CN103499433B - Distortion calibration method for f-theta optical system - Google Patents
Distortion calibration method for f-theta optical system Download PDFInfo
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- CN103499433B CN103499433B CN201310468730.XA CN201310468730A CN103499433B CN 103499433 B CN103499433 B CN 103499433B CN 201310468730 A CN201310468730 A CN 201310468730A CN 103499433 B CN103499433 B CN 103499433B
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Abstract
The invention provides a distortion testing device for an f-theta optical system. The testing device comprises a turntable, a guide rail, a target generator and an image analyzer in sequential arrangement, wherein the guide rail is arranged on the turntable, the target generator is arranged at the object space of a calibrated optical system, and the image analyzer is arranged at the image space of the calibrated optical system. The distortion calibration device and a distortion calibration method for the f-theta optical system have the advantage that the providing of targets in different object distances can be simultaneously realized.
Description
Technical field
The invention belongs to optical testing art, it is related to a kind of device and method for demarcating the distortion of f- θ optical system, especially
It is related to a kind of demarcation of optical camera for f- theta structure form optical system distortion before docking with detector.
Background technology
F- θ optical system circular fisheye head, its visual field up to 180 degree more than, its special applications in terms of photography is
It is it is known that however, fish-eye purposes is far above this.In astronomy, meteorology, film, measurement, pipe detection, fire prevention prison
Depending on, the medical aspect such as endoscope detecting or even public security, frontier defense, they also have ample scope for one's abilities.In current information age, flake mirror
Head is succeeded application in fields such as navigation, positioning, remote sensing, optic communication, machine vision, small intelligence systems again；And in national defence
In military affairs, they even more occupy important and irreplaceable status, but fish-eye design is more much more difficult than conventional system,
Fisheye camera once can shoot the scenery of about 180 degree field range, and compared with the camera of common optical system, fisheye photo comprises
More information.Therefore, fisheye camera has extensive answering in vision guided navigation and closely large field object identification and positioning
With.But, because fish-eye particularity leads to fisheye camera to have very serious anamorphose, fish-eye imaging
Plane is not plane, but is similar to spherical curved surface, and therefore, panorama picture of fisheye lens is not preferable perspective projection.In high precision
Demarcate fish eye lens parameter become one of key technology in flake visual system, have in its parameter one most important be exactly optics
The distortion of system.Although distortion has no effect on image definition, optical system has distortion but to directly affect the geometry of imaging
Positional precision, the bigger distortion in visual field is bigger.In order to obtain accurate geometric position image although optical system design when for
The distortion of different visual fields is corrected as far as possible, but will necessarily produce error due to processing and assembling, and leads to final molding
There is relatively large deviation in optical system and design result, this requires to need the amount of distortion to optical system to carry out accurate measurement, if
Method finds out the actual distortion error distribution of optical system, is revised with the method for mathematics if necessary, with reach carry high-precision
Purpose.Still there is no device or the method demarcated dedicated for the distortion of f- θ optical system at present, accidental report is using special making
Target carry out qualitative checking, the method drawback is more：Different types of f- θ optical system need to design different targets it is impossible to
Realize versatility；Even if, under the conditions of different object distances, target size is also different for same f- θ optical system；Target makes ratio
More complicated；Certainty of measurement is low, and being made and demarcate by target is affected, and final distortion stated accuracy is in one of percentage left and right；Target
Mark is planar graph it is impossible to provide real curved surface effect.
Content of the invention
In order to solve the technical problem in the presence of background technology, the present invention proposes a kind of abnormal for f- θ optical system
The caliberating device becoming and method, can realize the offer of different object distances target simultaneously.
The technical solution of the present invention is：A kind of distortion testing device of f- θ optical system it is characterised in that：Described
Guide rail on turntable that test device includes setting gradually, turntable, the target generator of optical system object space being calibrated, marked
Determine the picture analyzer of the image space of optical system.
Light source that above-mentioned target generator includes being successively set on guide rail, collimating mirror, optical filter, condenser lenss, star orifice plate
And target micro mirror, described light source, collimating mirror, optical filter, condenser lenss, star orifice plate and target micro mirror are arranged on same light
On axle.
Above-mentioned picture analyzer includes image-forming objective lens, detector and three-dimensional mobile support；Described image-forming objective lens are according to certain
Imaging relations be connected with detector, described image-forming objective lens and detector are arranged on the mobile support of three-dimensional dimension.
Above-mentioned test device also includes computing unit, and described computing unit includes computer, and described computer includes controlling
Turntable, guide rail, the automatic control unit of three-dimensional mobile support motion and the calculation processing unit calculating distortion.
, on platform, the described front end as analyzer is provided for fixing f- θ light for above-mentioned picture analyzer and computer installation
The special tooling of system.
