CN101807346B - Automatic license plate identification system at urban checkpoint - Google Patents
Automatic license plate identification system at urban checkpoint Download PDFInfo
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- CN101807346B CN101807346B CN2009100777461A CN200910077746A CN101807346B CN 101807346 B CN101807346 B CN 101807346B CN 2009100777461 A CN2009100777461 A CN 2009100777461A CN 200910077746 A CN200910077746 A CN 200910077746A CN 101807346 B CN101807346 B CN 101807346B
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Abstract
The invention relates to an automatic license plate identification system at an urban checkpoint, which belongs to the field of monitoring and comprises a coil assembly, a vehicle detection module, a license plate identification module, a front-end module and a network transmission module, wherein the coil assembly is connected to the vehicle detection module, and coils generate a pulse signal when a vehicle passes through the urban checkpoint; the vehicle detection module detects the coils and transmits the received pulse signal to the license plate identification module; the license plate identification module captures a video image transmitted by the front-end module when the license plate identification module receives the pulse signal, finishes the entire video image processing process of the identification of a license plate, and uploads a processing result by a network; the front-end module carries out synchronous exposure, synchronous supplemental lighting and shooting on a camera under the control of a vehicle identification module and transmits the video image to the license plate identification module; and the network transmission module uploads the data of the license plate and the vehicle to a data centre. The system integrates most of the functions in the candid identification of the license plate at the checkpoint by adopting integrated design, reduces the system maintenance difficulty caused by the complexity of the system greatly, enhances the entire stability and reliability of the system, and lowers the maintenance cost of the system.
Description
Technical field
The invention belongs to the monitoring field, relate to a kind of automatic recognition system, particularly a kind of automatic license plate identification system at urban checkpoint.
Background technology
Along with rapid economy development, the recoverable amount rapid growth of China's automobile, the traffic offence phenomenon also greatly increases; Government's traffic control and public security department more and more pay attention to the motor vehicles in the city of coming in and going out are effectively managed; The urban public security bayonet socket is the discrepancy artery in city, strengthens the traffic administration of traffic control department is effectively assisted in the management of bayonet socket, like hypervelocity, cover board etc.; Assist the detection of public security organ's case, steal like vehicle rob, vehicle hit-and-run etc.
The general system architecture that adopts of present stage city bayonet socket car plate capturing system is as shown in Figure 1; Detect passing through of vehicle by vehicle detection unit 101 through modes such as infrared, coil, radar or laser in this system;, triggers by vehicle the vision signal that car plate recognition unit 102 grasps cameras 103 outputs when passing through; Thereby carry out the car plate data that vehicle is obtained in certain detection through 102 pairs of images that obtain of car plate recognition unit; Upload to PC 105 then; Traffic control department and public security department realize evidence obtaining and punishment to vehicles peccancy through contrast and the inquiry to back-end data, capture because this system will accomplish round-the-clock 24 hours car plate, under night or the ungratified situation of light condition, must carry out light compensation through the 104 pairs of trafficks in LED light filling unit.
But implement to exist following problem in reality:
The city Gate System is a relative complex and the huge system of engineering; The device category that wherein relates to is various; Generally the equipment of being purchased is integrated and installed through integrator; The equipment of each manufacturer production also has nothing in common with each other, and wherein is no lack of special function that each producer provides because the problem that merges each other causes and can't realize.And manufacturer's product quality is uneven; Maybe be because the problem of certain equipment causes the paralysis of total system; Integrator is difficult in and holds system design on the whole, and this brings very big hidden danger for the normal operation of equipment, can increase the maintenance cost in later stage simultaneously greatly.
The mode of vehicle detection is many, and relatively more commonly used is that video triggers and coil triggers, and video triggers simple to project installation; And do not have the destructive construction of road pavement, but for the speed of a motor vehicle, pavement texture and illumination condition certain limitation is arranged, and have bigger false triggering rate; The damaging construction of coil triggering mode road pavement is buried the road surface cutting underground coil, and its toggle rate is higher relatively; The illumination and the speed of a motor vehicle all there are not harsh requirement, if but the vehicle identification equipment in the Gate System of city adopts the coil triggering mode, and coil is embedded under the pavement of road; The vehicle that leads to rolling day and night caused damage to coil, when accumulating over a long period, when coil breaks down; Can't the perception vehicle pass through, thus can't capture and collect the car plate data.And because the limitation of equipment operation and the consideration of construction cost, the equipment in the Gate System of city is to be operated in the road next door greatly, and is unattended, is easy to stolen.
The urban public security bayonet socket requires 24 hours round-the-clock vehicles to each process to capture, discern; Because urban public security bayonet socket infield light at general night is more dim; The big lantern festival of adding the night running vehicle influences common camera; Make it to produce halation and can't clap clear car plate, can't get access to the car plate data in this case.
