Image decoding device, image decoding method, and program

An image decoding method comprising:

• specifying a merge candidate in a merge list of a normal merge mode for adding a direction, a distance, and an MVD in a merge with motion vector difference, based on syntax transmitted from an image encoding device;
• and
• adding the MVD to an MV indicated by the specified merge candidate to refine the MV, wherein
• a merge candidate in a merge list of the normal merge mode is generated and stored by a spatial merge candidate, a temporal merge candidate, a non-adjacent merge candidate, a history merge candidate, a pairwise merge candidate, or a zero merge candidate, and
• in the specifying, the merge candidate is specified from zeroth to fourth merge candidates in the merge list based on syntax transmitted from the image encoding device.

A program stored on a non-transitory computer-readable medium causing a computer to function as an image decoding device,

• the image decoding device comprising a circuit, wherein
• the circuit:
• specifies a merge candidate in a merge list of a normal merge mode for adding a direction, a distance, and an MVD in a merge with motion vector difference, based on syntax transmitted from an image encoding device;
• and
• adds the MVD to an MV indicated by the specified merge candidate to refine the MV, wherein
• a merge candidate in a merge list of the normal merge mode is generated and stored by a spatial merge candidate, a temporal merge candidate, a non-adjacent merge candidate, a history merge candidate, a pairwise merge candidate, or a zero merge candidate, and
• the circuit specifies the merge candidate from zeroth to fourth merge candidates in the merge list based on syntax transmitted from the image encoding device.