History-based motion vector prediction
Systems, methods, and instrumentalities are disclosed for processing history-based motion vector prediction (HMVP). A video coding device may generate a history-based motion vector prediction (HMVP) list for a current block. The video coding device derive an HMVP candidate from a previously coded block. The HMVP candidate may include motion information associated with a neighboring block of the current block, one or more reference indices, and a bi-prediction weight index. The video coding device may add the HMVP candidate to the HMVP list for motion compensated prediction of a motion vector associated with the current block. The video coding device use one HMVP selected from the HMVP list to perform motion compensated prediction of the current block. The motion compensated prediction may be performed using the motion information associated with the neighboring block of the current block, the one or more reference indices, and the bi-prediction weight index.
1. A device for video decoding, the device comprising:
a processor configured to:
generate a candidate list for performing motion compensated prediction associated with a current block, wherein the current block is partitioned into a triangular first partition and a second partition;
add at least one of a spatial candidate or a temporal candidate to the candidate list;
derive a history-based motion vector prediction (HMVP) candidate from a previously coded block;
add the HMVP candidate to the candidate list; and
decode the current block that comprises the triangular first partition and the second partition based on the candidate list.
2. The device of claim 1 , wherein the HMVP candidate is added to the candidate list after at least one of the spatial candidate or the temporal candidate.
3. The device of claim 1 , wherein the processor is further configured to:
interleave the HMVP candidate and at least one of the spatial candidate or the temporal candidate.
4. The device of claim 1 , wherein the processor is further configured to:
identify a first candidate from the candidate list and a second candidate from the candidate list, wherein:
the first candidate is associated with the triangular first partition and the second candidate is associated with the second partition, and
the current block is decoded based on the first candidate being associated with the triangular first partition and the second candidate being associated with the second partition.
5. The device of claim 1 , wherein the processor is further configured to:
identify a first candidate from the candidate list and a second candidate from the candidate list, wherein:
the first candidate is the HMVP candidate associated with the triangular first partition and the second candidate is the spatial candidate or the temporal candidate associated with the second partition, and
the current block is decoded based on the HMVP candidate being associated with the triangular first partition and the spatial candidate or the temporal candidate being associated with the second partition.
6. The device of claim 1 , wherein the processor is further configured to:
identify a merge index associated with the triangular first partition and the second partition; and
identify a first candidate from the candidate list and a second candidate from the candidate list based on the merge index, wherein:
the HMVP candidate is added to the candidate list after at least one of the spatial candidate or the temporal candidate,
the first candidate is the HMVP candidate associated with the triangular first partition and the second candidate is the spatial candidate or the temporal candidate associated with the second partition, and
the current block is decoded based on the HMVP candidate being associated with the triangular first partition and the spatial candidate or the temporal candidate being associated with the second partition.
7. The device of claim 1 , wherein the HMVP candidate comprises motion information and a reference index.
8. The device of claim 1 , wherein the second partition is partitioned at an angle and has different dimensions than the triangular first partition.
9. The device of claim 1 , wherein the candidate list is a uni-prediction motion vector candidate list.
10. The device of claim 1 , wherein the candidate list is a uni-prediction motion vector candidate list, the spatial candidate is a first spatial candidate, the temporal candidate is a first temporal candidate, the HMVP candidate is a first HMVP candidate, and the processor is further configured to:
determine at least one of the first spatial candidate or the first temporal candidate and the first HMVP candidate are associated with a first set of motion vectors;
determine at least one of a second spatial candidate or a second temporal candidate and a second HMVP candidate are associated with a second set of motion vectors;
add at least one of the first spatial candidate or the first temporal candidate to the uni-prediction motion vector candidate list;
add the first HMVP candidate to the uni-prediction motion vector candidate list;
add at least one of the second spatial candidate or the second temporal candidate to the uni-prediction motion vector candidate list; and
add the second HMVP candidate to the uni-prediction motion vector candidate list.
11. A method for video decoding, the method comprising:
generating a candidate list for performing motion compensated prediction associated with a current block, wherein the current block is partitioned into a triangular first partition and a second partition;
adding at least one of a spatial candidate or a temporal candidate to the candidate list;
deriving a history-based motion vector prediction (HMVP) candidate from a previously coded block;
adding the HMVP candidate to the candidate list; and
decoding the current block that comprises the triangular first partition and the second partition based on the candidate list.
12. The method of claim 11 , wherein the HMVP candidate is added to the candidate list after at least one of the spatial candidate or the temporal candidate.
13. The method of claim 11 , further comprising:
interleaving the HMVP candidate and at least one of the spatial candidate or the temporal candidate.
14. The method of claim 11 , further comprising:
identifying a first candidate from the candidate list and a second candidate from the candidate list, wherein:
the first candidate is associated with the triangular first partition and the second candidate is associated with the second partition, and
the current block is decoded based on the first candidate being associated with the triangular first partition and the second candidate being associated with the second partition.
