CN102789113B - A kind of synchronizer for camera - Google Patents
A kind of synchronizer for camera Download PDFInfo
- Publication number
- CN102789113B CN102789113B CN201210264447.0A CN201210264447A CN102789113B CN 102789113 B CN102789113 B CN 102789113B CN 201210264447 A CN201210264447 A CN 201210264447A CN 102789113 B CN102789113 B CN 102789113B
- Authority
- CN
- China
- Prior art keywords
- square wave
- stroboscopic
- output unit
- power frequency
- wave output
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Stroboscope Apparatuses (AREA)
Abstract
The invention provides a kind of synchronizer for camera, this device comprises: square wave output unit, for generating and exporting power frequency square wave; Exposure sync unit, be connected to described square wave output unit, and for the power frequency square wave that uses square wave output unit to export as generating Control timing sequence signal with reference to source with between the exposure region controlling camera, make between the exposure region of camera, to cover at least part of predefined alternating current high-energy district; Stroboscopic lock unit is connected to described square wave output unit, and light interval as generating strobe pulse signal with reference to source with the stroboscopic controlling stroboscopic lamp for the power frequency square wave that uses square wave output unit to export, make described stroboscopic light between interval and described exposure region and alternating current high-energy district exists and occurs simultaneously.Relative to prior art, the present invention can with very simple structure and very cheap cost achieves exposure sync simultaneously and stroboscopic is synchronous.
Description
Technical field
The present invention relates to technical field of security and protection, particularly relate to the synchronizer for camera that a kind of structure is simple and respond well.
Background technology
Camera under low-light (level) environment, its photosensitive-member can cannot imaging or imaging noise very large.In fields such as video monitorings, in order to obtain good picture quality low according under environment, secondary light source (as light compensating lamp) generally can be adopted to illuminate the shooting area of camera.Distinguish according to the luminous continuation of light compensating lamp, have lasting light filling, stroboscopic light filling, expose to the sun and dodge light filling three kinds.
Fig. 1 is the waveform of three kinds of light filling drive singal, makes lamp light up as example be herein described with high level.Light compensating lamp Chang Liang during lasting light filling, but brightness not easily regulates; Light compensating lamp flicker during stroboscopic light filling, brightness can be regulated by the dutycycle of adjustment light filling drive singal, and when driving signal frequency arrives 100 hertz, and human eye is discovered and glimmered less than stroboscopic lamp; Expose to the sun dodge light filling be then camera need grabgraf as time just light filling, glimmer as lightning, produce light pollution comparatively serious.
Can be found out by above analysis, it is convenient that stroboscopic light filling has brightness regulation, and the advantage that light pollution is few, adds that the cost of the type light compensating lamp is low, therefore apply more and more extensive.But stroboscopic light filling lamp is actual is light and shade alternation, every width image that its flicker needs guarantee synchronous with camera exposure to photograph is all bright.When applying in the field such as electronic police, intelligent monitoring, need to ensure that the every width image photographed should be all bright, therefore, adopt during stroboscopic light filling and need to solve stroboscopic light filling and camera exposure stationary problem.The drive singal of stroboscopic light filling lamp (also referred to as stroboscopic etc.) is normally controlled by camera, as long as camera is controlled drive singal well and just can be ensured that stroboscopic is synchronous with camera exposure.
But need at some, in the application scenarioss such as the electronic police of shooting traffic-control device, because traffic lights are by 50Hz power frequency mains-supplied, traffic lights in fact can be caused with the frequency scintillation of 100Hz.It is bright for requiring during camera shooting traffic lights that each exposure can photograph traffic lights, and therefore, it is synchronous that exposure time point guarantee exposure power frequency only controlled well by camera.Stroboscopic light filling is synchronous and expose power frequency synchronization concept slightly difference: the former is camera control stroboscopic lamp drive singal, makes it synchronous with camera exposure; The latter is camera control exposure time point, makes it synchronous with power frequency civil power.
Technical at stroboscopic light filling, No. CN201010251494.2nd, Chinese invention patent application discloses a kind of stroboscopic traffic fill light and control method thereof, and No. CN02215281.4th, Chinese invention patent application discloses a kind of LED stroboscopic lamp clock-pulse generator.These prior aries can be summarized as the treatment scheme shown in Fig. 2 at its signal transacting.
