CN106054378A - Portable wide-field-of-view imaging device and method - Google Patents

Portable wide-field-of-view imaging device and method Download PDF

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Publication number
CN106054378A
CN106054378A CN201610152914.9A CN201610152914A CN106054378A CN 106054378 A CN106054378 A CN 106054378A CN 201610152914 A CN201610152914 A CN 201610152914A CN 106054378 A CN106054378 A CN 106054378A
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imaging
big
lens
view field
imaging device
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CN106054378B (en
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刘杰涛
许洁
王娇阳
杨莹
张扬
邵晓鹏
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Xidian University
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    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/0025Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for optical correction, e.g. distorsion, aberration
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00Optical objectives specially designed for the purposes specified below
    • G02B13/001Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
    • G02B13/0055Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00Optical objectives specially designed for the purposes specified below
    • G02B13/001Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
    • G02B13/0085Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing wafer level optics

Abstract

The invention provides a portable wide-field-of-view imaging device and a method, which are used for solving technical problems of complex structure and large size of an existing wide-field-of-view imaging device. The imaging device comprises an imaging main lens, a micro-lens array, a wave zone plate, a detector and a signal processing unit, wherein the imaging main lens adopts a double-layer glassed homocentric spherical lens structure; the micro-lens array adopts a semispherical structure formed by compactly arranging a plurality of micro-lens units, and each micro-lens unit adopts a double-laminated-glass lens structure; the wave zone plate adopts a semispherical structure formed by a plurality of Fresnel wave zone plate units, the Fresnel wave zone plates in the same annular band are identical in radius; and the micro-lens array, the wave zone plate and the detector are sequentially arranged in a coaxial manner at one side of an imaging main optical axis of the imaging main lens, and the detector is vertical with the imaging main optical axis and electrically connected with the signal processing unit. The imaging device provided by the invention has the characteristics of small size, wide field of view and high resolution, and can be applied to forest monitoring, ground monitoring, astronomical observation and space supervision.

Description

Portable big view field imaging device and method
Technical field
The invention belongs to optical image technology field, relate to a kind of big view field imaging device and method, be specifically related to one Portable big view field imaging device and method, can be used for the fields such as forest monitoring, over the ground monitoring, astronomical observation and space supervision.
Background technology
Along with the development of space technology, the scene letter that people are abundant in wishing the most urgently to obtain big field range Breath, so the acquisition in real time of big visual field, high resolution space image information is particularly important.As Image Acquisition necessary group Become part, big visual field, high-resolution imaging system design pressure the most increasing.Traditional big view field imaging system is mainly wrapped Include the single-lens scanning imaging system of small field of view high-resolution, fish-eye lens hyper-hemispherical staring imaging system, annulus stare panorama As system, catadioptric big view field imaging system and multisensor array big view field imaging system, but all cannot take into account big visual field, height Resolution.
In scientific research, sight is gradually put into combination and is calculated as the novel big visual field of picture, high-resolution small-sized by people Optical imaging system development comes up.At present there are 3 kinds of modes combining the big view field imaging being calculated as picture: 1. combine multiple small field of view The big view field imaging mode of imaging subsystems, 2. combines the compound eye type big view field imaging mode of multilamellar curved surface, 3. combines globe lens Big view field imaging mode with micro-camera array.
