US 11,954,891 B2
Method of compressing occupancy map of three-dimensional point cloud
Eun Young Chang, Daejeon (KR); Euee Seon Jang, Daejeon (KR); Tian Yu Dong, Daejeon (KR); Ji Hun Cha, Daejeon (KR); Kyu Tae Kim, Daejeon (KR); and Jae Young Ahn, Daejeon (KR)
Assigned to Electronics and Telecommunications Research Institute, Daejeon (KR); and IUCF-HYU (Industry-University Cooperation Foundation Hanyang University), Seoul (KR)
Filed by Electronics and Telecommunications Research Institute, Daejeon (KR); and IUCF-HYU (Industry-University Cooperation Foundation Hanyang University), Seoul (KR)
Filed on Jun. 30, 2021, as Appl. No. 17/363,859.
Claims priority of application No. 10-2020-0080607 (KR), filed on Jun. 30, 2020; and application No. 10-2021-0079416 (KR), filed on Jun. 18, 2021.
Prior Publication US 2021/0407145 A1, Dec. 30, 2021
Int. Cl. G06T 9/00 (2006.01); G06T 3/40 (2006.01); G06T 7/00 (2017.01)
CPC G06T 9/001 (2013.01) [G06T 3/40 (2013.01); G06T 7/0002 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A method of compressing an occupancy map of a three-dimensional (3D) point cloud, the method comprising the steps of:
(a) generating an occupancy map image using occupancy map information, compressing the occupancy map image using a video codec, and decompressing the compressed occupancy map image; and
(b) recompressing the occupancy map image generated in the step (a) in consideration of at least one of a user-specified compression quality and a patch-by-patch inspection result of the occupancy map image decompressed in the step (a);
wherein the step (b) includes, in consideration of the patch-by-patch inspection result, inspecting whether an occupied pixel exists for each patch of the occupancy map image decompressed in the step (a) and, in response to existence of a patch having no occupied pixels, lowering a quantization parameter (QP) value for the decompressed occupancy map image to be less than or equal to a preset value and recompressing the occupancy map image generated in the step (a).