CN104181805B - A kind of detection method of between-the-lens shutter closing time - Google Patents
A kind of detection method of between-the-lens shutter closing time Download PDFInfo
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- CN104181805B CN104181805B CN201410320971.4A CN201410320971A CN104181805B CN 104181805 B CN104181805 B CN 104181805B CN 201410320971 A CN201410320971 A CN 201410320971A CN 104181805 B CN104181805 B CN 104181805B
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Abstract
The detection method of a kind of between-the-lens shutter closing time belongs to Aero-Space technical field of imaging, method includes: between-the-lens shutter is close to the effective photosensitive area of area array CCD, place light source in front of the door soon, after shutter opening, area array CCD starts exposure, closes and read area array CCD each pixel gray value after reaching to preset time of exposure.Area array CCD performs double exposure imaging, and the time is respectively t1And t2(t2＞ t1).Each for second time imaging pixel gray value is deducted and obtains new image data for the first time.If the gray average of the corresponding pixel in transparent zone total with shutter is g in new image dataM, then film speed v of area array CCD pixel can be byCalculate.If shutter transparent zone correspondence pixel gray average is g when shutter starts to closeB, when losing conditions of exposure, correspondence pixel gray average in transparent zone is gN.Shutter loses closing time t of conditions of exposure from starting to be closed intoSCan be byCalculate.This between-the-lens shutter closing time detection method is simple, it is easy to implementing, shutter closing time accuracy of detection is better than 0.1ms.
Description
Technical field
The invention belongs to Aero-Space technical field of imaging, it is provided that between a kind of mirror during between-the-lens shutter Guan Bi
Between detection method.
Background technology
Between-the-lens shutter is in aviation stereo mapping imaging field extensive application.The Guan Bi of between-the-lens shutter
Time effects boat takes the photograph image quality, is the important indicator weighing between-the-lens shutter performance, has camera is the shortest
Effect time of exposure plays a decisive role.The detection of between-the-lens shutter closing course generally uses phototriode,
The luminous flux that in shutter closing course, phototriode photosensitive area receives changes, and causes photosensitive three poles
Pipe output voltage changes, and determines shutter closing course by the change of detection phototriode output voltage,
This detection method can only provide the outline process of shutter Guan Bi, it is difficult to determines that shutter loses conditions of exposure
Correct time.
Summary of the invention
The problem existed for background technology, the present invention devises the standard of a kind of between-the-lens shutter closing time
Really detection method.The present invention utilizes area array CCD (photoelectric coupled device) to detect shutter closing time.?
Under constant homogeneous illumination conditions, area array CCD pixel light exposure is linear with time of exposure；Surveying
Under conditions of obtaining area array CCD pixel film speed, according to correspondence pixel in transparent zone in shutter closing course
Light exposure, can calculate shutter Guan Bi correct time.
It is as follows that the present invention solves the technical scheme that technical problem used:
A kind of detection method of between-the-lens shutter closing time, the method includes following equipment: light source, in
Core type shutter and area array CCD, be close to between-the-lens shutter to be detected area array CCD photosensitive area and place, make
Combine closely between shutter and area array CCD, without light leak region；Fast placement homogeneous constant illumination light source in front of the door,
The method comprises the steps:
Step one: during area array CCD exposure for the first time, output image intensity value is Aij, time of exposure is t1；
During second time exposure, output image intensity value is Bij, time of exposure is t2(t2＞ t1), if twice imaging pair
The difference answering pixel gray value is Cij, i.e. Cij=Bij-Aij；
Step 2: by CijMiddle data obtain sequence M by sequential arrangement from big to smalli；If shutter always leads to light
The quantity of district's correspondence pixel is NT, NTCan be byCalculate, whereinFor bracket function, STFor
Shutter total transparent zone area, SPFor area array CCD single pixel area；Sequence MiFront NTIndividual data are fast
The gradation data that door total transparent zone pixel is corresponding, gMIt is taken as sequence MiFront NTThe average of individual dataUtilizeFormula can draw film speed v of area array CCD pixel；
Step 3: set transparent zone area in shutter closing course and reach to lose exposure during total transparent zone area p%
Optical condition, correspondence pixel quantity N in transparent zone when shutter loses conditions of exposureSCan be byMeter
Calculate；
Step 4: by AijMiddle data obtain sequence R by descending order arrangementi；Shutter loses exposure bar
The N that during part, transparent zone is correspondingSThe gray value of individual pixel is sequence RiFront NSIndividual data, shutter loses exposure
Transparent zone correspondence pixel gray value g during conditionNIt is taken as
Step 5: correspondence pixel gray value g in transparent zone when shutter just starts to closeBFor limit, shutter total transparent zone
The gray value of edge correspondence pixel, gBCan be byRiFormula calculates；UtilizeCan
Obtain shutter and lose the accurate closing time of conditions of exposure from starting to be closed into.
