US 12,488,511 B2
Apparatus and method for point cloud processing
Muhammad Asad Lodhi, Highland Park, NJ (US); Jiahao Pang, Plainsboro, NJ (US); and Dong Tian, Boxborough, MA (US)
Assigned to InterDigital Patent Holdings, Inc., Wilmington, DE (US)
Appl. No. 18/271,738
Filed by InterDigital Patent Holdings, Inc., Wilmington, DE (US)
PCT Filed Jan. 10, 2022, PCT No. PCT/US2022/011764
§ 371(c)(1), (2) Date Jul. 11, 2023,
PCT Pub. No. WO2022/150680, PCT Pub. Date Jul. 14, 2022.
Claims priority of provisional application 63/135,775, filed on Jan. 11, 2021.
Prior Publication US 2024/0078715 A1, Mar. 7, 2024
Int. Cl. G06T 9/40 (2006.01)
CPC G06T 9/40 (2013.01) 20 Claims
OG exemplary drawing
 
1. An apparatus comprising a processor configured to receive a bitstream including a compressed point cloud represented as a tree structure; and to decode the bitstream by, starting from a root node of the tree structure as a current node:
constructing a context for the current node comprising at least one of a level, an octant, a location, or a parent of the current node;
predict an occupancy symbol distribution that indicates child nodes occupancy probabilities for the current node by using a learning-based entropy model based on the context for the current node and feature information from one or more available neighboring nodes and from one or more ancestor nodes of the current node; and
decode an occupancy symbol for the current node using an adaptive entropy decoder based on the occupancy symbol distribution;
expanding the tree structure based on the decoded occupancy symbol; and
output the expanded tree structure representative of a reconstruction of the compressed point cloud.