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WO2023113061A1 - Procédé d'impression à stéréogrammes holographiques basé sur des sous-hogels - Google Patents

Procédé d'impression à stéréogrammes holographiques basé sur des sous-hogels Download PDF

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Publication number
WO2023113061A1
WO2023113061A1 PCT/KR2021/019024 KR2021019024W WO2023113061A1 WO 2023113061 A1 WO2023113061 A1 WO 2023113061A1 KR 2021019024 W KR2021019024 W KR 2021019024W WO 2023113061 A1 WO2023113061 A1 WO 2023113061A1
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WO
WIPO (PCT)
Prior art keywords
image
slm
holographic stereogram
diffuser
generating
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/KR2021/019024
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English (en)
Korean (ko)
Inventor
홍지수
홍성희
김영민
정진수
이병효
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Korea Electronics Technology Institute
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Korea Electronics Technology Institute
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Filing date
Publication date
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Publication of WO2023113061A1 publication Critical patent/WO2023113061A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
    • G03H1/04—Processes or apparatus for producing holograms
    • G03H1/0476—Holographic printer
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
    • G03H1/04—Processes or apparatus for producing holograms
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
    • G03H1/22—Processes or apparatus for obtaining an optical image from holograms
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
    • G03H1/04—Processes or apparatus for producing holograms
    • G03H1/0402—Recording geometries or arrangements
    • G03H2001/0439—Recording geometries or arrangements for recording Holographic Optical Element [HOE]
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H2223/00—Optical components
    • G03H2223/14—Diffuser, e.g. lens array, random phase mask

