CN205607625U - Heavy -calibre long -focus remote sensing camera distortion measuring device based on TDI -CCD - Google Patents
Heavy -calibre long -focus remote sensing camera distortion measuring device based on TDI -CCD Download PDFInfo
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- CN205607625U CN205607625U CN201620275311.3U CN201620275311U CN205607625U CN 205607625 U CN205607625 U CN 205607625U CN 201620275311 U CN201620275311 U CN 201620275311U CN 205607625 U CN205607625 U CN 205607625U
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Abstract
The utility model relates to an in TDI CCD's heavy -calibre long -focus remote sensing camera distortion measuring device and method, including collimator, two -dimentional revolving stage, mechanical shutter, total mark ball, asterism target, TDI has TDI arranged to CCD long -focus heavy -calibre remote sensing camera on the two -dimentional revolving stage CCD long -focus heavy -calibre remote sensing camera, TDI CCD long -focus heavy -calibre remote sensing camera is gone into pupil department and has been arranged collimator, and mechanical shutter, asterism target, total mark ball have been arranged in proper order to collimator guang shu entry end. Do you make TDI the work of CCD linear array remote sensing camera lets the mechanical shutter synchronous with the camera exposure in the area array mode of forming images simultaneously, and the asterism target passes through collimator as camera formation of image target, and an asterism formation of image of every completion lets revolving stage along angle of the perpendicular total mark orientation of TDI sensor rotation. Like this ergodic full wafer sensor obtains many asterisms like the image in different positions, to these asterisms like the exact position match calculation with revolving stage rotation angle, just can obtain TDI simultaneously CCD linear array remote sensing camera reaches the parallel perpendicularly and pushes away the distortion coefficient who sweeps the direction.
Description
Technical field
This utility model relates to optomechanical arts, particularly relates to a kind of large-aperture long-focus based on TDI-CCD
Remote sensing camera distortion measurement device.
Background technology
In the imaging process of camera, the light scattered by object converges in camera by the optical system of camera
Sensor on, sensor carries out opto-electronic conversion, quantification treatment, final obtains the image similar to object.
In the ideal case, image is being geometrically on all four with object.In actual imaging, due to optics
Lens construction characteristic, as being constantly present certain geometric distortion between thing, here it is the distortion of imaging system.
In the application higher to geometric parameter requirement, need the geometric distortion of image is corrected, eliminate or reduce
The camera distortion impact on imaging.In this case it is necessary to the distortion to optical system measures, it is thus achieved that
On sensor, the geometry between each pixel and geometric position and preferable picture is poor, based on this to every piece image
Carry out Geometric corrections.
In the battle array imaging system of face, distortion measurement is relatively simple.For small-bore imaging system, can be in order to
With being full of the standard target surface imaging of whole visual field, obtain abnormal by the mapping relations as reference point each with target surface
Variable coefficient；For heavy caliber imaging system, imaging system can be placed on turntable, utilize punctate opacity of the cornea target to become
Picture, controls turntable and makes punctate opacity of the cornea picture travel through sensor cover at certain intervals, rotate ginseng by the position of picture with turntable
The mapping relations of number obtain distortion factor.
For TDI-CCD heavy caliber, long-focus remote sensing camera, its imaging mode is for pushing away the pattern of sweeping, and conventional is abnormal
Become method of testing similar with face battle array formation method: imaging system be placed on turntable, utilize punctate opacity of the cornea target imaging,
Confucius and turntable make the interval traversal line array sensor that punctate opacity of the cornea picture is the most certain, rotate ginseng by the position of picture with turntable
The mapping relations of number obtain distortion factor.Owing to normal operation of sensor obtains in push-scanning image pattern, this mode
As non-punctate opacity of the cornea, and be parallel to push away the lines sweeping direction.Position relationship between lines and turntable rotational parameters
Map, thus can calculate acquisition and be perpendicular to push away the distortion factor sweeping on direction.Sweep on direction owing to not pushing away
Positional information, just cannot calculate acquisition and push away the distortion factor sweeping on direction.
