Distributed video coding(DVC) is a new video compression paradigm based on two key information theories:Slepian-Wolf and Wyner-Ziv theorems

and it has the advantage of very lightweight encoder

high compression efficiency and inbuilt robustness.In this paper

pixel-domain Wyner-Ziv video algorithm

which is a typical DVC scheme

is analyzed at first.Then a performance improved method for pixel-domain Wyner-Ziv video coding system is presented.The proposed method

without sacrificing the encoder complexity

can calculate high quality side information using bi-directional motion estimation and reconstruct decoding frames using side information by joint iteration function based on Huber-Markov random field.Simulation results show that a better visual quality and 2dB average gain of Power Signal-to-Noise Ratio (PSNR) can be achieved with the proposed method at the decoder.