CN109934875A - Camera calibration peace field correction apparatus, camera calibration method and method for correcting flat field - Google Patents
Camera calibration peace field correction apparatus, camera calibration method and method for correcting flat field Download PDFInfo
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- CN109934875A CN109934875A CN201711365303.3A CN201711365303A CN109934875A CN 109934875 A CN109934875 A CN 109934875A CN 201711365303 A CN201711365303 A CN 201711365303A CN 109934875 A CN109934875 A CN 109934875A
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Abstract
The invention discloses a kind of camera calibration peace field correction apparatus, camera calibration method and method for correcting flat field, camera calibration peace field correction apparatus, comprising: camera bellows；Light source generator comprising LED light source and the optical fiber being attached thereto；Benchmark camera；Mobile station.Since camera calibration peace field correction apparatus is used as transmitting light source using intensity adjustable LED light source, detector of the benchmark camera as illumination light irradiance, camera and benchmark camera to be checked is mounted in moveable mobile station, the irradiation level of illumination light is adjusted between the brightness or adjusting camera to be checked and benchmark camera for enabling the present apparatus to pass through adjusting LED light source at a distance from LED light source, to realize the irradiation of different irradiation level, and benchmark camera is planar array detector, benchmark camera can also be used to the irradiation uniformity of detection illumination light, to which the present apparatus is made of more cheap component, and it is able to carry out quickly accurate camera calibration and flat field correction.
Description
Technical field
The present invention relates to camera imaging alignment technique fields, and in particular to camera calibration peace field correction apparatus, camera mark
Determine method and method for correcting flat field.
Background technique
Ideally, when the entire target surface uniform irradiation of the equal i.e. detector of the irradiation level that each pixel of camera receives,
It should be equal for obtaining the gray value of all pixels point in image.And actually for any CCD and CMOS camera, each picture
The gray value that element generates identical irradiation level is not identical, referred to as the Photo-Response Non-Uniformity of detector.Cause to respond non-homogeneous
Property the reason of include: that the CCD of camera or the structural material of CMOS chip itself and manufacturing process etc. have local otherness；Each picture
The spectral response functions of member are different；Read noise and the otherness of dark current noise etc..The purpose of flat field correction is exactly in correction
State heterogeneity.Camera calibration is to obtain one of the important means of quantitative relationship between camera output gray level and incident irradiance degree,
Incident irradiance degree can be finally inversed by by camera gray scale after obtaining calibration result.In the higher imaging neck of some pairs of image quality requirements
Domain and photometric measurement field, such as astronomical observation, remotely sensed image, photometric measurement, gene sequencing fluorescence imaging etc., need to camera
Carry out flat field correction and calibration.The response of this kind of camera detector is approximately linear, therefore most common method for correcting flat field is
Two point correction needs the scene of two different-energy grades of dark field (being protected from light) and light field, obtains the correction parameter of each pixel: increasing
Benefit and biasing, the flat field correction of any scene image can be realized using the parameter.Camera calibration can using two o'clock calibration and it is more
The modes such as point calibration, for responding linear detector, two o'clock calibration can be obtained detector response gray scale and projectile energy
Relationship.Multi-point calibration then facilitates to study the nonlinear response phenomenon of camera, can be used for the detection of camera response linearity and width
The flat field correction (multiple spot flat field correction) of dynamic range.
The key of camera calibration and flat field correction is to need brightness adjustable and be capable of the uniform source of light of real-time monitoring, existing
Light source is usually integrating sphere.Integrating sphere is the hollow spheres that an inner wall is coated with diffusive white reflective material, light quilt inside ball
It equably reflects and diffuses, form uniform light distribution on spherical surface, therefore the obtained light of delivery outlet is highly uniform
Diffusion light beam.But the expensive of integrating sphere, volume are big, radiation energy surplus for camera calibration is excessive therefore right
Usage scenario is limited.
Summary of the invention
The application provides cheap, the accurate camera calibration peace field correction apparatus of one kind, camera calibration method and flat field school
Correction method.
