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Title: 360-degree intra coding mode for equirectangular projection format videos
Authors: Tsang, SK 
Chan, YL 
Issue Date: 2020
Source: In 2020 IEEE International Symposium on Circuits and Systems (ISCAS) proceedings : virtual conference, October 10-21, 2020, 2020, 9180456
Abstract: Recent advances in display, networking, and computing technologies have resulted in changing industry focus towards 360-degree/omnidirectional images as witnessed by increased interest in virtual reality (VR) and augmented reality (AR). Numerous curves are generated for 360-degree images due to the lens curvature and projection format. However, in High Efficiency Video Coding (HEVC), the conventional angular intra modes cannot handle them well since only straight lines can be predicted. More enhanced 360-degree image coding is essential for higher efficiency of storage and transmission. Therefore, we propose a new coding mode, called 360-degree intra mode, for predicting the coding units with curves. Experimental results show that our 360-degree intra mode improves the coding efficiency of HEVC by 0.32% on average and up to 0.74% Bj⊘ntegaard delta bit rate reduction.
Keywords: 360-degree intra coding
Equirectangular projection (ERP)
Virtual reality
ISBN: 978-1-7281-3320-1 (Print)
DOI: 10.1109/ISCAS45731.2020.9180456
Rights: © 2020 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
The following publication S. -H. Tsang and Y. -L. Chan, "360-Degree Intra Coding Mode for Equirectangular Projection Format Videos," 2020 IEEE International Symposium on Circuits and Systems (ISCAS), 2020, pp. 1-5 is available at
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