Encoder, decoder, encoding method, and decoding method
AssigneePanasonic Intellectual Property Corporation of America
InventorsKiyofumi Abe, Takahiro Nishi, Tadamasa Toma
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Abstract
An encoder includes circuitry and memory. Using the memory, the circuitry performs prediction on an image. A motion vector predictor list used in the prediction includes a spatially neighboring motion vector predictor obtained from a block spatially neighboring a current block, and a spatially broad motion vector predictor obtained from a block positioned at any of a plurality of predetermined positions in a second range that is broader than a first range that spatially neighbors the current block. The plurality of predetermined positions are defined by a regular interval using the top-left of a current picture as a reference point.
Claims4
An encoder that encodes a video, the encoder comprising:
- circuitry;
- and
- memory,
- wherein, using the memory, the circuitry:
- generates a motion vector predictor list by registering motion vectors obtained by referencing a plurality of encoded blocks, selects one motion vector predictor from the motion vector predictor list, and implements a prediction mode that performs motion compensation on a current block using a motion vector derived from the one motion vector predictor,
- the motion vector predictor list includes (i) a first motion vector predictor obtained from a block in a first range that spatially neighbors the current block, and (ii) a second motion vector predictor obtained from a block positioned at any of a plurality of predetermined positions in a second range that is broader than the first range,
- information on motion vectors to be referenced in the prediction mode is managed in association with reference blocks of a specific size, and
- the plurality of predetermined positions are positions of reference blocks in positions defined by a regular interval using a current picture including the current block as a reference.
A decoder that decodes a video, the decoder comprising:
- circuitry;
- and
- memory,
- wherein, using the memory, the circuitry:
- generates a motion vector predictor list by registering motion vectors obtained by referencing a plurality of decoded blocks, selects one motion vector predictor from the motion vector predictor list, and implements a prediction mode that performs motion compensation on a current block using a motion vector derived from the one motion vector predictor,
- the motion vector predictor list includes (i) a first motion vector predictor obtained from a block in a first range that spatially neighbors the current block, and (ii) a second motion vector predictor obtained from a block positioned at any of a plurality of predetermined positions in a second range that is broader than the first range,
- information on motion vectors to be referenced in the prediction mode is managed in association with reference blocks of a specific size, and
- the plurality of predetermined positions are positions of reference blocks in positions defined by a regular interval using a current picture including the current block as a reference point.
An encoding method of encoding a video, the encoding method comprising:
- generating a motion vector predictor list by registering motion vectors obtained by referencing a plurality of encoded blocks, selects one motion vector predictor from the motion vector predictor list, and implements a prediction mode that performs motion compensation on a current block using a motion vector derived from the one motion vector predictor,
- wherein the motion vector predictor list includes (i) a first motion vector predictor obtained from a block in a first range that spatially neighbors the current block, and (ii) a second motion vector predictor obtained from a block positioned at any of a plurality of predetermined positions in a second range that is broader than the first range, and
- the plurality of predetermined positions are defined by a regular interval using a current picture including the current block as a reference point.
A decoding method of decoding a video, the decoding method comprising:
- generating a motion vector predictor list by registering motion vectors obtained by referencing a plurality of decoded blocks, selects one motion vector predictor from the motion vector predictor list, and implements a prediction mode that performs motion compensation on a current block using a motion vector derived from the one motion vector predictor,
- wherein the motion vector predictor list includes (i) a first motion vector predictor obtained from a block in a first range that spatially neighbors the current block, and (ii) a second motion vector predictor obtained from a block positioned at any of a plurality of predetermined positions in a second range that is broader than the first range, and
- the plurality of predetermined positions are defined by a regular interval using a current picture including the current block as a reference point.
Dependencies are inferred from the claim text.