结合运动搜索的混合域I帧错误隐藏  

Motion Searching Error Concealment for I frame

作　　者：李学[1] 冯桂[1] 林志锋[1] 刘莎[1] 

机构地区：[1]华侨大学信息学院,泉州362021

出　　处：《微计算机应用》2008年第4期44-48,共5页Microcomputer Applications

基　　金：国务院侨办科研基金项目(编号06QZR03);福建省自然科学基金项目(基金编号:A0610022)

摘　　要：在数字广播电视,移动视频终端和视频电话中错误恢复是一个必须的部分。最新的视频压缩标准H.264/AVC为一系列视频消费电子应用提供更高的编码效率。但是H.264的视频流仍然容易发生传输错误。根据H.264的编码特性和网络特性众多的错误隐藏方法已经被提出。在H.264中I帧的错误隐藏尤为重要,因为I帧的错误会通过运动估计传播到后续的P帧或B帧中。结合时域和空域错误隐藏算法,本文提出一种用于I帧的低复杂度自适应空域/时域运动估计算法。实验结果显示,本文提出的算法的视觉效果和PSNR都优于原算法。Error resilience is an essential part for video communications, such as digital TV broadcasting, mobile video terminals and video telephone. The latest video compresion standard H. 264/AVC provides more coding efficiency for a wide range of video consu - mer applications. Yet H. 264 video streams are still vulnerable to transmission errors. A set of error concealment techniques are proposed to provide error resi - lience based on new coding and network characteristics of H. 264. The error concealment of I frame espe - cially important for the error of I frame will propagate to the following P or B frame by motion estimation. Comb - ining the temporal and spatial concealment algorithms, an adaptive spatial/temporal estimation method with low complexity for I frame is presented. Simulations show that the proposed scheme outperforms the existing method both on PSNR and visual quality obviously.

关 键 词：错误隐藏 H.264/AVC 运动估计 I帧 

分 类 号：TN949.197[电子电信—信号与信息处理]