Because the city bayonet socket is away from the urban district; And car plate picture, vehicle pictures and relevant data such as speed are arranged in the vehicle data; Must adopt the active data transmission mode to transmit at a distance could will be that data upload is to command centre or service centre, if network anomaly causes the interruption of data link; Data can't be uploaded, and might cause losing of data.
Because car plate identification have higher requirement to captured image slices, generally requires car plate accounting for more than 1/6 of image, the width in track is generally about 3m; Existing SD video camera probably can be taken a track, if require higher car plate discrimination, the pixel of car plate is high more good more in the image; Under the situation that guarantees discrimination, the clear video camera of a station symbol can only cover a track, therefore; If three tracks are arranged on the direction; Must use 5 video cameras could realize seamless covering,, between each track, must increase a coil again if adopt coil to trigger.On the one hand since wagon detector to the laying width of coil, highly, also have very strict requirement all arranged at interval, too closely will cause crosstalking each other between the coil if adjacent windings is laid, influence vehicle detection sensitivity and reliability; On the other hand, the laying meeting road pavement of coil has certain destruction, if laying density is excessive; Will road pavement cause very big damage; Influence the serviceable life on road surface, because pavement damage is overweight, it is out of shape day by day and coil is caused damage simultaneously.Therefore how to realize under the pattern that adopts coil to trigger that it is individual relatively stubborn problem that multilane covers always.
Summary of the invention
The present invention provides a kind of automatic license plate identification system that is applicable to the city bayonet socket, combines based on video and coil triggering, and the car plate capturing system of burglar alarm and fault alarm function is provided simultaneously.
A kind of automatic license plate identification system at urban checkpoint of the present invention comprises:
Coil groups is connected to the vehicle detection module, when vehicle produces pulse signal through out-of-date coil;
The vehicle detection module is used for the magnetic test coil group, and the pulse signal that receives is sent to the car plate identification module;
The car plate identification module is used for when receiving pulse signal, grasping the video image that front-end module sends over, and accomplishes the video image processing procedure to whole car plate identification, and through network upload process result; And, receive the failure alarm signal that is sent when coil breaks down from the vehicle detection module, automatically switch to the video trigger mode; Simultaneously this failure alarm signal is uploaded to data center through network transmission module, and is main with the car plate triggering, it is auxilliary triggering based on background; Carry out logic determines from triggered time and space; Trigger and grasp video image, accomplish video image processing procedure whole car plate identification, and through network upload process result;
Front-end module is used under the control of vehicle identification module the synchronous exposure of video camera and light filling, capture video image simultaneously, and with transmission of video images to the car plate identification module;
Network transmission module is used for car plate and vehicle data are uploaded to data center.
Said front-end module comprises a plurality of front end systems, front end system of each lane configurations; Front end system comprises: video camera is used to take the vehicle image that comprises the car plate video image; LED light filling unit is used under the situation of insufficient light, realizes the light filling to camera; Lock unit is used to make all video cameras on the same direction to take simultaneously, and makes all LED light filling unit matching video cameras light fillings simultaneously.
Said front end system also comprises communication unit, is used for converting the control signal that the car plate identification module sends over RS485 signal format into the TTL serial data, is used for controlling video camera and lock unit.
Vision signal under video camera will be taken sends the car plate identification module to; The car plate identification module carries out Luminance Analysis to vision signal; And compare with the parameter of configuration, aperture, shutter and the gain of controlling video camera in view of the above reach the adjusting luminance video, send instruction if brightness reaches the benchmark that needs light filling and give lock unit; Open LED light filling unit and carry out light filling, otherwise close LED light filling unit.
Said lock unit comprises synchronous control unit and synchronous configuration, and synchronous configuration is used for the method for synchronization of configuration synchronization control module; When the method for synchronization was internal synchronization mode, synchronous control unit produced synchronous clock actuated camera and the work of LED light filling units synchronization.
When the method for synchronization was external sync mode, said lock unit also comprised outer sync cap, and outside synchronous clock line inserts synchronous control unit through outer sync cap, makes equidirectional with all video cameras on the section and the work of LED light filling units synchronization.
When the method for synchronization was the power supply method of synchronization, said lock unit also comprised the power supply synchronous detection unit, and the 50Hz power frequency component during its 220V AC power that detects front end system is imported comes all video camera and LED light filling unit synchronously through this signal.
The vehicle detection module comprises: wagon detector is used for the magnetic test coil group, as the vehicle pulse signal that receiving coil produces during through coil and send the vehicle checker control module to; The vehicle checker control module is used for pulse signal is sent to vehicle identification module, and the state and the pulse signal of wagon detector carried out logic analysis and control, when wagon detector or coil break down or failure alarm signal occurs sending when unusual.
