摘要： 针对H.264视频编码标准，在综合考虑码率、缓冲区状态和视频序列复杂度的基础上，提出一种新型的I帧码率控制算法。使用边缘信息，建立幂函数形式和指数函数形式的2种R-Q模型。基于前4个待编码帧的预编码，估计首个I帧的时间复杂度，第1个I帧的比特分配得到修正。仿真结果证明，该码率控制算法可以有效提高重建视频的峰值信噪比(PSNR)，降低PSNR波动，并大幅减少跳帧情况的发生。

关键词: H.264标准, 码率控制, 帧内编码帧, 码率-量化参数模型, 边缘信息

Abstract: This paper proposes a new rate control algorithm for I frames in H.264/AVC based on rate, buffer status and complexity of sequences. Using edge information, two R-Q models for I frames are established in the forms of power and exponent. The number of target bits for the first I frame is corrected based on the pre-encoding of the first four frames. Experimental results show that the proposed algorithm can increase the average Peak Signal to Noise Ratio(PSNR) of reconstructed videos, depress the fluctuation of PSNR, and avoid frame skipping significantly.

Key words: H.264 standard, rate control, intra-coded frame, bitrate-quantization parameter model, edge information

中图分类号: 

• TN919.81