Patent ID: 11895316
Assignee: PANASONIC INTELLECTUAL PROPERTY CORPORATION OF AMERICA
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A decoder comprising:
a processor; and
memory, wherein using the memory, the processor:
derives a representative motion vector indicating a representative position from a bitstream;
determines, in a first reference picture for a current block, a first motion estimation region that includes the representative position indicated by the representative motion vector;
calculates first evaluation values of a plurality of candidate regions included in the first motion estimation region, each of the first evaluation values being a difference between (i) a corresponding candidate region from among the plurality of candidate regions and (ii) a region in a second reference picture;
determines a first adjacent region included in the first motion estimation region, the first adjacent region including a first candidate region and a vicinity of the first candidate region, the first candidate region being one of the plurality of the candidate regions having a smallest first evaluation value among the plurality of candidate regions included in the first motion estimation region; and
determines a motion vector of the current block using a smallest second evaluation value among a plurality of regions included in the first adjacent region,

wherein a first picture order count between a current picture including the current block and the first reference picture and a second picture order count between the current picture and the second reference picture is the same.