CN104698802A - Large-size calculation holographic representation method - Google Patents
Large-size calculation holographic representation method Download PDFInfo
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- CN104698802A CN104698802A CN201510127353.2A CN201510127353A CN104698802A CN 104698802 A CN104698802 A CN 104698802A CN 201510127353 A CN201510127353 A CN 201510127353A CN 104698802 A CN104698802 A CN 104698802A
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Abstract
The invention provides a large-size calculation holographic representation method. The large-size calculation holographic representation method comprises a method of loading a disperse phase grating in a phase hologram and a space division multiplexing method. The large-size calculation holographic representation method comprises the following steps of dividing a selected picture into four sub-pictures by using the space division multiplexing method; loading the phase of the disperse phase grating in a hologram in a process of making the phase hologram so as to realize movement of representation images; dividing a space light modulator (SLM) into four portions; and respectively loading phase holograms of the corresponding sub-pictures on the four portions. In an optical representation process, change of the disperse phase grating loaded in the holograms of corresponding scenes is controlled through a computer, positions of the four representation images are adjusted, and the four representation images are spliced seamlessly, so that calculation large-size representation is implemented.
Description
Technical field
The present invention relates to calculation holographic display technique, more particularly, the present invention relates to a kind of large scale calculation holographic display technique.
Background technology
Holographic display is a kind of true three-dimension display technlolgies, and beholder can watch stereo-picture when not wearing and helping glasses.Along with developing rapidly of computer technology, people use computer mould to fit the various two-phonon process of process widely, and derive calculation holographic display technique.Along with the lifting of computing power and the development of photoelectric device, the advantage shown based on the calculation holographic of spatial light modulator (SLM) is further outstanding, for holography brings very large development space, hologram is mainly loaded on SLM by it, to replace the chemical record dry plate in traditional optical holography, thus avoid the holographic rigors to light path and experimental situation of traditional optical.Meanwhile, due to SLM can be real-time erasing and write, therefore can realize real-time reproduction.But by the restriction of existing space photomodulator self structure, calculation holographic reproduction image small-sized, cannot meet the actual demand of people.
Reproduce to obtain the simple large scale calculation holographic of system, domestic and international researchist has carried out a series of research.They are made hologram after splitting by scene that the Kenji Yamamoto of Japan and cooperation team thereof propose to reproduce respectively, are then loaded on corresponding SLM, use multiple SLM array joining method to realize the display of calculation holographic large scale.But within the system in order to realize the seamless spliced of reproduction image, introducing lens arra and special large lens, adding complexity and the operation easier of system.The Tomoyoshi Shimobaba of Chiba, Japan university etc. propose to realize calculation holographic by the sample interval changing former figure and reproduce the expansion resembling size.Although the method system is simple, be easy to realize, but the method does not expand in fact the size of whole reproduction image, just the marginal information of former figure is lost the expansion information of needs being carried out local, the reproduction image size after its local wide and the reproduction image of former figure measure-alike.
Summary of the invention
The present invention proposes a kind of large scale calculation holographic reproducting method, the method by spatial division multiplexing usage and load in phase hologram discrete phase grating combine achieve large scale calculation holographic display.
Spatial division multiplexing usage is respectively at width length and width
xwith
ypicture process in MATLAB, obtain size and be respectively
four width sub-pictures as shown in Figure 1, then by bilinear interpolation by their pixel respectively interpolation itself and slm pixel are matched; Utilize Fourier's process of iteration to be processed respectively by this four width figure, obtain four width holograms; Then four width holograms are synthesized the new hologram of a width, be loaded on SLM, with regard to being equivalent to, the effective coverage of SLM is divided into four parts like this, each region loads corresponding hologram respectively, and through optical reproduction, these four regions will obtain respective reproduction image.
The size of calculation holographic reproduction image
hwith the focal length of imaging len
f, light source wavelength
λand slm pixel size
pmeet:
h =
f λ∕
p (1)
Can see for same light path, namely
f,
λ,
pidentical light path is all identical for the size of the reproduction image of any picture, and therefore, known four width sub-pictures are all identical with the size of the reproduction image of former figure.
