CN109799079A - A kind of the common optical axis calibrator and method of multispectral camera - Google Patents
A kind of the common optical axis calibrator and method of multispectral camera Download PDFInfo
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Abstract
The invention discloses the common optical axis calibrator and method of a kind of multispectral camera, calibrator includes laser generator, optical lens, the first test scale target, the second test scale target, spectroscope and reflecting mirror.Wherein, laser generator mainly provides thin collimated laser beam；First test scale target and the second test scale target are as the foundation tuned up；Optical lens is used to directional light converging to focal position.When tune-up, taking-up reflecting mirror, the adjustment each regulator site of spectroscope make the laser beam of laser transmitter projects out in the center of the first test scale target first；After adjusting spectroscope, it is inserted into reflecting mirror, the laser beam that the adjustment each regulator site of reflecting mirror goes out laser transmitter projects is in the center of the second scale test target.Specific calibrating installation calibrates the optical axis of front end optical path, preferably facilitates later image fusion registration.
Description
Technical field
The present invention relates to status of electric power detection fields, tune up dress more particularly to a kind of common optical axis of multispectral camera
It sets and method.
Background technique
Multispectral camera is the different spectral coverage image that same ground object target is obtained using different spectrums, passes through different spectrums
The fusion of section image, can obtain the geometry and spectral properties of earth's surface scenery simultaneously, be with a wide range of applications.Multispectral phase
Machine be widely used at present aerospace investigation, state resource investigation and monitor, prevent and reduce natural disasters, agriculture, forestry, water conservancy, ecological environment,
The fields such as city construction planning and building.
In the prior art, high-tension electricity equipment in operation, due to acting on while voltage and current, can generate fuel factor
And corona effect.Power grid operation maintenance personnel is to grasp the operating status of equipment, generallys use infrared thermoviewer and ultraviolet imager pair
Electrical equipment thermometric and ultraviolet imagery.
It, can be because optical axis deviation problem occurs two using parallel optical axis multispectral camera when rear end carries out image co-registration
Channel or the unmatched problem of multiple channel images can significantly influence back-end image fusion if optical axis deviation is excessive
Effect, and the center of BEAM SQUINT rear end camera lens can bring later image to be registrated insurmountable distortion and the curvature of field.Even if light
Axis deviation is smaller, can also increase the difficulty of back-end image processing, influence the visual field size of final image.It needs as can be seen from the above
It wants specific calibrating installation to calibrate the optical axis of front end optical path, preferably facilitates later image fusion registration.
Summary of the invention
The present invention provides the common optical axis calibrators and method of a kind of multispectral camera, to solve multispectral camera use
When common optical axis designs, optical axis can not effectively realize the case where being precisely arranged in parallel, and proposition is carried out precisely by the way of scale target
The method of calibration, with realize multispectral camera parallel optical axis optical path it is accurate parallel.
In order to achieve the above objectives, the invention provides the following technical scheme:
A kind of common optical axis calibrator of multispectral camera, including laser generator, optical lens, the first test scale
Target, the second test scale target and spectroscope；
The laser generator, the optical lens and the second test scale target are point-blank；
The optical lens is set between the laser generator and the second test scale target；
The spectroscope is equipped between the laser generator and the optical lens；
The laser that the laser generator issues is irradiated at a certain angle on the spectroscope, and the spectroscope will be described
On laser reflection to the first test scale target.
Optionally, the common optical axis calibrator further includes reflecting mirror；The reflecting mirror is located at the spectroscope and described
Between first test scale target, the reflecting mirror will come from optical lens described in the vertical directive of spectroscopical reflected light.
Optionally, the optical lens is concave-convex lens, for what will be reflected from the spectroscope and the reflecting mirror
Directional light converges to same focal position.
Optionally, horizontal direction and vertical is respectively equipped on the first test scale target and the second test scale target
The scale in direction.
Optionally, it is between 0 degree to 90 degree that the spectroscope and the laser generator, which issue the angle of laser,.
A kind of common optical axis correcting and regulating method of multispectral camera, which comprises
Spectroscope is tuned up；
Reflecting mirror is tuned up.
Optionally, it is described to spectroscope carry out tune up include:
Laser generator is opened, laser is made to reach the first test scale target through spectroscope reflection；
The first information that laser is located on the first test scale target is obtained, spectroscope is calculated according to the first information
First adjust angle.