According in a first aspect, providing a kind of camera calibration peace field correction apparatus in a kind of embodiment, comprising:
Camera bellows；
Light source generator is mounted in camera bellows, light source generator include adjustable illuminating brightness LED light source and with
Connection optical fiber, LED light source pass through fibre optical transmission illumination light；
For detecting the benchmark camera of illumination light irradiance and irradiation uniformity；
Mobile station can be mounted in camera bellows along what parallel and vertical illumination light optical axis direction moved, and mobile station, which is equipped with, to be used
Position is carried in carry camera to be checked first and the second carrying position for carrying benchmark camera, the first carrying position and the second carrying
Position is arranged side by side along the direction of vertical illumination light optical axis, and benchmark camera is mounted on the second carrying position of mobile station, and towards light
Fine transmitting terminal setting.
Further, camera calibration peace field correction apparatus further includes optical fiber mounting rack, and optical fiber mounting rack is mounted on camera bellows
Interior, between light source generator and mobile station, the upper end of optical fiber mounting rack is equipped with an installation end rotatably adjusted, optical fiber
Transmitting terminal be mounted on the installation end of optical fiber mounting rack, installation end is used to adjust the direction of illumination light optical axis.
Further, camera calibration peace field correction apparatus further includes the first guide rail and the second guide rail, the installation of the first guide rail
It is arranged in camera bellows, and along the direction of parallel illumination light optical axis, the second guide rail is moveably mounted on the first guide rail, and with the
One guide rail is vertical, and mobile station is moveably mounted on the second guide rail.
Further, the installation end of optical fiber mounting rack is used to adjust the levelness of illumination light optical axis, and the first guide rail is along horizontal
Direction setting, the second guide rail are arranged along the vertical direction, the first carrying position of mobile station and the second carrying position setting side by side up and down.
Further, camera calibration peace field correction apparatus further includes driving mechanism, driving mechanism respectively with the second guide rail
It is connected with mobile station, for driving the movement of the second guide rail and mobile station horizontal direction and driving the shifting of mobile station vertical direction
It is dynamic.
Further, camera calibration peace field correction apparatus further includes controller, respectively with driving mechanism, LED light source
It is connected with benchmark camera signal, and for being connect with camera signal to be checked；Controller includes control unit and processing unit, control
Unit is used to control driving mechanism and drives camera and benchmark camera switching to be checked alternately to the transmitting terminal of quasi-fiber, and for controlling
LED light source emits illumination light and adjusts the brightness of illumination light, and processing unit is used to obtain the imaging of camera and benchmark camera to be checked
Information and progress camera calibration and flat field correction process.
Further, it is 0.22 that optical fiber, which projects the numerical aperture of illumination light, and the length of optical fiber is 5m, mobile station and optical fiber
Spacing between transmitting terminal is 1-2m.
According to second aspect, a kind of camera calibration method is provided in a kind of embodiment, which is characterized in that including walking as follows
It is rapid:
S101: adjusting benchmark camera and be aligned with the transmitting terminal of optical fiber, the illumination light vertical incidence that LED light source emits to benchmark
On camera；
S102: LED light source, the uniformity of real-time observed image from benchmark camera image are opened, and adjusts benchmark camera
Spacing between the transmitting terminal of optical fiber, until the uniformity of illumination is more than or equal to 98% on benchmark camera；
S103: brightness or the distance between the camera and the transmitting terminal of optical fiber of LED light source transmitting illumination light are adjusted, n is obtained
A different irradiance value switches camera and benchmark camera to be checked in the position of n different irradiance values and receives illumination, respectively
The image for acquiring camera and benchmark camera to be checked, the gray value for obtaining the two are respectively(l=1,2 ..., n) and(l=
1,2,...,n)；
S104: the irradiation level E of illumination light is calculated by following boundary layer(l)(l=1,2 ..., n),
S0=G0·E+O0
Wherein, G0And O0Respectively indicate the response rate and biasing of benchmark camera；
S105: to irradiation level E(l)(l=1,2 ..., n) with camera pixel (i, j) output gray level to be checked(l=1,
2 ..., n) carry out linear fit obtain the calibration result of camera to be checked.
