CN109727460A - Capturing system based on traffic lights - Google Patents
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- CN109727460A CN109727460A CN201910208047.XA CN201910208047A CN109727460A CN 109727460 A CN109727460 A CN 109727460A CN 201910208047 A CN201910208047 A CN 201910208047A CN 109727460 A CN109727460 A CN 109727460A
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Abstract
The invention discloses a kind of capturing systems based on traffic lights, traffic lights, video camera and power frequency supply including being set to crossing；Traffic lights include display module, power supply IC and variable reference module；The synchronous control signal that variable reference module is used to be issued according to power frequency supply replaces output reference voltage by predeterminated frequency, and the Voltage Reference end of power supply IC is made to input alternately reference voltage；Power supply IC adjusts output alternative current to display module, so that display module alternately issues light or half-light by predeterminated frequency for the alternating reference voltage that Voltage Reference end inputs to be compared with preset reference voltage, according to comparison result；Video camera is used to press predeterminated frequency according to synchronous control signal, and traffic lights and place crossing are captured with image when display module obfuscation light.The present invention can allow color of image when video capture not to be distorted, and ensure the normal use of shooting image.
Description
Technical field
The present invention relates to traffic lights technical field more particularly to a kind of capturing systems based on traffic lights.
Background technique
With the development of social economy.Urban transport problems becomes the focus of social growing interest.Traffic lights are extensive
Be distributed on road, be to guarantee the unimpeded and safe basis of road traffic.It is that a kind of serious traffic is separated that motor vehicle, which makes a dash across the red light,
Zhang Hangwei can cause great threat to traffic safety, cause traffic order chaotic, bring burden to urban transportation, give life wealth
It is lost caused by production very huge.
Red light violation is captured currently, loading onto capturing system in each crossroad, to record the behavior of making a dash across the red light.
In the video camera shooting of capturing system, due to the LED display unit of traffic lights to stablize constant current driving, camera shooting will lead to
The red eye cross-color of machine shooting is extremely serious, and the red light jaundice blushing of candid photograph is obvious, and it is tight that there are cross-colors
The problem of weight.
Summary of the invention
Capturing system provided by the invention based on traffic lights, main purpose is to overcome drives due to stablizing constant current
When dynamic traffic lights and video camera cooperate, the red light jaundice blushing that there is the signal lamp for capturing image is obvious, color
It is distorted serious defect.
In order to solve the above technical problems, the present invention adopts the following technical scheme:
A kind of capturing system based on traffic lights, traffic lights, video camera and work including being set to crossing
Frequency power；
The traffic lights include display module, power supply IC and variable reference module；
The variable reference module is connect, for acquiring respectively with the Voltage Reference end of the power supply IC and power frequency supply
The synchronous control signal that the power frequency supply issues, and alternately exported by predeterminated frequency with reference to electricity according to the synchronous control signal
Pressure makes the Voltage Reference end of power supply IC input alternately reference voltage；
The power supply IC, connect with the display module and power frequency supply respectively, for inputting the Voltage Reference end
Alternating reference voltage be compared with preset reference voltage, output alternative current is adjusted to the display according to comparison result
Module, so that display module alternately issues light or half-light by predeterminated frequency；
The video camera, for pressing predeterminated frequency according to the synchronous control signal, to traffic lights and place crossing
Capture image when display module obfuscation light.
As an embodiment, the variable reference module includes the first sampling resistor, the second sampling resistor, power supply
Circuit, switching tube, single-chip microcontroller and optocoupler sample circuit；
First sampling resistor is connect with the Voltage Reference end of the power supply IC and electric power loop respectively；
The optocoupler sample circuit, connect with the single-chip microcontroller, the synchronously control issued for acquiring the power frequency supply
Signal, and the synchronous control signal is transmitted to single-chip microcontroller；
Second sampling resistor is connect with the Voltage Reference end of the power supply IC, and passes through the switching tube and power supply
Circuit connection；
The single-chip microcontroller is connect with the switching tube, is pressed for controlling the switching tube according to the synchronous control signal
Predeterminated frequency on or off makes second sampling resistor and electric power loop on or off.
As an embodiment, the switching tube is metal-oxide-semiconductor.
As an embodiment, the ratio of the resistance value of the resistance value and the first sampling resistor of first sampling resistor is greater than
75。
As an embodiment, the model STC15F100W of the single-chip microcontroller.
