CN100370354C - Automatic focusing control circuit for eliminating exposure flicker under lighting lamp - Google Patents
Automatic focusing control circuit for eliminating exposure flicker under lighting lamp Download PDFInfo
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- CN100370354C CN100370354C CNB2003101168251A CN200310116825A CN100370354C CN 100370354 C CN100370354 C CN 100370354C CN B2003101168251 A CNB2003101168251 A CN B2003101168251A CN 200310116825 A CN200310116825 A CN 200310116825A CN 100370354 C CN100370354 C CN 100370354C
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Abstract
The present invention discloses an automatic focusing control circuit for eliminating exposure flickers under a lighting lamp, which belongs to the field of exposure regulation under a fluorescent lamp. The present invention can eliminate abrupt brightness change in an exposure regulation process and can solve the problem that brightness gain and exposure time cannot be simultaneously effective. A brightness gain control circuit of the present invention also comprises a synchronous control unit which is provided with a preset brightness gain validation delay frame number; a regulation mode control unit sends a control instruction to the synchronous control unit. An exposure time control circuit also comprises a validation mark counting unit which counts an exposure frame number of an exposure time validation unit and sends the exposure frame number obtained through counting to the synchronous control unit; the synchronous control unit compares the exposure frame number sent by the validation mark counting unit and the preset brightness gain validation delay frame number; if the delay frame number is reached, the synchronous control element sends a brightness validation control instruction to a brightness gain validation unit.
Description
Technical field
The present invention relates to the field that exposure is regulated under the daylight lamp, relate in particular to the automatic exposure control circuit of eliminating explosure flash under the illuminating lamp.
Background technology
Usually under fluorescent light,, must allow the exposure of sensor be 1/100 second integral multiple during PAL-system, must allow the exposure of sensor be 1/120 second integral multiple during TSC-system in order to eliminate the flicker striped that sensor photosensitive produces.Smoother in order to allow exposure regulate simultaneously, when AE regulates, between two time shutter shelves,, make AE regulate and seem smoother with the method for regulating luminance gain.When regulating the time shutter, when the time shutter changed, luminance gain also was returned to the basic point yield value of adjusting.So just produced a problem, after the time shutter was changed, sensor can't allow the time shutter after changing just come into force at once at present frame, just can come into force but will delay several frames, and the luminance gain value can come into force at once.The problem that brightness has a sudden change flicker in the process that AE regulates, occurs with regard to having caused like this, make AE regulate and seem unsmooth.
Summary of the invention
In order to solve prior art problems and deficiency, the object of the present invention is to provide a kind of automatic exposure control circuit of eliminating explosure flash under the illuminating lamp.It can eliminate the jump in brightness in the exposure mediation process, has solved the problem that luminance gain and time shutter come into force simultaneously.
In order to realize the foregoing invention purpose, technical scheme of the present invention realizes as follows:
A kind of automatic exposure control circuit of eliminating explosure flash under the illuminating lamp comprises the luminance gain control circuit that receives luminance gain and upgrade, the exposure time control circuit that receives the time shutter renewal.Described exposure time control circuit comprises the time shutter unit that comes into force, and the unit sending controling instruction that comes into force of described time shutter is given described external sensor.The described luminance gain of giving comprise described luminance gain control circuit adjusting pattern control module and the luminance gain unit that comes into force, the described adjusting pattern control module sending controling instruction unit that comes into force.Its design feature is, described luminance gain control circuit comprises that also setting in advance luminance gain comes into force and postpone the synchronous control unit of frame number, and described adjusting pattern control module sending controling instruction is given described synchronous control unit.Described exposure time control circuit also comprises the Blip Counting unit that comes into force, the described Blip Counting unit that comes into force is to the come into force exposure frames counting number of unit and the frame number that counts to get sent to described synchronous control unit of time shutter, described synchronous control unit is compared according to come into force Blip Counting unit exposure frame number that sends and the luminance gain that the presets delay frame number that comes into force, if reach the delay frame number, described synchronous control unit sends steering order that brightness comes into force to the described luminance gain unit that comes into force.
The luminance gain that above-mentioned synchronous control unit sets in advance comes into force and postpones frame number and can regulate.The luminance gain that sets in advance comes into force, and to postpone frame number be 1.
The frame number that obtains exposure image is counted by the frame start information to exposure image in the above-mentioned Blip Counting unit that comes into force.
After regulating the time shutter, sensor can't allow the time shutter come into force at once at present frame, just comes into force but delay youngster's frame.The Blip Counting unit that comes into force of the present invention is counted the number of image frames of exposure, and send the frame number count to get to synchronous control unit by the Blip Counting unit that comes into force, synchronous control unit comes into force frame number that obtains and the luminance gain that sets in advance and postpones frame number and compare, and comes into force and makes luminance gain come into force when postponing frame number when the number of image frames of exposure reaches luminance gain.Like this, just solved the problem that time shutter and luminance gain come into force simultaneously, eliminated the jump in brightness flicker in the AE mediation process, made AE regulate and become level and smooth.
