CN101296541A - Frequency-flashing light source control device - Google Patents
Frequency-flashing light source control device Download PDFInfo
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- CN101296541A CN101296541A CNA2008100388774A CN200810038877A CN101296541A CN 101296541 A CN101296541 A CN 101296541A CN A2008100388774 A CNA2008100388774 A CN A2008100388774A CN 200810038877 A CN200810038877 A CN 200810038877A CN 101296541 A CN101296541 A CN 101296541A
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Abstract
The invention relates to a light management device in a monitoring system, in particular to a stroboscopic light management device which comprises a synchronous signal unit, a frequency multiplication unit and a trigger control unit, wherein, the frequency multiplication unit receives a standard reference signal sent from the synchronous signal unit and outputs a frequency multiplication signal. When receiving a trigger signal, the trigger control unit outputs a control signal with a given pulse width according to the obtained frequency multiplication signal. By adopting a synchronization technique, the device of the invention ensures stroboscopic lights emitted by a light source and a shutter of a camera to be synchronous, so that all luminous power is exerted during the action period of the shutter of the camera, while during the period of closing the shutter of the camera, no lights is emitted or the lowest brightness is kept. In addition, frequency of a strobe is increased to 100Hz, therefore, no influence is imposed on human eyes, and the illumination intensity of backlighting parts does not need to be considered when the camera shoots backlighting pictures. The light supplementation of the backlighting parts is realized by an impulse LED lamp and the shooting of backlighting objects moving at high speed can be realized.
Description
Technical field
The present invention relates to the light source control device in the supervisory control system, particularly a kind of frequency-flashing light source control device.
Background technology
When existing supervisory control system has the scene of typical backlight characteristic in shooting (for example gateway in building hall), bright excessively in order to solve bias light, and the dim problem of key object has been taked different solutions, but every kind of mode also all exists different problems, typical method for example:
1. adopt the exposure compensating mode, strengthen exposure, but this will cause overall image quality bright excessively;
2. adopt popular super wide dynamic CMOS transducer at present, its essence is different exposures is adopted in different zones, to satisfy the imaging of background and key object simultaneously, this technology can solve the imaging of stationary object preferably, if but key object is in the fast moving state, then image quality is not good;
3. adopt the light filling means, for example photoflash lamp, altar lamp lamp, but for enough illumination is provided, above light source all will cause light pollution to a certain degree, when photoflash lamp is very big to people's stimulation in when flicker, and altar lamp also must adopt very high-power in order to reach enough illumination.
Summary of the invention
The present invention has overcome above-mentioned shortcoming, and a kind of frequency-flashing light source control device reasonable, that shooting effect is good that exposes is provided.
The present invention solves the technical scheme that its technical problem takes: a kind of frequency-flashing light source control device, comprise synchronization signal unit, frequency multiplication unit, trigger control unit, described frequency multiplication unit receives the canonical reference signal from synchronization signal unit, and output frequency-doubled signal, when trigger control unit receives triggering signal, according to the frequency-doubled signal that obtains, with the pulsewidth output control signal of setting.
Described synchronization signal unit can comprise the zero cross detection circuit that is used for gathering the supply frequency signal, be used to gather the field synchronization discrete circuit of the frequency signal of analog video signal, and is used for selecting between zero cross detection circuit and field synchronization split circuit the selection circuit of synchronizing signal.
Described frequency multiplication unit can be adopted as the frequency multiplication of phase locked loop circuit.
Also can comprise parameter set unit, described parameter set unit sends to signalization trigger control unit and selects circuit.
Described trigger control unit can comprise comparison circuit, sends control signal corresponding after the signal of triggering signal and setting is compared.
Described comparison circuit can be the gate array comparison circuit.
The pulsewidth of described trigger control unit output can be 1/18000～10ms.
The present invention adopts simultaneous techniques that the stroboscopic light that light source sends and the shutter of video camera are kept synchronously, during making that camera shutter moves, bring into play whole luminous powers, in the camera shutter down periods, not luminous or only keep minimum brightness, simultaneously the frequency of stroboscopic is brought up to 100Hz, though this moment light source brightness is very big at short notice, therefore but human eye perceives is mean flow rate, and how many differences can't feel has with common light source.By this kind light source, video camera can not need to consider the illumination of backlight part when taking the backlight image, only need to consider background illumination, under the situation of clear shooting background, the light filling of backlight part is realized by pulse LED lamp, do not need means such as exposure compensating, and the shooting that can well solve the backlight object of fast moving.