Above-mentioned turntable and guide rail are manual form or Electronic control.
Setting black box outside above-mentioned target generator, described black box is by metal cabinet or the black cloth of blackening process
Cover.
A kind of distortion method of testing of f- θ optical system it is characterised in that：The method comprising the steps of：
1) target generator is fixed on long guideway object stage, by the movement of long guideway, provides the mesh of different distance
Mark；
2) long guideway is arranged on turntable, f- θ optical system is contained on special tooling；Long guideway moves forward and backward, and makes
Target is located at the standard operating distance of f- θ optical system, and target is received by as analyzer after f- θ optical system imaging；
3) light that light source sends is changed into collimated light outgoing after condenser lenss, after filtered is converted to required wavelength,
Again pass by condenser lenss and illuminate star orifice plate, the star orifice plate being illuminated reduces imaging after target micro mirror, carries as final goal
Supply tested f- θ optical system；
4) final goal is received by a detector as after imaged object lens；
5) corresponding parameter is set in a computer, and auto-control software controls turntable to rotate standard angle, links simultaneously
Control three-dimensional mobile support in image planes vertically tested optical system translation, now can on the detector as analyzer display target
Through f- θ optical system imaging, the angle that collection turntable rotates, three-dimensional move the length of support movement, target image simultaneously；
6) auto-control software controls turntable to rotate in f- θ optical system field of view, after often turning over an angle of visual field, completes
Control collecting work, obtain a series of turntable angle ωi, length y of three-dimensional mobile supportiAnd target image；
7) read the positional information l of punctate opacity of the cornea picture in target imageI, calculate f- θ optical system further according to distortion algorithm different
The distortion of visual field.
Step 7) in distortion algorithm computational methods be：
δ y=yi-f·ωi(1)
δ y is absolute distortion, yiIt is the amount of movement of three-dimensional mobile support, f is optimal computed focal length, ωiIt is that turntable turns over
Angle, lIIt is the target punctate opacity of the cornea picture that goes out of software interpretation coordinate position on the detector.
It is an advantage of the invention that：
1) offer of different object distances target can be provided simultaneously；
2) target simulator is driven to rotate by turntable, it is possible to achieve to have the offer of curved surface effect target；
3) it is designed with position in target simulator and assigns optical filter and weakener, the emission spectrum of target can be adjusted
With signal strength to meet the demarcation needs of different optical systems；
4) demarcation of different object distances, different operating spectral coverage optical system can be realized using this device, there is versatility, work
Make efficiency high；
5) certainty of measurement is high, and relative distortion stated accuracy can reach ten thousand/.
Brief description
Fig. 1 is the structural representation of the present invention；
Specific embodiment
The present invention is a kind of distortion testing device of f- θ optical system, including turntable 1, long guideway 2, by light source 4, collimation
Mirror 5, optical filter 6, condenser lenss 7, star orifice plate 8, target micro mirror 9 composition target generator, special tooling 11, by image-forming objective lens
12nd, detector 13, the picture analyzer of three-dimensional mobile support 14 composition, computer 15, platform 16 form, and computer 15 includes automatically
Control software, calculating process software；Target generator is arranged on the optical system object space being calibrated, and is marked as analyzer is arranged on
Determine the image space of optical system, moving component is connected with computer, its motion is controlled by auto-control software.
The effect of turntable 1 is to drive target generator to rotate, and provides the target of the outer visual field of axle for f- θ optical system, permissible
It is automatically controlled or manual form, the instrument of precision corner can be provided；The effect of long guideway 2 is to drive target generator straight line
Motion, provides the target of limited working distance, can be manual or automatically controlled or other forms for f- θ optical system
Line slideway or translation stage etc.；The effect of black box 3 is, in being placed on the optical element of target generator, to prevent external light source
Interference, affect test result, metal cabinet can carry out blackening process or got up with black cloth cover；
Light source 4 can be all objects that can light such as Halogen light, can illuminate target graticle, simply light source
Brightness and spectral region different and it is desirable to size is as little as possible；The effect of collimating mirror 5 is to be collimated light source 4 energy；Filter
The effect of mating plate 6 is the needs according to tested f- θ optical system, and light source 4 is filtered, and is supplied to f- θ optical system needs
Spectral region；The effect of condenser lenss 7 is again light source to be entered line convergence；Star orifice plate 8 is in order to f- θ optical system to be tested
System provides imageable target；The effect of target micro mirror 9 is to zoom in and out star orifice plate 8, so can add star orifice plate 8 size
Greatly, save the unmanageable difficult problem in starlet hole, and more energy can be collected；The effect of special tooling 11 is to support quilt
Photometry system, and it is easy to the adjustment of optical system；
As the effect of analyzer is to be received target picture formed by through tested optical system；Using detector 13 it is
Watch in real time in order to many people, the optical system of any spectral coverage can be tested, and can gather after image is used for
Continuous result calculates and processes；Three-dimensional mobile support 14 can drive image-forming objective lens and detector along before tested system optical axis
Motion finds image planes it is possible to drive image-forming objective lens tested system optical axis side-to-side movement vertical with detector afterwards, gathers axle
The information of outer visual field target picture, in order to improve measuring accuracy, the movement needs of left and right directions can provide the high length of precision comparison
Degree information, can be the precise mobile platform with digital display or grating scale or the length being given using laser ranging method is transported
Dynamic information.
