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一种基于图像复杂度的新H.264码率控制算法

发表时间:2008-05-31  浏览量:2516  下载量:1231
全部作者: 沈工建,王安娜,马继东,谷召伟
作者单位: 东北大学信息科学与工程学院
摘 要: 在H.264标准中,并没有很好地研究码率控制。它将量化参数同时用于码率控制和率失真优化,导致了鸡蛋悖论。本文提出了一种新的基于图像复杂度的码率控制算法,在宏块级编码时可以绕开鸡蛋悖论。采用平均绝对交换(mean absolute transform, MAT)来度量编码复杂度,并使用峰值信噪比(peak signal-to-noise ratio, PSNR)变化比作为另一个评估图像复杂度的参考量和MAT相结合,对图像复杂度给出更客观的评价。实验结果表明:本文提出的码率控制算法使码率控制率降低了0.03 kbps左右,解码图像的PSNR提高了0.197 dB。
关 键 词: 信号与信息处理;H.264;码率控制;图像复杂度;平均绝对交换
Title: A novel H.264 rate control algorithm based on image complexity
Author: SHEN Gongjian, WANG Anna, MA Jidong, GU Zhaowei
Organization: College of Information Science and Engineering, Northeastern University
Abstract: In H.264 standard, it does not handle the rate control well. It uses quantization parameter both in rate control and rate-distortion optimization, resulting in the chicken-egg dilemma. This paper proposed a new rate control algorithm based on image complexity and the chicken-egg dilemma can be avoided in macro-block layer coding using the new algorithm. A new measurement of image complexity called mean absolute transform(MAT) is used together with peak signal-to-noise ratio(PSNR) as another image complexity measurement to estimate image complexity more objectively. Experiment results show that the novel rate control algorithm reduces bit rate by 0.03 kbps and increases PSNR of image by 0.197 dB.
Key words: signal and information processing; H.264; rate control; image complexity; mean absolute transform(MAT)
发表期数: 2008年9月第10期
引用格式: 沈工建,王安娜,马继东,等. 一种基于图像复杂度的新H.264码率控制算法[J]. 中国科技论文在线精品论文,2008,1(10):1123-1127.
 
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