Description of drawings
Fig. 1 is control principle figure of the present invention.
Embodiment
As shown in Figure 1, comprise the zero cross detection circuit that is used for gathering the supply frequency signal, be used to gather the frequency signal of analog video signal the field synchronization discrete circuit, be used between zero cross detection circuit and field synchronization split circuit, selecting selection circuit, frequency multiplication of phase locked loop circuit, gate array comparison circuit and the parameter set unit of synchronizing signal.
Described zero cross detection circuit provides the 50Hz reference signal of the power supply method of synchronization by the zero cross signal that detects the AC220V AC power; Isolate the 50Hz reference signal of audio video synchronization in the analog video signal of described field synchronization discrete circuit with input, described field synchronization discrete circuit can be realized by the video synchronization signal separating chips.
Described selection circuit is selected reference signal according to parameter set unit, by the 50Hz reference signal of the analog switch out-put supply method of synchronization or the 50Hz reference signal of audio video synchronization.Described frequency multiplication of phase locked loop circuit will select the canonical reference signal of the output of circuit to realize needed 360 frequencys multiplication.
After the signal that described gate array comparison circuit is exported described frequency multiplication of phase locked loop circuit carries out frequency division, according to normality pulsewidth that is provided with and the state of triggering pulsewidth, the positive pulsewidth of control output is the 100Hz square-wave waveform signal of normality pulsewidth under the situation that does not have the triggering signal input, when the triggering signal of burst pulse form was imported, the positive pulsewidth of control output was still exported the 100Hz square-wave waveform signal that positive pulsewidth is the normality pulsewidth afterwards for the one-period 100Hz square-wave waveform that triggers pulsewidth; Described triggering signal can derive from the shutter of video camera, makes described start pulse signal and triggering signal, and it is synchronous promptly to take the time for exposure.
The signal of described gate array comparison circuit output realizes that by the stroboscopic light source driver final LED lamp drives, described stroboscopic light source driver can adopt the common LED lamp drive circuit, with a power MOS pipe as to LED lamp powered switch, the power MOS pipe conducting then powers up on the LED, by then not powering up; Described stroboscopic light source driver also can be the high-brightness LED lamp drive circuit, and by the driving of special high-brightness LED chip for driving realization to LED, its drives switching signal is from the control signal output of stroboscopic light source controller.
Described parameter set unit can be used input equipments such as keyboard, touch-screen, toggle switch, the serial ports by PC send data to array comparison circuit and select circuit, parameters such as the method for synchronization, locking phase and pulse duration are provided with.Which kind of reference signal is the described method of synchronization promptly adopt realize synchronously, according to the difference of actual conditions can select that power supply is synchronous, vision signal synchronously or motor synchronizing, what locking phase then was chosen in synchronizing signal pulse occurs in a certain phase place, realize with video camera synchronously.Pulse duration then can match with aperture time, make amendment, the scope that is provided with of normality (being non-triggering state) pulsewidth is 1/18000～10ms, and frequency is fixing 100Hz, the setting range that triggers pulsewidth is 1/18000～10ms, and frequency is fixing 100Hz.
The present invention adopts simultaneous techniques that the stroboscopic light that light source sends and the shutter of video camera are kept synchronously, during making that camera shutter moves, bring into play whole luminous powers, in the camera shutter down periods, not luminous or only keep minimum brightness, simultaneously the frequency of stroboscopic is brought up to 100Hz, though this moment light source brightness is very big at short notice, therefore but human eye perceives is mean flow rate, and how many differences can't feel has with common light source.By this kind light source, video camera can not need to consider the illumination of backlight part when taking the backlight image, only need to consider background illumination, under the situation of clear shooting background, the light filling of backlight part is realized by pulse LED lamp, do not need means such as exposure compensating, and the shooting that can well solve the backlight object of fast moving.
