Bandwidth Reduction Via Movement Compensation on a Model of the Random Video Process

The video-signal bandwidth reduction obtained by interframe differential transmission is hindered by rapid movements of the objects and the camera. A simple movement compensation procedure can be obtained by dividing the image into zones and then transmitting for each zone a displacement vector relating the zone to a zone in the previous flame that is maximally correlated with it. The effectiveness of such a procedure is studied on a model of the random video process, obtained as a derivation of a three-dimensional telegraph signal. In particular, it is shown that for this model, the optimal procedure for finding the most correlated zone in the previous frame is the one matching the intersections of the contour lines. The optimal size of the zone for which a single displacement vector has to be transmitted is also determined.