JVET-AL0310 AHG 9: On signalling of resampling type for EOI SEI message [C. Kim, H. Tan (LGE), J. Xu, Y.-K. Wang (Bytedance)] [late]

This contribution provides a solution option for the problem assertd by contribution JVET-AL0123 item 10. It is asserted that the problem of different resampling types for different dimensions is a valid problem.

This contribution proposes to use two indications for signalling the resampling types (i.e., for horizontal and vertical dimensions) in encoder optimization information (EOI) SEI message. The detail of the suggested modification is as follows:

1. Replace the current syntax element eoi_spatial_resampling_type_flag with two 2-bits indication syntax elements called eoi_spatial_hor_resampling_type_idc and eoi_spatial_ver_resampling_type_idc.
2. For each idc, the semantics of the values is as follows:
   • 0 means no resampling is applied in that dimension.
   • 1 means subsampling is applied in that dimension.
   • 2 means upsampling is applied in that dimension.
   • 3 is reserved.
3. Add a constraint such that when these two indications are present, their values shall not both be equal to 0.

Compared with the modification suggested in JVET-AL0123, where two flags are used to indicate resampling type in two dimensions, the solution described in this contribution provides more resampling information.

See the notes under JVET-AL0123 item 10.

Object mask information SEI message (3)

Contributions in this area were discussed during 1600–1700 Thursday 27 March 2025, with follow-up on Friday 28 March (chaired by S. Deshpande).