CN106646512A - Ghost imaging method and ghost imaging system based on bionic vision mechanism - Google Patents
Ghost imaging method and ghost imaging system based on bionic vision mechanism Download PDFInfo
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Abstract
The invention relates to a ghost imaging method and a ghost imaging system based on a bionic vision mechanism, and belongs to the photoelectric imaging field. A laser source, a collimating lens, a rotary frosted glass, and a spectroscope are respectively disposed on the same optical path sequentially. The laser source, the collimating lens, and the rotary frosted glass are used to generate parallel pseu-dothermal light required by the ghost imaging. The spectroscope is used to divide the pseu-dothermal light into two optical paths, and reflection light is a reference arm optical path, and transmission light is a detection arm optical path. The light intensity distribution of the reference arm optical path is received by a bionic detector array, and pseu-dothermal light source two-dimensional light intensity distribution information is completed. After the light of the detection arm is irradiated on a target, the light is reflected, and then the light is reflected by the spectroscope, and the reflection light total light intensity is received by a barrel detector, and the target reflection light total light intensity information acquisition is completed. A related arithmetic unit is used for the operation of the information acquired by the bionic detector array and the barrel detector. The bionic variable resolution detector array is adopted, and large visual field, high resolution imaging and fast imaging are realized at the same time.
Description
Technical field
The present invention relates to a kind of terrible imaging method and system based on bionic visual mechanism, belongs to photoelectronic imaging field.
Background technology
With the continuous lifting of computer disposal speed, compare more traditional photoelectric imaging technology, calculate imaging technique because
To optical imaging device require it is low, can realize super-resolution imaging, it is not affected by environment the advantages of, extensively made more and more
With.Wherein, it is imaged based on intensity correlation, i.e., terrible imaging method is a kind of novel photoelectric imaging method.The method be it is a kind of by
With reference arm indirectly to the system of target imaging, feeler arm is point probe to feeler arm, and reference arm adopts detector array, and
Majority uses (high-resolution) array type detector.Because the feeler arm comprising single point detector is only capable of obtaining single-point intensity
Information and also it cannot be imaged because reference arm will not cannot be contacted with target to target imaging, on the other hand, but when this two
Arm signal carries out second order computing cross-correlation, can be finally inversed by target information.From image-forming principle as can be seen that the imaging technique only has
Feeler arm includes target information, therefore its detection and being imaged separates so as to is not restricted by environment in actual use, is significantly carried
High operating flexibility, and the detection of thing arm is only completed using single pixel detector or bucket detector, is compared planar array detector and is had more
High sensitivity, or even can also be to target imaging under conditions of the low light level.Therefore, the technology still can be obtained under extreme conditions
Target information is obtained, potential using value of the imaging system at the aspect such as basic research and national defense industry is shown.
At present, it is to be difficult to while realizing big visual field, high score based on the terrible imaging method difficult point of intensity correlation imaging technique
Resolution is imaged and fast imaging.Traditional ghost imaging method when increasing visual field or improving resolution ratio, more by increasing data volume reality
It is existing, thus can cause the reduction of imaging rate；Conversely, tradition ghost imaging method is when imaging rate is improved, more by reducing number
Realize according to amount, can often adopt the method for reducing imaging viewing field or reducing resolution ratio.Therefore, how simultaneously big visual field, high score to be realized
Resolution is imaged and fast imaging, needs a kind of new method of proposition badly.
With bionic continuous development, human eye retina's characteristic provides new thinking to solve this problem.Human eye
From inside to outside, photosensory cell size gradually increases the photosensory cell of retina, i.e., resolution ratio is gradually reduced, can around visual field sight
Observation of eyes mark, also can central visual field high-resolution stare object observing, meanwhile, human eye for central vision energy high-resolution imaging,
The characteristics of there is down redundant data for surrounding visual field (non-field of view of interest) so that human eye has higher responsiveness and spirit
Sensitivity.Can be the big visual field of demand, high-resolution simultaneously in consideration of it, using the feature, designing variable resolution detector array architecture
The terrible imaging applications of imaging and fast imaging provide a kind of brand-new technological approaches.
