CN101763726A - Quick and accurate traffic jam alarm and photograph system and operation method - Google Patents
Quick and accurate traffic jam alarm and photograph system and operation method Download PDFInfo
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- CN101763726A CN101763726A CN200910188051A CN200910188051A CN101763726A CN 101763726 A CN101763726 A CN 101763726A CN 200910188051 A CN200910188051 A CN 200910188051A CN 200910188051 A CN200910188051 A CN 200910188051A CN 101763726 A CN101763726 A CN 101763726A
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Abstract
The invention provides a quick and accurate traffic jam alarm and photograph system applied at the signal light control intersection and an operation method thereof. The system comprises a vehicle detector, image acquisition equipment and an analysis and processing unit which comprises a green signal light signal input interface in the green light direction of the traffic to be detected, a vehicle detector detection signal input interface and a traffic jam alarm signal output interface. The analysis and processing unit presets a queue elimination period alarm threshold Ta and a green light driving period alarm threshold Tb. The condition that the vehicle detector is employed is monitored for Ta from the moment the green light is on, if the vehicle detector is continuously employed all the time in the time interval, the traffic jam alarm signal is immediately sent out. The condition that the vehicle detector is employed is monitored after Ta until the green light is off, if the vehicle detector is continuously employed for not less than Tb in the time interval, the traffic jam alarm signal is immediately sent out. The image acquisition equipment is started to photograph the scene once every time the traffic jam alarm signal is sent out.
Description
Technical field
The present invention relates in a kind of urban traffic control the quick accurate alarm of the traffic congestion that signal lamp control crossroad is arranged, camera system and operation method thereof.
Background technology
In modern urban traffic management, all be to use to spread over the online wagon detector in urban road as the traffic detection means, detect the magnitude of traffic flow and the traffic congestion of road.
The traffic signal control system of widespread use at present both at home and abroad all has by vehicle the situation of occupying of wagon detector is calculated the function of current road traffic congestion degree, in view of the above and design generates the signal controlling preferred plan of following one-period or downstream road junction traffic flow.Along with expanding economy, motor vehicle quantity increases severely, and urban highway traffic has been in state of saturation, particularly in rush hour morning and evening.When traffic accident such as traffic hazard, vehicle trouble, traffic offence driving behavior takes place, if can not get handling timely, will cause road traffic and stop up and spread to periphery rapidly, when serious even can cause the local traffic paralysis.
Whistle control system can only calculate the road degree of crowding from the traffic overall trend in the prior art, for best state---the traffic congestion by the road traffic congestion that various accident caused, then can not find fast, quick accurate alarm.Normal traffic congestion can be predicted, and also can only alleviate as possible by some conventional traffic engineering means (as using advanced traffic signals control); Then different by traffic congestion that accident caused, since accident have multiple, spatial and temporal distributions is uncertain, and characteristics rapid to the current influence of normal traffic and that infringement property is big, therefore require traffic-police must accomplish quick discovery, fast processing, thereby avoid forming large-area traffic paralysis.Realize this goal, just must accomplish to find fast the field point that road traffic blocks up takes place, have only quick discovery, could fast processing.
No matter which kind of traffic jam warning system all is divided into three parts in workflow: the real-time collection of wagon detector seizure condition data, the data that collected are in real time carried out analyzing and processing, the crowded state that analyzes is sent warning.The patent of invention of " urban road traffic congestion detecting alarm system and operation method thereof " (patent No. is 200610047261.4), also just be based on above-mentioned principle, proposing a seizure condition information and be uploaded to control center in real time, carry out analyzing and processing, find to send after crowded the technical scheme of alarm by the process computer of control center with wagon detector on the road surface.The information that this method at first requires to upload is wagon detector seizure condition information, and next requires these information to be uploaded in real time.But in the existing all kinds of traffic signal control system, owing to working mechanism's difference, can satisfy the whistle control system of these two conditions, typical case's representative is exactly the SCOOT whistle control system; And for the traffic signal control system (for example SCAT whistle control system) of other most of types, perhaps the information of Cai Jiing be not wagon detector seizure condition information but such as information such as traffic statistics, perhaps the information of being gathered is not to upload in real time but after at interval certain cycle (for example 5 minutes) packing data is uploaded, and therefore just can't realize the quick accurate alarm of traffic congestion yet.
