A hybrid approach with drift minimization and correction for a layered H.263 codec

Layered video coding allows the video information to be transmitted in mult iple video bitstreams to achieve scalability. And the quality of the base l ayer is limited by drift. In this paper, we propose a hybrid approach to el iminate the drift in an H.263-based video codec with two-layer scalability. The base layer decoder takes advantage of the minimal drift approach to ob tain the reconstructed services that have the minimum drift. Then, the enco der sends an additional drift correction signal, which is used to eliminate drift completely, to the decoder. In this way, the proposed approach can e liminate the drift completely and reduce the overhead required for the drif t correction.