CN108037651B - Holographic stereogram printing system using converging lens in combination with holographic diffuser film - Google Patents
Holographic stereogram printing system using converging lens in combination with holographic diffuser film Download PDFInfo
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- CN108037651B CN108037651B CN201711499714.1A CN201711499714A CN108037651B CN 108037651 B CN108037651 B CN 108037651B CN 201711499714 A CN201711499714 A CN 201711499714A CN 108037651 B CN108037651 B CN 108037651B
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- 239000004973 liquid crystal related substance Substances 0.000 claims abstract description 15
- 230000000007 visual effect Effects 0.000 abstract description 5
- 239000005338 frosted glass Substances 0.000 abstract description 3
- 230000011218 segmentation Effects 0.000 abstract description 3
- 238000001093 holography Methods 0.000 abstract description 2
- 230000006798 recombination Effects 0.000 abstract 1
- 238000005215 recombination Methods 0.000 abstract 1
- 238000000034 method Methods 0.000 description 12
- 230000000694 effects Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 239000005337 ground glass Substances 0.000 description 5
- 230000003287 optical effect Effects 0.000 description 5
- 230000010287 polarization Effects 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 2
- 230000000144 pharmacologic effect Effects 0.000 description 2
- 241001549498 Penelope purpurascens Species 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- ICXADQHBWHLSCI-UHFFFAOYSA-N dubinine Natural products C1=CC=C2C(OC)=C(CC(O3)C(C)(O)COC(C)=O)C3=NC2=C1 ICXADQHBWHLSCI-UHFFFAOYSA-N 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000002123 temporal effect Effects 0.000 description 1
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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
Abstract
The invention belongs to the field of holography, and particularly relates to a holographic volume view printing system with a converging lens and a holographic scattering film combined. The original holographic stereogram printing system based on the effective visual angle picture segmentation and recombination algorithm is improved, on one hand, a convergent lens is added behind a liquid crystal display screen to regulate and control the propagation direction of light; on the other hand, a holographic scattering film with a proper expansion angle is selected as a scattering medium to replace frosted glass in the original system, so that the divergence of light energy is reduced. The holographic stereogram printing system combining the convergent lens and the holographic scattering film can effectively improve the energy utilization rate and save the holographic printing time.
Description
Technical Field
The invention belongs to the field of holography, and particularly relates to a holographic volume view printing system with a converging lens and a holographic scattering film combined.
Background
The holographic volume view printing can realize the three-dimensional reproduction of a three-dimensional scene, the successive exposure of the holographic unit is needed during printing, and the energy utilization rate is the key research content in the holographic volume view printing. Morozov proposed a spatial multiplexing and temporal multiplexing multiple hologram printing technique [ a.v. morozov, a.n. puerilin, s.s.kopenkin, y.p.borodin, v.v.druzhin, s.e.dubynin, g.b.dubinin, "3D holographic printer: fast printing prophach, "opt.express 22(3), 2193-2206(2014) ]; concern about the introduction proposed a Multichannel hologram recording method [ x.rong, x.yu, c.guan, "Multichannel holographic recording method for three-dimensional displays," appl.opt.50(7), B77-B80(2011) ]; yamaguchi proposes simultaneous exposure of 12 holographic elements using a lens array [ m.yamaguchi, h.endoh, t.koyama, n.ohyama, "High-speed recording of full-parallel pharmacological stereo by a parallel exposure system," op.eng.35 (6), 1556-1559(1996) ]; there are also scholars and companies who propose and realize the use of pulsed lasers for holographic view printing to improve printing efficiency [ d.brotherton-Ratcliffe, s.zacharovas, r.j.bakana, j.pilekas, a.nikolskij, j.kuchi, "Digital pharmaceutical printing used RGB lasers," opt.en.50 (9), 091307 (2011); d.brotherton-Ratcliffe, s.zacharovas, r.j.bakana, j.pilekas, a.nikolskij, j.kuhin, "Digital pharmacological printing used pulsed RGB lasers," opt.eng.50 (9): 091307(2011)].
