CN107462932A - A kind of Visual calculation ghost imaging system and imaging method based on optical oomputing - Google Patents
A kind of Visual calculation ghost imaging system and imaging method based on optical oomputing Download PDFInfo
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Abstract
A kind of Visual calculation ghost imaging system and imaging method based on optical oomputing, imaging system includes structure hot spot emission source, the light that structure hot spot emission source is sent is divided into two beams by beam splitter, wherein, light beam I is received after being irradiated to object to be imaged by bucket detector, and light beam II is imaged onto the photosensitive object of low speed by external modulator and for the optical information processing system of bandpass filtering image intensifying processing.The signal output part of bucket detector selectively connects internal modulator or external modulator by commutator, wherein, signal is carried in the control unit of structure hot spot emission source by internal modulator；Or signal is loaded directly on light beam II by external modulator.Optical oomputing is introduced ghost imaging, substitutes computer disposal by the present invention by internal modulation and external modulation process；Time integral calculating can be carried out automatically in observation using the photosensitive object of low speed, substitutes the terrible tomography computer ensemble average computing of tradition, can obtain the visualization ghost imaging of object to be imaged at high speed.
Description
Technical field
The present invention relates to imaging detection field, specially a kind of Visual calculation ghost imaging system based on optical oomputing and into
Image space method.
Background technology
Optics ghost imaging technique is to meet detection recovery object under test spatial information by two-way optical signal to realize.It is special
Point is that the flashlight (signal beam) comprising object information is detected by the bucket detector without spatial resolving power；Only include light
The idle light (idler beam) of source strength distributed intelligence is not by object, directly by the face battle array detection with spatial resolving power
Device is detected, such as CCD.Therefore, thing can not all be obtained by any signal all the way in two detectors corresponding to double light path
The picture of body, but by the way that the picture of object can be accessed after meeting two paths of signals.
Existing terrible imaging technique is required to front end and carries out substantial amounts of data acquisition and the processing of backend computer, very
Resource is taken, and image taking speed is slow, system complex.Certain processing time is generally required from imaging is collected, while can not be done
To direct visualizztion, it is necessary to by the first photoelectric conversion process that electric light converts again.
The content of the invention
It is an object of the invention to for above-mentioned the problems of the prior art, there is provided a kind of visualization meter based on optical oomputing
Terrible imaging system and imaging method are calculated, substitutes the computer association computing in traditional counting ghost imaging with optical oomputing, utilization is low
The visual persistence effect of the photosensitive object of speed substitutes traditional counting ghost imaging Computer ensemble average processing procedure, image taking speed
It hurry up, high resolution.
To achieve these goals, the Visual calculation ghost imaging system of the invention based on optical oomputing：
Including structure hot spot emission source, the light that structure hot spot emission source is sent is divided into two beams by beam splitter, wherein, light beam
I is received after being irradiated to object to be imaged by bucket detector, and light beam II is imaged onto on the photosensitive object of low speed by external modulator.It is described
The signal output part of bucket detector selectively connects internal modulator or external modulator by commutator, wherein, in signal process
Modulator is carried in the control unit of structure hot spot emission source；Or signal is loaded directly into light beam II by external modulator
On.
The optical information for bandpass filtering image intensifying processing is provided between the photosensitive object of external modulator and low speed
Processing system.
Radiation shield is provided between the described photosensitive object of optical information processing system and low speed.
The photosensitive object of described low speed selects human eye, fluorescent material, film or CCD camera.