According to the third aspect, a kind of method for correcting flat field is provided in a kind of embodiment, which is characterized in that including walking as follows
It is rapid:
S201: adjusting benchmark camera and be aligned with the transmitting terminal of optical fiber, the illumination light vertical incidence that LED light source emits to benchmark
On camera；
S202: LED light source, the uniformity of real-time observed image from benchmark camera image are opened, and adjusts benchmark camera
Spacing between the transmitting terminal of optical fiber, until the uniformity of illumination is more than or equal to 98% on benchmark camera；
S203: mobile handoff camera to be checked is aligned with the transmitting terminal of optical fiber, closes LED light source, continuous acquisition camera to be checked
Several frames of darkfield image calculate the average value of gray value；
S204: opening LED light source, adjust the brightness of illumination light, so that the average gray of camera to be checked output reaches pre-
If saturation state, continuous acquisition several frames of camera bright field image to be checked calculate the average value of gray value；
S205: handling camera bright field and darkfield image to be checked, obtains the flat field correction coefficient of each pixel of camera to be checked,
The flat field correction of phase-detecting machine target surface is treated in completion.
Further, continuous acquisition camera to be checked calculates the average value of gray value in each 50 frame of light field and darkfield image；
And when opening LED light source, the brightness of illumination light is adjusted, so that the average gray of camera to be checked output reaches saturation state
70%.
The camera calibration peace field correction apparatus, camera calibration method and method for correcting flat field of foundation above-described embodiment, by
In camera calibration peace field correction apparatus using intensity adjustable LED light source as transmitting light source, benchmark camera is as illumination
The detector of light irradiance, camera and benchmark camera to be checked are mounted in moveable mobile station, and the present apparatus is passed through
It adjusts the brightness of LED light source or adjusts the spoke for adjusting illumination light between camera and benchmark camera to be checked at a distance from LED light source
Illumination, to realize the irradiation of different irradiation level, and benchmark camera is planar array detector, and benchmark camera can also be used to detection and shine
The irradiation uniformity of Mingguang City so that the present apparatus is made of more cheap component, and is able to carry out quick accurate camera calibration
And flat field correction.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of camera calibration peace field correction apparatus in embodiment；
Fig. 2 is the flow chart of a kind of camera calibration method in embodiment；
Fig. 3 is a kind of flow chart of camera method for correcting flat field in embodiment.
Specific embodiment
Below by specific embodiment combination attached drawing, invention is further described in detail.
Embodiment one:
A kind of camera calibration peace field correction apparatus is present embodiments provided, the device is mainly used for the calibration of camera peace
Correction, it is equal or close to equal with correcting camera each pixel imaging gray value, meet the needs of using, such as demarcate and flat field
Fluorescence imaging camera on suppressor sequenator.
As shown in Figure 1, the camera calibration peace field correction apparatus of the present embodiment mainly include camera bellows 1, light source generator 2,
Benchmark camera 3 and mobile station 4.
Camera bellows 1 is a lighttight seal case, and camera bellows 1 is rectangle body, is horizontally arranged, the other component of the present apparatus
It is all mounted in camera bellows 1, the interference to avoid ambient light to detection.
Light source generator 2 is mounted on one end in camera bellows 1, and light source generator 2 includes LED light source 21 and optical fiber 22, LED light
Source 21 is the light source of adjustable illuminating brightness, and one end of optical fiber 22 is connect with LED light source 21, and the other end is transmitting terminal, LED light
Source 21 emits illumination light by optical fiber 22.
