Opened 14 years ago

Closed 13 years ago

#181 closed defect (fixed)

Improper motion information subsampling

Reported by: fbossen Owned by:
Priority: minor Milestone:
Component: HM Version: HM-3.0
Keywords: Cc: fbossen, ksuehring, davidf, jct-vc@…

Description

In TComCUMvField::compress subsampling of motion information is done using a constant factor AMVP_DECIMATION_FACTOR. When the smallest CU size is other than 8x8 (and smallest PU size other than 4x4) this leads to a subsampling that may be more substantial than intended. For example if the smallest CU size is 16x16, motion vectors would be kept at 32x32 resolution. Additionally if the maximum CU depth is 1 this leads to memory corruption as it is not possible to subsample by a factor of 4 (default value of AMVP_DECIMATION_FACTOR) without crossing LCU boundaries.

Change History (5)

comment:1 Changed 14 years ago by fbossen

  • Version set to HM-3.0

comment:2 Changed 13 years ago by fbossen

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

Fixed in r995

comment:3 Changed 13 years ago by davidf

  • Component set to HM

Updating component after adding WD (Text) tickets

comment:4 Changed 13 years ago by davidf

  • Cc fbossen ksuehring davidf added

comment:5 Changed 13 years ago by davidf

  • Cc jct-vc@… added
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  • David Flynn(Subscriber, Participant)
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  • Karsten Suehring(Subscriber, Always)