| JCTVC-M0099 AHG5: Using zero-depth chroma transform unit for 4:2:2 format [J. Kim (LG)]
(Discussion chaired by D. Flynn.)
This contribution proposes to provide a zero-depth chroma transform option for the 4:2:2 format, where an encoder can choose to use derive the chroma residual quad tree from luma as per the current design, or to force the chroma RQT to have a depth of zero. When the luma RQT contains a split, a flag is signalled to indicate that the chroma residual quadtree is same as luma or not. The reported gains are 0.0%, 1.3%, 1.6% for AIMT, 0.0%, 0.8%, 0.9% for AIHT, and 0.0%, 0.6%, 0.5% for AIST in average. It also reports 0.2%, 1.0%, 1.3% and 0.3%, 0.4%, 0.4% gain for RAMT and RAHT respectively and 0.2%, 0.4%, 0.6% and 0.3%, −0.1%, −0.5% gain for LBMT and LBHT respectively.
Encoder runtime increases of between 7% (for all-intra) and 20% (for low-delay-B) are reported.
No action.
Dostları ilə paylaş: |
