CN105674923B - Super-resolution imaging method and its realization device based on Fresnel zone plates coding - Google Patents
Super-resolution imaging method and its realization device based on Fresnel zone plates coding Download PDFInfo
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- CN105674923B CN105674923B CN201610006319.4A CN201610006319A CN105674923B CN 105674923 B CN105674923 B CN 105674923B CN 201610006319 A CN201610006319 A CN 201610006319A CN 105674923 B CN105674923 B CN 105674923B
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- G01B15/00—Measuring arrangements characterised by the use of electromagnetic waves or particle radiation, e.g. by the use of microwaves, X-rays, gamma rays or electrons
- G01B15/04—Measuring arrangements characterised by the use of electromagnetic waves or particle radiation, e.g. by the use of microwaves, X-rays, gamma rays or electrons for measuring contours or curvatures
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Abstract
The invention discloses a kind of super-resolution imaging methods and its realization device based on Fresnel zone plates coding, solve the problems, such as that existing Fresnel zoneplate coded imagings mode cannot obtain the object to be measured image with super-resolution.The present invention includes the following steps：(1) make notch using Fresnel zone plates and coded imaging is carried out to object to be measured, obtain the code pattern of object to be measured object；(2) it uses the transmittance function of the m rank Gabor zone plates of Fresnel zone plates to carry out the recovery of code pattern, obtains the original image of the object to be measured of super-resolution；m>0.Present inventive concept is reasonable, ingenious in design, applied widely, it by the transmittance function of the m rank Gabor zone plates of Fresnel zone plates by carrying out the recovery of code pattern, to break the limitation of Rayleigh criterion, the super-resolution imaging of object to be measured is realized well.
Description
Technical field
The present invention relates to high-energy radiation imaging fields, and in particular to be it is a kind of encoded based on Fresnel zone plates it is super
Resolution imaging method and its realization device.
Background technology
Zoneplate coded imaging technology be it is a kind of by single exposure obtain target three-dimensional information imaging technique, 1961
It is proposed by Mertz and Young.Currently, the technology is widely used in astronomy, nuclear medicine and laser inertial confinement fusion research etc.
The attention of the application and development especially attraction people in the field (ICF) is studied in field in inertial confinement fusion.
In ICF, symmetry, uniformity and the implosion of driving radiation source can be obtained by implosion constricted zone image
The important physicals information such as plasma compression hydrodynamic instability growth.It is traditional in particle and strong X-ray radiant image
Imaging method (such as reflect, reflect) is not easy to obtain the imaging of high quality.In contemporary ICF, when target parameter and laser irradiation ginseng
When number is fully optimized, the neutron yield of radiation-driven implosion experiment is smaller, and charged particle imaging is under this dosage
Sub- imaging technique is hard to work, is being preferably selected for implosion constricted zone imaging using X-ray imaging means.Conventional X-ray pin hole
Imaging has small receipts light solid angle, to small throughput X-ray radiation (the hard X-ray flux of implosion constricted zone is usually smaller) imaging
It is not largely effective.Similar to Wolter microscopes, receipts light can be significantly increased in the microscopical glancing incidence reflection units of K-B
Efficiency, it is expected to obtain the x-ray image of high-resolution high s/n ratio, but this kind of device technique difficulty is larger, use cost is high.
With zoneplate coded imaging technology people are encountered during carrying out high-temperature high-density plasma diagnosis
The various specific questions effect that is resolved, and has obtained.
It is well known that spatial resolution be weigh image device performance one of important indicator, but Fresnel zone plates at
The spatial resolution of picture is limited by the outermost ring width Δ r of zone plate, i.e., can only object of the resolution size more than 1.22 Δ r.
Therefore, under the limitation of Rayleigh criterion, traditional Fresnel zoneplate coded imaging methods are difficult to realize the oversubscription of object to be measured
Distinguish imaging.
Invention content
In view of the above shortcomings of the prior art, the present invention provides a kind of super-resolution based on Fresnel zone plates coding
Imaging method and its realization device can break through the limitation of Rayleigh criterion, to obtain the super-resolution imaging of object to be measured.
To achieve the above object, the technical solution adopted by the present invention is as follows：
Based on the super-resolution imaging method of Fresnel zone plates coding, include the following steps：
(1) make notch using Fresnel zone plates and coded imaging is carried out to object to be measured, obtain the volume of object to be measured object
Code figure；
(2) it uses the transmittance function of the m rank Gabor zone plates of Fresnel zone plates to carry out the recovery of code pattern, obtains
To the original image of the object to be measured of super-resolution；m>0.