The imaging method of Visual calculation ghost imaging system of the invention based on optical oomputing, comprises the following steps：
1) light that structure hot spot emission source is sent is divided into light beam I and light beam II by beam splitter, and wherein light beam I directly shines
It is mapped on object to be imaged, is received after reflection by bucket detector；
2) light intensity signal that bucket detector measurement obtains passes through commutator selectively connection internal modulator or external modulator；
Light beam II light intensity is before being modulated：I1(x1,y1, t) and=E*(x1,y1,t)E(x1,y1,t)；
In above formula, E (x1,y1, t) and it is light beam II in t coordinate points (x1,y1) place modulated before field strength, E*(x1,
y1, t) and it is E (x1,y1, t) conjugation item, I1(x1,y1, t) and it is light beam II in t coordinate points (x1,y1) place modulated before light
By force；
Bucket detector be in the total light intensity value that t detects：
I2(t)=<E*(x2,y2,t)E(x2,y2,t)>=∫obj|E(xs,ys,t)h(xs,ys,x2,y2)T(x2,y2,t)|2dx2dy2；
In above formula, (xs,ys) represent on light source a bit, (x2,y2) represent on object to be imaged a bit, E (xs,ys,
T) it is in t light source coordinates point (xs,ys) place field strength, E (x2,y2, t) and it is light beam I in t coordinate points (x2,y2) place
Field strength, E*(x2,y2, t) and it is E (x2,y2, t) conjugation item, h (xs,ys,x2,y2) it is that light wave is propagated through from light source to bucket detector
Impulse response function in journey, T (x2,y2, t) be object to be imaged aperture function, I2(t) it is a barrel detector (4) in t
The total light intensity value detected；
3) output signal of bucket detector is carried in realization pair in the control unit of structure hot spot emission source by internal modulator
Light beam II intensity modulated, or, external modulator is used to realize to light beam II after barrel output signal of detector acquisition is obtained
Intensity modulated, after light beam II is modulated by internal modulator or external modulator, the multiplication for completing light calculates (I1(x1,y1,t)×I2
(t)), transmit and transmitted after carrying out bandpass filtering enhancing processing to optical information processing system to the photosensitive object of low speed afterwards；
4) the photosensitive object of low speed (10) carries out time integral calculating automatically, realizes that ensemble average calculates as the following formula：
In above formula, I1(x1,y1, t) and represent t coordinate points (x on light beam II1,y1) light intensity, I2(t) t is represented
The total light intensity value detected on bucket detector, T represent the low speed photosensitive object retentivity time of eye.
Described optical information processing system realizes that bandpass filtering removes the back end and image of image using 4f systems
Enhancing.
Described structure hot spot emission source produces Hadamard structure speckles using the control of Matlab softwares, and passes through numeral
Micro mirror array equipment DMD is projected.
Compared with prior art, imaging system of the invention has following beneficial effect：By beam splitter by structure light
The light that spot emission source is sent is divided into two beams, and light beam I is received after being irradiated to object to be imaged by bucket detector, and light beam II is by transfering to other localities
Device processed is imaged onto on the photosensitive object of low speed, the signal output part of bucket detector by commutator selectively connection internal modulator or
External modulator, internal modulation and external modulation process of the imaging system in combination with signal, introduces ghost imaging by optical oomputing, substitutes
Computer disposal, can be directly realized by visualization ghost imaging, and the photosensitive object of low speed can carry out time integral meter automatically in observation
Calculate, substitute the terrible tomography computer ensemble average computing of tradition, the visualization ghost imaging of object to be imaged can be obtained at high speed.
Compared with prior art, imaging method of the invention has following beneficial effect：Optical oomputing is introduced into ghost imaging,
Computer disposal is substituted, new ghost imaging computation processing method is realized, visualization ghost imaging can be directly realized by, low speed is photosensitive
Object can carry out time integral calculating automatically in observation, substitute the terrible tomography computer ensemble average computing of tradition, at high speed
To the visualization ghost imaging of object to be imaged.The imaging system and imaging method of the present invention is not easy by environment temperature, humidity change
Influence, there is good anti-interference dynamic characteristic, with single channel modulation realize infinite number of array modulation.The image taking speed of the present invention
It hurry up, high resolution, compared with the existing various imaging methods for calculating ghost imaging, the imaging system more accurately can more be accelerated
The picture of object to be imaged is presented in ground, while the complexity of structure and image taking speed will not change with the raising of resolution ratio, this
The image quality of invention is high, compared with existing various terrible imaging methods, can realize closely more high-quality with distant object
The imaging of amount.
Brief description of the drawings
Visual calculation ghost imaging system structure principle chart of Fig. 1 present invention based on optical oomputing；
The structure speckle exemplary plot of Fig. 2 digital micromirror arrays equipment (DMD) projection；
The subject image that Fig. 3 CCD cameras obtain as the photosensitive object of low speed；
In accompanying drawing：1- structure hot spot emission sources；2- beam splitters；3- objects to be imaged；4- bucket detectors；5- commutators；
6- internal modulators；7- external modulators；8- optical information processing systems；9- radiation shields；The photosensitive object of 10- low speed.
Embodiment
The present invention is described in further detail below in conjunction with the accompanying drawings, but the protection model of the present invention should not be limited with this
Enclose.