In the present embodiment, to adjust the direction that light source generator 2 emits illumination light, guarantee light source generator 2 and benchmark
Camera 3 or camera to be checked 5 are aligned, i.e., illumination light can also pacify in vertical incidence to benchmark camera 3 or camera to be checked 5 in camera bellows 1
Equipped with an optical fiber mounting rack 6, the upper end of optical fiber mounting rack 6 is equipped with an installation end rotatably adjusted, the transmitting of optical fiber 22
End is mounted on the installation end of optical fiber mounting rack 6, adjusts the transmitting terminal of optical fiber 22 by the installation end rotation of optical fiber mounting rack 6
The direction of the launch guarantees that the illumination light optical axis of transmitting is in horizontality to overcome installation error.
Benchmark camera 3 is planar array detector, can be used for detecting illumination light irradiance and irradiation uniformity, to guarantee benchmark phase
The stated accuracy of machine 3, benchmark camera 3 need regular calibration.
Mobile station 4 is mainly used for carrying benchmark camera 3 and camera to be checked 5, and mobile station 4 is vertical flat at one in the present embodiment
It moves in face along horizontal and vertical direction or the movement of mobile station 4 is known as moving horizontally and lifting moving, the mesh moved horizontally
Be the spacing adjusted between benchmark camera 3 and camera to be checked 5 and the transmitting terminal of optical fiber 22, the purpose of lifting moving is switching base
Quasi- camera 3 and camera to be checked 5 are alternately to the transmitting terminal of quasi-fiber 22.
In other embodiments, mobile station 4 may be alternatively provided as on a horizontal plane along orthogonal both direction
It is mobile, spacing and switching benchmark camera 3 and camera to be checked between same achievable adjusting mobile station 4 and the transmitting terminal of optical fiber 22
The transmitting terminal of 5 pairs of quasi-fibers 22.
Specifically, mobile station 4 is equipped with side by side up and down two layers in the present embodiment, upper layer is equipped with for carrying camera 5 to be checked
The first carrying position, lower layer is equipped with the second carrying position for carrying benchmark camera 3, and benchmark camera 3 is fixedly mounted on mobile station 4
Second carrying position on, and the receiving end of benchmark camera 3 towards light source generator 2 be arranged, carrying be fixed on the first carrying position
On camera to be checked 5 also facing light source generator 2 be arranged.
In the present embodiment, in the present embodiment, the numerical aperture NA of optical fiber 22 is 0.22, and the length of optical fiber 22 is 5m, and
Medium position winds several circles.Spacing between mobile station 4 and the transmitting terminal of optical fiber 22 is 1-2m, and mobile station 4 can be in the spacing
It is mobile between end to adjust.The angle of divergence (half-angle) of optical fiber 22 is about 12.5 °, is analyzed and is tested, in the central area far field (> 1m)
More uniform illumination will be will form in 100 range of φ.
In other embodiments, optical fiber 22 and LED light source 21 are the integral structure being coupled, the length of optical fiber 22
And numerical aperture can also be set as needed as other numerical value.
In the present embodiment, in order to which mobile station 4 to be moveably mounted in camera bellows 1, the first guide rail 7 is installed in camera bellows 1
It (is shown in figure) with the second guide rail, the first guide rail 7 is horizontally arranged in camera bellows 1, and flat with the transmitting terminal optical axis of optical fiber 22
Row.Second guide rail is slidably mounted on the first guide rail 7, and the second guide rail is arranged along the vertical direction, vertical with the first guide rail 7,
Mobile station 4 is slidably mounted on the second guide rail, and mobile station 4 can be moved along the second lifting rail.
In the present embodiment, the hair of mobile station 4 moved horizontally for adjusting benchmark camera 3 and camera to be checked 5 and optical fiber 22
The spacing between end is penetrated, realizes the adjusting of illumination light irradiance, the vertical lifting of mobile station 4 is mobile for switching benchmark camera 3
The transmitting terminal of optical fiber 22 is respectively aligned to camera 5 to be checked, when transmitting terminal of the benchmark camera 3 to quasi-fiber 22, the light of illumination light
In axis vertical incidence to benchmark camera 3, benchmark camera 3 is for detecting illumination light irradiance and irradiation uniformity；When camera 5 to be checked
When to the transmitting terminal of quasi-fiber 22, in the optical axis vertical incidence to camera 5 to be checked of illumination light, for demarcating and flat field correction is to be checked
Camera 5.