Definitions

  • the present invention relates to holographic printing, and more particularly, to a method for performing holographic stereogram printing based on a sub-hogel rather than a hogel.
  • the rendered image in charge of each hogel is optically imaged and displayed at an infinite distance, and the hologram printed in the stereogram method in this way can be said to show a three-dimensional image in the light field method as a whole.
  • the complex field h (m,n), which should be recorded in the (m,n )th hogel represents the rendered image of the (m,n)th hogel as c(m,n ), and when the random phase applied thereto is ⁇ rand.(m, n) , it is as follows.
  • Figure 2 shows the structure of the optical engine of the holographic stereogram printer to transmit such a complex field as object light to each hogel.
  • the image to be displayed by each hogel is projected onto the SLM (Spatial Light Modulator), and the projected image is imaged on the diffuser surface through a 4f-system consisting of two lenses with a focal length of f 1 . do.
  • SLM Surface Light Modulator
  • the diffuser serves to apply a random phase to the image of the SLM, and again, this diffuser surface is reduced by a reduction factor of (f 3 /f 2 ) through a 4f-system composed of two lenses with focal lengths of f 2 and f 3 It becomes.
  • an appropriate spatial filter may be selectively placed on the intermediate Fourier plane as needed, and through this, various noises such as DC noise may be removed to improve image quality.
  • this reduced image is Fourier transformed by a lens with a focal length of f 4 and transmitted to the surface of the holographic medium, and the original target complex field can be transmitted as a hogel.
  • the number of hogels determines the spatial resolution of the light field image, and the resolution of the SLM image recorded in each hogel. determines each resolution of the light field image.
  • each resolution of the light field image is allocated excessively high, and in order to secure the spatial resolution of the light field image, hogels must be printed as many as the number of desired spatial resolutions, which increases the holographic printing recording time. .
  • the present invention was made to solve the above problems, and an object of the present invention is to shorten the holographic printing recording time, and in holographic stereogram printing, one SLM image can print several subhogels It is to provide a way to be in charge and record.
  • a holographic stereogram printer includes a modulator for generating a Spatial Light Modulated Image (SLM) image; A front-end optical system for imaging the generated SLM image to the diffuser; a diffuser that scatters the imaged SLM image; a 2D lens array generating a multi-view SLM image from the scattered SLM image; and a rear-end optical system for incidentally generating multi-viewpoint SLM images onto a holographic medium.
  • SLM Spatial Light Modulated Image
  • the 2D lens array may generate multi-view SLM images such that the SLM images of each view are incident on sub-hogels of different hogels in a holographic medium.
  • the SLM image may consist of sub-hogels at the same location in different hogels.
  • the 2D lens array may be spaced apart from the diffuser by a focal distance of each lens constituting the 2D lens array.
  • the size of the 2D lens array may be the same as that of the SLM image.
  • the number of viewpoints in the x and y directions of the multi-view image generated by the 2D lens array may be Mx,My.
  • Angular resolutions in the x and y directions that can be expressed by each sub-hogel constituting one hogel may be 1/Mx,1/My.
  • the SLM image may be configured by mapping the (nx,ny) th pixel in the (mx,my) th rendered image to the (mx,my) th pixel in the (nx,ny) th SLM image.
  • a holographic stereogram printing method includes generating an SLM image; imaging the generated SLM image to a diffuser; scattering the imaged SLM image; generating a multi-view SLM image from the scattered SLM image; Incidentally, the generated multi-viewpoint SLM image is projected onto a holographic medium.
  • a holographic stereogram printer includes a modulator for generating an SLM image in which rendered images are divided into subhogel units; A front-end optical system for imaging the generated SLM image to the diffuser; a diffuser that scatters the imaged SLM image; a 2D lens array for generating multi-view SLM images separated by subhogel units from the scattered SLM images; and a rear-end optical system for incidentally generating multi-viewpoint SLM images onto a holographic medium.
  • a holographic stereogram method includes generating a Spatial Light Modulated Image (SLM) image in which rendered images are divided into subhogel units; imaging the generated SLM image to a diffuser; scattering the imaged SLM image; generating a multi-view SLM image divided into subhogel units from the scattered SLM image; Incidentally, the generated multi-viewpoint SLM image is projected onto a holographic medium.
  • SLM Spatial Light Modulated Image
  • holographic stereogram printing in holographic stereogram printing, several subhogels can be recorded with one SLM image, thereby recognizing each resolution of the 3D image to be displayed.
  • the hologram printing time can be greatly shortened without deterioration in performance.
  • information of SLM (Spatial Light Modulator) recorded in one hogel in the existing holographic stereogram printer is divided into several sub-hogels and recorded, so that one SLM Among this expressible light field information, a method for allocating the excessive amount of information of each resolution by dividing it by the spatial resolution is presented.
  • SLM Spatial Light Modulator
  • FIG. 3 shows the relationship between images before and after the last lens of the optical engine of the Hogel-based holographic stereogram.
  • the image of the diffuser image is reduced by the reduction magnification of the reduction optical system, and the lens is placed at a distance equal to the focal length of the lens, and the holographic medium is placed at a distance equal to the focal length behind the lens.
  • Light emitted from each pixel of the reduced diffuser image is superimposed and recorded as parallel light in the Hogel area on the graphic medium surface, which means that optical Fourier transformation takes place.
  • the light emitted from each pixel on the image plane of the reduced diffuser should be divided by the number of sub-hogels for each angle to send different information. do.
  • the image on the diffuser surface must be given in the form of a multi-view image.
  • FIG. 6 the structure of an optical engine of a holographic stereogram printer according to an embodiment of the present invention is shown in FIG. 6 .
  • the holographic stereogram printer according to an embodiment of the present invention divides one SLM image (Spatial Light Modulated Image) into desired subhogels to record a holographic stereogram.
  • SLM image Spatial Light Modulated Image
  • the holographic stereogram printer according to an embodiment of the present invention performing such a function includes the SLM 110, the front optical system 120, the diffuser 130, the 2D lens array 140, and the rear optical system. (150).
  • the SLM 110 generates an SLM image (holographic fringe pattern) that is a spatial light modulated image.
  • the front optical system 120 is a 4f-system composed of two lenses having a focal length f 1 , and images the SLM image generated by the SLM 110 on the surface of the diffuser 130 .
  • the diffuser 130 serves to scatter the imaged SLM image, that is, to apply a random phase to the SLM image.
  • the 2D lens array 140 generates a multi-view SLM image from the SLM image scattered by the diffuser 130 .
  • the rear optical system 150 is an optical system that records the multi-viewpoint SLM image generated by the 2D lens array 140 by entering it into the holographic medium 200, and is a 4f-system composed of two lenses with focal lengths f 2 and f 3 . , a spatial filter, and a lens with a focal length of f 4 .
  • the 2D lens array 140 has the same size as the SLM image and the diffuser image.
  • the 2D lens array 140 is spaced apart from the diffuser 130 by f LA , which is the focal length of each lens of the 2D lens array 140, so that a multi-view image showing different information for each angle can be implemented.
  • the size of each lens constituting the 2D lens array 140 in the x and y directions is Ax and Ay
  • the size of each pixel of the SLM image imaged on the diffuser 130 in the x and y directions is px
  • Mx,My are also the number of viewpoints in the x,y directions of the multi-view image generated by the 2D lens array 140, and the number of subhogels divided from one hogel in the holographic medium 200 in the x,y directions is also
  • each resolution in the x and y directions that each subhogel can express becomes 1/Mx,1/My, and decreases in inverse proportion as Mx and My increase.
  • FIG. 7 is a diagram illustrating a method of generating a rendering image to be applied to the SLM 110 generating the SLM image in the holographic stereogram printer according to an embodiment of the present invention.
  • a hogel on which one SLM image is recorded has (Mx ⁇ My) number of (Mx ⁇ My) number of image information each having (Nx,Ny) number of pixels in x and y directions. Since they are sub-hogels, the image rendering system first needs to render the images that these sub-hogels are in charge of. Next, it is necessary to map the rendered images into SLM images each having (MxNx,MyNy) pixels in the x and y directions.
  • the SLM image is regarded as tiled with (Nx ⁇ Ny) images having (Mx ⁇ My) pixels, and each of them is indexed with a lowercase index.
  • the mapping method is to map the (nx,ny)th pixel in the (mx,my)th subhogel rendering image to the (mx,my)th pixel in the (nx,ny)th SLM image of the SLM tiling image.
  • the recording time is (1/Mx) without deteriorating the overall cognitive image quality in holographic stereogram printing It is reduced by ⁇ (1/My).
  • a 2D lens array was added to the holographic stereogram printer to generate multi-viewpoint images from the SLM images, and the generated SLM images at each viewpoint were recorded on the subhogels of different hogels in a holographic medium.
  • the SLM image generated by the SLM was configured to consist of sub-hogels at the same location in different hogels.
  • the hologram printing time is greatly shortened while there is no cognitive performance degradation for each resolution of the hologram image to be displayed.
  • the technical spirit of the present invention can also be applied to a computer-readable recording medium containing a computer program for performing the functions of the apparatus and method according to the present embodiment.
  • technical ideas according to various embodiments of the present invention may be implemented in the form of computer readable codes recorded on a computer readable recording medium.
  • the computer-readable recording medium may be any data storage device that can be read by a computer and store data.
  • the computer-readable recording medium may be ROM, RAM, CD-ROM, magnetic tape, floppy disk, optical disk, hard disk drive, and the like.
  • computer readable codes or programs stored on a computer readable recording medium may be transmitted through a network connected between computers.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Holo Graphy (AREA)

