Abstract: Rate control is an importance constituting part of the H.264/AVC.It regulate varying bit rate characteristics of the coded bit stream in order to produce high quality decoded frame at a given target bit rate.This paper proposes an improved rate control algorithm based on the algorithm which is presented by Nejat Kamaci,and in order to reduce the demerit that costs too many operations and exists deviation of the traditional linear model,presents a new weighted mode to predict the MAD.Simulation results show that our proposed algorithm achieves a better performance on veracity and image quality.

Key words: H.264/AVC, rate control, quantization parameter, MAD

摘要： 码率控制是H.264/AVC的一个重要组成部分,它通过调节编码比特流的的码率变化从而在给定的信道带宽下获得持续较好的图像质量。在Nejat Kamaci提出的码率控制算法上进行了改进,增加了宏块级码率控制,并针对传统的平均绝对误差（Mean Absolute difference,MAD）线性预测模型计算量大且存在一定误差的缺点,提出一种新的MAD加权预测模型,降低了算法复杂度和预测误差。实验结果表明,改进算法的码率控制更加准确,并且图像的PSNR值也有所提高。

关键词: H.264/AVC, 码率控制, 量化参数, 平均绝对误差