The invention has the beneficial effects as follows: the present invention be camera boat take the photograph imaging picture shifting amount control provide important depending on
According to.This between-the-lens shutter closing time detection method is simple, it is easy to implementing, closing time accuracy of detection is excellent
In 0.1ms.The clear electric charge function of area array CCD can eliminate the impact on testing result of the shutter opening process,
Guarantee is provided for accurately detection shutter closing time.
Accompanying drawing explanation
Fig. 1 one of the present invention between-the-lens shutter closing time detection method installation drawing.
Fig. 2 camera exposure of the present invention controls sequential chart.
Detailed description of the invention
With embodiment, the present invention is described in further details below in conjunction with the accompanying drawings.
The detection method of a kind of between-the-lens shutter closing time, as it is shown in figure 1, the method includes as divided into
Standby: integrating sphere control chamber 1, integrating sphere 2, shutter 3, camera 4, camera controller 5, shutter control
Device 6 and computer 7.
First turn on integrating sphere 2, each modulating voltage and electric current are set at integrating sphere controller 1, make integrating sphere 2
The uniform source of light of constant illumination is generated at clear aperature.Opening camera 4, camera 4 exposure mode is set to
External synchronization mode 2, starts view data output time and is set to 100ms, output data quantity position after exposure
Number is set to 12, and analog gain is set to 0.Computer 7 sends exposure time series control to camera controller 5
Parameter, controller 5 completes exposure image according to controlling state modulator camera 4 and sends shutter release control
Signal, shutter controller 6 completes the on-off control of shutter 3, computer according to shutter release control signal
7 gather the view data that camera 4 sends.The area array CCD that camera 4 is used has clear electric charge function,
Camera 4 is clear electric charge Function effect when starting to expose, and removes each pixel in area array CCD and believes in exposure
The photogenerated charge that generated before number opening.Being embodied as of the method comprises the steps:
Step one: complete, according to sequencing contro camera shown in Fig. 2, the imaging that double exposes, gate soon in Fig. 2
Shutter opening when signal processed is high level, shutter Guan Bi when shutter control signal is low level；Spectrum assignment
When signal is rising edge, area array CCD starts clear electric charge and exposes, and control signal becomes 100ms after rising edge
Area array CCD starts to export view data.For the first time during imaging, T1=20ms, shutter fully opens,
T2=2ms, camera output image intensity value is Aij；For the second time during imaging, T '1=20ms, T '2=10ms,
Camera output image intensity value is Bij.If the difference of twice imaging correspondence pixel gray value is Cij, i.e.
Cij=Bij-Aij。
Step 2: by CijMiddle data obtain sequence M by sequential arrangement from big to smalli.If the total transparent zone of shutter
The quantity of corresponding pixel is NT, NTCan be byCalculate, whereinFor bracket function, STFor
Shutter total transparent zone area, SPFor area array CCD single pixel area, in the present embodiment, area array CCD
Pixel be the length of side be the square pixel of 9 μm, single pixel area SPIt is 81 μm2；Sequence MiFront NT
Individual data are the gradation data that shutter total transparent zone pixel is corresponding, gMIt is taken as sequence MiFront NTIndividual data
Averaget2-t1=T '2-T2=8ms, utilizesFormula can draw area array CCD
Film speed v of pixel.
Step 3: in shutter closing course, transparent zone area reaches to lose exposure during total transparent zone area p%
Condition, correspondence pixel quantity N in transparent zone when losing conditions of exposureSCan be byCalculate.
Step 4: by AijMiddle data obtain sequence R by descending order arrangementi；When losing conditions of exposure
The N that transparent zone is correspondingSThe gray value of individual pixel is sequence RiFront NSIndividual data, when shutter loses conditions of exposure
Transparent zone correspondence pixel gray value gNIt is taken as
Step 5: correspondence pixel gray value g in transparent zone when shutter just starts to closeBFor the total transparent zone of shutter
The gray value of edge correspondence pixel, gBCan be byRiFormula calculates；UtilizeCan
Obtain shutter and lose the accurate closing time of conditions of exposure from starting to be closed into.By gNIt is taken as shutter and always leads to light
The gray value of district's ad-hoc location correspondence pixel, utilizesFormula can show that shutter is closed into from starting
It is closed to the correct time of ad-hoc location.
Wherein, integrating sphere controller 1 uses the LR40 type controller that Sphere Optics company produces,
Integrating sphere 2 uses the 1 rice diameter integrating sphere that Sphere Optics company produces, shutter 3 be to be detected in
Core type shutter, shutter always leads to light diameter need to be less than 3.5mm, and camera 4 produces M22 for DALSA company
Type camera, this camera uses the FTF4052C type monochrome full frame transition surface array that DALSA company produces
CCD, camera controller 5 is customization camera controller, this camera controller output Transistor-Transistor Logic level face battle array
CCD exposure signal and shutter release control signal, shutter controller 6 is shutter controller to be detected, should
Shutter controller should provide Transistor-Transistor Logic level shutter release control signal interface, and computer 7 is association's industrial computer,
For camera exposure process control and camera image data collection.
