Opened 4 years ago
Closed 4 years ago
#707 closed enhancement (fixed)
Mismatch on context index derivation of transform_skip_flag and mts_idx between WD and SW
| Reported by: | tsukuba.takeshi | Owned by: | |
|---|---|---|---|
| Priority: | minor | Milestone: | VTM-7.1 |
| Component: | VTM | Version: | VTM-7.0 |
| Keywords: | Cc: | ksuehring, XiangLi, fbossen, jvet@… |
Description
According to JVET-P2001vD,context index derivation of transform_skip_flag and mts_idx are defined as below:
| binIdx | ||||||
|---|---|---|---|---|---|---|
| syntax element | 0 | 1 | 2 | 3 | 4 | >=5 |
| transform_skip_flag[][][cIdx] | cIdx==0 ? 0:1 | na | na | na | na | na |
| mts_idx | 0 | 1 | 2 | 3 | na | na |
However, in VTM-7.0, context index derivation of transform_skip_flag and mts_idx are defined as below:
| binIdx | ||||||
|---|---|---|---|---|---|---|
| syntax element | 0 | 1 | 2 | 3 | 4 | >=5 |
| transform_skip_flag[][][cIdx] | cIdx==0 ? 6:11 | na | na | na | na | na |
| mts_idx | 0 | 7 | 8 | 9 | na | na |
In addition, unused context indexes (ctxInc = 1 to 5) exist, which should be removed.
Context index derivation in SW should be aligned with WD.
Change history (4)
comment:1 Changed 4 years ago by tsukuba.takeshi
comment:2 Changed 4 years ago by tsukuba.takeshi
comment:3 Changed 4 years ago by Jamaika
Sorry. Something is wrong. B-frames are blurred but compile faster.
comment:4 Changed 4 years ago by fbossen
- Resolution set to fixed
- Status changed from new to closed
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Sorry. Following is right description.
According to JVET-P2001vD,context index derivation of transform_skip_flag and mts_idx are defined as below:
However, in VTM-7.0, context index derivation of transform_skip_flag and mts_idx are defined as below:
In addition, unused context indexes (ctxInc = 1 to 5) exist, which should be removed.
Context index derivation in SW should be aligned with WD.