CN101930668B - Processing method of road traffic OD (Optical Density) information collection system for license plate recognition - Google Patents
Processing method of road traffic OD (Optical Density) information collection system for license plate recognition Download PDFInfo
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Abstract
The invention relates to a road traffic OD information collection system for license plate recognition data, which comprises three subsystems of a roadside data collection subsystem, a roadside communication subsystem and a license plate recognition collection and processing platform subsystem; high-speed communication, transmission and data invocation between the data collection subsystem and the license plate recognition subsystem are finished by utilizing the roadside communication subsystem. The processing method comprises the following working steps from step 1 to step 7: storing and uploading the license plate recognition information of an external field collection section; secondary cleaning and secondary recognition; tracing and updating vehicle routes in real time; processing single-vehicle track tracing and revising single-vehicle OD errors caused by errors generated during the license plate information collection and transmission; counting the number of specific vehicles with the same types, the same starting points and destinations and in the same period when passing through the destinations; classifying and storing the revised OD values according to the information of the statistics periods, the vehicle types, the destinations and the like; and displaying an OD distribution matrix in forms of reports and graphs.
Description
Technical field
The present invention relates to the road traffic OD (Optical Density) information collection system and the disposal route thereof of a kind of urban transportation information acquisition system and disposal route, particularly a kind of license plate identification data, belong to the intelligent transport technology field.
Background technology
Since getting into 21 century, urban road construction, the increase of motor vehicles recoverable amount have all got into Rapid development stage.Meanwhile, through the construction of urban transportation information acquisition system,, good social, economy and environmental benefit have been obtained at aspects such as control of traffic and road, the application and service of support Traffic Information.But; Existing acquisition of road traffic information system; Different along with the traffic flow character of mulched ground extension of a field and zones of different road net; Also progressively demonstrate its inherent deficiency, or show that the transport information content obtained is not enough or show that the cost that obtains transport information crosses high shortcoming.
Road traffic OD (Origin Destination) is meant that the trip volume of traffic between the road terminus distributes, and its result representes with two-dimension table or matrix usually.Road grid traffic OD distributed intelligence is gathered, and can improve the urban transportation model, for traffic strategic research, traffic programme, traffic administration provide the quantitative test basis, provides data to support for alleviating the nervous traffic in city; Also can analyze the situation of change of basic trip characteristics such as Urban Residential Trip source strength, distribution, transport structure, trip purpose; Can analyze the basic reason that contradiction is supplied with in transport need, for Transportation Demand Management provides theoretical foundation from the angle of resident trip; On the basis of grasping the resident trip rule, construct traffic model, carry out the traffic programme service of science for the city.
One of method that traditional OD information is obtained is the OD sample survey, requires all to be provided line time by the respondent, goes out beginning-of-line, information such as trip purpose ground, trip mode.At number of patent application is 200710024832.7; Publication number is in the OD information getting method of CN101127040; The form of employing questionnaire list is sampled to the part vehicle driving information on the network of highways and is calculated bulk sample OD distribution matrix originally; But the artificial sampling investigation needs human and material resources, the financial resources of labor; It is obviously infeasible frequently to carry out large-scale traffic study, and because capital construction and the equal frequent variation of traffic knot, so the confidence level of its OD matrix that obtains is also lower; At number of patent application is 200610118461.4; Publication number is in the OD analytical approach of CN1959759; Utilize the GPS Vehicle positioning system that the trip track of taxi colony is write down and generate the OD distribution matrix of hiring a car; But the OD matrix that it obtains only is this independent colony of taxi that possesses the GPS locating device, has bigger limitation; At number of patent application is 200810038365.8; Publication number is in the OD projectional technique of CN101295326; Utilize the taxi GPS locator data of a small amount of sampling to calculate the probability that vehicle OD trip distributes and use actual traffic flow that the traffic simulation means satisfy the need online and carry out Random assignment and calculate this OD distribution matrix of bulk sample; But the trip of taxi distributes and has the singularity of colony, and is not representative to the traffic trip behavior that road network is whole.
To be that OD is counter push away the method for another kind of OD information acquisition, through the road section traffic volume flow data, and according to various model algorithms, the anti-traffic OD distribution matrix that pushes away.At number of patent application is 200810084396.7; Publication number is in the road network OD projectional technique of CN101261768; Utilize the historical OD data and the reckoning of highway section actual flow observed reading of network of highways to obtain current OD distribution matrix; Because link flow detects error and the anti-limitation that pushes away model existence aspect algorithm hypothesis and parameter calibration of OD that exists, and often causes anti-result who pushes away of OD and truth to exist than large deviation.
