Adaptive bit allocation scheme for extremely low-delay intraframe rate control in high efficiency video coding

Hongwei Lin; Xiaohai He; Qi-Zhi Teng; Wenjie Fu; Shuhua Xiong

doi:10.1117/1.JEI.25.4.043008

15 July 2016 Adaptive bit allocation scheme for extremely low-delay intraframe rate control in high efficiency video coding

Hongwei Lin, Xiaohai He, Qi-Zhi Teng, Wenjie Fu, Shuhua Xiong

Author Affiliations +

Funded by: National Natural Science Foundation of China (NSFC), National Natural Science Foundation of China, Natural Science Foundation of China, Applied Basic Research Project of Sichuan Province, Science Technology Program of Sichuan Province, 2014 Graduate education reform and innovation project of Sichuan Department of Education, Fundamental Research Funds for the Central Universities

Journal of Electronic Imaging, Vol. 25, Issue 4, 043008 (July 2016). https://doi.org/10.1117/1.JEI.25.4.043008

Abstract

Most existing intraframe rate control algorithms for the high efficiency video coding (HEVC) standard do not consider the extremely low end-to-end delay required by various applications. An intraframe extremely low-delay rate control scheme for HEVC is presented. First, compared with existing intraframe complexity estimation methods in HEVC, the proposed scheme provides a more accurate complexity estimation method by considering spatial–temporal complexity correlations. Second, based on the proposed complexity estimation method, a linear relationship is modeled between the encoding bit rate and the complexity estimated at the largest coding units (LCU) level. Finally, in order to meet the extremely low-delay constraint, an adaptive bit allocation scheme is proposed, in which the rate control starts as soon as the first LCU row of each frame becomes available. Compared with existing intraframe rate control schemes in HEVC, in which the buffer size is far greater than the number of bits needed for encoding one frame, the proposed rate control scheme has a buffer size that is approximately one-third the average number of bits for encoding one frame in order to achieve extremely low delay. Experimental results show that the proposed scheme can keep the buffer in an extreme low status along with reliable coding performance.

Citation Download Citation

Hongwei Lin, Xiaohai He, Qi-Zhi Teng, Wenjie Fu, and Shuhua Xiong "Adaptive bit allocation scheme for extremely low-delay intraframe rate control in high efficiency video coding," Journal of Electronic Imaging 25(4), 043008 (15 July 2016). https://doi.org/10.1117/1.JEI.25.4.043008

Published: 15 July 2016

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