CN104243971A - Device and method for detecting aerial photography camera exposure delay time - Google Patents
Device and method for detecting aerial photography camera exposure delay time Download PDFInfo
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- CN104243971A CN104243971A CN201410370460.3A CN201410370460A CN104243971A CN 104243971 A CN104243971 A CN 104243971A CN 201410370460 A CN201410370460 A CN 201410370460A CN 104243971 A CN104243971 A CN 104243971A
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Abstract
The invention provides a device and method for detecting aerial photography camera exposure delay time, and belongs to the field of aerial photography camera calibration and detection. The device and method aim to solve the problems that in the prior art, ground control points need to be laid and imaging precision is low. An FPGA master controller controls a light source to light by means of a light source drive, and light is radiated to a DMD after penetrating through an illumination optical system and a beam splitter prism; the FPGA master controller controls the DMD to produce light modulation signal through a DMD drive circuit and sends out an exposure pulse control signal to an aerial photography camera through an exposure pulse port; image information collected by the aerial photography camera is sent to the FPGA master controller, and the FPGA master controller transmits image grey information and delay time information to a portable computer through an RS 422 port circuit. Delay time Td of time when the DMD is turned to be at 12 degrees relative to the moment when the exposure pulse control signal is sent reflects exposure delay time of the aerial photography camera.
Description
Technical field
The invention belongs to aerial camera and demarcate detection field, be specifically related to a kind of aerial camera exposure checkout gear time of delay and detection method.
Background technology
In recent years, unmanned plane is taken photo by plane with advantages such as low cost, maneuverabilities, fast response, shows very wide application prospect in geographical mapping field.Along with appearance and the fast development thereof of POS, the direct geographic positioning technology based on POS is more and more ripe, and aerial camera and POS are integrated into and provide the foundation without the remotely sensing image geometric correction at control point and splicing.
Aerial camera and POS Integrated predict model are when direct geo-location, flying-controlled box real-time reception and record POS export position and attitude information, and send exposed pulse signal according to the air route exposure point of mission planning to aerial camera, control camera shooting and memory image.The attitude of POS when being sent according to exposed pulse by software on ground after completing and positional information, complete the geometric correction to Aerial Images and splicing, and the time precision of uniting of aerial camera and POS directly affects mapping precision.Because aerial camera is with mechanical shutter, after receiving exposed pulse signal, need to open shutter and complete the functions such as the sequencing control of partial circuit, the time delay of Millisecond is had between actual exposure moment and pulse exposure signal, cause between aerial camera and POS system time system precision not high, reduce mapping precision.
Two kinds are had for the existing solution of the problems referred to above, the first lays a small amount of target control point, the attitude information exported by POS merges with the attitude information resolving out by ground target control point, improve aerial camera become figure and position and attitude information matching precision; The second is transformation aerial camera, makes its primary detector that resets after shutter is opened, and restarts exposure, and export a synchronizing signal to POS system, POS system calculates position and attitude information according to this synchronizing signal interpolation method simultaneously.First method still needs to lay ground control point, and when large regions geographical mapping, workload is huge; Second method then adds the improvement cost of aerial camera and POS system, simultaneously because exposure has regular hour length, exposes start time and becomes to scheme moment still free deviation.
Summary of the invention
The object of the invention is to propose a kind of aerial camera exposure checkout gear time of delay and detection method, solving needing that prior art exists lays ground control point and the low problem of mapping precision, improve between aerial camera and POS system time unite precision, thus raising mapping precision.
For achieving the above object, a kind of aerial camera exposure checkout gear time of delay of the present invention comprises RS422 interface circuit, FPGA master controller, light source drive, light source, lamp optical system, DMD drive circuit, DMD (Digital Micromirror Device), Amici prism, projection matching optical system, exposed pulse interface and CameraLink image interface;
Described FPGA master controller is connected with portable computer by RS422 interface circuit, and FPGA master controller controls light source luminescent by light source drive, and the light that light source sends is unified after Amici prism by illumination optical system and incided on DMD;
FPGA master controller produces light modulating signal by DMD drive circuit control DMD, and sends exposed pulse control signal by exposed pulse interface to aerial camera;
The image information that aerial camera collects passes to FPGA master controller through CameraLink image interface, and gradation of image information and exposure delay time information are passed to portable computer by RS422 interface circuit by FPGA master controller.