Specifically, the transmittance function representation formula of the Gabor zone plates is as follows：
Wherein, m is the m rank Gabor zone plates corresponding to Fresnel zone plates, and r is the m rings of Fresnel zone plates
Radius, r1For the first ring radius of Fresnel zone plates.
Based on the above method, the present invention also provides three kinds of devices for realizing the super-resolution imaging method, as follows respectively：
Device one
It includes Fresnel zone plates, cameras record medium and image restoration display terminal, wherein：
Fresnel zone plates, for being generated to laser-produced fusion and the α particle pictures escaped from fusion target core encode；
Cameras record medium, the code pattern for obtaining α particle pictures；
Image restoration display terminal is obtained for being restored to code pattern according to the mode of (2) the step of the above method
Laser-produced fusion thermonuclear reaction area image with super-resolution.
Further, the cameras record medium is LR-115 type high sensitivity solid state nuclear track detectors.
Device two
It includes Fresnel zone plates, γ cameras and image restoration display terminal, wherein：
Fresnel zone plates, for being encoded to the image that can emit gamma-ray object under test；
γ cameras, the code pattern for obtaining object under test image；
Image restoration display terminal is obtained for being restored to code pattern according to the mode of (2) the step of the above method
Object under test image with super-resolution.
Device three
It includes Fresnel zone plates, collimator, X-ray detector and image restoration display terminal, wherein：
Fresnel zone plates, the radioscopic image sent out for measuring targets are encoded；
Collimator is beaten for the X-ray after encoding in X-ray detector；
X-ray detector, the code pattern for obtaining radioscopic image；
Image restoration display terminal is obtained for being restored to code pattern according to the mode of (2) the step of the above method
Object under test radioscopic image with super-resolution.
Compared with prior art, the invention has the advantages that：
(1) present inventive concept is reasonable, ingenious in design, on the basis of theory and practice combines, utilizes Fresnel wavestrips
The transmittance functions of the m rank Gabor zone plates of piece carries out the recovery of code pattern, to break the limitation of Rayleigh criterion,
Realize the super-resolution imaging of object to be measured.According to test statistics, the original image that the present invention restores is directly to use
M times of the resolution ratio for the original image that Fresnel zone plates are restored, advantage is clearly.
(2) on the basis of the present invention is based on designed super-resolution imaging method, pass through rational structure design so that this hair
Bright designed device out can be widely applied to the fields such as astronomy, nuclear medicine and laser inertial confinement fusion research, because
And the scope of application is very extensive, has very high practical value and promotional value.
Description of the drawings
Fig. 1 is the flow diagram of the present invention.
Fig. 2 is the coded imaging schematic diagram of the present invention.
Fig. 3 is original image and Fresnel zone plate of the one of which of the present invention for the object of imaging.
Fig. 4 is obtained original image after object coding figure and its recovery in Fig. 3.
Fig. 5 is the 1st rank Gabor zone plates and the original image that recovery obtains.
Fig. 6 is the 3rd rank Gabor zone plates and the original image that recovery obtains.
Fig. 7 is the 5th rank Gabor zone plates and the original image that recovery obtains.
Fig. 8 is the 15th rank Gabor zone plates and the original image that recovery obtains.
Fig. 9 is a kind of structural schematic diagram of device of the present invention.
Figure 10 is the structural schematic diagram of another device of the present invention.
Figure 11 is the structural schematic diagram of the third device of the invention.
Wherein, reference numeral is corresponding entitled：
1-Fresnel zone plates, 2- cameras record media, 3- image restoration display terminals, 4- γ cameras, 5- collimators,
6-X ray detectors, 7- objects under test.
Specific implementation mode
The invention will be further described with embodiment for explanation below in conjunction with the accompanying drawings, and mode of the invention includes but not only limits
In following embodiment.
As shown in Figure 1, the present invention provides a kind of super-resolution imaging methods, Fresnel zone plate conducts are used first
Notch encodes target image, after obtaining code pattern, then use the high-order Gabor zone plates of Fresnel zone plates
Transmittance function carries out image restoration, to obtain the super-resolution imaging that can break Rayleigh criterion limitation.As shown in Fig. 2, this
The characteristics of invention is：Object is encoded using common Fresnel zone plates, the transmittance function of Fresnel zone plates can
To be expressed as：
Wherein, * indicates that the convolution of two functions, r are the m ring radiuses of Fresnel zone plates, r1For Fresnel wavestrips
First ring radius of piece,For the second ring radius.Above formula is made into Fourier expansion, can be obtained：
By suitably converting, can obtain：
The formula shows that Fresnel zone plates can be expressed as the linear combination of infinite multiple Gabor zone plates.Wherein,
The transmittance function of Gabor zone plates can be expressed as：
Wherein, m indicates the m rank Gabor zone plates corresponding to Fresnel zone plates, and in the present embodiment, it is described
Gabor zone plates can be sinusoidal pattern, longitudinal cosine type or other types of binaryzation Gabor zone plates.
