Three-dimensional data encoding method, three-dimensional data decoding method, three-dimensional data encoding device, and three-dimensional data decoding device

A three-dimensional data encoding device, comprising:

• a processor;
• and
• memory, wherein
• the processor uses the memory to:
• generate predicted position information using position information on three-dimensional points included in three-dimensional reference data associated with a time different from a time associated with current three-dimensional data;
• and
• encode position information on three-dimensional points included in the current three-dimensional data, using the predicted position information.

A three-dimensional data decoding device, comprising:

• a processor;
• and
• memory, wherein
• the processor uses the memory to:
• generate predicted position information using position information on three-dimensional points included in three-dimensional reference data associated with a time different from a time associated with current three-dimensional data;
• and
• restore position information on three-dimensional points included in the current three-dimensional data, by decoding encoded position information included in an encoded signal, using the predicted position information.