Summary of the invention:
The object of the present invention is to provide a kind of road traffic OD (Optical Density) information collection system and disposal route thereof of license plate identification data; This system and disposal route thereof; Can gather long-term, dynamic, the high-quality OD information in urban road traffic network automatically, for Transportation Demand Management provides theoretical foundation; And grasp on the basis of resident trip rule, construct traffic model, carry out the traffic programme service of science for the city.
For achieving the above object, technical scheme of the present invention is that the road traffic OD (Optical Density) information collection system of said license plate identification data and disposal route thereof comprise roadside data acquisition subsystem, roadside communication subsystem, car plate Recognition and Acquisition processing platform subsystem; Described roadside data acquisition subsystem; Comprise the video camera, DETECTION OF TRAFFIC PARAMETERS unit, Industry Control process computer, portal frame and support, the power-supply unit etc. that are laid in the outfield again, bear the catching of vehicle and licence plate picture, license plate identification processing, DETECTION OF TRAFFIC PARAMETERS, original data storage management; Described car plate Recognition and Acquisition processing platform subsystem; Comprise spine switches, database server, application server, terminal and needed memory device, safety equipment, network management device etc. again, accomplish that the roadside data acquisition subsystem obtains various raw data, carries out needed various processing, data storage and the management of storage data.
Accomplish high-speed communication through the roadside communication subsystem between described roadside data acquisition subsystem and the system's car plate Recognition and Acquisition processing platform subsystem; The various raw data that transmission roadside data acquisition subsystem is gathered satisfy system's car plate Recognition and Acquisition processing platform subsystem calling the various data of distributed storage in each roadside data acquisition subsystem.
Another purpose is the road traffic OD (Optical Density) information collection system of described license plate identification data and the disposal route of disposal route thereof; Realize that through following information acquisition module, pre-processing module, bicycle track following module, OD correcting module, bicycle OD generation module, OD statistical module, OD distribution display module, configurations module its job step is:
Step 1: information acquisition module to the outfield gather the car plate feature, number plate of vehicle, car plate color, vehicle, elapsed time of each section, through information such as place, vehicle color, and these car plate identifying informations are stored and upload;
Step 2: with the identifying information of step 1, through module, the car plate feature that can't discern that the outfield is gathered carries out secondary cleaning and identification again, further improves the precision that license board information is gathered through pre-service;
Step 3: bicycle track following module is carried out real-time tracking and renewal to the vehicle route that the road traffic OD (Optical Density) information collection system of license plate identification data captures, and its up-to-date routing information comprises the state (time, place etc.) of the car plate identification section that the Back ground Information (possession, vehicle etc.) of vehicle and trip are before passed through;
The key link of bicycle track following is that the section record of the up-to-date car plate process of uploading is right with the section record queue matching ratio before the vehicle; If car plate matees successfully and then the up-to-date path of the current trip of vehicle upgraded, otherwise then regenerate the trip path of an other real-time update;
The bicycle OD error that the error that step 4:OD correcting module produces the license board information collection and transmission causes is revised.Concrete modification method comprises: (1) car plate fuzzy matching.Because the identification error that car plate identification possibly exist adopts the method for the accurate fully coupling of car plate may bring certain matching error, causes the disappearance of bicycle track following process middle part sub-path node.Therefore formulated corresponding fuzzy matching rule; Occurring the matching error of specific character between two car plates but satisfying under the prerequisite of other matching conditions; Assert that these two number-plate numbers mate successfully, can under the situation of car plate individual characters identification error, still guarantee the integrality and the accuracy in vehicle driving path like this; (2) the path node disappearance is repaired.Fuzzy matching can significantly reduce the probability of node disappearance in the path, but the situation of the path node disappearance that produces for exceeding the fuzzy matching rule need be repaired the path, to guarantee the integrality in path.Relevant repair information is repaired and write down to some node disappearance in bicycle trip path according to the connectedness and the upstream and downstream relation of road, according to the principle of shortest path to the node of lost part;
Step 5: bicycle OD generation module is on the basis of bicycle track following, to handle, and when the new trip section information of this car plate does not appear in downstream in the time range of setting, can confirm that the trip OD of this car plate has accomplished and write the database of bicycle OD; Otherwise the continuation of this car plate keeps track following, occurs and real-time track is upgraded until the new trip section record of car plate;
Bicycle OD record is the information of the minimum particle size unit in the OD Distribution calculation, and the OD that can further generate the minizone through the statistics to the bicycle trip distributes.The information of bicycle OD recording storage comprises information such as the car plate identification section sequence, section elapsed time of vehicle process in trip once;
Step 6:OD statistical module generates each car plate and gathers OD distribution matrix between the section of the designated vehicle type between the section adding up meeting the designated vehicle type in the road network, the trip origin and destination are identical and are positioned at the bicycle OD record number in same cycle through settled time.Because the disappearance of the beginning or end of part vehicle OD; Can cause having certain deviation between statistical value and the actual value of OD observed quantity between section; Through analyzing the mechanism that OD observed quantity error produces; The check equations group of setting up between observation OD amount and the section flow is revised the OD error that the terminus disappearance causes, and synthesizes minizone OD distribution matrix according to the membership of section and sub-district;
Step 7:OD storage is stored revised OD value with display module according to information classifications such as measurement period, type of vehicle and origin and destination, and road network Dynamic OD distribution matrix is carried out form and pattern exhibiting.
