Fast intra-mode decision algorithm for virtual reality 360 degree video based on decision tree and texture direction

Zhi Liu; Wei Ning; Xianya Fu; Mengmeng Zhang; Yuhao Wang

doi:10.1117/12.2572989

12 June 2020 Fast intra-mode decision algorithm for virtual reality 360 degree video based on decision tree and texture direction

Zhi Liu, Wei Ning, Xianya Fu, Mengmeng Zhang, Yuhao Wang

Author Affiliations +

Proceedings Volume 11519, Twelfth International Conference on Digital Image Processing (ICDIP 2020); 1151919 (2020) https://doi.org/10.1117/12.2572989
Event: Twelfth International Conference on Digital Image Processing, 2020, Osaka, Japan

Abstract

Virtual reality 360-degree video is now widely used in various fields. However, the huge amount of data caused by its high resolution increases the coding complexity. While the existing video coding framework, such as HEVC, is not optimized according to the characteristics of virtual reality video, in order to accelerate the speed of intra-mode decision process in video coding, a new algorithm is proposed in this paper. Each virtual reality 360-degree video frame is divided into two regions, namely the pole region and the equatorial region. The number of candidate modes in the pole region is reduced in advance according to the statistical distribution pattern of the modes, and intra-mode in the equatorial region is determined by the cart decision tree using the texture contrast of the coding unit. The experimental results show that compared with the original HM16.20, the proposed algorithm can save the coding time by 28.3%, while only increasing the bd-rate by 0.612%.

Citation Download Citation

Zhi Liu, Wei Ning, Xianya Fu, Mengmeng Zhang, and Yuhao Wang "Fast intra-mode decision algorithm for virtual reality 360 degree video based on decision tree and texture direction", Proc. SPIE 11519, Twelfth International Conference on Digital Image Processing (ICDIP 2020), 1151919 (12 June 2020); https://doi.org/10.1117/12.2572989

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