关键词: 多描述编码, 差错隐藏, 等级树集分割编码 

Abstract: In this paper, the MD-SPIHT algorithm was extended to video sequence, and a combat channel errors algorithm combining MDC（Multiple Description Coding） with ECN（Error Concealment） was presented for v-i deo in order to improve the robustness of the video transmission．In this new algorithm‚the wavelet coefficients are divided into different groups according to their spatia-l temporal relationships after the wavelet transformation, and each group was independently encoded by using the3D-SPIHT algorithm, thus creation multiple description is which are transmitted through multiple independent channels．In addition, every description embedded bit-streams, and this makes it feasible to encode with quality scalability．When the end-user receives few descriptions, a low-quality image can be reconstructed according to the received descriptions‚followed by the recovery of the lost wavelet tree by error concealment method．Simulation tests were finally carried out aiming at multiple sequences, with the conclusion that the proposed algorithm can effectively increase the robustness in video transmission．

Key words: multiple descriptions coding, error concealment, set partitioning in hierarchical tree