H.264/AVC视频容错传输的菱形FMO分布方法

Diamond Distribution Pattern in FMO for Error Resilient H.264/AVC Video Transmission

图像压缩技术是基于在空域,时域或者频域上移除数据冗余的算法。它相当大地减少了数据转换率,但是随之的视频压缩信号对于传输误差更加敏感。差错恢复技术相对于通道误差增强了视频比特流的鲁棒性。在H.264/AVC的条带编码作为一种差错恢复技术之一被用于限制接收视频品质的数据丢失效应。有一种模式非常重要,它是将图像的宏块分配成不同的条带组,并能够提供不同的差错恢复标准。该文将深入分析这一类分散类型的灵活的宏块顺序(FMO)模式性能,并提出一个定义明确的系统模式,可以更完全地挖掘宏块顺序中离差概念从而克服误差损失。仿真结果显示:新的改进方案的性能优于传统模式。

Video compression methods are based on algorithms that help to remove redundancy in the spatial, temporal and/or frequency domains. It considerably reduces the data transfer rates but consequ＂,nt compressed video signal is more sensitive to transmission errors. The error resilience technology enhances the robustness of the video bit - stream against channel errors. Slice coding in H. 264/AVC is used as one of the error resilience techniques that can be used to limit the effects of data loss on received video quality. The pattern that assigns macro - blocks in a picture to different slice groups is of great importance and can provide different levels of error resilience. This paper presents an insight into the performance of such patterns in scattered type of FMO. We propose a well - defined systematic pattern that fully exploits the concept of dispersion in macro - block ordering to overcome error losses. The results of our evaluation demonstrate improved performance of proposed pattern over conventional one.