The OpenCV distribution contains several xml files describing classifier cascades for frontal face detection. Can anyone tell us what database(s) and methodology were used to train and test them? Specifically, I am thinking about haarcascade_frontalface_alt.xml, haarcascade_frontalface_alt2.xml, haarcascade_frontalface_default.xml, and lbpcascade_frontalface.xml.
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