OpenCV is the open source library used to perform Computer Vision tasks. The following links would be very helpful if you are looking to do face detection and optical flow in OpenCV.
Face Detection : http://www710.univ-lyon1.fr/~bouakaz/OpenCV-0.9.5/docs/ref/OpenCVRef_Experimental.htm
Optical Flow : http://robotics.stanford.edu/~dstavens/cs223b/
Tags: computer vision, face detect, opencv, optical flow
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