CN100512383C - Apparatus for expanding dimming scope of CCD TV camera system - Google Patents
Apparatus for expanding dimming scope of CCD TV camera system Download PDFInfo
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- CN100512383C CN100512383C CNB2006101650854A CN200610165085A CN100512383C CN 100512383 C CN100512383 C CN 100512383C CN B2006101650854 A CNB2006101650854 A CN B2006101650854A CN 200610165085 A CN200610165085 A CN 200610165085A CN 100512383 C CN100512383 C CN 100512383C
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- ccd
- light
- light modulation
- limit switch
- iris diaphgram
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Abstract
This invention relates to one device to expend CCD television system adjust range, which comprises variable grating, CCD, visual amplifier, integral, comparer, single machine, electrical control driver, adjust light motor, wherein, the background and aim light are through optical system then through variable grating with images formed onto target surface of CCD; the output visual signals are amplified through the device and integral device with direct level with proportion with surface then through reference voltage, that is the gate value is compared then into single machine; the single machine outputs control signal and through electrical driver to control light adjust motor.
Description
Technical field
The present invention relates to a kind of device of the CCD of expansion television pickup system dimming scope.
Background technology
The CCD television pickup system is the important component part of photoelectric detection equipment, and its effect is that the target of airflight is surveyed, and through optical system imaging, and then through opto-electronic conversion, the target and background image information that detects is exported with vision signal.And ccd video camera is one of topmost part of television system, it has an optimum reception illumination range, when it is aloft scouted and measures, because season, weather, the sun angle of elevation and scene features is different, incident intensity alters a great deal, must carry out light modulation in order to obtain picture rich in detail, make the target picture in the illumination on the video camera target surface in its best range of receiving.At present, existing dimming mode is: as coarse adjustment light, the dimming scope maximum can reach 150 times with filter, and as accurate adjustment light, light modulation multiple maximum can reach 40 with plate of changing density.So, total dimming scope maximum of this CCD television pickup system can reach 150 * 40=6000 doubly, and its dynamic light adjustment scope can not meet the demands.In addition, adopt the combination of filter and plate of changing density to carry out light modulation, can also produce a lot of veiling glares, provide many unfavorable factors for catching real target.
Summary of the invention
Technology of the present invention is dealt with problems: overcome the deficiencies in the prior art, a kind of device of the CCD of expansion television pickup system dimming scope is provided, solve the deficiency and the cancellation veiling glare of existing dimming scope.
Technical solution of the present invention: the device that enlarges CCD television pickup system dimming scope, its characteristics are to comprise: iris diaphgram, CCD, the video amplifier, integrator, comparator, single-chip microcomputer, automatically controlled driver, the light modulation motor, background and target light are passed through optical system, pass through iris diaphgram again, be imaged on the CCD target surface, the vision signal of CCD output is amplified through the video amplifier, output and the proportional DC level of illuminance of ccd fpa behind the integrator integration, again with the light modulation reference voltage, be to deliver to single-chip microcomputer after threshold value compares through comparator, by single-chip microcomputer output control signal, rotate through automatically controlled driver control light modulation motor, light modulation driven by motor iris diaphgram changes the aperture of the diaphragm, thereby changes the CCD illuminance of ccd fpa.In addition, limit switch and light intensity limit switch a little less than minimum and maximum place, iris aperture is provided with light are respectively realized the state-detection to iris diaphgram.
And, be coated with filter coating on the optical glass in the optical system, can further enlarge dimming scope.
The present invention compared with prior art has following advantage: the combination of a kind of electronic shutter that utilizes ccd video camera and optical lens, iris diaphgram is provided, under Single-chip Controlling, realize the method for full-automatic light regulator, not only enlarged dimming scope, and eliminated the veiling glare in the optical system, and method is simple, need not to add mechanical structure, do not increase the camera system weight and volume, the circuit reliability height.
Description of drawings
Fig. 1 is a theory diagram of the present invention.