The method can improve the energy utilization rate in the holographic stereogram printing process and save the printing time, but the cost can be greatly improved no matter a multi-spatial light modulator, a lens array or a pulse laser is adopted. We have previously proposed a hologram view printing method based on the effective perspective picture segmentation and reassembly (EPISM) algorithm CN 107340703A; su, Q.Yuan, Y.Huang, X.Jiang and X.Yan, "Method of single-step full synthetic holographic printing base on active perspective images' segmentation and mosaic," Opti.express 25(19), 23523 and 23544(2017) ], when the Method is adopted, the picture processing mode is simple, the printing of the holographic view can be completed in one step, and the resolution of the reproduced image is greatly improved, but in order to meet the specific visual angle relationship, a transmission type liquid crystal display screen with a larger breadth is required to be used, the light energy utilization rate is not high, and the holographic printing time is longer.
The invention provides an improved original printing system, on one hand, a converging lens is added behind a liquid crystal display screen to regulate and control the propagation direction of light; on the other hand, a holographic scattering film with a proper expansion angle is selected as a scattering medium to replace frosted glass in the original system, so that the divergence of light energy is reduced. The holographic scattering film is a transmission type speckle holographic element, can realize directional scattering of light rays, and is applied to a three-dimensional light field display system [ Z.Yan, X.Yan, X.Jiang, H.Gao, J.Wen ], "Integrated imaging based light field display with enhanced viewing with using a holographic diffuser," opt.Commun.402, 437-441(2017) ], but is not used in a holographic view printing system.
The holographic stereogram printing system combining the convergent lens and the holographic scattering film can effectively improve the energy utilization rate and save the holographic printing time.
Disclosure of Invention
The invention aims to provide a holographic volume view printing system with a converging lens and a holographic scattering film combined for improving the energy utilization rate in the holographic volume view printing process and saving the holographic printing time.
The technical scheme of the invention is as follows:
the original holographic stereogram printing system is improved, on one hand, a convergent lens is added behind a liquid crystal display screen to regulate and control the propagation direction of light; on the other hand, a holographic scattering film with a proper expansion angle is selected as a scattering medium to replace frosted glass in the original system, so that the divergence of light energy is reduced. The holographic recording medium is arranged at the back focal plane of the convergent lens, when non-parallel light carrying object light information enters the liquid crystal display, the holographic scattering film and the convergent lens are arranged in a close fit manner, and the holographic scattering film with an expansion angle of 10 degrees is preferred.
Drawings
Examples figures:
there are 5 drawings of the holographic stereogram printing system in which the converging lens of the present invention is used in conjunction with a holographic diffuser film.
FIG. 1 is a schematic diagram of the divergence range of an object beam.
FIG. 2 is a holographic volume view printing system optical path diagram.
FIG. 3 is a diagram of the light field intensity profile at the back focal plane of a converging lens.
FIG. 4 shows the optical reconstruction of a three-dimensional scene using different combinations for holographic volume-view printing.
FIG. 5 is a multi-angle reconstructed image of a three-dimensional scene using a holographic diffuser film with an expansion angle of 10 in combination with a converging lens.
In fig. 1 to 5, (1) -a converging lens, (2) -a holographic scattering film, (3) -a liquid crystal display screen, (4) -a holographic recording medium, (5) -a diaphragm, (6) -a laser light source, (7) -a shutter, (8) -a first half wave plate, (9) -a polarization splitting prism, (10) -a second half wave plate, (11) -a reflector, (12) -a beam expanding lens, (13) -a spatial filter, and (14) -a collimating lens.
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of a "holographic volume-view printing system using a condensing lens in combination with a holographic diffuser film" according to the present invention will be described in further detail with reference to the accompanying drawings.