The car plate identification module comprises a plurality of vehicle identification cards, and the number of vehicle identification card is configured according to number of lanes, and each vehicle identification card comprises: image acquisition units is used for from front end system collection vehicle image; Graphics processing unit is used for accomplishing car plate location and car plate identification according to the vehicle image that collects; Trigger logic control element, be used to accomplish the control interface that links to each other with the vehicle detection module, realize that vehicle triggers the control of logic, the signal that transmits according to the vehicle detection module produces trigger pip and offers the unit that tests the speed; The unit that tests the speed is used for trigger pip is analyzed, and converts velocity information into; The network communication unit is used to realize and the information interaction of vehicle detection module, transmits the data that comprise car plate locating information, car plate identifying information, velocity information and fault alarm information to network transmission module; Dsp processor is used for controlling the operation of each unit of vehicle identification card.
Said each vehicle identification card also comprises: the front-end control interface, be used for the front end system communication to accomplish control to video camera and LED light filling unit; The real-time clock unit is used to whole car plate identification card and is provided, calendar when obtaining vehicle snapshot and temporal information reference time; Data buffer storage unit is used for when network occurs can't transmitting data unusually, and is data cached, after network communication recovers, uploads data again; Watchdog circuit; Be used for detecting each unit of vehicle identification card, this circuit can automatically reset at once and restart when appearance is unusual, and this circuit has the timing reset function simultaneously; The setting fixed interval time lets system reset or appointed interval after several days, resets at a fixed time.
Described network transmission module comprises:
The network switch, be used for realizing a plurality of car plate identification modules cascade and with being connected of the bayonet socket computer at system place; Optical transmission device, the bayonet socket that is used for belonging to when system is accomplished safe remote data communication through optical fiber when data center is far away.
In the said system; Front-end module also is used to carry out video image acquisition, and when launching the video trigger mode, the car plate identification module is used for that also car plate is carried out in the zone of each the two field picture appointment that collects and detects; Detect based on background simultaneously, detect moving object wherein; If detect car plate, then control front-end module and capture, upgrade background, continue to gather video image; If do not detect car plate, background does not detect moving object in detecting yet, and then upgrades background, continues to gather video image; If do not detect car plate, background detects moving object in detecting, and triggers candid photograph in the N frame recently, then controls front-end module and captures, and upgrades background, continues to gather video image.
Repertoire in the bayonet socket car plate candid photograph identification that the present invention's this invention simultaneously is almost integrated; Adopt integrated design; As long as the user is according to track situation and this system of needs reasonable configuration; Significantly reduced since the complicacy band of system the system maintenance difficulty, improved stability and the reliability of entire system, reduced cost of system maintenance.And the system state measuring ability is provided; Trigger and the video triggering mode in conjunction with coil; When coil breaks down; Be transformed into the video trigger mode from the coil trigger mode, guaranteed under the situation of coil fault, still can realize the candid photograph and the identification of car plate, when breaking down or for example illegally unpacking abnormal conditions occur, long-range fault alarm information will be provided simultaneously; The present invention also provides multiple synchronous light filling pattern, has guaranteed to capture required brightness, has designed mechanism with an automatic light meter among the present invention simultaneously, prevents the problem that can't clap clear car plate that halation, frontlighting, backlight cause, and realizes vehicle snapshot identification in round-the-clock 24 hours; Car plate identification module among the present invention adopts separate design; A plurality of identification cards are arranged in the identification module; Come this system of reasonable configuration according to the quantity in track, keep relative independence between each identification card, the fault of an identification card can not have influence on other lane identification; Suspension many days, illegal power down or shutdown simultaneously, designed data buffer storage unit among the present invention, even if can not cause losing of data; The present invention also adopts the technology of virtual coil, carries out logic analysis according to the output of adjacent lane, realize the seamless covering of multilane, significantly reduced the coil number that will lay.