And, because the complicacy of road traffic, any traffic congestion detecting alarm system all exists the mutual choice problem between sensitivity and the accuracy, thereby high sensitivity requires the short detection affirmation cycle to cause accuracy rate to reduce, and then must need long detection to confirm that the cycle causes the sensitivity reduction thereby will improve accuracy.Which kind of traffic congestion fast detecting warning system that is to say, no matter can not reach 100% accuracy rate.Therefore, from the angle of traffic administration reality, confirm to block up and check that the reason of blocking up is necessary by image capture device collection site image.This affirmation work at present can only be to finish by the TV monitoring and controlling camera usually, quantity and limited coverage area, thus cause a lot of jam alarming information can't confirm and carry out cause investigation.
Summary of the invention
Purpose of the present invention is intended to develop and a kind ofly can be subjected to the whistle control system class limitations or even be free on quick accurate alarm of traffic congestion and camera system outside the whistle control system.This system can be packaged together wagon detector and detection signal analysis and processing unit and be arranged on the road, can each green light in the phase vehicle pass-through situation to this track analyze, send warning message by the alerting signal output interface immediately after finding to crowd, and start image capture device collection site image simultaneously, be uploaded to control center simultaneously with warning message.Quick accurate alarm of traffic congestion provided by the invention and camera system are achieved in that
The quick accurate alarm of traffic congestion, camera system, whether can open maximum queuing removing situation after bright or maximum queuing and remove the back wagon detector and occur again being taken continuously and report to the police and take pictures one of arbitrarily in the both of these case according to detecting green light, it comprises that one is arranged on the wagon detector on the detected traffic direction of the signal lamp control crossroad highway section, a detection signal analysis and processing unit and an image capture device.Wagon detector can be arranged on usually apart from some meters of stop line (for example 0-100 rice); Then preset a queuing removing phase alarming threshold value Ta apart from the distance of stop line in the analysis and processing unit according to wagon detector, also preset the green light phase alarming threshold value Tb that travels, signal lamp green modulating signal input interface and a wagon detector detection signal input interface of having the detected traffic direction of letting pass simultaneously, and a traffic jam warning signal output interface; Image capture device is connected with analysis and processing unit, and analysis and processing unit detects and starts image capture device immediately after the traffic congestion and taken pictures in the scene.The image scene that the alert data and the image capture device of traffic jam warning signal output interface obtained can be sent to control center by various communication modes (such as GPRS, telephone wire, broadband etc.).
The traffic congestion routine analyzer that moves on the analysis and processing unit opens at the green light that is connected to signal lamp green modulating signal input interface and to bring into operation when bright, per second 4 times, and green light stops after finishing.Why per second moves 4 times, is in order to shorten real-time detection sampling interval, the raising accuracy of detection to the wagon detector seizure condition.
The ultimate principle of said system is: the parking queuing of 1. supposing a certain flow direction of a certain signal lamp control crossroad queues to or surpasses wagon detector from stop line, so under the normal condition clearance green light open bright after, these queuing vehicles will start in turn and move ahead, also begin to start until the vehicle of on wagon detector, waiting for and move ahead, from the clearance green light open the bright vehicle of waiting for to wagon detector leave wagon detector required be called maximum queuing checkout time during this period of time.If a certain flow direction opens bright from the clearance green light, to through till maximum queuing checkout time and suitable redundancy time, wagon detector is taken all the time continuously, the queuing vehicle that promptly is parked on the wagon detector is not moving all the time, illustrates that this flow direction necessarily accident has taken place and caused traffic abnormity.According to this principle, at first in analysis and processing unit, preset a queuing removing phase alarming threshold value Ta (length adds a suitable redundancy time for the maximum queuing checkout time of this wagon detector); The traffic congestion routine analyzer opens to light from green light and brings into operation, the situation that takies continuously to wagon detector is monitored, light the queuing of setting and remove in this alarm detection time window that phase alarming threshold value Ta ends if open from green light, wagon detector is taken all the time continuously, then sends the warning message that traffic congestion takes place this flow direction immediately.Whether that is to say, set the purpose of queuing removing phase alarming threshold value Ta, be to detect to have certain chassis to take wagon detector all the time opening from green light to light in this time period of ending to Ta, if promptly think the generation traffic congestion.2. after having passed through queuing removing phase alarming threshold value Ta, the queuing of red interval is all emptied, and vehicle ' the place ahead or green light, this flow direction was in green light and travelled in the phase this moment, also should move ahead in turn even that is to say that vehicle is more, wagon detector also should be taken by intermittence, and in case a certain the vehicle commander's time that has occurred originally should not occurring in green light travels the phase takies the situation of wagon detector continuously, i.e. traffic abnormity has taken place at this moment in explanation.As seen, only the running state of the vehicle according to the queuing removing phase blocks up to judge and report to the police to be not enough, can't accomplish accurate alarm.Therefore, according to this principle, default green light phase alarming threshold value Tb that travels in analysis and processing unit at first; The traffic congestion routine analyzer is in the time period after queuing removing phase alarming threshold value Ta, the situation that takies to wagon detector is monitored, taken the green light that the meets or exceeds setting phase alarming threshold value Tb that travels continuously in case wagon detector occurs, also sent the warning message that traffic congestion takes place this flow direction immediately.That is to say, set the travel purpose of phase alarming threshold value Tb of green light, be to open bright Ta at green light to go out to green light after second in this time period, have vehicle to begin to take wagon detector rises and picks up counting at every turn, till this vehicle leaves wagon detector, stop timing, get congestion as long as timing length of appearance is promptly thought above the situation of Tb.