Wherein, 1. the plant mode uses the structure of multiple different sub-systems to design, and utilizes partly overlapping of adjacent subsystems, Big view field imaging, such as: Chinese patent application, Authorization Notice No. CN102821238B, title is realized in conjunction with image processing algorithm For the patent of invention of " a kind of wide-field ultra optical imaging system ", disclose a kind of wide-field ultra optics Imaging system, this invention utilizes the image of adjacent imaging subsystems to overlap, by image processing apparatus and have system control The system control device of function obtains big view field imaging effect, but system bulk is big, and Project Realization difficulty is big, so the most not Use;2. the plant mode uses the design of large scale multilamellar toroidal lens, analog simulation biology curved compound eye imaging, utilizes visit more Survey device combines, and receives big view field image surface, such as: Chinese patent application, Authorization Notice No. CN102944934B, entitled: " a kind of Multilayer curve compound eye type big view field imaging system " patent of invention, disclose a kind of multilayer curve compound eye type big view field imaging system System, this invention uses multilamellar compound eye structural design philosophy, by the way of multichannel ccd detector combines, it is achieved big view field imaging, But system bulk and quality are the biggest, and large-sized toroidal lens cost is high, also needs to explore development further;3. plant mode Use the structure design that homocentric main lens combines with camera array, first with the ball symmetrical structure alignment field of homocentric main lens Relevant aberration, next utilizes micro-camera array to correct the residual aberration of globe lens, each microfacies machine array element pair further Answer a detector, followed by the hemisphere arrangement simulation curved detector imaging of multi-detector, finally utilize multi-detector to become The splicing fusion of picture finally realizes big view field imaging effect, such as: Chinese patent application, Authorization Notice No. CN102866480B, Entitled " a kind of based on the big field optical imaging system calculating imaging technique ", discloses a kind of based on calculating imaging technique Big field optical imaging system, this invention achieves big by the design of homocentric globe lens and the calculating arrangement of micro-camera array Visual field, high-resolution imaging, but planar detector cannot completely mate with curved surface picture part edge can be caused to distort, and microfacies Machine array volume is excessive limits this systematic difference scope.
Summary of the invention
It is an object of the invention to the defect overcoming above-mentioned prior art to exist, it is proposed that portable big view field imaging device And method, the most portable technology caused greatly because of structure complexity, volume for solving existing big view field imaging device and method is asked Topic.
To achieve these goals, the technical scheme that the present invention takes is:
A kind of portable big view field imaging device, including: imaging main lens 1, it is used for gathering optical signal, obtains big visual field figure Picture;Detector 4, for receiving plane image information;Signal processing unit 5, is used for processing plane picture information;Detector 4 In the imaging primary optical axis side of imaging main lens 1, and arrange with imaging main lens 1 primary optical axis altogether, and electric with signal processing unit 5 Property connect;Between imaging main lens 1 and detector 4, it is disposed with microlens array 2 and zone plate 3;Imaging main lens 1 Use homocentric globe lens structure;Microlens array 2 uses the semiglobe closely arranged by multiple lenticule unit, is used for changing The optical path direction of big view field image, corrects the residual aberration of this big view field image simultaneously, and is divided into and multiple uniformly neglects Field picture;Zone plate 3 uses the semiglobe that multiple Fresnel blade unit forms, for correcting uniform small field of view image Emitting light path, and carry out image planes conversion, it is thus achieved that plane picture information;Imaging main lens 1, microlens array 2 are with zone plate 3 altogether The heart.
Above-mentioned portable big view field imaging device, homocentric globe lens uses double-layer glass structure.
Above-mentioned portable big view field imaging device, multiple lenticule unit the semiglobe closely arranged, is by multiple Lenticule unit, with hemisphere face center as basic point, globally radially becomes the arrangement of multi-layer circular annulus to be formed, each lenticule list The corresponding 1 ° of angle of visual field of unit, wherein lenticule unit uses double glyglass lens arrangement.
Above-mentioned portable big view field imaging device, the semiglobe of multiple Fresnel blade units composition, is by multiple Fresnel blade unit, with hemisphere face center as basic point, globally radially becomes the arrangement of multi-layer circular annulus to be formed, and same In annulus, the radius of Fresnel zone plate unit cell is identical.
Above-mentioned portable big view field imaging device, multiple lenticule unit and multiple Fresnel blade units, micro- Relevant position one_to_one corresponding on lens array sphere and zone plate sphere, wherein lenticule unit and Fresnel blade unit Size be micron number magnitude.
Above-mentioned portable big view field imaging device, detector 4 is vertical with the primary optical axis of imaging main lens 1.
