CN106846808B - A kind of vehicle parking based on license plate data time number calculating method - Google Patents
A kind of vehicle parking based on license plate data time number calculating method Download PDFInfo
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- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/01—Detecting movement of traffic to be counted or controlled
- G08G1/0104—Measuring and analyzing of parameters relative to traffic conditions
- G08G1/0108—Measuring and analyzing of parameters relative to traffic conditions based on the source of data
- G08G1/0112—Measuring and analyzing of parameters relative to traffic conditions based on the source of data from the vehicle, e.g. floating car data [FCD]
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- G—PHYSICS
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- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/01—Detecting movement of traffic to be counted or controlled
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- G08G1/0125—Traffic data processing
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Abstract
The invention discloses a kind of vehicle parking based on license plate data time number calculating methods.This method is based on license plate data and calculates the signal period scheme of intersection, the stop frequency of effective vehicle, the stop frequency of other vehicles and the equal stop frequency of vehicle in conjunction with Urban Travel Time characteristic.The present invention provides solid foundation for urban transportation control, dynamic decision foundation can also be provided for traffic participant, while this method makes full use of travel time data characteristic, parameter calculating does not depend on artificial selection, is easy to Project Realization.
Description
Technical field
The present invention relates to it is a kind of by license plate data calculate vehicle parking number method, serve urban traffic control with
Management, belongs to intelligent transportation research field.
Background technique
By the journey time of license plate data acquisition vehicle, and then vehicle parking number is calculated, can be urban transportation pipe
Control provides solid foundation, dynamic decision foundation can also be provided for traffic participant, to induce urban transportation benign development.
The research of vehicle parking number in urban road is concentrated mainly in the application of stop frequency at present, and it is secondary to stop
Several acquisitions mainly passes through track of vehicle data, such as floating car data.The accurate calculating of stop frequency can service traffic shape
State evaluation, traffic signalization can be used for calculating other traffic parameters, such as vehicle delay, queue length.
In previous stop frequency calculation method, the floating car data sample rate being widely used is lower, and its
Being unevenly distributed in city road network, and then the accuracy and accuracy of stop frequency are influenced, and rolling stock cannot be obtained
Stop frequency.As electronic police equipment, the laying rate of RFID are gradually increased, when magnanimity license plate data and urban road stroke
Between the acquisitions of data be possibly realized, be possibly realized by the stop frequency that travel time data obtains each car, therefore establish one
A vehicle parking based on license plate data time number calculating method is particularly important.
Summary of the invention
The purpose of the present invention is to provide a kind of vehicle parking based on license plate data time number calculating methods.
The present invention is based on license plate data, in conjunction with Urban Travel Time characteristic, and then obtain bicycle stop frequency, Che Jun
Stop frequency.To achieve the above object, it is proposed by the present invention by the vehicle parking of license plate data time number calculating method include based on
It is equal to calculate the signal period scheme of intersection, the stop frequency for calculating effective vehicle, the stop frequency for calculating other vehicles, calculating vehicle
Four steps of stop frequency.
The basic step of this method is as follows:
C1, the signal period scheme for calculating intersection.
C2, the stop frequency for calculating effective vehicle.
C3, the stop frequency for calculating other vehicles.
C4, the equal stop frequency of vehicle is calculated.
The process of signal period scheme that step c1 calculates intersection includes:
C11, license plate data are enabled to cross vehicle moment t in downstream intersectioni, by hierarchical clustering method to tiHierarchical clustering is carried out,
Between class distance is taken as period C, finally obtains K cluster.
C12, by k-th cluster in include under swim across the vehicle moment, calculate phase kth period, S start timek, i.e.,
Be k-th cluster in earliest under swim across the vehicle moment, then the end cycle moment be+1 start time in period S of kthk+1:
Sk=ti,min-a
In formula, Sk--- phase start time in kth period；
ti,min--- the vehicle moment is swum across under earliest in kth cluster；
A --- consider that the adjusting parameter that starting loss introduces, default take 5s.
