CN101707005A - Rapidly alarming system to signal light crossing congestion by video detection and operation method thereof - Google Patents
Rapidly alarming system to signal light crossing congestion by video detection and operation method thereof Download PDFInfo
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Abstract
The invention discloses a rapidly alarming system to signal light crossing congestion by video detection and an operation method thereof. The system comprises a video image acquisition device, a video detection processing unit and a traffic jam analyzing unit and the like which are arranged a plurality of meters away from a parking line, a detected lane, images of vehicles driving or queuing upon the lane and images of signal green lights of traffic stream of the lane can be acquired simultaneously; the video detection processing unit analyzes a preset detection area and a signal green light in the image, and outputs the condition of the current signal green light and the occupied condition of the detection area; and the traffic jam analyzing unit is provided with a traffic jam alarm signal output interface, presets queuing elimination period alarm valve value Ta, and monitors the occupied conditions of the detection area to Ta from the time that the green light lights up; if the detection area is always continuously occupied in the time interval, a traffic jam alarm signal is sent out.
Description
Technical field
The present invention relates to utilize video detection technology in a kind of urban traffic management, signal lamp control crossroad is being arranged, find traffic congestion and the system and the operation method thereof of reporting to the police fast.
Background technology
In the at present domestic and international city,, all need to utilize the current order of signal lamp standard junction machine motor-car at the crossing that traffic hazard takes place more greatly or often the magnitude of traffic flow.Along with expanding economy, motor vehicle quantity increases severely, and particularly in rush hour morning and evening, the crossing of many signal lamp controls has been in state of saturation.When causing traffic congestion, if untimely processing will spread to periphery rapidly, when serious even can cause the local traffic paralysis because of traffic accidents such as traffic hazard, vehicle trouble, traffic offence driving behaviors.How to find to have the traffic congestion of signal lamp control crossroad fast, become the focus that people pay close attention to.In the prior art that the world generally adopts, generally, all be to adopt video detection technology to find that crossing traffic blocks up at present.Utilize this method in the crossing that signal lamp control is arranged blocks up testing process,, still run into all-clear when finding that motor vehicle when the stop line at crossing is motionless, can't be confirmed to be because of meeting the red light orderly shutdown, because of a variety of causes impassable.Adopt popular detection mode at present, can only could confirm whether the crossing blocks up through after 2-3 signal period.The signal lamp cycle in general rush hour is all more than 90 seconds, so, find the time of fire alarming of the incident of blocking up, generally all minimumly be set in 180 seconds promptly more than 3 minutes.If when being set in below 3 minutes, can cause frequent wrong report, make the system can't operate as normal, therefore do not satisfy traffic-police's rapid-action demand far away.
Summary of the invention
Purpose of the present invention is intended to develop a kind of video detection technology that utilizes, and signal lamp control crossroad is being arranged, and realizes that traffic congestion finds the system that reports to the police fast.
System not only carries out Video Detection to the state that motor vehicle on the detected track takies road, also the green light phase of the signal lamp of the detected lane flow of letting pass is carried out Video Detection, the system that makes is utilized this two Video Detection output datas simultaneously, each green light in the phase algorithm by the traffic congestion analytic unit traffic congestion situation in detected track is analyzed quickly and accurately, send warning message by the alerting signal output interface immediately after finding to block up.
The video detection technology that utilizes provided by the invention finds have the system of signal lamp control crossroad traffic congestion to be achieved in that fast
Shown in Fig. 1 system topology figure, system is by 1. video image acquisition equipment; 2. Video Detection processing unit; 3. the traffic congestion analytic unit is formed, being arranged on apart from some meters behind the stop line. the position of video image acquisition equipment setting not only wants to collect detected track reaches the vehicle that travels or line up on the track image, also to be able to collect the image of the signal lamp green light of this lane flow of letting pass simultaneously. in the Video Detection processing unit, according to the video image that video image acquisition equipment is collected, set a certain zone on the detected track as detection zone; In image, specify the position of the signal lamp green light of the detected lane flow of letting pass simultaneously; The Video Detection processing unit has two outlet parameters, be green light phase testing result and road seizure condition testing result. then to preset a jam alarming threshold values Ta (length adds a suitable redundancy time for the checkout time of removing the maximum vehicle queue from stop line to detection zone) apart from the distance of stop line in the traffic congestion analytic unit, also be provided with a traffic jam warning signal output interface according to detection zone. the alert data of traffic jam warning signal output interface can pass through various communication modes (such as GPRS, telephone wire, the broadband, optical fiber etc.) be sent to control center.