Description of drawings
Fig. 1 shows the city bayonet socket car plate capturing system of prior art;
Fig. 2 shows the structured flowchart according to automatic license plate identification system at urban checkpoint of the present invention;
Fig. 3 shows when the synoptic diagram of car through out-of-date coil, wagon detector and the vehicle checker control module course of work;
Fig. 4 shows the structural representation of front end system;
Fig. 5 shows the structural representation of car plate identification card;
Fig. 6 shows the process flow figure based on video triggers and the coil triggering combines
Fig. 7 shows the synoptic diagram in virtual coil track when the vehicle cross-line goes;
Fig. 8 shows based on the video of car plate and triggers and trigger the process flow figure that combines based on the video of background;
Fig. 9 shows a kind of application implementation example of the present invention in the bayonet socket of city;
Among the figure, 101, vehicle detection unit 102, car plate recognition unit 103, camera 104, LED light filling unit 105, PC 200, coil groups 201, wagon detector 202, vehicle checker control module 203, car plate identification module 204, front-end module 205, network transmission module 206, vehicle detection module 401, video camera 402, LED light filling unit 403, lock unit 404, communication unit 405, control module 406, dispensing unit 407, outer sync cap 408, power supply synchronous detection unit 501, dsp processor 502, image acquisition units 503, graphics processing unit 504, the unit 505 that tests the speed, network communication unit 506, front-end control interface 507, trigger logic control element 508, real-time clock unit 509, data buffer storage unit 510, watchdog circuit
Embodiment
For practical implementation process of the present invention better is described; Explain below in conjunction with accompanying drawing; As shown in Figure 2; Be a kind of automatic license plate identification system that is used for city bayonet socket or public security bayonet socket, this system comprises: coil groups 200, vehicle detection module 206, car plate identification module 203, front-end module 204, the network transmission module 205 be made up of wagon detector 201 and vehicle checker control module 202; Wherein, coil groups 200 comprises some cover coils: coil 1, coil 2...... coil N, every cover coil are divided into velocity coils and capture coil; Velocity coils is used for testing the speed; Capture coil and be used for capturing picture, the corresponding cover coil in per car road, every cover coil disposes according to the needs coil tests the speed.Test the speed if desired, then every cover comprises velocity coils and captures coil, otherwise only coil is captured in configuration.Front-end module 204 comprises a plurality of front end systems, front end system 1, front end system 2...... front end system N.Each lane configurations one front end system, take if desired vehicle through the time whole road surface and car load image data, then also need increase a front end system that pans, for each track on equidirectional provides panoramic picture.In the vehicle detection module 206; 202 pairs of wagon detectors 201 of vehicle checker control module are controlled; The simulating signal that wagon detector 201 receiving coil groups 200 pass over also detects it; And these testing results are delivered in the car plate identification module 203 through vehicle checker control module 202, a plurality of car plate identification cards are arranged in the car plate identification module 203, data message is discerned in each identification card; Data upload after the identification is to network transmission module 205.Network transmission module 205 comprises the optical communication unit and the network switch, and the car plate identification card in each track all is connected in collection on the network switch in the car plate identification module 203, upload the data to the data center of bayonet socket again through the network switch; If bayonet socket is far away from data center, just need between network transmission module 205 and data center, set up the optical communication unit, upload the data to data center through optical fiber.
The course of work of wagon detector in the vehicle detection module 206 201 and vehicle checker control module 202 is described below in conjunction with Fig. 3: both are used for the magnetic test coil state variation, and the pulse signal that receives is sent to car plate identification module 203.Automobile goes from the direction of advancing; During along a certain cover velocity coils in the process coil groups 200 and candid photograph coil; Can cause the variation of coil flux amount; Wagon detector detects two pulses that produce as scheme through the variation to magnetic flux: pulse a and pulse b; Wagon detector 201 passes to vehicle checker control module 202 with this pulse signal, and the vehicle checker control module is carried out logic analysis to the pulse in the track that links to each other, and two pulse signals that will belong to same track send to corresponding car plate identification module 203.Car plate identification module 203 just can calculate the speed v of vehicle through this position according to the interval δ t and the interval δ l between velocity coils and the candid photograph coil that calculate between two pulses again:
By Fig. 2 and shown in Figure 3; In the front-end module 204; The camera of the front end system in corresponding track is aimed at the position at corresponding candid photograph coil place, and when car was captured coil through this, pulse b will trigger car plate identification module 203; Car plate identification module 203 obtains the video image that front-end module 204 transmits and carries out the candid photograph of car plate, and car plate identification module 203 carries out the identification of car plate according to the image of capturing.If candid photograph coil or velocity coils break down in this cover coil of corresponding coil groups 200; Like winding coil disconnection in the coil etc.; 201 of wagon detectors can detect this fault and failure message is passed to vehicle checker control module 202; Vehicle checker control module 202 can be to the alerting signal in the corresponding track of car plate identification module 203 transmissions after obtaining this failure message, and car plate identification module 203 carries out corresponding action according to this alerting signal.
As shown in Figure 4, front-end module 204 is used under the control of vehicle identification module 203, accomplishing the vehicle image that also will capture vehicle snapshot and is sent to car plate identification module 203.One cover front end system comprises video camera 401, LED light filling unit 402, lock unit 403 (shown in dotted line) and communication unit 404.Lock unit 403 comprises control module 405, dispensing unit 406, outer sync cap 407 and power supply synchronous detection unit 408.Video camera 401 is used to take the car plate video image; The light filling to video camera 401 is realized in LED light filling unit 402 under the situation of insufficient light; Lock unit 403 is used to make all video cameras on the same direction to take simultaneously, and makes all LED light filling unit matching video cameras light fillings simultaneously.
