一种基于TMN8模型的H.264码率控制方法  

Novel H.264 Rate Control Method Based on TMN8 Model

作　　者：李娜[1] 王中元[1] 何政[1] 傅佑铭[1] 常军[1] 

机构地区：[1]武汉大学计算机学院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》2015年第6期111-114,150,共5页Computer Science

基　　金：国家自然科学基金(61170023;61303114;61172174;61302111;U1404618)资助

摘　　要：针对TMN8码率控制模型存在的一些局限客观上限制了其在实时视频通信中性能的问题,提出了3个方面的改进措施:目标比特率计算、图像中心加权、分层次码率控制。同时,针对H.264码率控制中存在的码率控制与RDO运动估计间互为因果的矛盾,提出一种两遍运动估计的解决方案,并充分利用预运动估计阶段产生的附带信息来加速和优化编码过程。最终实现了一种基于TMN8模型的精确的H.264码率控制方法。实验结果和在SIP视频会议系统中的具体应用都表明,本方法对提高实时通信系统的视频品质和QoS均起到了积极效果。To address the drawbacks of TMN8 rate control model in real-time video communications in practical scena- rios, this paper proposed three technical modifications., target bit rate computation, center-oriented perceptual weighting, and layered rate control. Meanwhile, a two-pass motion estimation approach was also established to deal with the dilem- ma of cause and effect between RDO estimation and rate control, in which the motion information generated by pre-esti- marion stage is further used to speed up and optimize formal encoding process. A high-precision H. 264 rate control method employing TMN8 model was ultimately implemented on the basis of the presented improved techniques and the two-pass approach. Simulation experimental results and practical applications in SIP video conference system demon- strate that this method does play a positive effect on the visual experience of real-time video.

关 键 词：码率控制 H.264 TMN8 

分 类 号：TN919.8[电子电信—通信与信息系统]