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My target platform is Mac OS X, but I'm looking for a library that will give me a 2D coordinate of someone's head, via the built in webcam. My requirements are that it be near real time if not real time, give me a 2d screen coordinate I can write out to a log.

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up vote 1 down vote accepted

Here is a list of options for face detection software:

The first thing that came to mind is using OpenCV:

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