Beneficial effect of the present invention: the road traffic OD (Optical Density) information collection system of described license plate identification data and disposal route thereof; Have the following advantages: (1) OD data class is abundanter; The realization traffic information collection (2) that becomes more meticulous has more high precision and reliability (3) average acquiring cost lower (4) to obtain difficulty lower; The early-stage preparations a large amount of with respect to manual research, field investigation and late time data are handled; And complicated algorithm design, proof of algorithm and the debugging work of model reckoning needs; The road traffic OD (Optical Density) information collection system of license plate identification data and disposal route thereof all are more prone to realize having tangible economic benefit and social benefit in many links such as algorithm design and data processing.
Below in conjunction with accompanying drawing and embodiment to the present invention's detailed explanation of making comparisons.
Description of drawings:
Fig. 1 is that the road traffic OD (Optical Density) information collection system of license plate identification data of the present invention totally constitutes block diagram;
Fig. 2 is the process flow figure of the road traffic OD (Optical Density) information collection system of license plate identification data of the present invention.
Embodiment
With reference to Fig. 1, this is that the road traffic OD (Optical Density) information collection system of license plate identification data of the present invention totally constitutes block diagram.
As shown in the figure, it comprises roadside data acquisition subsystem 1, roadside communication subsystem 2, car plate Recognition and Acquisition processing platform subsystem 3.
Roadside data acquisition subsystem 1 comprises the video camera, DETECTION OF TRAFFIC PARAMETERS unit, Industry Control process computer, portal frame and support, the power-supply unit facility etc. that are laid in the outfield.The roadside data acquisition subsystem is born functions such as the catching of vehicle and licence plate picture, license plate identification processing, DETECTION OF TRAFFIC PARAMETERS, original data storage management.
Car plate Recognition and Acquisition processing platform subsystem 3 comprises spine switches, database server, application server, terminal and needed memory device, safety equipment, network management device etc.Car plate Recognition and Acquisition processing platform subsystem; Accomplish that the roadside data acquisition subsystem obtains various raw data, carries out needed various processing, data storage and to the management of storage data, wherein said spine switches connects database server and application server respectively.
Accomplish high-speed communication through roadside communication subsystem 2 between described roadside data acquisition subsystem 1 and the system's car plate Recognition and Acquisition processing platform subsystem 3; The various raw data that transmission roadside data acquisition subsystem is gathered satisfy system's car plate Recognition and Acquisition processing platform subsystem calling the various data of distributed storage in each roadside data acquisition subsystem.
The module that road traffic OD (Optical Density) information collection system adopts of license plate identification data of the present invention constitutes.
Disposal route that information acquisition system of the present invention adopts realizes through following module.It comprises information acquisition module 4, pre-processing module 5, bicycle track following module 6, OD correcting module 7, bicycle OD generation module 8, OD statistical module 9, OD distribution display module 10, configurations module 11).
