H.264码率控制中mad预测的一种改进算法

码率控制是H．264中的一个重要的组成部分。好的码率控制可以有效地提高压缩图像的质量。而目标比特数的来准确估计，对码率控制的工作的好坏，起着不可忽略的作用。该文针对jm模型以及以往研究中，目标比特数的分配和实际比特数存在差值较大的缺点，分析了其不良影响，并提出了对mad预测的改进措施，以此来提高R—Q模型的准确性，从而提高QP预测的精确度，并通过实验结果证明其的合理性。

A New Algorithm of Improving the Mad Prediction in H.264 rate control

Rate control is one of the most important part of the H. 264, a good rate control can effectively improve the quality of the compressed picture, and the accurate estimation of target bit has a great impact on. the effect of the rate control. In this paper, we first point out the bad effect when the difference between target bits and actual bits is too big, which is not been paid much attention in JM module and other research, then we present a improvement for the prediction of the mad, so that we can strong the accurate of the R - Q module, and so is the prediction of the QP. At last, we prove its rationality through the experiment.