Optionally, the first information includes vertical difference of the laser dot apart from the first test scale pinwheel point
Distance d1, level difference distance d2；The first adjusting angle includes pitch angle β1With level angle β2；
Wherein, described to include: according to the spectroscopical first adjusting angle of first information calculating
According to vertical difference distance d1, level difference distance d2Calculate the pitch deviation angle that the beam splitter optical axis generates
α1And horizontal departure angle α2:
Wherein, D is the spectroscope at a distance from the first test scale target；
According to the pitch deviation angle [alpha]1With the horizontal departure angle α2Obtain the pitch angle β1With the level
Angle beta2, then
Optionally, it is described to reflecting mirror carry out tune up include:
Laser generator is opened, a part of laser is reflected through spectroscope and reaches reflecting mirror, another part warp of laser
Spectroscope is transmitted through optical lens；
Reflecting mirror is adjusted, the laser for reaching reflecting mirror is made to reflect vertical directive optical lens through reflecting mirror；
Optical lens converges to the directional light from spectroscope transmission and reflecting mirror reflection on the second test scale target；
The second information that laser is located on the second test scale target is obtained, reflective mirror is calculated according to second information
Second adjust angle.
Optionally, second information includes difference distance of the laser dot apart from the second test scale pinwheel point
d3, level difference distance d4；The second adjusting angle includes pitch angle β3With level angle β4；
Wherein, described to include: according to the spectroscopical second adjusting angle of second information calculating
According to vertical difference distance d3, level difference distance d4Calculate the pitch deviation angle that the beam splitter optical axis generates
α3, horizontal departure angle α4:
Wherein, F is the focal length of the optical lens；
According to the pitch deviation angle [alpha]3And the horizontal departure angle α4Obtain the pitch angle β3With the level
Angle beta4, then
As seen through the above technical solutions, specific calibrating installation calibrates the optical axis of front end optical path, preferably side
Phase image co-registration is registrated after an action of the bowels.
Detailed description of the invention
In order to illustrate more clearly of technical solution of the present invention, letter will be made to attached drawing needed in the embodiment below
Singly introduce, it should be apparent that, for those of ordinary skills, without any creative labor,
It is also possible to obtain other drawings based on these drawings.
Fig. 1 is the structural schematic diagram of the embodiment of the present invention；
Fig. 2 is pitch deviation angle [alpha] of the invention1And horizontal departure angle α2Structural schematic diagram；
Fig. 3 is the structural schematic diagram of the size of the device of the invention；
Fig. 4 is the structural schematic diagram of the imaging point of the device of the invention；
Fig. 5 is the structural schematic diagram of optical path of the invention；
Fig. 6 is the flow chart that multispectral common optical axis of the invention tunes up；
Fig. 7 is the flow chart that spectroscope of the invention tunes up；
Fig. 8 is the flow chart that calculating spectroscopical first of the invention adjusts angle；
Fig. 9 is the flow chart of the invention tuned up to reflecting mirror；
Figure 10 is the flow chart that calculating spectroscopical second of the invention adjusts angle.
Specific embodiment
The preferred embodiments of the present invention will be described in detail with reference to the accompanying drawing, so that advantages and features of the invention energy
It is easier to be readily appreciated by one skilled in the art, so as to make a clearer definition of the protection scope of the present invention.
Multispectral camera can be divided into three categories: first is more lens type multispectral cameras.It has 4-9 camera lens,
Each camera lens respectively has an optical filter, and a kind of light of relatively narrow spectrum is allowed to pass through respectively, and a plurality of lenses shoot same scenery simultaneously, uses
One film records the image information of several different bands simultaneously.Second is multiphase type multispectral camera.It is by several
Together, each camera is respectively provided with different optical filters to platform camera combination, on the different bands for receiving scenery respectively
Information, while shooting same scenery, respectively obtain the film of a set of special spectrum band.Third is the photograph of light beam isolated multispectrum
Machine.It uses a camera lens photographed, and the light from scenery is separated into several wave bands with multiple prism scene devices
Light beam is respectively got off the optical information recording of each wave band with more set films.In these three multispectral cameras, light beam divergence type shines
The advantages of camera is that structure is simple, and image overlapping accuracy is high, but image quality is poor；More camera lenses and multiphase type camera are also difficult quasi-
It really is directed at same direction, overlapping accuracy is high, and image quality is poor, meanwhile, the processing time of overlapping is longer.
As shown in Figure 1, a kind of common optical axis calibrator of multispectral camera, including laser generator 1, optical lens 2,
One test scale target 3, second tests scale target 4, spectroscope 5.Wherein, laser generator mainly provides thin collimation laser；First
Scale target 3 and the second test scale target 4 are tested as the foundation tuned up；Optical lens 2 is used to directional light converging to focus position
It sets.
The laser generator 1, the optical lens 2 and the second test scale target 4 are point-blank；
The optical lens 2 is set between the laser generator 1 and the second test scale target 4；
The spectroscope 5 is equipped between the laser generator 1 and the optical lens 2；
The laser that the laser generator 1 issues is irradiated at a certain angle on the spectroscope 5, is re-reflected into described the
On one test scale target 3.