C13, k-th of cluster of extraction i.e. kth period cross vehicle time data collection by the vehicle in downstream:
Yk=X | Sk≤ti<Sk+1}
In formula, Yk--- the kth period crosses vehicle time data collection by the vehicle in downstream, is stopped comprising each vehicle by downstream
The detection moment of fare；
The process that the stop frequency of effective vehicle is calculated in step c2 includes:
C21, vehicle time data collection Y is crossed to the kth periodkEach of element ti, by its license plate number respectively upper and lower
The detected moment for swimming intersection calculates the journey time T that the vehicle passes through the sectionk,iIf the license plate is also detected in upstream
It measures, then otherwise it is other vehicles that the vehicle, which is effective vehicle,.The journey time of effective vehicle are as follows:
In formula, Tk,i--- i-th vehicle of kth period passes through the journey time in the section on section；
--- at the time of i-th vehicle of kth period passes through upstream stop line on section, wherein i=1,2,3 ... ...,
Iup；
--- at the time of i-th vehicle of kth period passes through downstream stop line on section, wherein i=1,2,3 ... ...,
Idown；
C22, the effective vehicle data collection and other vehicle data collection for extracting the kth period:
Xk={ Yk|(Sk≤ti<Sk+1)∧(Tk,i>0)}
In formula, Xk--- effective vehicle data collection in kth period on section is stopped comprising each effective vehicle by downstream
The journey time of the detection moment of line and the vehicle；
Wk--- other vehicle data collection in kth period on section, the downstream vehicle that corresponding all upstreams are not detected,
Pass through the detection moment of downstream stop line comprising each other vehicles.
C23, by effective vehicle data collection XkIn journey time Tk,iHierarchical clustering is carried out, between class distance is taken as period C,
Finally gather for D class, the number d of every one kind.Vehicle stop frequency having the same under d class number, enables the vehicle pair of d class
The stop frequency answered be S to get arrive each effective vehicle tiJourney time be Tk,i, stop frequency Sk,i。
The process that the stop frequency of other vehicles is calculated in step c3 includes:
C31, in urban road, pass in succession through between the stop frequency of the vehicle of stop line have correlation.When certain
The preceding guide-car of vehicle is identical as with the stop frequency for vehicle of speeding, then the stop frequency of the vehicle is inevitable equal with preceding guide-car and with vehicle of speeding.When
Preceding guide-car's ratio of certain vehicle is with mono- train of Che Duoting of speeding, then the stop frequency of the vehicle can be judged according to the vehicle moment is spent.It is i.e. logical
It crosses and compares other vehicle data collection WkIn each vehicle and effective vehicle before and after it stop frequency, which is stopped
Train number number Sk,iJudged:
In formula, Sk,i--- the stop frequency of other vehicles of kth period, the vehicle belong to W on sectionk；
tbefore--- the effective vehicle of previous of kth period other vehicle datas spends the vehicle moment on section；
Sbefore--- the stop frequency of the effective vehicle of previous of kth period other vehicle datas on section；
tafter--- the effective vehicle of latter of kth period other vehicle datas spends the vehicle moment on section；
Safter--- the stop frequency of the effective vehicle of latter of kth period other vehicle datas on section.
The process of the calculating equal stop frequency of vehicle includes: in step c4
C41, the calculating equal stop frequency of vehicle can be using different units such as phase, section, intersections as basic unit.When with
When phase calculates phase vehicle equal stop frequency as basic unit:
In formula,--- phase vehicle equal stop frequency of the phase p in the kth period on section；
Sk,i--- the stop frequency that phase p passes through vehicle in the kth period on section；
N --- phase p passes through vehicle number in the kth period on section.
