Opened 7 weeks ago

Closed 3 weeks ago

#1371 closed defect (fixed)

Incorrect subpicture boundaries

Reported by: bheng Owned by:
Priority: minor Milestone:
Component: spec Version: VVC D10 vG
Keywords: Cc: ksuehring, bbross, XiangLi, fbossen, jvet@…

Description

In equation 113, I believe SubpicRightBoundaryPos and SubpicBotBoundaryPos should be derived using the actual picture size from the PPS, not the maximum picture size from the SPS:

SubpicRightBoundaryPos = Min( sps_pic_width_max_in_luma_samples - 1, ... )

SubpicBotBoundaryPos = Min( sps_pic_height_max_in_luma_samples - 1, ... )

These boundaries are used in several TMVP equations, such as the following:

rightBoundaryPos = sps_subpic_treated_as_pic_flag[ CurrSubpicIdx ] ? SubpicRightBoundaryPos : pps_pic_width_in_luma_samples - 1 (585)

When not present, the value of sps_subpic_treated_as_pic_flag[ i ] is inferred to be equal to 1. So, the subpicture boundaries need to be derived correctly above, even if subpictures are not used.

Change history (2)

comment:1 Changed 5 weeks ago by yk

Thanks! I agree. And since the equation is located in the SH semantics (it was originally located in the SPS semantics), in any case it is safe to use the actual picture size from the PPS.

comment:2 Changed 3 weeks ago by bbross

  • Resolution set to fixed
  • Status changed from new to closed

Fixed as discussed/suggested in JVET-T0110-v2.

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