In order to allow tetrameric reproduction image be stitched together, in the process generating phase hologram, add suitable discrete phase grating, hologram generation step as shown in Figure 2.In optical reproduction process, reproduce light path as shown in Figure 3, controlled the change of the discrete phase grating be loaded in the hologram of corresponding scene by computing machine, regulate the position of four reproduction image, realize the seamless spliced of reproduction image, thus obtain the reproduction of calculation holographic large scale.
Preferably, as shown in Figure 4, it has the function of phase-modulation to the structure of discrete phase grating, generally with 2
πfor the cycle carries out phase-modulation to light wave, thus change the diffraction direction of light, the position of reproduction image is offset.Loading discrete phase raster method is in the hologram exactly the phase modulation factor adding discrete phase grating in phase type hologram, by changing its phase modulation factor, change the exit direction of light, the position of calculation holographic reproduction image can be moved freely in reproduction regions.
Particularly, the phase place of discrete phase grating can be expressed as:
φ g = mod(
bm+cn,
T )
×(2
π/
T ) (2)
In formula, mod represents modulo operation,
trepresent the cycle of grating,
m,
nthe transverse and longitudinal scope of grating respectively,
b,
crepresent respectively and be loaded into
mwith
ngrating on direction.Get different
bwith
cvalue can obtain the grating of different directions, gets different
tvalue can not be shared the same light the grating of deflection angle.Can see, light is by being equivalent to after grating carry out linear phase compensation to light.When computer code, the PHASE DISTRIBUTION of grating is loaded in the phase type hologram of object, by programmed control, namely changes
b,
c,
tsize, make reproduction image be displaced to specific position.The phase place making iterative Fourier transform algorithm produce object is
φ, then the phase place be finally loaded on SLM should be:
φ new = mod(
φ+φ g , 2
π) (3)
Accompanying drawing explanation
Accompanying drawing 1 is four sub-pictures after the picture that is recorded and segmentation.
Accompanying drawing 2 is the Making programme figure of hologram of the present invention.
Accompanying drawing 3 is structural representation of the present invention.
Accompanying drawing 4 is the structural representation of discrete phase grating.
Accompanying drawing 5 is the reproduction image of former figure.
The reproduction image that accompanying drawing 6 obtains for the present invention.
Shown by reference numeral in above-mentioned accompanying drawing is:
1 laser instrument, 2 wave filters, 3 collimation lenses, 4 spatial light modulators, 5 fourier lenses, 6 receiving screens, 7 computing machines.
Should be appreciated that above-mentioned accompanying drawing just schematically, do not draw in proportion.
Embodiment
The following detailed description of the specific embodiments of a kind of large scale calculation holographic reproducting method that the present invention proposes, the present invention is conducted further description.What be necessary to herein means out is; following examples are only described further for the present invention; limiting the scope of the invention can not be interpreted as; this art skilled person makes some nonessential improvement and adjustment according to foregoing invention content to the present invention, still belongs to protection scope of the present invention.
In the implementation case, adopt wavelength be the green laser of 532nm, wave filter be positioned at laser instrument after 100mm place playback light emergent light axis on, collimation lens is positioned at wave filter 300mm place, SLM be positioned at collimation lens after 500mm place, the distance between imaging len and SLM is 150mm place; Adopt Fourier imaging len to be imaging len in the present invention, receiving screen be positioned at Fourier's imaging len after 500mm place.Wherein SLM adopts reflective phase-type SLM, and its resolution is 1920
×1080, pixel size is 8 μm of effective coverage sizes is 8.64
mm ×15.36
mm; The focal length of Fourier's imaging len is 500mm.Image source used is 512
×the gray-scale map of 512 pixels.
Be 1920 with bilinear interpolation by its interpolation by picture after sample is discrete in this example
×1080 sizes; Carrying out Fourier's iteration afterwards and obtain its phase place, in order to reduce the speckle noise of reproduction image in the implementation case, iterations being located 50 times; Then in the phase place obtained, add the phase place of discrete phase grating; Be encoded into computed hologram again; Then the hologram of four width sub-pictures is synthesized the new hologram of a width.