Based on a kind of detection method of aerial camera exposure checkout gear time of delay, comprise the following steps:
Step one: portable computer sends sense command by RS422 interface, and control appliance is started working; And send time for exposure T
exp, maximum delay time T
dmax, stepping time T
stepto FPGA master controller;
Step 2: after the sense command described in FPGA master controller receiving step one, carry out equipment self-inspection survey, sends self-inspection state bag to portable computer by RS422 interface after completing;
Step 3: FPGA master controller controls light source by light source drive and opens, and wait for a period of time T
stable, control DMD assembly powers on, wherein, and T
stablerefer to that energy of light source stablizes output time;
Step 4: FPGA master controller sends exposed pulse control signal by exposed pulse interface to aerial camera, the view data exported by CameraLink interface aerial camera, and the average value P of real-time computed image gray scale
ave;
Step 5: overturn as+12 ° by DMD drive circuit control DMD, hold time as T
exp, DMD upset is that the moment of+12 ° is relative to exposed pulse control signal delivery time T time of delay in step 4
d(1), wherein, initial value T
d(1)=T
dmax;
Step 6: by T time of delay
dand gradation of image average value P (1)
ave(1) packing sends to portable computer by RS422 interface;
Step 7: repeat step 5 and step 6, the moment that continuous adjustment DMD upset is+12 ° is relative to the delay time value T of the exposed pulse control signal delivery time in step 4
d(i), wherein, T
d(i)=T
d(i-1)-T
step, until T
dtill (i)≤0, obtain many group delaing times T
d(i) and gradation of image average value P
ave(i);
Step 8: the many group delaing times T obtained according to step 7
d(i) and gradation of image average value P
avei () curve plotting, with T time of delay
di () is abscissa, image intensity value average value P
avei () is ordinate;
Step 9: matching is carried out to the curve obtained in step 8;
Step 10: according to the curve chart after matching in step 9, is aerial camera the time of delay that gradation of image mean value maximum point is corresponding and exposes time of delay;
Step 11: electricity under FPGA main controller controls DMD assembly and light source assembly, completes detection.
Beneficial effect of the present invention is: a kind of aerial camera exposure checkout gear time of delay of the present invention and detection method application, as master controller, produce light modulating signal by DMD (Digital Micromirror Device); Exposed pulse control signal is sent to aerial camera by FPGA master controller; Gather the view data of aerial camera output and carry out mean value computation; By the time of delay between adjustment exposed pulse signal and DMD driver' s timing, time of delay and the packing of gradation of image average are sent to portable computer by RS422 interface.When image intensity value is maximum, DMD upset is+12 ° of exposure time of delays being aerial camera time of delay relative to exposed pulse control signal delivery time, accurately measure the exposure time of delay of aerial camera, thus the time system precision that improve between aerial camera and POS system, solving needing that prior art exists lays ground control point and the low problem of mapping precision.
Adopt device of the present invention, the exposure time of delay of aerial camera can be accurately measured in laboratory conditions, do not need completely to lay ground control point, do not need to transform aerial camera and POS yet, measure the time delay be between figure moment and exposed pulse that obtains simultaneously, time system precision higher.
Accompanying drawing explanation
Fig. 1 is the system composition structured flowchart of a kind of aerial camera exposure checkout gear time of delay of the present invention;
Fig. 2 is the flow chart of a kind of aerial camera exposure detection method time of delay of the present invention;
Fig. 3 is timing diagram corresponding when utilizing the present invention to detect.
Embodiment
Below in conjunction with accompanying drawing, embodiments of the present invention are described further.