In addition, when one tunnel synchronizing signal input is only arranged, when need not the synchronizing signal of input selected, described parameter set unit only needs setting signal is mail to described gate array comparison circuit.
More than frequency-flashing light source control device provided by the present invention is described in detail, used specific case herein principle of the present invention and execution mode are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, the part that all can change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (8)
1. frequency-flashing light source control device, it is characterized in that: comprise synchronization signal unit, frequency multiplication unit, trigger control unit, described frequency multiplication unit receives the canonical reference signal from synchronization signal unit, and output frequency-doubled signal, when trigger control unit receives triggering signal, according to the frequency-doubled signal that obtains, with the pulsewidth output control signal of setting.
2. frequency-flashing light source control device according to claim 1, it is characterized in that: described synchronization signal unit comprises the zero cross detection circuit that is used for gathering the supply frequency signal, be used to gather the field synchronization discrete circuit of the frequency signal of analog video signal, and is used for selecting between zero cross detection circuit and field synchronization split circuit the selection circuit of synchronizing signal.
3. frequency-flashing light source control device according to claim 1 is characterized in that: also comprise parameter set unit, described parameter set unit sends to described trigger control unit with signalization.
4. frequency-flashing light source control device according to claim 2 is characterized in that: also comprise parameter set unit, described parameter set unit sends to signalization respectively described trigger control unit and selects circuit.
5. according to each described frequency-flashing light source control device in the claim 1～4, it is characterized in that: described trigger control unit comprises comparison circuit, sends control signal corresponding after the signal of triggering signal and setting is compared.
6. according to each described frequency-flashing light source control device in the claim 1～4, it is characterized in that: described frequency multiplication unit is adopted as the frequency multiplication of phase locked loop circuit.
7. frequency-flashing light source control device according to claim 5 is characterized in that: described comparison circuit is the gate array comparison circuit.
8. according to each described frequency-flashing light source control device in the claim 1～4, it is characterized in that: the pulsewidth of described trigger control unit output is 1/18000～10ms.
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| CN2008100388774A CN101296541B (en) | 2008-06-12 | 2008-06-12 | Frequency-flashing light source control device |
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| CN101808199A (en) * | 2010-03-26 | 2010-08-18 | 上海博康智能网络科技有限公司 | Video acquisition system and acquisition method thereof |
| CN102238325A (en) * | 2010-04-30 | 2011-11-09 | 安鹏科技股份有限公司 | Digital imaging device and related object detection system |
| CN102385219A (en) * | 2011-09-26 | 2012-03-21 | 杭州浙大知能科技有限公司 | Intelligent traffic LED flash lamp and circuit thereof |
| CN102726123A (en) * | 2010-01-15 | 2012-10-10 | 皇家飞利浦电子股份有限公司 | Method and system for 2D detection of localized light contributions |
| CN101604111B (en) * | 2009-06-15 | 2013-01-02 | 张一鸣 | Method and device for anti-reversible-light shooting |
| CN103057569A (en) * | 2013-02-05 | 2013-04-24 | 中南大学 | Track traffic line foreign material invasion limit monitoring device and method |
| CN103442488A (en) * | 2013-08-29 | 2013-12-11 | 南京工程学院 | Energy saving LED fill light |
| CN103841704A (en) * | 2012-11-23 | 2014-06-04 | 海洋王（东莞）照明科技有限公司 | Led lamp control circuit |