In prior art, the processing mode of stroboscopic light filling is from video flowing.First from video flowing, field sync signal is extracted with signal receiving module, because field sync signal can embody exposure sync information completely, therefore, as long as signal processing module derives stroboscopic pulse according to described field sync signal, the relation between signal could with reference to mistake and it is synchronous to drive light compensating lamp can realize stroboscopic light filling with light compensating lamp driver module! Do not find Reference source.Shown in 3.
Furthermore, prior art only achieves the synchronous of stroboscopic light filling, at intelligent transportation field, applies limited, and such as, needing the occasion (the synchronous occasion of power frequency) knowing traffic lights information, the program must be upgraded.Requiring to have both synchronous synchronous with the stroboscopic light filling situation of power frequency, prior art needs to carry out system upgrade.All modules that exposure power frequency synchronously processes are included in system after upgrading, also comprise simultaneously the signal receiving module for separating of field sync signal, the signal processing module for derivative stroboscopic pulse, for driving the light compensating lamp driver module of light compensating lamp, the signal processing module function wherein deriving stroboscopic pulse comprises the generation of pulse, phase place adjustment, dutycycle adjustment, specifically can reference diagram 4.
In addition, realizing exposing on the synchronous camera of power frequency, if still adopt existing techniques in realizing stroboscopic light filling synchronous, making circuit complicated on the contrary, its be embodied in following some:
First, isolation field synchronizing signal from photosensitive unit is needed;
Secondly, for the stroboscopic pulse of light filling, all to align to field sync signal every a frame (or number frame), please refer to Fig. 3.
Finally, need to produce pulse train according to field sync signal, simultaneously the frequency of gating pulse sequence, dutycycle and phase place.
As can be seen here, no matter which kind of scheme in prior art, its realize at the same time the synchronous and stroboscopic of power frequency synchronous on all exists and realizes complexity, the problem that cost of products is higher.
Summary of the invention
In view of this, the invention provides a kind of synchronizer for camera, this device comprises: square wave output unit, exposure sync unit and stroboscopic lock unit; Wherein:
Square wave output unit, for generating and exporting power frequency square wave, wherein this power frequency side's wave frequency is N times of mains electricity frequency, and wherein N is natural number;
Described exposure sync unit, be connected to described square wave output unit, and for the power frequency square wave that uses square wave output unit to export as generating Control timing sequence signal with reference to source with between the exposure region controlling camera, make between the exposure region of camera, to cover at least part of predefined alternating current high-energy district;
Described stroboscopic lock unit, be connected to described square wave output unit, and light interval as generating strobe pulse signal with reference to source with the stroboscopic controlling stroboscopic lamp for the power frequency square wave that uses square wave output unit to export, make described stroboscopic light between interval and described exposure region and alternating current high-energy district exists and occurs simultaneously.
Relative to prior art, it is synchronous to control stroboscopic that the present invention does not re-use field sync signal, but using power frequency square wave as exposure sync and the synchronous collective reference source of stroboscopic, achieve exposure sync and stroboscopic is synchronous with very simple structure and very cheap cost simultaneously, very practical in the supervisory system of field of traffic.
Accompanying drawing explanation
Fig. 1 is the oscillogram of three kinds of light filling drive singal in 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 prior art.
Fig. 4 is the signal processing flow figure after prior art is upgraded on stroboscopic synchronous foundation.
Fig. 5 is the building-block of logic of a kind of synchronizer for camera of the present invention.
Fig. 6 is the schematic 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 graph of a relation of the various signal of the present invention in sequential.