For TDI-CCD heavy caliber, long-focus remote sensing camera, want to obtain the parallel distortion factor pushing away and sweeping direction,
It is accomplished by arranging on ground with reference to target, allows camera target carry out push-scanning image, then according to reference to target picture
The mapping relations of geometric parameter and reference target cursor position parameter obtain the distortion factor of camera and (push away and sweep direction and hang down
Directly push away and sweep direction).Owing to arranging limited amount with reference to target, the distortion factor precision therefore obtained would not be too
Height, can cause the distortions correction of final image to have bigger residual error.
Summary of the invention
Technical problem to be solved in the utility model is to provide a kind of large-aperture long-focus based on TDI-CCD
Remote sensing camera distortion measurement device, reaches easy to obtain high-precision pushing away in laboratory and sweeps direction distortion system
The beneficial effect of number.
For solving above-mentioned technical problem, this utility model be the technical scheme is that
A kind of large-aperture long-focus remote sensing camera distortion measurement device based on TDI-CCD, its special character are provided
It is: include collimator, dimensional turntable, mechanical shutter, integrating sphere, punctate opacity of the cornea target and TDI-CCD focal length
TDI-CCD long-focus heavy caliber remote sensing camera it is disposed with on heavy caliber remote sensing camera, described dimensional turntable,
Being disposed with collimator at TDI-CCD long-focus heavy caliber remote sensing camera entrance pupil, collimator optical input end depends on
Secondary it is disposed with mechanical shutter, punctate opacity of the cornea target and integrating sphere.
The switch motion of described mechanical shutter is controlled by TDI-CCD long-focus heavy caliber remote sensing camera.
Fill based on a kind of large-aperture long-focus remote sensing camera distortion measurement based on TDI-CCD of the present utility model
The method put, comprises the following steps:
1) adjust dimensional turntable, make punctate opacity of the cornea target picture fall in the biography of TDI-CCD long-focus heavy caliber remote sensing camera
Sensor center, TDI-CCD long-focus heavy caliber remote sensing camera carries out once face battle array imaging, then by dimensional turntable
Current location is set to turntable zero-bit；
2) assume TDI-CCD push away sweep direction be X to, be perpendicular to push away that to sweep direction be Y-direction, adjust dimensional turntable
Azimuth, makes punctate opacity of the cornea target in TDI-CCD long-focus heavy caliber remote sensing camera+Y-direction, often moves 5～10 pictures
Carrying out once face battle array imaging after unit, record dimensional turntable each time adjusts orientation angles, until moving to sensing
+ Y the termination of device；
3) adjust dimensional turntable back to zero position, then make punctate opacity of the cornea target in TDI-CCD long-focus heavy caliber remote sensing phase
Machine-Y-direction, carries out once face battle array imaging after often moving 5～10 pixels, record dimensional turntable each time adjusts
Orientation angles, until moving to-Y the termination of sensor；
4) with the middle pixel of sensor as zero (0,0), center of gravity derivation algorithm is utilized to calculate each star
Point target picture centre coordinate on a sensor, corresponding according between each imaging and the azimuth of dimensional turntable
Relation, use area array sensor imaging system distortion factor method for solving solve each picture point X to and Y
To distortion value, recycling least square fitting go out the equation that distorts, bring remaining cell coordinate into distortion formula
After can obtain the distortion value of this pixel.
The face battle array imaging that described TDI-CCD large-aperture long-focus remote sensing camera is the most complete comprises two actions:
4.1) exposure；4.2) electric charge transfer；Described mechanical shutter exposes at TDI-CCD large-aperture long-focus remote sensing camera
Light time opens, and closes when TDI-CCD large-aperture long-focus remote sensing camera electric charge shifts.
Face battle array imaging each time just can obtain a punctate opacity of the cornea picture.
