CN101976031A - Method for optimizing reproduced holographic images of digital micro-mirror - Google Patents
Method for optimizing reproduced holographic images of digital micro-mirror Download PDFInfo
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- CN101976031A CN101976031A CN201010264591.5A CN201010264591A CN101976031A CN 101976031 A CN101976031 A CN 101976031A CN 201010264591 A CN201010264591 A CN 201010264591A CN 101976031 A CN101976031 A CN 101976031A
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Abstract
The invention discloses a method for optimizing reproduced holographic images of a digital micro-mirror. The method comprises the following steps of: acquiring four holographic images by a CMOS record photosensitive element; reducing the four holographic images of CMOS records to be one quarter of the original pixel respectively; then splicing the four reduced holographic images into synthetic aperture holographic images which have the same pixels as those of DMD; and obtaining high-quality reproduced holographic images through the DMD. During synthesizing the aperture holographic images, in order to improve the duty ratio, the holographic images are processed through binaryzation. By using the characteristic that an imaging surface of a lens-less Fourier transform hologram reconstruction image is a plus lens focal plane, the method solves the problem that a holographic imaging surface is generally unfixed; by using the characteristic that the zero-order diffraction is converged nearby the center of the focal plane and the occupied area is greatly reduced, the method reduces the influence caused by the zero-order diffraction on the quality of the reconstruction images; and the method improves the duty ratio by using the synthetic aperture holographic characteristic, and improves the utilization ratio of a DMD micro-mirror, thereby fulfilling the aim of improving the quality of the DMD holographic images by only using a single beam of illuminating light.
Description
Technical field
The present invention relates to a kind of optimization method that utilizes digital micro-mirror and digital hologram to reproduce holographic images in real time.
Background technology
Since TIX in 1987 researchs and develops out digital micro-mirror (Digital Micro-mirror Device, DMD) after, owing to have the resolution higher, wideer responding range and quicker response, signal to noise ratio (S/N ratio) than other spatial light modulator, characteristics such as efficiency of light energy utilization height, operating temperature range are big, polarization irrelevant, therefore DMD is applied to holophotal system soon, but the Reconstructed Image Quality amount is also poor when reproducing holographic images with DMD at present, the factor that influences DMD reproduction holographic images quality is many, mainly contains:
1) as the CCD or the CMOS of digital hologram recording element, its resolution generally will be higher than DMD (being the mirror unit sum that the sum of all pixels of CCD or CMOS is greater than DMD), want packed pixel when reproducing holographic images, sacrifice the resolution of the digital hologram that obtains, cause the Reconstructed Image Quality amount to descend with DMD;
2) the effective photosensitive size of CCD or CMOS is less than the overall dimensions (the effective photosensitive size of COMS probably has only the part of DMD overall dimensions generally speaking) of DMD, if on DMD, keep hologram identical with physical size, waste the most of mirror unit of DMD, dutycycle sharply descends, and causes the Reconstructed Image Quality amount to worsen.Otherwise, if make full use of DMD, the hologram size will be amplified, cause reproducing as dwindling and being unfavorable for observing;
3) each moment of DMD can only show black, a white binary map, use the position isolation technics to produce and make the sensible gray shade scale of observer's eyes, the promptly different holographic images of reproducing constantly are binaryzation holograms of different gray scales, behind diffraction, obtain reproducing picture, they are light intensity vision stack (rather than light field stack) in a frame, because the hologram dutycycle of different gray scales differs greatly, cause the Reconstructed Image Quality amount to descend;
4) any one gray-scale value that is input in each micro mirror unit of DMD constantly all is non-negative, so 0 order diffraction picture (particularly straight saturating part wherein) account for most of input light intensity, and in reproducing picture, occupy large stretch of zone, reproduction is reduced as light intensity, and visually very uncomfortable;
5) owing to the hologram of delivering to the DMD reproduction now generally is the Fresnel hologram, DMD is not easy to design the projection system of DMD back to seeing when causing with DMD reproduction holographic images.
Summary of the invention
It is poor to the objective of the invention is in order to solve at present when reproducing holographic images with DMD the Reconstructed Image Quality amount, particularly Zero-order diffractive occupies bulk zone in reproducing picture, reproduction is reduced as light intensity, and obtain clear reproduction as the time DMD to the distance between the sightingpiston, object is to the distance of recording element when being write down digital hologram, the reference light type, and record, the problem of the influence of playback wavelength ratio, provide a kind of Zero-order diffractive that can reduce well to reproducing the influence of picture, accurately the position of picture is reproduced in control, and the digital micro-mirror of the quality of raising reproduction picture reproduces the optimization method of holographic images.
