JVET-AP0158 AHG9: On signalling of target picture in display overlays information SEI message [J. Lee, H. Tan, C. Kim, J. Nam, J. Lim, S. Kim (LGE)]

This contribution proposes modifications that are asserted to provide improvement to signalling of the target picture in the display overlays information SEI message in TuC for future extensions of VSEI. The proposed modifications are as follows:

1 On inference of target picture size

– Modify the inference of the target picture size such that when they are not present, they are inferred to be equal to the picture size of the first layer associated with the SEI message.

2 On signalling of chroma format

– Remove the constraint on the doi_target_pic_chroma_format_idc value.

– Move the position of doi_target_pic_chroma_format_idc such that it is optionally signalled.

– Specify that doi_target_pic_chroma_format_idc value is inferred when not present.

3 On signalling of bitdepth

– Move the position of doi_target_bitdepth_minus8 such that it is optionally signalled.

– Specify that doi_target_bitdepth_minus8 value is inferred when not present.

4 On checking full occupancy and overlay position / size

– Modify the constraint when doi_target_pic_full_occ_flag equal to 1 to cover the case where doi_resampling_enabled_flag is equal to 0.

– Modify the constraint on the size and position of overlays to cover the case where doi_resampling_enabled_flag is equal to 0.

Agreed to item 1, item 2. item 4.

For item 3, it was suggested to infer to the bit depthY rather than the max. Agreed to item 3 as modified.

Enhanced colour format information (ECFI) SEI message (4+1)

Contributions in this area were discussed during 1550–2000 on Thursday 30 April 2026 (chaired by J. Boyce).

JVET-AP0245 in 4.3 is also related.

JVET-AP0158 AHG9: On signalling of target picture in display overlays information SEI message

Enhanced colour format information (ECFI)