基于指数率失真模型的增量式码率控制算法  

Incremental rate control algorithm on exponential rate distortion model

作　　者：田玲[1] 周益民[2] 孙世新[1] 

机构地区：[1]电子科技大学计算机科学与工程学院,成都610054 [2]电子科技大学国家级计算机实验教学示范中心,成都610054

出　　处：《电子测量与仪器学报》2010年第9期795-802,共8页Journal of Electronic Measurement and Instrumentation

摘　　要：高速增长的视频通信需求促进了视频压缩技术的快速发展。为了进一步提高H.264/AVC的码率控制性能,提出了一种新的码率控制算法。新算法包含一种新型的指数型率失真模型,一种增量式QP计算方法,一种基于权重的帧比特位分配策略和一种线性回归模型参数更新方法。基于指数率失真模型的一阶微分特性和拉格朗日中值定理,提出的增量式QP计算方法成功地解决H.264/AVC中的"QP悖论"。编码实验结果表明,新算法与JM模型中推荐的码率控制算法相比,实际比特率更接近目标比特率,达到了更精确的缓冲控制,明显地提高了平均解码视觉质量QCIF为0.23dB,CIF为0.75dB,720p为0.12dB。The rapid growing demand of video communications causes the development for video compression techniques. To improve the performance of rate control in H.264/AVC,a novel rate control algorithm which integrated with a novel exponential rate distortion model,is proposed in this paper an incremental QP calculation method,a strategy to deal with bit allocation and a linear regression method for model parameter updating. The algorithm successfully resolved ＂QP dilemma＂ in H.264/AVC by using first order on the exponential rate distortion model and the Lagrange mean value theorem. The experimental results show that the proposed algorithm outperforms the algorithm which is adapted in JM model in obtaining precise bit rate,achieves robust buffer control,and improving the means of visual quality high up to 0.23dB for QCIF,0.75dB for CIF and 0.12dB for 720p.

关 键 词：增量式QP计算 率失真模型 码率控制 H.264/AVC 视频编码 

分 类 号：TN919.81[电子电信—通信与信息系统]