The technical solution adopted for the present invention to solve the technical problems is:
1) character of the no lens Fourier transform digital hologram of utilization: the imaging surface that lensless Fourier transform hologram reproduces picture is exactly the focal plane of plus lens, with reproduction, recording wavelength, and their ratio is irrelevant, solves the unfixing trouble of bringing to demonstration of common holographic imaging face; On imaging surface, its Zero-order diffractive is focused at by lens near the center of focal plane, and shared zone dwindles greatly, can reduce the influence of Zero-order diffractive to the DMD holographic reconstructed image;
2) character by the synthetic aperture holography: the synthetic aperture hologram can improve dutycycle, improve DMD micro mirror utilization factor, overcome the reduced problem of common holographic reconstructed image, translation lensless Fourier transform hologram in the face of hologram place, can not change the position of holographic reconstructed image, can only just reach the purpose that improves DMD holographic reconstructed image quality with single bundle illumination light.
Based on above 2 points, will not have the holography of lens Fourier transform digital and combine, to improve DMD holographic reconstructed image method for quality with the synthetic aperture method.
Specific practice is: earlier by CMOS recording light photosensitive elements, four width of cloth holograms of gathering, four width of cloth holograms with the CMOS record, narrow down to 1/4th of original pixel respectively, then, hologram after four width of cloth are dwindled is spliced into the synthetic aperture hologram that same pixel is arranged with DMD, obtains high-quality holographic reconstructed image by DMD.
During the synthetic aperture hologram, in order to improve dutycycle, to the hologram binary conversion treatment.
The invention has the beneficial effects as follows: utilize lensless Fourier transform hologram to reproduce the character of the imaging of picture, and the character of synthetic aperture holography, reduce Zero-order diffractive to reproducing the influence of picture, accurately the blur-free imaging position of picture is reproduced in control, can improve the dutycycle of hologram, the blur-free imaging invariant position that can keep the DMD holographic reconstructed image simultaneously, and it is not reduced to reproduce picture, zero order diffracted light can also be limited in the very little zone, reduce Zero-order diffractive to reproducing the influence of holographic images, the quality of DMD holographic reconstructed image is improved.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples.
Fig. 1 is the index path of recorded hologram.
Fig. 2 is the width of cloth in the lensless Fourier transform hologram that writes down.
Fig. 3 is the formation of synthetic aperture hologram and reproduces principle schematic.
Fig. 4 is the index path that reproduces holographic images with DMD and lensless Fourier transform hologram.
Fig. 5 is the Fresnel synthetic aperture holographic images that DMD reproduces.
Fig. 6 is the lensless Fourier transform hologram result and reproduces the holographic images that obtains with DMD.Wherein, Fig. 6 (A) is the lensless Fourier transform hologram (not doing synthetic aperture processing) through amplifying, and Fig. 6 (B) is that this hologram reproduces the holographic images that obtains with DMD; Fig. 6 (C) is the lensless Fourier transform hologram (not doing synthetic aperture processing) that does not amplify, and Fig. 6 (D) is that this hologram reproduces the holographic images that obtains with DMD; Fig. 6 (E) is the lensless Fourier transform hologram that amplifies with not, does the hologram that obtains after the synthetic aperture processing, and Fig. 6 (F) is that this hologram reproduces the holographic images that obtains through DMD.
Among the figure, 1. beam splitter, 2. microcobjective, 3. pinhole filter, 4. collimation lens, 5. total reflective mirror, 6. transparent substance (plastic plate), 7. total reflective mirror, 8. microcobjective, 9. pinhole filter, 10. beam splitter, 11. computing machines, 12.CMOS, 13. plus lens, 14,15,16 and 17 holograms (subhologram) after dwindling, 18. digital micro-mirror (DMD), 19. frosted glass, 20. folded light beams.
Embodiment
Shown in Figure 1 is the recording beam path of no lens Fourier transform digital hologram.Laser beam is divided into two bundles by beam splitter 1, wherein a branch ofly converges and by behind the pinhole filter 3, becomes directional light through collimation lens 4 through microcobjective 2, shines on the transparent substance 6, and transmitted light arrives on the CMOS 12 as thing light by beam splitter 10; Another bundle is through catoptron 7 and microcobjective 8 converges and by behind the pinhole filter 9, shine on the beam splitter 10, arrives on the CMOS 12 as reference light.The distance of hole wave filter 9 along optical axis to beam splitter 10,10 distance equates along optical axis to beam splitter with transparent substance 6, thereby ginseng, thing light are interfered on CMOS 12 and are obtained lensless Fourier transform hologram, CMOS 12 is converted into electric signal, and is transferred to and saves as thing lens Fourier transform digital hologram in the computing machine 11.
Shown in Figure 2 is the no lens Fourier transform digital hologram of record, and it provides material for the formation of synthetic aperture hologram.