The present invention realizes that not only video camera and light filling are synchronous, and realizes that each track corresponding video camera and light filling lamp are all synchronous, so just can make phase complementary light between the adjacent lane, reaches the effect of enhancing light filling effect.For this reason, 3 kinds of methods of synchronization of design among the present invention: inter-sync, outer synchronously and power supply synchronous; System configuration that these three kinds of methods of synchronization are corresponding different: if do not require the direct phase complementary light of adjacent lane in being provided with of this system, just select internal synchronization mode for use, adjacent lane phase complementary light if desired, then select for use synchronously outer or power supply synchronous.A kind of concrete embodiment such as Fig. 4, lock unit 403 comprise control module 405 and dispensing unit 406, and sync cap 407 outside in external sync mode, also needing also needs power supply synchronous detection unit 408 in the power supply method of synchronization.
The selection of the method for synchronization realizes through the configuration to system, if the configuration information of dispensing unit 406 outputs is inter-sync, and then video camera 401 and LED light filling unit 402 synchronous working under the sequential clock that control module 405 produces drives; If the configuration information that dispensing unit 406 is exported is synchronously outer, then need outside extra synchronous clock line through outer sync cap 407 Access Control unit 405, make equidirectional with all video cameras on the section and LED light filling unit while synchronous working; If the configuration information of dispensing unit 406 outputs is the power supply method of synchronization; The zero line of the 220V AC power input of the front end system that then requirement need be synchronous is consistent with the live wire access, detects the 50Hz power frequency component in the 220V interchange through the power supply synchronous detection unit in the front end system 408, and this signal is transferred to control module 405; All video cameras and LED light filling unit are carried out synchronously; This mode does not need extra line synchro, installs succinctly, and construction is simple.
Regardless of being to adopt which kind of method of synchronization, LED light filling unit 402 all is under the synchronizing clock signals control that corresponding control unit 405 is produced, to carry out stroboscopic exposure and shooting with the frequency of 25 frame/seconds with video camera 401, and each field picture is all made public.Therefore can find out; Use under the inter-sync mode; Have only the video camera 401 in the same front end system to take with LED light filling unit 402 synchronous stroboscopics, when adopting outer synchronous or power supply synchronous, all video cameras on this section and LED light filling lamp be the while stroboscopic all; Take simultaneously, strengthened the light filling effect so greatly.
Car plate identification module 203 is used for when receiving pulse signal, grasps the vision signal that each front end system sends and carries out the candid photograph of vehicle; And receive the vehicle image of capturing and analyze from front-end module 204, obtain car plate and vehicle data and be sent to network transmission module 205.Car plate identification module 203 contains a plurality of car plate identification cards; The number of car plate identification card is configured according to concrete number of track-lines; A car plate identification card comprises dsp processor 501, image acquisition units 502, graphics processing unit 503, the unit 504 that tests the speed, network communication unit 505, front-end control interface 506, triggers logic control element 507, real-time clock unit 508, data buffer storage unit 509 and watchdog circuit 510, and is as shown in Figure 5.
The car plate identification card is a core with dsp processor 501, and each unit is connected in this dsp processor 501 and the identification card, is used to control the operation of each unit.Image acquisition units 502 is responsible for the video acquisitions to panoramic picture and characteristic image, and panoramic video partly is used for the panoramic picture of monitoring vehicle through this bayonet socket, writes down the car load information that vehicle body, car looks and Che Se are provided for this group vehicle pass-through; Feature video partly is used for grasping license plate image, and for car plate identification provides license board information, this unit is gathered image with the frequency of per second 25 frames.The Flame Image Process that graphics processing unit 503 is accomplished feature video comprises the processing such as retrieval, car plate location, car plate identification, video triggering and photometry analysis of car plate, after grabbing car plate, panorama and characteristic picture is carried out JPEG compression and image overlay.Test the speed unit 504 is responsible for trigger pip is analyzed, and converts velocity information into.Trigger logic control element 507 and be responsible for the signals (for example, pulse a and b) of vehicle checker control module 202 transmission are isolated conversion, and the state of coil is detected, provide trigger pip to testing the speed unit and the coil fault alerting signal is provided.Photometry analysis and the comparison of light modulation benchmark that front-end control interface 506 is made according to graphics processing unit 503 are sent control signal so that front end system 204 is carried out brightness adjustment control.Network communication unit 505 is connected to network transmission module 205, with mutual with the computer or the data in server of data center, uploads vehicle data and status alert etc.Data buffer storage unit 509 go out to stop up at network, when network communication unit 505 can't be with data upload, can vehicle data be buffered in this unit; After network recovery is unobstructed; Upload the data to data center again, grasp vehicle data, prevent to occur in the too much upload procedure of accumulation data the situation of network overload in order not influence the car plate identification card; Data cached uploading can be adopted passive mode; Data center obtains the vehicle data in the car plate identification card through regularly inquiring about, after successfully receiving, and the data in the deletion car plate identification card.Real-time clock unit 508 provides reference time for whole car plate identification card, carries out operations such as light modulation, temporal information stack according to this time.The detection that watchdog circuit 510 is responsible for whole identification card, if cause the identification card program crashing unusually, watchdog circuit will produce reset signal, this identification card resetted restart; In addition, this identification card can enable timing reset, when the time runs to the time point of setting, can start watchdog circuit this identification card that resets, and prevents the mistake accumulation that operation for a long time causes.
