基于感兴趣区域的率失真优化帧内刷新算法研究  

Research on RD Optimized Intra Refreshment Algorithm for Region of Interest

作　　者：阮若林[1,2] 胡瑞敏[2] 李忠明[1] 

机构地区：[1]咸宁学院电子与信息工程学院,咸宁437100 [2]武汉大学国家多媒体软件工程技术研究中心,武汉430072

出　　处：《计算机科学》2009年第10期284-288,共5页Computer Science

基　　金：国家自然科学基金项目(60772106);湖北省教育厅优秀中青年人才计划项目(20082803)资助

摘　　要：由于视频图像中不同区域的重要性存在着很大差异,人眼对其主观质量的要求也不一样,因此对感兴趣区域的前景图像和非感兴趣区域的背景图像的主观质量要求也可以不一样,尽管目前对感兴趣区域的研究已有不少,但是将全局率失真优化、码率控制、帧内宏块刷新和感兴趣区域结合的相关研究并不多见。基于此提出了基于人眼感兴趣区域的率失真优化帧内宏块刷新算法,该算法采用端到端的全局率失真理论,对感兴趣区域和非感兴趣区域进行分析处理,使感兴趣区域的宏块能得到更及时的帧内刷新,由于受到码率的限制,必须对感兴趣区域和非感兴趣区域重新进行码率分配。最后,在JVT的JM12.2平台上实现该算法。大量实验结果表明,与传统的基于率失真优化的帧内刷新算法相比,基于感兴趣区域的率失真优化帧内刷新算法在感兴趣区域能够取得更好的主观质量。The importance of video sequence varies with the regions, and human visual sensitivity too varies with the importance of region of video sequence, so the subjective quality requirement of region of interesting is not the same as non-region of interesting. Although there are very many researches on region of interesting, it is few research which joints the overall RD optimal theory, the rate control, intra macroblock refreshment and the region of interesting. So the paper proposed the RD optimized intra refreshment algorithm based on region of interesting, and it was used the overall end to end distortion theory to analyse the region of interesting and non-region of interesting, and gave more intra refreshment chances to the marcoblock in region of interesting, as the bit rate was constrained, so the bit rate of the region of and non-region of interesting must be reallocated. At last, the algorithm was implemented in reference software JM12. 2 of JVT. The simulation results showed that, comparing with the traditional RD optimized intra refreshment algorithm, the proposed intra refreshment algorithm based on region of interesting could obtain a better subjective quality of the reconstructed video in the region of interesting at the decoder.

关 键 词：感兴趣区域 率失真优化 帧内刷新 码率控制 H.264/AVC 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]