Usually, during the motor vehicles parking queuing, vehicle length add and front truck between spacing on average be about about 4 meters, the clearance green light open bright after, the checkout time of average every queuing vehicle is about 2 seconds, therefore being arranged on apart from 20 meters of stop line with wagon detector is example, fleet's length was 5 chassis when the row of fleet was full, required queuing checkout time is about 10 seconds, adds suitable redundancy time, and the removing phase alarming threshold value Ta that then lines up can be set at 15 seconds.Bright back wagon detector is still taken continuously and above 15 seconds, illustrate that then this highway section accident takes place causes traffic abnormity if the clearance green light of this direction opens, and should send warning message immediately.The green light phase alarming threshold value Tb that travels then should set according to the road conditions (whether slope etc. is for example arranged) and the vehicle condition (whether long vehicle or slow train etc. are for example arranged) of this flow direction.Therefore, the pairing queuing of each wagon detector remove phase alarming threshold value Ta and green light travel phase alarming threshold value Tb all should be by traffic engineer according to factors such as wagon detector position, condition of road surface by calculating or measuring and concrete the setting.
The operation method of the quick accurate alarm of traffic congestion provided by the present invention is:
(1) a default queuing removing phase alarming threshold value Ta and the green light phase alarming threshold value Tb that travels in analysis and processing unit,
(2) when detecting the signal lamp green light, signal lamp green modulating signal input interface changes Qi Liangshi into from extinguishing, initialize routine starts, with reference to flow process shown in Fig. 1, alarm detection time window timer tq with the traffic congestion routine analyzer, wagon detector takies timer tc continuously, current jam alarming state ca, the sign ra that taken pictures is initialized as 0, the traffic congestion that brings into operation then analysis module, per second 4 times, until signal lamp green modulating signal input interface detect the signal lamp green light from open bright change into extinguish till
(3) with reference to flow process shown in Fig. 2, the traffic congestion routine analyzer that the per second operation is 4 times, at first alarm detection time window timer tq is added 1, the wagon detector seizure condition of detecting device detection signal input interface then checks vehicles, if wagon detector occupiedly then took timer tc continuously with wagon detector and added 1 this moment, if wagon detector free time this moment then takies timer tc continuously with wagon detector and is changed to 0
(4) judge that alarm detection time window timer tq whether less than 4* queuing removing phase alarming threshold value Ta, is then to forward (9) to directly to withdraw from this traffic congestion routine analyzer; Otherwise judge whether alarm detection time window timer tq equals 4* queuing removing phase alarming threshold value Ta, be then to illustrate to arrive queuing removing phase alarm detection decision-making constantly, forward (5) to, otherwise explanation has been spent the queuing removing phase and is in green light and travels the phase, forward (6) to
(5) check whether tc equals tq, be to illustrate that then wagon detector is taken continuously in the alarm detection time window, current jam alarming state ca is changed to 1, otherwise be that explanation wagon detector in the alarm detection time window is not taken continuously, current jam alarming state ca is changed to 0, then tc is changed to 0 in order to follow-up green light travel phase accumulative total wagon detector take continuously situation with and forward (7) to and send current jam alarming state ca to the traffic jam warning signal output interface
(6) judge tc whether more than or equal to the 4* green light phase alarming threshold value Tb that travels, do not taken continuously above the travel situation of phase alarming threshold value of green light, forward (9) to and directly withdraw from this traffic congestion and analyze journey otherwise wagon detector appears at present in explanation as yet; Be to illustrate that then having occurred wagon detector in green light travels the phase is taken continuously above the travel situation of phase alarming threshold value of green light, is changed to 1 with current jam alarming state ca, then
(7) send current jam alarming state ca to the traffic jam warning signal output interface, then
(8) judge whether current jam alarming state ca be 1 and taken pictures the sign ra be 0, otherwise directly forward (9) to, be then to start image capture device to be taken pictures in the scene, and the sign ra that will take pictures is changed to 1, thereby only to the first time jam alarming scene take pictures once, when in the cycle traffic congestion taking place, same green light takes pictures repeatedly avoiding, then
(9) withdraw from the operation of this traffic congestion routine analyzer.
