关键词: 视频压缩, H．264视频编码, 码率控制, 信道带宽充裕度, 宏块级亮度直方图差异

Abstract:

As the existing rate control algorithms for H. 264 frame layer do not consider the relationship between the encoding complexity of video sequence and the available channel bandwidth, a novel rate control algorithm is proposed. In this algorithm, each video sequence is divided into several scenes, and the channel bandwidth sufficiency is introduced to describe the relationship between the encoding complexity of each scene and the available channel bandwidth. Moreover, the target bit and the quantization parameter are adjusted according to the channel bandwidth sufficiency and the relative encoding complexity measurement based on block histogram. Simulated results show that, as compared with JVT-G012, the proposed algorithm can achieve better trade-off among compressed video quality, available channel bandwidth and encoder buffer fullness under different channel bandwidth sufficiencies.

Key words: image compression, H. 264 video coding, rate control, channel bandwidth sufficiency, block histogram difference