| CN104914106A (en) * | 2014-03-11 | 2015-09-16 | 由田新技股份有限公司 | Defect detection method and defect detection device |
| WO2015139519A1 (en) * | 2014-03-20 | 2015-09-24 | 杭州海康威视数字技术股份有限公司 | Complementary metal oxide semiconductor camera and light supplementation method therefor |
| CN109688339A (en) * | 2019-01-21 | 2019-04-26 | 深圳精创视觉科技有限公司 | A kind of programmable LED light source stroboscopic controller |
| CN110087373A (en) * | 2019-05-14 | 2019-08-02 | 广东奥普特科技股份有限公司 | A kind of quick response trigger signal circuit and its control method |
| CN112153274A (en) * | 2019-06-28 | 2020-12-29 | 浙江宇视科技有限公司 | Transmission signal processing method, device, system and storage medium |
| CN113301220A (en) * | 2021-04-27 | 2021-08-24 | 上海欧菲智能车联科技有限公司 | Synchronization method for vehicle-mounted camera and vehicle lamp and FPGA chip |
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| CN2517201Y (en) * | 2002-01-22 | 2002-10-16 | 上海宝康电子控制工程有限公司 | Clock-pulse generator for LED flash light |
| CN2600838Y (en) * | 2003-01-07 | 2004-01-21 | 田果成 | Supplementary light source for camera |
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2008
- 2008-06-12 CN CN2008100388774A patent/CN101296541B/en active Active
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| CN101604111B (en) * | 2009-06-15 | 2013-01-02 | 张一鸣 | Method and device for anti-reversible-light shooting |
| CN102726123A (en) * | 2010-01-15 | 2012-10-10 | 皇家飞利浦电子股份有限公司 | Method and system for 2D detection of localized light contributions |
| CN101808199A (en) * | 2010-03-26 | 2010-08-18 | 上海博康智能网络科技有限公司 | Video acquisition system and acquisition method thereof |
| CN102238325A (en) * | 2010-04-30 | 2011-11-09 | 安鹏科技股份有限公司 | Digital imaging device and related object detection system |
| CN102385219A (en) * | 2011-09-26 | 2012-03-21 | 杭州浙大知能科技有限公司 | Intelligent traffic LED flash lamp and circuit thereof |
| CN102385219B (en) * | 2011-09-26 | 2014-05-07 | 杭州浙大知能科技有限公司 | Intelligent traffic LED flash lamp and circuit thereof |
| CN103841704B (en) * | 2012-11-23 | 2018-07-27 | 海洋王（东莞）照明科技有限公司 | Led lamp control circuit |
| CN103841704A (en) * | 2012-11-23 | 2014-06-04 | 海洋王（东莞）照明科技有限公司 | Led lamp control circuit |
| CN103057569A (en) * | 2013-02-05 | 2013-04-24 | 中南大学 | Track traffic line foreign material invasion limit monitoring device and method |
| CN103057569B (en) * | 2013-02-05 | 2016-03-30 | 中南大学 | A kind of rail line foreign body intrusion monitoring device and method |
| CN103442488A (en) * | 2013-08-29 | 2013-12-11 | 南京工程学院 | Energy saving LED fill light |
| CN104914106A (en) * | 2014-03-11 | 2015-09-16 | 由田新技股份有限公司 | Defect detection method and defect detection device |
| WO2015139519A1 (en) * | 2014-03-20 | 2015-09-24 | 杭州海康威视数字技术股份有限公司 | Complementary metal oxide semiconductor camera and light supplementation method therefor |
| US9648246B2 (en) | 2014-03-20 | 2017-05-09 | Hangzhou Hikvision Digital Technology Co., Ltd. | CMOS video camera and method for filling light |
| CN109688339A (en) * | 2019-01-21 | 2019-04-26 | 深圳精创视觉科技有限公司 | A kind of programmable LED light source stroboscopic controller |
| CN110087373A (en) * | 2019-05-14 | 2019-08-02 | 广东奥普特科技股份有限公司 | A kind of quick response trigger signal circuit and its control method |
| CN110087373B (en) * | 2019-05-14 | 2023-12-08 | 广东奥普特科技股份有限公司 | Quick response trigger signal circuit and control method thereof |
| CN112153274A (en) * | 2019-06-28 | 2020-12-29 | 浙江宇视科技有限公司 | Transmission signal processing method, device, system and storage medium |
| CN112153274B (en) * | 2019-06-28 | 2022-03-15 | 浙江宇视科技有限公司 | Transmission signal processing method, device, system and storage medium |
| CN113301220A (en) * | 2021-04-27 | 2021-08-24 | 上海欧菲智能车联科技有限公司 | Synchronization method for vehicle-mounted camera and vehicle lamp and FPGA chip |
| CN113301220B (en) * | 2021-04-27 | 2024-01-05 | 上海欧菲智能车联科技有限公司 | Synchronization method of vehicle-mounted camera and car lamp and FPGA chip |
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