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    You'll have to describe your constraints slightly better. Is a 90-degree rotation of an image "close"? Commented Jul 21, 2011 at 7:28
  • Here is an article on how TinEye works. Although, you can modify some steps since you aren't comparing against thousands of images. hackerfactor.com/blog/index.php?/archives/… Commented Jul 22, 2011 at 13:58