LDPC码的不等差错保护策略在SVC中的应用  

Application of unequal error protection method with low density parity check codes in scalable video coding

作　　者：任通华[1] 李晓峰[1] 谢仕云[1] 刘赛思[1] 徐进[1] 

机构地区：[1]电子科技大学通信与信息工程学院,成都611731

出　　处：《计算机应用》2011年第1期270-272,276,共4页journal of Computer Applications

基　　金：电子科技大学青年基金资助项目(TX0706)

摘　　要：在分析信源信道联合编码的基础上,提出了一种使用低密度奇偶校验(LDPC)码对可伸缩视频编码(SVC)比特流进行不等差错保护的策略,能够使端到端的视频序列失真最小化。该不等差错保护策略根据各帧对重建图像的贡献量大小为其进行合理的比特分配,并对每一帧的各质量层实施最佳的非均衡差错保护。实验结果表明,与基于拉格朗日的优化方法相比,该方法更为简单,重建视频的峰值信噪比(PSNR)性能也有明显改进。Based on the analysis of Joint Source Channel Coding （JSCC） theory, an Unequal Error Protection （UEP） scheme for Scalable Video Coding （SVC） with Low Density Parity Check （LDPC） codes was proposed. It can minimize the total end-to-end distortion of the reconstructed video. This article proposed a bit allocation algorithm that can optimally allocate bits to each frame depending on their contribution in the reconstructed video. LDPC codes with different code rate were applied for different layers in order to provide UEP. The simulation results show that the proposed algorithm yields competitive results against the Lagrangian-based algorithm. The complexity of the algorithm is smaller and the Peak Signal-to-Noise Ratio （PSNR） of the reconstructed video is improved obviously.

关 键 词：可伸缩视频编码 非均衡差错保护 信源信道联合编码 LDPC编码 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]