Embodiment
Please refer to Fig. 5, a kind of synchronizer for camera provided by the invention comprises square wave output unit, exposure sync unit, stroboscopic lock unit, stroboscopic lamp driver element and photosensitive control module.Wherein said square wave output unit is for generating and exporting corresponding power frequency square wave; Described exposure sync unit, be connected to described square wave output unit, and for the power frequency square wave that uses square wave output unit to export as generating Control timing sequence signal with reference to source with between the exposure region controlling camera, make between the exposure region of camera, to cover at least part of predefined alternating current high-energy district; Described stroboscopic lock unit, be connected to described square wave output unit, and light interval as generating strobe pulse signal with reference to source with the stroboscopic controlling stroboscopic lamp for the power frequency square wave that uses square wave output unit to export, make described stroboscopic light between interval and described exposure region and alternating current high-energy district exists and occurs simultaneously.In the present invention, exposure sync unit and stroboscopic lock unit use identical reference source--power frequency square wave, and synchronous process is associated with predefined alternating current high-energy district, make like this to expose, the light filling of stroboscopic lamp and traffic lights flicker three synchronous, and because interval lock in time overlaps the high-energy district of alternating current, therefore needing to clap in the application scenarios of look traffic lights, tool significance.In a preferred embodiment, unit can use circuit or logical device to realize.More detailed enforcement introduction is below provided.
Please further refer to Fig. 5, described stroboscopic synchronous device also comprises photosensitive control module and stroboscopic driver element.Exposure sync unit generates Control timing sequence and is mainly used to Perceived control light control unit, can realize the control of photosensitive control module with reference to prior art.And stroboscopic lock unit can also realize with reference to prior art the control of stroboscopic driver element.
Please refer to Fig. 6 and Fig. 7.In one embodiment, square wave output unit can be existing rectification circuit.Rectification circuit is mainly used in generating power frequency square wave according to civil power.The alternating current of civil power normally 50HZ, power frequency side's wave frequency is preferably 100HZ, can certainly be 50HZ or 200HZ or arbitrarily mains electricity frequency N doubly (N is natural number).Please refer to the principle of work of Fig. 6 rectification circuit, its power frequency side generated according to civil power is 10ms wave period.In the present invention, power frequency square wave is using the collective reference source as stroboscopic lock unit and exposure sync unit.Please further refer to Fig. 7, consider that in some old design proposals, rectification circuit does not have outside civil power input (may be with direct current supply), now rectification circuit cannot export power frequency square wave, therefore the present invention introduces compatible design on square wave output unit: square wave output unit, except comprising rectification circuit, can also select module and reference square wave generation module.The input of module is selected to be connected respectively in rectification circuit and the output with reference to square wave generation module; Select module detect rectification circuit exist power frequency square wave export time, using the output of rectification circuit as selecting the output of module, detect rectification circuit do not exist power frequency square wave export time, with reference to the output of square wave generation module as the output selecting module.Described is the part of square wave output unit with reference to square wave generation module, is used for generating reference square wave, and with reference to the power frequency square wave of square wave in this as backup, its frequency is 100HZ in the present embodiment, is equivalent to simulate the power frequency square wave generating rectification circuit and export.The source of the power frequency square wave therefore in the present invention is not limited to, and can be rectification circuit also can be built-in reference square wave generation module.
Please refer to the synchronous specific implementation with exposure sync of stroboscopic in the present embodiment shown in Fig. 8, wherein hypothesis high level is effective.The waveform of each signal is listed in Fig. 8, and dependence each other.Exposure sync unit is used for according to power frequency square wave adjustment exposure control signal (also referred to as spectrum assignment sequential), and the 1/N of cycle of exposure control signal normally power frequency square wave, wherein N is natural number.Exposure control signal adjustment process can comprise according to the phase parameter preset to adjust the generation time of exposure control signal rising edge.Postpone in control signal rising edge between usual exposure region, this normally fixing time postponed or can join, therefore the meaning of phase place adjustment is to make can cover between exposure region electric signal high-energy district of predefined city at least partially, preferably, time shutter, district dropped in high-energy district completely, comprise by high-energy district.
So-called high-energy district is a predefined time domain.How to define this time domain and depend on quality requirements to collected by camera image in practical application, if require low, then the time range in high-energy district is just broader, if require height, contrary, the time span that one section about the crest of city's electric signal or trough (namely energy peak) is default can be selected under normal circumstances, such as the ac period length of left and right each 10%.Exposure sync is actually the exposure sync of power frequency in the present embodiment, once can cover high-energy district between exposure region.The picture of high-energy intra zone traffic lamp all can be photographed when so camera exposes at every turn, if high-energy area definition is reasonable, so the current power supply of traffic lights then can be in the high peak energy of civil power, correspondingly the brightness of traffic lights can be relatively good, and the quality of the traffic lights picture that camera photographs then can be higher.If image quality is excessively bright, civil power high peak energy (i.e. the crest of civil power and trough) also suitably can be departed from.