15. The method of claim 11 , further comprising:
identifying a first candidate from the candidate list and a second candidate from the candidate list, wherein:
the first candidate is the HMVP candidate associated with the triangular first partition and the second candidate is the spatial candidate or the temporal candidate associated with the second partition, and
the current block is decoded based on the HMVP candidate being associated with the triangular first partition and the spatial candidate or the temporal candidate being associated with the second partition.
16. The method of claim 11 , further comprising:
identifying a merge index associated with the triangular first partition and the second partition; and
identifying a first candidate from the candidate list and a second candidate from the candidate list based on the merge index, wherein:
the HMVP candidate is added to the candidate list after at least one of the spatial candidate or the temporal candidate,
the first candidate is the HMVP candidate associated with the triangular first partition and the second candidate is the spatial candidate or the temporal candidate associated with the second partition, and
the current block is decoded based on the HMVP candidate being associated with the triangular first partition and the spatial candidate or the temporal candidate being associated with the second partition.
17. The method of claim 11 , wherein the HMVP candidate comprises motion information and a reference index.
18. The method of claim 11 , wherein the second partition is partitioned at an angle and has different dimensions than the triangular first partition.
19. The method of claim 11 , wherein the candidate list is a uni-prediction motion vector candidate list.
20. A device for video encoding, the device comprising:
a processor configured to:
generate a candidate list for performing motion compensated prediction associated with a current block, wherein the current block is partitioned into a triangular first partition and a second partition;
add at least one of a spatial candidate or a temporal candidate to the candidate list;
derive a history-based motion vector prediction (HMVP) candidate from a previously coded block;
add the HMVP candidate to the candidate list; and
encode the current block that comprises the triangular first partition and the second partition based on the candidate list.
21. The device of claim 20 , wherein the processor is further configured to:
identify a first candidate from the candidate list and a second candidate from the candidate list, wherein:
the first candidate is associated with the triangular first partition and the second candidate is associated with the second partition, and
the current block is encoded based on the first candidate being associated with the triangular first partition and the second candidate being associated with the second partition.
22. The device of claim 20 , wherein the processor is further configured to:
identify a first candidate from the candidate list and a second candidate from the candidate list, wherein:
the first candidate is the HMVP candidate associated with the triangular first partition and the second candidate is the spatial candidate or the temporal candidate associated with the second partition, and
the current block is encoded based on the HMVP candidate being associated with the triangular first partition and the spatial candidate or the temporal candidate being associated with the second partition.
23. The device of claim 20 , wherein the processor is further configured to:
identify a merge index associated with the triangular first partition and the second partition; and
identify a first candidate from the candidate list and a second candidate from the candidate list based on the merge index, wherein:
the HMVP candidate is added to the candidate list after at least one of the spatial candidate or the temporal candidate,
the first candidate is the HMVP candidate associated with the triangular first partition and the second candidate is the spatial candidate or the temporal candidate associated with the second partition, and
the current block is encoded based on the HMVP candidate being associated with the triangular first partition and the spatial candidate or the temporal candidate being associated with the second partition.
24. A method for video encoding, the method comprising:
generating a candidate list for performing motion compensated prediction associated with a current block, wherein the current block is partitioned into a triangular first partition and a second partition;
adding at least one of a spatial candidate or a temporal candidate to the candidate list;
deriving a history-based motion vector prediction (HMVP) candidate from a previously coded block;
adding the HMVP candidate to the candidate list; and
encoding the current block that comprises the triangular first partition and the second partition based on the candidate list.
25. The method of claim 24 , further comprising:
identifying a first candidate from the candidate list and a second candidate from the candidate list, wherein:
the first candidate is associated with the triangular first partition and the second candidate is associated with the second partition, and
the current block is encoded based on the first candidate being associated with the triangular first partition and the second candidate being associated with the second partition.
26. The method of claim 24 , further comprising:
identifying a first candidate from the candidate list and a second candidate from the candidate list, wherein:
the first candidate is the HMVP candidate associated with the triangular first partition and the second candidate is the spatial candidate or the temporal candidate associated with the second partition, and
the current block is encoded based on the HMVP candidate being associated with the triangular first partition and the spatial candidate or the temporal candidate being associated with the second partition.
27. The method of claim 24 , further comprising:
identifying a merge index associated with the triangular first partition and the second partition; and
identifying a first candidate from the candidate list and a second candidate from the candidate list based on the merge index, wherein:
the HMVP candidate is added to the candidate list after at least one of the spatial candidate or the temporal candidate,
the first candidate is the HMVP candidate associated with the triangular first partition and the second candidate is the spatial candidate or the temporal candidate associated with the second partition, and
the current block is encoded based on the HMVP candidate being associated with the triangular first partition and the spatial candidate or the temporal candidate being associated with the second partition.