Robust transmission of video sequence using double-vector motion compensation

This paper proposes a motion-compensation (MC) algorithm for robust transmi ssion of video sequence, called the double-vector motion compensation (DMC) . In the DMC, each block B in a frame is predicted from the weighted superp osition of two blocks in the previous two frames, using two motion vectors. Therefore, when one of these two blocks is corrupted during the transmissi on, the decoder can efficiently suppress its error propagation to the subse quent frames, by predicting B only from the other block. It is shown by ana lysis that the DMC algorithm yields significantly lower error bounds for th e subsequent frames than the conventional MC technique. Furthermore, the DM C algorithm can be combined with an effective concealment algorithm, which is capable of recovering very severe transmission errors, such as loss of a n entire frame. A complete video coder, based on the DMC, is implemented by modifying the MC syntax of the H.263 standard and tested intensively in re alistic error prone environment. It is shown that the proposed algorithm pr ovides much better objective and subjective performances than the H.263 cod er in the error-prone environment.