Optionally, the common optical axis calibrator further includes reflecting mirror 6, the reflecting mirror 6 be located at the spectroscope 5 and
Between the first test scale target 3, the reflecting mirror 6 is by optics described in the vertical directive of reflected light from the spectroscope 5
Lens 2；
Optionally, the optical lens 2 is concave-convex lens, flat by reflecting from the spectroscope 5 and the reflecting mirror 6
Row light converges to same focal position.
Optionally, the first test scale target 3 and the second test scale target 4 are equipped with horizontally and vertically above
Scale.
Optionally, it is between 0 degree to 90 degree that the spectroscope 5 and the laser generator, which issue the angle of laser,.
Common optical axis calibrator based on above-mentioned multispectral camera, the present invention in actual use, such as Fig. 2, Fig. 3, Fig. 4 and
Shown in Fig. 6, tuned up by the common optical axis that following steps complete multispectral camera.
S1: spectroscope is tuned up；
S2: reflecting mirror is tuned up.
As shown in fig. 7, the step S1: carrying out tune-up to spectroscope includes:
S11: opening laser generator, reaches laser on the first test scale target by spectroscope reflection；
S12: the first information that laser is located on the first test scale target is obtained, is calculated and is divided according to the first information
The first of light microscopic adjusts angle.
Wherein, the first information includes vertical phase gap of the laser dot apart from the first test scale pinwheel point
From d1, level difference distance d2；The first adjusting angle includes pitch angle β1With level angle β2；
As shown in Figure 8, wherein described that spectroscopical first adjusting angle is calculated according to the first information in step S12
Include:
S121: according to vertical difference distance d1, level difference distance d2Calculate the pitch deviation that the beam splitter optical axis generates
Angle [alpha]1And horizontal departure angle α2:
Wherein, D is the spectroscope at a distance from the first test scale target；
As shown in figure 5, passing through reflection law, it is known that incidence angle and angle of reflection are equal, if the incident angle of ideal mirror is
X, then
X+ β=X- β+α
So
S122: according to the pitch deviation angle [alpha]1With the horizontal departure angle α2Obtain the pitch angle β1And institute
State level angle β2, then
After having adjusted spectroscope 5, it is put into reflecting mirror 6, continues to tune up reflecting mirror 6；Specifically, as shown in figure 9,
Step S2 can resolve into the following steps:
S21: opening laser generator 1, and a part of laser is made to reach reflecting mirror by spectroscope reflection, laser it is another
Part is transmitted through optical lens through spectroscope.
S22: adjusting reflecting mirror, and the laser for reaching reflecting mirror is made to reflect vertical directive optical lens through reflecting mirror.
S23: the directional light reflected from spectroscope transmission and reflecting mirror is converged to the second test scale target by optical lens
On.
S24: the second information that laser is located on the second test scale target is obtained, is calculated according to second information anti-
The second of light microscopic adjusts angle.
Wherein, second information includes vertical phase gap of the laser dot apart from the second test scale pinwheel point
From d3, level difference distance d4；The second adjusting angle includes pitch angle β3With level angle β4；
As shown in Figure 10, wherein described that spectroscopical second adjusting angle is calculated according to second information in step S24
Degree includes:
S241: according to vertical difference distance d3, level difference distance d4Calculate the pitch deviation that the beam splitter optical axis generates
Angle [alpha]3, horizontal departure angle α4:
Wherein, F is the focal length of the optical lens；
S242: according to the pitch deviation angle [alpha]3And the horizontal departure angle α4Obtain the pitch angle β3And institute
State level angle β4, then
This application provides the common optical axis calibrator and method of a kind of multispectral camera, calibrator includes laser
Device, optical lens, the first test scale target, the second test scale target, spectroscope and reflecting mirror.Wherein, laser generator is main
Thin collimated laser beam is provided；First test scale target and the second test scale target are as the foundation tuned up；Optical lens is used for will
Directional light converges to focal position.When tune-up, taking-up reflecting mirror, the adjustment each regulator site of spectroscope make laser emitter first
The laser beam launched is in the center of the first test scale target；After having adjusted spectroscope, it is inserted into reflecting mirror, adjusts reflecting mirror
The laser beam that each regulator site goes out laser transmitter projects is in the center of the second scale test target.Specific calibrating installation
The optical axis of front end optical path is calibrated, later image fusion registration is preferably facilitated.
Those skilled in the art after considering the specification and implementing the invention disclosed here, will readily occur to of the invention its
Its embodiment.This application is intended to cover any variations, uses, or adaptations of the invention, these modifications, purposes or
Person's adaptive change follows general principle of the invention and including the undocumented common knowledge in the art of the present invention
Or conventional techniques.The description and examples are only to be considered as illustrative, and true scope and spirit of the invention are by appended
Claim is pointed out.