For zoneplate coded imaging, it is assumed that original image is f (x, y), and the transmittance function of Fresnel zone plates is g
(x, y), then the code pattern after zone plate be represented by h (x, y)=f (x, y) * g (x, y).
After measuring code pattern, original image can get using following formula：
F (x, y)=F-1{F{h(x,y)}/F{g(x,y)}} (5)
Wherein, F { f (x, y) } indicates to carry out Fourier transformation, F to function f (x, y)-1{ f (x, y) } indicate to function f (x,
Y) inverse Fourier transform is carried out.Above formula shows that original image can be by Fu of the Fourier transformation and Fresnel zone plates of code pattern
In the inverse Fourier transform be divided by of leaf transformation obtain.
Here we use the transmittance function f of the m rank Gabor zone plates of Fresnel zone platesm(x, y) replaces former
The transmittance function g (x, y) of Fresnel zone plates, carries out the recovery of code pattern.
An example is given below, it was demonstrated that handled code pattern using this method, can get the original of super-resolution imaging
Beginning image.Assuming that original image is isosceles triangle, the length l of bottom is 10 μm；The annulus number of Fresnel zone plates is N
=50, the first ring radius is r1=150 μm, outermost ring width is r=10.6 μm of Δ (as shown in Figure 3).Due to l<1.22 Δ r,
According to Rayleigh criterion, clearly image can not be obtained through zone plate direct imaging.
Therefore, the code pattern of gained and original image such as Fig. 4 institutes by restoring acquisition after Fresnel zone plates
Show.As can be seen that directly being restored to Fresnel zone plate g (x, y), clearly original graph can not be obtained, because of original graph
The size of picture is too small, has been more than the limitation of Rayleigh criterion.
In the following, original Fresnel zone plate transmittance functions are replaced with the Gabor zone plates of each order respectively, it is right
Code pattern is restored, and the original image result of acquisition is as shown in Fig. 5,6,7 and 8.
When above-mentioned numerical simulation calculation is shown to being restored through the code pattern obtained by Fresnel zoneplate coded imagings,
When the order m of the Gabor zone plates of use obtains sufficiently high, the super-resolution imaging for breaking Rayleigh criterion limitation may be implemented.
This shows that the recovery that the Gabor zone plates by m ranks carry out code pattern is to improve the resolution ratio of the original image after restoring
Effective means, usually, the original image restored using the Gabor zone plates of m ranks are directly to be carried out with Fresnel zone plates
M times of the resolution ratio of the image of recovery.
Zoneplate coded imaging method proposed by the present invention can be widely applied for astronomy, nuclear medicine and laser inertia about
The fields such as beam fusion research.The device of above-mentioned super-resolution imaging method can be realized by being described in detail below, likewise, the present invention is real
The device of existing above-mentioned super-resolution imaging method includes but not limited to following several：
Device one
As shown in figure 9, the device includes Fresnel zone plates 1, cameras record medium 2 and image restoration display terminal 3.
The Fresnel zone plates 1 are for encoding α particle pictures, to reflect the symmetry and of implosion compressional zone
Even property feature.In ICF experiments, the α particles that laser-produced fusion generates first are escaped from fusion target core, the α particles warp then escaped
Notch (Fresnel zone plates) encodes.The cameras record medium 2 is used to obtain the code pattern of α particle pictures, this implementation
In example, which uses LR-115 type high sensitivity solid state nuclear track detectors.The image restoration display is eventually
End 3 is anti-to obtain the laser-produced fusion thermonuclear with super-resolution for being restored to code pattern according to above-mentioned imaging method
Answer area image.
Device two
As shown in Figure 10, which includes Fresnel zone plates 1, γ cameras 4 and image restoration display terminal 3.It is described to wait for
Gamma-rays can be emitted by surveying object 7, and the Fresnel zone plates 1 are placed on the side of object under test 7, for determinand
6 image of body is encoded.The γ cameras 4 are used to obtain the code pattern of object under test image.The image restoration is shown
Terminal 3 obtains the object under test image with super-resolution for being restored to code pattern according to above-mentioned imaging method.
Device three
As shown in figure 11, which includes that Fresnel zone plates 1, collimator 5, X-ray detector 6 and image restoration are aobvious
Show terminal 3.The Fresnel zone plates 1 are encoded for treating the radioscopic image that observation body is sent out.The collimation
X-ray after device 5 is used to encode is beaten in X-ray detector 6, the present embodiment, and 5 shape of collimator is honeycomb, is used
In count window of the support when internal pressure is reduced to 0, while being also used for limitation visual field.The X-ray detector 6 is for obtaining
Obtain the code pattern of radioscopic image.The image restoration display terminal 3 is then used to carry out code pattern according to above-mentioned imaging method
It restores, obtains the celestial body radioscopic image to be measured with super-resolution.
