Effect of a priori information in pixel domain Wyner-Ziv video coding

Distributed video coding (DVC) is an interesting research topic for emerging application scenarios requiring low complexity video encoding. The central Slepian-Wolf (SW) coding, in a DVC system, exploits the cross correlation between the side information and the original frame. But, it does not exploit the source entropy of the input symbols, which is exploited by entropy coding in conventional video transmission systems. It is shown, that the SW coding performance is significantly reduced in case of reduced source entropy (non-uniformly distributed symbols). We propose two algorithms, which adjust the SW coding to the source entropy. Thus, the SW coding performance is increased by 16% and the overall rate distortion performance, of the proposed DVC system, is increased by up to 0:82 dB. Furthermore, the low encoding complexity is preserved.