The content of the invention
The invention aims to while realizing the problem of big visual field, high-resolution imaging and fast imaging, there is provided one
Plant the terrible imaging method and system based on bionic visual mechanism.
The purpose of the present invention is achieved through the following technical solutions.
A kind of terrible imaging method based on bionic visual mechanism, comprises the following steps that：
Step one, with bucket detector collection light source be irradiated to the reflected light total light intensity information after target；Use bionical spy simultaneously
Survey the two-dimensional illumination intensity distribution information of device array acquisition same light source.
Step 2, the computing for carrying out based on bionic visual mechanism, obtain feature of interest：
Wherein, bionic detection device array, including the variable resolution determined resolution and be made up of variable resolution pixel
Region.
Variable resolution dot structure in variable resolution region is：Pixel internal diameter is ri-1, pixel external diameter is ri, outside pixel
The distance between footpath and pixel internal diameter are h, and the internal diameter arc length of the pixel is wi-1, external diameter arc length w of the pixeli.Variable resolution picture
Plain starting ring radius is r0.According to human eye retina's characteristic, mathematic(al) representation is as follows：
In formula (1), i be bionic detection device the i-th ring of array, N be bionic detection device array in each ring pixel count, r0
For variable resolution pixel starting ring radius in bionic detection device array, q is the growth in bionic detection device array between adjacent ring
Rate.
The light source of step one is constantly adjusted, after M measurement, M groups target reflecting light total light intensity information and light is obtained
Source two-dimensional illumination intensity distribution information；Target reflecting light total light intensity information and light source two-dimensional illumination intensity distribution information are calculated, is obtained
The topography measurement value of target is：
When light source to objective plane apart from d1With light source to bionic detection device array plane apart from d it is equal when, through M
After secondary measurement, the topography measurement value of target is：
In formula (2), g (r, θ) be polar coordinate system under target reconstruction function, Δ Z1For on bucket detector total light intensity it is flat
Equal deviation, Δ Z2(r, θ) is the average deviation of point (r, θ) place light intensity on bionic detection device array under polar coordinate system,<.>Represent M
The mean operation of secondary iteration；λ is optical source wavelength, and d is distance of the light source to bionic detection device array plane, and t (r, θ) is polar coordinates
The lower objective plane reflectivity function of system.
In formula (2), the average deviation Δ Z of total light intensity on bucket detector1Computational methods are：
Wherein,For total light intensity Z on M bucket detector1The mean value of measured value.
In formula (2), the average deviation Δ Z of point (r, θ) place light intensity on bionic detection device array2(r, θ) computational methods are：
Wherein, Z in formula (4)2(r, θ) is the light intensity at point (r, θ) place on bionic detection device array, and (r, θ) exists for the point
Coordinate representation in correspondence polar coordinate system,Represent light intensity Z at point (r, θ) place on M bionic detection device array2(r,θ)
The mean value of measured value.
When light source to objective plane apart from d1With light source to bionic detection device array plane apart from d it is unequal when, Jing
After crossing M measurement, the topography measurement value of target is：
In formula (5),
To sum up, according to formula (2)-(6), after M measurement, you can restore the topography measurement value of target, that is, realize
Ghost imaging.
A kind of terrible imaging system based on bionic visual mechanism, including LASER Light Source, collimation lens, rotating ground glass is imitated
Raw detector array, target, spectroscope, bucket detector and correlation operator.
Annexation：
LASER Light Source, collimation lens, rotating ground glass and spectroscope are sequentially located in order in same light path；Laser light
Source, collimation lens and rotating ground glass are used to produce the parallel counterfeit hot light needed for ghost imaging；Spectroscope is then used for counterfeit hot light point
Into two light paths, reflected light is reference arm light path；Transmitted light is feeler arm light path.The light distribution of reference arm light path is by bionical spy
Device array received is surveyed, counterfeit thermal light source two-dimensional illumination intensity distribution information gathering is completed；The illumination of feeler arm light path is incident upon target back reflection,
Again through spectroscopical reflection, reflected light total light intensity is received by bucket detector, completes target reflecting light total light intensity information gathering.Phase
Close arithmetic unit carries out computing by the information that bionic detection device array and bucket detector are gathered.
