Fast Intra Prediction and CU Partition Algorithm for Virtual Reality 360 Degree Video Coding

Zhi LIU  Cai XU  Mengmeng ZHANG  Wen YUE  

IEICE TRANSACTIONS on Information and Systems   Vol.E102-D   No.3   pp.666-669
Publication Date: 2019/03/01
Online ISSN: 1745-1361
DOI: 10.1587/transinf.2018EDL8098
Type of Manuscript: LETTER
Category: Image Processing and Video Processing
360 degree video,  CMP format,  HEVC,  fast intra coding,  

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Virtual Reality (VR) 360 degree video has ultra-high definition. Reducing the coding complexity becomes a key consideration in coding algorithm design. In this paper, a novel candidate mode pruning process is introduced between Rough Mode Decision and Most Probable Mode based on the statistical analysis of the intra-coding parameters used in VR 360 degree video coding under Cubemap projection (CMP) format. In addition, updated coding bits thresholds for VR 360 degree video are designed in the proposed algorithm. The experimental results show that the proposed algorithm brings 38.73% and 23.70% saving in average coding time at the cost of only 1.4% and 2.1% Bjontegaard delta rate increase in All-Intra mode and Randomaccess mode, respectively.