CN102789113A - Synchronizer for camera - Google Patents
Synchronizer for camera Download PDFInfo
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- CN102789113A CN102789113A CN2012102644470A CN201210264447A CN102789113A CN 102789113 A CN102789113 A CN 102789113A CN 2012102644470 A CN2012102644470 A CN 2012102644470A CN 201210264447 A CN201210264447 A CN 201210264447A CN 102789113 A CN102789113 A CN 102789113A
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- square wave
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Abstract
The invention provides a synchronizer for a camera. The synchronizer comprises a square wave output unit, an exposure synchronizing unit and a stroboscopic synchronizing unit, wherein the square wave output unit is used for generating and outputting a power frequency square wave; the exposure synchronizing unit is connected with the square wave output unit and is used for generating a control sequence signal by using the power frequency square wave outputted by the square wave output unit as a reference source, so as to control an exposure region of the camera and cause the exposure region of the camera to cover at least one partially predefined alternating current high-energy region; and the stroboscopic synchronizing unit is connected with the square wave output unit and is used for generating a stroboscopic pulse signal by using the power frequency square wave outputted by the square wave output unit as the reference source, so as to control a stroboscopic lightening region of a stroboscopic lamp and form an intersected set between the stroboscopic lightening region, the exposure region and the alternating current high-energy region. Compared with the prior art, the synchronizer for the camera has the advantages that the exposure synchronization and the stroboscopic synchronization are simultaneously realized under the conditions of very simple structure and ultralow cost.
Description
Technical field
The present invention relates to technical field of security and protection, relate in particular to a kind of simple in structure and respond well camera synchronization device.
Background technology
Camera is under the low-light (level) environment, and it is very big that its photosensitive-member is understood the noise that can't form images or form images.In fields such as video monitorings,, generally can adopt secondary light source (like the light filling lamp) to illuminate the shooting area of camera in order to obtain the better image quality under the environment low the photograph.Luminous continuation according to the light filling lamp is distinguished, and lasting light filling, stroboscopic light filling is arranged, expose to the sun and dodge three kinds of light fillings.
Fig. 1 is the waveform of three kinds of light filling drive signals, and this paper makes lamp light up as example with high level and describes.Light filling lamp Chang Liang when continuing light filling, but brightness is difficult for regulating; Light filling lamp flicker during the stroboscopic light filling, brightness can be regulated through the dutycycle of regulating the light filling drive signal, and driving signal frequency is when arriving 100 hertz, and human eye is glimmered less than stroboscopic lamp; Expose to the sun dodge light filling then be camera need grabgraf as the time light filling, glimmer as lightning, it is comparatively serious to produce light pollution.
Can find out that through above analysis it is convenient that the stroboscopic light filling has brightness regulation, the advantage that light pollution is few adds that the cost of the type light filling lamp is low, therefore uses more and more widely.But stroboscopic light filling lamp is actual to be the light and shade alternation, and its flicker need could guarantee that the every width of cloth image that photographs all becomes clear synchronously with camera exposure.When using, need to guarantee that the every width of cloth image that photographs all should become clear, therefore, need solve stroboscopic light filling and camera exposure stationary problem when adopting the stroboscopic light filling in fields such as electronic police, intelligent monitorings.The drive signal of stroboscopic light filling lamp (being also referred to as stroboscopic etc.) is normally controlled by camera, as long as camera is controlled drive signal well and just can be guaranteed that stroboscopic and camera exposure are synchronous.
Yet need take in the application scenarioss such as electronic police of traffic-control device at some, because traffic lights by 50Hz power frequency mains-supplied, in fact can cause the frequency scintillation of traffic lights with 100Hz.Camera requires each exposure can both photograph traffic lights when taking traffic lights to become clear, and therefore, it is synchronous that camera is only controlled the time shutter point power frequency that could guarantee to make public well.The stroboscopic light filling is synchronously slightly variant with exposure power frequency synchronization concept: the former is a camera control stroboscopic lamp drive signal, makes itself and camera exposure synchronous; The latter is a camera control time shutter point, makes itself and power frequency civil power synchronous.