Description of drawings
Fig. 1 is construction module figure of the present invention;
Fig. 2 is for realizing method flow diagram of the present invention.
The present invention is described in detail at the drawings and specific embodiments below.
Embodiment
Referring to Fig. 1, the present invention includes the luminance gain control circuit 1 that receives luminance gain and upgrade, the exposure time control circuit 2 that receives the time shutter renewal.Described exposure time control circuit 2 comprises come into force Blip Counting unit 6 and the time shutter unit 7 that comes into force.The described time shutter is come into force the unit sending controling instruction to the described external sensor 8 and the Blip Counting unit 6 that comes into force.The described Blip Counting unit 6 pairs of time shutter of coming into force come into force the unit the exposure frames counting number and send to described luminance gain refresh circuit 1.Comprise described luminance gain control circuit 1 adjusting pattern control module 3, synchronous control unit 4 and the luminance gain unit 5 that comes into force.The luminance gain that set in advance described synchronous control unit 4 comes into force and postpones frame number (being set to 1 usually), and this luminance gain comes into force and postpones frame number and can regulate.Give described adjusting pattern control module 3 sending controling instructions described synchronous control unit 4 and the luminance gain unit 5 that comes into force.Described synchronous control unit 4 is compared according to Blip Counting unit 6 exposure frame number that sends and the luminance gains that preset that the come into force delay frame number that comes into force.If reach the delay frame number, described synchronous control unit 4 sends steering order that brightness come into force to the described luminance gain unit 5 that comes into force.
Referring to Fig. 2, the workflow of this device is: 1) the luminance gain value is set; 2) be set the time shutter; 3) judge whether to be provided with luminance gain, if be not provided with, then return AE circulation next time, if be provided with, then execution in step 4); 4) zone bit that comes into force of exposure image is counted, obtained the frame number of exposure image; 5) number of image frames that obtains and the luminance gain that has set in advance are come into force postpone frame number and compare, if reach the delay frame number, then execution in step 6), if do not reach the delay frame number, then return step 4); 6) luminance gain comes into force; 7) carry out AE circulation next time.
If illuminating lamp is the light source of 50Hz alternating current under driving, above-mentioned steps 2) in time shutter be 0.01 second integral multiple; If illuminating lamp is under the light source of 60Hz alternating current under driving, above-mentioned steps 2) time shutter in is 1/120 second a integral multiple.
When carrying out the AE adjusting, calculate the average brightness value of whole two field picture earlier, judging whether needs conciliation brightness and time shutter.Carry out the adjustment of brightness and time shutter by three kinds of modes then, first kind of mode is under the stable situation of time shutter, only need adjust luminance gain; The second way is only to need to adjust the time shutter, and the explosure flash of generation is very slight; The third mode is to adjust simultaneously luminance gain and time shutter, and it is smoother to make that by the method for reconciling luminance gain AE regulates.The present invention is exactly the improvement at the third mode, comes into force simultaneously by regulating luminance gain and time shutter, and it is more level and smooth to make that AE regulates.
Claims (4)
1. automatic exposure control circuit of eliminating explosure flash under the illuminating lamp, comprise the luminance gain control circuit (1) that receives luminance gain and upgrade, the exposure time control circuit (2) that receives the time shutter renewal, described exposure time control circuit (2) comprises the time shutter unit (7) that comes into force, and unit (7) sending controling instruction that comes into force of described time shutter is given external sensor (8); The described luminance gain of giving comprise described luminance gain control circuit (1) adjusting pattern control module (3) and the luminance gain unit (5) that comes into force, described adjusting pattern control module (3) the sending controling instruction unit (5) that comes into force; It is characterized in that, described luminance gain control circuit (1) comprises that also setting in advance luminance gain comes into force and postpone the synchronous control unit (4) of frame number, described adjusting pattern control module (3) sending controling instruction is given described synchronous control unit (4), described exposure time control circuit (2) also comprises the Blip Counting unit (6) that comes into force, the described Blip Counting unit (6) that comes into force is to the come into force exposure frames counting number of unit (7) and the frame number that counts to get sent to described synchronous control unit (4) of time shutter, described synchronous control unit (4) is compared according to the Blip Counting unit (6) that comes into force exposure frame number that sends and the luminance gain that the presets delay frame number that comes into force, if reach the delay frame number, described synchronous control unit (4) sends steering order that brightness comes into force to the described luminance gain unit (5) that comes into force.
