Face detector and face detecting method

Abstract

A face detector includes a detection processor for detecting a facial image from a frame of a motion picture according to template matching by use of a parameter, or a window size and window shift of a window. A parameter controller assigns the detection processor with a predetermined normal variation range of the parameter, to carry out face detection of a first frame of the motion picture according to the normal variation range, determines a limited variation range smaller than the normal variation range according to at least one of a value of the parameter used for the face detection of the first frame and the facial image of the first frame. The detection processor is assigned with the limited variation range, to carry out face detection of a succeeding frame after the first frame of the motion picture according to the limited variation range.

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