CN103425034A - Real-time holographic projection system based on conjugate continuation - Google Patents
Real-time holographic projection system based on conjugate continuation Download PDFInfo
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Abstract
The invention belongs to the technical field of holographic projection display and particularly relates to a real-time holographic projection system based on conjugate continuation. The real-time holographic projection system comprises a target, a conjugate imaging system, a Fourier optical system, a CCD camera, a computer, a laser light source, a spatial light modulator and a projection screen. The conjugate imaging system acquires a conjugate image of the target, fast calculation of a holographic image is achieved by using a holographic image acquisition system through single Fourier transform, the holographic image is loaded in the spatial light modulator, and the laser light source is used to irradiate the holographic image to realize holographic projection display of the target. By the holographic projection system, all information of the target can be transformed to the holographic image, acquisition speed of the holographic image is increased greatly, real-time holographic projection display is achieved, and the defects that the existing holographic projection display systems are slow in calculation, incapable of real-time projection, large in information loss, and the like are overcome.
Description
Technical field
The invention belongs to holographic and projection display technique field, be specifically related to a kind of holographic projection system that can realize target thing holographic real-time Projection Display.
Background technology
Along with the fast development of laser technology and holographic technique, the holographic every field that has been deep into social life that shows.Holographic projection system is utilized the Ear Mucosa Treated by He Ne Laser Irradiation hologram, obtains the true reappearance of target.Optical projection system with respect to traditional single pixel to single pixel, the holographic laser projection utilizes all pixels on hologram to be reproduced each point on reproduction face, its reproduced image is bright in luster, contrast is high, and has the plurality of advantages such as information redundancy, fault-tolerance ability be strong.The line holographic projections technology can be widely used in the public arenas such as stage, movie theatre, advertisement, fair, and alternative any existing display device, have very strong appeal and effect unique, and business potential is huge.Simultaneously, holographic projection system has wide application potential equally in following national defense and military fields.
The key problem of holographic projection system is the holographic map generalization of object.At present, the technology of obtaining of hologram mainly comprises following several: a kind of is the method for utilizing optical holography, adopts object light ripple and reference light wave to form interference fringe on holographic material and obtains hologram.The method preparation process is loaded down with trivial details, to the environmental requirement harshness, and can't record dummy object or large scene image.A kind of is to adopt the calculation holographic theory, and object is considered as to self-luminous body, and the simulation object plane obtains digital hologram to diffraction and the interventional procedures of holographic facet; Perhaps adopt optimized algorithm, by the repeatedly Fourier transform between holographic facet and reproduction face and the iterative operation of inverse transformation thereof, the position that obtains holographic facet distributes mutually as hologram.Because the data volume that hologram comprises is very big, the data that the full parallax hologram that utilizes the hand size that optical holography makes contains nearly 1,000 hundred million bits, this computing velocity to hologram has proposed great challenge.Therefore, the real-time of object line holographic projections is a bottleneck problem of this technology application of puzzlement.
At present, domestic for the holographic real-time optical projection system still in the theoretical and experimental study stage, there is no engineering application.In view of the situation, the invention provides a kind of holographic real-time optical projection system based on the conjugation continuation, utilize photometry calculation method greatly to improve the acquisition speed of hologram, realized the holographic real-time Projection Display of object.
Summary of the invention
The purpose of this invention is to provide a kind of holographic projection system that can reproduce in real time object.Gordian technique is object is carried out to the conjugation continuation by the mode of optical system or computer digit processing, according to the Fourier transform of conjugation continuation image, be the character of real-valued function, obtain the digital hologram of object by fourier optical system or digital Fourier transform, be loaded in spatial light modulator, be diffracted in real time the line holographic projections image of object under the irradiation of LASER Light Source.
The invention is characterized in that a kind of holographic real-time optical projection system based on the conjugation continuation at least contains: object, conjugate imaging system, conjugation continuation image, Fourier transform lens, ccd video camera, digital hologram, computing machine, LASER Light Source, colimated light system, spatial light modulator, projection screen.Wherein, by Fourier transform lens, ccd video camera and calculation mechanism, become hologram to obtain system, formed the projection playback system of digital hologram by LASER Light Source, colimated light system, spatial light modulator and projection screen.
Adopt the real-time projection reproduction step of realize target thing of the present invention to be: by the conjugate imaging system, object to be carried out the conjugation continuation of level or vertical direction, the fourier optical system that fourier transform lens forms is to its optical imagery, and ccd video camera is taken imaging results as digital hologram.Or, by ccd video camera photographic subjects object image, computing machine is to its digital conjugation continuation and carry out fast fourier transform (FFT), the real part of getting transformation results forms digital hologram.Digital hologram is loaded in spatial light modulator, and LASER Light Source, after the colimated light system collimation, has been loaded the spatial light modulator modulation of digital hologram, reproduces in real time object on projection screen.