C42, when calculating vehicle equal stop frequency in section using section as basic unit:
In formula,--- section vehicle equal stop frequency of all phases in the kth period on section；
Sk,i--- the stop frequency that phase p passes through vehicle in the kth period on section；
N1--- the vehicle number that all phase p pass through in the kth period on section, wherein p=1 ... ..., P1。
C43, when calculating vehicle equal stop frequency in intersection using intersection as basic unit:
In formula,--- intersection vehicle equal stop frequency of the corresponding all phases in intersection in the kth period；
Sk,i--- the stop frequency that phase p passes through vehicle in the kth period on section；
N2--- the vehicle number that the corresponding all phases in intersection pass through in the kth period, wherein p=1 ... ..., P2。
Beneficial effects of the present invention: the present invention crosses vehicle rule, vehicle travel based on license plate data, in conjunction with urban road
Temporal regularity calculates vehicle parking number, provides solid foundation for urban transportation control, dynamic can also be provided for traffic participant
Decision-making foundation, while this method makes full use of travel time data characteristic, parameter calculating does not depend on artificial selection, is easy to engineering reality
It is existing.
Detailed description of the invention
Fig. 1 is vehicle parking time number calculating method flow chart
Fig. 2 is monocycle effective travel temporal clustering figure
Fig. 3 is multicycle effective travel temporal clustering figure
Fig. 4 is that other vehicle parking numbers calculate schematic diagram
Fig. 5 is that the equal stop frequency of vehicle calculates schematic diagram
Specific embodiment
The present invention will be described in detail with reference to the accompanying drawing, as shown in Figure 1, the specific steps of the present invention are as follows.
Step 1 calculates the signal period scheme of intersection:
License plate data are enabled to cross vehicle moment t in downstreami, using hierarchy clustering method from bottom to top, when between class distance is
When period C, K cluster, the corresponding a cycle of each cluster are obtained.
By swimming across the vehicle moment under including in k-th of cluster, phase kth period, S start time is calculatedk, as kth
In a cluster earliest under swim across the vehicle moment, then the end cycle moment be+1 start time in period S of kthk+1:
Sk=ti,min-a
In formula, Sk--- phase start time in kth period；
ti,min--- the vehicle moment is swum across under earliest in kth cluster；
A --- consider that the adjusting parameter that starting loss introduces, default take 5s；
K-th of cluster of the extraction i.e. kth period crosses vehicle time data collection by the vehicle in downstream:
Yk=X | Sk≤ti<Sk+1}
In formula, Yk--- the kth period crosses vehicle time data collection by the vehicle in downstream, is stopped comprising each vehicle by downstream
The detection moment of fare.
Step 2, the stop frequency for calculating effective vehicle are as shown in Figure 2 and Figure 3
Vehicle time data collection Y is crossed to the kth periodkEach of element ti, handed over respectively in upstream and downstream by its license plate number
The detected moment of prong calculates the journey time T that the vehicle passes through the sectionk,iIf the license plate is also detected in upstream
It arrives, then otherwise it is other vehicles that the vehicle, which is effective vehicle,.The journey time of effective vehicle are as follows:
In formula, Tk,i--- i-th vehicle of kth period passes through the journey time in the section on section；
--- at the time of i-th vehicle of kth period passes through upstream stop line on section, wherein i=1,2,3 ... ...,
Iup；
--- at the time of i-th vehicle of kth period passes through downstream stop line on section, wherein i=1,2,3 ... ...,
Idown；
Extract effective vehicle data collection and other vehicle data collection in kth period:
Xk={ Yk|(Sk≤ti<Sk+1)∧(Tk,i>0)}
In formula, Xk--- effective vehicle data collection in kth period on section is stopped comprising each effective vehicle by downstream
The journey time of the detection moment of line and the vehicle；
Wk--- other vehicle data collection in kth period on section, the downstream vehicle that corresponding all upstreams are not detected,
Pass through the detection moment of downstream stop line comprising each other vehicles.
