JVET-R0188 AHG12: On signalling of rectangular slice height and width [Hendry, S. Kim, S. Paluri (LGE)]
Discussion began here for Track A on 18 April at 1520 UTC (chaired by GJS & YKW).
This contribution proposed replacing one condition (i.e., not signalling the syntax element when there is only one tile column or row) in the signalling of slice_width_in_tiles_minus1[ i ] and slice_height_in_tiles_minus1[ i ]. The replacement conditions are as follows:
- When the first tile of a rectangular slice is one of the tile(s) at the last tile column of the picture, the syntax element slice_width_in_tiles_minus1[ i ] is not present and inferred to be equal to 0.
- When the first tile (i.e., the tile at the top-left corner) of a rectangular slice is one of the tile(s) at the last tile row of the picture, the syntax element slice_height_in_tiles_minus1[ i ] is not present and inferred to be equal to 0.
It is remarked that the information about the first tile of a rectangular slice, the last tile column and the last tile row are already available in the current VVC working draft.
In the first revision of this contribution the proposed spec text was updated to remove unnecessary part and editorial update was made.
It was commented that the same condition is already evaluated for some other similar cases.
It was commented that JVET-R0211 item 3 and JVET-R0209 have the same method.
The proposal does not seem to complicate the syntax structure, just generalizes the use of inference of 0 when the syntax element is already required to be equal to 0.
Decision (sensibility cleanup): Adopt.