Auto-control software can control turntable 1, long guideway 2, three-dimensional mobile support 14 to be moved as required；Calculate
Process a kind of algorithm that software is with reference to the distortion of tested design of Optical System Practical Calculation；The effect of optical table 16 is to place it
His equipment, is easy to debugging measurement, can be any platform, support, as long as carrying other equipment that can be reliable and stable.
The specific work process of the present invention and principle：
The operation principle of target generator：The light that light source 4 sends is changed into collimated light outgoing after condenser lenss 5, filtered 6
After wavelength required for being converted to, again pass by condenser lenss 7 and illuminate star orifice plate 8, the star orifice plate 8 being illuminated is through target micro mirror 9
After reduce imaging, be supplied to tested f- θ optical system as final goal；
Target generator is fixed on long guideway 2 object stage, by the movement of long guideway 2, different distance can be provided
Target；Long guideway 2 is arranged on turntable 1, then f- θ optical system is contained on special tooling 11；Move before and after long guideway 2
Dynamic, so that target is located at the standard operating distance of f- θ optical system, target is connect by as analyzer after f- θ optical system imaging
Receive；
Operation principle as analyzer：After the imaged object lens of target picture 12 are imaged, are received by detector 13, complete
The collection of whole image；Adjustment target generator optical axis, f- θ system optical axis and the picture analyzer optical axis are located on straight line,
Adjust as the three-dimensional mobile support 14 of analyzer is so as to be located at optimum image plane position along f- θ system optical axis direction, start to survey
Examination；
Corresponding parameter is set in the computer 15, and auto-control software controls turntable 1 to rotate standard angle, links simultaneously
Control three-dimensional mobile support 14 in image planes vertically tested optical system translation, now can be aobvious on the detector 13 as analyzer
Show target through f- θ optical system imaging, collection turntable 1 rotates simultaneously angle, the length of three-dimensional mobile support 15 movement,
Target image；
Auto-control software controls turntable 1 to rotate in f- θ optical system field of view, after often turning over an angle of visual field, completes
Control collecting work, thus obtain a series of turntable angle ωi, length y of three-dimensional mobile supportiAnd target image；
Process software using calculating, read the positional information lI of punctate opacity of the cornea picture in target image, then calculate f- θ optical system not
Distortion with visual field；
Distortion algorithm is to produce principle according to distortion, surveys different visual field image heights and corresponding visual field in optical system image planes
Angle, is fitted obtaining pinpointed focus to full filed focal length using weighted least-squares method.Then turned with turntable by pinpointed focus
Dynamic standard angle calculates theoretical image height, and the difference calculating theoretical image height with actual measurement image height is absolute distortion δ y.
δ y=yi-f·ωi(1)
Wherein f is optimal computed focal length, and computing formula is as follows：
δ y is absolute distortion, yiIt is the amount of movement of three-dimensional mobile support, f is optimal computed focal length, ωiIt is that turntable turns over
Angle, lIIt is the target punctate opacity of the cornea picture that goes out of software interpretation coordinate position on the detector.
Claims (2)
1. a kind of distortion method of testing of f- θ optical system it is characterised in that：The method comprising the steps of：
1) target generator is fixed on long guideway object stage, by the movement of long guideway, provides the target of different distance；
2) long guideway is arranged on turntable, f- θ optical system is contained on special tooling；Long guideway moves forward and backward, and makes target
At the standard operating distance of f- θ optical system；
3) light that light source sends is changed into collimated light outgoing after condenser lenss, after filtered is converted to required wavelength, again
Illuminate star orifice plate through condenser lenss, the star orifice plate being illuminated reduces imaging after target micro mirror, is supplied to as final goal
Tested f- θ optical system；
4) adjustment target generator optical axis, f- θ system optical axis and the picture analyzer optical axis are located on straight line, along f- θ light
Learn systematic optical axis direction to adjust as the three-dimensional mobile support of analyzer is so as to be located at optimum image plane position；
5) corresponding parameter is set in a computer, and auto-control software controls turntable to rotate standard angle, coordinated signals simultaneously
Three-dimensional mobile support in image planes vertically tested optical system translation, now can on the detector as analyzer display target through f-
θ optical system imaging, the angle that collection turntable rotates, three-dimensional move the length of support movement, target image simultaneously；
6) auto-control software controls turntable to rotate in f- θ optical system field of view, after often turning over an angle of visual field, completes to control
Collecting work, obtains a series of turntable angle ωi, length y of three-dimensional mobile supportiAnd target image；
7) read the positional information l of punctate opacity of the cornea picture in target imageI, calculate f- θ optical system difference visual field further according to distortion algorithm
Distortion.
