JVET-F0053 AHG8: An improvement on compact octahedron projection with padding [Y.-H. Lee, H.-C. Lin, J.-L. Lin, S.-K. Chang, C.-C. Ju (MediaTek)]
Discussion chaired by J. Boyce
This contribution proposes a modification on the compact octahedron projection layout (COHP) by padding additional pixel samples at the discontinuous edges. The padded samples reportedly improve the compression efficiency and significantly reduce the appeared artefact when rendering around discontinuous edges. As compared to the COHP without padding, the experimental results reportedly demonstrate that the BD bit rate reduction provided by the proposed padding scheme is 0.7%, 1.6%, and 1.5% in end-to-end WS-PSNR-Y, WS-PSNR-U, and WS-PSNR-V, respectively, while the virtual artefacts on the discontinuous edges are also reportedly reduced.
This adds 16 pixel wide padding to discontinuous edges. It doesn’t reduce face size, because even with the padding, the increased coded picture size fits into the previous limit of coded picture size. It is similar in concept to the padding used for CISP.
Decision (SW): Change the COHP1 design in the 360Lib software and update the CTC accordingly.
JVET-F0053 AHG8: An improvement on compact octahedron projection with padding [Y.-H. Lee, H.-C. Lin, J.-L. Lin, S.-K. Chang, C.-C. Ju (MediaTek)]
Change the COHP1 design in the 360Lib software and update the CTC accordingly.