Camera calibration peace field correction apparatus in the present embodiment further includes driving mechanism, and driving mechanism is led with second respectively
Rail and mobile station 4 connect, for driving the second guide rail and mobile station 4 to move horizontally and drive 4 vertical lifting of mobile station mobile.It drives
Motivation structure includes two cylinders and multiple displacement sensors, realizes the driving to the second guide rail and mobile station 4 and detection displacement.
Camera calibration peace field correction apparatus in the present embodiment further includes controller, respectively with driving mechanism, LED light
Source 21 is connected with 3 signal of benchmark camera, and for connecting with 5 signal of camera to be checked, and controller includes that control unit and processing are single
Member, control unit are used to control driving mechanism and drive camera 5 and benchmark camera 3 the switching alternately transmitting to quasi-fiber 22 to be checked
End, and for controlling the transmitting illumination light of LED light source 21 and adjusting the brightness of illumination light, processing unit is for obtaining camera 5 to be checked
With the imaging gray value information and progress camera calibration of benchmark camera 3 and flat field correction process.
A kind of camera calibration peace field correction apparatus provided in the present embodiment, due to camera calibration peace field correction apparatus
Using intensity adjustable LED light source 21 as transmitting light source, detector of the benchmark camera 3 as illumination light irradiance is to be checked
Camera 5 and benchmark camera 3 are mounted in moveable mobile station 4, and the present apparatus is enabled to pass through the brightness of adjusting LED light source 21
Or the distance between LED light source 21 and camera 5 to be checked and benchmark camera 3 are adjusted to adjust the irradiation level of illumination light, to realize not
With the irradiation of irradiation level, and benchmark camera 3 is planar array detector, and benchmark camera 3 can also be used to the irradiation of detection illumination light
Uniformity, so that the present apparatus is made of more cheap component, weight is lighter, and be able to carry out quickly accurate camera calibration and
Flat field correction.
Embodiment two:
Present embodiments provide a kind of camera calibration method, this camera calibration method based on the above embodiment one camera mark
Fixed peace field correction apparatus is realized.
As shown in Fig. 2, the camera calibration method of the present embodiment includes the following steps:
S101: incident angle is adjusted；
It keeps horizontal by the optical axis that the installation end of 6 upper end of optical fiber mounting rack adjusts illumination light, is risen vertically by mobile station 4
The mobile benchmark camera 3 that adjusts of drop is aligned to the transmitting terminal of optical fiber 22, so that the illumination light vertical incidence that LED light source 21 emits is extremely
On benchmark camera 3；
S102: the uniform position of illumination light is found；
LED light source, the uniformity of real-time observed image from 3 image of benchmark camera are opened, and passes through the movement of mobile station 4
The spacing between benchmark camera 3 and the transmitting terminal of optical fiber 22 is adjusted, until the uniformity of illumination is more than or equal on benchmark camera 3
98%；
S103: switching camera receives illumination in different location
It adjusts LED light source 21 and emits the brightness of illumination light or the hair of camera (camera 5 or benchmark camera 3 to be checked) and optical fiber 22
The spacing between end is penetrated, n different irradiance values are obtained, switches 5 He of camera to be checked in the position of n different irradiance values
Benchmark camera 3 receives illumination respectively, acquires the image of camera 5 or benchmark camera 3 to be checked respectively, obtains the gray scale of camera 5 to be checked
Value isThe gray value of benchmark camera 3 is
S104: the irradiation level of illumination light is calculated；
The irradiation level E of illumination light is calculated by the boundary layer of following benchmark camera 3(l)(l=1,2 ..., n),
S0=G0·E+O0
Wherein, G0And O0Respectively indicate the response rate and biasing of benchmark camera 3；
S105: the calibration result of camera to be checked is calculated；
According to the anti-irradiation level E released of benchmark camera 3(l)(l=1,2 ..., n), according to the response of following camera 5 to be checked
Equation is fitted to obtain irradiation level E(l)(l=1,2 ..., n) and output gray level valueThe calibration of linear fit
As a result:
Si,j=Gi,j·E+Oi,j
Wherein, Si,jFor the output gray level value of 5 pixel (i, j) of camera to be checked, E is the anti-irradiation level released of benchmark camera 3,
Gi,jAnd Oi,jRespectively indicate the response rate and biasing of camera 5 to be checked.
