Computer Detection and Tracking of Moving People in Television Images/sup 1/
S. Riter, A. Bernat, Dierk F. Schroder · 2005
An important area of computer vision is the detection and tracking of moving people in television images. This paper descr ibes the development of a computer vision system which can detect and track human motion across the international border between the United States and Mexico. The system consists of 16 parallel microprocessors which each operate on a segment of the total video image to determine if there has been motion in that segment of the image. Motion is detected based upon a novel scheme for calculating the median pixel value in the segment and comparing it with the median value from an earlier frame. Motion is detected if the median varies by more than a predetermined amount. When this happens a bit is sent to a controlling CPU. Also, each segment exchanges information with its neighbors thereby improving its ability to track the motion of a person. The paper also describes a practical realization of the design and problems associated with its use in a practical security system.