Back to Search Document details
18th Meeting: Teleconference, April 2020 2020-04-06 17:24
AHG9: Clean-up of tile signalling
Authors: J. Luo Alibaba Jie Chen Alibaba Y. Ye Alibaba
Abstract
In VVC draft 8, the syntax allows indicating a sum of tile widths/heights that is wider than the picture width/height. It is asserted that constrains of tile partitioning is not straightforward. If the sum of signaled tile widths/heights is larger than picture width/height, the current derivation could cause invalid CTU addresses being added to a slice. In this contribution, it is proposed to add two conformance constraints to make the conformance requirements on tile partitioning cleaner, such that invalid CTU address would not be included in a slice. In the second version, the conformance requirement on tileColBd and tileRowBd is added.
Meeting Notes
JVET-R0221 AHG9: Clean-up of tile signalling [J. Luo, J. Chen, Y. Ye (Alibaba)]

Discussed in AHG Session 1.6 Tuesday 7 April at 1555 UTC (chaired by GJS & YKW).

In VVC draft 8, the syntax allows indicating a sum of tile widths/heights that is wider than the picture width/height. It is asserted that the constraints of tile partitioning is not straightforward. If the sum of signalled tile widths/heights is larger than picture width/height, the current derivation could cause invalid CTU addresses being added to a slice. In this contribution, it is proposed to add two conformance constraints to make the conformance requirements on tile partitioning cleaner, such that invalid CTU address would not be included in a slice. In the second version, the conformance requirement on tileColBd and tileRowBd is added.

JVET-Q0359 was a related proposal of the last meeting. The proponent reported that there was still an editorial error in the constraint expression.

This is an editorial bug fix proposal.

AHG Recommendation (expression of existing intent): The editor is asked to ensure that the text adequately expresses the necessary constraints, such that tiles, slices, and subpictures are a proper partitioning of the picture (no overlaps, no gaps, no CTUs that are outside the picture).

References:
JVET-Q0359 JVET-Q2001
Cited:
JVET-AA0003 JVET-AQ0003 JVET-R2001 JVET-S0002 JVET-S0003 JVET-S0052 JVET-S0085 JVET-S0123 JVET-S0152 JVET-S0161 JVET-S0171 JVET-S0187 JVET-S0229 JVET-S0248 JVET-S0256 JVET-S0266 JVET-S0269 JVET-S2001 JVET-T0003 JVET-U0003 more than 20
PATENTS:
20250168385 0.34 20230421795 0.33 20210203971 0.32 WO/2021/133519 0.31 WO/2021/202385 0.30 20260052278 0.28 20240048772 0.27 20210368210 0.26
ARCHIVE v2 :
._JVET-R0221-r2.docx JVET-R0221-r2.docx
Decisions
AHG Recommendation (expression of existing intent): The editor is asked to ensure that the text adequately expresses the necessary constraints, such that tiles, slices, and subpictures are a proper partitioning of the picture (no overlaps, no gaps, no CTUs that are outside the picture).
Citation