Fig. 1 is a schematic view of the divergence range of the object beam provided by the present invention. The EPISM algorithm-based holographic volume view printing system is improved, and the holographic scattering film (2) is used as a scattering medium to replace ground glass in the original system. The holographic scattering film (2) is tightly attached to the liquid crystal display screen (3), the diffuse reflection effect of the holographic scattering film (2) is utilized to fully disperse the object light beam passing through the liquid crystal display screen (3) to the holographic recording medium (4), and the diaphragm (5) is tightly attached to the holographic recording medium (4). When the expansion angle of the holographic scattering film (2) is large, a lot of light will be scattered out of the holographic unit, and the energy is wasted, such as the energy effective area and the energy loss area shown in fig. 1(a), we propose to place a converging lens (1) behind the holographic scattering film (2) to reduce the divergence range of the light energy, as shown in fig. 1 (b).
FIG. 2 is an optical path diagram of a holographic stereogram printing system provided by the present invention. The laser light source (6) is divided into two paths of light beams with mutually vertical polarization directions after passing through a shutter (7), a first half-wave plate (8) and a polarization beam splitter prism (9), one path of light beam is used as an object light beam, the other path of light beam is used as a reference light beam, and the energy intensity ratio of the two paths of light beams is adjusted through the first half-wave plate (8). The reference light beam sequentially passes through a second half-wave plate (10), a reflector (11), a spatial filter (13), a collimating lens (14) and a diaphragm (5) and then enters the holographic recording medium (4) at an angle of about 45 degrees, the second half-wave plate (10) is used for adjusting the polarization direction of the reference light beam to ensure that the reference light beam is consistent with the object light beam, and the spatial filter (13) is combined with the collimating lens (14) for use to obtain plane waves with single spatial frequency. The object light beams sequentially pass through the beam expanding lens (12), the liquid crystal display screen (3), the holographic scattering film (2), the converging lens (1) and the diaphragm (5) and then irradiate the holographic recording medium (4), and the object light beams and the reference light beams are mutually interfered at the holographic unit to obtain holographic fringes. According to the EPISM algorithm principle, the liquid crystal display (3) and the holographic scattering film (2) are placed in close contact, and the synthesized visual angle picture is derived from an observation point at the central position of the holographic unit, so that a specific visual angle relation must be met between the liquid crystal display (3) and the holographic unit, namely the holographic unit should be positioned on the focal plane of the convergent lens (1). Meanwhile, the liquid crystal display screen (3) is irradiated by non-parallel light, and the converging lens (1) is required to be placed close to the holographic scattering film (2), so that accurate visual angle pictures can be directly observed during holographic body view reproduction.
FIG. 3 is a diagram of the intensity distribution of the light field at the back focal plane of the converging lens provided by the present invention. By using
The holographic scattering film (2) with three different expansion angles of 5 degrees and 10 degrees is used as a scattering medium to shoot the intensity distribution of an optical field at the back focal plane of the convergent lens (1). When the holographic scattering film (2) is not provided, a multi-stage discretization bright spot is generated at the rear focal plane of the convergent lens (1); when the holographic scattering film (2) with the spread angle of 2 degrees is adopted, the multi-stage discretized bright spots are not obvious any more, but the uneven light field intensity distribution is still obvious; when the holographic scattering film (2) with the spread angle of 5 degrees is adopted, the intensity distribution of the light field becomes more uniform, but the difference in intensity can be still clearly observed; when the holographic scattering film (2) with the spread angle of 10 degrees is adopted, the light field distribution is uniform and continuous, and the difference in intensity is not obvious any more.
