CN103077610A - Road trip time estimating method and system - Google Patents
Road trip time estimating method and system Download PDFInfo
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- CN103077610A CN103077610A CN201210593751XA CN201210593751A CN103077610A CN 103077610 A CN103077610 A CN 103077610A CN 201210593751X A CN201210593751X A CN 201210593751XA CN 201210593751 A CN201210593751 A CN 201210593751A CN 103077610 A CN103077610 A CN 103077610A
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Abstract
The invention provides a road trip time estimating method and a road trip time estimating system, wherein the method comprises the following steps that the vehicle passing information in the set time is collected at an upstream tollgate and a downstream tollgate, in addition, the license plate matching is carried out, and the vehicle trip time information set is obtained; the vehicle trip time information set is subjected to data preprocessing; the preprocessed time information set is subjected to distribution test for judging the distribution mode; and the road trip time estimating value is calculated according to the judged distribution mode. The method and the system have the advantages that the intelligent degree is high, the operation is simple and convenient, and the objective degree and the accuracy of calculation results are high.
Description
Technical field
The invention belongs to urban road intelligent traffic administration system and information service field, particularly a kind of method and system of highway section estimation hourage.
Background technology
In recent years, China's urban traffic management level improves constantly, simultaneously, for effectively managing all kinds of traffic violations, at present the numerous cities of China in the urban signal controlling crossing or the highway section a large amount of comprehensive illegal monitoring systems has been installed, and along with the development of video technique, these comprehensive illegal monitoring systems are when carrying out the illegal activities candid photograph, can use as the road bayonet socket that is dispersed in the city simultaneously, can record all by the relevant information of the vehicle at crossing, mainly comprise: the license plate number of identification, by the time at crossing, vehicle turns to the crossing, speed etc.
Simultaneously, road section is the important component part in the Traveler Information service system hourage, can effectively improve the traveler travel behaviour and improve the trip comfortableness for traveler provides hourage current or that estimate.But under Current City Road traffic flow detection means, has larger difficulty the hourage that obtains in real time whole highway sections.
Therefore, for the urban traffic information service system, how to realize a major issue estimating to have become urban road intelligent traffic administration system and information service hourage effective, robotization at present.
Summary of the invention
The object of the invention is to, provide a kind of and can realize the Real-time Collection Urban road technology of hourage, lack a large amount of real time data supports in the solution prior art and obtain the Urban road problem of hourage.
To achieve these goals, demand for Urban road estimation hourage, one object of the present invention is to propose a kind of easy objective highway section method of estimation hourage, and another object of the present invention is to propose a kind of easy objective highway section estimating system hourage
Method according to estimate highway section hourage of the embodiment of the invention comprises: gather in the schedule time by the information of vehicle at upstream bayonet socket and downstream bayonet socket, the driving board coupling of going forward side by side obtains vehicle journeys temporal information collection; Described vehicle journeys temporal information collection is carried out the data pre-service; Pretreated described temporal information collection is carried out distribution inspection to judge distribution pattern; And according to the described distribution pattern of judging, calculate highway section estimated value hourage.
In one embodiment of the invention, describedly carry out the data pre-service and comprise: the noise data that utilizes quartile according to screening method described vehicle journeys temporal information to be concentrated screens out.
In one embodiment of the invention, the described distribution inspection of carrying out comprises to judge distribution pattern: utilize whether a kind of in default distribution of probability distribution function that Chi-square Test checks information hourage.
In one embodiment of the invention, described default distribution comprises that normal distribution, lognormal distribution, gamma distribute and Weibull distribution.
System according to estimate highway section hourage of the embodiment of the invention comprises: collecting unit, described collecting unit are used for gathering in the schedule time information by vehicle at upstream bayonet socket and downstream bayonet socket; Car plate Data Matching unit, described car plate Data Matching unit are used for carrying out the car plate coupling, obtain vehicle journeys temporal information collection; Data pretreatment unit, described data pretreatment unit are used for described vehicle journeys temporal information collection is carried out the data pre-service; Distribution inspection unit, described distribution inspection unit are used for pretreated described temporal information collection is carried out distribution inspection to judge distribution pattern; And hourage computing unit, described hourage, computing unit was used for calculating highway section estimated value hourage according to the described distribution pattern of judging.