Description of drawings
Fig. 1 is the initialize routine process flow diagram
Fig. 2 is a traffic congestion routine analyzer process flow diagram
Embodiment
Suppose that 20 meters are provided with wagon detector behind the stop line of a certain flow direction of a certain signal lamp control crossroad, and default the queuing removing phase alarming threshold value Ta=15 second, green light travels phase alarming threshold value Tb=9 second.
When detecting the signal lamp green light, signal lamp green modulating signal input interface changes Qi Liangshi into from extinguishing, with alarm detection time window timer tq, the wagon detector of traffic congestion routine analyzer take timer tc continuously, current jam alarming state ca is initialized as 0, the traffic congestion that brings into operation then routine analyzer, per second 4 times.
Suppose and open from green light that to light the 0th second to the 15th second wagon detector occupied all the time: this moment, the traffic congestion routine analyzer moved 4*15=60 time, and then tq equals 60, and tc also is 60; When judge alarm detection time window timer tq (=60) whether equal 4* queuing removing phase alarming threshold value Ta (=4*15=60) time, be, illustrate and arrive the alarm detection decision-making constantly, check whether tc (=60) equals tq (=60), be, explanation wagon detector in the alarm detection time window is taken continuously, current jam alarming state ca is changed to 1, tc is changed to 0 to be taken situation continuously and uses in order to the follow-up green light phase accumulative total wagon detector that travels, send current jam alarming state ca (=1) to the traffic jam warning signal output interface then, withdraw from this operation of this traffic congestion routine analyzer then.The current jam alarming state ca (=1) that the traffic jam warning signal output interface sends can be sent to control center by the local communication circuit.
Suppose again to open to light the 0th second to the 15th second wagon detector accumulative total and have 6 sampling interval (1/4 second) unoccupied that have 54 sampling interval occupied: this moment, the traffic congestion routine analyzer moved 4*15=60 time, and then tq equals 60, and tc is 54 from green light; When judge alarm detection time window timer tq (=60) whether equal 4* queuing removing phase alarming threshold value Ta (=4*15=60) time, be, illustrate and arrive the alarm detection decision-making constantly, check whether tc (=54) equals tq (=60), not, explanation wagon detector in the alarm detection time window is not taken continuously, current jam alarming state ca is changed to 0, send current jam alarming state ca (=0) to the traffic jam warning signal output interface then, withdraw from the operation of this traffic congestion routine analyzer then.
Suppose that more present green light opened bright 38 seconds, and wagon detector was taken continuously during these 9 seconds from the 30th second to the 38th second: this moment, the traffic congestion routine analyzer moved 4*38=152 time, then tq equals 152, and wagon detector has been taken 9 seconds then tc=4*9=36 continuously; Tq greater than 4*Ta (=4*15=60), illustrate that being in green light now travelled in the phase, judge that then whether tc (=36) is more than or equal to 4*Tb=4*9=36, be, explanation wagon detector occurred and has been taken the travel situation of phase alarming threshold value Tb of green light that meets or exceeds continuously in green light travels the phase, current jam alarming state ca is changed to 1, and sends current jam alarming state ca (=1), withdraw from the operation of this traffic congestion routine analyzer then to the traffic jam warning signal output interface.
