Patent ID: 6307970
Filing Date: 2001-10-23
Classification: H03M,H04N

Abstract:
In a compression system that compresses data groups in a dependent image frame such that each data group can be reconstructed from other data from an anchor frame based on a motion vector and a pixel difference representation, an improvement comprising:in compressing a current data group, if motion vector and pixel difference data is available for already-motion-compensated neighbor data groups, then for at least one neighbor data group, calculating a measure of pixel differences and comparing that measure to a threshold;in response to the comparison, employing a shortcut for motion compensating the current data group based upon compression information for at least one already-compensated neighbor data group if the threshold bears a predetermined relation to the measure of pixel differences; andemploying a default motion compensation strategy for the current data group if threshold does not bear the predetermined relation to the measure of pixel differences.