The beneficial effects of the utility model are:
1, for TDI-CCD large-aperture long-focus remote sensing camera, in its normal mode of operation (push-scanning image)
Under be merely able to obtain and be perpendicular to push away the distortion factor sweeping direction, want to obtain and push away the distortion factor sweeping direction, can only
Reference point is set in imaging in-orbit, enters according to the corresponding relation between reference point physical location and the picture of reference point
Row solves acquisition, due to the relation of reference point quantity, the distortion limited precision solved.This utility model is permissible
Complete all distortion relevant parameters at laboratory to measure, control punctate opacity of the cornea as quantity, raising camera according to required precision
Distortion factor precision；
2, by once having tested the distortion situation of TDI-CCD large-aperture long-focus remote sensing camera both direction,
Improve distortion testing efficiency；
3, all tests complete at laboratory, and principle is simple, easily realizes；
4, after completing laboratory distortion measurement, it is not necessary to carry out outfield reference point imaging test again, can save big
Amount funds.
Accompanying drawing explanation
Fig. 1 is this utility model each equipment relativeness figure；
Fig. 2 is TDI-CCD large-aperture long-focus remote sensing camera to be tied punctate opacity of the cornea target imaging under mode of operation pushing away to sweep
Really, in figure, a lattice represents a pixel；
Fig. 3 is TDI-CCD large-aperture long-focus remote sensing camera sweeps mode of operation punctate opacity of the cornea target imaging pushing away, different
The punctate opacity of the cornea target of position with export image accordingly, in figure, a lattice represents a pixel；
Fig. 4 is that TDI-CCD large-aperture long-focus remote sensing camera utilizes synchronization mechanism shutter to punctate opacity of the cornea target face battle array mould
Formula imaging results, in figure, a lattice represents a pixel；
Fig. 5 is that TDI-CCD large-aperture long-focus remote sensing camera utilizes synchronization mechanism shutter that punctate opacity of the cornea is told in person mould
Formula imaging results, the punctate opacity of the cornea target of diverse location with export image accordingly, in figure, a lattice represents a picture
Unit.
In figure, 10-TDI-CCD large-aperture long-focus remote sensing camera, 11-dimensional turntable, 12-collimator,
13-mechanical shutter, 14-punctate opacity of the cornea target, 15-integrating sphere.
Detailed description of the invention
With specific embodiment, this utility model is described in detail below in conjunction with the accompanying drawings.
Camera based on TDI-CCD large-aperture long-focus sensor belongs to the one of line-scan digital camera, and it normally works
Mode is scan-type, and i.e. when imaging, camera to exist certain relative motion with being imaged target, and moves
Speed to be mated with imaging the time of integration, otherwise arises that and pushes away the smear sweeping on direction.Be imaged target with
Time between camera without relative motion, imaging results is to sweep the nicking that direction is parallel, such as Fig. 2 with pushing away.
Camera optics distortion measurement is carried out under TDI-CCD large-aperture long-focus remote sensing camera normal mode of operation
Time, simulate infinite point target with the parallel ring of light, maintain punctate opacity of the cornea target in fixed position, often rotate dimensional turntable
Certain angle, is equivalent to a various location punctate opacity of the cornea target imaging for camera.Due to TDI-CCD
Sensor imaging characteristics, is that diverse location is parallel to push away in image planes to diverse location punctate opacity of the cornea target imaging acquisition
Sweep the striped picture (such as Fig. 3) in direction (X to), the distance between striped picture between different punctate opacity of the cornea targets away from
From correspondence, namely corresponding with the angle that dimensional turntable rotates.Solve the spacing between striped picture and dimensional turntable
Mapping relations between the anglec of rotation, it is possible to obtain each picture point pushes away the distortion swept on direction (Y-direction) being perpendicular to,
Simulate the distortion equation of the direction, it is possible to calculate all pixels and sweep on direction (Y-direction) being perpendicular to push away
Distortion factor.Sweep the positional information in direction (X to) owing to striped picture does not push away, thus cannot obtain and push away
Sweep the distortion in direction (X to).
Change the working method of TDI-CCD large-aperture long-focus remote sensing camera, make it be operated in frame transfer face battle array and become
As under pattern.If TDI-CCD often row pixel number is M, integration progression is N, then every two field picture size
For M × N.When face battle array imaging, expose complete being required for each time and one-tenth mirror charge is transferred out, in this phase
Between photosensitive pixel to stop exposure.Here a mechanical shutter Tong Bu with camera exposure is devised,
Shutter is opened during TDI-CCD exposure；Shutter is closed when TDI-CCD transfer charge.Imaging mould is told in person this
Under formula, the picture that static punctate opacity of the cornea target is become by TDI-CCD remote sensing camera is not striped picture, but punctate opacity of the cornea picture,
Such as Fig. 4.