Claims (6)
1. the quick accurate alarm of traffic congestion, camera system is characterized in that:
(1) by wagon detector and be attached thereto detection signal analysis and processing unit and an image capture device that is connected with analysis and processing unit of connecing and constitute,
(2) wagon detector is arranged on the detected traffic direction highway section of signal lamp control crossroad,
(3) analysis and processing unit has signal lamp green modulating signal input interface, a wagon detector detection signal input interface, traffic jam warning signal output interface of the detected traffic direction of letting pass, analysis and processing unit default queuing removing phase alarming threshold value Ta and the green light phase alarming threshold value Tb that travels
A, open the occupied condition monitoring that lights wagon detector to Ta from green light, if during this section at interval in wagon detector taken continuously all the time, promptly send the traffic jam warning signal,
B, occupied condition monitoring to the green light to wagon detector after Ta go out, and at interval interior wagon detector occurs promptly being sent the traffic jam warning signal by duration of occupancy 〉=Tb during as if this section,
(4) analysis and processing unit detects and starts image capture device immediately after the traffic congestion and taken pictures in the scene.
2. the quick accurate alarm of traffic congestion according to claim 1, camera system is characterized in that: analysis and processing unit per second operation four times.
3. the quick accurate alarm of traffic congestion according to claim 1 and 2, camera system is characterized in that: wagon detector is arranged on some meters behind the stop line.
4. the quick accurate alarm of traffic congestion according to claim 1 and 2, camera system is characterized in that: wagon detector and detection signal analysis and processing unit are packaged as a whole.
5. the quick accurate alarm of traffic congestion, camera system operation method is characterized in that:
(1) a default queuing removing phase alarming threshold value Ta and green light phase alarming threshold value Tb that travels,
(2) extinguish from green light and change Qi Liangshi into when signal lamp green modulating signal input interface detects signal lamp, start initialize routine, with alarm detection time window timer tq, wagon detector take continuously timer tc, current jam alarming state ca, take pictures the sign ra all be initialized as 0, begin the traffic congestion analysis then, only extinguish from opening bright becoming until detecting the signal lamp green light
(3) traffic congestion analysis: at first tq is added 1, the wagon detector seizure condition of the detecting device detection signal input interface that checks vehicles then, if occupiedly then tc is added 1 this moment, if unoccupiedly then tc is changed to 0 this moment,
(4) determine whether to arrive queuing removing phase alarm detection decision-making constantly: whether judging tq less than Ta, is then directly to withdraw from this routine analyzer, otherwise continuation judges whether tq equals Ta, be then to forward (5) to otherwise forward (6) to,
(5) checking whether tc equals tq, is then ca to be changed to 1 otherwise ca is changed to 0, then tc is changed to 0 and forward (7) to,
(6) analyze and wagon detector whether to occur and taken continuously above the green light phase alarming threshold value situation of travelling: whether judging tc more than or equal to Tb, otherwise directly withdraw from this routine analyzer, is then ca to be changed to 1, then
(7) send current jam alarming state ca to the traffic jam warning signal output interface, then
(8) judge whether current jam alarming state ca be 1 and the sign ra that taken pictures be 0, otherwise directly forward (9) to, be then to start image capture device to be taken pictures in the scene, and the sign ra that will take pictures is changed to 1, then
(9) withdraw from this traffic congestion routine analyzer.
6. system operation method according to claim 4 is characterized in that:
(1) operation of traffic congestion routine analyzer per second is four times,
(2) determining whether to arrive queuing removing phase alarm detection decision-making constantly in the step, compare, judge with tq and 4*Ta,
(3) wagon detector whether occurs and taken continuously in the phase alarming threshold value situation step of travelling above green light analyzing, to compare, judge with tc and 4*Tb.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110853348A (en) * | 2019-10-23 | 2020-02-28 | 北京文安智能技术股份有限公司 | Control method, device and system of solar camera |
| CN116580567A (en) * | 2023-07-13 | 2023-08-11 | 深圳市博昌智控科技有限公司 | Road congestion cause acquisition method, system and equipment based on intelligent traffic light |
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2009
- 2009-10-22 CN CN200910188051A patent/CN101763726A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110853348A (en) * | 2019-10-23 | 2020-02-28 | 北京文安智能技术股份有限公司 | Control method, device and system of solar camera |
| CN116580567A (en) * | 2023-07-13 | 2023-08-11 | 深圳市博昌智控科技有限公司 | Road congestion cause acquisition method, system and equipment based on intelligent traffic light |
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Open date: 20100630 |