See accompanying drawing 1, a kind of aerial camera exposure checkout gear time of delay of the present invention comprises RS422 interface circuit, FPGA master controller, light source drive, light source, lamp optical system, DMD drive circuit, DMD (Digital Micromirror Device), Amici prism, projection matching optical system, exposed pulse interface and CameraLink image interface;
Described FPGA master controller is connected with portable computer by RS422 interface circuit, and FPGA master controller controls light source luminescent by light source drive, and the light that light source sends is unified after Amici prism by illumination optical system and incided on DMD;
FPGA master controller produces light modulating signal by DMD drive circuit control DMD, and sends exposed pulse control signal by exposed pulse interface to aerial camera;
The image information that aerial camera collects passes to FPGA master controller through CameraLink image interface, and image information is passed to portable computer by RS422 interface circuit by FPGA master controller.
Optical modulation device selects TI company model for " 0.7 XGA 2 × LVDS A " DMD, and design parameter is: resolution 1024 × 768, micro mirror size 13.68 μm × 13.68 μm.The digital nature being characterized in intrinsic makes noise extremely low; Be greater than the fill factor, curve factor of 90%; Device is extremely long for useful life.The corresponding pixel of each micro-reflector, flip-flop transition is 4 μ s.
FPGA master controller selects Xilinx company model to be the fpga chip of XCV5LX50, and this chip internal is integrated with OSEDES assembly, can realize the DDR transfer of data of 400MHz, makes DMD toggle frequency to reach more than 30KHz.
See accompanying drawing 2, based on a kind of detection method of aerial camera exposure checkout gear time of delay, comprise the following steps:
Step one: portable computer sends sense command by RS422 interface, and control appliance is started working; And send time for exposure T
exp, maximum delay time T
dmax, stepping time T
stepto FPGA master controller;
Step 2: after the sense command described in FPGA master controller receiving step one, carry out equipment self-inspection survey, as an equipment device state is normal, then send self-inspection state bag to portable computer by RS422 interface, notice portable computer enters measuring state; Otherwise pass through RS422 interface and send error condition bag to portable computer, notice portable computer device exists abnormal, and electric under needing control appliance, checkout facility is connection.
Step 3: FPGA master controller controls light source by light source drive and opens, and wait for a period of time T
stable, control DMD assembly powers on, wherein, and T
stablerefer to that energy of light source stablizes output time;
Step 4: FPGA master controller sends exposed pulse control signal by exposed pulse interface to aerial camera, the view data exported by Camera link interface aerial camera, and the average value P of real-time computed image gray scale
ave;
Step 5: overturn as+12 ° by DMD drive circuit control DMD, hold time as T
exp, DMD upset is that the moment of+12 ° is relative to exposed pulse control signal delivery time T time of delay in step 4
d(1), wherein, initial value T
d(1)=T
dmax;
Step 6: by T time of delay
dand gradation of image average value P (1)
ave(1) packing sends to portable computer by RS422 interface;
Step 7: repeat step 5 and step 6, the moment that continuous adjustment DMD upset is+12 ° is relative to the delay time value T of the exposed pulse control signal delivery time in step 4
d(i), (T
d(i)=T
d(i-1)-T
step), until T
dtill (i)≤0, obtain many group delaing times T
d(i) and gradation of image average value P
ave(i);
Step 8: the many group delaing times T obtained according to step 7
d(i) and gradation of image average value P
avei () curve plotting, with T time of delay
di () is abscissa, image intensity value average value P
avei () is ordinate;
Step 9: matching is carried out to the curve obtained in step 8;
Step 10: according to the curve chart after matching in step 9, is aerial camera the time of delay that gradation of image mean value maximum point is corresponding and exposes time of delay;
Step 11: electricity under FPGA main controller controls DMD assembly and light source assembly, completes detection.
Described maximum delay time T
dmaxvalue can arrange voluntarily according to different aerial cameras, described maximum delay time T
dmaxvalue be T
dmax≤ 5ms.
Increase time stepping time T
stepvalue can improve the speed of detection, but can certainty of measurement be reduced; Time for exposure T can be set to
exp1/100.
Operation principle of the present invention is: control micro-reflector by ' 0 ' or ' 1 ' loading numeral and overturn between+12 ° and-12 °.