With reference to Fig. 2, this is the road traffic OD (Optical Density) information collection system process flow figure of license plate identification data of the present invention.As shown in the figure, job step of the present invention is:
Step 1: information acquisition module to the outfield gather each section car plate feature, number plate of vehicle, car plate color, vehicle, elapsed time, store and upload through car plate identifying informations such as places;
Step 2: the car plate feature that can't discern that pre-service is gathered the outfield through module carries out secondary cleaning and identification again, further improves the precision that license board information is gathered;
Step 3: bicycle track following module is carried out real-time tracking and renewal to the vehicle route that the road traffic OD (Optical Density) information collection system of license plate identification data captures, and its up-to-date routing information comprises the state (time, place etc.) of the car plate identification section that the Back ground Information (possession, vehicle etc.) of vehicle and trip are before passed through;
The key link of bicycle track following is that the section record of the up-to-date car plate process of uploading is right with the section record queue matching ratio before the vehicle; If car plate matees successfully and then the up-to-date path of the current trip of vehicle upgraded, otherwise then regenerate the trip path of an other real-time update;
The bicycle OD error that the error that step 4:OD correcting module produces the license board information collection and transmission causes is revised.Concrete modification method comprises: (1) car plate fuzzy matching.Because the identification error that car plate identification possibly exist adopts the method for the accurate fully coupling of car plate may bring certain matching error, causes the disappearance of bicycle track following process middle part sub-path node.Therefore formulated corresponding fuzzy matching rule; Occurring the matching error of specific character between two car plates but satisfying under the prerequisite of other matching conditions; Assert that these two number-plate numbers mate successfully, can under the situation of car plate individual characters identification error, still guarantee the integrality and the accuracy in vehicle driving path like this; (2) the path node disappearance is repaired.Fuzzy matching can significantly reduce the probability of node disappearance in the path, but the situation of the path node disappearance that produces for exceeding the fuzzy matching rule need be repaired the path, to guarantee the integrality in path.Relevant repair information is repaired and write down to some node disappearance in bicycle trip path according to the connectedness and the upstream and downstream relation of road, according to the principle of shortest path to the node of lost part;
Step 5: bicycle OD generation module is on the basis of bicycle track following, to handle, and when the new trip section information of this car plate does not appear in downstream in the time range of setting, can confirm that the trip OD of this car plate has accomplished and write the database of bicycle OD; Otherwise the continuation of this car plate keeps track following, occurs and real-time track is upgraded until the new trip section record of car plate;
Bicycle OD record is the information of the minimum particle size unit in the OD Distribution calculation, and the OD that can further generate the minizone through the statistics to the bicycle trip distributes.The information of bicycle OD recording storage comprises information such as the car plate identification section sequence, section elapsed time of vehicle process in trip once;
Step 6:OD statistical module generates each car plate and gathers OD distribution matrix between the section of the designated vehicle type between the section adding up meeting the designated vehicle type in the road network, the trip origin and destination are identical and are positioned at the bicycle OD record number in same cycle through settled time.Because the disappearance of the beginning or end of part vehicle OD; Can cause having certain deviation between statistical value and the actual value of OD observed quantity between section; Through analyzing the mechanism that OD observed quantity error produces; The check equations group of setting up between observation OD amount and the section flow is revised the OD error that the terminus disappearance causes, and synthesizes minizone OD distribution matrix according to the membership of section and sub-district;
Step 7:OD storage is stored revised OD value with display module according to information classifications such as measurement period, type of vehicle and origin and destination, and road network Dynamic OD distribution matrix is carried out form and pattern exhibiting.
Though the present invention describes with reference to the above embodiments; But those of ordinary skill in the art; Will be appreciated that above embodiment is used for explaining the present invention, should understand and wherein can make variations and modifications and do not break away from the present invention in a broad sense, so be not as to qualification of the present invention; As long as in connotation scope of the present invention, to the variation of above-described embodiment, the protection domain that distortion all will fall into claim of the present invention.