2. according to the automatic exposure control circuit of explosure flash under the described elimination illuminating lamp of claim 1, it is characterized in that the luminance gain that described synchronous control unit (4) sets in advance comes into force and postpones frame number and can regulate.
3. according to the automatic exposure control circuit of explosure flash under the described elimination illuminating lamp of claim 1, it is characterized in that the described luminance gain that sets in advance comes into force, and to postpone frame number be 1.
4. according to the automatic exposure control circuit of explosure flash under the described elimination illuminating lamp of claim 1, it is characterized in that the frame number that obtains exposure image is counted by the frame start information to exposure image in the described Blip Counting unit (6) that comes into force.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2003101168251A CN100370354C (en) | 2003-11-28 | 2003-11-28 | Automatic focusing control circuit for eliminating exposure flicker under lighting lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2003101168251A CN100370354C (en) | 2003-11-28 | 2003-11-28 | Automatic focusing control circuit for eliminating exposure flicker under lighting lamp |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1547073A CN1547073A (en) | 2004-11-17 |
| CN100370354C true CN100370354C (en) | 2008-02-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2003101168251A Expired - Lifetime CN100370354C (en) | 2003-11-28 | 2003-11-28 | Automatic focusing control circuit for eliminating exposure flicker under lighting lamp |
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| CN (1) | CN100370354C (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100337471C (en) * | 2005-10-21 | 2007-09-12 | 北京中星微电子有限公司 | Simple judgement of flashing under line exposure mode and eliminating method thereof |
| JP4936534B2 (en) * | 2007-06-11 | 2012-05-23 | キヤノン株式会社 | Imaging apparatus and focus control method |
| WO2020181494A1 (en) * | 2019-03-12 | 2020-09-17 | 深圳市大疆创新科技有限公司 | Parameter synchronization method, image capture apparatus, and movable platform |
| CN112532888B (en) * | 2019-09-19 | 2022-10-04 | 杭州海康慧影科技有限公司 | Method and device for inhibiting image striation phenomenon |
| CN113784056B (en) * | 2020-06-10 | 2023-03-24 | 杭州海康威视数字技术股份有限公司 | Exposure control method and exposure control device |
| CN112954305B (en) * | 2021-01-27 | 2022-08-09 | 浙江智慧视频安防创新中心有限公司 | Shooting parameter testing method and device for industrial camera and storage medium |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05122599A (en) * | 1991-09-04 | 1993-05-18 | Fuji Photo Film Co Ltd | Exposure controller for video camera |
| US5258848A (en) * | 1991-02-28 | 1993-11-02 | Sony Corporation | Exposure controller of a video camera |
| US5610654A (en) * | 1994-04-19 | 1997-03-11 | Eastman Kodak Company | Automatic camera exposure control using variable exposure index CCD sensor |
| JPH10210347A (en) * | 1997-01-20 | 1998-08-07 | Nippon Samusun Kk | Ae control signal processor |
| CN1396488A (en) * | 2001-07-09 | 2003-02-12 | 富士胶片株式会社 | Camera device with flasher |
| CN2694317Y (en) * | 2003-11-28 | 2005-04-20 | 北京中星微电子有限公司 | Automatic exposure control circuit for avoiding exposure twinkle under lighting lamp |
-
2003
- 2003-11-28 CN CNB2003101168251A patent/CN100370354C/en not_active Expired - Lifetime
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5258848A (en) * | 1991-02-28 | 1993-11-02 | Sony Corporation | Exposure controller of a video camera |
| JPH05122599A (en) * | 1991-09-04 | 1993-05-18 | Fuji Photo Film Co Ltd | Exposure controller for video camera |
| US5610654A (en) * | 1994-04-19 | 1997-03-11 | Eastman Kodak Company | Automatic camera exposure control using variable exposure index CCD sensor |
| JPH10210347A (en) * | 1997-01-20 | 1998-08-07 | Nippon Samusun Kk | Ae control signal processor |
| CN1396488A (en) * | 2001-07-09 | 2003-02-12 | 富士胶片株式会社 | Camera device with flasher |
| CN2694317Y (en) * | 2003-11-28 | 2005-04-20 | 北京中星微电子有限公司 | Automatic exposure control circuit for avoiding exposure twinkle under lighting lamp |
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| CN1547073A (en) | 2004-11-17 |
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Address after: 519031 -23898, 105 room 6, Baohua Road, Hengqin New District, Zhuhai, Guangdong (centralized office area) Patentee after: Zhongxing Technology Co.,Ltd. Address before: 519031 -23898, 105 room 6, Baohua Road, Hengqin New District, Zhuhai, Guangdong (centralized office area) Patentee before: Zhongxing Technology Co.,Ltd. |
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