计算机应用

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基于H.264标准的码率控制算法

杨宇 何小海 吕瑞   

  1. 四川大学电子信息学院图像信息研究所 四川大学电子信息学院图像信息研究所
  • 收稿日期:2008-09-08 修回日期:2008-10-22 发布日期:2009-03-01 出版日期:2009-03-01
  • 通讯作者: 何小海

Rate control algorithm based on standard H.264

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  • Received:2008-09-08 Revised:2008-10-22 Online:2009-03-01 Published:2009-03-01
  • Contact: HeXiao Hai

摘要: 在视频通信过程中,为了使编码端输出码流更好地适应不同的信道,基于H.264视频编码标准提出一种改进码率控制算法。该算法针对标准算法中对基本单元的MAD值预测时只考虑时间上相关性的缺点,提出了一种新的结合时间预测和空间预测的预测方法。实验结果表明,与标准算法相比较,该算法能更准确地控制码率,同时视频输出序列的峰值信噪比也得到了提高,编码端输出码流能够更加平稳。

关键词: 图像传输, 码率控制, 平均绝对差, H.264

Abstract: During the video communication process, an improved rate control algorithm was developed based on H.264 video coding standard in order to make the output data stream better adapted to different channels. Contrary to the MAD prediction of the basic unit only considering the relationship of the time in the coding standard, a new prediction method was introduced combining time prediction and space prediction. Compared with coding standard, the experimental results illustrate that the new algorithm can control rate more precisely and increase the peak signal noise ratio of the output video stream effectively. It proves that the new algorithm can make the output data stream of the encoder more stable.

Key words: image transmission, rate control, Mean Absolute Difference (MAD), H.264