JVET-AC0062 AHG9: On NNPFC SEI Message [S. Deshpande, A. Sidiya (Sharp)]

Some modifications are proposed to the Neural-network post-filter characteristics (NNPFC) SEI Message. The following is proposed:

• Proposal A: It is proposed to modify a constraint when nnpfc_constant_patch_size_flag is equal to 1. It is asserted that without the proposed modification, the actual input size to the post-processing filter may not be a multiple of a specific value as may be required by some typical neural network post filters.
• Proposal B: It is proposed to define a valid value range for the two ue(v) coded syntax elements nnpfc_num_input_pics_minus2 and nnpfc_interpolated_pics[ i ]. Currently there is no range specified for these two syntax elements.