Technical at the stroboscopic light filling, the Chinese invention patent application has disclosed a kind of stroboscopic traffic fill light and control method thereof CN201010251494.2 number, and the Chinese invention patent application has disclosed a kind of LED stroboscopic lamp clock-pulse generator for CN02215281.4 number.These prior aries can reduce treatment scheme shown in Figure 2 in its signal Processing.
The processing mode of stroboscopic light filling is from video flowing in the prior art.At first in video flowing, extract field sync signal with signal receiving module; Because field sync signal can embody the exposure synchronizing information fully; Therefore; Signal processing module is stroboscopic pulse as long as the said field sync signal of foundation is derived, and can realize that with light filling lamp driver module driving light filling lamp the stroboscopic light filling is synchronous, and the relation between the signal can be with reference to mistake! Do not find Reference source.Shown in 3.
Further, prior art only realized the stroboscopic light filling synchronously, at intelligent transportation field, limited use, such as, know the occasion (the synchronous occasion of power frequency) of traffic lights information at needs, this scheme must be upgraded.Requiring to have both the synchronous and synchronous situation of stroboscopic light filling of power frequency, prior art need be carried out system upgrade.All modules that comprised exposure power frequency synchronous processing in the system after the upgrading; Also comprise the signal receiving module that is used for the isolation field synchronizing signal simultaneously, the signal processing module of the stroboscopic pulse that is used to derive, be used to drive the light filling lamp driver module of light filling lamp; The signal processing module function of the stroboscopic pulse of wherein deriving comprises generation, phase place adjustment, the dutycycle adjustment of pulse, specifically can be with reference to figure 4.
In addition, on the synchronous camera of the power frequency that realizes making public,, make circuit complicated on the contrary if still adopt existing techniques in realizing stroboscopic light filling synchronous, its be embodied in following some:
At first, need be from photosensitive unit the isolation field synchronizing signal;
Secondly, be used for the stroboscopic pulse of light filling, whenever all will align, please refer to Fig. 3 to field sync signal at a distance from a frame (perhaps counting frame).
At last, need produce pulse train, simultaneously frequency, dutycycle and the phase place of gating pulse sequence according to field sync signal.
This shows, which kind of scheme no matter in the prior art, it is realized at the same time that the synchronous and stroboscopic of power frequency all exists synchronously and realizes complicacy, cost of products problem of higher.
Summary of the invention
In view of this, the present invention provides a kind of camera synchronization device, and this device comprises: square wave output unit, exposure lock unit and stroboscopic lock unit; Wherein:
The square wave output unit is used for generating and output power frequency square wave, wherein the frequency of this power frequency square wave be the civil power ac frequency N doubly, wherein N is a natural number;
Said exposure lock unit; Be connected in said square wave output unit; And be used to use the power frequency square wave of square wave output unit output to generate between the exposure region of control timing signal in the source as a reference with the control camera, make and cover the predefined alternating current high-energy of part district at least between the exposure region of camera;
Said stroboscopic lock unit; Be connected in said square wave output unit; And the power frequency square wave that is used to use the output of square wave output unit generates strobe pulse signal and lights the interval with the stroboscopic of control stroboscopic lamp in the source as a reference, makes said stroboscopic light between interval and said exposure region and there is common factor in alternating current high-energy district.
With respect to prior art; The present invention does not re-use field sync signal, and to control stroboscopic synchronous; But as exposure synchronously and the synchronous common reference source of stroboscopic with the power frequency square wave; With very simple structure and very less cost realized simultaneously exposure synchronously and stroboscopic synchronous, very practical in the supervisory system of field of traffic.
Description of drawings
Fig. 1 is the oscillogram of three kinds of light filling drive signals in the prior art.
Fig. 2 is the signal processing flow figure that existing stroboscopic light filling technology realizes.
Fig. 3 is the graph of a relation of strobe pulse signal and field sync signal in the prior art.
