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Face recognition at a distance is a challenging and important law-enforcement surveillance problem, with low image resolution and blur contributing to the difficulties. We present a method for combining a sequence of video frames of a subject in order to create a restored image of the face with reduced blur. A generic Active Appearance Model of face shape and appearance is used for registration. By warping and averaging registered video frames, noise is reduced, allowing a Wiener filter to deblur the face to a greater degree than can be achieved on a single video frame. This process is theoretically justified and tested with real-world outdoor video using a PTZ camera and a commercial face recognition engine. Improvement is demonstrated for both face recognition and authentication. 1.
Wheeler et al. (Sun,) studied this question.