First, after light source is opened, light incides on DMD after illumination optical system unifies Amici prism.When DMD micro-reflector flip angle is+12 °, the light of its reflection is by entering aerial camera after projection matching optical system; When micro-reflector flip angle is-12 °, the light of its reflection can not enter projection matching optical system.Controlling flip angle by FPGA is the time of+12 °, just can control the light energy entering aerial camera.
See accompanying drawing 3, secondly, when the time of exposure and the DMD of aerial camera overturn be constantly of+12 ° overlap completely time, aerial camera just can get maximum light energy, and gradation of image is the highest.According to this principle, the sequential of DMD upset+12 ° fixed by FPGA master controller, continuous adjustment sends to aerial camera exposed pulse relative to the time of delay of DMD Timing driver, gather the gray value of aerial camera output image simultaneously, when gradation of image is maximum, the time difference between the clock signal that exposed pulse and DMD overturn+12 ° is exactly time of delay of aerial camera exposure control signal.
Claims (2)
1. aerial camera exposure checkout gear time of delay, is characterized in that comprising RS422 interface circuit, FPGA master controller, light source drive, light source, lamp optical system, DMD drive circuit, DMD, Amici prism, projection matching optical system, exposed pulse interface and CameraLink image interface;
Described FPGA master controller is connected with portable computer by RS422 interface circuit, and FPGA master controller controls light source luminescent by light source drive, and the light that light source sends is unified after Amici prism by illumination optical system and incided on DMD;
FPGA master controller produces light modulating signal by DMD drive circuit control DMD, and sends exposed pulse control signal by exposed pulse interface to aerial camera;
The image information that aerial camera collects passes to FPGA master controller through CameraLink image interface, and gradation of image information and exposure delay time information are passed to portable computer by RS422 interface circuit by FPGA master controller.
2., based on the detection method of a kind of aerial camera exposure checkout gear time of delay according to claim 1, it is characterized in that, comprise the following steps:
Step one: portable computer sends sense command by RS422 interface, and control appliance is started working; And send time for exposure T
exp, maximum delay time T
dmax, stepping time T
stepto FPGA master controller;
Step 2: after the sense command described in FPGA master controller receiving step one, carry out equipment self-inspection survey, sends self-inspection state bag to portable computer by RS422 interface after completing;
Step 3: FPGA master controller controls light source by light source drive and opens, and wait for a period of time T
stable, control DMD assembly powers on, wherein, and T
stablerefer to that energy of light source stablizes output time;
Step 4: FPGA master controller sends exposed pulse control signal by exposed pulse interface to aerial camera, the view data exported by CameraLink interface aerial camera, and the average value P of real-time computed image gray scale
ave;
Step 5: overturn as+12 ° by DMD drive circuit control DMD, hold time as T
exp, DMD upset is that the moment of+12 ° is relative to exposed pulse control signal delivery time T time of delay in step 4
d(1), wherein, initial value T
d(1)=T
dmax;
Step 6: by T time of delay
dand gradation of image average value P (1)
ave(1) packing sends to portable computer by RS422 interface;
Step 7: repeat step 5 and step 6, the moment that continuous adjustment DMD upset is+12 ° is relative to the delay time value T of the exposed pulse control signal delivery time in step 4
d(i), wherein, T
d(i)=T
d(i-1)-T
step, until T
dtill (i)≤0, obtain many group delaing times T
d(i) and gradation of image average value P
ave(i);
Step 8: the many group delaing times T obtained according to step 7
d(i) and gradation of image average value P
avei () curve plotting, with T time of delay
di () is abscissa, image intensity value average value P
avei () is ordinate;
Step 9: matching is carried out to the curve obtained in step 8;
Step 10: according to the curve chart after matching in step 9, is aerial camera the time of delay that gradation of image mean value maximum point is corresponding and exposes time of delay;
Step 11: electricity under FPGA main controller controls DMD assembly and light source assembly, completes detection.