Please further refer to Fig. 8, as previously mentioned, stroboscopic lock unit uses identical power frequency square wave as reference source.In a preferred embodiment, stroboscopic lock unit generates according to the phase parameter preset and/or duty cycle parameters and exports the strobe pulse signal with 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 does " clear 0 " operation at the rising edge of power frequency square wave, " adding 1 " operation is done with a less step value at the other times o'clock of power frequency square wave, step value can get the periodic quantity of intercycle fixed clock, and namely each clock period does " adding 1 " operation.When timers value reaches phase settings, produce rising edge, adjustment phase place and/or the object of dutycycle are exactly between the high-energy district of total energy alignment civil power when ensureing that stroboscopic lamp is lighted at every turn and exposure region.
In a preferred embodiment, the dutycycle of strobe pulse signal is adjustable, and its span needs to guarantee to drive stroboscopic lamp normally to light and guarantees that described stroboscopic is lighted between interval and described exposure region and alternating current high-energy district exists and occurs simultaneously.Developer can to the adjustment of phase place and dutycycle, so can make between stroboscopic point clear zone and exposure region and high-energy district exists and occurs simultaneously; In preferred mode, described common factor is between described exposure region.As can be seen here, when exposing, be belong to traffic lights brightness brighter (corresponding described high-energy district) and stroboscopic lamp is in illuminating state (for stroboscopic point clear zone) owing to having portion of time between exposure region at least at every turn.So, camera has an opportunity to obtain stroboscopic lamp light filling when exposing can be improved, and reference object is comparatively bright.In preferably mode; owing to usually can compare end between exposure region, the common factor of three can become between exposure region by adjustment completely, and the picture quality now photographed will be higher; know the example in reference diagram 8, dropped between exposure region in high-energy district and stroboscopic point clear zone simultaneously.
Relative to prior art, it is synchronous to control stroboscopic that the present invention does not re-use field sync signal, but using power frequency square wave as exposure sync and the synchronous collective reference source of stroboscopic, achieve exposure sync and stroboscopic is synchronous with very simple structure and very cheap cost simultaneously, very practical in the supervisory system of field of traffic.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within the scope of protection of the invention.
Claims (7)
1. a synchronizer for camera, this device comprises: square wave output unit, exposure sync unit and stroboscopic lock unit; It is characterized in that:
Square wave output unit, for generating and exporting power frequency square wave, wherein this power frequency side's wave frequency is N times of mains electricity frequency, and wherein N is natural number;
Described exposure sync unit, be connected to described square wave output unit, and for the power frequency square wave that uses square wave output unit to export as generating Control timing sequence signal with reference to source with between the exposure region controlling camera, make between the exposure region of camera, to cover at least part of predefined alternating current high-energy district;
Described stroboscopic lock unit, be connected to described square wave output unit, and light interval as generating strobe pulse signal with reference to source with the stroboscopic controlling stroboscopic lamp for the power frequency square wave that uses square wave output unit to export, make described stroboscopic light between interval and described exposure region and alternating current high-energy district exists and occurs simultaneously;
Described square wave output unit also comprises: select module and reference square wave generation module; Wherein be used for generating reference square wave with reference to square wave generation module, described selection module is used for selecting the output of rectification circuit as power frequency square wave when rectification circuit has output; And for selecting the reference square wave generated with reference to square wave generation module as power frequency square wave when rectification circuit does not export.
2. device as claimed in claim 1, it is characterized in that, described common factor is between exposure region.
3. device as claimed in claim 1, it is characterized in that, described square wave output unit comprises rectification circuit, and described rectification circuit is used for generating power frequency square wave according to mains electricity.
4. device as claimed in claim 1, it is characterized in that, the frequency of described mains electricity is 50HZ, and described power frequency side wave frequency is 100HZ.
5. device as claimed in claim 1, is characterized in that, described stroboscopic lock unit as with reference to source, and uses default phase parameter and/or duty cycle parameters to generate described strobe pulse signal for the power frequency square wave that uses square wave output unit and exports.
