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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 realize the dynamic analysis of the end-to-end distortion characteristics in wireless low bit rate video applications, this paper first analyzes the source and channel distortion of I-frame and P-frame using GOP as the observation unit. Then, Channel distortion in GOP.Finally, based on this, a source-channel joint rate distortion (RD) model is proposed.It can dynamically estimate one channel according to the content change of video sequence and the packet loss rate The average end-to-end distortion of each frame in the GOP experiment results show that the model has good dynamic performance and accuracy.