Encoding device, decoding device, encoding method, and decoding method

A decoding device comprising:

• circuitry;
• and
• memory coupled to the circuitry, wherein
• in operation, the circuitry:
• obtains a bitstream;
• and
• decodes, from the bitstream, a first three-dimensional data generative model corresponding to a first time and a second three-dimensional data generative model corresponding to a second time, and
• when receiving viewpoint information including a viewpoint and a line-of-sight direction, each of the first three-dimensional data generative model and the second three-dimensional data generative model outputs a two-dimensional image of a subject as viewed from the viewpoint and the line-of-sight direction.

An encoding method comprising:

• obtaining a first three-dimensional data generative model corresponding to a first time and a second three-dimensional data generative model corresponding to a second time;
• and
• generating a bitstream by encoding the first three-dimensional data generative model obtained and the second three-dimensional data generative model obtained, wherein
• when receiving viewpoint information including a viewpoint and a line-of-sight direction, each of the first three-dimensional data generative model and the second three-dimensional data generative model outputs a two-dimensional image of a subject as viewed from the viewpoint and the line-of-sight direction.

A decoding method comprising:

• obtaining a bitstream;
• and
• decoding, from the bitstream, a first three-dimensional data generative model corresponding to a first time and a second three-dimensional data generative model corresponding to a second time, wherein
• when receiving viewpoint information including a viewpoint and a line-of-sight direction, each of the first three-dimensional data generative model and the second three-dimensional data generative model outputs a two-dimensional image of a subject as viewed from the viewpoint and the line-of-sight direction.