By effective vehicle data collection XkIn journey time Tk,iHierarchical clustering is carried out, between class distance is taken as period C, finally
Gather for D class, the number d of every one kind.Vehicle stop frequency having the same under d class number, enables the vehicle of d class corresponding
Stop frequency be S to get arrive each effective vehicle tiJourney time be Tk,i, stop frequency Sk,i。
Step 3, the stop frequency for calculating other vehicles are as shown in Figure 4:
In urban road, passing in succession through has correlation between the stop frequency of the vehicle of stop line.When certain vehicle
Preceding guide-car is identical as with the stop frequency for vehicle of speeding, then the stop frequency of the vehicle is inevitable equal with preceding guide-car and with vehicle of speeding.When certain
Preceding guide-car's ratio of vehicle is with mono- train of Che Duoting of speeding, then the stop frequency of the vehicle can be judged according to the vehicle moment is spent.Pass through ratio
Compared with other vehicle data collection WkIn each vehicle and effective vehicle before and after it stop frequency, the parking time to other vehicles
Number Sk,iJudged:
In formula, Sk,i--- the stop frequency of other vehicles of kth period, the vehicle belong to W on sectionk；
tbefore--- the effective vehicle of previous of kth period other vehicle datas spends the vehicle moment on section；
Sbefore--- the stop frequency of the effective vehicle of previous of kth period other vehicle datas on section；
tafter--- the effective vehicle of latter of kth period other vehicle datas spends the vehicle moment on section；
Safter--- the stop frequency of the effective vehicle of latter of kth period other vehicle datas on section；
It is as shown in Figure 5 to calculate the equal stop frequency of vehicle for step 4:
Calculating the equal stop frequency of vehicle can be using different units such as phase, section, intersections as basic unit.When with phase
When stop frequency equal as basic unit calculating phase vehicle:
In formula,--- phase vehicle equal stop frequency of the phase p in the kth period on section；
Ski--- the vehicle number that phase p passes through in the kth period on section；
N --- phase p passes through vehicle number in the kth period on section；
When calculating vehicle equal stop frequency in section using section as basic unit:
In formula,--- section vehicle equal stop frequency of all phases in the kth period on section；
Sk,i--- the stop frequency that phase p passes through vehicle in the kth period on section；
N1--- the vehicle number that all phase p pass through in the kth period on section, wherein
P=1 ..., P1；
When calculating vehicle equal stop frequency in intersection using intersection as basic unit:
In formula,--- intersection vehicle equal stop frequency of the corresponding all phases in intersection in the kth period；
Sk,i--- the stop frequency that phase p passes through vehicle in the kth period on section；
N2--- the vehicle number that the corresponding all phases in intersection pass through in the kth period, wherein p=1 ... ..., P2。
Claims (1)
1. a kind of vehicle parking based on license plate data time number calculating method, which comprises the steps of:
C1, the signal period scheme for calculating intersection；
C2, the stop frequency for calculating effective vehicle；
C3, the stop frequency for calculating other vehicles；
C4, the equal stop frequency of vehicle is calculated；
The signal period scheme that intersection is wherein calculated in c1 includes the following steps:
C11, license plate data are enabled to spend the vehicle moment in downstream intersection as ti, by hierarchical clustering method to tiCarry out hierarchical clustering, class
Between distance be taken as period C, obtain K cluster；
C12, by k-th cluster in include under swim across the vehicle moment, calculate phase kth period, S start timek, as kth
In a cluster earliest under swim across the vehicle moment, then the end cycle moment be+1 start time in period S of kthk+1:
Sk=tI, min-a
In formula, Sk--- phase start time in kth period；
tI, min--- the vehicle moment is swum across under earliest in kth cluster；
A --- consider the adjusting parameter that starting loss introduces；
C13, k-th of cluster of extraction i.e. kth period cross vehicle time data collection by the vehicle in downstream:
Yk=X | Sk≤ti< Sk+1}
In formula, Yk--- the kth period crosses vehicle time data collection by the vehicle in downstream, passes through downstream stop line comprising each vehicle
Detection moment；