The present invention by the transmittance function of the m rank Gabor zone plates of Fresnel zone plates by replacing original Fresnel
The transmittance function of zone plate, then the algorithm of matching design carries out the recovery of code pattern, to realize mesh to be measured well
Target super-resolution imaging.Although the imaging method of the present invention seems simple, but be not easy to expect, is multiple with cleverly image
Former mode breaches the constraint of the prior art, to obtain unexpected technique effect, therefore, compared with prior art,
The present invention has substantive distinguishing features outstanding and significant progress.
Above-described embodiment is only one of the preferred embodiment of the present invention, should not be taken to limit the protection model of the present invention
It encloses, all body design thought in the present invention and that mentally makes have no the change of essential meaning or polishing is solved
Technical problem is still consistent with the present invention, should all be included within protection scope of the present invention.
Claims (6)
1. the super-resolution imaging method based on Fresnel zone plates coding, which is characterized in that include the following steps：
(1) make notch using Fresnel zone plates and coded imaging is carried out to object to be measured, obtain the coding of object to be measured object
Figure；
(2) it uses the transmittance function of the m rank Gabor zone plates of Fresnel zone plates to carry out the recovery of code pattern, is surpassed
The original image of the object to be measured of resolution ratio；m>0；The transmittance function representation formula of the Gabor zone plates is as follows：
Wherein, m is the m rank Gabor zone plates corresponding to Fresnel zone plates, and r is the m rings half of Fresnel zone plates
Diameter, r1For the first ring radius of Fresnel zone plates.
2. the super-resolution imaging method according to claim 1 based on Fresnel zone plates coding, which is characterized in that institute
It states in step (2), the original image of the object to be measured object of super-resolution is obtained using following formula：
F (x, y)=F-1{F{h(x,y)}/F{fm(x,y)}}
Wherein, f (x, y) indicates that original image, F { h (x, y) } indicate the Fourier transformation to code pattern, F { fm(x, y) } expression pair
The Fourier transformation of the m rank Gabor zone plates of Fresnel zone plates, F-1{ } indicates inverse Fourier transform.
3. a kind of device for realizing the method described in claim 2, which is characterized in that including Fresnel zone plates (1), camera
Recording medium (2) and image restoration display terminal (3), wherein：
Fresnel zone plates, for being generated to laser-produced fusion and the α particle pictures escaped from fusion target core encode；
Cameras record medium, the code pattern for obtaining α particle pictures；
Image restoration display terminal restores code pattern for the method according to claim 1 step (2), obtains
Laser-produced fusion thermonuclear reaction area image with super-resolution.
4. device according to claim 3, which is characterized in that the cameras record medium (2) is that LR-115 types are highly sensitive
Spend solid state nuclear track detector.
5. a kind of device for realizing the method described in claim 2, which is characterized in that including Fresnel zone plates (1), γ phases
Machine (4) and image restoration display terminal (3), wherein：
Fresnel zone plates, for being encoded to the image that can emit gamma-ray object under test；
γ cameras, the code pattern for obtaining object under test image；
Image restoration display terminal restores code pattern for the method according to claim 1 step (2), obtains
Object under test image with super-resolution.
6. a kind of device for realizing the method described in claim 2, which is characterized in that including Fresnel zone plates (1), collimation
Device (5), X-ray detector (6) and image restoration display terminal (3), wherein：
Fresnel zone plates, the radioscopic image sent out for measuring targets are encoded；
Collimator is beaten for the X-ray after encoding in X-ray detector；
X-ray detector, the code pattern for obtaining radioscopic image；
Image restoration display terminal restores code pattern for the method according to claim 1 step (2), obtains
Object under test radioscopic image with super-resolution.
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| CN107515465B (en) * | 2017-05-12 | 2019-06-28 | 中国工程物理研究院激光聚变研究中心 | A kind of spiral zoneplate coded imaging method generating edge enhanced images |
| CN108174503B (en) * | 2017-12-15 | 2019-09-20 | 中国科学院上海光学精密机械研究所 | Laser plasma electron density measurement method |
| CN111260557A (en) * | 2020-01-21 | 2020-06-09 | 中国工程物理研究院激光聚变研究中心 | Deep learning-based super-resolution imaging method for remote target |
| CN112198578A (en) * | 2020-10-30 | 2021-01-08 | 郑州大学 | Single-stage focusing spiral zone plate |
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