://en.wikipedia.org/wiki/PhotoDNA http://en.wikipedia.org/wiki/PhotoDNA

• onewaystreet 12y ago
  Anyone know of a similar technology (generating a hash from an image that is resistant to alterations) that is open source?
  • krapp 12y ago
    If you don't mind php, I wrote this ages ago specifically to catch image spam on forums... the project is more or less dead now because i'm not technically capable of improving it, but it does work (albeit with false positives in some instances): https://github.com/kennethrapp/phasher https://github.com/kennethrapp/phasher You may find the actual algorithm used more interesting (http://phash.org/ http://phash.org/)
  • troels 12y ago
    I'm fairly sure [OpenCV](http://opencv.org http://opencv.org) can do that for you.