After system powers on and starts working, the Video Detection processing unit begins continuous operation, the video image analysis of at first passing through to be obtained is calculated the image of specified in advance signal lamp green light position, thereby whether the signal lamp green light of judging this detected lane flow of letting pass opens bright, and by outlet parameter 1 output green light phase testing result, that 1 expression green light opens is bright, 0 expression green light extinguishes; And then analyze the image of the detection zone set, thus judge this moment, whether the track was taken by motor vehicle, and by outlet parameter 2 output road seizure condition testing results, 1 expression takies, 0 expression is vacant.
When outlet parameter 1 becomes 1 by 0, the green light in detected track of promptly letting pass opens when bright, the traffic congestion analytic unit brings into operation, per second operation 4 times is extinguished until green light and is ended, the occupancy of detection zone is monitored and added up, when the time that takies detection zone continuously reaches jam alarming threshold values Ta, system will send the jam alarming signal immediately.
Its ultimate principle is: the parking queuing of supposing a certain flow direction of a certain signal lamp control crossroad queues to or surpasses detection zone 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 detection zone, waiting for and move ahead, from the clearance green light open the bright vehicle of waiting for to detection zone leave detection zone 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, detection zone is taken all the time continuously, and the queuing vehicle that promptly is parked in detection zone 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 the traffic congestion analytic unit, preset a queuing removing phase alarming threshold value Ta (length adds a suitable redundancy time for the maximum queuing checkout time of this detection zone); The traffic congestion analytic unit opens to light from green light and brings into operation, the situation that takies continuously to detection zone 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, detection zone 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 detection zone all the time opening from green light to light in this time period of ending to Ta, if promptly think the generation traffic congestion.
Why traffic congestion analytic unit per second moves 4 times, is in order to shorten the real-time detection sampling interval to the wagon detector seizure condition, to improve accuracy of detection.
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 detection zone 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 detection zone 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.Therefore, the pairing queuing removing of different detection zones phase alarming threshold value Ta all should be passed through to calculate or measure and concrete setting according to factors such as detection zone position, condition of road surface by traffic engineer.
The operation method of traffic congestion Rapid Alarm provided by the present invention is:
(1) a default queuing removing phase alarming threshold value Ta in the traffic congestion analytic unit,
(2) open (when the outlet parameter 1 of Video Detection processing unit becomes 1 by 0) when bright when the signal lamp green light in this track of letting pass, initialize routine starts, with reference to flow process shown in Fig. 2, with alarm detection time window timer tq, detection zone take timer tc continuously, current jam alarming state ca is initialized as 0, the traffic congestion that brings into operation then analytic unit, per second 4 times is till green light extinguishes (outlet parameter 1 that is the Video Detection processing unit becomes at 0 o'clock by 1)
(3) with reference to flow process shown in Fig. 3, the traffic congestion analytic unit that the per second operation is 4 times, at first alarm detection time window timer tq is added 1, check the detection zone seizure condition of the outlet parameter 2 of Video Detection processing unit then, if detection zone occupiedly then took timer tc continuously with detection zone and added 1 this moment, if detection zone vacantly then took timer tc continuously with detection zone and was changed to 0 this moment
(4) judge that alarm detection time window timer tq whether less than 4* queuing removing phase alarming threshold value Ta, is then to forward the operation that (7) directly withdraw from this traffic congestion analytic unit to; Otherwise judge whether alarm detection time window timer tq equals 4* queuing removing phase alarming threshold value Ta, is then to illustrate to arrive queuing removing phase alarm detection decision-making constantly, forward (5) to, otherwise the queuing removing phase has been spent in explanation, forwards (7) to,
(5) check whether tc equals tq, be to illustrate that then detection zone is taken continuously in the alarm detection time window, current jam alarming state ca is changed to 1, otherwise be that explanation detection zone in the alarm detection time window is not taken continuously, current jam alarming state ca is changed to 0, then
(6) send current jam alarming state ca to the traffic jam warning signal output interface, then
(7) withdraw from the operation of this traffic congestion analytic unit.
