Opened 5 years ago

Closed 4 years ago

#752 closed defect (fixed)

Incorrect constraint for sps_ref_wraparound_enabled_flag

Reported by: jiechen Owned by:
Priority: minor Milestone:
Component: spec Version: VVC D7 vE
Keywords: wrap around motion compensation Cc: ksuehring, bbross, XiangLi, fbossen, jvet@…

Description

In VVC draft7 vE,the semantics of sps_ref_wraparound_enabled_flag is as follows.

sps_ref_wraparound_enabled_flag equal to 1 specifies that horizontal wrap-around motion compensation is applied in inter prediction. sps_ref_wraparound_enabled_flag equal to 0 specifies that horizontal wrap-around motion compensation is not applied. When the value of ( CtbSizeY / MinCbSizeY + 1) is less than or equal to ( pic_width_in_luma_samples / MinCbSizeY − 1 ), where pic_width_in_luma_samples is the value of pic_width_in_luma_samples in any PPS that refers to the SPS, the value of sps_ref_wraparound_enabled_flag shall be equal to 0.

Here "the value of ( CtbSizeY / MinCbSizeY + 1) is less than or equal to ( pic_width_in_luma_samples / MinCbSizeY − 1 )" should be "the value of ( CtbSizeY / MinCbSizeY + 1) is larger than ( pic_width_in_luma_samples / MinCbSizeY − 1 )", since wrap around MC can only be enabled when ( CtbSizeY / MinCbSizeY ) + 1 <= ( pic_width_in_luma_samples / MinCbSizeY ) − 1

Change history (1)

comment:1 Changed 4 years ago by yk

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

Thanks! Will be fixed in JVET-Q2001-vA.

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