Evaluation of H.265 and H.264 for Panoramas Video under Different Map Projections

Abstract

Various map projection methods are proposed to convert a VR omnidirectional video to a 2D planar video, including Mercator, Equirectangular, Equal-area, Cube projections. The BD-rate comparison of the different map projections has been conducted. However, the performance of the map projections has not been compared using different codec, like widely-used x265 and x264 encoders. In this paper, both x265 and x264 are used to test the performance among the map projections, while S-PSNR is set as metric to calculate the BDrate between H.265 and H.264. Results show that the rate savings of H.265 over H.264 varies from 36.4% to 40.8% in different map projections and Equal-area has lowest bitrate savings of H.265 over H.264. What is more, this paper verifies the performance of the different map projections. Equal-area has the best performance while Mercator has intolerable performance. Last but not least, Equal-area has more bitrate savings relative to Equirectangular using x264 compared with x265.

Publication
The 9th international conference on ubi-media computing (UMEDIA 2016)
Li Song
Li Song
Professor, IEEE Senior Member
Nam Ling
Nam Ling
Professor,IEEE Fellow