作　　者： ; ;

机构地区： 华南理工大学计算机科学与工程学院

出　　处： 《华中科技大学学报（自然科学版）》 2008年第6期22-24,共3页

摘　　要： 针对H.264无线视频通信中的编码比特率问题,在一般的二项式计算模型理论的基础上,分析了比特率计算模型和均方差失真模型,并建立了编码比特率量化参数和宏块帧内刷新率的关系,提出了码率控制的新思想.该方法不仅能够在给定的网络带宽下,自适应地调整比特分配和量化参数,防止缓冲区的上溢和下溢,而且运用率失真优化求解方法精确地控制编码比特数,从而使帧内宏块级分配优化. For the encoding bit-rate problem in H. 264 wireless video communication, the bit-rate computation model and the standard deviation distortion model were analyzed, the relation between the quantization parameter of the encoding bit-rate and the intra frame refresh rate of the macro block was established, and a new ideal about the coding rate on the basis of general binomial computation model theory was put forward. Furthermore, this method not only can adaptively adjust the bit allocation and quantization parameter and prevents buffer from overflowing downward or upward under given network bandwidth, but also can apply the rate-distortion to optimize the solution method, control the encoding bits accurately and optimizes the allocation between the inter frame encoding macro block.

关 键 词： 率失真函数 信源编码 比特率 刷新率 虚拟缓冲区

领　　域： [自动化与计算机技术] [自动化与计算机技术]