As an embodiment, the traffic signals further include transformer, rectification circuit and regulated power supply；
The rectification circuit, respectively with the transformer, regulated power supply, power supply IC and optocoupler sample circuit, for pair
It is rectified by the synchronous control signal of transformer pressure-reducing, the synchronous control signal after rectification is exported respectively to pressure stabilizing electricity
Source, power supply IC and optocoupler sample circuit；
The regulated power supply is connect with the single-chip microcontroller, for providing operating voltage for single-chip microcontroller.
As an embodiment, the rectification circuit is rectifier diode.
As an embodiment, the model LM7805 of the regulated power supply.
As an embodiment, the single-chip microcontroller in the variable reference module is replaced by driving unit.
As an embodiment, the model LM2596 of the power supply IC.
Compared with prior art, the technical program has the advantage that
Capturing system provided by the invention based on traffic lights makes power supply IC by default by variable reference module
Rate-adaptive pacemaker alternative current is to display module, so that display module alternately issues light or half-light by predeterminated frequency；Allow video camera
Predeterminated frequency is pressed according to the synchronous control signal, traffic lights and place crossing are captured with figure when display module obfuscation light
Picture.To which color of image when video capture will not be distorted, the normal use of shooting image is ensured.
Detailed description of the invention
Fig. 1 is the structural schematic diagram for the capturing system based on traffic lights that the embodiment of the present invention one provides；
Fig. 2 is that the structure of the traffic lights of the capturing system provided by Embodiment 2 of the present invention based on traffic lights is shown
It is intended to；
Fig. 3 is that the structure of the traffic lights for the capturing system based on traffic lights that the embodiment of the present invention three provides is shown
It is intended to.
In figure: 1, traffic lights；11, display module；12, power supply IC；131, the first sampling resistor；132, the second sampling
Resistance；133, electric power loop；134, switching tube；135, single-chip microcontroller；136, optocoupler sample circuit；137, driving unit；14, transformation
Device；15, rectification circuit；16, regulated power supply；2, video camera；3, power frequency supply.
Specific embodiment
Below in conjunction with attached drawing, the technical characteristic and advantage above-mentioned and other to the present invention are clearly and completely described,
Obviously, described embodiment is only section Example of the invention, rather than whole embodiments.
Referring to Fig. 1, the capturing system based on traffic lights 1 that the embodiment of the present invention one provides, including it is set to road
Traffic lights 1, video camera 2 and the power frequency supply 3 of mouth；
Traffic lights 1 include display module 11, power supply IC12 and variable reference module；
Variable reference module is connect, for acquiring power frequency electric respectively with the Voltage Reference end of power supply IC12 and power frequency supply 3
The synchronous control signal that source 3 issues, and output reference voltage is replaced by predeterminated frequency according to synchronous control signal, make power supply IC12
Voltage Reference end input alternately reference voltage；
Power supply IC12 is connect with display module 11 and power frequency supply 3 respectively, the alternating ginseng for inputting Voltage Reference end
Voltage is examined to be compared with preset reference voltage, according to comparison result adjustment output alternative current to display module 11, so that
Display module 11 alternately issues light or half-light by predeterminated frequency；
Video camera 2 grabs traffic lights 1 and place crossing for pressing predeterminated frequency according to the synchronous control signal
Clap the image when obfuscation light of display module 11.
It should be noted that the effect that traffic instruction is played at crossing is arranged in traffic lights 1；Display module 11 can be
LED light emitting diode passes through arranged in series composition in parallel, can be round or certain signal designation pattern, can show reddish yellow indigo plant
Instruction color, display module 11 alternately issues light or half-light by predeterminated frequency under power supply IC12 control.For each lamp
For color, light or half-light can be alternately displayed.In this present embodiment, main is that display module 11 is displayed in red
When, bright red light and dark red light can be shown by predeterminated frequency.As long as guarantee that video camera 2 is captured, display module 11 is shown secretly
Light has that cross-color is serious with regard to can solve shooting image.And light be see demand to meet human eye light, then
The light alternately displayed under predeterminated frequency is able to satisfy eye-observation demand, have the image that video camera 2 can be made to capture that face is not present
Colour distortion, and do not need improving to video camera 2.
In this present embodiment, display module 11 can be made by predeterminated frequency by power supply IC12 and the cooperation of variable reference module
Light or half-light are alternately issued, then video camera 2 is made to capture image when shading light to module.Variable reference module is controlled according to synchronous
Signal processed replaces output reference voltage by predeterminated frequency, and it is according to synchronous control signal by pre- that alternating, which exports different reference voltages,
If frequency replaces output reference voltage.Power supply IC12 is the driving chip of display module 11, and model can be LM2596；Power supply
The Voltage Reference end of IC12 replaces input reference voltage by predeterminated frequency.For example, reference voltage is two values, the two values are by pre-
If frequency alternately inputs, reference voltage is equipped in power supply IC12 and is compared with reference voltage, not according to comparison result output
With the electric current of size.The reference voltage that can be input is small, and the electric current exported more afterwards is small, so that display module 11 is shown secretly
Light；Alternately the reference voltage of input is big, and adjustment output electric current is big more afterwards, so that display module 11 shows light, it is such dark
Light and light are alternately.
