Encoder, decoder, encoding method, and decoding method
AssigneePanasonic Intellectual Property Corporation of America
InventorsKiyofumi Abe, Takahiro Nishi, Tadamasa Toma, Ryuichi Kanoh
Life of this patent
Estimating the term…
Abstract
An encoder includes memory and circuitry. The circuitry: derives a first motion vector in a unit of a prediction block using a first inter frame prediction mode that uses a degree of matching between two reconstructed images of two regions in two difference pictures, the prediction block being obtained by splitting an image included in a video; and performs, in the unit of the prediction block, a first motion compensation process that generates a prediction image by referring to a spatial gradient of luminance in an image generated by performing motion compensation using the first motion vector derived.
Claims4
An encoder, comprising:
- circuitry;
- and
- memory,
- wherein, using the memory, the circuitry performs a first process by:
- deriving a first motion vector of a first prediction block;
- and
- generating a prediction image of the first prediction block by referring to a spatial gradient of luminance generated by performing motion compensation using the first motion vector derived,
- wherein the first motion vector is not encoded in a bitstream and the first motion vector is not modified per sub-block, the sub-block being obtained by splitting the first prediction block,
- a second process, which is the same as the first process, is performed in a decoder to derive the first motion vector, and
- in the first process, evaluation values are calculated for each candidate for the first motion vector, and a motion vector having a better evaluation value than other evaluation values is determined as the first motion vector, each of the evaluation values corresponding to a degree of matching between two regions in two reconstructed images.
An encoding method, comprising:
- performing a first process by:
- deriving a first motion vector of a first prediction block;
- and
- generating a prediction image of the first prediction block by referring to a spatial gradient of luminance generated by performing motion compensation using the first motion vector derived,
- wherein the first motion vector is not encoded in a bitstream and the first motion vector is not modified per sub-block, the sub-block being obtained by splitting the first prediction block,
- a second process, which is the same as the first process, is performed in a decoder to derive the first motion vector, and
- in the first process, evaluation values are calculated for each candidate for the first motion vector, and a motion vector having a better evaluation value than other evaluation values is determined as the first motion vector, each of the evaluation values corresponding to a degree of matching between two regions in two reconstructed images.
Dependencies are inferred from the claim text.