LDPC码的不等差错保护策略在SVC中的应用

计算机应用 ›› 2011, Vol. 31 ›› Issue (01): 270-272.

LDPC码的不等差错保护策略在SVC中的应用

任通华¹,李晓峰²,谢仕云²,刘赛思²,徐进²

1. 电子科技大学通信与信息工程学院
2.

收稿日期:2010-06-04 修回日期:2010-09-27 发布日期:2011-01-12 出版日期:2011-01-01
通讯作者: 任通华

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

Received:2010-06-04 Revised:2010-09-27 Online:2011-01-12 Published:2011-01-01

摘要/Abstract

摘要： 在分析信源信道联合编码的基础上，提出了一种使用LDPC码对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。

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

Abstract: Based on the analysis of Joint Source Channel Coding theory, an unequal error protection(UEP) scheme for scalable video coding with Low Density Parity Check(LDPC) codes was proposed. It can minimize the total end-to-end distortion of the reconstructed video. This article propose 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 are 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 lower and the peak signal to noise ratio (PSNR) of the reconstructed video is improved obviously.

Key words: Unequal Error Protection(UEP), Joint Source Chanel Coding(JSCC), Scalable Video Coding(SVC)

任通华李晓峰谢仕云刘赛思徐进. LDPC码的不等差错保护策略在SVC中的应用[J]. 计算机应用, 2011, 31(01): 270-272.

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