Temporal dependent rate-distortion optimization based on distortion backward propagation

被引：0
作者：
Guo H. [1 ,2 ]
Zhu C. [2 ]
Yang X. [3 ,4 ]
Luo L. [2 ,3 ]
机构：
[1] School of Engineering, Honghe University, Mengzi
[2] School of Information and Communication Engineering, University of Electronic Science and Technology of China, Chengdu
[3] School of Communication and Information Engineering, Chongqing University of Posts and Telecommunications, Chongqing
[4] School of Physics and Engineering Technology, Chengdu Normal University, Chengdu
来源：
Tongxin Xuebao/Journal on Communications | 2022年 / 43卷 / 12期
基金：
中国国家自然科学基金;
关键词：
adaptive Lagrange multiplier; distortion propagation model; HEVC; rate-distortion dependency; rate-distortion optimization;
D O I：
10.11959/j.issn.1000-436x.2022230
中图分类号：
学科分类号：
摘要：
Rate-distortion optimization (RDO) is a crucial technique in block based hybrid video encoders. However, the widely used independent RDO is far from obtaining optimal coding performance. To improve the rate-distortion (R-D) performance of high efficiency video coding (HEVC), a temporal dependent RDO algorithm was proposed. Firstly, the formula to calculate temporal distortion propagation factor was derived by using an exponential R-D function. Then, the coding distortion and motion compensation predicted error were obtained by pre-encoding, and the temporal distortion propagation factor was estimated by using distortion backward propagation. Finally, the Lagrange multiplier and quantization parameter of coding tree unit were adaptively adjusted to optimize bit resources allocation. Experimental results show that compared with the original RDO method in HEVC under the low-delay configuration, the proposed algorithm achieves an average 4.4% bit rate reduction for all test sequences, and up to 13.0% bit rate reduction for test sequence BasketballDrill, at the same reconstructed video quality. © 2022 Editorial Board of Journal on Communications. All rights reserved.
引用
收藏
页码：222 / 232
页数：10
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