CN103941568A - Multidimensional automatic super-resolution digital holographic imaging device and method - Google Patents
Multidimensional automatic super-resolution digital holographic imaging device and method Download PDFInfo
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Abstract
The invention discloses a multidimensional automatic super-resolution digital holographic imaging device and method and belongs to the technical field of optical diffraction imaging and digital holography. Firstly, the multidimensional automatic super-resolution digital holographic imaging device is built, the grating direction in a spatial light modulator is modulated through a computer, and the grating direction is modulated from 0 degree to 180 degrees and is modulated by 0.5 degree each time, so that a 360 digital hologram is obtained; then, Fourier transform is conducted on the 360 digital hologram through Matlab software to obtain reconstructed images, and each reconstructed image is provided with six separated sub reconstructed images; finally accurate positioning is conducted on the six sub reconstructed images in each reconstructed image through a frequency domain registration method with sub pixel accuracy, different frequency information of the sub reconstructed images in 360 reconstructed images is extracted through wavelet transform and weighting fusion is conducted on the different frequency information, so that a multidimensional super-resolution reconstructed image is obtained. By means of the multidimensional automatic super-resolution digital holographic imaging device and method, multiple different directional diffraction grade holograms can be automatically obtained, digital holographic imaging resolution can be improved in multidimensional directions, and the device and method can be applied to fields of biomedicine, micro-nano detection and the like which are of higher requirements for resolution.
Description
Technical field
The invention discloses a kind of multidimensional automatic super-resolution digital hologram imaging device and method, these apparatus and method belong to optical diffraction imaging and Digital Holography field.
Background technology
The resolution of digital holographic imaging systems is subject to the restriction of effective diaphragm, and the sensitive chip size that is mainly reflected in the imageing sensors such as CCD is less, makes its resolution be limited to the physical optics restriction that diffraction of light causes.Simultaneously, because the Pixel size of CCD is subject to certain restrictions in manufacturing technology, it is hundreds of line to the digital hologram of every millimeter that digital hologram can only obtain spatial frequency, causes the loss of object light ripple high-frequency information, has had a strong impact on the resolution of digital holographic imaging systems.Simple effective method is to shorten the distance of object to CCD, but this is what to sacrifice the visual field of imaging system be cost, is putting forward the demand that often cannot meet actual field of detection in high-resolution situation.In recent years, researchist is incorporated into super-resolution technique in digital hologram imaging gradually, and the method combining information optical imagery theory, from the numerical aperture raising imaging resolution of light path, is easier to meet the demand of practical application.Mainly contain three kinds of super-resolution digital hologram methods, the first is method for spacial multiplex, adopts CCD scan method to obtain the information of diffraction light diverse location, then the hologram of diverse location is synthesized to reproduction.The second is multiple beam means of illumination, and the method records a series of digital holograms successively by the incident direction that changes lighting light wave, and they are pressed to the synthetic reproduction of certain way.The third is grating method, utilizes grating that the high-frequency spectrum originally dropping on outside CCD is collected.Spatial reuse and multiple beam means of illumination need to mobile CCD or are changed illumination direction, all need mechanically actuated.Be entity grating and super-resolution imaging based on grating adopts at present, can only improve the resolution in one or two directions, cannot realize multidirectional super-resolution imaging.
Summary of the invention
In order to improve in multiple directions the resolution of digital holographic imaging systems, the invention provides a set of multidimensional automatic super-resolution digital hologram imaging device and method.
The automatic super-resolution digital holography imaging device of multidimensional, by laser instrument, fiber coupler, fiber optic splitter, optical fiber collimator, testing sample, spatial light modulator, beam cementing prism, imageing sensor and computing machine composition, described laser emitting end has assembled described fiber coupler and fiber optic splitter successively, the laser beam of laser emitting is perpendicular to fiber coupler and fiber optic splitter, be divided into two-beam through fiber optic splitter laser beam, wherein a branch of conduct is passed through the direct vertical incidence of optical fiber on described beam cementing prism with reference to light wave, a branch ofly in addition impinge perpendicularly on described optical fiber collimator as object light ripple through optical fiber, the object light ripple of optical fiber collimator outgoing impinges perpendicularly on described testing sample, described spatial light modulator is placed in testing sample front successively, beam cementing prism and imageing sensor, its spatial light modulator is connected with described computing machine with imageing sensor, and, described spatial light modulator is amplitude type transmission-type spatial light modulator, grating angle is wherein adjustable, and beam sizes is greater than the region to be measured of testing sample.
Adopt the automatic super-resolution digital hologram of above-mentioned multidimensional imaging device can obtain super-resolution digital holography imaging, this formation method comprises the steps:
(1) record several super-resolution digital holograms: utilize computing machine modulation spatial light modulator, the direction of the grating in spatial light modulator regulates from 0 ° to 180 °, 0.5 ° of each adjusting, computer control imageing sensor continuous recording 360 width digital holograms;
(2) obtain Reconstructed image: the 360 width digital holograms that obtain are deposited in computing machine, programme by Matlab software, respectively 360 width digital holograms are carried out to Fourier transform, obtain reproducing picture, every width reproduces picture has the son of 6 separation to reproduce picture;
(3) obtain super-resolution Reconstructed image: six sub pictures that reproduce that utilize the frequency domain registration method with sub-pixel precision to reproduce in picture each width are accurately located, adopt wavelet transformation to extract the different frequency information of the son reproduction picture in 360 width reproduction pictures, the different frequency information obtaining is weighted to fusion, obtains the reproduction picture of multidimensional super-resolution.
