| 一种基于H.264/AVC的宏块级码率控制优化算法 |
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| 引用本文： | 龙昭华,程宏,蒋贵全,漆动波.一种基于H.264/AVC的宏块级码率控制优化算法[J].重庆邮电学院学报(自然科学版),2009(6). |
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| 作者姓名： | 龙昭华 程宏 蒋贵全 漆动波 |
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| 作者单位： | 重庆邮电大学计算机科学与技术学院; |
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| 基金项目： | 国家质检总局公益性行业科研专项经费项目基金(10-226); 重庆市科技攻关项目基金(CSTC,2007AC2053) |
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| 摘 要： | 为了在网络带宽和延迟的限制条件下获得持续稳定的视频编码质量,提出一种优化的宏块级码率控制算法。这种算法基于平均绝对误差(mean absolute difference,MAD)线性预测模型和二元率失真模型,充分利用视频序列的时空相关性,有效降低了MAD预测复杂度和目标位率与实际位率的误匹配率。大量实验结果表明,与JM8.6中的码率控制算法相比,提出的算法大大降低了编码时间,能够实现位优化分配和输出码率的精确控制。
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| 关 键 词： | 码率控制 平均绝对误差 率失真优化 基本单元 |
An optimal macroblock level rate control algorithm based on H.264/AVC |
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| LONG Zhao-hua,CHENG hong,JIANG Gui-quan,QI Dong-bo.An optimal macroblock level rate control algorithm based on H.264/AVC[J].Journal of Chongqing University of Posts and Telecommunications(Natural Sciences Edition),2009(6). |
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| Authors: | LONG Zhao-hua CHENG hong JIANG Gui-quan QI Dong-bo |
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| Institution: | LONG Zhao-hua,CHENG hong,JIANG Gui-quan,QI Dong-bo(College of Computer Science , Technology,Chongqing University of Posts , Telecommunications,Chongqing 400065,P.R.China) |
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| Abstract: | In order to obtain consecutive and smooth video encoding quality under the network bandwidth and delay constrained,an optimal macroblock level rate control algorithm was presented.Based on the linear MAD prediction model and the quadratic rate-distortion model,this scheme takes full advantage of spatial-temporal correlations of video sequences,which effectively reduces the MAD prediction complexity and improves the mismatch ratio of target bits and actual achieved bits.The experimental results show that the... |
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| Keywords: | rate control mean absolute difference(MAD) rate distortion optimization(RDO) basic unit |
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