Two kinds of triggering modes that the car plate identification card is integrated triggers and trigger based on video based on coil; Dual mode can use separately; Also can coordinate to use; Owing to designed the coil status detection in this system, when coil breaks down, wagon detector 201 will be transferred to the coil fault signal at place the car plate identification card of appointment through vehicle checker control module 202.If the car plate identification card has enabled the coil fault automatic switching function, identification card will automatically switch to the video trigger mode, send coil fault information simultaneously to computer that is connected or server, remind the user to overhaul.Its concrete treatment scheme is as shown in Figure 6: judge whether to carry out video after the system start-up and trigger; If; Then obtain the feature video image, carry out Video Detection, having car to obtain the video image driving board identification of going forward side by side through out-of-date according to the flow process of routine; Judge whether car plate is effective, effectively words will be carried out data upload; After uploading end, carry out the detection of next round.The invalid words of car plate data of identification are carried out the judgement that video next time triggers again; Do not trigger if do not carry out video, then carry out the coil state-detection, when the coil non-fault, adopt normal coil to trigger flow process; Whether have car pass through, if there is car to pass through, then obtain panorama and feature video image if detecting; The driving board of going forward side by side is discerned; And the data after will discerning carry out data upload, upload end after, carry out the detection of next round; Otherwise directly carry out the detection of next round.When coil has fault, then judge whether to have launched switching, if launched switching, then obtain the feature video image, proceed processes such as Video Detection then; Otherwise directly carry out the detection of next round.
Merged during above-mentioned car plate identification card video triggers that video based on car plate triggers and triggered algorithm based on the video of background; Triggering algorithm based on car plate is in each two field picture, all car plate to be detected; Just explain have car to pass through if detect car plate; Otherwise do not have car to pass through, like this concerning have car plate and car plate relatively clearly the vehicle relatively accurately, but stained or do not have and just miss probably the vehicle of car plate concerning car plate.The algorithm that triggers based on background is that the moving target in the background is detected, and has or not car plate to detect, but it is relatively more responsive to illumination, pavement texture to be based on the triggering mode of background; Shadow under particularly shining upon, evening car light projection, be difficult to the actual location of accurate in locating car, so have than higher false triggering rate based on the triggering mode of background; In the present invention two kinds are combined; With the car plate triggering is main, and it is auxilliary triggering based on background, is carrying out logic decision from triggered time and space; As shown in Figure 8, concrete step is following:
1, the video camera of each front end system is gathered the video image of characteristic camera with the speed of 25 frame/seconds, to obtain the feature video data;
2, obtain feature video and do Video Detection by wagon detector 201 and 202 pairs of these video images of vehicle checker control module afterwards based on car plate; Whether the zone of detecting wherein appointment has car plate to pass through; There is car to pass through if any then explaining; Be provided with car through flag, got into for the 4th step, otherwise got into for the 3rd step;
3, video image is done the motion detection based on background,, then directly jumped to for the 4th step, if detect moving target as not detecting moving target; And at preceding N (average velocity of N value and actual vehicle operation is relevant, and the high more value of speed is more little, in the present embodiment; During 80Km/h, get representative value 5) all do not detect moving target in the frame, explained that car passes through; And be new moving target, then be provided with car through flag, otherwise got into for the 4th step;
Do not pass through if 4 detect moving target; Perhaps detect moving target; But preceding N frame has detected moving target; Perhaps by the 2nd, 3 steps detect vehicle through and also be provided with car and passed through flag, then the background in the up-to-date video image is upgraded, so that background next time detects.
Above-mentionedly trigger and trigger way of combining based on car plate and reduced based on car plate and trigger no car plate, stained car plate and the leakage triggering of blocking car plate based on background; Simultaneously also remedied the false triggering that causes based on illumination of background triggering mode and pavement texture etc., this mode has been improved whole toggle rate and accuracy rate greatly.