Described conjugate imaging system can be by spectroscope, the girdle prism such as trapezoidal, roof prism, dive and hope prism or isosceles right-angle prism, dive and hope the optical system that prism forms, and can be also the digital image processing system consisted of ccd video camera and computing machine.Wherein, by spectroscope, the girdle prism such as trapezoidal, roof prism and the vertical image rotation of hoping prism form of diving move the picture system and realize the vertical direction conjugation continuation to object, by isosceles right-angle prism, the horizontal image rotation of hoping prism form of diving moves the horizontal direction conjugation continuation to object as the system realization.
Described hologram obtains the system employing conjugation continuation image is carried out to the single Fourier transform, and transformation results is real number matrix, and this real number matrix is the hologram of object.The fourier optical system that the single Fourier transform of conjugation continuation image forms by Fourier transform lens is realized, when adopting calculation holographic, carries out fast fourier transform (FFT) by computing machine and realizes.
All amplitudes and phase information that described digital hologram has comprised object, can be phase type hologram, can be also amplitude type hologram.Simultaneously, described digital hologram has superposability, and by the digital addition of different target thing hologram, when can realize a plurality of object, projection is reproduced.
Described spatial light modulator can be transmission-type, can be also reflection-type, and modulating mode is which amplitude modulation or phase-modulation.
Compared with prior art, holographic projection system provided by the invention has the following advantages:
1, the Fourier transform due to conjugation continuation image is real-valued function, has comprised all information of object using this real-valued function as hologram, has only avoided amplitude or the information loss using phase place as hologram only, and the reproduction quality of hologram is higher.
2, by single Fourier transform computed hologram, avoid the repeatedly time loss of Fourier transform in common hologram computing method, improved the counting yield of hologram.Wherein, the photometry calculation method of employing Fourier transform lens has more greatly improved the computing velocity of hologram, has realized that the real-time projection of object is reproduced.
The accompanying drawing explanation
The accompanying drawing that the present invention is based on the holographic real-time optical projection system of conjugation continuation has 3.
The structural representation of holographic real-time optical projection system first embodiment of Fig. 1 based on the conjugation continuation.
The structural representation of holographic real-time optical projection system second embodiment of Fig. 2 based on the conjugation continuation.
The structural representation of holographic real-time optical projection system three embodiment of Fig. 3 based on the conjugation continuation.
In Fig. 1～Fig. 3, (1)-object, (2)-conjugate imaging system, (3)-conjugation continuation image, (4)-fourier transform lens, (5)-ccd video camera, (6)-digital hologram, (7)-computing machine, (8)-LASER Light Source, (9)-colimated light system, (10)-spatial light modulator, (11)-projection screen, (12)-spectroscope, (13)-trapezoidal girdle prism that waits, (14)-roof prism, (15)-dive and hope prism, (16)-isosceles right-angle prism, (17)-isosceles right-angle prism, (18)-dive and hope prism, (19) digital picture of-object.
Embodiment
Below in conjunction with accompanying drawing and example, the present invention's " a kind of holographic real-time optical projection system based on the conjugation continuation " is described further.
First embodiment that Fig. 1 is holographic projection system provided by the invention, comprise object (1), conjugate imaging system (2), conjugation continuation image (3), Fourier transform lens (4), ccd video camera (5), digital hologram (6), computing machine (7), LASER Light Source (8), colimated light system (9), spatial light modulator (10), projection screen (11), spectroscope (12), the trapezoidal girdle prism (13) that waits, roof prism (14), dive and hope prism (15).
In this embodiment, object is a width two-dimensional image, and conjugation continuation image (3) is by spectroscope (12), the girdle prism (13) such as trapezoidal, roof prism (14) and dive that imaging forms the conjugate imaging system (2) of hoping prism (15) form to object (1).Two-dimensional image is considered as to self-luminous body, its light sent after spectroscope (12), one group of light transmission direct imaging; Another group light by trapezoidal wait girdle prism (13), roof prism (14) and dive and hope prism (15) reflection after, the vertical conjugated image of formation object, two width image sets are synthesized conjugation continuation image (3).In this example, hologram obtains the fourier optical system of system for consisting of Fourier transform lens (4), and digital hologram (6) carries out the Fourier transform generation by fourier optical system to conjugation continuation image (3).Ccd video camera (5) is placed on the focal plane of Fourier transform lens (4), and computing machine (7) can obtain digital hologram (6) by ccd video camera (5).If conjugation continuation image (3) is f (x, y), due to its Central Symmetry image that is the conjugation continuation, have
f(x，y)＝f
*(x，y) (1)
f(x，y)＝f(-x，-y)(2)
Wherein * is conjugate operation.Make its Fourier transform be
Operator wherein
For Fourier transformation operation, u, v is spatial frequency.According to the character of Fourier transform, have
Therefore have
F(u，V)＝F(-u，-V)＝F
*(-u，-V) (6)
Make F (u, V)=a (u, V)+ib (u, v) (7)
Wherein i is imaginary unit, the real part that a (u, v) is F (u, v), the imaginary part that b (u, v) is F (u, v).{。##.##1},
a(u，v)+ib(u，v)＝a(-u，-v)+ib(-u，-v)＝a(-u，-v)-ib(-u，-v) (8)
If above formula is set up, and if only if
ib(u，v)＝-ib(u，v) (9)
So b (u, v)=0, the imaginary part of F (u, v) is 0, therefore the real-valued function of symmetry centered by the Fourier transform F (u, v) of conjugation continuation image f (x, y).
