Opened 4 months ago
Last modified 4 weeks ago
#344 new defect
spatial merge candidate derivation process with wrong prunings
Reported by: | LiZhang | Owned by: | |
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Priority: | minor | Milestone: | |
Component: | spec | Version: | VVC D6 vE |
Keywords: | Cc: | ksuehring, bbross, XiangLi, fbossen, jvet@… |
Description
The pruning process is dependent on the enabling of triangular prediction mode which is not aligned with the SW.
8.5.2.3 Derivation process for spatial merging candidates
…
For the derivation of availableFlagB0, refIdxLXB0, predFlagLXB0 and mvLXB0 the following applies:
– …
– The variables availableFlagB0, refIdxLXB0, predFlagLXB0 and mvLXB0 are derived as follows:
– If one or more of the following conditions are true, availableFlagB0 is set equal to 0, both components of mvLXB0 are set equal to 0, refIdxLXB0 is set equal to −1 and predFlagLXB0 is set equal to 0, with X being 0 or 1, and bcwIdxB0 is set equal to 0:
– availableB0 is equal to FALSE.
– availableB1 is equal to TRUE and the luma locations ( xNbB1, yNbB1 ) and ( xNbB0, yNbB0 ) have the same motion vectors and the same reference indices.
– availableA1 is equal to TRUE, the luma locations ( xNbA1, yNbA1 ) and ( xNbB0, yNbB0 ) have the same motion vectors and the same reference indices and MergeTriangleFlag[ xCb ][ yCb ] is equal to 1.
– Otherwise, availableFlagB0 is set equal to 1 and the following assignments are made:
…
For the derivation of availableFlagA0, refIdxLXA0, predFlagLXA0 and mvLXA0 the following applies:
– …
– The variables availableFlagA0, refIdxLXA0, predFlagLXA0 and mvLXA0 are derived as follows:
– If one or more of the following conditions are true, availableFlagA0 is set equal to 0, both components of mvLXA0 are set equal to 0, refIdxLXA0 is set equal to −1 and predFlagLXA0 is set equal to 0, with X being 0 or 1, and bcwIdxA0 is set equal to 0:
– availableA0 is equal to FALSE.
– availableA1 is equal to TRUE and the luma locations ( xNbA1, yNbA1 ) and ( xNbA0, yNbA0 ) have the same motion vectors and the same reference indices.
– availableB1 is equal to TRUE, the luma locations ( xNbB1, yNbB1 ) and ( xNbA0, yNbA0 ) have the same motion vectors and the same reference indices and MergeTriangleFlag[ xCb ][ yCb ] is equal to 1.
– availableB0 is equal to TRUE, the luma locations ( xNbB0, yNbB0 ) and ( xNbA0, yNbA0 ) have the same motion vectors and the same reference indices and MergeTriangleFlag[ xCb ][ yCb ] is equal to 1.
– Otherwise, availableFlagA0 is set equal to 1 and the following assignments are made:
…
For the derivation of availableFlagB2, refIdxLXB2, predFlagLXB2 and mvLXB2 the following applies:
– …
– The variables availableFlagB2, refIdxLXB2, predFlagLXB2 and mvLXB2 are derived as follows:
– If one or more of the following conditions are true, availableFlagB2 is set equal to 0, both components of mvLXB2 are set equal to 0, refIdxLXB2 is set equal to −1 and predFlagLXB2 is set equal to 0, with X being 0 or 1, and bcwIdxB2 is set equal to 0:
– availableB2 is equal to FALSE.
– availableA1 is equal to TRUE and the luma locations ( xNbA1, yNbA1 ) and ( xNbB2, yNbB2 ) have the same motion vectors and the same reference indices.
– availableB1 is equal to TRUE and the luma locations ( xNbB1, yNbB1 ) and ( xNbB2, yNbB2 ) have the same motion vectors and the same reference indices.
– availableB0 is equal to TRUE, the luma locations ( xNbB0, yNbB0 ) and ( xNbB2, yNbB2 ) have the same motion vectors and the same reference indices and MergeTriangleFlag[ xCb ][ yCb ] is equal to 1.
– availableA0 is equal to TRUE, the luma locations ( xNbA0, yNbA0 ) and ( xNbB2, yNbB2 ) have the same motion vectors and the same reference indices and MergeTriangleFlag[ xCb ][ yCb ] is equal to 1.
– availableFlagA0 + availableFlagA1 + availableFlagB0 + availableFlagB1 is equal to 4 and MergeTriangleFlag[ xCb ][ yCb ] is equal to 0.
– Otherwise, availableFlagB2 is set equal to 1 and the following assignments are made:
…
Change history (6)
comment:1 Changed 4 months ago by bbross
- Version changed from VVC D5 v9 to VVC D5 v10
comment:2 Changed 3 months ago by bbross
comment:3 Changed 3 months ago by bbross
- Version changed from VVC D5 v10 to VVC D6 vD
comment:4 Changed 3 months ago by bbross
I would fix it by aligning the spec to VTM if no one objects.
comment:5 Changed 3 months ago by bbross
- Version changed from VVC D6 vD to VVC D6 vE
comment:6 Changed 4 weeks ago by bbross
Ticket #547 has been marked as a duplicate of this ticket.
Does that issue still exists in VTM-6.0 and D6?
If so should the draft be modified to match VTM or vice-versa?