In order to make video camera 2 capture image when shading light to module, as long as keeping display module 11 bright in one cycle
The duty ratio of light is sufficiently small, can avoid the 2 shutter opening time of video camera.The shutter of usual video camera 2 can be with 1/25~1/
It is adjusted between 100000.In this present embodiment, it when the shutter of video camera 2 can be set no more than 1/200, is exported by 100HZ bright
The duty ratio of light needs to be less than 50%.Certainly, avoiding shutter opening, generally speaking there are three types of methods: the first, sync pulse jamming,
The shooting of video camera 2 power frequency supply 3 all synchronous with signal lamp output is synchronous, issues just when shooting shutter opening with regard to signal lamp dark
Light；The second, asynchronous shooting, 2 frame per second of video camera are 25 frames/second, and signal lamp output frequency uses 58HZ, it is ensured that having when shooting
Most pictures can photograph half-light；Third, signal triggering, video camera 2 export a synchronous control signal when capturing, and control is aobvious
Show the obfuscation light of module 11；That is power frequency supply 3 can be a part of video camera 2, when capturing, export a synchronous control
Signal processed, the control control obfuscation light of display module 11.The frequency that signal lamp alternately shines can have specific requirements to determine, for example,
100HZ is needed under the conditions of sync pulse jamming, asynchronous shooting can be realized as low as 58HZ by 135 internal preset of single-chip microcontroller, or benefit
It is triggered with power frequency supply 3.Frequency, which is higher than human eye, to be perceived, i.e., people cannot be allowed to feel flashing；The light for the illuminated light that signal lamp goes out
It is strong sufficiently high, it can be perceived by the human eye, signal lamp is made to realize basic instruction function.Power frequency supply 3 be it is existing, can be video camera
2 a part is also possible to be separately provided, and the synchronous control signal that power frequency supply 3 exports just is power frequency.Signal lamp obfuscation light
Light intensity is sufficiently low, make 2 sensing element of video camera will not overexposure, correctly shoot signal lamp color；Signal lamp is bright dark alternate
Frequency may be designed to synchronous with power frequency to meet the synchronous the needs of capturing of video camera 2, guarantee the signal lamp color of each frame picture
It is all undistorted；The bright dark alternate frequency of signal lamp is also possible to asynchronous with power frequency, can guarantee the video camera 2 of asynchronous candid photograph also
Most of signal lamp colors for capturing picture are undistorted.For making a dash across the red light, as long as being taken the photograph when display module 11 is displayed in red
Cross-color is not present in the image that camera 2 is captured.Enable the image clapped as evidence, it is convenient to provide to law enforcement.
Capturing system provided by the invention based on traffic lights 1, by variable reference module make power supply IC12 by
Predeterminated frequency exports alternative current to display module 11, so that display module 11 alternately issues light or half-light by predeterminated frequency；
It allows video camera 2 according to the synchronous control signal by predeterminated frequency, display module 11 is captured to traffic lights 1 and place crossing
Image when obfuscation light.To which color of image when video camera 2 being allowed to capture will not be distorted, the normal use of shooting image is ensured.
The variable reference module in traffic signals is described in detail below, variable reference module can be allowed to hand over by frequency
For output reference voltage.
As shown in Fig. 2, variable reference module includes the first sampling resistor 131, the second sampling resistor in embodiment two
132, electric power loop 133, switching tube 134, single-chip microcontroller 135 and optocoupler sample circuit 136；First sampling resistor 131 respectively with
The Voltage Reference end of power supply IC12 and electric power loop 133 connect；Optocoupler sample circuit 136 is connect with single-chip microcontroller 135, for acquiring
The synchronous control signal that power frequency supply 3 issues, and synchronous control signal is transmitted to single-chip microcontroller 135；Second sampling resistor 132 with
The Voltage Reference end of power supply IC12 connects, and is connect by switching tube 134 with electric power loop 133；Single-chip microcontroller 135 and switching tube
134 connections make the second sampling resistor for pressing predeterminated frequency on or off according to synchronous control signal control switch pipe 134
132 with 133 on or off of electric power loop.