FIG. 4 is an optical representation of a dimensional scene printed with holographic volume views in different combinations according to the present invention. Six-group comparative experiments were designed: the method is characterized in that the method comprises the following steps of using only a converging lens (1), using only ground glass as a scattering medium, using the ground glass in combination with the converging lens (1), using a holographic scattering film (2) with an expansion angle of 2 degrees in combination with the converging lens (1), using the holographic scattering film (2) with an expansion angle of 5 degrees in combination with the converging lens (1), and using the holographic scattering film (2) with an expansion angle of 10 degrees in combination with the converging lens (1), and performing holographic view printing by respectively adopting a holographic view printing method based on an EPISM algorithm, wherein the holographic view printing is performed, the holographic cell size is 1cm, 8 × 8 ═ 64 holographic cells are printed in total, and each group of experimental parameters is shown in the following table:
when a hologram view is reproduced by printing only with a condensing lens (1), each of the light spots is seen as a discretized light spot through each hologram cell, and a reproduced image of a three-dimensional scene is annihilated in a strong background. When the holographic scattering film (2) with the spread angle of 2 degrees is used in combination with the condensing lens (1), a reproduced image of a three-dimensional scene can be observed, but a group of extremely bright light spots exist, and the observation effect is seriously influenced. When the holographic scattering film (2) with the expansion angle of 5 degrees is used in combination with the converging lens (1), the reproduction effect of the three-dimensional scene is better than that when the holographic scattering film (2) with the expansion angle of 2 degrees is used in combination with the converging lens (1), but the reproduced image is still shielded by background light to a certain degree, and the observation effect is not ideal. In fig. 4(d) and 4(e), since the reproduced three-dimensional scene is blocked by strong background light, when the three-dimensional scene is focused for photographing, the rasterization structure between the holographic units is blurred but is enough to be observed. When only ground glass is used, or the ground glass is used in combination with the converging lens (1), or the holographic scattering film (2) with the expansion angle of 10 degrees is used in combination with the converging lens (1), a good holographic volume view reconstruction effect can be obtained, and when the holographic scattering film (2) with the expansion angle of 10 degrees is used in combination with the converging lens (1), the object light energy can be greatly improved. When the ratio of the object light energy to the reference light energy is kept unchanged, the holographic scattering film (2) with the expansion angle of 10 degrees is combined with the converging lens (1) to be used, so that the printing efficiency can be effectively improved, the printing time is saved, and particularly, the holographic view is aimed at a holographic view with a larger breadth.
FIG. 5 is a multi-angle reconstructed image of a three-dimensional scene when the holographic diffuser film with an extended angle of 10 ° provided by the present invention is used in combination with a condensing lens. The reproduced image is clear and has good effect.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (3)
1. A convergent lens and holographic scattering film combined holographic stereogram printing system is characterized in that the system simultaneously uses a convergent lens (1) and a holographic scattering film (2), the holographic scattering film (2) is used as a scattering medium, and an object light beam transmitted by a liquid crystal display screen (3) sequentially passes through the holographic scattering film (2) and the holographic scattering film (1) and then reaches a holographic recording medium (4); the non-parallel light carrying object light information is transmitted through the liquid crystal display screen (3), and the liquid crystal display screen (3), the holographic scattering film (2) and the convergent lens (1) are placed in a close fit manner.
2. The holographic stereovision printing system in which a condensing lens is used in combination with a holographic diffuser film as claimed in claim 1, wherein said holographic diffuser film (2) acts as a scattering medium, and an expansion angle of said holographic diffuser film (2) is 10 °.
3. The holographic stereovision printing system in which a converging lens is used in combination with a holographic diffuser film as claimed in claim 1, wherein said holographic recording medium (4) is to be placed at the back focal plane of said converging lens (1).
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| CN109283823B (en) * | 2018-11-22 | 2020-12-25 | 中国人民解放军陆军装甲兵学院 | Holographic volume view acquisition method and system |
| CN110244469B (en) * | 2019-06-19 | 2021-03-23 | 中国人民解放军陆军装甲兵学院 | Method and system for determining position and diffusion angle of directional diffuser |
| CN112255787B (en) * | 2020-10-23 | 2022-06-07 | 中国人民解放军陆军装甲兵学院 | Depth of field extension method and system of integrated imaging display system |
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| US3889226A (en) * | 1971-07-28 | 1975-06-10 | Battelle Development Corp | Scanned holography by sector scanning |
| JP4501228B2 (en) * | 2000-05-29 | 2010-07-14 | ソニー株式会社 | Hologram printing system and holographic stereogram |
| US20040023122A1 (en) * | 2002-08-01 | 2004-02-05 | Felder Thomas C. | Optical element resistant to pressure-induced defects |
| CN202351610U (en) * | 2011-11-18 | 2012-07-25 | 四川红洋广告有限公司 | Holographic imaging system |
| KR102067762B1 (en) * | 2013-03-20 | 2020-02-11 | 삼성전자주식회사 | Method and apparatus for holographic recording |
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