JVET-AO0064 AHG9/AHG13: On Film Grain Regions Characteristics SEI Message [S. Deshpande, J. Samuelsson-Allendes (Sharp)]

This contribution relates to modifications to film grain regions characteristics (FGRC) SEI message, which is included in the Technologies under consideration for future extensions of VSEI. Following is proposed:

• Proposal 1: It is proposed to signal fgr_regions_model_id[ i ] for the i–th region in the picture, only when fgr_film_grain_enabled_flag[ i ] is equal to 1 and fgr_single_model_flag is equal to 0. The inference rule for fgr_regions_model_id[ i ] is also modified when it is not present.
• Proposal 2: It is proposed to modify the inference for fgr_comp_model_value[ m ][ c ][ i ][ 0 ] when not present. It is proposed to infer fgr_comp_model_value[ m ][ c ][ i ][ 0 ] to be equal to 0 when not present.
• Proposal 3: It is proposed to signal the syntax elements fgr_region_top[ i ], fgr_region_left[ i ], fgr_region_width[ i ], and fgr_region_height[ i ] with ue(v) coding instead of u(16) coding. Alternatively, it is proposed to signal a syntax element which specifies the length of these syntax elements and then to code them with u(v) coding.

JVET-AO104 item 1 is similar to proposal 1, but with different syntax. This contribution’s proposal 1 was preferred.

Proposal 1, proposal 2, and proposal 3 were agreed.

JVET-AO0064 AHG9/AHG13: On Film Grain Regions Characteristics SEI Message