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 using a first encoding scheme and a second encoding scheme different from the first encoding scheme, the device comprising:

• a processor;
• and
• memory,
• wherein using the memory, the processor:
• performs transformation, the transformation being one of (i) transforming a first quantization parameter to a first scale value and (ii) transforming the first scale value to the first quantization parameter, based on a first table indicating a correspondence between a plurality of values of the first quantization parameter and a plurality of values of the first scale value, the first table being shared between the first encoding scheme and the second encoding scheme;
• performs encoding including a first quantization process to generate encoded attribute information, the first quantization process being a process of dividing, by the first scale value, each of first coefficient values based on items of attribute information of three-dimensional points included in point cloud data;
• and
• generates a bitstream including the encoded attribute information and the first quantization parameter.

A three-dimensional data decoding device using a first decoding scheme and a second decoding scheme different from the first decoding scheme, the device comprising:

• a processor;
• and
• memory,
• wherein using the memory, the processor:
• obtains encoded attribute information and a first quantization parameter from a bitstream, the encoded attribute information being generated by encoding items of attribute information of three-dimensional points included in point cloud data;
• transforms the first quantization parameter to a first scale value, based on a first table indicating a correspondence between a plurality of values of the first quantization parameter and a plurality of values of the first scale value, the first table being shared between the first decoding scheme and the second decoding scheme;
• performs decoding including a first inverse quantization process to decode the items of attribute information, the first inverse quantization process being a process of multiplying, by the first scale value, each of first quantization coefficients based on the encoded attribute information.