计算机应用 ›› 2005, Vol. 25 ›› Issue (12): 2800-2802.

• 多媒体与软件技术 • 上一篇    下一篇

基于H.264/AVC的一种新的帧一层码率控制算法

王昭顺1，张平2   

  1. 1.北京科技大学信息工程学院； 2.北京科技大学计算机系
  • 收稿日期:1900-01-01 修回日期:1900-01-01 发布日期:2005-12-01 出版日期:2005-12-01

New frame-layer rate control algorithm based on H.264/AVC

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  1. 1.School of Information Engineering,University of Science and Technology Beijing,Beijing 100083,China;2.Department of Computer Science,University of Science and Technology Beijing,Beijing 100083,China
  • Received:1900-01-01 Revised:1900-01-01 Online:2005-12-01 Published:2005-12-01

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摘要： 在参考软件Joint Model(JM)8.4中已给出了码率控制算法JVT-017的提案。由于该算法采用线性模型预测平均绝对差Mean Absolute Difference(MAD),运算量较大且存在一定的误差,为此提出了一种新的帧一层的非线性量化级计算模型。仿真结果显示,与JVT-H017码率控制算法相比,采用改进算法的H.264编码器在在相同条件下码率控制得更准确, 并能获得较高的峰值信噪比PSNR和主观视觉质量,特别在有场景切换的情况下缓冲区并未出现上溢和下溢现象。

关键词: H.264, 码率控制, 平均绝对差, QP值, 目标比特数

Abstract: Rate control algorithm(JVT-H017) has been given in encoder reference software JM(Joint Model) 8.4.However,in JM a linear model is used to predict the MAD,which costs too much operations and exists deviations.A new frame-layer non-linear quantization parameter calculation model was proposed.Simulation results show that,comparing with JVT-H017,the H.264 coder using the proposed algorithm can control the bit rate more accurately and obtain a higher PSNR and visual quality.Especially when the two schemes are applied to the sequence with scene changes,no buffer overflow or underflow is guaranteed.

Key words: H.264, rate control, Mean Absolute Difference(MAD), QP value, target bits

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