【摘要】 为了更好地控制H.264的码流输出,针对H.264标准中码率控制方案提出一种基于λ参量的码率控制算法.该算法从另一角度定义了复杂度的概念,改善了标准码率控制方案中存在目标比特分配不准确和剧烈运动场景量化不准确的缺陷.实验结果表明:该算法在码率控制方面优于标准码率控制方案,使得输出的码流更加平稳;同时得到的视频图像的峰值信噪比也比标准算法平均高出0.25dB,便于码率的有效传输和在解码端得到更佳的解码视频图像.更多还原

【Abstract】 In order to control the output rate of the H.264,this paper proposes a algorithm of rate control in the H.264 based on the λ-parameter of picture complexity.It proposes the definition of the picture complexity from another standpoint.Compared to the rate control of the {H.264},it {improves} the accuracy of the target bit allocation and the quantization parameter in the scene of quick movement or scene change.The experiment results show that this algorithm is better in the rate control than the algorithm of H.264,and the PSNR is 0.25 dB higher than the algorithm of {H.264}.It will be advantageous in transporting the code steam effectively and getting the preferable decoded video.更多还原