The formation method of above-mentioned portable big view field imaging device, comprises the steps:
Step 1: utilize imaging main lens 1 to gather optical signal, obtains curved surface big visual field optical signal;
Step 2: utilize microlens array 2 split described curved surface big visual field optical signal and change its optical path direction, simultaneously school The just residual aberration of this original big visual field optical signal, obtains the uniform small field of view optical signal of multiple almost plane;
Step 3: utilize zone plate 3 to change the optical path direction of uniform small field of view optical signal of the plurality of almost plane, obtain Take the level light signals parallel with the primary optical axis of imaging main lens 1, obtain multiple uniform planar light signal;
Step 4: utilize detector 4 to receive the plurality of uniform planar light signal, obtain the big view field image surface of original plane Information;
Step 5: utilize signal processing unit 5 to process described original plane big view field image surface information, it is thus achieved that high-resolution Big view field imaging effect.
The formation method of above-mentioned portable big view field imaging device, the big field image of process original plane described in step 5 Surface information, including image co-registration, brightness uniformity and the super-resolution rebuilding of view field image surface information big to original plane.
The present invention compared with prior art, has the advantage that
1) due to the fact that and on the primary optical axis between main lens and detector, set gradually homocentric small size lenticule battle array Row and the zone plate of homocentric high integration, and prior art arranges between main lens and detector multiple micro-camera array The structure of big view field imaging system is compared, and the volume weight reducing system reduces, and has expanded systematic difference field.
2) due to the fact that employing microlens array corrects optical path direction with Fresnel zone plate, be converted to put down by curved surface picture Image surface, mates existing planar detector, uses the arrangement simulation curved surface detection of detector curved surface in existing big view field imaging technology The structure of device is compared, and eliminates the marginal distortion of curved planar reformation, improves the imaging resolution of system edges visual field.
3) due to the fact that and employing planar detector structure, with existing big view field imaging technology use the half of multi-detector The structure of ball arrangement simulation curved detector is compared, and reduces the complexity of system structure, has widened systematic difference scope.
Accompanying drawing explanation
Fig. 1 is overall structure schematic diagram in the present invention;
Fig. 2 is the formation method principle schematic in the present invention;
Fig. 3 is the structural representation of microlens array in the present invention;
Fig. 4 is the structural representation of zone plate in the present invention;
Fig. 5 is the formation method FB(flow block) in the present invention;
Fig. 6 is the modulation transfer function (MTF) simulation curve figure of different visual fields in the present invention;
Fig. 7 is the emulation point range figure of different visual fields in the present invention.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the purpose of the present invention, technical scheme and technique effect are made the most in detail Thin description.
With reference to Fig. 1, it is the system structure schematic diagram of the present invention, including: main lens 1, microlens array 2, zone plate 3, spy Survey device 4 and signal processing unit 5.Microlens array 2, zone plate 3 and detector 4 are successively at the imaging key light of imaging main lens 1 The coaxial arrangement in axle side, detector 4 is electrically connected with signal processing unit 5 simultaneously.
Main lens 1 uses the homocentric globe lens structure of two half-sphere mirror, and material is the lanthanum crown of high index of refraction, high Abbe constant Glass LAK33, for receiving the radiated light energy of scene;The capital of general imaging system introduces a series of aberrations such as spherical aberration, broom Difference, astigmatism, aberration and distortion, need to introduce the aberration correction that cooperates of multiple optical element, so system structure is general more Complexity, owing to the rotational symmetry structure of this main lens 1 designs the aberrations such as recoverable coma, astigmatism, distortion and axial chromatic aberration, institute So that simple chondritic can be used to obtain the imaging effect of high-resolution;And owing to main lens 1 uses globe lens structure, can Obtain 180 ° of interior big view field imaging effects.
