US 12,482,144 B2
Method and apparatus of encoding/decoding point cloud geometry data using azimuthal coding mode
Shuo Gao, Beijing (CN); and Sebastien Lasserre, Beijing (CN)
Assigned to Beijing Xiaomi Mobile Software Co., Ltd., Beijing (CN)
Appl. No. 18/553,786
Filed by Beijing Xiaomi Mobile Software Co., Ltd., Beijing (CN)
PCT Filed Oct. 13, 2021, PCT No. PCT/CN2021/123664
§ 371(c)(1), (2) Date Oct. 3, 2023,
PCT Pub. No. WO2022/213571, PCT Pub. Date Oct. 13, 2022.
Claims priority of application No. 21305455 (EP), filed on Apr. 8, 2021.
Prior Publication US 2024/0185475 A1, Jun. 6, 2024
Int. Cl. G06T 9/40 (2006.01); G06T 9/00 (2006.01)
CPC G06T 9/40 (2013.01) [G06T 9/00 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method of encoding a point cloud into a bitstream of encoded point cloud data representing a physical object, the method comprising an azimuthal coding mode providing a series of bits for encoding a coordinate of a point of the point cloud, wherein the method comprises:
dividing a parent interval, to which the point coordinate belongs to, into a left half interval and a right half interval;
interpolating a left angle (φleft,d), associated with the left half interval, and a right angle (φright,d), associated with the right half interval, from at least one inherited angle associated with the parent interval;
selecting a context depending on the left angle (φleft,d) and the right angle (φright,d); and
context-adaptive binary entropy encoding a bit (bd), into the bitstream, based on the selected context, the encoded bit (bd) indicating which of the two half intervals the point coordinate belongs to.