Camera calibration method provided in this embodiment goes out the irradiation of illumination light by the auxiliary Extrapolation of camera 5 to be checked
Degree, then the calibration result of the Fitting Calculation camera 5 to be checked, camera calibration method is simple to operation, and detection accuracy with higher.
Embodiment three:
A kind of camera method for correcting flat field provided in this embodiment, this camera method for correcting flat field based on the above embodiment one
In camera calibration peace field correction apparatus realize, and the camera calibration method in above-described embodiment two as premise progress camera
Flat field correction.
As shown in figure 3, the camera method for correcting flat field of the present embodiment, includes the following steps:
S201: incident angle is adjusted；
It keeps horizontal by the optical axis that the installation end of 6 upper end of optical fiber mounting rack adjusts illumination light, is risen vertically by mobile station 4
The mobile benchmark camera 3 that adjusts of drop is aligned to the transmitting terminal of optical fiber 22, so that the illumination light vertical incidence that LED light source 21 emits is extremely
On benchmark camera 3；
S202: the uniform position of illumination light is found；
LED light source 21, the uniformity of real-time observed image from 3 image of benchmark camera are opened, and passes through the shifting of mobile station 4
The dynamic spacing adjusted between benchmark camera 3 and the transmitting terminal of optical fiber 22, until the uniformity of illumination is more than or equal on benchmark camera 3
98%；
S203: dark field acquisition correction parameter；
Mobile mobile station 4 switches camera 5 to be checked and is aligned with the transmitting terminal of optical fiber 22, turns off LED light source 21, continuous acquisition
Several frames of 5 darkfield image of camera to be checked are simultaneously averaged；50 frame darkfield image of continuous acquisition calculates in dark field in the present embodiment
The average value S of gray value out1, 50 frame darkfield images of acquisition, which are averaged, can effectively lower Acquisition Error.
S204: light field acquisition correction parameter；
LED light source 21 is opened, the brightness of illumination light is adjusted, so that the average gray that camera to be checked 5 exports reaches saturation
The 70% of state, several frames of continuous acquisition 5 bright field image of camera to be checked calculate the average value of gray value；Bright in the present embodiment
50 frame darkfield image of continuous acquisition calculates the average value S of gray value in2, equally, 50 frame bright field images of acquisition are averaged
Acquisition Error can effectively be lowered.
S205: correction parameter；
The average value that camera 5 to be checked is calculated through the above steps in dark field and the gray value of light field is respectively S1And S2, root
According to the calibration result (S of the calculated camera 5 to be checked of embodiment twoi,j=Gi,j·E+Oi,j), the irradiation level of illumination light in dark field
E is zero, can treat the biasing O of phase-detecting machine 5i,jIt is corrected；In light field, due to biasing Oi,jIt is corrected, phase-detecting machine 5 can be treated
Response rate Gi,jIt is corrected.The correction for treating 5 two parameters of phase-detecting machine is realized by light field and dark field two point correction method,
To realize the correction for treating the entire field of phase-detecting machine 5.
A kind of camera method for correcting flat field provided in this embodiment passes through light field and dark field two o'clock after calculating calibration result
The method of correction realizes that two parameters for treating phase-detecting machine 5 are corrected, final to realize the school for treating the entire field of phase-detecting machine 5
Just, this method for correcting flat field is simple and effective, and correction accuracy is high, the imagewise uniform degree of each pixel of camera can be corrected into it is consistent or
It is almost consistent.
Use above specific case is illustrated the present invention, is merely used to help understand the present invention, not to limit
The system present invention.For those skilled in the art, according to the thought of the present invention, can also make several simple
It deduces, deform or replaces.