Microlens array 2 uses hemispherical dome structure, is positioned at the imaging primary optical axis side of main lens 1, row homocentric with main lens 1 Cloth, is used for the optical path direction after correcting the residual aberration of main lens 1 and tentatively changing by main lens 1, can be by original light path Tentatively it is converted into parallel light path, thus the curved surface image planes of main lens 1 are tentatively converted into plane image planes;In microlens array 2 Lenticule unit, with hemisphere face center as basic point, globally radially becomes the distribution of multi-layer circular annulus to ultimately form hemispherical configuration, Lenticule unit on same annulus is along element thickness direction close-packed arrays, and lenticule unit is arranged in environment-friendly type crown glass H- In the hemispherical substrate of K9L;Owing to the design of cemented doublet can eliminate spherical aberration, aberration, coma these three aberration, and homocentric Main lens remains part spherical aberration and aberration, so each lenticule unit uses material to be environment-friendly type dense flint glass H-ZF62 Design with the cemented doublet of high-refractivity lanthanide flint glass N-LASF41, correct the residual aberration of main lens 1 further, carry The imaging resolution of high system;The angle of visual field that each lenticule unit is corresponding 1 °, so microlens array regarding main lens 1 greatly Field is evenly divided into the small field of view that size is 1 °;Lenticule unit is in micron number magnitude, it is ensured that the portability of system;
Zone plate 3 uses the structure of Fresnel zone plate, arranges with main lens 1 centre of sphere altogether, and is arranged at microlens array 2 Afterwards;Zone plate 3 is laser engraving in the substrate of synthesis fused silica glass LITHOSIL-Q, and size, in micron number magnitude, is entered One step correction optical path direction, it is ensured that system-wide small size and quality;Fresnel blade unit in zone plate 3 is with zone plate The sphere centre of 3 is basic point, globally radially becomes the distribution of many circular band to ultimately form hemispherical configuration, each Fresnel Blade unit correspond to a lenticule unit of sphere corresponding position;According to the focal length in different visual fields, calculate each luxuriant and rich with fragrance alunite The center radius of your zone plate unit cell, due to the corresponding identical focal length of the Fresnel blade unit on same annulus so radius Equal, and the corresponding different focal length of Fresnel blade unit on different annulus is so radius is unequal;Zone plate 3 can be used for Change optical path direction further, in combination with microlens array, this emitting light path is converged on same focal plane so that curved surface Image planes are converted to plane image planes, and distorting in calibration edge visual field, matches with existing planar detector.
Detector 4 uses ccd detector, and this detector 4 is total to primary optical axis with imaging main lens 1 after zone plate 3, and visits Survey device plane vertical with the central optical path of imaging main lens 1, for receiving plane imaging effect;After this detector 4 receives correction Optical signal, be real-time transmitted to signal processing unit 5.
Signal processing unit 5 is electrically connected with detector 4, the optical signal of pick-up probe 4;According to calculating image-forming principle, Utilize image procossing principle to carry out the optical signal of each visual field merging in signal processing unit 5, brightness uniformity and super-resolution The steps such as rate reconstruction, final output big visual field, high-resolution imaging effect.
With reference to Fig. 2, it is the formation method principle schematic in the present invention: scene light is incident to imaging main lens from object space 1, arrive microlens array 2 after the transmission of imaged main lens 1, then be transmitted to Fresnel zone plate 32 two times through microlens array, Utilize Fresnel zone plate 3 to change optical path direction further, after be transmitted to imaging on detector 4;Final at signal processing unit 5 In, utilize and export 160 ° of big visual fields, height into principle of image fusion, brightness uniformity principle and image super-resolution rebuilding principle Image in different resolution.Wherein, the structural representation of microlens array 2 and zone plate 3 is the most as shown in Figure 3 and Figure 4.
With reference to Fig. 3, be the structural representation of microlens array in the present invention: the lenticule unit in microlens array 2 with Hemisphere face center is basic point, globally radially becomes the distribution of multi-layer circular annulus to ultimately form hemispherical configuration, on same annulus The thickness direction close-packed arrays on lenticule unit edge, lenticule unit is all pasted on the hemispherical of environment-friendly type crown glass H-K9L In substrate.
With reference to Fig. 4, it is the structural representation of zone plate in the present invention: the Fresnel blade unit in zone plate 3 is closing Becoming laser engraving in the substrate of fused silica glass LITHOSIL-Q, Fresnel blade unit is with the sphere centre of zone plate 3 For basic point, globally radially the distribution of circular many annulus ultimately forms hemispherical configuration.