In order in multilane, to realize seamless covering, adopted the mode of virtual coil among the present invention.At adjacent lane intermediate configurations identification card and video camera, when vehicle did not have cross-line to go, the coil in each track front end system was responsible for monitoring the vehicle triggering situation in each track; When the vehicle cross-line go (adjacent two kinds of coils trigger simultaneously or interval time very little, just think that cross-line goes), vehicle will trigger identification card in the middle of the adjacent lane and control video camera and capture the car plate data.The adjacent lane that causes triggers simultaneously because vehicle goes side by side in order to prevent, when triggered in virtual track, adjacent lane all triggered simultaneously, has avoided like this because the leakage that erroneous judgement causes triggers.When detecting coil and break down, the identification card in track, place will obtain the coil fault warning message, and the virtual coil track that meanwhile this coil adjoined also obtains the coil fault alerting signal.
The above-mentioned automatic license plate identification system that is used for city bayonet socket or public security bayonet socket is mainly used in vehicle room entry/exit management, overspeed snapping and the monitoring etc. of coming in and going out; Its construction and installation are simple; System stability is reliable; It is high not only light to be changed adaptability, and candid photograph is high with discrimination, can satisfy in different cities bayonet socket and the public security bayonet socket demand to the car plate candid photograph.
As shown in Figure 9; Being a kind of application example of the present invention in the bayonet socket of city, is the instance in one two track, and each front end system frame is on the portal frame about the above 7m in road surface; Only shown the front end system on the direction among the figure; Top has 3 front end systems, and wherein front end system 1 is used for taking the feature video image with front end system 2, and front end system 3 is used for the video image that pans.Wagon detector 201, vehicle checker control module 202, car plate identification module 203 and network communication module 205 all are installed in the bayonet socket rack.In the present embodiment; Owing to have only two tracks; So have only two identification cards in the car plate identification module; Be in charge of a lane identification separately, adopt external sync mode in each front end system, by the front end system 3 at panoramic camera place provide synchronous clock to front end system 1 and front end system 2 accomplish each video camera 401 and LED light filling unit 402 on the whole direction synchronously.LP1 and LP2, LP3 and LP4 are respectively the velocity coils in two tracks and capture coil.When vehicle ' is passed through bayonet socket; Test the speed and capture by coil LP1, LP2 and front end system 1, and carry out the identification and the data upload of car plate by the wagon detector in the bayonet socket rack 201, vehicle checker control module 202, car plate identification module 203 and network communication module 205.
Above embodiment only is explanation the present invention, and is not to be used to limit the present invention.Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, belong within the scope of claim of the present invention and equivalent technologies thereof if of the present invention these are revised with modification, then the present invention also is intended to comprise these changes and modification interior.
Claims (13)
1. an automatic license plate identification system at urban checkpoint is characterized in that, comprising:
Coil groups is connected to the vehicle detection module, when vehicle produces pulse signal through out-of-date coil;
The vehicle detection module is used for the magnetic test coil group, and the pulse signal that receives is sent to the car plate identification module;
The car plate identification module is used for when receiving pulse signal, grasping the video image that front-end module sends over, and accomplishes the video image processing procedure to whole car plate identification, and through network upload process result; And, receive the failure alarm signal that is sent when coil breaks down from the vehicle detection module, automatically switch to the video trigger mode; Simultaneously this failure alarm signal is uploaded to data center through network transmission module, and is main with the car plate triggering, it is auxilliary triggering based on background; Carry out logic determines from triggered time and space; Trigger and grasp video image, accomplish video image processing procedure whole car plate identification, and through network upload process result;
Front-end module is used under the control of vehicle identification module the synchronous exposure of video camera and light filling, capture video image simultaneously, and with transmission of video images to the car plate identification module;
Network transmission module is used for car plate and vehicle data are uploaded to data center.
2. system according to claim 1 is characterized in that said front-end module comprises a plurality of front end systems, front end system of each lane configurations; Front end system comprises:
Video camera is used to take the vehicle image that comprises the car plate video image;
LED light filling unit is used under the situation of insufficient light, realizes the light filling to camera;
Lock unit is used to make all video cameras on the same direction to take simultaneously, and makes all LED light filling unit matching video cameras light fillings simultaneously.
3. system according to claim 2 is characterized in that said front end system also comprises communication unit, is used for converting the control signal that the car plate identification module sends over RS485 signal format into the TTL serial data, is used for controlling video camera and lock unit.
4. system according to claim 2 is characterized in that, the vision signal under video camera will be taken sends the car plate identification module to; The car plate identification module carries out Luminance Analysis to vision signal; And compare with the parameter of configuration, aperture, shutter and the gain of controlling video camera in view of the above reach the adjusting luminance video, send instruction if brightness reaches the benchmark that needs light filling and give lock unit; Open LED light filling unit and carry out light filling, otherwise close LED light filling unit.
