Moving-picture coding device, moving-picture coding method, moving-picture coding program, moving-picture decoding device, moving-picture decoding method, and moving-picture decoding program

A moving-picture coding method of performing an affine transform in units of coding blocks, the moving-picture coding method comprising:

• an affine inheritance merging candidate derivation step of deriving an affine inheritance merging candidate for inheriting an affine model of blocks neighboring a coding target block in a space domain;
• an affine construction merging candidate derivation step of deriving an affine construction merging candidate from a plurality of motion information elements of blocks neighboring the coding target block in a space or time domain;
• and
• an affine fixation merging candidate derivation step of deriving an affine fixation merging candidate in which motion information of an affine control point is fixed,
• wherein a motion vector of each affine control point is fixed to (0, 0) in the affine fixation merging candidate.

A moving-picture coding program for performing an affine transform in units of coding blocks stored in a computer-readable non-transitory recording medium, the moving-picture coding program causing a computer to execute:

• an affine inheritance merging candidate derivation step of deriving an affine inheritance merging candidate for inheriting an affine model of blocks neighboring a coding target block in a space domain;
• an affine construction merging candidate derivation step of deriving an affine construction merging candidate from a plurality of motion information elements of blocks neighboring the coding target block in a space or time domain;
• and
• an affine fixation merging candidate derivation step of deriving an affine fixation merging candidate in which motion information of an affine control point is fixed,
• wherein a motion vector of each affine control point is fixed to (0, 0) in the affine fixation merging candidate.

A moving-picture decoding device for performing an affine transform in units of decoding blocks, the moving-picture decoding device comprising:

• an affine inheritance merging candidate derivation unit configured to derive an affine inheritance merging candidate for inheriting an affine model of blocks neighboring a decoding target block in a space domain;
• an affine construction merging candidate derivation unit configured to derive an affine construction merging candidate from a plurality of motion information elements of blocks neighboring the decoding target block in a space or time domain;
• and
• an affine fixation merging candidate derivation unit configured to derive an affine fixation merging candidate in which motion information of an affine control point is fixed,
• wherein a motion vector of each affine control point is fixed to (0, 0) in the affine fixation merging candidate.

A moving-picture decoding method of performing an affine transform in units of decoding blocks, the moving-picture decoding method comprising:

• an affine inheritance merging candidate derivation step of deriving an affine inheritance merging candidate for inheriting an affine model of blocks neighboring a decoding target block in a space domain;
• an affine construction merging candidate derivation step of deriving an affine construction merging candidate from a plurality of motion information elements of blocks neighboring the decoding target block in a space or time domain;
• and
• an affine fixation merging candidate derivation step of deriving an affine fixation merging candidate in which motion information of an affine control point is fixed,
• wherein a motion vector of each affine control point is fixed to (0, 0) in the affine fixation merging candidate.

A moving-picture decoding program for performing an affine transform in units of decoding blocks stored in a computer-readable non-transitory recording medium, the moving-picture decoding program causing a computer to execute:

• an affine inheritance merging candidate derivation step of deriving an affine inheritance merging candidate for inheriting an affine model of blocks neighboring a decoding target block in a space domain;
• an affine construction merging candidate derivation step of deriving an affine construction merging candidate from a plurality of motion information elements of blocks neighboring the decoding target block in a space or time domain;
• and
• an affine fixation merging candidate derivation step of deriving an affine fixation merging candidate in which motion information of an affine control point is fixed,
• wherein a motion vector of each affine control point is fixed to (0, 0) in the affine fixation merging candidate.