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JBE, vol. 24, no. 1, pp.25-31, January, 2019

DOI: https://doi.org/10.5909/JBE.2019.24.1.25

Geometry Padding for Segmented Sphere Projection (SSP) in 360 Video

Hyun-Ho Kim, Sang-Jin Myeong, Yong-Uk Yoon, and Jae-Gon Kim

C.A E-mail: jgkim@kau.ac.kr

Abstract:

360 video is attracting attention as immersive media, and is also considered in VVC (Versatile Video Coding), which is being developed in JVET (Joint Video Expert Team) as a new video coding standard of post-HEVC. A 2D image projected from 360 video for its compression may has discontinuities between the projected faces and inactive regions, and they may cause the visual artifacts in the reconstructed video as well as decrease of coding efficiency. In this paper, we propose a method of efficient geometric padding to reduce these discontinuities and inactive regions in the projection format of SSP (Segmented Sphere Projection). Experimental results show that the proposed method improves subjective quality compared to the existing padding of SSP that uses copy padding with minor loss of coding gain.



Keyword: Versatile Video Coding (VVC), JVET, 360 video, visual artifact, padding

Reference:
[1] J. Ohm, M. Wien, “Future Video Coding – Tools and Developments beyond HEVC,” in Proc. ICIP 2017, Oct. 2017.
[2] 360Lib, [Online]. Available at: https://jvet.hhi.fraunhofer.de/svn/svn_ 360Lib/
[3] Y. Ye, E. Alshina, and J. Boyce, “Algorithm descriptions of projection format conversion and video quality metrics in 360Lib (Version 5),” Joint Video Exploration Team of ITU-T SG16 WP3 and ISO/IEC JTC1/ SC29/WG11, JVET-H1004, 8th Meeting, Oct. 2017.
[4] C. Zhang, Y. Lu, J. Li, and Z. Wen, “AHG8: Segmented Sphere Projection for 360-degree video,” Joint Video Exploration Team of ITU-T SG16 WP3 and ISO/IEC JTC1/SC29/WG11, JVET-E0025, Jan. 2017.
[5] Y.-H. Lee, H.-C. Lin, J.-L. Lin, S.-K. Chang, C.-C. Ju, “EE4: ERP/ EAP-based segmented sphere projection with different padding sizes,” Joint Video Exploration Team of ITU-T SG16 WP3 and ISO/IEC JTC1/SC29/WG11, JVET-G0097, Jul. 2017.
[6] HM reference software, [Online]. Available at: https://hevc.hhi. fraunhofer.de/svn/svn_HEVCSoftware/
[7] J. Boyce, E. Alshina, and D. Zeng, “Subjective testing method for comparison of 360 video projection formats using HEVC,” Joint Video Exploration Team of ITU-T SG16 WP3 and ISO/IEC JTC1/SC29/ WG11, JVET-F1004, Mar. 2017.

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