Back to Search Document details
29th Meeting: by teleconference, DE, January 2023 2023-01-11 00:38
AHG9: On bugfix for NNPFC and NNPFA SEI messages
Authors: Takeshi Chujoh Sharp Yukinobu Yasugi Sharp Tomohiro Ikai Sharp
Abstract
In this contribution, several problems of NNPFC (neural-network post-filter characteristics) SEI and NNPFA (neural-network post-filter activation) SEI messages are reported, and their solutions are proposed. The first problem is the syntax of NNPFC SEI is not correct when the value of nnpfc_purpose is equal to 4, which is solved by a syntax change. The second problem is even if nnpfc_inp_format_idc is equal to 1, a filtering strength control value, StrengthControlVal, is a real number in the range of 0 to 1, which is solved by adding an equation for the transform to an unsigned integer. The third problem is if the output order is different from the decoding order, the encoder may not be able to decide the persistence of post-filter processing, which is solved by adding a flag indicating the order when nnpfa_persistence_flag of NNPFA SEI is equal to 1.
Meeting Notes
JVET-AC0047 AHG9: On bugfix for NNPFC and NNPFA SEI messages [T. Chujoh, Y. Yasugi, T. Ikai (Sharp)]

In this contribution, several problems of NNPFC (neural-network post-filter characteristics) SEI and NNPFA (neural-network post-filter activation) SEI messages are reported, and their solutions are proposed. The first problem is the syntax of NNPFC SEI is not correct when the value of nnpfc_purpose is equal to 4, which is solved by a syntax change. The second problem is even if nnpfc_inp_format_idc is equal to 1, a filtering strength control value, StrengthControlVal, is a real number in the range of 0 to 1, which is solved by adding an equation for the transform to an unsigned integer. The third problem is if the output order is different from the decoding order, the encoder may not be able to decide the persistence of post-filter processing, which is solved by adding a flag indicating the order when nnpfa_persistence_flag of NNPFA SEI is equal to 1.

ARCHIVE :
JVET-AC0047-v2.docx
Decisions
In this contribution, several problems of NNPFC (neural-network post-filter characteristics) SEI and NNPFA (neural-network post-filter activation) SEI messages are reported, and their solutions are proposed. The first problem is the syntax of NNPFC SEI is not correct when the value of nnpfc_purpose is equal to 4, which is solved by a syntax change. The second problem is even if nnpfc_inp_format_idc is equal to 1, a filtering strength control value, StrengthControlVal, is a real number in the range of 0 to 1, which is solved by adding an equation for the transform to an unsigned integer. The third problem is if the output order is different from the decoding order, the encoder may not be able to decide the persistence of post-filter processing, which is solved by adding a flag indicating the order when nnpfa_persistence_flag of NNPFA SEI is equal to 1.
Citation