公开(公告)号：US12158727B2

公开(公告)日：2024-12-03

申请号：US17621890

申请日：2020-12-02

Applicant: Korea Electronics Technology Institute

Inventor： Sung Hee Hong ,  Young Min Kim ,  Ji Soo Hong ,  Jin Soo Jeong

IPC: G03H1/04

Abstract: Provided is a hologram printing method and apparatus using a hologram medium light efficiency map. A hologram printing method according to an embodiment emits a laser to a hologram medium, acquires an image by photographing light diffracted from the hologram medium, generates a light efficiency map of the hologram medium from the acquired image, and records hogels on the hologram medium by referring to the generated light efficiency maps of the hologram medium. Accordingly, light efficiency is measured on each hogel area, and hologram printing is performed by adjusting an intensity of a laser of each wavelength according to a hogel, so that uniformity of luminance and color of a hologram printing result can be enhanced.

公开(公告)号：US12298713B2

公开(公告)日：2025-05-13

申请号：US17622952

申请日：2020-12-02

Applicant: Korea Electronics Technology Institute

Inventor： Sung Hee Hong ,  Young Min Kim ,  Ji Soo Hong ,  Jin Soo Jeong

IPC: G03H1/04 ,  G03H1/02 ,  G03H1/12

Abstract: A method and an apparatus for printing a hologram by using a mask are provided. A method generates a hologram fringe pattern, splits the hologram fringe pattern on a hogel basis, generates the split hogels, masks a part of the generated hogel, and prints the masked hogel on a hologram medium. Accordingly, an empty space which occurs between hogels when a hologram is printed is prevented from being generated by using a mask, so that a fill factor can be effectively enhanced, and eventually, image quality of a hologram can be enhanced.

公开(公告)号：US12249032B2

公开(公告)日：2025-03-11

申请号：US18013317

申请日：2021-12-15

Applicant: Korea Electronics Technology Institute

Inventor： Ji Soo Hong ,  Sung Hee Hong ,  Young Min Kim ,  Jin Soo Jeong ,  Byoung Hyo Lee

IPC: G06T19/00 ,  G03H1/22 ,  G06T3/403

Abstract: Provided is a cognitive experiment method for change in periphery region image quality for parameter determination of a foveated hologram. According to an embodiment, a cognitive experiment method for determining foveated image parameters includes: generating a foveated image which includes a foveal region and a periphery region while reducing image quality regarding the periphery region; displaying the generated foveated image; receiving an input of a response to image quality of the periphery region from a subject; and collecting information regarding appropriate image quality of the periphery region, based on the response inputted by the subject. Accordingly, in applying a foveated hologram generation algorithm for real-time reproduction, various parameters such as a boundary between a foveal region image and a periphery region image in a foveated hologram, and a degree of quality degradation of the periphery region image may be appropriately determined through a cognitive experiment.