误码信道中分布式视频编码优化重建算法  

Optimal Reconstruction Algorithm of Distributed Video Coding over Error-prone Channel

作　　者：喻杨灿 卿粼波[1] 欧先锋[1] 何小海[1] 余艳梅[1] 

机构地区：[1]四川大学电子信息学院,四川成都610064

出　　处：《电视技术》2014年第9期13-17,共5页Video Engineering

基　　金：国家自然科学基金项目(61201388);高等学校博士学科点专项科研基金项目(20110181120009);四川大学青年科学基金项目(2010SCU11007)

摘　　要：针对分布式视频编码在误码环境下部分比特面解码失败,单一区间重建导致视频质量下降的情况,提出了一种多量化区间优化重建算法。该算法充分利用所有连续或不连续的正确解码比特面进行重组,从而得到多个候选的量化区间,并根据边信息与这些区间的位置关系找出最佳的解码区间。相较于传统的单一区间的重建算法,在误码环境中该算法可以更准确地重建出正确解码值。实验结果表明,所提出的算法性能明显优于单一区间的重建算法,在错误比特面错误率相同时,所提算法解码视频的峰值信噪比最大分别有1.2 dB和3.0 dB左右的提升。In error-prone channel,the channel error may cause decoding failure of several bit planes in distributed video coding,which can lead to video quality decline if using a signal interval to reconstruct. So a multi-quantization interval optimal reconstruction algorithm is proposed. By exploiting the correctly decoded bit planes continuous or not to reorganization,multiple candidate quantization intervals can be getting. Then,according to the relationship between side information( SI) and the intervals,best decoding interval can be obtained. Compared to the traditional single interval reconstruction algorithm,the algorithm can more accurately reconstruct the correct decoding value in bit error environment. The experiment results demonstrate that the performance of the proposed method is better than the instinct way,the PSNR has about 1. 2 dB and 3. 0 dB improvement when the bit plane error rate at the same level respectively.

关 键 词：分布式视频编码 误码信道 比特面解码 重建函数 

分 类 号：TN919.8[电子电信—通信与信息系统]