Patent ID: 11889105
Assignee: PANASONIC INTELLECTUAL PROPERTY CORPORATION OF AMERICA
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H | IPC H

Claim 1:
2. A decoder, comprising:
circuitry; and
memory, wherein
using the memory, the circuitry, in operation, determines to perform a decoding mode based on decoding-mode information from among candidates including a decoder-side motion vector refinement (DMVR) decoding mode and a partition decoding mode, the decoding-mode information including a flag relating to a non-rectangular shape,
when the DMVR decoding mode is determined to be performed, the circuitry:
obtains a first image block from a first coding tree unit (CTU);
obtains a first motion vector for the first image block;
derives a second motion vector from the first motion vector using motion search; and
generates a prediction image for the first image block using the second motion vector; and

when the partition decoding mode is determined to be performed, the circuitry:
obtains a second image block from a second coding tree unit (CTU);
determines a plurality of non-rectangular partitions in the second image block;
obtains a third motion vector for each non-rectangular partition; and
generates a prediction image for the second image block using the third motion vector, without deriving a fourth motion vector from the third motion vector using motion search.