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17th Meeting: Brussels, January 2020 2020-01-10 14:47
Clipping flag clean-up for chroma adaptive loop filters
Authors: Nan Hu Qualcomm Vadim Seregin Qualcomm Marta Karczewicz Qualcomm
Abstract
In VVC draft 7, one adaptation parameter set can signal up to 8 chroma filters. One clipping flag is signalled for each chroma filter to control whether clipping is applied for this filter or not. In this contribution, it is proposed to apply one clipping flag to all chroma filters in one adaptation parameter set. Under common test conditions, compared to VTM-7.0 anchor, similar overall coding efficiency and running time are observed.
Meeting Notes
JVET-Q0249 Clipping flag clean-up for chroma adaptive loop filters [N. Hu, V. Seregin, M. Karczewicz (Qualcomm)]

In VVC draft 7, one adaptation parameter set can signal up to 8 chroma filters. One clipping flag is signalled for each chroma filter to control whether clipping is applied for this filter or not. In this contribution, it is proposed to apply one clipping flag to all chroma filters in one adaptation parameter set. Under common test conditions, compared to VTM-7.0 anchor, similar overall coding efficiency and running time are observed.

Question: Why was it designed in a way that each chroma filter has its own clipping flag?

The original proponents would agree that this makes the design more consistent.

Decision (cleanup): Adopt JVET-Q0249.

References:
JVET-N1010
Cited:
JVET-Q0690 X JVET-Q2001 JVET-R0002 JVET-R0003 JVET-R0013 JVET-R0060 JVET-R0081 JVET-R0082 JVET-R0141 JVET-R0142 JVET-R0208 JVET-R0218 JVET-R0219 JVET-R0305 JVET-R0350 JVET-R0370 JVET-R0392 JVET-R0481 JVET-R2001 JVET-S0013 more than 20
PATENTS:
3151525 0.70 20170105004 0.33 20170105005 0.32 20230120726 0.31 WO/2017/062377 0.30 WO/2017/062373 0.28 20210368210 0.27 WO/2021/237220 0.26
ARCHIVE v2 :
JVET-Q0249.docx JVET-Q0249.pptx VTM-7.0-vs-OneChromaClipFlag.xlsm
Decisions
adopted
Decision (cleanup): Adopt JVET-Q0249.
Citation