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

Abstract

A three-dimensional data encoding method includes: combining first point cloud data and second point cloud data to generate third point cloud data; and encoding the third point cloud data to generate encoded data. The encoded data includes identification information indicating whether each of three-dimensional points included in the third point cloud data belongs to the first point cloud data or the second point cloud data.

What is claimed is: 
     
         1 . A three-dimensional data encoding method, comprising:
 combining first point cloud data and second point cloud data to generate third point cloud data; and   encoding the third point cloud data to generate encoded data,   wherein the encoded data includes identification information indicating whether each of three-dimensional points included in the third point cloud data belongs to the first point cloud data or the second point cloud data.   
     
     
         2 . The three-dimensional data encoding method according to  claim 1 ,
 wherein the first point cloud data and the second point cloud data are point cloud data having different times.   
     
     
         3 . The three-dimensional data encoding method according to  claim 2 ,
 wherein the first point cloud data and the second point cloud data are point cloud data of a same object and having different times.   
     
     
         4 . The three-dimensional data encoding method according to  claim 1 ,
 wherein the encoded data includes geometry information and attribute information of each of the three-dimensional points included in the third point cloud data, and   the identification information is included in the attribute information.   
     
     
         5 . The three-dimensional data encoding method according to  claim 1 ,
 wherein the encoded data includes geometry information in which a position of each of the three-dimensional points included in the third point cloud data is expressed using an N-ary tree, N being an integer greater than or equal to 2.   
     
     
         6 . A three-dimensional data decoding method, comprising:
 decoding encoded data to obtain third point cloud data and identification information, the third point cloud data being generated by combining first point cloud data and second point cloud data, the identification information indicating whether each of three-dimensional points included in the third point cloud data belongs to the first point cloud data or the second point cloud data; and   separating the first point cloud data and the second point cloud data from the third point cloud data, using the identification information.   
     
     
         7 . The three-dimensional data decoding method according to  claim 6 ,
 wherein the first point cloud data and the second point cloud data are point cloud data having different times.   
     
     
         8 . The three-dimensional data decoding method according to  claim 7 ,
 wherein the first point cloud data and the second point cloud data are point cloud data of a same subject and having different times.   
     
     
         9 . The three-dimensional data decoding method according to  claim 6 ,
 wherein the encoded data includes geometry information and attribute information of each of the three-dimensional points included in the third point cloud data, and   the identification information is included in the attribute information.   
     
     
         10 . The three-dimensional data decoding method according to  claim 6 ,
 wherein the encoded data includes geometry information in which a position of each of the three-dimensional points included in the third point cloud data is expressed using an N-ary tree, N being an integer greater than or equal to 2.   
     
     
         11 . A three-dimensional data encoding device, comprising:
 a processor; and   memory,   wherein, using the memory, the processor:
 combines first point cloud data and second point cloud data to generate third point cloud data; and 
 encodes the third point cloud data to generate encoded data, 
   wherein the encoded data includes identification information indicating whether each of three-dimensional points included in the third point cloud data belongs to the first point cloud data or the second point cloud data.   
     
     
         12 . A three-dimensional data decoding device, comprising:
 a processor; and   memory,   wherein, using the memory, the processor:   decodes encoded data to obtain third point cloud data and identification information, the third point cloud data being generated by combining first point cloud data and second point cloud data, the identification information indicating whether each of three-dimensional points included in the third point cloud data belongs to the first point cloud data or the second point cloud data; and   separates the first point cloud data and the second point cloud data from the third point cloud data, using the identification information.