基于H.264 TM5码率控制算法的改进

Improvement research based on H.264 TM5 rate control algorithm

针对H.264TM5码率控制算法在保持图像序列平滑性和缓冲控制上的不足,同时考虑图像复杂度和缓冲状况,在H.264TM5的基础上提出了一种改进的帧层码率控制算法。对于图像复杂度比较高的帧,采用较小的量化参数,对于图像复杂度较低的帧,采用较高的量化参数,从而达到稳定图像质量,得到平滑图像序列的目的。同时监视缓冲状况,及时调整量化参数防止缓冲溢出。仿真结果表明:改进后的算法既能获得更平滑的图像序列,也能更好地控制缓冲。

Aiming at the shortcoming of H. 264 TM5 rate control algorithm on sequence smoothness keeping and buffer controlling, the picture complexity and buffer situation were considered simultaneously, and an improved frame layer rate control algorithm based on H. 264 TM5 was proposed. The frames of higher picture complexity were quantized with bigger parameter, while frames of lower picture complexity were quantized with smaller parameter. The buffer situation was also monitored to prevent the buffer from overflowing. The simulation shows that the improved algorithm can not only get smoother picture sequence, but also control the buffer better.