The stop frequency that effective vehicle is calculated in c2, specifically comprises the following steps:
C21, vehicle time data collection Y is crossed to the kth periodkEach of element ti, handed over respectively in upstream and downstream by its license plate number
The detected moment of prong calculates the journey time T that the vehicle passes through the section lK, iIf the license plate is also detected in upstream,
Then the vehicle is effective vehicle, is otherwise other vehicles；The journey time of effective vehicle are as follows:
In formula, TK, i--- i-th vehicle of kth period passes through the journey time in the section on the section l；
--- at the time of i-th vehicle of kth period passes through upstream stop line on the section l, wherein i=1,2,3 ... ..., Iup；
--- at the time of i-th vehicle of kth period passes through downstream stop line on the section l, wherein i=1,2,3 ... ...,
Idown；
C22, the effective vehicle data collection and other vehicle data collection for extracting the kth period:
Xk={ Yk|(Sk≤ti< Sk+1)∧(TK, i> 0) }
In formula, Xk--- effective vehicle data collection in kth period on the section l passes through downstream stop line comprising each effective vehicle
The journey time of detection moment and the vehicle；
Wk--- other vehicle data collection in kth period on the section l, the downstream vehicle that corresponding all upstreams are not detected include
Each other vehicles pass through the detection moment of downstream stop line；
C23, by effective vehicle data collection XkIn journey time TK, iHierarchical clustering is carried out, between class distance is taken as period C, gathers for D
The number of class, every one kind is d；Vehicle stop frequency having the same under d class number, enables the vehicle of d class is corresponding to stop
Train number number be S to get arrive each effective vehicle tiJourney time be TK, i, stop frequency SK, i；
The stop frequency that other vehicles are calculated in c3, includes the following steps:
C31, by comparing other vehicle data collection WkIn each vehicle and effective vehicle before and after it stop frequency, to this its
The stop frequency S of his vehicleK, iJudged:
In formula, SK, i--- the stop frequency of other vehicles of kth period, the vehicle belong to W on the section lk；
tbefore--- the effective vehicle of previous of kth period other vehicle datas spends the vehicle moment on the section l；
Sbefore--- the stop frequency of the effective vehicle of previous of kth period other vehicle datas on the section l；
tafter--- the effective vehicle of latter of kth period other vehicle datas spends the vehicle moment on the section l；
Safter--- the stop frequency of the effective vehicle of latter of kth period other vehicle datas on the section l；
The equal stop frequency of vehicle is calculated in c4, specifically:
When calculating the equal stop frequency of phase vehicle using phase as basic unit:
In formula,--- phase vehicle equal stop frequency of the phase p in the kth period on the section l；
SK, i--- the vehicle number that phase p passes through in the kth period on the section l；
N --- phase p passes through vehicle number in the kth period on the section l；It stops when calculating section vehicle using section as basic unit
When number:
In formula,--- section vehicle equal stop frequency of all phases in the kth period on the section l；
SK, i--- the stop frequency that phase p passes through vehicle in the kth period on the section l；
N1--- the vehicle number that all phase p pass through in the kth period on the section l；
When calculating vehicle equal stop frequency in intersection using intersection as basic unit:
In formula,--- intersection vehicle equal stop frequency of the corresponding all phases in intersection in the kth period；
SK, i--- the stop frequency that phase p passes through vehicle in the kth period on the section l；
N2--- the vehicle number that the corresponding all phases in intersection pass through in the kth period.
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| CN107331172B (en) * | 2017-08-25 | 2020-11-20 | 青岛海信网络科技股份有限公司 | Traffic phase adjusting method and device based on road traffic state |
| CN111815943B (en) * | 2019-04-11 | 2021-09-10 | 杭州海康威视数字技术股份有限公司 | Method, device and equipment for detecting vehicle parking times and storage medium |
| CN111114702B (en) * | 2019-12-13 | 2021-11-02 | 浙江大学 | Water floating equipment platform |
| CN114241776B (en) * | 2021-12-31 | 2023-01-31 | 连云港杰瑞电子有限公司 | Road section parking frequency dynamic estimation method based on rolling time window |
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