In this example, the effective coverage of SLM is divided into four parts, the size of every part is then 4.32
mm ×7.68
mm, then the hologram of four width sub-pictures is loaded on the corresponding region of SLM respectively.The green light source sent from laser instrument becomes collimated light by wave filter and collimation lens, is then irradiated to the incident angle of 3 ° and is loaded with on the reflective SLM of hologram, image on its focal plane after fourier lense.
In order to allow four reproduction image realize seamless spliced, for the coefficient of discrete phase grating added by the figure being loaded into the former figure upper left corner be
b=1,
c=1,
t=6; For the upper right corner figure added by the coefficient of discrete phase grating be
b=-1,
c=1,
t=6; For the lower left corner figure added by the coefficient of discrete phase grating be
b=-1,
c=-1,
t=6; For the lower right corner figure added by the coefficient of discrete phase grating be
b=1,
c=-1,
t=6.Finally make four reproduction image adjacent regularly, obtain seamless spliced large scale calculation holographic reproduction image.Accompanying drawing 5 and accompanying drawing 6 are the reproduction image that the reproduction image of former figure and the present invention obtain respectively, can find out that result of the present invention expands four times than the result of former figure reproduction image.
Claims (3)
1. a large scale calculation holographic reproducting method, is characterized in that, the method is by spatial division multiplexing usage and in phase hologram, load discrete phase grating combine, and achieves the display of large scale calculation holographic.
2. large scale calculation holographic reproducting method according to claim 1, is characterized in that, utilize spatial division multiplexing usage one width length and width are respectively into
xwith
ypicture process in MATLAB, obtain size and be respectively
four width sub-pictures, then by bilinear interpolation by their pixel respectively interpolation itself and slm pixel are matched; Utilize Fourier's process of iteration to be processed respectively by this four width figure, obtain four width holograms; Then four width holograms are synthesized the new hologram of a width, be loaded in spatial light modulator (SLM), with regard to being equivalent to, the effective coverage of SLM is divided into four parts like this, each region loads corresponding hologram respectively, through optical reproduction, these four regions will obtain respective reproduction image, and its size is all identical with the size of former figure reproduction image, then the holographic reconstructed image through four sub-pictures splices, and just obtains large-sized reproduction image.
3. large scale calculation holographic reproducting method according to claim 1, it is characterized in that, discrete phase grating has the function of phase-modulation, the diffraction direction of light can be changed, so load discrete phase grating in phase type hologram, changing the exit direction of light, by changing the discrete phase grating be loaded in phase type hologram, the position of calculation holographic reproduction image can be moved freely in reproduction regions; Discrete phase grating is generally with 2
πfor the cycle carries out phase-modulation to light wave, its phase place can be expressed as
φ g =mod (
bm+cn,
t) × (2
π/
t), in formula, mod represents modulo operation,
trepresent the cycle of grating,
m,
nthe transverse and longitudinal scope of grating,
b,
crepresent respectively and be loaded into
mwith
ngrating on direction; Get different
bwith
cvalue can obtain the grating of different directions, gets different
value can not be shared the same light the grating of deflection angle, can see that light is by being equivalent to after grating carry out linear phase compensation to light; When computer code, the PHASE DISTRIBUTION of grating is loaded in the phase type hologram of object, makes reproduction image be displaced to specific position by programmed control; The phase place making iterative Fourier transform algorithm produce object is
φ, then the phase place be finally loaded on SLM should be
φ new =mod (
φ+φ g , 2
π).
