3D data coding apparatus and 3D data decoding apparatus

A three-dimensional (3D) data decoding apparatus for decoding coded data, including an occupancy, a geometry, and an attribute, converted from 3D data, the 3D data decoding apparatus comprising:

• a refinement information decoder configured to decode characteristics information of refinement and activation information of refinement from the coded data;
• an occupancy decoder configured to decode an occupancy frame from the coded data;
• a geometry decoder configured to decode a geometry frame from the coded data;
• an attribute decoder configured to decode an attribute frame from the coded data;
• and
• a refiner configured to perform refinement processing of the attribute frame or the geometry frame, wherein:
• the refinement information decoder is further configured to decode refinement information indicating whether each of the occupancy, the geometry, and the attribute is to be used from coded data of the characteristics information for an input tensor, and
• the refiner is configured to perform the refinement processing using images selected from the occupancy frame, the geometry frame, or the attribute frame, wherein the images are specified according to the refinement information.