According to this character, get the real-valued function of conjugation continuation image (3) Fourier transform as digital hologram (6), all information of object can be included in hologram.Digital hologram (6) is loaded in spatial light modulator (10), spatial light modulator can be various spatial light modulators, as transmission-type or reflective, phase modulation-type or which amplitude modulation type, select the example of the phase type spatial light modulator of transmission-type as a convenient explanation of the present invention here.By colimated light system (9), the laser that LASER Light Source (8) is sent is shaped as directional light, and incides on spatial light modulator (10).Spatial light modulator, owing to having loaded digital hologram, is modulated incident laser, and is being placed in the upper diffraction image that forms object of the projection screen (11) that reproduces image planes, has realized that the line holographic projections of object is reproduced.
Second embodiment that Fig. 2 is the holographic real-time optical projection system based on the conjugation continuation provided by the invention, its concrete structure is similar to first embodiment, and it is identical with the first embodiment of the present invention that it implements principle.But in this embodiment, conjugate imaging system (2) consists of isosceles right-angle prism (16), isosceles right-angle prism (17), the prestige prism (18) of diving.One group of the light that object sends sees through this system direct imaging, another group by isosceles right-angle prism (16), isosceles right-angle prism (17), dive and hope that prism (18) reflect successively after, at the horizontal conjugated image of imaging surface formation object.The direct imaging result of this optical system and horizontal conjugated image form conjugation continuation image (3).
In first and second embodiment of the present invention, the generation of the conjugation continuation image of object, and the Fourier transform of conjugation continuation image calculates, the optical system all consisted of lens completes, realized the photometry calculation of object hologram, greatly improve the computing velocity of hologram, guaranteed the real-time of holographic projection system provided by the invention.
The 3rd embodiment that Fig. 3 is the holographic real-time optical projection system based on the conjugation continuation provided by the invention, it is identical with first and second embodiment that it implements principle, but this system has adopted the method for calculation holographic.Obtain its digital picture (19) by ccd video camera (5) photographic subjects thing (1), by computing machine (7), utilize the method for Digital Image Processing to obtain the conjugation continuation image (3) of object digital picture (19), the method of utilizing Fast Fourier Transform (FFT) (FFT) and getting the real part hologram obtains the computed hologram (6) of object (1), is loaded in spatial light modulator (10).Because the mode with Digital Image Processing obtains computed hologram, its arithmetic speed is lower than first and second embodiment of the present invention, but this embodiment is lower to the requirement of optical system, and the scope of application is more extensive.
Claims (9)
1. the holographic real-time optical projection system based on the conjugation continuation, is characterized in that, at least contains: object (1), conjugate imaging system (2), conjugation continuation image (3), Fourier transform lens (4), ccd video camera (5), digital hologram (6), computing machine (7), LASER Light Source (8), colimated light system (9), spatial light modulator (10), projection screen (11).Conjugate imaging system (2) forms the conjugation continuation image (3) of object (1), the fourier optical system imaging formed through Fourier transform lens (4), take by the ccd video camera (5) be placed on Fourier transform lens (4) focal plane the digital hologram (6) that obtains object, by computing machine (7), write in spatial light modulator (10), the laser that LASER Light Source (8) is sent is after colimated light system (9) collimation, irradiate spatial light modulator (10), project in real time the line holographic projections image of object on projection screen (11).
2. the holographic real-time optical projection system based on the conjugation continuation according to claim 1, is characterized in that, described holographic projection system is reproduced in the holographic real-time projection of the upper realize target thing (1) of projection screen (11).
3. the holographic real-time optical projection system based on the conjugation continuation according to claim 1 and 2, it is characterized in that, obtaining of described digital hologram (6), only need the conjugation continuation image (3) of object (1) to realize by the single Fourier transform, the single Fourier transform results of conjugation continuation image (3) is real function, all amplitudes and the phase information that have comprised digital hologram (6).
