CN100466009C - Detecting device and method for realizing vehicle passing stop-line utilizing stop-line visual frequency signal - Google Patents
Detecting device and method for realizing vehicle passing stop-line utilizing stop-line visual frequency signal Download PDFInfo
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- CN100466009C CN100466009C CNB2007100234273A CN200710023427A CN100466009C CN 100466009 C CN100466009 C CN 100466009C CN B2007100234273 A CNB2007100234273 A CN B2007100234273A CN 200710023427 A CN200710023427 A CN 200710023427A CN 100466009 C CN100466009 C CN 100466009C
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Abstract
This invention relates to a test device and a method for testing over-parking lines of vehicles by parking-line video signals including a video shunt, a parking line signal judger, an integrator, a sampling circuit, a counter, a parking line decoder, a car-passing indicator, a car-passing sample circuit, a car-passing signal merge and a pulse width adjusting circuit connected in series, which can be widely used in electronic police equipment to judge if there are cars rushing the parking lines at red light to further use the output signals of the device to control camera or shooting devices of electronic police to record against-the-rule behaviors of vehicles.
Description
Technical field
The present invention relates to a kind of equipment that is used for traffic administration, especially a kind of improvement of motor vehicle red light violation checkout equipment belongs to the traffic control equipment technical field.
Background technology
Electronic police is the high-tech product of Modern Traffic management.This high technology equipment is used for machines motor vehicle violation phenomenon under steam and timely Taking Pictures recording, thereby provides more full and accurate foundation for violating the regulations the processing.Must have in the electronic police equipment and be used to detect the device of vehicle by stop line.Vehicle is arranged through stop line when at red light, can carry out Taking Pictures recording vehicles peccancy.Existing this type of device mainly can be divided into following a few class:
1. bury square coil near stop line underground, the magnetic flux change that produces when utilizing car to cross coil judgement has or not vehicle to pass through stop line.Because coil need be buried in below the road surface, thus the road surface must be destroyed during construction, must be through the approval of relevant departments, formality comparatively complexity and engineering cost is higher.And inductive coil can send the low-frequency electromagnetic wave signal when operate as normal, utilizes the low-frequency electromagnetic wave signal receiver to judge which crossing at an easy rate a long way off and is equipped with electronic police.Now the illegal receiver of existing on the market this kind is sold, and this will weaken the supervision of electronic police to traffic order greatly.
2. use camera realization vehicle to rush the automatic detection of stop line with " rushing the line alarm " function.Because this type of camera is equally very responsive to shade.When it was installed on two parallel tracks respectively, if wherein have car to rush across stop line on a track, its stronger shade might cause monitoring that the car that has of the camera generation error in an other track rushes across the signal of stop line.This method of utilizing the camera detection to have car to cross stop line is difficult to be put to practicality.And this method detects and wants seeking time longer, and difficulty satisfies the real-time requirement of traffic monitoring.
Summary of the invention:
Technical matters: the objective of the invention is to propose a kind of stop line vision signal realization vehicle that utilizes and cross the stop line pick-up unit, this device detects the whether device by stop line of vehicle by handling the stop line vision signal, this equipment can hang on the red and green signals lamp cross bar by height, need not to destroy the road surface in monitored track, need not to bury underground the coil that the detection vehicle is crossed stop line, can not send the low-frequency electromagnetic wave signal yet, so greatly reduce measuring ability by the possibility of artificial destruction, engineering cost is also lower simultaneously, thereby makes electronic police be more convenient for applying.
Technical scheme: in order to reach above purpose, whether motor vehicle of the present invention is crossed the stop line pick-up unit and is finished vehicle by the detection of stop line by handling the captured stop line vision signal of camera, has avoided the shortcoming of other classic method.Under the red light condition, utilize detected vehicle to cross the stop line signal, can in time take the photo of vehicles peccancy.Basic characteristics such as this device has circuit simply, reliably, need not to bury underground coil, and engineering cost is lower.