Claims (10)
1. a kind of camera calibration peace field correction apparatus characterized by comprising
Camera bellows；
Light source generator is mounted in the camera bellows, and the light source generator includes the LED light source of adjustable illuminating brightness
With the optical fiber being attached thereto, the LED light source passes through the fibre optical transmission illumination light；
For detecting the benchmark camera of illumination light irradiance and irradiation uniformity；
Mobile station can be mounted in the camera bellows along what parallel and vertical illumination light optical axis direction moved, and the mobile station is set
There are the first carrying position for carrying camera to be checked and the second carrying position for carrying the benchmark camera, first carrying
Position and the second carrying position are arranged side by side along the direction of vertical illumination light optical axis, and the benchmark camera is mounted on the of the mobile station
On two carrying positions, and it is arranged towards the transmitting terminal of the optical fiber.
2. camera calibration peace field correction apparatus as described in claim 1, which is characterized in that further include optical fiber mounting rack, institute
Optical fiber mounting rack is stated to be mounted in the camera bellows, between the light source generator and mobile station, the optical fiber mounting rack
Upper end is equipped with an installation end rotatably adjusted, and the transmitting terminal of the optical fiber is mounted on the installation end of the optical fiber mounting rack
On, the installation end is used to adjust the direction of illumination light optical axis.
3. camera calibration peace field correction apparatus as claimed in claim 2, which is characterized in that further include the first guide rail and second
Guide rail, first guide rail are mounted in the camera bellows, and are arranged along the direction of parallel illumination light optical axis, and second guide rail can
Mobile is mounted on first guide rail, and vertical with first guide rail, and the mobile station is moveably mounted to described
On second guide rail.
4. camera calibration peace field correction apparatus as claimed in claim 3, which is characterized in that the installation of the optical fiber mounting rack
The levelness for adjusting illumination light optical axis is held, first guide rail is horizontally disposed, and second guide rail is along vertical side
To setting, the first carrying position of the mobile station and the second carrying position setting side by side up and down.
5. camera calibration peace field correction apparatus as claimed in claim 4, which is characterized in that it further include driving mechanism, it is described
Driving mechanism is connect with the second guide rail and mobile station respectively, for driving the movement and drive of the second guide rail and mobile station horizontal direction
The movement of dynamic mobile station vertical direction.
6. camera calibration peace field correction apparatus as claimed in claim 5, which is characterized in that it further include controller, difference
It is connect with driving mechanism, LED light source and benchmark camera signal, and for being connect with camera signal to be checked；The controller includes
Control unit and processing unit, described control unit drive camera and benchmark camera switching alternating to be checked for controlling driving mechanism
It is directed at the transmitting terminal of the optical fiber, and for controlling LED light source transmitting illumination light and adjusting the brightness of illumination light, the processing is single
Member is for obtaining the image-forming information of the camera to be checked and benchmark camera and carrying out camera calibration and flat field correction process.
7. camera calibration peace field correction apparatus as claimed in claim 6, which is characterized in that the optical fiber projects illumination light
Numerical aperture is 0.22, and the length of the optical fiber is 5m, and the spacing between the mobile station and the transmitting terminal of the optical fiber is 1-
2m。
8. a kind of camera calibration method based on the described in any item camera calibration peace field correction apparatus of claim 1 to 7,
It is characterized in that, includes the following steps:
S101: adjusting benchmark camera and be aligned with the transmitting terminal of optical fiber, the illumination light vertical incidence that LED light source emits to benchmark camera
On；
S102: LED light source, the uniformity of real-time observed image from benchmark camera image are opened, and adjusts benchmark camera and light
Spacing between fine transmitting terminal, until the uniformity of illumination is more than or equal to 98% on benchmark camera；
S103: brightness or the distance between the camera and the transmitting terminal of optical fiber of LED light source transmitting illumination light are adjusted, obtains n not
Same irradiance value switches camera and benchmark camera to be checked in the position of n different irradiance values and receives illumination, acquires respectively
The image of camera and benchmark camera to be checked, the gray value for obtaining the two are respectivelyWith
S104: the irradiation level E of illumination light is calculated by following boundary layer(l)(l=1,2 ..., n),
S0=G0·E+O0
Wherein, G0And O0Respectively indicate the response rate and biasing of benchmark camera；
S105: to irradiation level E(l)(l=1,2 ..., n) with camera pixel (i, j) output gray level to be checkedInto
Row linear fit obtains the calibration result of camera to be checked.