The current sampling resistor of power supply IC12 when first sampling resistor 131 is the obfuscation light of display module 11, in display module
Working condition is constantly in when 11 work；The electric current of power supply IC12 is adopted when second sampling resistor 132 is 11 illuminated light of display module
One of sample resistance, that is in illuminated light, the second sampling resistor 132 and the first sampling resistor 131 are collectively as power supply IC12
Current sampling resistor.Voltage on power supply IC12 detection current sampling resistor compares with internal reference voltage again, adjustment output
The size of electric current, to realize constant current output.Output electric current can be changed by changing current sampling resistor value, to change display
The brightness of module 11.In other embodiments, the resistance value of the first sampling resistor 131 and the second sampling resistor 132 is by use environment
It determines, but the ratio of the resistance value of the first sampling resistor 131 and the resistance value of the first sampling resistor 131 is greater than 75.So that light
With half-light meet demand.First sampling resistor 131 and the second sampling resistor 132 determine light and half-light；Bright dark alternating frequency, hair
Light duty ratio, whether it is synchronous with power frequency component can all be adjusted by the software in single-chip microcontroller 135, as signal lamp can be according to environment
Illumination adjusts duty ratio, adapts to the variation of human eye or 2 shutter of video camera.
Current control circuit is formed using the first sampling resistor 131, the second sampling resistor 132 and switching tube 134, works as switch
After pipe 134 is opened, two sampling resistor parallel connections make power supply IC12 export larger current, 11 illuminated light of display module；Work as switching tube
After 134 close, the second sampling resistor 132 is disconnected, and only the first sampling resistor 131 is in sampling circuit, power supply IC12 output
Low current, the obfuscation light of display module 11.Switching tube 134 replaces on-off and just realizes the bright dark alternating of display module 11.Switching tube 134 can
Think metal-oxide-semiconductor, model can be CJ3400.And switching tube 134 replaces on-off and is determined by single-chip microcontroller 135, the letter of single-chip microcontroller 135
It number can be STC15F100W.Single-chip microcontroller 135 reads the synchronous control signal of optocoupler input, by preset fixed frequency and duty
Than the opening and closing of output pwm signal control metal-oxide-semiconductor, realize that the bright dark signal lamp of signal lamp alternately exports.Optocoupler sample circuit
136 can be made of EL817 and input current-limiting resistance, and half-wave signa is changed into 5V square-wave signal to single-chip microcontroller 135.Power supply returns
Road 133 is public 1 driving circuit of traffic lights.
Further, traffic signals further include transformer 14, rectification circuit 15 and regulated power supply 16；Rectification circuit 15,
Respectively with transformer 14, regulated power supply 16, power supply IC12 and optocoupler sample circuit 136, it is used to be depressured to by transformer 14
Synchronous control signal rectified, by the synchronous control signal after rectification export respectively to regulated power supply 16, power supply IC12 with
And optocoupler sample circuit 136；Regulated power supply 16 is connect with single-chip microcontroller 135, for providing operating voltage for single-chip microcontroller 135.Pressure stabilizing
The model of power supply 16 can be LM7805, export 135 working power of single-chip microcontroller.Rectification circuit 15 is rectifier diode, by
1N4007 diode composition, forms unidirectional fluctuating current to AC rectification, synchronous with to signal lamp power supply and single-chip microcontroller 135.
Input synchronous control signal is switched to low pressure 24V alternating current by transformer 14, and supply signal lamp uses.
As shown in figure 3, compared with embodiment two, difference is in embodiment three, the single-chip microcontroller in variable reference module
135 are replaced by driving unit 137.I.e. variable the reference module includes the first sampling resistor 131, the second sampling resistor 132, switching tube
134, driving unit 137, optocoupler sample circuit 136, transformer 14, rectification circuit 15 and regulated power supply 16.In embodiment two
On the basis of, single-chip microcontroller 135 is substituted with driving unit 137.If switching tube 134 is metal-oxide-semiconductor, driving unit 137 is just driven for MOS
It is dynamic.Can by outer triggering signal by 136 output signal driving triode of optocoupler sample circuit directly drive metal-oxide-semiconductor open or
It closes；When Triggerless input signal, metal-oxide-semiconductor, the access of the second sampling resistor 132, display module 11 are opened in MOS driving output
Work is in bright state；When having trigger signal input, metal-oxide-semiconductor is closed in MOS driving output, and the second sampling resistor 132 disconnects, and shows mould
Block 11 works in dark state；Trigger signal can be the same control signal of the input of power frequency supply 3, be also possible to individually control letter
Number.Purpose is the only triggering when needing to shoot, and display module 11 has higher average brightness；Trigger signal by video camera 2
Control, can meet different needs.