The vision signal of utilizing of the present invention realizes that vehicle crosses video shunt, stop line signal decision device, integrator, sample circuit, counter, the stop line code translator of stop line pick-up unit, the car indicator is arranged, the car sampling circuit is arranged, have that the car signal closes the road, pulse width modulation circuit is connected in series in proper order; Another output termination row of video shunt and the input end of field synchronization separation circuit, the line synchronizing signal output termination row sampling of row and field synchronization separation circuit produces the input end of circuit, the output terminal of row sampling generation circuit accesses the input end of sample circuit, the field sync signal output terminal of row and field synchronization separation circuit connects an input end of taking a sample and producing a circuit and the car indicator is arranged respectively, and the output terminal of a sampling generation circuit is connected to the input end of car sampling circuit; The input end of the white car signal interpretation of the output termination circuit of counter, the output terminal of white car signal interpretation circuit is connected to the input end that the car signal closes the road; The output terminal that decision threshold is set up circuit is connected to the input end of stop line signal decision device, by pulse width modulation circuit output the car signal is arranged.
The stop line detection method of crossing of utilizing vision signal realization vehicle to cross the stop line pick-up unit of the present invention is:
1. export) at first by the vision signal processing and amplifying of the video amplifier U11 in the video shunt in the video shunt, and by 8 pin of video amplifier U11 with the camera generation;
2.) the stop line signal decision circuit U 7A that is input in the stop line signal decision device of the vision signal after amplifying judges the high level line number in the vision signal, judge the 1 pin output of signal by stop line signal decision circuit U 7A, enter integrator, integrated signal is by the 7 pin output of stop line signal decision circuit U 7B;
3.) integrated signal line of input sampling generator U4A, with by the capable signal of pulse-width modulator U3A output with non-, the row signal is sampled, sampled signal is exported by take a sample 3 pin of generator U4A of row;
4.) count 10 pin " CLK " of circuit U 8 in the sample circuit output signal enter counter as clock signal, the video field signal of 3 pin of row and field synchronization separation vessel U1 output in row and the field synchronization separation circuit, when pulsewidth regulator U13B, delay, 11 pin that are input to counting circuit U8 are counted out white number of lines in the vision signal as reset signal;
5. when) the rolling counters forward value was big, white car signal interpretation circuit U 6B deciphered it, and producing has white car signal; Count value hour and when not reaching certain value, other color car code translator U10 deciphers it, is other color vehicles, and this signal carries out field sampling through car sampler U4B is arranged, and generation has the signal of other color cars; White car signal is arranged and have his car signal of its color having car signal combiner U4C to close the road, there is the car signal that the 8 pin output of car signal combiner U4C is being arranged, count value is less, but when reaching certain value, producing no car reset signal has car indicator U12 to having in the car indicator, and the reset signal that has car indicator U12 to produce not have other color cars has car sampler U4B to having in the car sampling circuit;
6.) vision signal is via row and field synchronization separation vessel U1 in row and the field synchronization separation circuit, isolate the 3 pin output of field signal by row and field synchronization separation vessel U1, the row signal is by the 5 pin output of row and field synchronization separation vessel U1, field signal is taken a sample to field signal by the field sampler U9 in the field sampling generation circuit; Sampled signal is to there being the car sampler U4B that has in the car sampling circuit that the field sampling of other color car signals is arranged;
7.) have car to close the road signal through the 8 pin output of car signal combiner U4C is arranged, regulate pulsewidth through the pulse-width modulator U3B in the pulse width modulation circuit, 5 pin of pulse-width modulator U3B produce low level, have lighted the car pilot lamp.