Fig. 4 is the signal processing flow figure of prior art after upgrading on the stroboscopic synchronous foundation.
Fig. 5 is the building-block of logic of a kind of camera synchronization device of the present invention.
Fig. 6 is the synoptic diagram that rectification circuit carries out rectification output.
Fig. 7 is the partial logic structural representation in a kind of compatible design of the present invention.
Fig. 8 is the graphs of a relation of the various signals of the present invention on sequential.
Embodiment
Please refer to Fig. 5, a kind of camera synchronization device provided by the invention comprises square wave output unit, exposure lock unit, stroboscopic lock unit, stroboscopic lamp driver element and photosensitive control unit.Wherein said square wave output unit is used to generate and export corresponding power frequency square wave; Said exposure lock unit; Be connected in said square wave output unit; And be used to use the power frequency square wave of square wave output unit output to generate between the exposure region of control timing signal in the source as a reference with the control camera, make and cover the predefined alternating current high-energy of part district at least between the exposure region of camera; Said stroboscopic lock unit; Be connected in said square wave output unit; And the power frequency square wave that is used to use the output of square wave output unit generates strobe pulse signal and lights the interval with the stroboscopic of control stroboscopic lamp in the source as a reference, makes said stroboscopic light between interval and said exposure region and there is common factor in alternating current high-energy district.In the present invention; Exposure lock unit and stroboscopic lock unit use identical reference source--power frequency square wave; And synchronous process is related with predefined alternating current high-energy district, make that like this light filling of exposure, stroboscopic lamp and traffic lights flicker three are synchronous, and since lock in time the interval overlap the high-energy district of alternating current; Therefore clap in the application scenarios of look traffic lights at needs, have remarkable meaning.In preferred embodiment, each unit can use circuit or logical device to realize.More detailed enforcement introduction below is provided.
Please further with reference to figure 5, said stroboscopic synchronous device also comprises photosensitive control unit and stroboscopic driver element.The exposure lock unit generates control timing and mainly is used for the sense of control light control unit, can realize with reference to prior art the control of photosensitive control unit.And the stroboscopic lock unit can also be realized with reference to prior art the control of stroboscopic driver element.
Please refer to Fig. 6 and Fig. 7.In one embodiment, the square wave output unit can be existing rectification circuit.Rectification circuit is mainly used in according to civil power and generates the power frequency square wave.Civil power is the alternating current of 50HZ normally, and the frequency of power frequency square wave is preferably 100HZ, can certainly be N times (N is a natural number) of 50HZ or 200HZ or any civil power ac frequency.Please refer to the principle of work of Fig. 6 rectification circuit, its cycle according to the power frequency square wave that civil power generates is 10ms.In the present invention, the power frequency square wave will be as the common reference source of stroboscopic lock unit and exposure lock unit.Please further with reference to figure 7; Consider that rectification circuit does not have outside civil power input (possibly be to use direct current supply) in some old design proposals; This moment, rectification circuit can't be exported the power frequency square wave; Therefore the present invention introduces the design of compatibility on the square wave output unit: the square wave output unit can also be selected module and with reference to the square wave generation module except comprising rectification circuit.Select the input of module to be connected respectively in rectification circuit and the output with reference to the square wave generation module; Select module when detecting rectification circuit and have the output of power frequency square wave, with the output of rectification circuit as the output of selecting module, when detecting rectification circuit and not having the output of power frequency square wave, will be with reference to the output of square wave generation module as the output of selecting module.Said is the part of square wave output unit with reference to the square wave generation module, and with generating with reference to square wave, at this power frequency square wave as backup, its frequency is 100HZ in this embodiment with reference to square wave, is equivalent to simulate the power frequency square wave that generates rectification circuit output.Therefore does not limit in the source of the power frequency square wave among the present invention, can be that rectification circuit also can be built-in reference square wave generation module.
