一种增强MPEG-4数据分割鲁棒性的新算法  

New Algorithm for Enhancing MPEG-4 Standardized Data Partitioning Method

作　　者：王东华[1] 周源华[1] 王建[1] 

机构地区：[1]上海交通大学图像通信与信息处理研究所,上海200030

出　　处：《数据采集与处理》2004年第3期292-296,共5页Journal of Data Acquisition and Processing

基　　金：国家自然科学资金 ( 60 2 0 2 0 0 6)资助项目。

摘　　要：首先对 MPEG-4码流各语法组元的重要性进行了分析 ,并将最重要的纹理信息进一步细分测试 ,得出不同的高频纹理信息具有不同重要性的结论。在此基础上 ,针对 MPEG-4标准数据分割方法将编码的高频纹理信息等同对待、以至当高频细节的视频帧出错时掩盖效果不佳的缺点 ,提出了一种新的数据分割算法 ( New DP)。该算法内嵌了 MPEG-4标准数据分割算法的结构 ,并充分考虑了重要的高频纹理信息 ,在简单的错误掩盖处理后 ,获得比标准数据分割方法高出 2～ 3d B的平均峰值信噪比 ( Peak signal-noise ratio,PSNR)增益 ,可考虑运用于无线信道等易出错环境下的鲁棒视频传输场合。By analyzing and testing significance of different syntax elements of MPEG-4 bitstreams, the most important syntax element,i.e. texture information of IVOP and PVOP, is further divided into smaller parts for the significance testing. Then based on the significance-testing results and the defect of the MPEG-4 standardized data partitioning method that deals with all AC coefficients of IVOP and texture information of PVOP as a whole, a new data partitioning algorithm called NewDP is presented. In addition to the similar structure of the MPEG-4 standardized data partitioning method, the NewDP algorithm considers important AC coefficients of IVOP and DC coefficients of PVOP. After processing simple error concealments, the NewDP algorithm can get better video reconstructing effects with a gain of about 2～3 dB of average peak signal-noise ratio (R_(PSN)), thus it is suitable for robust video communication in error-prone environments such as wireless channels.

关 键 词：鲁棒性 数据分割 MPEG-4 视频通信 NewDP 纹理信息 

分 类 号：TN911.72[电子电信—通信与信息系统]