无线低码率视频中的信源-信道联合RD模型  

Joint Source-Channel RD Model for Wireless Low-Bit-Rate Video Transmission

作　　者：裴智勇 蔡安妮[1] 

机构地区：[1]北京邮电大学信息与通信工程学院,北京100876

出　　处：《北京邮电大学学报》2010年第5期75-79,共5页Journal of Beijing University of Posts and Telecommunications

基　　金：国家自然科学基金项目(60772114,90920001)

摘　　要：为了实现无线低码率视频应用中端到端失真特性的动态分析,本文首先以图像组(GOP)为观察单元,分别对I帧和P帧进行了信源和信道的失真分析;然后分析了信道失真在GOP内的传播规律;最后在此基础上,提出了一个信源-信道联合率失真(RD)模型.该模型能根据视频序列的内容变化和信道丢包率,动态地估计出一个GOP中各帧的平均端到端失真.实验结果表明,该模型具有很好的动态性能和精确性.In order to dynamically analyze the end-to-end distortion, a new joint source-channel rate- distortion （RD） model for wireless low-bit-rate video transmission is proposed. The source and the channel distortions of I and P frames are respectively analyzed on a group of picture （GOP） ,and the propagation of distortion within the GOP is discussed. It can dynamically estimate the average end-to-end distortion of each frame in the G0P according to packet loss rate and characteristics of the video sequence. Experiments show that the accuracy of this model is satisfactory.

关 键 词：图像组分析 信源失真 信道失真 联合率失真 量化参数 

分 类 号：TN919.8[电子电信—通信与信息系统]