Please refer to synchronous with the exposure synchronously concrete realization of stroboscopic in this embodiment shown in Figure 8, suppose that wherein high level is effective.Listed the waveform of each signal among Fig. 8, and dependence each other.The exposure lock unit is used for according to power frequency square wave adjustment exposure control signal (being also referred to as the exposure control timing), and the cycle of exposure control signal is the 1/N of power frequency square wave normally, and wherein N is a natural number.The exposure control signal adjustment process can comprise the generation time of adjusting the exposure control signal rising edge according to preset phase parameter.Usually be to postpone between exposure region in the control signal rising edge; The time of this delay is normally fixing or can join; Therefore the meaning of phase place adjustment is to make and can covers electric signal high-energy district, the predefined city of at least a portion between exposure region; Preferably, the time shutter, the district dropped in the high-energy district fully, and the district comprises by high-energy.
So-called high-energy district is a predefined time domain.How to define this time domain and depend in the practical application quality requirements the camera images acquired; If require low; Then the time range in high-energy district is just relatively broader; If require height then opposite, generally can select the crest of city's electric signal or one section preset time span about trough (energy peak just), such as about each ac period length of 10%.Exposure is actually synchronously the exposure of power frequency in this embodiment synchronous, in case can cover the high-energy district between exposure region.All can photograph the picture of high-energy intra zone traffic lamp when camera makes public at every turn so; If the high-energy area definition is reasonable; The current power supply of traffic lights then can be in the energy peak of civil power so; Correspondingly the brightness meeting of traffic lights is relatively good, and the quality of the traffic lights picture that camera photographs then can be than higher.If image quality is bright excessively, also can suitably depart from electric flux peak, city (being the crest and the trough of civil power).
Please further with reference to figure 8, as previously mentioned, the stroboscopic lock unit uses identical power frequency square wave source as a reference.In preferred embodiment, the stroboscopic lock unit is according to the preset phase parameter and/or the strobe pulse signal of duty cycle parameters generation and output and power frequency square wave same frequency.The use of phase parameter and duty cycle parameters can adopt the means of timer to realize; Such as: timer is done " clear 0 " operation at the rising edge of power frequency square wave; O'clock do " adding 1 " operation at the other times of power frequency square wave with a less step value; Step value can be got the periodic quantity of intercycle fixed clock, and promptly each clock period is done " adding 1 " operation.When timer numerical value reaches the phase place settings, produce rising edge, the purpose of adjustment phase place and/or dutycycle is exactly between the high-energy district and exposure region of total energy alignment civil power when guaranteeing that stroboscopic lamp is lighted at every turn.
In preferred embodiment, the dutycycle of strobe pulse signal is adjustable, and its span need be guaranteed to drive stroboscopic lamp and normally light and guarantee that said stroboscopic is lighted between interval and said exposure region and there is common factor in alternating current high-energy district.The developer can so can occur simultaneously so that between stroboscopic point clear zone and exposure region and high-energy district exists to the adjustment of phase place and dutycycle; In preferred mode, said common factor is between said exposure region.This shows, when making public, be to belong to traffic lights brightness brighter (corresponding said high-energy district) and stroboscopic lamp is in illuminating state (for stroboscopic point clear zone) owing to have portion of time between exposure region at least at every turn.So, can improve camera has an opportunity to obtain stroboscopic lamp when exposure light filling, and reference object is comparatively bright.In preferable mode; Because can relatively hold usually between exposure region, three's common factor can become between exposure region through adjustment fully, the picture quality that photograph this moment will be higher; Clear with reference to the example among the figure 8, dropped on simultaneously between exposure region in high-energy district and the stroboscopic point clear zone.
With respect to prior art; The present invention does not re-use field sync signal, and to control stroboscopic synchronous; But as exposure synchronously and the synchronous common reference source of stroboscopic with the power frequency square wave; With very simple structure and very less cost realized simultaneously exposure synchronously and stroboscopic synchronous, very practical in the supervisory system of field of traffic.
The above is merely preferred embodiment of the present invention, and is in order to restriction the present invention, not all within spirit of the present invention and principle, any modification of being made, is equal to replacement, improvement etc., all should be included within the scope that the present invention protects.