Based on above-mentioned annexation, System Working Principle is expanded on further：
LASER Light Source sends beam of laser, and through collimation lens, rotating ground glass, spectroscope two light paths are divided into, reflection
By bionic detection device array received, transmitted light beam exposes to target to the two-dimensional illumination intensity distribution of light beam, and the reflected light of target is through dividing
The reflection of light microscopic, the total light intensity of reflected light is received by bucket detector.The photosignal of bionic detection device array and bucket detector, Jing
After crossing the computing cross-correlation of correlation operator, single measurement result is obtained.After duplicate measurements M time, you can obtain the pattern of target
Information.
The course of work is as follows：
(1) LASER Light Source sends and exposed on rotating ground glass after the collimated lens of beam of laser, produces counterfeit hot light.
(2) the counterfeit hot light for generating is divided into two-way light beam through spectroscope, and wherein transmitted light is feeler arm light beam, and reflected light is
Reference arm light beam.Wherein, feeler arm light beam is exposed in target, and, through spectroscopical reflection, its total light intensity is by bucket for its reflected light
Detector is received；Reference arm light beam two-dimensional illumination intensity distribution is by bionic detection device array received.
(3) bionic detection device array and the photosignal of bucket detector collection enter correlation operator, and correlation operator enters
Row related operation, and duplicate measurements M time, you can obtain measurement result, reconstruct the pattern of target.
Beneficial effect
(1) a kind of calculating ghost imaging method and system based on bionic visual mechanism disclosed by the invention, using bionical change
Resolution detector array, can simultaneously realize big visual field, high-resolution imaging and fast imaging.
(2) a kind of calculating ghost imaging method and system based on bionic visual mechanism disclosed by the invention, using bionical change
The high-resolution feature of resolution detector central detector array, is capable of achieving center high-resolution imaging.
(3) a kind of calculating ghost imaging method and system based on bionic visual mechanism disclosed by the invention, by bionical change
The variable resolution feature of resolution detector periphery detector array, is capable of achieving the compression to visual field periphery, improves data transfer
Efficiency, so as to realize large viewing field condition under fast imaging.
Description of the drawings
Fig. 1 system construction drawings；
Fig. 2 bionic detection device array structures；
Fig. 3 becomes resolution dot structure.
1- LASER Light Sources, 2- collimation lenses, 3- rotating ground glass, 4- bionic detection device arrays, 5- targets, 6- spectroscopes,
7- bucket detectors, 8- correlation operators, 9- becomes resolution pixel, and 10- differentiates region surely, and 11- becomes resolution region, 12- variable resolutions
Dot structure.
Specific embodiment
The specific embodiment of the present invention is illustrated below in conjunction with accompanying drawing.
Embodiment 1
A kind of terrible imaging method based on bionic visual mechanism, comprises the following steps that：
Step one, with bucket detector collection light source be irradiated to the reflected light total light intensity information after target；Use bionical spy simultaneously
Survey the two-dimensional illumination intensity distribution information of device array acquisition same light source.
Step 2, the computing for carrying out based on bionic visual mechanism, obtain feature of interest：
Wherein, bionic detection device array, including the variable resolution determined resolution and be made up of variable resolution pixel
Region.
Variable resolution dot structure in variable resolution region is：Pixel internal diameter is ri-1, pixel external diameter is ri, outside pixel
The distance between footpath and pixel internal diameter are h, and the internal diameter arc length of the pixel is wi-1, external diameter arc length w of the pixeli.Variable resolution picture
Plain starting ring radius is r0.According to human eye retina's characteristic, mathematic(al) representation is as follows：
In formula (1), i be bionic detection device the i-th ring of array, N be bionic detection device array in each ring pixel count, r0
For variable resolution pixel starting ring radius in bionic detection device array, q is the growth in bionic detection device array between adjacent ring
Rate.
