	US 12,074,617 B2
	Methods and devices for tree switching in point cloud compression
Sébastien Lasserre, Thorigné-Fouillard (FR); Jonathan Taquet, Talensac (FR); and Gaëlle Christine Martin-Cocher, Toronto (CA)
Assigned to BlackBerry Limited, Waterloo (CA)
Appl. No. 17/767,357
Filed by BlackBerry Limited, Waterloo (CA)
PCT Filed Oct. 11, 2019, PCT No. PCT/IB2019/001188 § 371(c)(1), (2) Date Apr. 7, 2022, PCT Pub. No. WO2021/069949, PCT Pub. Date Apr. 15, 2021.
Prior Publication US 2022/0376702 A1, Nov. 24, 2022
Int. Cl. H03M 7/40 (2006.01); H03M 7/30 (2006.01)

CPC H03M 7/40 (2013.01) [H03M 7/70 (2013.01)]

15 Claims

1. A method of decoding a bitstream of compressed point cloud data representing a three-dimensional location of a physical object, for generating a point cloud data, the point cloud data being located within a volumetric space, the method comprising:

decoding a first part of the point cloud data represented by a first tree of a first type;

determining for a given node of the first tree if an assignation to a second type of tree is enabled, said given node still being processed for the first tree, wherein determining the assignation comprises decoding from the bitstream an assignation flag that signals whether the assignation to the second type of tree is performed or not for the given node;

when the assignation is enabled, decoding a second part of the point cloud data represented by a second tree of the second type, wherein features associated with a root node of the second tree are at least partially obtained from the given node.