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| CN201410370460.3A CN104243971B (en) | 2014-07-30 | 2014-07-30 | A kind of aerial camera exposure checkout gear time of delay and detection method |
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| Publication Number | Publication Date |
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| CN104243971A true CN104243971A (en) | 2014-12-24 |
| CN104243971B CN104243971B (en) | 2016-03-02 |
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Cited By (9)
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| CN104764442A (en) * | 2015-04-15 | 2015-07-08 | 中测新图(北京)遥感技术有限责任公司 | Method and device for determining exposure time of aerial photogrammetric camera in light-small unmanned aerial vehicle |
| CN105578179A (en) * | 2016-01-04 | 2016-05-11 | 厦门理工学院 | System and method for detecting display frame rate of DMD (Digital Micro-mirror Device) |
| CN109489940A (en) * | 2018-11-02 | 2019-03-19 | 中国科学院西安光学精密机械研究所 | A kind of measurement method of optical imaging system accurate delay |
| CN110365955A (en) * | 2019-04-19 | 2019-10-22 | 吉林省智宸光电技术有限公司 | A kind of multichannel scenario simulation device circuit system |
| CN110971892A (en) * | 2019-11-27 | 2020-04-07 | 深圳市派科斯科技有限公司 | Exposure delay measuring method, device and storage medium |
| CN113641093A (en) * | 2021-06-23 | 2021-11-12 | 中国科学院紫金山天文台 | Scientific grade CCD/CMOS camera capable of recording time mark and star image scanning |
| CN114051134A (en) * | 2021-11-30 | 2022-02-15 | 西安瑞峰光电技术有限公司 | Camera Link interface camera output delay measuring method and system |
| CN114079707A (en) * | 2020-08-13 | 2022-02-22 | 深圳中科飞测科技股份有限公司 | Image acquisition method, image acquisition equipment, computer-readable storage medium and electronic equipment |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104764442A (en) * | 2015-04-15 | 2015-07-08 | 中测新图(北京)遥感技术有限责任公司 | Method and device for determining exposure time of aerial photogrammetric camera in light-small unmanned aerial vehicle |
| CN104764442B (en) * | 2015-04-15 | 2017-02-22 | 中测新图(北京)遥感技术有限责任公司 | Method and device for determining exposure time of aerial photogrammetric camera in light-small unmanned aerial vehicle |
| CN105578179A (en) * | 2016-01-04 | 2016-05-11 | 厦门理工学院 | System and method for detecting display frame rate of DMD (Digital Micro-mirror Device) |
| CN105578179B (en) * | 2016-01-04 | 2018-11-13 | 厦门理工学院 | The system and method for detecting DMD display frame rates |
| CN109489940A (en) * | 2018-11-02 | 2019-03-19 | 中国科学院西安光学精密机械研究所 | A kind of measurement method of optical imaging system accurate delay |
| CN110365955A (en) * | 2019-04-19 | 2019-10-22 | 吉林省智宸光电技术有限公司 | A kind of multichannel scenario simulation device circuit system |
| CN110971892A (en) * | 2019-11-27 | 2020-04-07 | 深圳市派科斯科技有限公司 | Exposure delay measuring method, device and storage medium |
| CN110971892B (en) * | 2019-11-27 | 2021-05-11 | 深圳市派科斯科技有限公司 | Exposure delay measuring method, device and storage medium |
| CN114079707A (en) * | 2020-08-13 | 2022-02-22 | 深圳中科飞测科技股份有限公司 | Image acquisition method, image acquisition equipment, computer-readable storage medium and electronic equipment |
| CN114079707B (en) * | 2020-08-13 | 2024-05-10 | 深圳中科飞测科技股份有限公司 | Image acquisition method, image acquisition device, computer-readable storage medium and electronic device |
| CN113641093A (en) * | 2021-06-23 | 2021-11-12 | 中国科学院紫金山天文台 | Scientific grade CCD/CMOS camera capable of recording time mark and star image scanning |
| CN113641093B (en) * | 2021-06-23 | 2022-08-05 | 中国科学院紫金山天文台 | Scientific grade CCD/CMOS camera capable of recording time mark and star image scanning |
| CN114051134A (en) * | 2021-11-30 | 2022-02-15 | 西安瑞峰光电技术有限公司 | Camera Link interface camera output delay measuring method and system |
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