Paper Info
Title
Temporal dependency based CTU-level bit allocation for rate control
Abstract
Rate control ensures the coded bit stream can meet channel bandwidth or storage space requirements. however, it may degrade rate-distortion (R-D) performance of encoders. Inspired by temporal dependent rate distortion optimization, this paper proposes a temporal dependency based CTU level rate control algorithm to improve R-D performance while achieving a high bitrate accuracy. First, an estimation method of CTU level R-D model is proposed to better characterize R-D relationship. Second, a formulation combining inter-CTU dependencies and R-D characteristics is constructed for CTU level bit allocation, which aims to minimize the distortion of the whole video sequence under the constraint of frame level bit budget. Finally, in the process of encoding a frame, a strict constraint of bits is used to reduce the difference between numbers of actual and target bits for the current frame. Experimental results show that, on the platform of HEVC test model (HM-16.7), the proposed algorithm achieves considerable R-D performance improvement with smaller bitrate error. Specifically, against HM-16.7 without rate control, the proposed scheme achieves bitrate savings of 4.2% and 3.7% on average under the configurations of low delay P and B frames, respectively.
Year
DOI
Venue
2019
10.1109/BMSB47279.2019.8971845
2019 IEEE International Symposium on Broadband Multimedia Systems and Broadcasting (BMSB)
Keywords
Field
DocType
Video coding,high efficiency video coding (HEVC),rate-distortion optimization (RDO),rate control
Computer science,Algorithm,Real-time computing,Encoder,Bitstream,Distortion,Channel capacity,Video compression picture types,Rate–distortion optimization,Performance improvement,Encoding (memory)
Conference
ISSN
ISBN
Citations 
2155-5044
978-1-7281-2151-2
0
PageRank 
References 
Authors
0.34
0
4
Name
Order
Citations
PageRank
Hongwei Guo151.43
Ce Zhu21473117.79
Mai Xu350957.90
Shuai Li410220.53