2. f- θ optical system according to claim 1 distortion method of testing it is characterised in that：Described step 7) in abnormal
Becoming algorithm computational methods is：
δ y=yi-f·ωi(1)
δ y is absolute distortion, yiIt is the amount of movement of three-dimensional mobile support, f is optimal computed focal length, ωiIt is the angle that turntable turns over,
lIIt is the target punctate opacity of the cornea picture that goes out of software interpretation coordinate position on the detector.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310468730.XA CN103499433B (en) | 2013-09-30 | 2013-09-30 | Distortion calibration method for f-theta optical system |
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| CN201310468730.XA CN103499433B (en) | 2013-09-30 | 2013-09-30 | Distortion calibration method for f-theta optical system |
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| CN103499433B true CN103499433B (en) | 2017-02-15 |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104865047B (en) * | 2014-02-24 | 2017-08-25 | 九骅科技股份有限公司 | The optical detection apparatus of combined type object distance |
| CN106153302B (en) * | 2015-03-24 | 2019-03-12 | 北京威斯顿亚太光电仪器有限公司 | A kind of measurement method for rigid pipe endoscope image deformation |
| CN107063644B (en) * | 2017-06-05 | 2020-06-12 | 上海航天测控通信研究所 | Finite object distance distortion measuring method and system |
| CN107796600A (en) * | 2017-10-24 | 2018-03-13 | 大族激光科技产业集团股份有限公司 | A kind of method of testing and test system of the uniform performance of f theta focus lamps |
| CN110806572B (en) * | 2019-11-18 | 2024-05-07 | 中国科学院上海技术物理研究所 | Device and method for testing distortion of long-focus laser three-dimensional imager based on angle measurement method |
| CN111665023B (en) * | 2020-06-24 | 2021-10-12 | 中国科学院西安光学精密机械研究所 | Telescope distortion measuring device and method |
| CN112083578B (en) * | 2020-08-26 | 2021-06-22 | 中国科学院西安光学精密机械研究所 | Target simulator for image surface docking of photoelectric equipment, debugging system and method |
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| JPS56161566A (en) * | 1980-05-16 | 1981-12-11 | Hitachi Ltd | Optical system for information recording |
| JPS6229361A (en) * | 1985-07-30 | 1987-02-07 | Sharp Corp | Frequency fine tuning circuit for laser printer |
| JPH01200218A (en) * | 1988-02-03 | 1989-08-11 | Nec Corp | Optical plotting device |
| KR960007184A (en) * | 1994-08-30 | 1996-03-22 | 이형도 | Laser scanning device for laser printer |
| JPH08305841A (en) * | 1994-12-05 | 1996-11-22 | Ritsumeikan | Distorted image correcting display device |
| CN2519264Y (en) * | 2001-12-11 | 2002-10-30 | 中国科学院光电技术研究所 | Measuring and testing device for super wide angle lens distortion |
| CN2558982Y (en) * | 2002-08-16 | 2003-07-02 | 中国科学院西安光学精密机械研究所 | Superwide field optic system distortion measuring device |
| NL2004777C2 (en) * | 2010-05-28 | 2011-11-29 | Dovideq Holding B V | DEVICE FOR TESTING AN OPTION. |
| JP5871601B2 (en) * | 2011-12-15 | 2016-03-01 | キヤノン株式会社 | Apparatus, method, and Talbot interferometer for calculating aberration of test optical system |
| CN102638674A (en) * | 2012-01-18 | 2012-08-15 | 宁波捷宏信息技术有限公司 | Omnidirectional visual detecting, analyzing and warning system on basis of fisheye correction technology |
| CN102706536B (en) * | 2012-03-20 | 2014-11-12 | 浙江大学 | Device and method for automatically measuring distortion of optical system with wide field of view |
| CN203011670U (en) * | 2012-12-28 | 2013-06-19 | 中国科学院西安光学精密机械研究所 | Object simulation device |
| CN203606107U (en) * | 2013-09-30 | 2014-05-21 | 中国科学院西安光学精密机械研究所 | Calibration device for distortion of f-theta optical system |
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