Description of drawings
Fig. 1 is system topology figure
Fig. 2 is the initialize routine process flow diagram
Fig. 3 is a traffic congestion analytic unit process flow diagram
Embodiment
Suppose behind the stop line of a certain flow direction of a certain signal lamp control crossroad to be provided with native system, and will preset queuing removing phase alarming threshold value Ta=10 second.
When video detecting unit detects the signal lamp green light from extinguishing the state that changes Qi Liang into, outlet parameter 1 becomes 1 by 0, initialize routine at first takies timer tc continuously with alarm detection time window timer tq, the motor vehicle detecting district of traffic congestion routine analyzer, current jam alarming state ca is initialized as 0, the traffic congestion that brings into operation then analytic unit, per second 4 times.
Suppose to open from all-clear and light the 0th second to the 10th second detection zone and taken by the motor vehicle beginning all the time: this moment, the traffic congestion routine analyzer moved 4*10=40 time, and then tq equals 40, and tc also is 40; When judge alarm detection time window timer tq (=40) whether equal 4* queuing removing phase alarming threshold value Ta (=4*10=40) time, be, illustrate and arrive the alarm detection decision-making constantly, check whether tc (=40) equals tq (=40), be, explanation detection zone in the alarm detection time window is taken continuously, current jam alarming state ca is changed to 1, send current jam alarming state ca (=1) to the traffic jam warning signal output interface then, withdraw from this operation of this traffic congestion analytic unit 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.
Claims (4)
1. utilize Video Detection to the signal lamp intersection jam rapid alarm system, it is characterized in that:
(1) constitutes by video image acquisition equipment, Video Detection processing unit, traffic congestion analytic unit;
(2) video image acquisition equipment is arranged on some meters behind the stop line, and the position of setting wants to collect detected track simultaneously and the image of the image of the vehicle that travels or line up and the signal lamp green light of this lane flow of letting pass on the track;
(3) video image that collected according to video image acquisition equipment of Video Detection processing unit, set a certain zone on the detected track as detection zone, in image, specify simultaneously the position of the signal lamp green light of the detected lane flow of letting pass, to analyzing and road seizure condition testing result is exported green light phase testing result, outlet parameter 2 to the traffic congestion analytic unit in these two zones in the video image by outlet parameter 1;
(4) the traffic congestion analytic unit has a traffic jam warning signal output interface, default queuing removing phase alarming threshold value Ta, open when bright occupied condition monitoring to detection zone to Ta from green light, if during this section at interval in detection zone taken continuously all the time, promptly send the traffic jam warning signal.
2. the Video Detection of utilizing according to claim 1 is characterized in that the signal lamp intersection jam rapid alarm system: analysis and processing unit per second operation four times.
3. utilize the operation method of Video Detection, it is characterized in that the signal lamp intersection jam rapid alarm system:
(1) a default queuing removing phase alarming threshold value Ta,
(2) outlet parameter 1 of Video Detection processing unit becomes at 1 o'clock by 0, initialize routine starts: with alarm detection time window timer tq, detection zone take timer tc continuously, current jam alarming state ca is initialized as 0, the traffic congestion that brings into operation then analytic unit, outlet parameter 1 until the Video Detection processing unit becomes at 0 o'clock only by 1
(3) traffic congestion analysis: at first tq is added 1, check the detection zone seizure condition of the outlet parameter 2 of Video Detection processing unit 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 to forward (7) to withdraw from this routine analyzer, otherwise continuation judges whether tq equals Ta, be then to forward (5) to otherwise forward (7) to,
(5) checking whether tc equals tq, is then ca to be changed to 1 otherwise ca is changed to 0, then
(6) send current jam alarming state ca to the traffic jam warning signal output interface, then
(7) withdraw from this traffic congestion routine analyzer.
4. system operation method according to claim 3 is characterized in that:
(1) operation of traffic congestion analytic unit 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.
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| CN200910219697A CN101707005B (en) | 2009-11-05 | 2009-11-05 | Rapidly alarming system to signal light crossing congestion by video detection and operation method thereof |
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| CN104008648A (en) * | 2014-06-16 | 2014-08-27 | 北京易华录信息技术股份有限公司 | Jam triggering point monitoring system and method based on radar tracking technology |
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