Claims (8)
1. camera synchronization device, this device comprises: square wave output unit, exposure lock unit and stroboscopic lock unit; It is characterized in that:
The square wave output unit is used for generating and output power frequency square wave, wherein the frequency of this power frequency square wave be the civil power ac frequency N doubly, wherein N is a natural number;
Said exposure lock unit; Be connected in said square wave output unit; And be used to use the power frequency square wave of square wave output unit output to generate between the exposure region of control timing signal in the source as a reference with the control camera, make and cover the predefined alternating current high-energy of part district at least between the exposure region of camera;
Said stroboscopic lock unit; Be connected in said square wave output unit; And the power frequency square wave that is used to use the output of square wave output unit generates strobe pulse signal and lights the interval with the stroboscopic of control stroboscopic lamp in the source as a reference, makes said stroboscopic light between interval and said exposure region and there is common factor in alternating current high-energy district.
2. device as claimed in claim 1 is characterized in that, said common factor is between exposure region.
3. device as claimed in claim 1 is characterized in that, said square wave output unit comprises rectification circuit, and said rectification circuit is used for generating the power frequency square wave according to the civil power alternating current.
4. device as claimed in claim 3 is characterized in that, said square wave output unit also comprises: select module and with reference to the square wave generation module; Wherein be used for generating with reference to square wave with reference to the square wave generation module, the output that said selection module is used for when rectification circuit has output, selecting rectification circuit is as the power frequency square wave; And the reference square wave that is used for when rectification circuit is not exported, selecting to generate with reference to the square wave generation module is as the power frequency square wave.
5. device as claimed in claim 1 is characterized in that, the frequency of said civil power alternating current is 50HZ, and the frequency of said power frequency square wave is 100HZ.
6. device as claimed in claim 1 is characterized in that, the power frequency square wave that said stroboscopic lock unit is used to use the output of square wave output unit is the source as a reference, and uses preset phase parameter and/or duty cycle parameters to generate said strobe pulse signal.
7. device as claimed in claim 6; It is characterized in that the span of the dutycycle of said strobe pulse signal is to guarantee to drive stroboscopic lamp normally to light and guarantee that said stroboscopic is lighted between interval and said exposure region and there is the span of common factor in alternating current high-energy district.
8. device as claimed in claim 1 is characterized in that said predefined high-frequency energy district covers the crest or the trough of civil power alternating current.
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| CN201210264447.0A CN102789113B (en) | 2012-07-27 | 2012-07-27 | A kind of synchronizer for camera |
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| CN102801921A (en) * | 2012-08-16 | 2012-11-28 | 浙江宇视科技有限公司 | Bayonet camera |
| CN103442488A (en) * | 2013-08-29 | 2013-12-11 | 南京工程学院 | Energy saving LED fill light |
| CN103442486A (en) * | 2013-08-26 | 2013-12-11 | 南京工程学院 | High-luminance LED strobe lamp |
| CN103491679A (en) * | 2013-09-13 | 2014-01-01 | 南京工程学院 | High-power LED flashlight |
| CN104506779A (en) * | 2014-12-24 | 2015-04-08 | 浙江宇视科技有限公司 | Traffic lamp color correcting method and image pickup equipment |
