US 12,439,076 B2
Selective subblock-based motion refinement
Ruoyang Yu, Täby (SE); Kenneth Andersson, Gävle (SE); and Jacob Ström, Stockholm (SE)
Assigned to TELEFONAKTIEBOLAGET LM ERICSSON (PUBL), Stockholm (SE)
Appl. No. 18/575,262
Filed by Telefonaktiebolaget LM Ericsson (publ), Stockholm (SE)
PCT Filed Jun. 2, 2022, PCT No. PCT/SE2022/050531
§ 371(c)(1), (2) Date Dec. 28, 2023,
PCT Pub. No. WO2023/277755, PCT Pub. Date Jan. 5, 2023.
Claims priority of provisional application 63/216,729, filed on Jun. 30, 2021.
Prior Publication US 2024/0333968 A1, Oct. 3, 2024
Int. Cl. H04N 19/132 (2014.01); H04N 19/139 (2014.01); H04N 19/176 (2014.01); H04N 19/513 (2014.01)
CPC H04N 19/521 (2014.11) [H04N 19/132 (2014.11); H04N 19/139 (2014.11); H04N 19/176 (2014.11)] 20 Claims
OG exemplary drawing
 
1. A method of encoding a picture, the method comprising:
selecting a motion vector, MV, for a current block within the picture;
determining whether a condition is satisfied, wherein determining whether the condition is satisfied comprises: (i) determining if a subblock-based motion refinement is applicable for the current block and (ii) determining if a first subblock within the current block satisfies a criteria; and
as a result of determining that the condition is satisfied, not using the selected MV for encoding the current block,
wherein determining if the first subblock within the current block satisfies the criteria is performed as a result of determining that the subblock-based motion refinement is applicable for the current block and wherein determining if the first subblock within the current block satisfies the criteria comprises:
calculating a spatial activity value of the first subblock,
comparing the calculated spatial activity value to a spatial activity threshold, and
based on the comparison, determining whether the first subblock satisfies the criteria.