由于基于理想反馈重传策略的分布式视频编码方案非实际可行的系统；另外，由于边信息和分布式帧之间的近似度对分布式视频压缩效率影响较大，但相关研究较少，为此，为了研究切实可行的分布式视频编码系统，通过统计分析边信息与分布式帧的相似度，提出了一种基于PSNR的半反馈分布式视频编码方案。为满足无反馈信道的应用场合，进一步提出了基于PSNR的单向分布式视频编码方案。实验结果表明，该方案在编码复杂度增加不大的条件下，不仅切实可行，同时有效地降低了译码复杂度，且能灵活控制传输码率，但视频解码质量稍逊于理想的反馈重传分布式视频编码。

Distributed video coding(DVC) based on ideal ARQ is unrealistic. And little attention has been paid to the correlation between side information and distributed frames which has large influence on the compression performance. In this paper，through statistical analysis of the similarity between side information and distributed frames，a PSNR-based semi-feedback DVC is proposed. In order to fulfill the applications without using feedback channels, a PSNR-based unidirectional DVC is proposed too. Simulation results demonstrate that，the performances of semi-feedback and unidirectional DVC based on PSNR can significantly reduce decoding complexity，and are practical as well as flexible to control rates，while almost maintaining the same encoding complexity. But the decoded video quality is a little inferior to the ideal ARQ DVC.