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39th Meeting: Daejeon, KR, March 2025 2025-04-01 08:44
AHG12: Reuse of ALF control information
Authors: Nan Hu Qualcomm H. Wang Qualcomm Marta Karczewicz Qualcomm Vadim Seregin Qualcomm
Abstract
In ECM-16.1, for each picture, ALF control information is signalled at both picture and CTB levels. In this proposal, CTB-level information chroma ALF and CCALF can be used by future frames. On top of ECM-16.1 following common test conditions, simulation results of the proposed method are reported below:
Meeting Notes
JVET-AL0220 AHG12: Reuse of ALF control information [N. Hu, H. Wang, M. Karczewicz, V. Seregin (Qualcomm)]

In ECM-16.1, for each picture, ALF control information is signalled at both picture and CTB levels. In this proposal, CTB-level information chroma ALF and CCALF can be used by future frames. On top of ECM-16.1 following common test conditions, simulation results of the proposed method are reported below:

Y

U

V

EncT

DecT

EncVmPeak

DecVmPeak

RA

-0.04%

-0.03%

0.06%

100.0%

99.9%

100.1%

100.2%

LDB

-0.04%

0.71%

0.67%

99.7%

100.1%

100.0%

100.0%

It was commented that similar methods are used in other loop filters. Some additional storage would be necessary, but there is some gain. The loss in chroma for LB is mostly due to class E, which may be due to further lowering the bit rate.

It was agreed to study this in an EE.

ARCHIVE :
JVET-AL0220-v1.docx JVET-AL0220-v2.docx JVET-AL0220.pptx JVET-AL0220.xlsm
Decisions
It was agreed to study this in an EE.
Citation