Bi-directional motion vector coding using Universal VLC

摘要

In this paper an error resilient motion vector coding which employs two-way decodable Universal VLC is presented. With this scheme, a part of a bitstream which cannot be decoded in the forward direction due to errors can be recovered by backward decoding. Based on the observation that motion compensated signals are visually more important than residual signals, motion vectors are better protected so that they can be recovered even in the presence of errors. Besides being bi-directionally decodable, Universal VLC has been designed to allow easy encoding and decoding. It has been shown through simulations that the proposed scheme outperforms the conventional method (i.e, non-bi-directional) in terms of PSNR under various error conditions.