公开(公告)号：US20240098263A1

公开(公告)日：2024-03-21

申请号：US18058634

申请日：2022-11-23

Applicant: KOREA ELECTRONICS TECHNOLOGY INSTITUTE

Inventor： Yong Hwan Kim ,  Yura Kim ,  Jong-geun Park ,  Hyun Ho Kim

IPC: H04N19/119 ,  H04N19/136 ,  H04N19/167 ,  H04N19/85

CPC classification number: H04N19/119 ,  H04N19/136 ,  H04N19/167 ,  H04N19/85

Abstract: A device and method for performing fast grid-based refining segmentation (FGRS) for video-based point cloud compression (V-PCC) is proposed. The method may include dividing a space of a three-dimensional (3D) point cloud into multiple grids to derive multiple voxels, searching for filled voxels including one or more points, searching for surrounding voxels which are filled voxels within a certain radius from each of the filled voxels, and searching for edge voxels which are present at a segment edge among all the filled voxels. The method may also include calculating smooth scores for surrounding voxels of each edge voxel and calculating a smooth score sum which is a smooth score for the edge voxel on the basis of the smooth scores of the surrounding voxels of the edge voxel, and updating a projection plane index (PPI) for each individual point in the edge voxel using the calculated smooth score sum.

公开(公告)号：US12184849B2

公开(公告)日：2024-12-31

申请号：US18058634

申请日：2022-11-23

Applicant: KOREA ELECTRONICS TECHNOLOGY INSTITUTE

Inventor： Yong Hwan Kim ,  Yura Kim ,  Jong-geun Park ,  Hyun Ho Kim

IPC: H04N7/12 ,  H04N19/119 ,  H04N19/136 ,  H04N19/167 ,  H04N19/423 ,  H04N19/85

Abstract: A device and method for performing fast grid-based refining segmentation (FGRS) for video-based point cloud compression (V-PCC) is proposed. The method may include dividing a space of a three-dimensional (3D) point cloud into multiple grids to derive multiple voxels, searching for filled voxels including one or more points, searching for surrounding voxels which are filled voxels within a certain radius from each of the filled voxels, and searching for edge voxels which are present at a segment edge among all the filled voxels. The method may also include calculating smooth scores for surrounding voxels of each edge voxel and calculating a smooth score sum which is a smooth score for the edge voxel on the basis of the smooth scores of the surrounding voxels of the edge voxel, and updating a projection plane index (PPI) for each individual point in the edge voxel using the calculated smooth score sum.

公开(公告)号：US11954890B2

公开(公告)日：2024-04-09

申请号：US17233195

申请日：2021-04-16

Applicant: KOREA ELECTRONICS TECHNOLOGY INSTITUTE

Inventor： Yong Hwan Kim ,  Jieon Kim ,  JinGang Huh ,  Jong-geun Park

IPC: G06T9/00 ,  G06T3/40 ,  H03M7/30

CPC classification number: G06T9/001 ,  G06T3/40 ,  H03M7/3064 ,  H03M7/6011

Abstract: The present disclosure relates to an apparatus and method for fast refining segmentation for a V-PCC encoder. The apparatus may include a grid segmentation unit segmenting a coordinate space of a point cloud into grid units, and an edge cube search unit searching a cube containing one or more points among the cubes segmented into grid units and containing a segment boundary. The apparatus may also include a surrounding cube search unit searching an edge surrounding cube containing one or more points within a predetermined range from the edge cube, and a smooth score calculation unit calculating smooth scores for all the edge surrounding cubes and all the edge cubes. The apparatus may further include a projection plane index update unit obtaining a normal score based on the calculated smooth scores and updating a projection plane index of each point in the edge cube using the normal score.