5. system according to claim 2 is characterized in that said lock unit comprises control module and dispensing unit, and dispensing unit is used to dispose the method for synchronization of control module; When the method for synchronization was internal synchronization mode, control module produced synchronous clock actuated camera and the work of LED light filling units synchronization.
6. system according to claim 5; It is characterized in that; When the method for synchronization is external sync mode; Said lock unit also comprises outer sync cap, and outside synchronous clock line inserts synchronous control unit through outer sync cap, makes equidirectional with all video cameras on the section and the work of LED light filling units synchronization.
7. system according to claim 6; It is characterized in that; When the method for synchronization is the power supply method of synchronization; Said lock unit also comprises the power supply synchronous detection unit, and the 50Hz power frequency component during its 220V AC power that detects front end system is imported comes all video camera and LED light filling unit synchronously through this signal.
8. system according to claim 1 is characterized in that, the vehicle detection module comprises:
Wagon detector is used for the magnetic test coil group, as the vehicle pulse signal that receiving coil produces during through coil and send the vehicle checker control module to;
The vehicle checker control module is used for pulse signal is sent to vehicle identification module, and the state and the pulse signal of wagon detector carried out logic analysis and control, when wagon detector or coil break down or failure alarm signal occurs sending when unusual.
9. system according to claim 8 is characterized in that, the car plate identification module comprises a plurality of vehicle identification cards, and the number of vehicle identification card is configured according to number of lanes, and each vehicle identification card comprises:
Image acquisition units is used for from front end system collection vehicle image;
Graphics processing unit is used for accomplishing car plate location and car plate identification according to the vehicle image that collects;
Trigger logic control element, be used to accomplish the control interface that links to each other with the vehicle detection module, realize that vehicle triggers the control of logic, the signal that transmits according to the vehicle detection module produces trigger pip and offers the unit that tests the speed;
The unit that tests the speed is used for trigger pip is analyzed, and converts velocity information into;
The network communication unit is used to realize and the information interaction of vehicle detection module, transmits the data that comprise car plate locating information, car plate identifying information, velocity information and failure alarm signal to network transmission module;
Dsp processor is used for controlling the operation of each unit of vehicle identification card.
10. system according to claim 9 is characterized in that, said each vehicle identification card also comprises:
The front-end control interface, be used for the front end system communication to accomplish control to video camera and LED light filling unit;
The real-time clock unit is used to whole car plate identification card and is provided, calendar when obtaining vehicle snapshot and temporal information reference time;
Data buffer storage unit is used for when network occurs can't transmitting data unusually, and is data cached, after network communication recovers, uploads data again;
Watchdog circuit; Be used for detecting each unit of vehicle identification card, this circuit can automatically reset at once and restart when appearance is unusual, and this circuit has the timing reset function simultaneously; The setting fixed interval time lets system reset or appointed interval after several days, resets at a fixed time.
11. system according to claim 1; It is characterized in that the car plate identification module comprises a plurality of vehicle identification cards, vehicle identification card of each lane configurations; At vehicle identification card of adjacent lane intermediate configurations; The one or more coils of each lane configurations, front-end module comprises a plurality of video cameras, in the adjacent lane intermediate configurations video camera is arranged;
Ride line when going when vehicle, the coil in then adjacent two tracks can produce pulse signal simultaneously, and the vehicle detection module is sent to the car plate identification module with the pulse signal that receives; Vehicle identification in the middle of the adjacent lane is stuck in when receiving this pulse signal, from the vision signal that front-end module sends, grasps view data, carries out the candid photograph of vehicle.
12. system according to claim 1 is characterized in that, described network transmission module comprises:
The network switch, be used for realizing a plurality of car plate identification modules cascade and with being connected of the bayonet socket computer at system place;
Optical transmission device, the bayonet socket that is used for belonging to when system is accomplished safe remote data communication through optical fiber when data center is far away.
13. system according to claim 1; It is characterized in that; Front-end module also is used to carry out video image acquisition, and when launching the video trigger mode, the car plate identification module is used for that also car plate is carried out in the zone of each the two field picture appointment that collects and detects; Detect based on background simultaneously, detect moving object wherein; If detect car plate, then control front-end module and capture, upgrade background, continue to gather video image; If do not detect car plate, background does not detect moving object in detecting yet, and then upgrades background, continues to gather video image; If do not detect car plate, background detects moving object in detecting, and triggers candid photograph in the N frame recently, then controls front-end module and captures, and upgrades background, continues to gather video image.
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| CN2009100777461A CN101807346B (en) | 2009-02-16 | 2009-02-16 | Automatic license plate identification system at urban checkpoint |
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| CN2009100777461A CN101807346B (en) | 2009-02-16 | 2009-02-16 | Automatic license plate identification system at urban checkpoint |
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