摘要
本文在速率失真函数的基础上 ,提出了适合精细可分级编码视频流的最优的速率分配方法。该法是在给定的速率限制下 ,使整个视频序列的平均峰值信噪比 (PSNR)最大 ,也就是使序列的总体失真最小。为此 ,首先建立增强层的速率失真函数 ,然后使用拉格朗日乘子方法来求解这个条件最优问题的解。实验结果表明 ,与公平速率分配相比 ,最优速率分配不仅可以改善精细可分级编码的编码效率 ,使整个视频序列的平均峰值信噪比提高 12 2 88dB ,而且能够使解码视频的质量波动更加平滑 ,此外 。
An optimal rate allocation method for fine granularity scalable video streaming based on rate-distortion function was presented. The method maximizes the average PSNR of the whole video sequence or minimizes the overall distortion, subject to the bit rate constraint. To solve this problem, the rate-distortion function of the enhancement layer was first established and the Lagrange multiple method was used to get the optimal solution of the constrained optimization problem. Experimental results show that, compared with the uniform rate allocation method, optimal rate allocation can improve the coding efficiency of fine granularity scalable coding and average PSNR of the whole video sequence can be improved up to 12.288 dB. The optimal rate allocation method can greatly reduce fluctuations between adjacent frames. What is more, the optimal rate allocation method can improve the efficiency of the network bandwidth.
出处
《兵工学报》
EI
CAS
CSCD
北大核心
2004年第4期446-449,共4页
Acta Armamentarii
关键词
视频流式传输
通信技术
精细可分级编码
峰值信噪比
网络带宽
communication technique, fine granularity scalability, video streaming, optimal bit allocation, peak signal-to-noise ratio, network bandwidth
