US 12,225,197 B2
Point cloud coding method, point cloud decoding method, and relevant apparatuses
Hui Yuan, Dongguan (CN); Xiaohui Wang, Dongguan (CN); Ming Li, Dongguan (CN); Lu Wang, Dongguan (CN); and Qi Liu, Dongguan (CN)
Assigned to GUANGDONG OPPO MOBILE TELECOMMUNICATIONS CORP., LTD., Dongguan (CN)
Filed by GUANGDONG OPPO MOBILE TELECOMMUNICATIONS CORP., LTD., Dongguan (CN)
Filed on Mar. 24, 2023, as Appl. No. 18/126,082.
Application 18/126,082 is a continuation of application No. PCT/CN2020/117941, filed on Sep. 25, 2020.
Prior Publication US 2023/0232002 A1, Jul. 20, 2023
Int. Cl. H04N 11/02 (2006.01); H04N 19/124 (2014.01); H04N 19/14 (2014.01); H04N 19/176 (2014.01)
CPC H04N 19/124 (2014.11) [H04N 19/14 (2014.11); H04N 19/176 (2014.11)] 20 Claims
OG exemplary drawing
 
1. A method for point cloud encoding, comprising:
partitioning a point cloud, and determining a current coding block;
determining a quantization parameter optimization enable identifier, a hierarchical level index, and a quantization parameter offset parameter of the current coding block;
determining, according to the hierarchical level index and the quantization parameter offset parameter, a quantization step Qstep corresponding to a level of detail (LOD); and
upon detecting that the quantization parameter optimization enable identifier is a first value, performing the following operations for one or more points included in the current coding block;
determining an LODi where a currently processed point Pi is located;
predicting the point Pi according to the LODi to obtain a prediction value of the point Pi;
determining a quantization step Qstepi which is adaptive to the LODi;
determining, according to the prediction value of the point Pi and an original value of the point Pi, a residual of the point Pi;
quantizing the residual of the point Pi according to the quantization step Qstepi to obtain a quantized residual of the point Pi; and
encoding and signalling the quantization parameter optimization enable identifier.