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US 12,713,057 B2Granted
Encoder, decoder, encoding method, and decoding method
AssigneePanasonic Intellectual Property Corporation of America
InventorsKiyofumi Abe, Takahiro Nishi, Tadamasa Toma, Ryuichi Kanoh, Takashi Hashimoto
Life of this patent
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Abstract
An encoder includes circuitry and memory. Using the memory, the circuitry, in inter prediction processing: derives a first motion vector of a current block to be processed, using a motion vector of a previous block which has been previously processed; derives a second motion vector of the current block by performing motion estimation in the vicinity of the first motion vector; and generates a prediction image of the current block by performing motion compensation using the second motion vector.
Claims5
A decoder, comprising:
- circuitry;
- and
- memory, wherein
- using the memory, the circuitry, in inter prediction processing:
- derives a first motion vector of a first current block to be processed, using a motion vector of a previous block which has been previously processed;
- derives a second motion vector of the first current block by performing a motion estimation in vicinity of a position specified by the first motion vector, the motion estimation including searching a position with an evaluation value lowest in vicinity of the position specified by the first motion vector;
- generates a prediction image of the first current block by performing motion compensation using the second motion vector;
- derives a third motion vector of a second current block to be processed after the first current block, using the first motion vector of the first current block, when the second current block is included in a first picture including the first current block;
- derives a third motion vector of the second current block, using the second motion vector of the first current block, when the second current block is included in a second picture different from the first picture;
- derives a fourth motion vector of the second current block by performing motion estimation in vicinity of a position specified by the third motion vector;
- and
- generates a prediction image of the second current block by performing motion compensation using the fourth motion vector.
9 more elements
An encoder, comprising:
- circuitry;
- and
- memory, wherein
- using the memory, the circuitry, in inter prediction processing:
- derives a first motion vector of a first current block to be processed, using a motion vector of a previous block which has been previously processed;
- derives a second motion vector of the first current block by performing motion estimation in vicinity of a position specified by the first motion vector, the motion estimation including searching a position with an evaluation value lowest in vicinity of the position specified by the first motion vector;
- generates a prediction image of the first current block by performing motion compensation using the second motion vector;
- derives a third motion vector of a second current block to be processed after the first current block, using the first motion vector of the first current block, when the second current block is included in a first picture including the first current block;
- derives a third motion vector of the second current block, using the second motion vector of the first current block, when the second current block is included in a second picture different from the first picture;
- derives a fourth motion vector of the second current block by performing motion estimation in vicinity of a position specified by the third motion vector;
- and
- generates a prediction image of the second current block by performing motion compensation using the fourth motion vector.
9 more elements
A decoding method, comprising:
- deriving a first motion vector of a first current block to be processed, using a motion vector of a previous block which has been previously processed;
- deriving a second motion vector of the first current block by performing motion estimation in vicinity of a position specified by the first motion vector, the motion estimation including searching a position with an evaluation value lowest in vicinity of the position specified by the first motion vector;
- generating a prediction image of the first current block by performing motion compensation using the second motion vector;
- deriving a third motion vector of a second current block to be processed after the first current block, using the first motion vector of the first current block, when the second current block is included in a first picture including the first current block;
- deriving a third motion vector of the second current block, using the second motion vector of the first current block, when the second current block is included in a second picture different from the first picture;
- deriving a fourth motion vector of the second current block by performing motion estimation in vicinity of a position specified by the third motion vector;
- and
- generating a prediction image of the second current block by performing motion compensation using the fourth motion vector.
5 more elements
An encoding method, comprising:
- deriving a first motion vector of a first current block to be processed, using a motion vector of a previous block which has been previously processed;
- deriving a second motion vector of the first current block by performing motion estimation in vicinity of a position specified by the first motion vector, the motion estimation including searching a position with an evaluation value lowest in vicinity of the position specified by the first motion vector;
- generating a prediction image of the first current block by performing motion compensation using the second motion vector;
- deriving a third motion vector of a second current block to be processed after the first current block, using the first motion vector of the first current block, when the second current block is included in a first picture including the first current block;
- deriving a third motion vector of the second current block, using the second motion vector of the first current block, when the second current block is included in a second picture different from the first picture;
- deriving a fourth motion vector of the second current block by performing motion estimation in vicinity of a position specified by the third motion vector;
- and
- generating a prediction image of the second current block by performing motion compensation using the fourth motion vector.
5 more elements
Dependencies are inferred from the claim text.