信道自适应UEP技术在H.264视频通信系统中的应用  

Application of Adaptive Channel UEP Technique on H.264 Video Communication System Designing

作　　者：李虓江[1] 

机构地区：[1]浙江大学信息与电子工程学系,浙江杭州310027

出　　处：《电视技术》2004年第3期4-7,共4页Video Engineering

摘　　要：在进行基于H.264标准的视频通信系统设计时,为提高编码视频流的抗误码性能以及编码器的编码效率,提出了一种信道自适应非平等误码保护UEP技术。该技术可根据反馈的信道状态信息自适应地确定H.264编码视频流在网络适配层NAL中的工作模式,在丢包信道中结合人眼的视觉特性重新对编码视频信息进行分区并分别采用不同优先级的误码保护。仿真实验表明,在有效提高H.264视频通信系统中解码器输出重构视频图像视觉质量的同时,进一步降低编码器端数据包的打包开销,从而提高编码器的编码效率。This paper mainly deals with an adaptive channel Unequal Error Protection (UEP) scheme in H.264 video transmission system design. In the proposed scheme the working mode of Network Adaptive Layer (NAL) could be adaptively switched between data partition mode (DPM) and single slice mode (SSM) according to the feedback of current channel state. In packet loss channel, the luminance and chrominance parts of H.264 coded video stream are reassigned to different data partitions according to the human visual characteristic (HVC) and different error protection levels are imparted to them respectively. Simulations have shown that the proposed scheme can effectively improve the visual quality of decoded video stream. The coding efficiency of encoder is also improved by reducing the packing tradeoff in proposed scheme.

关 键 词：信道自适应 UEP H.264 视频通信 非平等误码保护 网络适配层 丢包率 

分 类 号：TN919.8[电子电信—通信与信息系统]