Although the invention has been described by way of example and in terms of the preferred embodiments, but it is not for limiting the present invention, any this field
Technical staff without departing from the spirit and scope of the present invention, may be by the methods and technical content of the disclosure above to this hair
Bright technical solution makes possible variation and modification, therefore, anything that does not depart from the technical scheme of the invention, and according to the present invention
Technical spirit any simple modifications, equivalents, and modifications to the above embodiments, belong to technical solution of the present invention
Protection scope.
Claims (10)
1. a kind of capturing system based on traffic lights, which is characterized in that traffic lights, camera shooting including being set to crossing
Machine and power frequency supply；
The traffic lights include display module, power supply IC and variable reference module；
The variable reference module is connect with the Voltage Reference end of the power supply IC and power frequency supply respectively, described for acquiring
The synchronous control signal that power frequency supply issues, and output reference voltage is replaced by predeterminated frequency according to the synchronous control signal,
The Voltage Reference end of power supply IC is set to input alternately reference voltage；
The power supply IC, connect with the display module and power frequency supply respectively, the friendship for inputting the Voltage Reference end
It is compared for reference voltage with preset reference voltage, output alternative current is adjusted to the display mould according to comparison result
Block, so that display module alternately issues light or half-light by predeterminated frequency；
The video camera captures traffic lights and place crossing for pressing predeterminated frequency according to the synchronous control signal
Image when display module obfuscation light.
2. as described in claim 1 based on the capturing system of traffic lights, which is characterized in that the variable reference module packet
Include the first sampling resistor, the second sampling resistor, electric power loop, switching tube, single-chip microcontroller and optocoupler sample circuit；
First sampling resistor is connect with the Voltage Reference end of the power supply IC and electric power loop respectively；
The optocoupler sample circuit, connect with the single-chip microcontroller, the synchronous control signal issued for acquiring the power frequency supply,
And the synchronous control signal is transmitted to single-chip microcontroller；
Second sampling resistor is connect with the Voltage Reference end of the power supply IC, and passes through the switching tube and electric power loop
Connection；
The single-chip microcontroller is connect with the switching tube, for controlling the switching tube by default according to the synchronous control signal
Frequency on or off makes second sampling resistor and electric power loop on or off.
3. as claimed in claim 2 based on the capturing system of traffic lights, which is characterized in that the switching tube is metal-oxide-semiconductor.
4. as claimed in claim 2 based on the capturing system of traffic lights, which is characterized in that first sampling resistor
The ratio of resistance value and the resistance value of the first sampling resistor is greater than 75.
5. as claimed in claim 2 based on the capturing system of traffic lights, which is characterized in that the model of the single-chip microcontroller
STC15F100W。
6. as claimed in claim 2 based on the capturing system of traffic lights, which is characterized in that the traffic signals further include
Transformer, rectification circuit and regulated power supply；
The rectification circuit is used for respectively with the transformer, regulated power supply, power supply IC and optocoupler sample circuit to process
The synchronous control signal of transformer pressure-reducing is rectified, and the synchronous control signal after rectification is exported respectively to regulated power supply, electricity
Source IC and optocoupler sample circuit；
The regulated power supply is connect with the single-chip microcontroller, for providing operating voltage for single-chip microcontroller.
7. as claimed in claim 6 based on the capturing system of traffic lights, which is characterized in that the rectification circuit is rectification
Diode.
8. as claimed in claim 6 based on the capturing system of traffic lights, which is characterized in that the model of the regulated power supply
For LM7805.
9. as claimed in claim 2 based on the capturing system of traffic lights, which is characterized in that in the variable reference module
Single-chip microcontroller replaced by driving unit.
10. as described in claim 1 based on the capturing system of traffic lights, which is characterized in that the model of the power supply IC
For LM2596.
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| CN201910208047.XA CN109727460A (en) | 2019-03-19 | 2019-03-19 | Capturing system based on traffic lights |
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| CN201910208047.XA CN109727460A (en) | 2019-03-19 | 2019-03-19 | Capturing system based on traffic lights |
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| CN110446035A (en) * | 2019-09-18 | 2019-11-12 | 深圳飞马机器人科技有限公司 | A kind of camera dynamic shoots the test macro of fuzziness |
| CN112907998A (en) * | 2019-11-19 | 2021-06-04 | 云南金隆伟业电子有限公司 | Flash light sensing transient brightness traffic signal lamp |
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