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39th Meeting: Daejeon, KR, March 2025 2025-03-20 01:55
AHG9: On image format metadata SEI message
Authors: J. Lee LGE Hendry Tan LGE Chulkeun Kim+ LGE Junghak Nam LGE J. Lim LGE S. Kim LGE
Abstract
This contribution proposes modifications that are asserted to provide improvement to some aspects of image format metadata (IFM) SEI message. The proposed modifications are as follows:
Meeting Notes
JVET-AL0128 AHG9: On image format metadata SEI message [J. Lee, H. Tan, C. Kim, J. Nam, J. Lim, S. Kim (LGE)]

Chaired by S. Deshpande on 1 April at 13:55.

This contribution proposes modifications that are asserted to provide improvement to some aspects of image format metadata (IFM) SEI message. The proposed modifications are as follows:

1 Change ifm_num_metadata_payloads to ifm_num_metadata_payloads_minus1, and specify the allowed value range of it.

See the notes under JVET-AL0068 item 1.

  1. Specify the allowed value range of ifm_type_id[ i ].

This is typically how we specify handling of reserved values. Agreed

  1. Specify the allowed value range of ifm_payload_len_minus1[ i ].

See the notes under JVET-AL0068 item 2.

  1. Remove the signalling of ifm_uri_present_flag[ i ] and move up ifm_payload_len_minus1[ i ] and change it to ifm_payload_len[ i ].

Proposed modification overloads the ifm_payload_len[ i ] syntax element for asserted simplification of syntax table. For data uri case the bits on the wire are same as in current specification. For the other case, 1 bit is saved. There was a comment that current design is less confusing and this change may be confusing. No action was taken on this.

JVET-AL0128 item 4 is related. See the additional notes about the discussion of these two items in that document. This is the current design intent. Mainly editorial. Agreed to take the suggested action.

JVET-AL0128 AHG9: On image format metadata SEI message [J. Lee, H. Tan, C. Kim, J. Nam, J. Lim, S. Kim (LGE)]

Chaired by S. Deshpande on 1 April at 13:55.

This contribution proposes modifications that are asserted to provide improvement to some aspects of image format metadata (IFM) SEI message. The proposed modifications are as follows:

1 Change ifm_num_metadata_payloads to ifm_num_metadata_payloads_minus1, and specify the allowed value range of it.

See the notes under JVET-AL0068 item 1.

Specify the allowed value range of ifm_type_id[ i ].

This is typically how we specify handling of reserved values. Agreed

Specify the allowed value range of ifm_payload_len_minus1[ i ].

See the notes under JVET-AL0068 item 2.

Remove the signalling of ifm_uri_present_flag[ i ] and move up ifm_payload_len_minus1[ i ] and change it to ifm_payload_len[ i ].

Proposed modification overloads the ifm_payload_len[ i ] syntax element for asserted simplification of syntax table. For data uri case the bits on the wire are same as in current specification. For the other case, 1 bit is saved. There was a comment that current design is less confusing and this change may be confusing. No action was taken on this.

ARCHIVE :
JVET-AL0128-v1.docx
Decisions
JVET-AL0128 item 4 is related. See the additional notes about the discussion of these two items in that document. This is the current design intent. Mainly editorial. Agreed to take the suggested action.
JVET-AL0128 item 4 is related. See the additional notes about the discussion of these two items in that document. This is the current design intent. Mainly editorial. Agreed to take the suggested action.
Proposed modification overloads the ifm_payload_len[ i ] syntax element for asserted simplification of syntax table. For data uri case the bits on the wire are same as in current specification. For the other case, 1 bit is saved. There was a comment that current design is less confusing and this change may be confusing. No action was taken on this.
Citation