Shown in Figure 3 is the formation and the reproduction principle schematic of synthetic aperture hologram.The synthetic aperture hologram that the collimated laser beam irradiation is made up of four measure-alike no lens Fourier transform subholograms 14,15,16 and 17, transmitted light is by plus lens 13 imaging on the frosted glass 19 that is positioned at its focal plane.During the synthetic aperture hologram, in order to improve dutycycle, to the hologram binary conversion treatment.Because the reproduction picture of synthetic aperture hologram can dwindle the size of reproducing speckle in the picture, signal to noise ratio (S/N ratio), resolution are improved simultaneously, so the reproduction that obtains is better than the single width subhologram as effect.
Shown in Figure 4 is the index path that reproduces holographic images with DMD and lensless Fourier transform hologram.Laser beam enters microcobjective 2 through total reflective mirror 5, converge and shine on the digital micro-mirror 18 by pinhole filter 3 and collimation lens 4, folded light beam 20 is being positioned at the clear reproduction picture of one-tenth on the frosted glass of locating its focal plane 19 by the synthetic aperture lensless fourier transform digital hologram modulation from computing machine 11 outputs through plus lens 13.
Shown in Figure 5 is to reproduce the holographic reconstructed image that Fresnel synthetic aperture hologram obtains with DMD, and purpose is that the result with the inventive method makes comparisons.The synthetic method of this hologram is the same.Can see that four reproduction pictures do not overlap, and zero order diffracted light has been diffused in very big zone, proved that from the negative the inventive method reproduces superiority in the holographic images process at DMD.
Shown in Figure 6ly be the lensless Fourier transform hologram result and reproduce the holographic images that obtains with DMD.
Comparison diagram 6 (B), Fig. 6 (D) and Fig. 6 (F) can see that the size of amplifying hologram can make full use of all mirror units of DMD, the dutycycle height, thereby the holographic images quality of reproducing is good, but it is reduced to reproduce picture; The size constancy that keeps hologram can only utilize the part mirror unit of DMD, and dutycycle is low, thereby reproduces the poor quality of holographic images, does not have reduced but guaranteed to reproduce picture; The synthetic aperture method has been utilized all mirror units of DMD, and dutycycle improves, thereby also obviously raising of the holographic images quality of reproducing, and reproduces as not having reduced.Promptly can improve the quality of holographic reconstructed image with the method for synthetic aperture.In addition, owing to use lensless Fourier transform hologram to reproduce holographic images, zero order diffracted light all has been limited in the very little zone, and this also helps the reproduction of holographic images.
Claims (2)
1. a digital micro-mirror reproduces the optimization method of holographic images, it is characterized in that: earlier by CMOS recording light photosensitive elements, four width of cloth holograms of gathering, four width of cloth holograms with the CMOS record, narrow down to 1/4th of original pixel respectively, then, the hologram after four width of cloth are dwindled is spliced into the synthetic aperture hologram that same pixel is arranged with DMD, obtains high-quality holographic reconstructed image by DMD.
2. digital micro-mirror according to claim 1 reproduces the optimization method of holographic images, when it is characterized in that the synthetic aperture hologram, in order to improve dutycycle, to the hologram binary conversion treatment.
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Cited By (4)
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| CN102591123A (en) * | 2012-03-13 | 2012-07-18 | 苏州大学 | Real-time three-dimensional display device and display method |
| CN105812760A (en) * | 2011-04-19 | 2016-07-27 | 杜比实验室特许公司 | High luminance projection displays and associated methods |
| CN107121917A (en) * | 2017-05-09 | 2017-09-01 | 四川大学 | A kind of method for suppressing to calculate holographic speckle noise |
| CN111459004A (en) * | 2020-04-14 | 2020-07-28 | 清华大学 | Splicing method of double-light-path synthetic aperture hologram |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105812760A (en) * | 2011-04-19 | 2016-07-27 | 杜比实验室特许公司 | High luminance projection displays and associated methods |
| CN105812760B (en) * | 2011-04-19 | 2018-10-16 | 杜比实验室特许公司 | The bloom projection display and correlation technique |
| US10462437B2 (en) | 2011-04-19 | 2019-10-29 | Dolby Laboratories Licensing Corporation | High luminance projection displays and associated methods |
| US11637996B2 (en) | 2011-04-19 | 2023-04-25 | Dolby Laboratories Licensing Corporation | High luminance projection displays and associated methods |
| CN102591123A (en) * | 2012-03-13 | 2012-07-18 | 苏州大学 | Real-time three-dimensional display device and display method |
| CN102591123B (en) * | 2012-03-13 | 2014-12-10 | 苏州大学 | Real-time three-dimensional display device and display method |
| CN107121917A (en) * | 2017-05-09 | 2017-09-01 | 四川大学 | A kind of method for suppressing to calculate holographic speckle noise |
| CN107121917B (en) * | 2017-05-09 | 2019-05-31 | 四川大学 | A method of inhibit to calculate holographic speckle noise |
| CN111459004A (en) * | 2020-04-14 | 2020-07-28 | 清华大学 | Splicing method of double-light-path synthetic aperture hologram |
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Application publication date: 20110216 |