The light source of step one is constantly adjusted, after M measurement, M groups target reflecting light total light intensity information and light is obtained
Source two-dimensional illumination intensity distribution information；Target reflecting light total light intensity information and light source two-dimensional illumination intensity distribution information are calculated, is obtained
The topography measurement value of target is：
When light source to objective plane apart from d1With light source to bionic detection device array plane apart from d it is equal when, through M
After secondary measurement, the topography measurement value of target is：
In formula (2), g (r, θ) be polar coordinate system under target reconstruction function, Δ Z1For on bucket detector total light intensity it is flat
Equal deviation, Δ Z2(r, θ) is the average deviation of point (r, θ) place light intensity on bionic detection device array under polar coordinate system,<.>Represent M
The mean operation of secondary iteration；λ is optical source wavelength, and d is distance of the light source to bionic detection device array plane, and t (r, θ) is polar coordinates
The lower objective plane reflectivity function of system.
In formula (2), the average deviation Δ Z of total light intensity on bucket detector1Computational methods are：
Wherein,For total light intensity Z on M bucket detector1The mean value of measured value.
In formula (2), the average deviation Δ Z of point (r, θ) place light intensity on bionic detection device array2(r, θ) computational methods are：
Wherein, Z in formula (4)2(r, θ) is the light intensity at point (r, θ) place on bionic detection device array, and (r, θ) exists for the point
Coordinate representation in correspondence polar coordinate system,Represent light intensity Z at point (r, θ) place on M bionic detection device array2(r,θ)
The mean value of measured value.
When light source to objective plane apart from d1With light source to bionic detection device array plane apart from d it is unequal when, Jing
After crossing M measurement, the topography measurement value of target is：
In formula (5),
To sum up, according to formula (2)-(6), after M measurement, you can restore the topography measurement value of target, that is, realize
Ghost imaging.
Embodiment 2
A kind of terrible imaging system based on bionic visual mechanism, as shown in figure 1, including LASER Light Source 1, collimation lens 2, rotation
Turn frosted glass 3, bionic detection device array 4, target 5, spectroscope 6, bucket detector 7 and correlation operator 8.
Annexation：
LASER Light Source 1, collimation lens 2, rotating ground glass 3 and spectroscope 6 are sequentially located in order in same light source light path；
LASER Light Source 1, collimation lens 2 are used to produce the parallel counterfeit hot light needed for ghost imaging with rotating ground glass 3；Spectroscope 6 is then used for
Counterfeit hot light is divided into two light paths, reflected light is reference arm light path, and transmitted light is feeler arm light path.The light intensity of reference arm light path point
Cloth is received by bionic detection device array 4, completes counterfeit thermal light source two-dimensional illumination intensity distribution information gathering；The illumination of feeler arm light path is incident upon
The back reflection of target 5, then through the reflection of spectroscope 6, its total light intensity information is received by bucket detector 7, completes the reflected light of target 5 total
Intensity signal is gathered.The information that bionic detection device array 4 and bucket detector 7 are gathered is carried out related operation by correlation operator 8.
Based on above-mentioned annexation, System Working Principle is expanded on further：
LASER Light Source 1 sends beam of laser, through collimation lens 2, rotating ground glass 3,6 points of spectroscope be two light paths,
The two-dimensional illumination intensity distribution of the reflected beams is received by bionic detection device array 4, and transmitted light beam exposes to target 5, the reflected light of target 5
Through the reflection of spectroscope 6, its total light intensity information is received by bucket detector 7.The light of bionic detection device array 4 and bucket detector 7
Electric signal, after the computing cross-correlation of correlation operator 8, obtains single measurement result.After duplicate measurements M time, you can obtain
The topographical information of target 5.
The course of work is as follows：
It is divided into transmitted light feeler arm light after the collimated lens 2 of step one, LASER Light Source 1, rotating ground glass 3 and spectroscope 6
Road and reflected light reference arm light path, again Jing spectroscopes 6 are anti-to be irradiated to the back reflection of target 5 with the collection feeler arm light of bucket detector 7
The total light intensity information penetrated, completes the reflected light total light intensity information gathering of target 5；Gather reference arm with bionic detection device array 4 simultaneously
The two-dimensional illumination intensity distribution information of light path, completes the two-dimensional illumination intensity distribution information gathering of same light source.
