An Efficient Rate-distortion Optimization Method for Low-delay Configuration in H.265/HEVC Based on Temporal Layer Rate and Distortion Dependency
An Efficient Rate-distortion Optimization Method for Low-delay Configuration in H.265/HEVC Based on Temporal Layer Rate and Distortion Dependency
复制标题
基于时间层速率和失真依赖性的 H.265/HEVC 低延迟配置的高效率失真优化方法
DOI：
10.1109/tcsvt.2019.2896664
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发表时间：
2019
影响因子：
8.4
通讯作者：
Hong Ren Wu
中科院分区：
文献类型：
--
作者：
Kaifang Yang;Yanchao Gong;Miao Ma;Hong Ren Wu
目前，低时延（LD）配置作为最重要的视频编码结构之一，已被广泛应用于视频监控、视频会议等视频通信系统中。码率失真优化（RDO）也是提高视频编码性能的关键技术。LD配置下的H.265/HEVC的RDO性能受时间依赖性的显著影响。本文研究了H.265/HEVC中时间层之间的速率和失真与LD配置的关系。在此基础上，提出了一种有效的基于时间相关性的RDO方法，该方法根据不同时间层的视频运动特征自适应地选择缩放因子来估计优化后的拉格朗日乘子。实验结果表明，与H.265/HEVC测试模型（即HM）中采用的RDO方法相比，本文提出的RDO方法在LD P和LD B配置下的平均bd速率分别降低了6.4%和5.8%。
Currently, as one of the most important video coding structures, the low-delay (LD) configuration has been widely adopted in the video communication systems, such as video surveillance and video conferencing systems. The rate-distortion optimization (RDO) is also a crucial technique for improving the performance of video coding. The RDO performance of H.265/HEVC with the LD configuration is significantly affected by the temporal dependence. This paper examines the dependence of rate and distortion among temporal layers in H.265/HEVC with the LD configuration. An efficient RDO method is then proposed based on temporal dependence, where the optimized Lagrangian multipliers are estimated by adaptively selecting the scaling factors according to the video motion characteristics pertaining to different temporal layers. The experimental results show that compared with the RDO method adopted in the H.265/HEVC test model (i.e., HM), the proposed RDO method can achieve the average BD-rate reductions of 6.4% and 5.8% for the LD P and LD B configurations, respectively.