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 multiple video bitstreams to achieve scalability, and the quality of the base layer is limited by drift. We propose a hybrid approach to eliminate 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 obtain the reconstructed services that have the minimum drift. Then, the encoder sends an additional drift correction signal, which is used to eliminate drift completely, to the decoder. In this way, the proposed approach can eliminate the drift completely and reduce the overhead required for the drift correction.