基于模糊控制的H.264宏块层码率控制算法

New Macro-block Layer Rate Control Algorithm Base on Fuzzy Control for H.264

针对H.264码率控制模型的不足,提出了一种新的宏块层的码率控制算法。该算法首先利用帧的时空间相关性对宏块的MAD值进行预测,然后引入了智能控制中的模糊控制方法来对码率输出进行控制,使得码率控制不再依赖于以往的各种统计模型。由于省去模型参数的更新,算法的计算复杂度有一定程度的降低。实验结果表明:与JM8.6原算法比较,该算法能在提高码率控制精度的同时,提高图像的恢复质量。

For the lack of rate control model in H. 264, a new macro-block layer rate control algorithm for H. 264 is proposed. The algorithm uses the spatio-temporal relevancy of frames estimated mean absolute difference （ MAD）. Then a fuzzy controller is applied, making rate control no longer rely on the various statistical models. By leaving out the updated of the model parameter, the computational complexity of the algorithm is decreased to some extent. The experimental results show that compared to JM8. 6 original algorithm, the new algorithm can increase the accuracy of rate control and the image quality of the restoration at the same time.