With reference to Fig. 5, it is the formation method FB(flow block) in the present invention, comprises the steps:
Step 1: utilize imaging main lens 1 to gather the optical signal of scene, obtains curved surface big visual field optical signal;
Step 2: utilize microlens array 2 split curved surface big visual field optical signal and tentatively change curved surface big visual field optical signal Optical path direction, corrects spherical aberration and the axial chromatic aberration of the residual of this original big visual field optical signal simultaneously, obtains multiple almost plane Uniformly small field of view optical signal;
Step 3, utilizes zone plate 3 to change the optical path direction of uniform small field of view optical signal of multiple almost plane further, Obtain the level light signals parallel with the primary optical axis of imaging main lens 1, obtain multiple uniform planar light signal;
Step 4, utilizes detector 4 to receive multiple uniform planar light signal, obtains original plane big view field image surface information;
Step 5, utilizes signal processing unit 5 view field image surface big to original plane information to carry out image co-registration, brightness uniformity Change and super-resolution rebuilding etc. processes, it is thus achieved that high-resolution big view field imaging effect.
Below in conjunction with emulation experiment, the technique effect of the present invention is described further.
1, simulated conditions
On the basis of calculating initiating structure by P-W method, ZEMAX optical design software is used to optimize whole system, simulation Imaging effect.
2, emulation content
(1) system modulation being transferred function by emulation, its result is as shown in Figure 6.
(2) emulating system imaging face light path distribution situation, its result is as shown in Figure 7.
With reference to Fig. 6, it is the modulation transfer function (MTF) simulation curve figure of different visual fields in the present invention: Fig. 6 (a), Fig. 6 (b), Fig. 6 C () and Fig. 6 (d) represent 0 ° of visual field, 8 ° of visual fields, 10 ° of visual fields and the modulation transfer function (MTF) curve of 16 ° of visual fields, the horizontal stroke of curve respectively Coordinate representation spatial frequency, vertical coordinate represents the size of modulation transfer function (MTF) (MTF) numerical value, T from S represents different visual field respectively Meridian and the MTF curve in sagitta of arc direction, DIFF.LIMIT represents the system diffraction limit in this visual field.
In Fig. 6 (a), the meridian (T) of 0 ° of visual field and the MTF curve on the sagitta of arc (S) direction and the diffraction limit curve of system Almost overlap, and at cut-off frequency 50lp/mm, be up to 0.86, illustrate 0 ° of visual field system imaging quality preferable;In Fig. 6 (b), 8 ° of visual field meridians (T) are consistent, at cut-off frequency with the diffraction limit curvilinear trend of system with the MTF curve on the sagitta of arc (S) direction At 50lp/mm, MTF numerical value is 0.35, meets imaging requirements;In Fig. 6 (c), on 10 ° of visual field meridians (T) and the sagitta of arc (S) direction MTF curve is consistent with the diffraction limit curvilinear trend of system, and at cut-off frequency 50lp/mm, MTF numerical value is 0.30, meets imaging Requirement;In Fig. 6 (d), 10 ° of visual field meridians (T) and the MTF curve on the sagitta of arc (S) direction and the diffraction limit curvilinear trend of system Unanimously, although meridian is partially separated with the MTF curve on sagitta of arc direction, and overall trend is identical, at cut-off frequency 50lp/mm MTF numerical value is 0.30, meets imaging requirements.
With reference to Fig. 7, it is the emulation point range figure of different visual fields in the present invention: Fig. 7 (a), Fig. 7 (b), Fig. 7 (c) and Fig. 7 (d) point Biao Shi 0 ° of visual field, 8 ° of visual fields, 10 ° of visual fields and the system point range figure of 16 ° of visual fields.The principle of point range figure is that simulated optical system exists Imaging in image planes, is i.e. by calculating, and a series of thing sides point by after optical system, situation about being imaged in image planes is real Border is drawn out.In figure, root mean square radii refers to the size of typical disc of confusion, the speckle of this system reality of reflection that can be quantitative Point size, in figure, geometry disc of confusion radius refers to the diameter of whole disc of confusion;Ensure during judge that root mean square radii is less than selected by system The pixel dimension of detector.