The method of vision signal processing and amplifying is:
1.) at first along separate routes the vision signal that camera produces is carried out the signal processing and amplifying by video;
2.) vision signal after amplifying is input to stop line signal decision device, and the high level line number in the vision signal is judged and amassed out corresponding white appliances riglet number by integrator;
3.) decision threshold is set up circuit and is set up the dynamic decision thresholding that adapts with ambient light intensity;
4.) the integrator output signal by the capable signal of row and field synchronization separation circuit generation in the capable sampling of sample circuit;
5.) the sample circuit output signal is counted out white number of lines in the vision signal as the counter clock signal;
6. when) the rolling counters forward value was big, meter digital arrived white car signal interpretation circuit, expression adularescent car line ball; It is little that the stop line code translator translates count value, and when not reaching certain value, showing has other color car line balls, and producing has the car signal to enter the car indicator; Stop line code translator count value is little but when reaching certain value, produce no car reset signal and entered the car indicator; Certain value is the white number of lines of stop line;
7.) vision signal is isolated field signal via row and field synchronization separation circuit, and field signal produces circuit by the field sampling, and field signal is taken a sample;
8.) sampled signal is having the sampling of car sampling circuit with the car signal that has that has the car indicator to produce, and generation at last has the signal of other color car line balls;
9.) adularescent car line ball signal with have other color car line ball signals having the car signal to close Lu Helu, producing has car line ball signal;
10.) there is car line ball signal to regulate pulsewidth, is presented on the pilot lamp at last by pulse width modulation circuit.
Vehicle of the present invention is crossed the stop line pick-up unit and is finished the judgement whether vehicle is crossed stop line by the stop line vision signal of handling camera and sending, and has avoided the shortcoming of other classic method.Need destroy the road surface when detecting as coil, must be through the approval of relevant departments, formality comparatively complexity and engineering cost is higher.And inductive coil can send the low-frequency electromagnetic wave signal when operate as normal, utilizes the low-frequency electromagnetic wave signal receiver to judge which crossing at an easy rate a long way off and is equipped with electronic police.Now the illegal receiver of existing on the market this kind is sold, and this will weaken the supervision of electronic police to traffic order greatly; During with camera " rushing line detects " Function detection, be difficult to avoid the caused flase drop of vehicle shadow to be surveyed again.Under the red light condition, the vehicle that utilizes this device to provide is crossed the stop line signal, can in time take the photo of vehicles peccancy.This device have circuit simple, detect the reliability height, need not to bury underground coil, engineering cost is lower, basic characteristics such as is difficult for being found, hidden, thereby makes electronic police be more convenient for applying.
Beneficial effect: whether motor vehicle of the present invention is crossed the stop line pick-up unit and is finished vehicle by the detection of stop line by handling the captured stop line vision signal of camera, has avoided the shortcoming of other classic method.Under the red light condition, utilize detected vehicle to cross the stop line signal, can in time take the photo of vehicles peccancy.Basic characteristics such as this device has circuit simply, reliably, need not to bury underground coil, and engineering cost is lower.
This device detects vehicle whether by the device of stop line by handling the stop line vision signal, detects reliability and reaches more than 90%.This equipment can hang on the red and green signals lamp cross bar by height, need not to destroy the road surface in monitored track, need not to bury underground the coil that the detection vehicle is crossed stop line, can not send the low-frequency electromagnetic wave signal yet, so greatly reduce measuring ability by the possibility of artificial destruction, engineering cost is also lower simultaneously, thereby makes electronic police be more convenient for applying.
This installs 24 continuous throughout the twenty-four hour24s, need not manual intervention, can increase substantially the stop line vehicle and detect
Rate.Because the stop line vehicle checking method excessively that present embodiment proposed is simple and ingenious, can use commercially available components and parts to constitute, therefore practical, degree of being practical height, cost are very economical.