In these cases, dimensional turntable is rotated, it is thus achieved that turntable punctate opacity of the cornea picture at different angles, punctate opacity of the cornea picture was both
Contain to be perpendicular to push away and sweep direction (Y) and contain again and push away the positional information (such as Fig. 5) sweeping direction (X to),
Thus can calculate the distortion of camera both direction.
Claims (2)
1. a large-aperture long-focus remote sensing camera distortion measurement device based on TDI-CCD, it is characterised in that:
Including collimator, dimensional turntable, mechanical shutter, integrating sphere, punctate opacity of the cornea target and the big mouth of TDI-CCD long-focus
Footpath remote sensing camera, described dimensional turntable is disposed with TDI-CCD long-focus heavy caliber remote sensing camera, TDI-CCD
Being disposed with collimator at long-focus heavy caliber remote sensing camera entrance pupil, collimator optical input end has been sequentially arranged
Mechanical shutter, punctate opacity of the cornea target and integrating sphere.
A kind of large-aperture long-focus remote sensing camera based on TDI-CCD the most according to claim 1 distorts
Measurement apparatus, it is characterised in that: the switch motion of described mechanical shutter is by TDI-CCD long-focus heavy caliber remote sensing
Camera control.
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| CN201620275311.3U CN205607625U (en) | 2016-04-05 | 2016-04-05 | Heavy -calibre long -focus remote sensing camera distortion measuring device based on TDI -CCD |
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| CN201620275311.3U CN205607625U (en) | 2016-04-05 | 2016-04-05 | Heavy -calibre long -focus remote sensing camera distortion measuring device based on TDI -CCD |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106643799A (en) * | 2016-12-22 | 2017-05-10 | 中国科学院西安光学精密机械研究所 | Easily assembled, debugged and integrated target wheel type star point plate focusing device |
| CN108931357A (en) * | 2017-05-22 | 2018-12-04 | 宁波舜宇车载光学技术有限公司 | Test target and corresponding camera lens MTF detection system and method |
| CN113050108A (en) * | 2021-03-23 | 2021-06-29 | 湖南盛鼎科技发展有限责任公司 | Electronic boundary address vision measurement system and measurement method |
-
2016
- 2016-04-05 CN CN201620275311.3U patent/CN205607625U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106643799A (en) * | 2016-12-22 | 2017-05-10 | 中国科学院西安光学精密机械研究所 | Easily assembled, debugged and integrated target wheel type star point plate focusing device |
| CN106643799B (en) * | 2016-12-22 | 2023-09-01 | 中国科学院西安光学精密机械研究所 | Target wheel type star point plate focusing device easy to assemble and integrate |
| CN108931357A (en) * | 2017-05-22 | 2018-12-04 | 宁波舜宇车载光学技术有限公司 | Test target and corresponding camera lens MTF detection system and method |
| CN108931357B (en) * | 2017-05-22 | 2020-10-23 | 宁波舜宇车载光学技术有限公司 | Test target and corresponding lens MTF detection system and method |
| CN113050108A (en) * | 2021-03-23 | 2021-06-29 | 湖南盛鼎科技发展有限责任公司 | Electronic boundary address vision measurement system and measurement method |
| CN113050108B (en) * | 2021-03-23 | 2024-01-09 | 湖南盛鼎科技发展有限责任公司 | Electronic world site vision measurement system and measurement method |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CB03 | Change of inventor or designer information |
Inventor after: Zhang Jian Inventor after: Xu Zhe Inventor after: Li Xuyang Inventor after: Zhao Yan Inventor after: Zhou Yan Inventor after: Li Ailing Inventor before: Zhang Jian Inventor before: Xu Zhe Inventor before: Li Xuyang Inventor before: Zhao Yan Inventor before: Zhou Yan Inventor before: Li Ailing |
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| COR | Change of bibliographic data |