Inter-Block Dependency-Based CTU Level Rate Control for HEVC

被引:41
|
作者
Guo, Hongwei [1 ,2 ]
Zhu, Ce [1 ]
Xu, Mai [3 ]
Li, Shuai [1 ]
机构
[1] Univ Elect Sci & Technol China, Sch Informat & Commun Engn, Chengdu 611731, Peoples R China
[2] Honghe Univ, Sch Engn, Mengzi 661100, Peoples R China
[3] Beihang Univ, Sch Elect & Informat Engn, Beijing 100191, Peoples R China
基金
中国国家自然科学基金;
关键词
Encoding; Bit rate; Distortion; Optimization; Rate-distortion; High efficiency video coding; HEVC; rate-distortion optimization (RDO); rate control; temporal dependency; adaptive Lagrange multiplier; RATE-DISTORTION-OPTIMIZATION; OPTIMAL BIT ALLOCATION; LAGRANGE MULTIPLIER; ALGORITHM; QUALITY; MODEL;
D O I
10.1109/TBC.2019.2917402
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
Although high efficiency video coding (HEVC) has achieved high coding performance, it has been shown that dependent rate-distortion optimization (RDO) can still further improve the coding performance at the encoder side. Inspired by our previous work on temporal-dependent RDO, this paper proposes a rate control method at coding tree unit (CTU) level to obtain both higher rate-distortion (R-D) performance and lower bitrate errors. We first formulate the global optimization problem in hybrid video coding and present a general solution framework based on a weighted Lagrange multiplier, where the weighted coefficient is related to the strength of temporal dependency among coding units, and a propagation factor is introduced for quantitative measurement of the temporal dependency. Second, an estimation method of CTU level R-D model is proposed to characterize R-D relationship more accurately. Finally, under the constraint of frame level bit budget, a formulation combining inter-block dependency and R-D characteristic is developed for optimal bit allocation at the CTU level. In the process of encoding a frame, a relaxed constraint algorithm (RCA) and a strict constraint algorithm (SCA) are employed to reduce the difference between numbers of actual and target bits for the current frame, respectively. Experimental results demonstrate that, on the HEVC test model (HM-16.7), our methods including RCA and SCA achieve considerable R-D performance improvement with lower bitrate errors, outperforming the state-of-the-art schemes. It is worth mentioning that even compared with HEVC without rate control, the RCA can still achieve bitrate savings of 5.4% and 5.1% on average under configurations of low delay P and B frames, respectively.
引用
收藏
页码:113 / 126
页数:14
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