JVET-P0063 AHG16: Fix on local dual tree [Y. Zhao, H. Yang (Huawei), Z.-Y. Lin, T.-D. Chuang, C.-Y. Chen, C.-W. Hsu, Y.-W. Huang, S.-M. Lei (MediaTek)]
Discussed in Track B Saturday 1630 (GJS).
This contribution proposes two fixes to the local dual tree technique of JVET-O0050. The first fix normatively disallows BT/TT split that creates 4x4 luma blocks in an inter coding region, which removes redundant CU-split-related flags (e.g., split_cu_flag) and has -0.01% luma BD-rate impact in RA.
For this aspect see also JVET-P0624.
The second fix harmonizes JVET-O0050 with other color formats beyond YUV4:2:0, i.e., monochrome, YUV4:2:2 and YUV4:4:4. For this aspect, see the notes for JVET-P0406.
In addition, the contribution informatively discusses a way of maintaining luma delta QP at the encoder to fit the local dual tree, which was not mentioned in the JVET-O0050.
Decision (Ed.): The contribution also proposes some editorial refinements that may be considered by the editor.