Point cloud data encoding method, point cloud data decoding method, point cloud data processing method, apparatuses, electronic device, computer program product, and computer-readable storage medium

A point cloud data decoding method, the method comprising:

• acquiring a point cloud data bitstream to be decoded;
• determining starting position information corresponding to a space-filling curve that corresponds to the point cloud data bitstream to be decoded;
• determining residual information corresponding to the point cloud data bitstream to be decoded;
• and
• reconstructing the point cloud data bitstream to be decoded based on the starting position information corresponding to the space-filling curve and the residual information.

A point cloud data processing method, the method comprising:

• acquiring initial point cloud data in a point cloud data processing environment;
• determining a space grid structure corresponding to the initial point cloud data;
• determining a filling order of different point cloud points in the initial point cloud data in the space grid structure;
• determining, based on the filling order of the different point cloud points in the initial point cloud data in the space grid structure, residual information matched with the initial point cloud data;
• encoding, according to the residual information, the initial point cloud data to obtain target point cloud data;
• acquiring a point cloud data bitstream to be decoded;
• determining starting position information corresponding to a space-filling curve that corresponds to the point cloud data bitstream to be decoded;
• determining residual information corresponding to the point cloud data bitstream to be decoded;
• and
• reconstructing, based on the starting position information corresponding to the space-filling curve and the residual information, the point cloud data bitstream to be decoded, to acquire initial point cloud data in a point cloud data processing environment by decoding.