摘要
本文在传统位率控制方法的基础上提出一种新算法 ,即基于宏块的最佳位率控制算法 .主要思想是在考虑带宽 ,比特率和缓冲区大小的同时 ,考虑不同宏块模式的选择对位率的影响 ,文中给出了一些相关的实验结果并将其与传统方法所得数据相比较 ,结果表明在多数位率条件下用本算法得到的 PSNR比传统方法要好 .
Rate control is very important in video coding and transmission system. Traditional rate control algorithm is restrained with bandwidth and buffer size based on frames. Nowadays prevalent video coding standard such as ITU H.261, H.263 and ISO MPEG1, MPEG2, MPEG4 all are based on macroblocks. Several kinds of macroblocks coding mode also have been given in these international video coding standards. Optimal rate distortion function is not just restrained with bandwidth, bit rate and buffer size, different macroblocks mode choice will also influence rate distortion function. This paper present a new algorithm based on traditional rate control method. Namely optimal rate control algorithm based on macroblocks. Its main contribution is that not only bandwidth, bit rate and buffer size are to be considered, but also take into account the influence of different macroblocks mode choice. Some related experimental results have been given and compared with traditional rate control method. Results show that PSNR of the proposed algorithm is better than the traditional method in various rate conditions.
出处
《小型微型计算机系统》
EI
CSCD
北大核心
2000年第4期389-392,共4页
Journal of Chinese Computer Systems
基金
国防预研基金和湖北省自然科学基金
关键词
位率控制
视频编码
动态规划
QOS控制
Rate control
Dynamic programming
Rate distortions
Qos control