Described laser instrument adopts the solid state laser that centre wavelength is 532nm, and power is 300mW.
It is 1920 × 1080 pixels that described spatial light modulator adopts resolution, and Pixel size is the amplitude type transmission-type spatial light modulator of 8.5 μ m × 8.5 μ m.
It is 4016 × 2672 pixels that described imageing sensor adopts CCD, and pixel dimension is the CCD camera of 9 μ m × 9 μ m.
Beneficial effect of the present invention: multidimensional automatic super-resolution digital hologram imaging device and method, by spatial light modulator being loaded automatically to the grating of different angles, collect multidirectional object light ripple high-frequency information, realize multidimensional super-resolution imaging, this formation method is without Mechanical Moving optical element and manual operations, can realize the imaging of the automatic super-resolution digital hologram of multidimensional, can be used for the application such as the biomedicine higher to resolution requirement, micro-nano detection.
Brief description of the drawings
Fig. 1 is the automatic super-resolution digital holography imaging device of multidimensional index path.
1, laser instrument, 2, fiber coupler, 3, fiber optic splitter, 4, optical fiber collimator, 5, testing sample, 6, spatial light modulator, 7, beam cementing prism, 8 imageing sensors, 9, computing machine.
Embodiment
The automatic super-resolution digital hologram of multidimensional imaging device, is made up of laser instrument 1, fiber coupler 2, fiber optic splitter 3, optical fiber collimator 4, testing sample 5, spatial light modulator 6, beam cementing prism 7, imageing sensor 8 and computing machine 9, as shown in Figure 1.Laser instrument 1 in the automatic super-resolution digital holography imaging device of multidimensional is solid state laser, and the centre wavelength of employing is 532nm, and power is 300mW.It is 1920 × 1080 pixels that spatial light modulator 6 adopts resolution, and Pixel size is the amplitude type transmission-type spatial light modulator of 8.5 μ m × 8.5 μ m.It is 4016 × 2672 pixels that imageing sensor 8 adopts resolution, and pixel dimension is the CCD camera of 9 μ m × 9 μ m.
Laser instrument 1 exit end has assembled fiber coupler 2 and fiber optic splitter 3 successively, laser instrument 1 emitting laser light beam is perpendicular to fiber coupler 2 and fiber optic splitter 3, be divided into reference light and object light two-beam ripple through the laser beam of fiber optic splitter 3, the direct vertical incidence of reference light wave process optical fiber is wherein on beam cementing prism 7, object light ripple impinges perpendicularly on optical fiber collimator 4 through optical fiber, the object light ripple of optical fiber collimator 4 outgoing impinges perpendicularly on testing sample 5, testing sample 5 fronts placement space photomodulator 6 successively, beam cementing prism 7 and imageing sensor 8.Spatial light modulator 6 is connected with computing machine 9 with imageing sensor 8, utilizes computing machine 9 that the grating of different angles is carried in spatial light modulator 6.
Utilize computing machine to carry out the sequential control of imageing sensor 8 and spatial light modulator 6, the loading of the grating information by Labview software implementation space photomodulator 6, after every loading one amplitude grating information, computing machine 9 control chart image-position sensors 8 record digital hologram, the grating of spatial light modulator 6 changes and is nyctitropicly spaced apart 0.5 °, the cycle index 360 width digital holograms successively from 0 ° to 180 °.Each width digital hologram has the inferior diffraction reconstruction picture of three levels, obtains continuously 360 width digital holograms, and the reproduction of 360 width digital holograms is looked like to superpose.
Utilize the automatic super-resolution digital holography imaging device of multidimensional, can obtain super-resolution digital holography image by following step:
1) by the automatic super-resolution digital holography imaging device of multidimensional, to interfere on beam cementing prism 7 by the reference light wave through fiber optic splitter 3 with through the object light ripple of spatial light modulator 6, the digital hologram obtaining is gathered by imageing sensor 8.Wherein, utilize computing machine 9 to modulate spatial light modulator 6, obtain the grating of different angles, the direction of grating regulates from 0 ° to 180 °, 0.5 ° of every adjusting, imageing sensor 8 is taken a width digital hologram, obtains 360 width digital holograms, be respectively H1, H2, Hi,, HN, (wherein i=0,1,2,, N, N=360).
2) obtain Reconstructed image: the 360 width digital holograms that obtain are deposited in computing machine 9, programme by Matlab software, respectively 360 width digital holograms are carried out to Fourier transform and obtain 360 width reproduction pictures, every width reproduces picture has the son of 6 separation to reproduce picture, respectively wherein (t=1 of Oit, 2,, 6).