In Fig. 7 (a), the system root mean square radii of 0 ° of visual field is 0.442 μm, much smaller than the pixel of the detector that system is drafted Size;In Fig. 7 (b), the system root mean square radii of 8 ° of visual fields is 3.823 μm, less than the pixel dimension of the detector that system is drafted 5.5μm;In Fig. 7 (c), the system root mean square radii of 10 ° of visual fields is 5.383 μm, less than the pixel chi of the detector that system is drafted Very little 5.5 μm;In Fig. 7 (d), the system root mean square radii of 16 ° of visual fields is 4.973 μm, less than the pixel of the detector that system is drafted Size 5.5 μm;To sum up, the present invention has excellent optical property.
The content not described in detail in description of the invention belongs to the known technology of those skilled in the art.Think based on the present invention The correction thought and change are still within the claims of the present invention.

Claims (8)

1. a portable big view field imaging device, including:
Imaging main lens (1), is used for gathering optical signal, obtains big view field image;
Detector (4), for receiving plane image information;
Signal processing unit (5), is used for processing plane picture information;
Described detector (4) is positioned at the imaging primary optical axis side of imaging main lens (1), and primary optical axis common with it arrangement, and with letter Number processing unit (5) is electrically connected with;
It is characterized in that:
Between described imaging main lens (1) and detector (4), it is disposed with microlens array (2) and zone plate (3);Institute State imaging main lens (1) and use homocentric globe lens structure;Described microlens array (2) uses and is closely arranged by multiple lenticule unit The semiglobe of cloth, for changing the optical path direction of described big view field image, corrects the residual aberration of this big view field image simultaneously, And it is divided into multiple uniform small field of view image;Described zone plate (3) uses half that multiple Fresnel blade unit forms Spherical structure, for correcting the emitting light path of described uniform small field of view image, and carries out image planes conversion, it is thus achieved that plane picture information; Described imaging main lens (1), microlens array (2) are homocentric with zone plate (3).
Portable big view field imaging device the most according to claim 1, it is characterised in that described homocentric globe lens uses double Layer glass structure.
Portable big view field imaging device the most according to claim 1, it is characterised in that described by multiple lenticule unit Closely the semiglobe of arrangement, is with hemisphere face center as basic point by multiple lenticule unit, globally radially becomes multi-layer circular Annulus arrangement is formed, the corresponding 1 ° of angle of visual field of each lenticule unit, and wherein lenticule unit uses double glyglass lens knot Structure.
Portable big view field imaging device the most according to claim 1, it is characterised in that the plurality of Fresnel zone plate The semiglobe of unit composition, is with hemisphere face center as basic point by multiple Fresnel blade units, globally radially becomes many Layer circular band arrangement is formed, and in same annulus, the radius of Fresnel zone plate unit cell is identical.
Portable big view field imaging device the most according to claim 1, it is characterised in that the plurality of lenticule unit with Multiple Fresnel blade units, the relevant position one_to_one corresponding on microlens array sphere and zone plate sphere, wherein The size of lenticule unit and Fresnel blade unit is micron number magnitude.
Portable big view field imaging device the most according to claim 1, it is characterised in that described detector (4) and imaging The primary optical axis of main lens (1) is vertical.
The formation method of portable big view field imaging device the most according to claim 1, comprises the steps:
1) utilize imaging main lens (1) to gather optical signal, obtain curved surface big visual field optical signal;
2) utilize microlens array (2) split described curved surface big visual field optical signal and change its optical path direction, correct this former simultaneously Begin the residual aberration of big visual field optical signal, obtains the uniform small field of view optical signal of multiple almost plane;
3) utilize zone plate (3) to change the optical path direction of uniform small field of view optical signal of the plurality of almost plane, obtain and become As the level light signals that the primary optical axis of main lens (1) is parallel, obtain multiple uniform planar light signal;
4) utilize detector (4) to receive the plurality of uniform planar light signal, obtain original plane big view field image surface information;
5) signal processing unit (5) is utilized to process described original plane big view field image surface information, it is thus achieved that high-resolution big visual field Imaging effect.
The formation method of portable big view field imaging device the most according to claim 7, it is characterised in that step 5) in institute The process original plane big view field image surface information stated, image co-registration, brightness including view field image surface information big to original plane are equal Homogenize and super-resolution rebuilding.
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