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18th Meeting: Teleconference, April 2020 2020-04-22 10:00
AHG9: On high level control parameters
Authors: Han Huang Qualcomm Yao-Jen Chang Qualcomm Muhammed Coban Qualcomm W.-J. Chien Qualcomm Vadim Seregin Qualcomm Marta Karczewicz Qualcomm
Abstract
The contribution proposes the following changes on high level tool control syntax elements.
Meeting Notes
JVET-R0287 AHG9: On high level control parameters [H. Huang, Y.-J. Chang, M. Coban, W.-J. Chien, V. Seregin, M. Karczewicz (Qualcomm)]

The contribution proposes the following changes on high level tool control syntax elements.

  1. Signal qtbtt_dual_tree_intra_flag in PH for dual-tree on/off control
  2. Signal log2_transform_skip_max_size_minus2 with u(2) used for the maximum block size used for transform skip.

It is claimed that for some sequences the picture based control of dual tree provides compression benefit (not in CTC) for I-frame only coding. Some other opinion was raised that usage of dual tree is more commonly controlled at sequence level. No action was taken on this.

It is further proposed to change the signalling of log2_transform_skip_max_size_minus2 from ue(v) to u(2) for saving one bit in SPS. It is howeer pointed out that the ue(v) code may have less bits in the most common case. No action on this.

General and misc. HLS topics (9)

Discussion started here for AHG Session 1.9 on Wednesday 8 April at 1300 UTC (chaired by GJS & YKW).

PATENTS:
US10931953B2 0.34 2021-02-23 WO/2025/080376 0.34 WO/2024/081552 0.33 EP3843407A1 0.32 2021-06-30 WO/2025/006760 0.32 20240015333 0.31 CN101411208A 0.30 2009-04-15 20250260841 0.30
ARCHIVE v2 :
JVET-R0287-SpecChange.docx JVET-R0287-SW.zip JVET-R0287.docx ~$ET-Q0331.docx ~$ET-R0287.docx
Decisions
Discussion started here for AHG Session 1.9 on Wednesday 8 April at 1300 UTC (chaired by GJS & YKW).
Citation