Description of drawings
Fig. 1 is the testing circuit block diagram of one embodiment of the present of invention;
Fig. 2 is one embodiment of the present of invention partial circuit figure one;
Fig. 3 is one embodiment of the present of invention partial circuit figure two;
Fig. 4 is one embodiment of the present of invention partial circuit figure three;
Have among the above figure: video shunt 1, stop line signal decision device 2, integrator 3, sample circuit 4, counter 5, stop line code translator 6, car indicator 7 is arranged, car sampling circuit 8 is arranged, have the car signal to close road 9, decision threshold is set up circuit 10, the row sampling produces circuit 11, white car signal interpretation circuit 12, row and field synchronization separation circuit 13, the field sampling produces circuit 14, pulse width modulation circuit 15.
Embodiment
The vehicle of present embodiment is crossed the circuit structure block diagram of stop line checkout equipment and is seen Fig. 1.Vision signal is taken by overhead camera on cross bar and is obtained.
The present invention utilize video that vision signal realizes that vehicle crosses the stop line pick-up unit along separate routes 1, stop line signal decision device 2, integrator 3, sample circuit 4, counter 5, stop line code translator 6, car indicator 7 arranged, car sampling circuit 8 is arranged, have the car signal to close road 9, pulse width modulation circuit 15 orders are connected in series; Another output termination row of video shunt 1 and the input end of field synchronization separation circuit 13, the line synchronizing signal output termination row sampling of row and field synchronization separation circuit 13 produces the input end of circuit 11, the output terminal of row sampling generation circuit 11 accesses the input end of sample circuit 4, the field sync signal output terminal of row and field synchronization separation circuit 13 connects an input end of taking a sample and producing a circuit 14 and car indicator 7 is arranged respectively, and the output terminal of a sampling generation circuit 14 is connected to the input end of car sampling circuit 8; The input end of the white car signal interpretation of the output termination circuit 12 of counter 5, the output terminal of white car signal interpretation circuit 12 is connected to the input end that the car signal closes road 9; The output terminal that decision threshold is set up circuit 10 is connected to the input end of stop line signal decision device 2, by pulse width modulation circuit 15 outputs the car signal is arranged.
The inventory of whole integrated circuit:
The serial number name model
Capable and the field synchronization separation vessel LM1881N of U1
U2 Sheffer stroke gate 74HC04
U3 pulse-width modulator 74HC123
The capable sampling of U4A generator 74HC04
U4B has car sampler 74HC04
U4C has car signal combiner 74HC04
U5 Sheffer stroke gate 74HC30
The white car signal interpretation of U6B circuit 74HC27
U7 stop line signal decision circuit LM324 (comprising U7A U7B)
U8 counting circuit 4020
U9 field sampler 4020
Other color car code translator of U10 74HC30
U11 video amplifier NE5539
U12 has car indicator 74HC74
U13 pulse-width modulator 74HC123 (comprising U13A, U13B)
Crossing the stop line detection method is:
1. export) at first by the vision signal processing and amplifying of the video amplifier U11 in the video shunt 1 in the video shunt, and by 8 pin of video amplifier U11 with the camera generation;
2.) the stop line signal decision circuit U 7A that is input in the stop line signal decision device 2 of the vision signal after amplifying judges the high level line number in the vision signal, judge the 1 pin output of signal by stop line signal decision circuit U 7A, enter integrator 3, integrated signal is by the 7 pin output of stop line signal decision circuit U 7B;
3.) integrated signal line of input sampling generator U4A, with by the capable signal of pulse-width modulator U3A output with non-, the row signal is sampled, sampled signal is exported by take a sample 3 pin of generator U4A of row;
4.) count 10 pin " CLK " of circuit U 8 in the sample circuit 4 output signal enter counters 5 as clock signal, the video field signal of 3 pin of row and field synchronization separation vessel U1 output in row and the field synchronization separation circuit 13, when pulsewidth regulator U13B, delay, 11 pin that are input to counting circuit U8 are counted out white number of lines in the vision signal as reset signal;
5. when) counter 5 count values were big, white car signal interpretation circuit U 6B deciphered it, and producing has white car signal; Count value hour and when not reaching certain value, other color car code translator U10 deciphers it, is other color vehicles, and this signal carries out field sampling through car sampler U4B is arranged, and generation has the signal of other color cars; White car signal is arranged and have his car signal of its color having car signal combiner U4C to close the road, there is the car signal that the 8 pin output of car signal combiner U4C is being arranged, count value is less, but when reaching certain value, producing no car reset signal has car indicator U12 to having in the car indicator 7, and the reset signal that has car indicator U12 to produce not have other color cars has car sampler U4B to having in the car sampling circuit 8;
