Opened 4 years ago
Closed 4 years ago
#757 closed defect (fixed)
LmcsPivot constraint issue
| Reported by: | wzeng | Owned by: | |
|---|---|---|---|
| Priority: | minor | Milestone: | |
| Component: | spec | Version: | VVC D7 vE |
| Keywords: | Cc: | ksuehring, bbross, XiangLi, fbossen, jvet@… |
Description
In VVC D7 vE, a constraint of LmcsPivot is introduced as below:
It is a requirement of bitstream conformance that, for i = lmcs_min_bin_idx..LmcsMaxBinIdx, when the value of LmcsPivot[ i ] is not a multiple of 32, the value of ( LmcsPivot[ i ] >> ( BitDepth − 5 ) ) shall not be equal to the value of ( LmcsPivot[ i + 1 ] >> ( BitDepth − 5 ) ).
Since the number of segments is fixed, the value "32" should be BitDepth dependent. It should be replaced by "1<<(BitDepth-5)".
Change history (3)
comment:1 Changed 4 years ago by peterchuang
comment:2 Changed 4 years ago by abe.kiyo
You are correct. I have confirmed that VTM has been implemented like as your pointing out.
comment:3 Changed 4 years ago by bbross
- Resolution set to fixed
- Status changed from new to closed
Thanks for reporting.
This has been fixed in JVET-Q2001-v8.
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As the proponent of this constraint, we confirmed that the "32" should be modified to "1<<(BitDepth-5)".