Abstract

L'invention concerne un procédé d'impression à stéréogrammes holographiques basé sur des sous-hogels. Une imprimante à stéréogrammes holographiques selon un mode de réalisation de la présente invention comprend : un modulateur servant à générer une image de modulateur spatial de lumière (SLM) ; un système optique frontal servant à imager sur un diffuseur l'image SLM générée ; le diffuseur, qui sert à diffuser l'image SLM imagée ; un réseau de lentilles 2D servant à générer une image SLM multivues à partir de l'image SLM diffusée ; et un système optique arrière servant à insérer l'image SLM multivue générée dans un support holographique. Par conséquent, plusieurs sous-hogels peuvent être enregistrés en utilisant une image SLM dans l'impression à stéréogrammes holographiques, et, par conséquent, le temps d'impression d'hologrammes peut être fortement réduit même sans diminuer les performances cognitives par rapport aux résolutions respectives d'une image tridimensionnelle devant être représentée.
PCT/KR2021/019024 2021-12-13 2021-12-15 Procédé d'impression à stéréogrammes holographiques basé sur des sous-hogels Ceased WO2023113061A1 (fr)

Applications Claiming Priority (2)

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KR1020210177360A KR102586660B1 (ko) 2021-12-13 2021-12-13 서브 호겔 기반 홀로그래픽 스테레오그램 프린팅 방법
KR10-2021-0177360 2021-12-13

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WO2025121488A1 (fr) * 2023-12-07 2025-06-12 한국전자기술연구원 Procédé et système de génération de motif d'hologramme de microstructuration de type stéréogramme à haute résolution pour nano-impression

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008197246A (ja) * 2007-02-09 2008-08-28 Fujifilm Corp ホログラム作成方法及びホログラム作成装置
JP2010197916A (ja) * 2009-02-27 2010-09-09 Dainippon Printing Co Ltd 投射型映像表示装置および映像表示方法
EP1131681B1 (fr) * 1998-11-18 2014-01-01 Zebra Imaging, Inc. Procede et appareil d'enregistrement en une seule etape de stereogrammes holographiques a couleur pure et en parallaxe complet
KR20160030034A (ko) * 2014-09-05 2016-03-16 전자부품연구원 홀로그램과 다시점 영상을 이용한 3차원 영상 시스템 및 디스플레이 방법
CN207731088U (zh) * 2017-11-28 2018-08-14 深圳盟云全息文化有限公司 一种全息图像制作装置

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000259070A (ja) * 1999-03-10 2000-09-22 Hamamatsu Photonics Kk ホログラム作成装置および方法
JP2001350395A (ja) * 2000-06-08 2001-12-21 Sony Corp ホログラフィックステレオグラム露光装置及び方法、並びにホログラフィックステレオグラム作成システム

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1131681B1 (fr) * 1998-11-18 2014-01-01 Zebra Imaging, Inc. Procede et appareil d'enregistrement en une seule etape de stereogrammes holographiques a couleur pure et en parallaxe complet
JP2008197246A (ja) * 2007-02-09 2008-08-28 Fujifilm Corp ホログラム作成方法及びホログラム作成装置
JP2010197916A (ja) * 2009-02-27 2010-09-09 Dainippon Printing Co Ltd 投射型映像表示装置および映像表示方法
KR20160030034A (ko) * 2014-09-05 2016-03-16 전자부품연구원 홀로그램과 다시점 영상을 이용한 3차원 영상 시스템 및 디스플레이 방법
CN207731088U (zh) * 2017-11-28 2018-08-14 深圳盟云全息文化有限公司 一种全息图像制作装置

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KR20230089033A (ko) 2023-06-20

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