JVET-F0108 Padded ERP (PERP) projection format [J. Boyce, A. Tourapis, C. Fogg] [late]

Presented Thu 6^th afternoon (chaired by JRO)

It was proposed to add a new projection format to the 360Lib software for a variation of the equirectangular projection (ERP) format that adds padding, referred to as padded ERP format (PERP). This would enable the 360Lib software to support a feature included in JCTVC-AA0044 for the omnidirectional projection indication SEI message that allows the value of the yaw_range to represent more than 360 degrees for ERP sequences.

It was commented that now cropping has to be done in rendering. Furthermore, to prevent artefacts, it is necessary to discard samples from both left and right hand sides. It was suggested that therefore, it might be better to symmetrically pad samples both on left and right hand side, because otherwise the 0 degree angle would not be in the center of the picture.

It was also mentioned that using SCC profile could be more efficient by using CPR (aka IBC) for coding overlapping regions.

It was proposed to add this to the 360Lib software.

It was planned to include this in EE4 (symmetric center-based as described above) and a related branch of 360Lib; visual testing is to be done in the EE context.

Testing procedure and metrics (8)

Subjective testing contributions (5)

Contributions in this area were discussed Saturday 1615–1930, chaired by JRO.