Embodiment
As shown in Figure 1, iris diaphgram 1, CCD2, the video amplifier 3, integrator 4, comparator 5, single-chip microcomputer 6, automatically controlled driver 7, light modulation motor 8 are formed, limit switch 9 and light intensity limit switch 10 a little less than minimum and maximum place, iris aperture is provided with light are respectively realized the state-detection to iris diaphgram.
Iris diaphgram 1 is the device that is used to control the clear aperature size, changes the illumination that incides on the CCD target surface by changing clear aperature, regulates it and can obtain suitable illumination.When incident intensity alters a great deal, change the requirement that the aperture of the diaphragm can't satisfy dimming scope merely, must change electronic shutter time of integration.For XC-S fourth 30CE video camera, be 1/125-1/10000 the time of integration of its electronic shutter.Following table is the electronic shutter time of integration and control signal relation:
| The time of integration (s) | D 0 | D 1 | D 2 | D 3 |
| 1/125 | 1 | 0 | 0 | 0 |
| 1/250 | 0 | 1 | 0 | 0 |
| 1/500 | 1 | 1 | 0 | 0 |
| 1/1000 | 0 | 0 | 1 | 0 |
| 1/2000 | 1 | 0 | 1 | 0 |
| 1/4000 | 0 | 1 | 1 | 0 |
| 1/10000 | 1 | 1 | 1 | 0 |
The control signal (D of CCD
0～D
3) introduce the cpu controller that single-chip microcomputer constitutes, realized automatic selection CCD electronic shutter time of integration.
Single-chip microcomputer full-automatic light regulator working method:,,, three kinds of situations can occur according to limit switch a little less than the light and light intensity limit switch state if the video level and the light modulation reference voltage of ccd video camera output do not wait at a certain scenery:
(1) when limit switch a little less than the light 9 and light intensity limit switch 10 are in all-pass state (being that signal is a low level), single-chip microcomputer 6 control light modulation motors 8 change the iris aperture, illumination on the CCD2 target surface is adjusted to the light modulation reference voltage equates 8 stop motions of light modulation motor.
(2) limit switch 9 is in off-state (being that signal is a high level) a little less than light, the light intensity limit switch is in the all-pass state, and iris diaphgram 1 is in the maximum diameter of hole, and video voltage and reference voltage are lower, single-chip microcomputer 6 control electronic shutter gear shift increase the time of integration; Single-chip microcomputer 6 is controlled iris diaphgram again and is rotated to the direction that reduces the aperture of the diaphragm, illumination on the CCD2 target surface is adjusted to the light modulation reference voltage equate 8 stop motions of light modulation motor.
(3) limit switch is in all-pass state (being that signal is a low level) a little less than light, the light intensity limit switch is in off-state, and iris diaphgram is in the minimum-value aperture, and video voltage and reference voltage are relatively also high, single-chip microcomputer 6 control electronic shutter gear shift reduce the time of integration; Single-chip microcomputer 6 is controlled iris diaphgram 1 again and is rotated to the direction that increases the aperture of the diaphragm, illumination on the ccd video camera target surface is adjusted to the light modulation reference voltage equate 8 stop motions of light modulation motor.
As can be known from the above table, variable 8 grades of electronic shutter, differ 80 times from 1/125s to 1/10000s the time of integration; The iris diaphgram aperture is from F5～F36, adjustable 50 times; The attenuation multiple of neutral filter coating is 2 times, 8000 times of total dimming scopes.