Claims (3)
1. a detection method for between-the-lens shutter closing time, the method includes following equipment: light source,
Between-the-lens shutter and area array CCD, be close to between-the-lens shutter to be detected the effective photosensitive area of area array CCD and put
Put, make to combine closely between shutter and area array CCD, without light leak region；Fast homogeneous constant of placing in front of the door shines
Degree light source, it is characterised in that the method comprises the steps:
Step one: during area array CCD exposure for the first time, output image intensity value is Aij, time of exposure is t1；
During second time exposure, output image intensity value is Bij, time of exposure is t2, wherein t2＞ t1If, twice imaging
The difference of corresponding pixel gray value is Cij, i.e. Cij=Bij-Aij；
Step 2: by CijMiddle data obtain sequence M by sequential arrangement from big to smalli；If shutter always leads to light
The quantity of district's correspondence pixel is NT, NTCan be byCalculate, whereinFor bracket function, STFor
Shutter total transparent zone area, SPFor area array CCD single pixel area；Sequence MiFront NTIndividual data are fast
The gradation data that door total transparent zone pixel is corresponding, gMIt is taken as sequence MiFront NTThe average of individual dataUtilizeFormula can draw film speed v of area array CCD pixel；
Step 3: set transparent zone area in shutter closing course and reach to lose exposure during total transparent zone area p%
Optical condition, correspondence pixel quantity N in transparent zone when shutter loses conditions of exposureSCan be byMeter
Calculate；
Step 4: by AijMiddle data obtain sequence R by descending order arrangementi；Shutter loses exposure bar
The N that during part, transparent zone is correspondingSThe gray value of individual pixel is sequence RiFront NSIndividual data, shutter loses exposure
Transparent zone correspondence pixel gray value g during conditionNIt is taken as
Step 5: correspondence pixel gray value g in transparent zone when shutter just starts to closeBFor limit, shutter total transparent zone
The gray value of edge correspondence pixel, gBCan be byFormula calculates；UtilizeCan
Obtain shutter and lose the accurate closing time of conditions of exposure from starting to be closed into.
The detection method of a kind of between-the-lens shutter closing time the most as claimed in claim 1, its feature exists
In, in step 5, by gPIt is taken as the gray value of shutter total transparent zone ad-hoc location correspondence pixel, utilizesFormula can show that shutter is from starting to be closed into the time of ad-hoc location of being closed to.
The detection method of a kind of between-the-lens shutter closing time the most as claimed in claim 1, its feature exists
In, described area array CCD removes the light that each pixel is generated before exposure signal is opened when starting to expose
Raw electric charge.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19934688A1 (en) * | 1998-07-24 | 2000-02-03 | Nec Corp | Electronic shutter for a still frame camera with exposure control |
| CN1811591A (en) * | 2006-03-02 | 2006-08-02 | 西安交通大学 | Medical CCD camera and corresponding X-ray machine exposure controlling method |
| CN101078622A (en) * | 2007-06-21 | 2007-11-28 | 北京凌云光视数字图像技术有限公司 | Aviation total-frame transfer type matrix CCD camera image shift compensation method |
| CN102316275A (en) * | 2011-09-06 | 2012-01-11 | 中国科学院长春光学精密机械与物理研究所 | Exposure time regulating method for non-electronic shutter frame transfer CCD (charge coupled device) |
| CN102508144A (en) * | 2011-10-26 | 2012-06-20 | 西安电子科技大学 | Method for measuring dark signal non-uniformity and photon response non-uniformity of photons of CCD (charge coupled device) chip |
| US20120293708A1 (en) * | 2011-05-17 | 2012-11-22 | Samsung Electronics Co., Ltd. | Digital photographing apparatus and method of controlling the same |
-
2014
- 2014-07-07 CN CN201410320971.4A patent/CN104181805B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19934688A1 (en) * | 1998-07-24 | 2000-02-03 | Nec Corp | Electronic shutter for a still frame camera with exposure control |
| CN1811591A (en) * | 2006-03-02 | 2006-08-02 | 西安交通大学 | Medical CCD camera and corresponding X-ray machine exposure controlling method |
| CN101078622A (en) * | 2007-06-21 | 2007-11-28 | 北京凌云光视数字图像技术有限公司 | Aviation total-frame transfer type matrix CCD camera image shift compensation method |
| US20120293708A1 (en) * | 2011-05-17 | 2012-11-22 | Samsung Electronics Co., Ltd. | Digital photographing apparatus and method of controlling the same |
| CN102316275A (en) * | 2011-09-06 | 2012-01-11 | 中国科学院长春光学精密机械与物理研究所 | Exposure time regulating method for non-electronic shutter frame transfer CCD (charge coupled device) |
| CN102508144A (en) * | 2011-10-26 | 2012-06-20 | 西安电子科技大学 | Method for measuring dark signal non-uniformity and photon response non-uniformity of photons of CCD (charge coupled device) chip |
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| CN104181805A (en) | 2014-12-03 |
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