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105204312A (en) * | 2015-10-10 | 2015-12-30 | 四川大学 | Holographic projection system based on digital cylindrical lens |
| CN105204313A (en) * | 2015-08-16 | 2015-12-30 | 四川大学 | Optical zooming system and method based on programmable orthogonal close-contact column lens |
| CN105892258B (en) * | 2016-06-08 | 2018-05-18 | 四川大学 | It is a kind of to reduce the computed hologram generation method for reproducing waste information |
| CN110058333A (en) * | 2019-05-07 | 2019-07-26 | 北京航空航天大学 | A kind of big visual angle holographic display system based on high focal power liquid lens |
| CN110083042A (en) * | 2019-05-07 | 2019-08-02 | 北京航空航天大学 | A kind of large scale holography display methods based on the effective use of two spaces optical modulator |
| CN113448234A (en) * | 2021-07-19 | 2021-09-28 | 北京航空航天大学 | Holographic 3D display system based on virtual array splicing of spatial light modulator |
| CN114967398A (en) * | 2022-05-13 | 2022-08-30 | 安徽大学 | Large-size two-dimensional calculation hologram real-time generation method based on deep learning |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1949166A (en) * | 2006-11-09 | 2007-04-18 | 上海大学 | Free multi visul point polyprojecting 3D displaying system and method |
| WO2008025664A2 (en) * | 2006-09-01 | 2008-03-06 | Seereal Technologies S.A. | Holographic projection system using micro-mirrors for light modulation |
| CN101452581A (en) * | 2008-12-30 | 2009-06-10 | 暨南大学 | Rapid generation method for calculating holographic cartoon |
| CN103955127A (en) * | 2014-04-17 | 2014-07-30 | 中国人民解放军装甲兵工程学院 | Phase modulation full-parallax holographic stereogram implementation method |
-
2015
- 2015-03-24 CN CN201510127353.2A patent/CN104698802A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008025664A2 (en) * | 2006-09-01 | 2008-03-06 | Seereal Technologies S.A. | Holographic projection system using micro-mirrors for light modulation |
| CN1949166A (en) * | 2006-11-09 | 2007-04-18 | 上海大学 | Free multi visul point polyprojecting 3D displaying system and method |
| CN101452581A (en) * | 2008-12-30 | 2009-06-10 | 暨南大学 | Rapid generation method for calculating holographic cartoon |
| CN103955127A (en) * | 2014-04-17 | 2014-07-30 | 中国人民解放军装甲兵工程学院 | Phase modulation full-parallax holographic stereogram implementation method |
Non-Patent Citations (1)
| Title |
|---|
| 李芳转等: "基于空分复用的大尺寸全息再现方法", 《2014中国平板显示学术会议论文集》 * |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105204313A (en) * | 2015-08-16 | 2015-12-30 | 四川大学 | Optical zooming system and method based on programmable orthogonal close-contact column lens |
| CN105204313B (en) * | 2015-08-16 | 2018-07-17 | 四川大学 | A kind of optical focal distance setting system and Zooming method based on programmable orthogonal contiguity cylindrical lens |
| CN105204312A (en) * | 2015-10-10 | 2015-12-30 | 四川大学 | Holographic projection system based on digital cylindrical lens |
| CN105204312B (en) * | 2015-10-10 | 2018-05-08 | 四川大学 | A kind of holographic projection system based on digital cylindrical lens |
| CN105892258B (en) * | 2016-06-08 | 2018-05-18 | 四川大学 | It is a kind of to reduce the computed hologram generation method for reproducing waste information |
| CN110083042A (en) * | 2019-05-07 | 2019-08-02 | 北京航空航天大学 | A kind of large scale holography display methods based on the effective use of two spaces optical modulator |
| CN110058333A (en) * | 2019-05-07 | 2019-07-26 | 北京航空航天大学 | A kind of big visual angle holographic display system based on high focal power liquid lens |
| CN110083042B (en) * | 2019-05-07 | 2020-02-11 | 北京航空航天大学 | Large-size holographic display method based on effective utilization of two spatial light modulators |
| CN113448234A (en) * | 2021-07-19 | 2021-09-28 | 北京航空航天大学 | Holographic 3D display system based on virtual array splicing of spatial light modulator |
| CN113448234B (en) * | 2021-07-19 | 2022-05-17 | 北京航空航天大学 | Holographic 3D display system based on virtual array splicing of spatial light modulator |
| WO2023000394A1 (en) * | 2021-07-19 | 2023-01-26 | 北京航空航天大学 | Holographic 3d display system based on spatial light modulator virtual array splicing |
| CN114967398A (en) * | 2022-05-13 | 2022-08-30 | 安徽大学 | Large-size two-dimensional calculation hologram real-time generation method based on deep learning |
| CN114967398B (en) * | 2022-05-13 | 2024-05-31 | 安徽大学 | Large-size two-dimensional calculation hologram real-time generation method based on deep learning |
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Application publication date: 20150610 |