US 11,943,457 B2
Information processing apparatus and method
Tsuyoshi Kato, Kanagawa (JP); Satoru Kuma, Tokyo (JP); Ohji Nakagami, Tokyo (JP); Hiroyuki Yasuda, Saitama (JP); and Koji Yano, Tokyo (JP)
Assigned to SONY GROUP CORPORATION, Tokyo (JP)
Appl. No. 17/438,269
Filed by SONY GROUP CORPORATION, Tokyo (JP)
PCT Filed Mar. 5, 2020, PCT No. PCT/JP2020/009331
§ 371(c)(1), (2) Date Sep. 10, 2021,
PCT Pub. No. WO2020/189296, PCT Pub. Date Sep. 24, 2020.
Claims priority of application No. 2019-051291 (JP), filed on Mar. 19, 2019; application No. 2019-118635 (JP), filed on Jun. 26, 2019; and application No. 2019-181399 (JP), filed on Oct. 1, 2019.
Prior Publication US 2022/0191520 A1, Jun. 16, 2022
Int. Cl. H04N 19/30 (2014.01); H04N 19/124 (2014.01); H04N 19/169 (2014.01); H04N 19/50 (2014.01)
CPC H04N 19/30 (2014.11) [H04N 19/124 (2014.11); H04N 19/1883 (2014.11); H04N 19/50 (2014.11)] 16 Claims
OG exemplary drawing
 
1. An information processing apparatus comprising
a hierarchization unit configured to perform hierarchization of attribute information about a point cloud representing a three-dimensional object by recursively repeating, on a reference point, a process of classifying points of the point cloud into a prediction point that is a point at which a difference value between the attribute information and a predicted value is left, and the reference point that is a point at which the attribute information is referred to during derivation of the predicted value,
wherein, during the hierarchization, the hierarchization unit is further configured to select the prediction point in such a manner that a point also exists in a voxel of a hierarchical level one level higher than a hierarchical level to which voxels containing points of a current hierarchical level belong; and
a quantization unit configured to quantize the difference value of each point of each hierarchical level, using a quantization weight for each hierarchical level of a plurality of hierarchical levels, the difference value having been generated by the hierarchization unit,
wherein the quantization unit is further configured to quantize the difference value, using the quantization weight for each hierarchical level, the quantization weight for a respective hierarchical level of the plurality of hierarchical levels being set to a value greater than the quantization weight for hierarchical levels of the plurality of hierarchical levels lower than the respective hierarchical level, and
wherein the hierarchization unit and the quantization unit are each implemented via at least one processor.