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1.发明公开公开(公告)号：US20240118661A1
公开(公告)日：2024-04-11
申请号：US18013321
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: G03H1/04
CPC classification number: G03H1/0476 , G03H2001/0482 , G03H2223/24 , G03H2225/32 , G03H2225/52 , G03H2226/00
Abstract: Provided is a holographic optical element printing method using a tunable focus lens and a rotating mirror. According to an embodiment, a holographic printer includes: a first optical engine and a second optical engine configured to adjust a phase of an incident collimated beam and emit the collimated beam; and a first reduction optical system and a second reduction optical system configured to reduce the beam emitted from the first optical engine and the second optical engine and to allow the beam to enter a holographic material, wherein each of the first optical engine and the second optical engine includes: a rotating mirror configured to reflect while adjusting the phase of the incident collimated beam through rotation; and a tunable focus lens configured to refract while adjusting the phase of the incident collimated beam reflected from the rotating mirror through focus tuning. Accordingly, by using a combination of a tunable focus lens and a rotating mirror, instead of using an SLM of a holographic printer, quality of an HOE may be enhanced, a printing time per hogel may be reduced and a total recording time may be greatly reduced when holographic printing of the HOE is performed.
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公开(公告)号：US20240393509A1
公开(公告)日：2024-11-28
申请号：US18343886
申请日：2023-06-29
Applicant: Korea Electronics Technology Institute
Inventor： Ji Soo HONG , Sung Hee HONG , Young Min KIM , Jin Soo JEONG , Yong Hwa KIM , Byoung Hyo LEE , Hyeon Chan OH
Abstract: There is provided a thin optical system for real-world occlusion in an augmented reality display. The optical system according to an embodiment includes: a first DCRA configured to reflect light beams focused on holes; a mask positioned on a light emitting surface of the first DCRA to pass or block the light beams emitted from the first DCRA; and a second DCRA configured to reflect the light beams which are focused on holes after passing through the mask. Accordingly, the optical system can implement real-world occlusion in the unit of pixel while having a thin form factor.
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公开(公告)号：US20230367261A1
公开(公告)日：2023-11-16
申请号：US18030093
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
CPC classification number: G03H1/0476 , G03H2223/53
Abstract: Provided are a holographic printing device and method using multiple optical heads. The holographic printing device according to an embodiment of the present invention comprises: a fringe pattern generation unit which generates a holographic fringe pattern, and segments the generated fringe pattern into hogels; a multiplexing unit which groups the hogels, segmented by the fringe pattern generation unit, according to area; and a plurality of optical heads which respectively receive the grouped hogels and print the respective hogels in the corresponding areas of a holographic medium. Accordingly, several hogels can be printed on the holographic medium at a time using the multiple optical heads, thus reducing holographic printing time so that even large screen holograms can be printed at high speed.
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Patent Agency Ranking
公开(公告)号：US20220365483A1
公开(公告)日：2022-11-17
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.
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公开(公告)号：US20240111250A1
公开(公告)日：2024-04-04
申请号：US18013305
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
CPC classification number: G03H1/0476 , G03H1/024 , G03H1/2249 , G03H2001/0224 , G03H2001/0232 , G03H2001/2263
Abstract: Provided is a hologram image normalization method for a holographic printer. In a holographic printing method according to an embodiment, generating, encoding, and normalizing for the (n+1)-th hogel are performed in parallel with loading and recording of a normalized hologram for the n-th hogel, and moving and waiting for the (n+1)-th hogel. Accordingly, a global maximum value and a global minimum value for normalization may be calculated as approximate estimation values, and a hologram generation process and a printing process may be performed in parallel, so that a total printing time may be minimized and memory usage may be optimized when holographic printing is performed.
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公开(公告)号：US20240397167A1
公开(公告)日：2024-11-28
申请号：US18344065
申请日：2023-06-29
Applicant: Korea Electronics Technology Institute
Inventor： Ji Soo HONG , Sung Hee HONG , Young Min KIM , Jin Soo JEONG , Yong Hwa KIM , Byoung Hyo LEE , Hyeon Chan OH
IPC: H04N21/8358 , H04N21/234 , H04N21/239 , H04N21/24
Abstract: There is provided an object attribute-based watermarking method for preventing leakage of a digital content. A video watermarking method according to an embodiment may acquire a requested video and watermarking information upon receiving a request for video streaming from a user, may determine some of objects appearing in the video according to the watermarking information, may transform attributes of the determined objects, and may stream the transformed video. Accordingly, by watermarking an attribute of an object appearing in a video differently according to a user and providing the video, a watermark may be difficult to perceive, robustness against various attacks may be guaranteed, and a leakage path of a content may be checked.
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7.发明公开公开(公告)号：US20240119673A1
公开(公告)日：2024-04-11
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
CPC classification number: G06T19/00 , G03H1/2294 , G06T3/403 , G06T2200/24 , G06T2210/36
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.
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公开(公告)号：US20230047713A1
公开(公告)日：2023-02-16
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
Abstract: Provided are a method and an apparatus for printing a hologram by using a mask. The hologram printing method according to an embodiment 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.
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