6.) vision signal is via row and field synchronization separation vessel U1 in row and the field synchronization separation circuit 13, isolate the 3 pin output of field signal by row and field synchronization separation vessel U1, the row signal is by the 5 pin output of row and field synchronization separation vessel U1, field signal is taken a sample to field signal by the field sampler U9 in the field sampling generation circuit 14; Sampled signal is to there being the car sampler U4B that has in the car sampling circuit 8 that the field sampling of other color car signals is arranged;
7.) have car to close the road signal through the 8 pin output of car signal combiner U4C is arranged, regulate pulsewidth through the pulse-width modulator U3B in the pulse width modulation circuit 15,5 pin of pulse-width modulator U3B produce low level, have lighted the car pilot lamp.
The method of vision signal processing and amplifying is:
1.) vision signal that is at first produced by 1 pair of camera of video shunt is carried out the signal processing and amplifying;
2.) vision signal after amplifying is input to stop line signal decision device 2, and the high level line number in the vision signal is judged and amassed out corresponding white appliances riglet number by integrator 3;
3.) decision threshold is set up circuit 10 and is set up the dynamic decision thresholding that adapts with ambient light intensity;
4.) integrator 3 output signals are gone sampling by the capable signal of row and field synchronization separation circuit 13 generations at sample circuit 4;
5.) sample circuit 4 output signals are counted out white number of lines in the vision signal as counter 5 clock signals;
6. when) counter 5 count values were big, meter digital arrived white car signal interpretation circuit 12, expression adularescent car line ball; It is little that stop line code translator 6 translates count value, and when not reaching certain value, showing has other color car line balls, and producing has the car signal to enter car indicator 7; Stop line code translator 6 count values are little but when reaching certain value, produce no car reset signal and entered car indicator 7; Certain value is the white number of lines of stop line;
7.) vision signal is isolated field signal via row and field synchronization separation circuit 13, and field signal produces circuit 14 by the field sampling, and field signal is taken a sample;
8.) sampled signal is having 8 sampling of car sampling circuit with the car signal that has that has car indicator 7 to produce, and generation at last has the signal of other color car line balls;
9.) adularescent car line ball signal closes the road with other color car line ball signals are arranged there being the car signal to close road 9, and producing has car line ball signal;
10.) there is car line ball signal to regulate pulsewidth, is presented on the pilot lamp at last by pulse width modulation circuit 15.
Detailed process is: at first stop line is the white line of a certain width, when shooting with video-corder with video camera, for row signal (cycles 64 μ s, from left to right scanning) vision signal is rendered as a white line, and the vision signal of stop line is rendered as the white line of a certain width of being made up of many capable signal white lines in a field duration (20ms).At this moment, the vision signal of stop line is inputed to vision signal along separate routes 1, shunt is amplified and carried out to vision signal.Wherein one road signal inputs in the stop line signal decision 2, and decision level obtains by set up automatic decision threshold level in circuit.Automatically decision threshold is exactly that the average level of the number of winning the confidence is as the decision level in the stop line signal decision 2 with vision signal 1 output signal process filter capacitor processing along separate routes.This level is not a fixed numeric values, but along with the variation of ambient light changes, then level is higher by force for light, and then level is lower a little less than the light.The output signal s2 of stop line signal decision 2 enters decision device output signal integration 3 subsequently, signal is carried out integration obtain signal s3; Another road output signal of 1 then is input to row to vision signal along separate routes, field sync signal is separated in 13, and purpose is to isolate line synchronizing signal s13 of vision signal (1) and field sync signal s13 (2); Line synchronizing signal s13 after the separation (1) sends into row sampling generation 11 and obtains row sampled signal s11, utilizes s11 to the s3 sample of signal then, thereby obtains stop line count pulse s4; Counting 5 is reset to " 0 " when the beginning of each, the line number that stop line is occupied (occupying approximately in each about 40 row) is counted then.There is car indication 7 when each beginning, to be set and is " 1 ", during no car, be reset to " 0 " by stop line decoded signal s6 about one centre position; And when car is arranged, will keep " 1 ", after field sampled signal s14 sampling, output has car signal s8.