Claims (2)
1, enlarge the device of CCD television pickup system dimming scope, it is characterized in that comprising: iris diaphgram, CCD, the video amplifier, integrator, comparator, single-chip microcomputer, automatically controlled driver, the light modulation motor, background and target light are passed through optical system, pass through iris diaphgram again, be imaged on the CCD target surface, the vision signal of CCD output is amplified through the video amplifier, output and the proportional DC level of illuminance of ccd fpa behind the integrator integration, again with the light modulation reference voltage, be to deliver to single-chip microcomputer after threshold value compares through comparator, by single-chip microcomputer output control signal, rotate through automatically controlled driver control light modulation motor, light modulation driven by motor iris diaphgram changes the aperture of the diaphragm, thereby changes the CCD illuminance of ccd fpa; Limit switch and light intensity limit switch a little less than minimum and maximum place, described iris aperture is provided with light are respectively realized the state-detection to iris diaphgram; The process of described Single-chip Controlling light modulation is:
(1) limit switch and light intensity limit switch are in the all-pass state a little less than light, be that signal is when being low level, Single-chip Controlling light modulation motor changes the iris aperture, illumination on the ccd video camera target surface is adjusted to the light modulation reference voltage equate the stop motion of light modulation motor;
(2) limit switch is in off-state a little less than light, be that signal is a high level, the light intensity limit switch is in the all-pass state, iris diaphgram is in the maximum diameter of hole, and video voltage and reference voltage are lower, the gear shift of Single-chip Controlling electronic shutter, increase the time of integration, single-chip microcomputer is controlled iris diaphgram again and is rotated to the direction that reduces the aperture of the diaphragm, illumination on the ccd video camera target surface is adjusted to the light modulation reference voltage equate the stop motion of light modulation motor;
(3) limit switch is in the all-pass state a little less than light, and promptly signal is a low level, and the light intensity limit switch is in off-state, and iris diaphgram is in the minimum-value aperture, and video voltage and reference voltage are relatively also high, and the gear shift of Single-chip Controlling electronic shutter reduces the time of integration; Single-chip microcomputer is controlled iris diaphgram again and is rotated to the direction that increases the aperture of the diaphragm, illumination on the ccd video camera target surface is adjusted to the light modulation reference voltage equate the stop motion of light modulation motor.
2, the device of expansion CCD television pickup system dimming scope according to claim 1 is characterized in that: be coated with filter coating on the optical glass in the optical system before iris diaphgram, can further enlarge dimming scope.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006101650854A CN100512383C (en) | 2006-12-13 | 2006-12-13 | Apparatus for expanding dimming scope of CCD TV camera system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006101650854A CN100512383C (en) | 2006-12-13 | 2006-12-13 | Apparatus for expanding dimming scope of CCD TV camera system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1972382A CN1972382A (en) | 2007-05-30 |
| CN100512383C true CN100512383C (en) | 2009-07-08 |
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ID=38112940
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2006101650854A Expired - Fee Related CN100512383C (en) | 2006-12-13 | 2006-12-13 | Apparatus for expanding dimming scope of CCD TV camera system |
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| Country | Link |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102269913A (en) * | 2010-06-07 | 2011-12-07 | 鸿富锦精密工业（深圳）有限公司 | Aperture control system |
| CN110958371A (en) * | 2019-12-17 | 2020-04-03 | 孝感华中精密仪器有限公司 | Automatic dimming television camera suitable for ultra-wide illumination range |
| CN113533958A (en) * | 2021-06-17 | 2021-10-22 | 西安北方光电科技防务有限公司 | Density disc diaphragm time detector and detection method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4525037A (en) * | 1982-07-09 | 1985-06-25 | Minolta Camera Kabushiki Kaisha | Objective lens assembly of variable focal length having a diaphragm mechanism with adjustable aperture |
| CN1159602A (en) * | 1995-03-03 | 1997-09-17 | 三星电子株式会社 | Automatic diaphragm device |
| CN2339999Y (en) * | 1997-12-19 | 1999-09-22 | 景通科技股份有限公司 | Device for regulating illumination intensity distribution of imaging apparatus |
-
2006
- 2006-12-13 CN CNB2006101650854A patent/CN100512383C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4525037A (en) * | 1982-07-09 | 1985-06-25 | Minolta Camera Kabushiki Kaisha | Objective lens assembly of variable focal length having a diaphragm mechanism with adjustable aperture |
| CN1159602A (en) * | 1995-03-03 | 1997-09-17 | 三星电子株式会社 | Automatic diaphragm device |
| CN2339999Y (en) * | 1997-12-19 | 1999-09-22 | 景通科技股份有限公司 | Device for regulating illumination intensity distribution of imaging apparatus |
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| CN1972382A (en) | 2007-05-30 |
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