Opened 5 years ago
Closed 3 years ago
#342 closed defect (invalid)
CTU boundary position not computed correctly for Chroma deblocking
| Reported by: | AnandMeher | Owned by: | |
|---|---|---|---|
| Priority: | minor | Milestone: | |
| Component: | VTM | Version: | VTM-5.0 |
| Keywords: | Longer tap deblocking for Chroma | Cc: | ksuehring, XiangLi, fbossen, jvet@… |
Description
For the Chroma longer tap deblocking, longer tap filter is currently switched off at the horizontal CTU boundaries to reduce line buffer.
In the VTM-5.0 code, in function xEdgeFilterChroma, the position for the horizontal CTU boundary seems to be computed incorrectly, which is as follows:
pos.y % cuP.slice->getSPS()->getCTUSize() == 0
which does not take into account the Chroma re-scaling based on the Chroma format.
A possible fix could be as follows:
(pos.y % (cuP.slice->getSPS()->getCTUSize() >> ::getComponentScaleX(COMPONENT_Cb, nChromaFormat)) == 0)
Change history (2)
comment:1 Changed 5 years ago by AnandMeher
comment:2 Changed 3 years ago by fbossen
- Resolution set to invalid
- Status changed from new to closed
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After further investigation, it seems the implementation of VTM-5.0 is correct as "pos.y" variable is already re-scaled. Therefore this ticket can be closed.