Patent ID: 6173069
Filing Date: 2001-01-09
Classification: G06K,G06T,H04N

Abstract:
A method of detecting a facial region within a video comprising the steps of:(a) receiving a first frame of said video comprising a plurality of pixels;(b) receiving a subsequent frame of said video comprising a plurality of pixels;(c) calculating a difference image representative of the difference between a plurality of said pixels of said first frame and a plurality of said pixels of said subsequent frame;(d) determining a plurality of candidate facial regions within said difference image based on a transform of said difference image in a spacial domain to a parameter space, wherein said transform is a Hough transform ofA(x.sub.c,y.sub.c,r)=A(x.sub.c,y.sub.c,r)+1.A-inverted.x.sub.c,y.sub. c,r.epsilon.(x-x.sub.c).sup.2 +(y-y.sub.c).sup.2 =r.sup.2 ; and(e) fitting said plurality of candidate facial regions to said difference image to select one of said candidate facial regions.