It should be understood that the present invention is not limited to the precise structure already described above and shown in the accompanying drawings, and
And various modifications and changes may be made without departing from the scope thereof.The scope of the present invention is limited only by the attached claims.
Claims (10)
1. a kind of common optical axis calibrator of multispectral camera, it is characterised in that: including laser generator (1), optical lens
(2), the first test scale target (3), the second test scale target (4) and spectroscope (5)；
The laser generator (1), the optical lens (2) and second test scale target (4) are point-blank；
The optical lens (2) is set between the laser generator (1) and second test scale target (4)；
The spectroscope (5) are equipped between the laser generator (1) and the optical lens (2)；
The laser that the laser generator (1) issues is irradiated at a certain angle on the spectroscope (5), the spectroscope (5)
It will be on the laser reflection to first test scale target (3).
2. a kind of common optical axis calibrator of multispectral camera according to claim 1, it is characterised in that: the common optical axis
Calibrator further includes reflecting mirror (6)；The reflecting mirror (6) is located at the spectroscope (5) and first test scale target (3)
Between；The reflecting mirror (6) will come from optical lens (2) described in the vertical directive of reflected light of the spectroscope (5).
3. a kind of common optical axis calibrator of multispectral camera according to claim 2, it is characterised in that: the optical lens
Mirror (2) is concave-convex lens, same for converging to the directional light reflected from the spectroscope (5) and the reflecting mirror (6)
Focal position.
4. a kind of common optical axis calibrator of multispectral camera according to claim 2, it is characterised in that: described first surveys
Scale horizontally and vertically is respectively equipped in examination scale target (3) and second test scale target (4).
5. a kind of common optical axis calibrator of multispectral camera according to claim 1, it is characterised in that: the spectroscope
(5) and the angle of the laser generator (1) sending laser is between 0 degree to 90 degree.
6. a kind of common optical axis correcting and regulating method of multispectral camera, which is characterized in that the described method includes:
Spectroscope is tuned up；
Reflecting mirror is tuned up.
7. a kind of common optical axis correcting and regulating method of multispectral camera according to claim 6, it is characterised in that: described pair of light splitting
Mirror tune up
Laser generator is opened, laser is made to reach the first test scale target through spectroscope reflection；
The first information that laser is located on the first test scale target is obtained, the spectroscope is calculated according to the first information
First adjust angle.
8. a kind of common optical axis correcting and regulating method of multispectral camera according to claim 7, it is characterised in that: first letter
Breath includes vertical difference distance d of the laser dot apart from the first test scale pinwheel point1, level difference distance d2；It is described
First adjusting angle includes pitch angle β1With level angle β2；
Wherein, described to include: according to first information calculating spectroscopical first adjusting angle
According to the vertical difference distance d1, the horizontal difference distance d2Calculate the pitch deviation that the beam splitter optical axis generates
Angle [alpha]1And horizontal departure angle α2:
Wherein, D is the spectroscope at a distance from the first test scale target；
According to the pitch deviation angle [alpha]1With the horizontal departure angle α2Obtain the pitch angle β1With the level angle
β2, then
9. a kind of common optical axis correcting and regulating method of multispectral camera according to claim 6, which is characterized in that described pair of reflection
Mirror tune up
Laser generator is opened, a part of laser is made to reach the reflecting mirror, another part warp of laser through spectroscope reflection
The spectroscope is transmitted through optical lens；
The reflecting mirror is adjusted, the laser for reaching the reflecting mirror is made to reflect optical lens described in vertical directive through the reflecting mirror
Mirror；
Directional light from spectroscope transmission and reflecting mirror reflection is converged to the second test and carved by the optical lens
It spends on target；
The second information that laser is located on the second test scale target is obtained, the reflective mirror is calculated according to second information
Second adjust angle.
10. a kind of common optical axis correcting and regulating method of multispectral camera according to claim 9, it is characterised in that: described second
Information includes vertical difference distance d of the laser dot apart from the second test scale pinwheel point3, level difference distance d4；Institute
Stating the second adjusting angle includes pitch angle β3With level angle β4；
Wherein, described to include: according to second information calculating spectroscopical second adjusting angle
According to the vertical difference distance d3, the horizontal difference distance d4Calculate the pitch deviation that the beam splitter optical axis generates
Angle [alpha]3, horizontal departure angle α4:
Wherein, F is the focal length of the optical lens；
According to the pitch deviation angle [alpha]3And the horizontal departure angle α4Obtain the pitch angle β3With the level angle
β4, then
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113985618A (en) * | 2021-12-28 | 2022-01-28 | 广东麦特维逊医学研究发展有限公司 | Optical axis automatic alignment device and working method thereof |
| CN117218211A (en) * | 2023-11-09 | 2023-12-12 | 广东兆恒智能科技有限公司 | Camera calibration device and calibration method |
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| CN109799079B (en) | 2024-04-09 |
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