The imaging process of the present invention can be expressed as：Two-beam ripple corresponds to a bucket detector and a modulator respectively,
By feeding back collective effect, reach the association computing of optical oomputing.The photosensitive object of low speed captures the light intensity signal after being modulated
Afterwards, the integral operation of optical oomputing is realized, completes the coincidence measurement of the light intensity of two-beam ripple.Object is included in secondorder correlation function
Information, i.e. object aperture function, object to be imaged finally can be showed in the photosensitive object of low speed by optical oomputing
Picture.
Visual calculation ghost imaging system and imaging method innovation of the present invention based on optical oomputing are embodied in：
First, it instead of traditional counting ghost imaging Computer association computing with optical oomputing；Second, use the photosensitive thing of low speed
Body (such as human eye) visual persistence effect substitutes traditional counting ghost imaging Computer ensemble average processing procedure；Third, directly into
Picture, computer instead of with visualization and present；Infinite number of array modulation is realized fourth, can be modulated with single channel.
Referring to Fig. 1, the Visual calculation ghost imaging system of the invention based on optical oomputing, including structure hot spot emission source 1, knot
The light that structure hot spot emission source 1 is sent is divided to for two beams by beam splitter 2, wherein, light beam I is visited after being irradiated to object 3 to be imaged by bucket
Survey device 4 to receive, light beam II is imaged onto on the photosensitive object 10 of low speed by external modulator 7.The signal output part of bucket detector 4 passes through
The selectivity of commutator 5 connection internal modulator 6 or external modulator 7, wherein, signal is carried in structure hot spot by internal modulator 6
In the control unit of emission source 1；Or signal is loaded directly on light beam II by external modulator 7.Optical information processing system
Radiation shield 9 is provided between 8 and the photosensitive object 10 of low speed.The photosensitive object 10 of low speed is human eye or CCD camera.
(1) traditional counting ghost imaging technique scheme；
The light distribution of preceding certain point is modulated, i.e., idle light (idler beam) is：
I1(x1,y1, t) and=E*(x1,y1,t)E(x1,y1,t)；
The total light intensity that detects is on bucket detector：
I2(t)=<E*(x2,y2,t)E(x2,y2,t)>=∫obj|E(xs,ys,t)h(xs,ys,x2,y2)T(x2,y2,t)|2dx2dy2；
In above formula, (xs,ys) represent on light source a bit, (x2,y2) represent on object to be imaged a bit, E (xs,ys,
T) it is light beam I in t coordinate points (xs,ys) place modulated before field strength, E (x2,y2, t) and it is light beam I in t coordinate points
(x2,y2) place modulated before field strength, E*(x2,y2, t) and it is E (x2,y2, t) conjugation item, h (xs,ys,x2,y2) it is light wave from light
Source is to the impulse response function in bucket detector communication process, T (x2,y2, t) be object to be imaged aperture function, I2(t) it is
The total light intensity value that bucket detector (4) detects in t.The picture of object is obtained by coincidence measurement, i.e., by associating fortune as follows
Calculate：
G(2)(x1,y1)=<I1(x1,y1,t)I2(t)〉
The classical calculating ghost imaging process of the above can be summarised as：Light distribution at the body surface being calculated every time
I1, with the corresponding light intensity signal I that bucket detector measurement obtains every time2, association computing is done by computer, by ensemble average (when
Between it is average) after, obtain the picture of object.It is characterized in after the data needed for imaging are obtained, all processes of imaging are all by calculating
Machine is completed.It is strong and weak that the speed of imaging depends on acquisition speed and disposal ability of the computer to data.
(2) the Visual calculation ghost imaging method of the present invention based on optical oomputing；
It is complete using persistence of vision effect present invention introduces the association computing that optical oomputing substitutes the completion of said process Computer
Into the ensemble average computing of computer, the picture of the photosensitive object replacement computer presentation object of low speed, specific technical scheme are utilized
It is as follows：
Bucket detector 4 is measured to obtained light intensity signal I2, feed back in internal modulator 6 or external modulator 7, realize photometry
Calculate (multiplication), i.e., the association computing of two light intensity：I1(x1,y1)×I2；
Light beam II is acted on after being modulated on the photosensitive object of low speed, and due to visual persistence phenomenon, light is to the photosensitive object of low speed
Caused vision still retains a period of time after light fails.I.e. light image is once formed on the photosensitive object of low speed, it will right
The sensation of this light image maintains a limited time, the light stimulus for intermediate light, is about as human eye vision persists the time
The 0.1-0.4 seconds.
In the Visual calculation ghost imaging method, light intensity changes over time, and institute's above formula ensemble average can change
The integration to the time is written as, realizes optical oomputing (integration is cumulative), i.e.,：
Wherein, T represents the low speed photosensitive object retentivity time of eye.
