19 September 2017 Intra prediction using face continuity in 360-degree video coding
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Abstract
This paper presents a new reference sample derivation method for intra prediction in 360-degree video coding. Unlike the conventional reference sample derivation method for 2D video coding, which uses the samples located directly above and on the left of the current block, the proposed method considers the spherical nature of 360-degree video when deriving reference samples located outside the current face to which the block belongs, and derives reference samples that are geometric neighbors on the sphere. The proposed reference sample derivation method was implemented in the Joint Exploration Model 3.0 (JEM-3.0) for the cubemap projection format. Simulation results for the all intra configuration show that, when compared with the conventional reference sample derivation method, the proposed method gives, on average, luma BD-rate reduction of 0.3% in terms of the weighted spherical PSNR (WS-PSNR) and spherical PSNR (SPSNR) metrics.
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Philippe Hanhart, Yuwen He, Yan Ye, "Intra prediction using face continuity in 360-degree video coding", Proc. SPIE 10396, Applications of Digital Image Processing XL, 103960W (19 September 2017); doi: 10.1117/12.2272712; https://doi.org/10.1117/12.2272712
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