DIGITAL VIDEO SIGNAL DECODING APPARATUS AND PRESUMED MOTION VECTOR CALCULATING METHOD

摘要

A digital video signal decoding apparatus has a memory (207) for storing motion vectors [Vx(n), Vy(n)] which have been decoded by a decoder (202), and a motion vector presuming circuit (208) for calculating a presumed motion vector from the motion vectors [Vx(n), Vy(n)] stored in the memory (207), whereby, even if a part of a bit stream has been lost and each of pixel blocks which have been lost accordingly cannot be decoded, each of the lost pixel blocks is replaced by a corresponding pixel block in the previous frame which has been motion-compensated through a motion compensation circuit (203) by using the presumed motion vector, thereby preventing degradation of the picture quality at that pixel block portion. <IMAGE>