Controlled using Matlab softwares and produce Hadamard structure speckles, projected by digital micromirror array equipment (DMD),
Structure hot spot is as shown in Figure 2.Structure hot spot emission source 1 sends light and is divided into two beams by beam splitter 2：Light beam I passes through thing to be imaged
Body 3 (in the present embodiment object be 8 × 8 pixels alphabetical F) reflection light wave received by bucket detector 4；The selection of commutator 5 connects
Logical external modulator 7, in the electric signal feedback effect of bucket detector 4 to external modulator 7, the external modulation to light beam II is realized, is completed
Optical oomputing.The speckle that radiation shield 9 is used for after modulation, handled by the image intensifying of the bandpass filtering of optical information processing system 8.
Human eye (the photosensitive object 10 of low speed) can carry out secondorder correlation function calculating automatically in observation, obtain the picture of object 3.With CCD moulds
Anthropomorphic eye can obtain the picture of object as shown in figure 3, resolution ratio being capable of infinite height.
Claims (7)
- A kind of 1. Visual calculation ghost imaging system based on optical oomputing, it is characterised in that：Including structure hot spot emission source (1), The light that structure hot spot emission source (1) is sent is divided into two beams by beam splitter (2), wherein, light beam I is irradiated to object to be imaged (3) Received afterwards by bucket detector (4), light beam II is imaged onto on the photosensitive object of low speed (10) by external modulator (7)；The signal output part of the bucket detector (4) passes through commutator (5) selectively connection internal modulator (6) or external modulator (7), wherein, signal is carried in the control unit of structure hot spot emission source (1) by internal modulator (6)；Or signal passes through External modulator (7) is loaded directly on light beam II.
- 2. the Visual calculation ghost imaging system based on optical oomputing according to claim 1, it is characterised in that：Described investigation mission outside the city or town The optical information processing system for bandpass filtering image intensifying processing is provided between device (7) processed and the photosensitive object of low speed (10) (8)。
- 3. the Visual calculation ghost imaging system based on optical oomputing according to claim 2, it is characterised in that：Described optics Radiation shield (9) is provided between information processing system (8) and the photosensitive object of low speed (10).
- 4. the Visual calculation ghost imaging system based on optical oomputing according to any one claim in claim 1-3, It is characterized in that：The photosensitive object of described low speed (10) selects human eye, fluorescent material, film or CCD camera.
- 5. a kind of imaging method of the Visual calculation ghost imaging system based on optical oomputing as claimed in claim 1, its feature exist In：1) light that structure hot spot emission source (1) is sent is divided into light beam I and light beam II by beam splitter (2), and wherein light beam I is direct It is irradiated on object to be imaged (3), is received after reflection by bucket detector (4)；2) light intensity signal that bucket detector (4) measurement obtains by commutator (5) selectively connection internal modulator (6) or is transfered to other localities Device (7) processed；Light beam II light intensity is before being modulated：I1(x1,y1, t) and=E*(x1,y1,t)E(x1,y1,t)；In above formula, E (x1,y1, t) and it is light beam II in t coordinate points (x1,y1) place modulated before field strength, E*(x1,y1,t) It is E (x1,y1, t) conjugation item, I1(x1,y1, t) and it is light beam II in t coordinate points (x1,y1) place modulated before light intensity；Bucket detector (4) in the total light intensity value that t detects is：I2(t)=<E*(x2,y2,t)E(x2,y2, t) and ＞=∫obj|E(xs,ys,t)h(xs,ys,x2,y2)T(x2,y2,t)|2dx2dy2；In above formula, (xs,ys) represent on light source a bit, (x2,y2) represent on object to be imaged a bit, E (xs,ys, t) be In t light source coordinates point (xs,ys) place field strength, E (x2,y2, t) and it is light beam I in t coordinate points (x2,y2) place field strength, E*(x2,y2, t) and it is E (x2,y2, t) conjugation item, h (xs,ys,x2,y2) be light wave from light source into bucket detector communication process