Wyner-Ziv coding for video: applications to compression and error resilience

Abstract

Two separate applications of Wyner-Ziv coding of motion video coding are considered. The Wyner-Ziv theorem on source coding with side information available only at the decoder suggests that an asymmetric video codec, where individual frames are encoded separately, but decoded conditionally could achieve efficiency comparable to current interframe video compression systems. First results on the Wyner-Ziv coding scheme for motion video are reported that use interframe encoding, but interframe decoding. Secondly, Wyner-Ziv coding for the transmission of compressed video over an error-prone channel is applied. This coding scheme is used to generate a supplementary bit stream, which contains a coarsely quantized representation of the transmitted video signal. Using the conventionally decoded, error-concealed video signal as side information to decode the Wyner-Ziv bits, the transmission errors in the decoded video waveform are corrected up to a certain residual distortion, significantly improving the visual quality of the decoded video.