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I did a series of tests of iPhoto’s facial recognition capabilities to determine what it can and cannot recognize as a face. It only tracks human faces, so I wanted to find the limit of what the software considers to be human. You can read details in the PDF, but essentially I found that it can see anything that looks like real human face, and not anything else. So chimpanzees that look a little less human than others do not not get recognized, and neither do cartoon characters. My favorite moment in the test was when it identified a friend of mine as possibly being in a photo that in fact contained no faces; it thought his face was found in some branches in front of the sky (image above).

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