Step 2, the related operation based on bionic visual mechanism is carried out using correlation operator 8, obtain the pattern of target 5：
Wherein, bionic detection device array 4, array structure as shown in Fig. 2 including determine resolution 10 and by become differentiate
The variable resolution region 11 that rate pixel 9 is constituted.
Variable resolution region 11 meets human eye retina's characteristic.As shown in figure 3, in variable resolution dot structure 12, O is
The center of circle of bionic detection device array 4, A, B, C, D for variable resolution pixel four summits, radius OA and OB, i.e. pixel internal diameter is
ri-1；Radius OC and OD, i.e. pixel external diameter are ri；The distance between BC, i.e. pixel internal diameter and pixel external diameter are h；Arc length AB, i.e.,
The internal diameter arc length of pixel is wi-1；External diameter arc length w of arc length CD, i.e. pixeli.Variable resolution pixel starting ring radius is r0.According to
Human eye retina's characteristic, mathematic(al) representation is as follows：
In formula (1), i is the ring of bionic detection device array 4 i-th, and N is the pixel count of each ring in bionic detection device array 4,
r0For variable resolution pixel starting ring radius in bionic detection device array 4, q is between adjacent ring in bionic detection device array 4
Growth rate.
The rotating ground glass 3 of step one is constantly rotated, after M measurement, the total light of reflected light of M groups target 5 is obtained
The two-dimensional illumination intensity distribution information of strong information and reference arm；Two-dimentional light intensity point to the reflected light total light intensity information of target 5 and reference arm
Cloth information carries out correlation computations, and the topography measurement value for obtaining target 5 is：
When LASER Light Source 1 to the plane of target 5 is apart from d1With LASER Light Source 1 to the plane of bionic detection device array 4 apart from d
When equal, after M measurement, the topography measurement value of target 5 is：
In formula (2), g (r, θ) be polar coordinate system under target 5 reconstruction function, Δ Z1For total light intensity on bucket detector 7
Average deviation, Δ Z2(r, θ) is the average deviation of point (r, θ) place light intensity on bionic detection device array 4 under polar coordinate system,<.>Table
Show the mean operation of M iteration；λ is optical source wavelength, and d is distance of the LASER Light Source 1 to the plane of bionic detection device array 4, t (r,
It is θ) the plane reflection rate function of target 5 under polar coordinate system.
In formula (2), the average deviation Δ Z of total light intensity on bucket detector 71Computational methods are：
Wherein,For total light intensity Z on M bucket detector 71The mean value of measured value.
In formula (2), the average deviation Δ Z of point (r, θ) place light intensity on bionic detection device array 42(r, θ) computational methods
For：
Wherein, Z in formula (4)2(r, θ) is the light intensity at point (r, θ) place on bionic detection device array 4, and (r, θ) exists for the point
Coordinate representation in correspondence polar coordinate system,Represent light intensity Z at point (r, θ) place on M bionic detection device array 42(r,
θ) the mean value of measured value.
When LASER Light Source 1 to the plane of target 5 is apart from d1With LASER Light Source 1 to the plane of bionic detection device array 4 apart from d
When unequal, after M measurement, the topography measurement value of target 5 is：
In formula (5),
To sum up, according to formula (2)-(6), after M measurement, you can restore the topography measurement value of target 5.
Wherein, bionic detection device array 4 is determined the row of resolution 10 gating and is read in pixel readout, becomes and differentiates
The ring gating of rate region 11 reads.
Presently preferred embodiments of the present invention is these are only, protection scope of the present invention is not intended to limit.It is all at this
Within bright spirit and principle, any modification, equivalent substitution and improvements made etc. should be included in protection scope of the present invention
Within.
