Spherical rotation orientation indication for HEVC and JEM coding of 360 degree video

Jill Boyce; Qian Xu

doi:10.1117/12.2274765

19 September 2017 Spherical rotation orientation indication for HEVC and JEM coding of 360 degree video

Jill Boyce, Qian Xu

Proceedings Volume 10396, Applications of Digital Image Processing XL; 103960I (2017) https://doi.org/10.1117/12.2274765
Event: SPIE Optical Engineering + Applications, 2017, San Diego, California, United States

Abstract

Omnidirectional (or "360 degree") video, representing a panoramic view of a spherical 360° ×180° scene, can be encoded using conventional video compression standards, once it has been projection mapped to a 2D rectangular format. Equirectangular projection format is currently used for mapping 360 degree video to a rectangular representation for coding using HEVC/JEM. However, video in the top and bottom regions of the image, corresponding to the "north pole" and "south pole" of the spherical representation, is significantly warped. We propose to perform spherical rotation of the input video prior to HEVC/JEM encoding in order to improve the coding efficiency, and to signal parameters in a supplemental enhancement information (SEI) message that describe the inverse rotation process recommended to be applied following HEVC/JEM decoding, prior to display. Experiment results show that up to 17.8% bitrate gain (using the WS-PSNR end-to-end metric) can be achieved for the Chairlift sequence using HM16.15 and 11.9% gain using JEM6.0, and an average gain of 2.9% for HM16.15 and 2.2% for JEM6.0.

Conference Presentation

Citation Download Citation

Jill Boyce and Qian Xu "Spherical rotation orientation indication for HEVC and JEM coding of 360 degree video", Proc. SPIE 10396, Applications of Digital Image Processing XL, 103960I (19 September 2017); https://doi.org/10.1117/12.2274765

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