JVET-F0036 AHG8: Rotated Sphere Projection for 360° Video [A. Abbas, D. Newman (GoPro)]
This contribution provides a description of rotated sphere projection (RSP) for 360° video. RSP represents 360° video using only two faces that are arranged in two rows. The top face is directly cropped from the middle 270°x90° of ERP, and the bottom face is cropped from the middle 270°x90° of ERP after performing a spherical rotation by 180° along the Y-axis and 90° along the X-axis. Average coding gains of 10.5%, 4.5% and 5.2% were reported for WS-PSNR-E2E metrics.
It was claimed that the method requires 6% less pixels to be coded; however the cutoff towards uncoded pixels has a circular shape and cannot well be covered by the square blocks of HEVC.
Several experts expressed interest in this.
Decision (SW): Include in the 360Lib software.
It was noted that this projection format was also requested to be included in OMAF; therefore OMAF should exercise an “evil viewport” experiment. The evil viewports of this format need to be defined. Subjective testing was to be performed by the OMAF activity.
JVET-F0036 AHG8: Rotated Sphere Projection for 360° Video [A. Abbas, D. Newman (GoPro)]
Include in 360Lib.