9. a kind of method for correcting flat field based on the described in any item camera calibration peace field correction apparatus of claim 1 to 7,
It is characterized in that, includes the following steps:
S201: adjusting benchmark camera and be aligned with the transmitting terminal of optical fiber, the illumination light vertical incidence that LED light source emits to benchmark camera
On；
S202: LED light source, the uniformity of real-time observed image from benchmark camera image are opened, and adjusts benchmark camera and light
Spacing between fine transmitting terminal, until the uniformity of illumination is more than or equal to 98% on benchmark camera；
S203: mobile handoff camera to be checked is aligned with the transmitting terminal of optical fiber, closes LED light source, continuous acquisition camera dark field to be checked
Several frames of image calculate the average value of gray value；
S204: opening LED light source, adjust the brightness of illumination light, so that the average gray of camera to be checked output reaches default full
And state, continuous acquisition several frames of camera bright field image to be checked calculate the average value of gray value；
S205: handling camera bright field and darkfield image to be checked, obtains the flat field correction coefficient of each pixel of camera to be checked, completes
Treat the flat field correction of phase-detecting machine target surface.
10. method for correcting flat field as claimed in claim 9, which is characterized in that continuous acquisition camera to be checked is in light field and dark field
Each 50 frame of image calculates the average value of gray value；And when opening LED light source, the brightness of illumination light is adjusted, so as to phase-detecting
The average gray of machine output reaches the 70% of saturation state.
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| CN111462001A (en) * | 2020-03-18 | 2020-07-28 | 宁波江丰生物信息技术有限公司 | Flat field correction method for fluorescence slice scanner |
| CN113340895A (en) * | 2021-06-04 | 2021-09-03 | 深圳中科飞测科技股份有限公司 | Adjusting method of detection system and detection system |
| CN113607050A (en) * | 2021-07-14 | 2021-11-05 | 中国大恒(集团)有限公司北京图像视觉技术分公司 | Camera test tool |
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| CN113607050A (en) * | 2021-07-14 | 2021-11-05 | 中国大恒(集团)有限公司北京图像视觉技术分公司 | Camera test tool |
| CN113873222A (en) * | 2021-08-30 | 2021-12-31 | 卡莱特云科技股份有限公司 | Industrial camera linearity correction method and device |
| CN113873222B (en) * | 2021-08-30 | 2023-08-01 | 卡莱特云科技股份有限公司 | Linearity correction method and device for industrial camera |
| CN114001941A (en) * | 2021-10-28 | 2022-02-01 | 华中科技大学 | Ship propulsion shafting exciting force centering loading and detecting device |
| CN115022610A (en) * | 2022-05-26 | 2022-09-06 | 秦皇岛威卡威佛吉亚汽车内饰件有限公司 | Flat field correction method for linear array camera |
| CN115482171A (en) * | 2022-09-27 | 2022-12-16 | 瑞石心禾(河北)医疗科技有限公司 | A for gamma camera uniformity correction method and device |
| CN115760653A (en) * | 2023-01-09 | 2023-03-07 | 武汉中导光电设备有限公司 | Image correction method, device, equipment and readable storage medium |
| CN116087104A (en) * | 2023-04-07 | 2023-05-09 | 苏州苏映视图像软件科技有限公司 | Scanning system and method for line scanning micro-distance camera |
| CN117152014A (en) * | 2023-09-05 | 2023-12-01 | 珠海圣美生物诊断技术有限公司 | Flat field correction method and device for multichannel fluorescence microscope |
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