公开(公告)号：US11954891B2

公开(公告)日：2024-04-09

申请号：US17363859

申请日：2021-06-30

Applicant: Electronics and Telecommunications Research Institute ,  IUCF-HYU (Industry-University Cooperation Foundation Hanyang University)

Inventor： Eun Young Chang ,  Euee Seon Jang ,  Tian Yu Dong ,  Ji Hun Cha ,  Kyu Tae Kim ,  Jae Young Ahn

IPC: G06T9/00 ,  G06T3/40 ,  G06T7/00

CPC classification number: G06T9/001 ,  G06T3/40 ,  G06T7/0002

Abstract: Provided is a method of compressing an occupancy map of a three-dimensional (3D) point cloud, and more specifically, a method of compressing an occupancy map of a point cloud in which an occupancy map image of a point cloud existing in a 3D space is compressed based on a compression quality or a patch-by-patch inspection method of the occupancy map image so that compression distortion is minimized when reconstructing the compressed occupancy map image so as to remarkably improve the quality of a reconstructed occupancy map image.

公开(公告)号：US10191450B2

公开(公告)日：2019-01-29

申请号：US15381520

申请日：2016-12-16

Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE

Inventor： Eun Young Chang

IPC: G03H1/22 ,  G03H1/08

Abstract: Provided is a method and apparatus for generating a binary hologram. More particularly, provided is a method and apparatus that may decrease or, alternatively, minimize quality degradation of a binary hologram by employing a silhouette mask of a target object to reduce or, alternatively, minimize background noise occurring around the target object to be reproduced when generating the binary hologram.

公开(公告)号：US09869971B2

公开(公告)日：2018-01-16

申请号：US14987287

申请日：2016-01-04

Applicant: Electronics and Telecommunications Research Institute

Inventor： Eun Young Chang ,  Soo Hyun Lee ,  Jin Woong Kim ,  Tae One Kim ,  Kyung Ae Moon ,  Joong Ki Park

IPC: G03H1/22 ,  G03H1/08 ,  G03H1/02

CPC classification number: G03H1/2294 ,  G03H1/0808 ,  G03H2001/0224 ,  G03H2001/2236 ,  G03H2001/2239 ,  G03H2210/30 ,  G03H2225/60

Abstract: Provided is a hologram generation method including receiving three-dimensional (3D) data information, determining a first projection position onto which the 3D data information is projected on a hologram plane corresponding to a first spatial light modulator (SLM), and a second projection position onto which the 3D data information is projected on a hologram plane corresponding to a second SLM, generating a first Fresnel zone plate (FZP) pattern corresponding to the first projection position, and determining the first FZP pattern to be an FZP pattern corresponding to the second projection position.

公开(公告)号：US11151748B2

公开(公告)日：2021-10-19

申请号：US16509677

申请日：2019-07-12

Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE ,  IUCF-HYU (INDUSTRY-UNIVERSITY COOPERATION FOUNDATION HANYANG UNIVERSITY)

Inventor： Eun Young Chang ,  Ji Hun Cha ,  Su Gil Choi ,  Euee Seon Jang ,  Min Ku Lee ,  You Sun Park

IPC: G06T9/00

Abstract: There is provided a method of decoding point cloud data, the method comprising: decoding a bitstream to obtain attribute information of point cloud data, acquiring attributes of the point cloud data using the decoded attribute information and reconstructing the point cloud data using the obtained attributes, wherein the attribute information contains bit depth information of each attribute of the point cloud data.

公开(公告)号：US10895842B2

公开(公告)日：2021-01-19

申请号：US16218252

申请日：2018-12-12

Applicant: Electronics and Telecommunications Research Institute

Inventor： Eun Young Chang

IPC: G06K9/00 ,  G03H1/08 ,  G03H1/22

Abstract: In the present invention, by receiving three-dimensional spatial data for a three-dimensional object, calculating a size of an elemental fringe pattern for each depth and a maximum size of the elemental fringe pattern for the three-dimensional spatial data, dividing the entire resolution of an entire predetermined hologram into a plurality of segments based on the number of divisions of the horizontal direction and the vertical direction, expanding resolution for each segment based on a maximum size for the elemental fringe pattern size, calculating a plurality of segment unit holograms for each of the segments, and accumulating overlapping regions between the plurality of segment unit holograms to produce the entire hologram for the entire resolution, it is possible to provide a hologram generating apparatus and method which may generate a hologram having a higher resolution at a faster speed than the conventional one.