US 12,445,647 B2
Method and apparatus for encoding/decoding point cloud coordinate transformation residual
Wei Zhang, Shenzhen (CN); Fuzheng Yang, Shenzhen (CN); Tian Chen, Shenzhen (CN); and Wenjie Zou, Shenzhen (CN)
Assigned to HONOR DEVICE CO., LTD., Shenzhen (CN)
Appl. No. 18/265,850
Filed by Honor Device Co., Ltd., Shenzhen (CN)
PCT Filed May 18, 2022, PCT No. PCT/CN2022/093677
§ 371(c)(1), (2) Date Jun. 7, 2023,
PCT Pub. No. WO2022/247715, PCT Pub. Date Dec. 1, 2022.
Claims priority of application No. 202110580212.1 (CN), filed on May 26, 2021.
Prior Publication US 2025/0080772 A1, Mar. 6, 2025
Int. Cl. H04N 19/60 (2014.01)
CPC H04N 19/60 (2014.11) 20 Claims
OG exemplary drawing
 
1. A method for encoding a point cloud coordinate transformation residual, comprising:
obtaining original point cloud data;
transforming coordinates of the original point cloud data to obtain a coordinate transformation residual;
establishing a relationship between azimuth information of a point cloud and the coordinate transformation residual, wherein establishing the relationship between the azimuth information of the point cloud and the coordinate transformation residual comprises:
establishing function expressions between the azimuth information of the point cloud and the coordinate transformation residual as follows:

OG Complex Work Unit Math
wherein Δx and Δy represent coordinate transformation residual components of a point, r represents depth information of the point, φ represents azimuth information of the point, Δr represents a precision loss of the depth information of the point, and Δφ represents a precision loss of the azimuth information of the point;
determining an encoding rule for the coordinate transformation residual based on the relationship between the azimuth information of the point cloud and the coordinate transformation residual; and
encoding the coordinate transformation residual according to the encoding rule, to obtain data rate information.