Adeel Abbas, David Newman, Srilakshmi Akula, Akhil Konda
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Next Generation Video Coding for Spherical Content
Recently, the Joint Video Exploration Team (JVET) issued a Call for Proposals (CFP) for video compression technology that is expected to be successor to HEVC. In this paper, we present some of the technology from our joint response in the 360° video category of CFP. Goal was to keep design as simple as possible, with picture level preprocessing and without 360 specific coding tools. The response is based on a relatively new projection called Rotated Sphere Projection (RSP). RSP splits and surrounds the sphere using two faces that are cropped from Equirectangular Projection (ERP), in the same way as two flat pieces of rubber are stitched to form a tennis ball. This approach allows RSP to get closer to the sphere than Cube Map, achieving more continuity while preserving 3:2 aspect ratio. Our results show an average BDrate Luma coding gain of 10.5% compared to ERP using HEVC.
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