Claims (4)
1. the disposal route of car plate identification OD information acquisition system, this car plate identification OD information acquisition system comprises roadside data acquisition subsystem (1), roadside communication subsystem (2), car plate Recognition and Acquisition processing platform subsystem (3); Between described roadside data acquisition subsystem (1) and the system's car plate Recognition and Acquisition processing platform subsystem (3); Accomplish high-speed communication through roadside communication subsystem (2); The various raw data that transmission roadside data acquisition subsystem is gathered are satisfied with system's car plate Recognition and Acquisition processing platform subsystem calling the various data of distributed storage in each roadside data acquisition subsystem; Described roadside data acquisition subsystem (1); Bear the catching of vehicle and licence plate picture, license plate identification processing, DETECTION OF TRAFFIC PARAMETERS, original data storage management, it comprises video camera, DETECTION OF TRAFFIC PARAMETERS unit, Industry Control process computer, portal frame and support, the power-supply unit that is located at the outfield; Described car plate Recognition and Acquisition processing platform subsystem (3); Be accomplish that the roadside data acquisition subsystem obtains various raw data, carries out needed various processing, data storage and to the management of storage data, it comprises spine switches, database server, application server, terminal and needed memory device, safety equipment, network management device; Described information acquisition system; Comprise information acquisition module (4), pre-processing module (5), bicycle track following module (6), OD correcting module (7), bicycle OD generation module (8), OD statistical module (9), OD distribution display module (10), configurations module (11); It is characterized in that: described disposal route, its job step is:
Step 1, information acquisition module, to the outfield gather each section car plate feature, number plate of vehicle, car plate color, vehicle, elapsed time, store and upload through place car plate identifying information;
Step 2, pre-service are through module, and the car plate feature that can't discern that the outfield is gathered carries out secondary cleaning and identification again;
Step 3; Bicycle track following module; The vehicle route that the traffic OD information acquisition system of license plate identification data is captured carries out real-time tracking and renewal, its up-to-date routing information comprise the car plate identification section that possession, vehicle Back ground Information and the trip before of vehicle are passed through time, three-point state information;
Step 4, the OD correcting module, what the error that the license board information collection and transmission are produced caused knows an OD mistake for repeatedly OD and OD terminus identification error are revised; Concrete modification method comprises: (1) car plate fuzzy matching: because the identification error that car plate identification possibly exist; Adopt the method that car plate fully accurately matees to bring certain matching error, cause the disappearance of bicycle track following process middle part sub-path node; Therefore formulated corresponding fuzzy matching rule; Occurring the matching error of specific character between two car plates but satisfying under the prerequisite of other matching conditions; Assert that these two number-plate numbers mate successfully, can under the situation of car plate individual characters identification error, still guarantee the integrality and the accuracy in vehicle driving path like this; (2) the path node disappearance is repaired: fuzzy matching can significantly reduce the probability of node disappearance in the path, but the situation of the path node disappearance that produces for exceeding the fuzzy matching rule need be repaired the path, to guarantee the integrality in path; Relevant repair information is repaired and write down to some node disappearance in bicycle trip path according to the connectedness and the upstream and downstream relation of road, according to the principle of shortest path to the node of lost part;
Step 5, bicycle OD generation module is on the basis of bicycle track following, to handle, and when the new trip section information of this car plate does not appear in downstream in the time range of setting, can confirm that the trip OD of this car plate has accomplished and write the database of bicycle OD; Otherwise the continuation of this car plate keeps track following, occurs and real-time track is upgraded until the new trip section record of car plate;
Step 6; The OD statistical module is added up meeting the designated vehicle type in the road network, the trip origin and destination are identical and are positioned at the bicycle OD record number in same cycle through settled time; Generate each car plate and gather the section OD difference matrix of the designated vehicle type between the section; Because the disappearance of the beginning or end of part vehicle OD; Can cause having certain deviation between statistical value and the actual value of OD observed quantity between section; Through analyzing the mechanism of OD observed quantity error generation, the check equations group of setting up between observation OD amount and the section flow is revised the OD error that the terminus disappearance causes, and synthesizes minizone OD distribution matrix according to the membership of section and sub-district;
Step 7, the OD storage is stored revised OD value with display module according to measurement period, type of vehicle and origin and destination information classification, and road network Dynamic OD distribution matrix is carried out form and pattern exhibiting.
2. the disposal route of car plate identification OD information acquisition system according to claim 1; It is characterized in that: described bicycle track following module; Its key link is that the section record of the up-to-date car plate process of uploading is right with the section record queue matching ratio before the vehicle; If car plate matees successfully and then the up-to-date path of the current trip of vehicle upgraded, otherwise then regenerate the trip path of an other real-time update.
3. the disposal route of car plate identification OD information acquisition system according to claim 1; It is characterized in that: described bicycle OD record; Be the information of the minimum particle size unit in the OD Distribution calculation, through the statistics to the bicycle trip, the OD that further generates the minizone distributes.
4. according to the disposal route of claim 1 or 3 described car plates identification OD information acquisition systems; It is characterized in that: described bicycle OD record; Be the information of bicycle OD recording storage, comprise car plate identification section sequence, the section elapsed time information of vehicle process in once going on a journey.
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