| US9049333B2 (en) | 2013-05-14 | 2015-06-02 | Pixart Imaging Inc. | Optical detecting device and related method of synchronization adjustment |
| CN105391948A (en) * | 2015-11-05 | 2016-03-09 | 浙江宇视科技有限公司 | Front-end equipment having night-vision fog-penetrating function and control method thereof |
| CN107389535A (en) * | 2017-07-18 | 2017-11-24 | 深圳小孚医疗科技有限公司 | A kind of means of illumination of micro-imaging illuminator |
| CN110493533A (en) * | 2019-05-31 | 2019-11-22 | 杭州海康威视数字技术股份有限公司 | Image collecting device and image-pickup method |
| CN110557576A (en) * | 2019-09-27 | 2019-12-10 | 高新兴科技集团股份有限公司 | Stroboscopic lamp synchronous control method based on video |
| CN110933324A (en) * | 2019-11-27 | 2020-03-27 | 深圳市派科斯科技有限公司 | Stroboscopic light source using method and device and storage medium |
| CN111508243A (en) * | 2020-04-30 | 2020-08-07 | 云南金隆伟业电子有限公司 | Synchronous control receiving method and device for radio stroboscopic signal lamp |
| CN113923356A (en) * | 2021-10-08 | 2022-01-11 | 重庆紫光华山智安科技有限公司 | Synchronization adjustment method and device, electronic equipment and computer readable storage medium |
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Cited By (21)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102801921B (en) * | 2012-08-16 | 2015-05-06 | 浙江宇视科技有限公司 | Bayonet camera |
| CN102801921A (en) * | 2012-08-16 | 2012-11-28 | 浙江宇视科技有限公司 | Bayonet camera |
| US9049333B2 (en) | 2013-05-14 | 2015-06-02 | Pixart Imaging Inc. | Optical detecting device and related method of synchronization adjustment |
| TWI502174B (en) * | 2013-05-14 | 2015-10-01 | Pixart Imaging Inc | Optical detecting devcie and related method of synchronization adjustment |
| CN103442486A (en) * | 2013-08-26 | 2013-12-11 | 南京工程学院 | High-luminance LED strobe lamp |
| CN103442486B (en) * | 2013-08-26 | 2015-06-10 | 南京工程学院 | High-luminance LED strobe lamp |
| CN103442488A (en) * | 2013-08-29 | 2013-12-11 | 南京工程学院 | Energy saving LED fill light |
| CN103491679A (en) * | 2013-09-13 | 2014-01-01 | 南京工程学院 | High-power LED flashlight |
| CN104506779B (en) * | 2014-12-24 | 2018-11-13 | 浙江宇视科技有限公司 | A kind of traffic lights color antidote and picture pick-up device |
| CN104506779A (en) * | 2014-12-24 | 2015-04-08 | 浙江宇视科技有限公司 | Traffic lamp color correcting method and image pickup equipment |
| CN105391948A (en) * | 2015-11-05 | 2016-03-09 | 浙江宇视科技有限公司 | Front-end equipment having night-vision fog-penetrating function and control method thereof |
| CN107389535A (en) * | 2017-07-18 | 2017-11-24 | 深圳小孚医疗科技有限公司 | A kind of means of illumination of micro-imaging illuminator |
| CN110493533A (en) * | 2019-05-31 | 2019-11-22 | 杭州海康威视数字技术股份有限公司 | Image collecting device and image-pickup method |
| CN110493533B (en) * | 2019-05-31 | 2021-09-07 | 杭州海康威视数字技术股份有限公司 | Image acquisition device and image acquisition method |
| CN110557576A (en) * | 2019-09-27 | 2019-12-10 | 高新兴科技集团股份有限公司 | Stroboscopic lamp synchronous control method based on video |
| CN110557576B (en) * | 2019-09-27 | 2021-06-29 | 高新兴科技集团股份有限公司 | Stroboscopic lamp synchronous control method based on video |
| CN110933324A (en) * | 2019-11-27 | 2020-03-27 | 深圳市派科斯科技有限公司 | Stroboscopic light source using method and device and storage medium |
| CN110933324B (en) * | 2019-11-27 | 2021-05-11 | 深圳市派科斯科技有限公司 | Stroboscopic light source using method and device and storage medium |
| CN111508243A (en) * | 2020-04-30 | 2020-08-07 | 云南金隆伟业电子有限公司 | Synchronous control receiving method and device for radio stroboscopic signal lamp |
| CN113923356A (en) * | 2021-10-08 | 2022-01-11 | 重庆紫光华山智安科技有限公司 | Synchronization adjustment method and device, electronic equipment and computer readable storage medium |
| CN113923356B (en) * | 2021-10-08 | 2023-08-29 | 重庆紫光华山智安科技有限公司 | Synchronization adjustment method, synchronization adjustment device, electronic device and computer readable storage medium |
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