3) obtain super-resolution Reconstructed image: 6 sub reproductions utilizing the frequency domain registration method with sub-pixel precision to reproduce in picture each width are accurately located as Oit, adopt wavelet transformation to extract the different frequency information of the son reproduction picture in 360 width reproduction pictures, the different frequency information obtaining is weighted to fusion, obtains the reproduction picture of multidimensional super-resolution.
Claims (5)
1. the automatic super-resolution digital hologram of multidimensional imaging device, by laser instrument (1), fiber coupler (2), fiber optic splitter (3), optical fiber collimator (4), testing sample (5), spatial light modulator (6), beam cementing prism (7), imageing sensor (8) and computing machine (9) composition, it is characterized in that: described laser instrument (1) exit end has assembled described fiber coupler (2) and fiber optic splitter (3) successively, laser instrument (1) emitting laser light beam is perpendicular to fiber coupler (2) and fiber optic splitter (3), be divided into two-beam through fiber optic splitter (3) laser beam, wherein a branch of conduct is passed through the direct vertical incidence of optical fiber on described beam cementing prism (7) with reference to light wave, a branch ofly in addition impinge perpendicularly on described optical fiber collimator (4) as object light ripple through optical fiber, the object light ripple of optical fiber collimator (4) outgoing impinges perpendicularly on described testing sample (5), described spatial light modulator (6) is placed in testing sample (5) front successively, beam cementing prism (7) and imageing sensor (8), its spatial light modulator (6) is connected with described computing machine (9) with imageing sensor (8), and, described spatial light modulator (6) is amplitude type transmission-type spatial light modulator, grating angle is wherein adjustable, and beam sizes is greater than the region to be measured of testing sample (5).
2. adopt the automatic super-resolution digital hologram of multidimensional as claimed in claim 1 imaging device to obtain super-resolution digital hologram formation method, it is characterized in that, comprise the steps:
(1) record several super-resolution digital holograms: utilize computing machine (9) modulation spatial light modulator (6), the direction of the grating in spatial light modulator (6) regulates from 0 ° to 180 °, 0.5 ° of each adjusting, computing machine (9) control chart image-position sensor (8) continuous recording 360 width digital holograms;
(2) obtain Reconstructed image: the 360 width digital holograms that obtain are deposited in computing machine, programme by Matlab software, respectively 360 width digital holograms are carried out to Fourier transform, obtain reproducing picture, every width reproduces picture has the son of 6 separation to reproduce picture;
(3) obtain super-resolution Reconstructed image: six sub pictures that reproduce that utilize the frequency domain registration method with sub-pixel precision to reproduce in picture each width are accurately located, adopt wavelet transformation to extract the different frequency information of the son reproduction picture in 360 width reproduction pictures, the different frequency information obtaining is weighted to fusion, obtains the reproduction picture of multidimensional super-resolution.
3. the automatic super-resolution digital holography imaging device of multidimensional as claimed in claim 1 or 2, its characteristic is: described laser instrument (1) adopts the solid state laser that centre wavelength is 532nm, and power is 300mW.
4. the automatic super-resolution digital holography imaging device of multidimensional as claimed in claim 1 or 2, its characteristic is: it is 1920 × 1080 pixels that described spatial light modulator (6) adopts resolution, and Pixel size is the amplitude type transmission-type spatial light modulator of 8.5 μ m × 8.5 μ m.
5. the automatic super-resolution digital holography imaging device of multidimensional as claimed in claim 1 or 2, its characteristic is: it is 4016 × 2672 pixels that described imageing sensor (8) adopts CCD, and pixel dimension is the CCD camera of 9 μ m × 9 μ m.
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| CN109709786A (en) * | 2019-02-25 | 2019-05-03 | 中国科学院光电技术研究所 | A kind of super-resolution digital holographic imaging systems and imaging method |
| US10663922B2 (en) | 2016-04-14 | 2020-05-26 | Boe Technology Group Co., Ltd. | Image display system and image display method |
| CN110020988B (en) * | 2019-04-04 | 2020-08-18 | 山东大学 | Super-resolution reconstruction system and reconstruction method based on micro-nano motion platform |
| CN112288633A (en) * | 2020-10-29 | 2021-01-29 | 燕山大学 | Novel sub-pixel resolution diffraction imaging method |
| CN112596362A (en) * | 2020-12-18 | 2021-04-02 | 昆明理工大学 | Full-field super-resolution digital holographic device and imaging method |
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| CN109709786A (en) * | 2019-02-25 | 2019-05-03 | 中国科学院光电技术研究所 | A kind of super-resolution digital holographic imaging systems and imaging method |
| CN110020988B (en) * | 2019-04-04 | 2020-08-18 | 山东大学 | Super-resolution reconstruction system and reconstruction method based on micro-nano motion platform |
| CN112288633A (en) * | 2020-10-29 | 2021-01-29 | 燕山大学 | Novel sub-pixel resolution diffraction imaging method |
| CN112596362A (en) * | 2020-12-18 | 2021-04-02 | 昆明理工大学 | Full-field super-resolution digital holographic device and imaging method |
| CN112596362B (en) * | 2020-12-18 | 2022-07-26 | 昆明理工大学 | Digital holographic device and imaging method for full-field super-resolution |
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