Efficient frame-level bit allocation algorithm for H.265/HEVC

Efficient frame-level bit allocation algorithm for H.265/HEVC
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H.265/HEVC 的高效帧级比特分配算法

DOI:
10.1049/iet-ipr.2016.0166
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发表时间:
2017-01
影响因子:
2.3
通讯作者:
Yang Fuzheng
Yang Fuzheng
中科院分区:
计算机科学4区
文献类型:
--
作者:
He Jing;Yang Fuzheng

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码率控制在视频编码中起着重要的作用,它通过调整编码码流来达到目标码率,它包括两个基本步骤:比特分配和量化参数选择。在这里,前者是直接影响RC性能的关键因素。因此,在这项研究中,提出了一种有效的帧级BA算法的最新视频编码标准H. 265/高效视频编码(HEVC)。首先,通过分析帧级BA的优化问题,发现与帧级BA相关的两个因素,即帧间依赖性和目标比特率。然后,提出了一种帧间相关性的度量方法来反映连续帧间的相关性。最后,根据动态规划法的权重分配结果,研究了权重分配与两个因素之间的关系,并在此基础上建立了有效的BA模型。实验结果表明,与HM-14.0中的原始RC方案相比,所提出的帧级BA算法平均降低了5.19%的BD速率,而编码时间的增加可以忽略不计。此外,该算法还实现了更高的GOP级RC精度相比,原始RC计划在HM。
Rate control (RC) plays a critical role in video coding for regulating the coded bit-stream to achieve the target bitrate, which involves two basic steps: bit allocation (BA) and quantisation parameter selection. Here, the former is a key element to directly affect the performance of RC. So, in this study, an efficient frame-level BA algorithm is proposed for the latest video coding standard H.265/high-efficiency video coding (HEVC). First, by analysing the optimisation problem of the frame-level BA, two factors have been found to be related to the frame-level BA, which are inter-frame dependency and the target bitrate. Then, a measure of inter-frame dependency is put forward to reflect the correlation among consecutive frames. Finally, according to the results of allocation weights through the dynamic programming method, the relationships among the allocation weights and the two factors are investigated, and based on which the efficient BA model is established. Experimental results show that in comparison with the original RC scheme in HM-14.0, the proposed frame-level BA algorithm reduces, on average, BD-rate by 5.19% with negligible encoding time increase. In addition, the proposed algorithm also achieves higher GOP-level RC accuracy compared with the original RC scheme in HM.
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