H.264中一种基于R-Q模型的自适应码率控制算法研究

作者:郑新资;骆冰清;孙知信 刊名:通信学报 上传者:张毅峰

【摘要】提出一种新的基于帧复杂度的二级码率控制算法(TSRCA,two-stage rate control algorithm)。总结码率控制算法的最新研究成果,分析码率控制基本原理,继而提出一种二级码率控制算法,以解决"蛋鸡悖论"。其次,用RDO模式选择中的比特数信息代替平均绝对残差(MAD,mean absolute difference)来预测帧的复杂度,提高了预测的准确度。所提出的码率控制算法能够显著提高码率控制精度和编码性能。

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2012 年 12 月 Journal on Communications December 2012 第 33 卷第 12 期 通 信 学 报 Vol.33 No. 12 H.264 中一种基于 R-Q 模型的自适应码率控制算法研究 郑新资,骆冰清,孙知信 (南京邮电大学 宽带无线通信与传感网技术教育部重点实验室,江苏 南京 210003) 摘 要:提出一种新的基于帧复杂度的二级码率控制算法(TSRCA, two-stage rate control algorithm)。总结码率控 制算法的新研究成果,分析码率控制基本原理,继而提出一种二级码率控制算法,以解决“蛋鸡悖论”。其次,用 RDO 模式选择中的比特数信息代替平均绝对残差(MAD, mean absolute difference)来预测帧的复杂度,提高了预测的准确度。所提出的码率控制算法能够显著提高码率控制精度和编码性能。 关键词:H.264;码率控制;帧复杂度 中图分类号:TP339 文献标识码:A 文章编号:1000-436X(2012)12-0035-08 Research on adaptive rate control algorithm for H.264 based on R-Q model ZHENG Xin-zi, LUO Bing-qing, SUN Zhi-xin (College of Internet of Things, Nanjing University of Posts and Telecommunications, Nanjing 210003, China) Abstract: The foundation theory of rate control theory in H.264 video coding standard was analyzed. The latest research work about rate control algorithm were summarized. On the basis of analysis. A novel frame-level rate control algorithm was proposed. Firstly, in order to reduce the inter-dependency between RDO (rate-distortion optimization) and rate con-trol, a kind of two-stage rate control algorithm was presented. Secondly, to provide more accurate prediction of the frame complexity, instead of the MAD (mean absolute difference), bits information in the RDO-based mode decision process was employed to predict the frame complexity. Thirdly, a self-adaptive exponential R-Q model was proposed. The pro-posed rate control algorithm overcomes the disadvantages in the rate control precision and encodi

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