"Questionable Observer Detector" identifies people who keep popping up in crime scene footage

Chances are, you’ve seen at least one or two TV shows in which the police examine news footage shot at several different crime scenes, and recognize the same person’s face showing up repeatedly in the crowds of onlookers ... the ol’ “criminal returning to the scenes of their crimes” scenario. Realistically, it’s pretty hard to believe that one person could look through all that footage, and remember all those faces. It turns out that a computer could do it, however, as scientists at Indiana’s University of Notre Dame have illustrated with their “Questionable Observer Detector," or QuOD.

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