Impulse response function, T (x2,y2, t) be object to be imaged aperture function, I2(t) it is that a barrel detector (4) detects in t Total light intensity value；3) internal modulator (6) is carried in the output signal of bucket detector (4) in the control unit of structure hot spot emission source (1) real Now to light beam II intensity modulated, or, external modulator (7) is used for real after the output signal of a barrel detector (4) acquisition is obtained Now to light beam II intensity modulated, after light beam II is modulated by internal modulator (6) or external modulator (7), the multiplication meter of light is completed Calculate I1(x1,y1,t)×I2(t), transmit afterwards to optical information processing system (8) carry out bandpass filtering enhancing processing after transmit to The photosensitive object of low speed (10)；4) the photosensitive object of low speed (10) carries out time integral calculating automatically, realizes that ensemble average calculates as the following formula：<mrow> <msup> <mi>G</mi> <mrow> <mo>(</mo> <mn>2</mn> <mo>)</mo> </mrow> </msup> <mrow> <mo>(</mo> <msub> <mi>x</mi> <mn>1</mn> </msub> <mo>,</mo> <msub> <mi>y</mi> <mn>1</mn> </msub> <mo>)</mo> </mrow> <mo>=</mo> <msubsup> <mo>&Integral;</mo> <mi>t</mi> <mrow> <mi>t</mi> <mo>+</mo> <mi>T</mi> </mrow> </msubsup> <msub> <mi>I</mi> <mn>1</mn> </msub> <mrow> <mo>(</mo> <msub> <mi>x</mi> <mn>1</mn> </msub> <mo>,</mo> <msub> <mi>y</mi> <mn>1</mn> </msub> <mo>,</mo> <mi>t</mi> <mo>)</mo> </mrow> <msub> <mi>I</mi> <mn>2</mn> </msub> <mrow> <mo>(</mo> <mi>t</mi> <mo>)</mo> </mrow> <mi>d</mi> <mi>t</mi> <mo>;</mo> </mrow>In above formula, I1(x1,y1, t) and represent t coordinate points (x on light beam II1,y1) light intensity, I2(t) spy of t bucket is represented The total light intensity value detected is surveyed on device (4), and T represents the low speed photosensitive object retentivity time of eye.
- 6. imaging method according to claim 5, it is characterised in that：Described optical information processing system (8) uses 4f System realizes that bandpass filtering removes the back end of image and the enhancing of image.
- 7. imaging method according to claim 5, it is characterised in that：Described structure hot spot emission source (1) utilizes The control of Matlab softwares produces Hadamard structure speckles, and is projected by digital micromirror array equipment DMD.
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| CN110308614A (en) * | 2018-03-20 | 2019-10-08 | 中国科学院物理研究所 | The method and apparatus of X-ray intensity relevance imaging |
| CN108683458A (en) * | 2018-05-22 | 2018-10-19 | 华中科技大学 | A kind of time domain ghost imaging device and method based on orthogonal frequency division multiplexing |
| WO2020019204A1 (en) * | 2018-07-25 | 2020-01-30 | 合刃科技（深圳）有限公司 | System and method for detecting stealthy object |
| CN109946753A (en) * | 2019-03-15 | 2019-06-28 | 西安交通大学 | The coded system and method for ghost imaging are calculated based on low order Hadamard basic vector |
| CN109946753B (en) * | 2019-03-15 | 2020-04-28 | 西安交通大学 | Encoding method for calculating ghost imaging based on low-order Hadamard basis vector |
| CN110097634B (en) * | 2019-04-19 | 2022-09-20 | 南京理工大学 | Self-adaptive multi-scale three-dimensional ghost imaging method |
| CN110097634A (en) * | 2019-04-19 | 2019-08-06 | 南京理工大学 | A kind of terrible imaging method of the three-dimensional of self-adapting multi-dimension |
| CN110319790A (en) * | 2019-04-23 | 2019-10-11 | 首都师范大学 | A kind of terrible imaging method of full color calculating based on colored speckle field |
| CN110243398A (en) * | 2019-06-27 | 2019-09-17 | 南京邮电大学 | A kind of relevance imaging method of the phase object based on relevant detection |
| CN110243398B (en) * | 2019-06-27 | 2021-04-20 | 南京邮电大学 | Coherent detection-based phase object correlation imaging method |
| CN111257908B (en) * | 2020-01-20 | 2022-04-26 | 成都仲伯科技有限公司 | High-dimensional detection method based on optical synchronization |
| CN111257908A (en) * | 2020-01-20 | 2020-06-09 | 成都仲伯科技有限公司 | High-dimensional detection method based on optical synchronization |
| CN111551955A (en) * | 2020-06-22 | 2020-08-18 | 北京理工大学 | Bionic blocking ghost imaging method and system |
| CN112904364A (en) * | 2021-01-19 | 2021-06-04 | 湖南大学 | Correlation imaging scheme of hollow Gaussian modulation source under atmospheric turbulence |
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