When by stop line be the extremely strong vehicle of a light colour (such as white car) or reflectance the time, the value of signal S3 is bigger, so it is bigger to count 5 count value, can finish counting by counting in 5 the high position of counter.By white car signal interpretation 12, provide white car signal s12 again, be input to the car signal and closed road 9.By what pulse width modulation circuit 15 output had a requirement bandwidth the car signal arranged at last.
Claims (3)
1. one kind is utilized vision signal to realize that vehicle crosses the stop line pick-up unit, the video that it is characterized in that this device along separate routes (1), stop line signal decision device (2), integrator (3), sample circuit (4), counter (5), stop line code translator (6), car indicator (7) arranged, car sampling circuit (8) is arranged, have the car signal to close road (9), pulse width modulation circuit (15) order is connected in series; Another output termination row of video shunt (1) and the input end of field synchronization separation circuit (13), the line synchronizing signal output termination row sampling of row and field synchronization separation circuit (13) produces the input end of circuit (11), the output terminal of row sampling generation circuit (11) accesses the input end of sample circuit (4), the field sync signal output terminal of row and field synchronization separation circuit (13) connects the input end that the field sampling produces circuit (14) and car indicator (7) are arranged respectively, and the output terminal of a sampling generation circuit (14) is connected to the input end of car sampling circuit (8); The input end of the white car signal interpretation of the output termination circuit (12) of counter (5), the output terminal of white car signal interpretation circuit (12) is connected to the input end that the car signal closes road (9); The output terminal that decision threshold is set up circuit (10) is connected to the input end of stop line signal decision device (2), by pulse width modulation circuit (15) output the car signal is arranged.
One kind as claimed in claim 1 utilize that vision signal realizes that vehicle crosses the stop line pick-up unit cross the stop line detection method, it is characterized in that this method is:
1. export) at first by the vision signal processing and amplifying of the video amplifier U11 in the video shunt (1), and by 8 pin of video amplifier U11 with the camera generation;
2.) the stop line signal decision circuit U 7A that is input in the stop line signal decision device (2) of the vision signal after amplifying judges the high level line number in the vision signal, judge the 1 pin output of signal by stop line signal decision circuit U 7A, enter integrator (3), integrated signal is by the 7 pin output of stop line signal decision circuit U 7B;
3.) integrated signal line of input sampling generator U4A, with by the capable signal of pulse-width modulator U3A output with non-, sampled signal is exported by take a sample 3 pin of generator U4A of row;
4.) count 10 pin " CLK " of circuit U 8 in sample circuit (4) the output signal enter counter (5) as clock signal, the video field signal of 3 pin of row and field synchronization separation vessel U1 output in row and the field synchronization separation circuit (13), when pulsewidth regulator U13B, delay, 11 pin that are input to counting circuit U8 are counted out white number of lines in the vision signal as reset signal;
5. when) counter (5) count value is big, white car signal interpretation circuit U 6B dialogue car signal interpretation, producing has white car signal; Count value hour and when not reaching certain value, other color car code translator U10 is to the signal interpretation of color car, and other color signals of vehicles are carried out field sampling through car sampler U4B is arranged, and generation has the signal of other color cars; White car signal is arranged and have other color car signals having car signal combiner U4C to close the road, there is the car signal that the 8 pin output of car signal combiner U4C is being arranged, count value is less, but when reaching certain value, producing no car reset signal has car indicator U12 to having in the car indicator (7), and the reset signal that has car indicator U12 to produce not have other color cars has car sampler U4B to having in the car sampling circuit (8);
