基于结构相似的H.264主观率失真性能改进机制  

Subjective Rate-distortion Performance Improvement Scheme for H.264 Based on SSIM

作　　者：崔子冠[1] 朱秀昌[1] 

机构地区：[1]南京邮电大学图像处理与图像通信重点实验室,南京210003

出　　处：《电子与信息学报》2012年第2期433-439,共7页Journal of Electronics & Information Technology

基　　金：国家自然科学基金(60672134;61071091);江苏省研究生培养创新工程(CX10B_190Z)资助课题

摘　　要：H.264以客观失真作为失真准则进行码率控制(RC)和率失真优化(RDO)模式选择,无法得到最优的主观质量。该文在作者之前研究成果的基础上将基于结构相似(SSIM)的主观失真用于指导H.264基于RDO的帧间模式选择,进一步提出了宏块(MB)层自适应的分析型拉格朗日(Lagrange)乘子来更好地平衡码率和SSIM失真。实验结果表明:在给定目标码率下,该文算法相比基于客观质量的编码算法及基于SSIM的RC算法(但未进行基于SSIM的RDO帧间预测)更有效地编码了图像结构信息,得到了更好的主观率失真性能和主观图像质量。H.264 takes objective metric as distortion criteria to perform Rate Control（RC） and Rate Distortion Optimization（RDO）-based mode decision,which can not acquire optimal subjective quality.Base on our previous research results,this paper applies Structural SIMilarity（SSIM） based subjective distortion to RDO-based inter mode decision in H.264 video coding,and further proposes an analytic MacroBlock（MB） layer Lagrange multiplier adjustment scheme to adaptively balance the tradeoff between rate and SSIM distortion better.Experimental results show that,at given target bit rate,the proposed method encodes image structural information more effectively,and thus acquires better subjective RDO performance and image quality compared with objective quality based encoding scheme and SSIM-based RC method（without performing SSIM-based RDO inter prediction）.

关 键 词：视频编码 H.264 率失真优化 LAGRANGE乘子 结构相似性 

分 类 号：TN919.8[电子电信—通信与信息系统]