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29th Meeting: by teleconference, DE, January 2023 2023-01-04 20:32
AHG9: On the NNPFC SEI message update and activation
Authors: Hendry LGE Junghak Nam LGE Hyeongmun Jang LGE S. Kim LGE J. Lim LGE
Abstract
It is asserted that the current VSEI specification is not clear about which neural-network post-filter (NNPF) applies to a picture when an NNPFC SEI message containing an update filter is present, prior to the picture, in the bitstream after an NNPFC SEI message containing the base filter has been activated. The asserted problem in such situation is which filter to be applied to the picture, the base filter (i.e., the filter in the NNPFC SEI message that is present prior to the NNPFA SEI message) or the updated filter (i.e., the filter in the NNPFC SEI message that is present after the NNPFA SEI message).
Meeting Notes
JVET-AC0129 AHG9: On the NNPFC SEI message update and activation [Hendry, J. Nam, H. Jang, S. Kim, J. Lim (LGE)]

It is asserted that the current VSEI specification is not clear about which neural-network post-filter (NNPF) applies to a picture when an NNPFC SEI message containing an update filter is present, prior to the picture, in the bitstream after an NNPFC SEI message containing the base filter has been activated. The asserted problem in such situation is which filter to be applied to the picture, the base filter (i.e., the filter in the NNPFC SEI message that is present prior to the NNPFA SEI message) or the updated filter (i.e., the filter in the NNPFC SEI message that is present after the NNPFA SEI message).

In this contribution, three possible solutions were presented as follows:

  1. Specifying that the NNPF that applies to a picture is the one that is in the NNPFC that immediately precedes the picture in output order.
  2. Specifying that the NNPF that applies to a picture is the one that is in the NNPFC that immediately precedes the NNPFA in output order.
  3. Specifying that when an NNPFC SEI message is present, it cancels the persistence of previous NNPFA SEI message with the same ID, if present.

The authors proposed that option 2 (first choice) or option 3 (second choice) are used to solve the asserted problem.

ARCHIVE :
._JVET-AC0129_v1.docx JVET-AC0129_v1.docx
Decisions
The authors proposed that option 2 (first choice) or option 3 (second choice) are used to solve the asserted problem.
Citation