The head in a series of video images is identified by digitizing sequential images, subtracting a previous image from an input image to determine moving objects, calculating boundary curvature extremes of regions in the subtracted image, comparing the extremes with a stored model of a human head to find...http://www.google.com.tw/patents/US5987154?utm_source=gb-gplus-share專利 US5987154 - Method and means for detecting people in image sequences