6.) vision signal is via row and field synchronization separation vessel U1 in row and the field synchronization separation circuit (13), isolate the 3 pin output of field signal by row and field synchronization separation vessel U1, the row signal is by the 5 pin output of row and field synchronization separation vessel U1, field signal is by the field sampler U9 in the field sampling generation circuit (14), field signal is taken a sample, and the sampled signal of this field signal passed in the car sampling circuit (8) car sampler U4B arranged, the field sampling of other color car signals is arranged;
7.) have car to close the road signal through the 8 pin output of car signal combiner U4C is arranged, regulate pulsewidth through the pulse-width modulator U3B in the pulse width modulation circuit (15), 5 pin of pulse-width modulator U3B produce low level, have lighted the car pilot lamp.
3. the vehicle that utilizes vision signal realization vehicle to cross the stop line pick-up unit as claimed in claim 2 is crossed the stop line detection method, it is characterized in that the method for vision signal processing and amplifying is:
1.) at first the vision signal that camera produces is carried out the signal processing and amplifying by video shunt (1);
2.) vision signal after amplifying is input to stop line signal decision device (2), and the high level line number in the vision signal is judged and amassed out corresponding white appliances riglet number by integrator (3);
3.) decision threshold is set up circuit (10) and is set up the dynamic decision thresholding that adapts with ambient light intensity;
4.) integrator (3) output signal is gone sampling by the capable signal of row and field synchronization separation circuit (13) generation at sample circuit (4);
5.) sample circuit (4) output signal is counted out white number of lines in the vision signal as counter (5) clock signal;
6.) counter (5) is when count value is big, and count value arrives white car signal interpretation circuit (12), expression adularescent car line ball; It is little that stop line code translator (6) translates count value, and when not reaching certain value, showing has other color car line balls, and producing has the car signal to enter car indicator (7); It is little but when reaching certain value, produce no car reset signal and entered car indicator (7) that stop line code translator (6) translates count value; Certain value is the white number of lines of stop line;
7.) vision signal is isolated field signal via row and field synchronization separation circuit (13), and field signal produces circuit (14) by the field sampling, and field signal is taken a sample;
8.) sampled signal is having car sampling circuit (8) sampling with the car signal that has that has car indicator (7) to produce, and generation at last has the signal of other color car line balls;
9.) adularescent car line ball signal closes the road with other color car line ball signals are arranged there being the car signal to close road (9), and producing has car line ball signal;
10.) there is car line ball signal to regulate pulsewidth, is presented on the pilot lamp at last by pulse width modulation circuit (15).
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2007100234273A CN100466009C (en) | 2007-06-01 | 2007-06-01 | Detecting device and method for realizing vehicle passing stop-line utilizing stop-line visual frequency signal |
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| CNB2007100234273A CN100466009C (en) | 2007-06-01 | 2007-06-01 | Detecting device and method for realizing vehicle passing stop-line utilizing stop-line visual frequency signal |
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| CN100466009C true CN100466009C (en) | 2009-03-04 |
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| KR101470240B1 (en) * | 2013-11-14 | 2014-12-08 | 현대자동차주식회사 | Parking area detecting apparatus and method thereof |
| CN106408526B (en) * | 2016-08-25 | 2019-02-12 | 南京邮电大学 | A kind of visibility detecting method based on multilayer polar plot |
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| CN2285921Y (en) * | 1996-11-18 | 1998-07-08 | 张民 | Automatic device for recording image of vehicle of running red light |
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