Opened 6 years ago
Closed 5 years ago
#165 closed defect (fixed)
Mismatch between Spec and software
Reported by: | adarsh | Owned by: | |
---|---|---|---|
Priority: | minor | Milestone: | |
Component: | spec | Version: | VVC D5 v5 |
Keywords: | Cc: | ksuehring, bbross, XiangLi, fbossen, jvet@… |
Description
CCLM checks luma reference samples only at the top and left of the current block; this was part of the software from the beginning; it did not check the top-left reference samples. The Spec currently seems to incorrectly refer to the top-left luma reference samples.
The related text Section 8.3.4.2.8 may be referred to using the tag "availTL."
Change history (10)
comment:1 Changed 6 years ago by bbross
- Version set to VVC D4 v2
comment:2 Changed 6 years ago by bbross
- Version changed from VVC D4 v2 to VVC D4 v3
comment:3 Changed 6 years ago by bbross
- Version changed from VVC D4 v3 to VVC D4 v4
comment:4 Changed 6 years ago by bbross
- Version changed from VVC D4 v4 to VVC D4 v6
comment:5 Changed 6 years ago by bbross
- Version changed from VVC D4 v6 to VVC D4 v7
comment:6 Changed 5 years ago by bbross
- Version changed from VVC D4 v7 to VVC D5 v4
comment:7 Changed 5 years ago by bbross
- Version changed from VVC D5 v4 to VVC D5 v5
comment:8 Changed 5 years ago by bbross
- Component changed from spec to VTM
- Version changed from VVC D5 v5 to VTM-5.0
comment:9 Changed 5 years ago by bbross
- Component changed from VTM to spec
- Version changed from VTM-5.0 to VVC D5 v5
After with Discussion with Karsten, I understand that tiles also inside a slice are independent.
Thus, TL is always n.a. when either L or T is n.a. and as long as we do nat have dependent tiles, the TL available check can be removed from the spec.
comment:10 Changed 5 years ago by bbross
- Resolution set to fixed
- Status changed from new to closed
Fixed in D5 v6
This check is actually needed and thats why I added it.
For the TL sample it is not sufficient to check L and T because with slices (formerly known as tile groups), the case can happen where TL is n.a. but T and L are available or vice versa.
See Figure 6-4 in the current draft where the first CTU in the 6th tile in raster-scan has T and L available but TL is n.a.
Hence, this condition should be added to VTM to cover these cases.