Claims (3)
1. a kind of terrible imaging method based on bionic visual mechanism, it is characterised in that：Comprise the following steps that：
Step one, collection light source are irradiated to the reflected light total light intensity information after target；It is simultaneously same with bionic detection device array acquisition
The two-dimensional illumination intensity distribution information of one light source；
Step 2, the computing for carrying out based on bionic visual mechanism, obtain feature of interest：
Wherein, bionic detection device array, including the variable resolution region determined resolution and be made up of variable resolution pixel；
Variable resolution dot structure in variable resolution region is：Pixel internal diameter is ri-1, pixel external diameter is ri, pixel external diameter and picture
The distance between plain internal diameter is h, and the internal diameter arc length of the pixel is wi-1, external diameter arc length w of the pixeli；The starting of variable resolution pixel
Ring radius is r0；According to human eye retina's characteristic, mathematic(al) representation is as follows：
In formula (1), i be bionic detection device the i-th ring of array, N be bionic detection device array in each ring pixel count, r0It is imitative
Variable resolution pixel starting ring radius in raw detector array, q is the growth rate in bionic detection device array between adjacent ring；
The light source of step one is constantly adjusted, after M measurement, M groups target reflecting light total light intensity information and light source two is obtained
Dimension light distribution information；Target reflecting light total light intensity information and light source two-dimensional illumination intensity distribution information are calculated, target is obtained
Topography measurement value be：
When light source to objective plane apart from d1With light source to bionic detection device array plane apart from d it is equal when, through M time survey
After amount, the topography measurement value of target is：
In formula (2), g (r, θ) be polar coordinate system under target reconstruction function, Δ Z1For on bucket detector total light intensity it is average partially
Difference, Δ Z2(r, θ) is the average deviation of point (r, θ) place light intensity on bionic detection device array under polar coordinate system,<.>Represent M time repeatedly
The mean operation in generation；λ is optical source wavelength, and d is distance of the light source to bionic detection device array plane, and t (r, θ) is under polar coordinate system
Objective plane reflectivity function；
In formula (2), the average deviation Δ Z of total light intensity on bucket detector1Computational methods are：
Wherein,For total light intensity Z on M bucket detector1The mean value of measured value；
In formula (2), the average deviation Δ Z of point (r, θ) place light intensity on bionic detection device array2(r, θ) computational methods are：
Wherein, Z in formula (4)2(r, θ) is the light intensity at point (r, θ) place on bionic detection device array, and (r, θ) is the point in correspondence pole
Coordinate representation in coordinate system,Represent light intensity Z at point (r, θ) place on M bionic detection device array2(r, θ) measured value
Mean value；
When light source to objective plane apart from d1With light source to bionic detection device array plane apart from d it is unequal when, through M time
After measurement, the topography measurement value of target is：
In formula (5),
To sum up, according to formula (2)-(6), through M time measurement after, you can restore the topography measurement value of target, that is, realize ghost into
Picture.
2. a kind of terrible imaging method based on bionic visual mechanism as claimed in claim 1, it is characterised in that：Collection light source shines
It is mapped to the reflected light total light intensity information after target and uses a barrel detector.
3. a kind of terrible imaging system based on bionic visual mechanism, it is characterised in that：Including：LASER Light Source, collimation lens, rotation
Frosted glass, bionic detection device array, target, spectroscope, bucket detector and correlation operator；
LASER Light Source, collimation lens, rotating ground glass and spectroscope are sequentially located in order in same light path；LASER Light Source, standard
Straight lens are used to produce the parallel counterfeit hot light needed for ghost imaging with rotating ground glass；Spectroscope is then used to for counterfeit hot light to be divided into two
Light path, reflected light is reference arm light path；Transmitted light is feeler arm light path；The light distribution of reference arm light path is by bionic detection device battle array
Row are received, and complete counterfeit thermal light source two-dimensional illumination intensity distribution information gathering；The illumination of feeler arm light path is incident upon target back reflection, then passes through
Spectroscopical reflection, reflected light total light intensity is received by bucket detector, completes target reflecting light total light intensity information gathering；Related operation
The information that bionic detection device array and bucket detector are gathered is carried out computing by device.
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| CN113240610A (en) * | 2021-05-27 | 2021-08-10 | 清华大学深圳国际研究生院 | Double-channel ghost imaging reconstruction method and system based on human eye simulation mechanism |
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