4. the holographic real-time optical projection system based on the conjugation continuation according to claim 1 and 2, it is characterized in that, described digital hologram (6) has superposability, be the digital hologram of a plurality of objects by direct addition, when the hologram obtained is realized a plurality of objects on projection screen (11), reproduce.
5. the holographic real-time optical projection system based on the conjugation continuation according to claim 1 and 2, it is characterized in that, described conjugation continuation image (3) is generated by optical imagery object (1) by conjugate imaging system (2), or digital picture (19) the conjugation continuation to object generates by computing machine (7).
6. the holographic real-time optical projection system based on the conjugation continuation according to claim 1 and 2, it is characterized in that, described conjugate imaging system (2) is moved the picture system by spectroscope (12), the girdle prism (13) such as trapezoidal, roof prism (14), the vertical image rotation of conjugation of hoping prism (15) form of diving, or is moved as system by isosceles right-angle prism (16), isosceles right-angle prism (17), the horizontal image rotation of conjugation of hoping prism (18) form of diving.Wherein, be coated with semi-transparent semi-reflecting film on first reflective surface of spectroscope (12) and isosceles right-angle prism (16).
7. holographic real-time, the optical projection system based on the conjugation continuation according to claim 1 and 2, it is characterized in that, the single Fourier transformation computation of described conjugation continuation image (3), the fourier optical system consisted of Fourier transform lens (4) is realized by optical computing, or is realized by digital computation by computing machine (7).
8. the holographic real-time optical projection system based on the conjugation continuation according to claim 1 and 2, it is characterized in that, described spatial light modulator (10) is transmission-type, or the spatial light modulator of reflection-type, modulating mode is which amplitude modulation, or is phase-modulation.
9. the holographic real-time optical projection system based on the conjugation continuation according to claim 1 and 2, is characterized in that, adopting digital hologram claimed in claim 3 (6) can be phase type hologram, can be also amplitude type hologram.
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| CN105607393A (en) * | 2015-12-24 | 2016-05-25 | 中国人民解放军装甲兵工程学院 | Variable-focus projection display system applying phase-type spatial light modulator |
| CN105739281A (en) * | 2016-04-14 | 2016-07-06 | 京东方科技集团股份有限公司 | Image display system and image display method |
| CN105898217A (en) * | 2016-04-14 | 2016-08-24 | 京东方科技集团股份有限公司 | Holographic operation device, control device, holographic operation method, and control method |
| CN106547190A (en) * | 2017-02-09 | 2017-03-29 | 厦门大学 | A kind of holographic real-time display method of 3-D effect |
| CN110471250A (en) * | 2019-09-17 | 2019-11-19 | 荆门市探梦科技有限公司 | Live holographic display system |
| CN111240148A (en) * | 2019-12-27 | 2020-06-05 | 北京航空航天大学 | Holographic real-time acquisition and projection system based on self-adaptive zoom camera |
| WO2023109817A1 (en) * | 2021-12-13 | 2023-06-22 | 华为技术有限公司 | Projection device, vehicle lamp and vehicle |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105607393A (en) * | 2015-12-24 | 2016-05-25 | 中国人民解放军装甲兵工程学院 | Variable-focus projection display system applying phase-type spatial light modulator |
| CN105739281A (en) * | 2016-04-14 | 2016-07-06 | 京东方科技集团股份有限公司 | Image display system and image display method |
| CN105898217A (en) * | 2016-04-14 | 2016-08-24 | 京东方科技集团股份有限公司 | Holographic operation device, control device, holographic operation method, and control method |
| CN105739281B (en) * | 2016-04-14 | 2018-12-21 | 京东方科技集团股份有限公司 | Image display system and image display method |
| CN105898217B (en) * | 2016-04-14 | 2019-08-06 | 京东方科技集团股份有限公司 | Holography operation equipment and control equipment, holographic operating method and control method |
| US10663922B2 (en) | 2016-04-14 | 2020-05-26 | Boe Technology Group Co., Ltd. | Image display system and image display method |
| CN106547190A (en) * | 2017-02-09 | 2017-03-29 | 厦门大学 | A kind of holographic real-time display method of 3-D effect |
| CN110471250A (en) * | 2019-09-17 | 2019-11-19 | 荆门市探梦科技有限公司 | Live holographic display system |
| CN110471250B (en) * | 2019-09-17 | 2024-02-13 | 荆门市探梦科技有限公司 | In-situ holographic display system |
| CN111240148A (en) * | 2019-12-27 | 2020-06-05 | 北京航空航天大学 | Holographic real-time acquisition and projection system based on self-adaptive zoom camera |
| WO2023109817A1 (en) * | 2021-12-13 | 2023-06-22 | 华为技术有限公司 | Projection device, vehicle lamp and vehicle |
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