6. device as claimed in claim 5, it is characterized in that, the span of the dutycycle of described strobe pulse signal is guarantee to drive stroboscopic lamp normally to light and guarantee that described stroboscopic is lighted between interval and described exposure region and alternating current high-energy district exists the span of occuring simultaneously.
7. device as claimed in claim 1, is characterized in that described predefined alternating current high-energy district covers crest or the trough of mains electricity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210264447.0A CN102789113B (en) | 2012-07-27 | 2012-07-27 | A kind of synchronizer for camera |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210264447.0A CN102789113B (en) | 2012-07-27 | 2012-07-27 | A kind of synchronizer for camera |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102789113A CN102789113A (en) | 2012-11-21 |
| CN102789113B true CN102789113B (en) | 2015-09-09 |
Family
ID=47154553
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210264447.0A Active CN102789113B (en) | 2012-07-27 | 2012-07-27 | A kind of synchronizer for camera |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102789113B (en) |
Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102801921B (en) * | 2012-08-16 | 2015-05-06 | 浙江宇视科技有限公司 | Bayonet camera |
| TWI502174B (en) | 2013-05-14 | 2015-10-01 | Pixart Imaging Inc | Optical detecting devcie and related method of synchronization adjustment |
| 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 |
| CN103491679B (en) * | 2013-09-13 | 2015-10-21 | 南京工程学院 | A kind of 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202153796U (en) * | 2011-07-06 | 2012-02-29 | 上海渠瀚实业有限公司 | LED video synchronization light compensation light source controller applied to electronic police system |
| CN102446417A (en) * | 2011-11-10 | 2012-05-09 | 中盟智能科技（苏州）有限公司 | Method and device for snapshot control of traffic camera |
-
2012
- 2012-07-27 CN CN201210264447.0A patent/CN102789113B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202153796U (en) * | 2011-07-06 | 2012-02-29 | 上海渠瀚实业有限公司 | LED video synchronization light compensation light source controller applied to electronic police system |
| CN102446417A (en) * | 2011-11-10 | 2012-05-09 | 中盟智能科技（苏州）有限公司 | Method and device for snapshot control of traffic camera |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102789113A (en) | 2012-11-21 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102789113B (en) | A kind of synchronizer for camera | |
| CN106538055B (en) | Synchronization PWM light modulations with random phase | |
| CN101296541B (en) | Frequency-flashing light source control device | |
| CN103442486B (en) | High-luminance LED strobe lamp | |
| CN102375973B (en) | Face recognition method and system, and infrared back light compensation method and system | |
| US9148581B2 (en) | Multi-function control illumination device | |
| CN102081278A (en) | Flash control method and device | |
| CN104506779B (en) | A kind of traffic lights color antidote and picture pick-up device | |
| CN101414095A (en) | Control method of video camera synchronous LED flash light compensation | |
| CN102573207B (en) | Lighting device and illumination apparatus using same | |
| CN105407611A (en) | Remote intelligent control system for light-compensating lamps | |
| CN102636936A (en) | Intelligent LED (light-emitting diode) video synchronizing impulse stroboscopic supplemental lighting device | |
| CN101977284A (en) | Image pickup system and image pickup method | |
| CN102256066A (en) | Infrared high speed ball and method for intelligently adjusting brightness of infrared lamp by infrared high speed ball | |
| CN101977285A (en) | Shooting system and shooting method | |
| CN102448232A (en) | LED (light-emitting diode) lighting controller with sensitization function | |
| KR102216934B1 (en) | Led lighting control apparatus using frequency of commercial ac power source | |
| CN111935414B (en) | Image acquisition method, light-emitting control method, related equipment and system | |
| JP5552022B2 (en) | Lighting device and lighting apparatus using the same | |
| CN105827982B (en) | Triggering method, device and the controller for triggering method of LED light supplement lamp | |
| CN102801921B (en) | Bayonet camera | |
| CN101404727A (en) | Method for activating LED illumination by high-definition digital camera | |
| CN103957361B (en) | The exposure method and its device of a kind of monitoring camera | |
| KR101424245B1 (en) | multi dimming control apparatus | |
| NL2021044B1 (en) | LED driver and method of operating a camera |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |