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  • Maybe you need some techniques like Google image search. petapixel.com/2013/06/13/… Commented Mar 14, 2014 at 9:21
  • @gloompisces can you explain how this algorithm works ? Commented Mar 14, 2014 at 9:33
  • In fact, I do not know the detail about the algorithm (that's why I only comment here instead answering your question below). As far as I know, Google first reduces an image to a 64 x 64 gray-scale image. Then compares with other images in its data set (Please correct me if I am wrong). Maybe this link helps. Good luck Commented Mar 17, 2014 at 2:18
  • possible duplicate of Simple and fast method to compare images for similarity Commented Mar 20, 2014 at 12:09