In one embodiment of the invention, described data pretreatment unit utilizes quartile according to screening method the concentrated noise data of described vehicle journeys temporal information to be screened out.
In one embodiment of the invention, whether be a kind of in default distribute to the Chi-square Test of described distribution inspection unit by using if checking the probability distribution function of information hourage.
In one embodiment of the invention, described default distribution comprises that normal distribution, lognormal distribution, gamma distribute and Weibull distribution.
The present invention is based on existing ripe traffic control system, its data are carried out deep excavation and multiplexing, and computation process is easy, robotization, intelligent degree are high, have advantages of satisfy online real-time operation, the objective degree accuracy of result of calculation is high.
Additional aspect of the present invention and advantage in the following description part provide, and part will become obviously from the following description, or recognize by practice of the present invention.
Description of drawings
Above-mentioned and/or additional aspect of the present invention and advantage are from obviously and easily understanding becoming the description of embodiment in conjunction with following accompanying drawing, wherein:
Fig. 1 is the process flow diagram of the method estimated highway section hourage of the embodiment of the invention; With
Fig. 2 is the structural representation of the system that estimates highway section hourage of the embodiment of the invention.
Embodiment
The below describes embodiments of the invention in detail, and the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or the element with identical or similar functions from start to finish.Be exemplary below by the embodiment that is described with reference to the drawings, be intended to for explaining the present invention, and can not be interpreted as limitation of the present invention.
In description of the invention, it will be appreciated that, term " " center "; " vertically "; " laterally "; " length "; " width "; " thickness ", " on ", D score, " front ", " afterwards ", " left side ", " right side ", " vertically ", " level ", " top ", " end " " interior ", " outward ", " clockwise ", orientation or the position relationship of indications such as " counterclockwise " are based on orientation shown in the drawings or position relationship, only be for convenience of description the present invention and simplified characterization, rather than device or the element of indication or hint indication must have specific orientation, with specific orientation structure and operation, therefore can not be interpreted as limitation of the present invention.
In addition, term " first ", " second " only are used for describing purpose, and can not be interpreted as indication or hint relative importance or the implicit quantity that indicates indicated technical characterictic.Thus, one or more these features can be expressed or impliedly be comprised to the feature that is limited with " first ", " second ".In description of the invention, the implication of " a plurality of " is two or more, unless clear and definite concrete restriction is arranged in addition.
In the present invention, unless clear and definite regulation and restriction are arranged in addition, broad understanding should be done in the terms such as term " installation ", " linking to each other ", " connection ", " fixing ", for example, can be to be fixedly connected with, and also can be to removably connect, or connect integratedly; Can be mechanical connection, also can be to be electrically connected; Can be directly to link to each other, also can indirectly link to each other by intermediary, can be the connection of two element internals.For the ordinary skill in the art, can understand as the case may be above-mentioned term concrete meaning in the present invention.
In the present invention, unless clear and definite regulation and restriction are arranged in addition, First Characteristic Second Characteristic it " on " or D score can comprise that the first and second features directly contact, can comprise that also the first and second features are not directly contacts but by the other feature contact between them.And, First Characteristic Second Characteristic " on ", " top " and " above " comprise First Characteristic directly over Second Characteristic and oblique upper, or only represent that the First Characteristic level height is higher than Second Characteristic.First Characteristic Second Characteristic " under ", " below " and " below " comprise First Characteristic under the Second Characteristic and tiltedly, or only represent that the First Characteristic level height is less than Second Characteristic.
As shown in Figure 1, the method according to estimate highway section hourage of the embodiment of the invention may further comprise the steps:
S1. in upstream bayonet socket and downstream bayonet socket gather the schedule time by the information of vehicle, the driving board coupling of going forward side by side obtains vehicle journeys temporal information collection.
Particularly, as a two-way highway section, then the highway section of one of them direction also is the basic research object of this method as unidirectional highway section with the road between the section of two installing card port systems.For a unidirectional highway section, its upstream section is A, and the downstream section is B, with a certain determining time (such as 15 minutes) as a research cycle.When each time period finishes, collect all car plate data of within this time period, passing through the vehicle of B section, pass through the moment, section information etc., form information of vehicles collection b.Integrate b as on the basis with vehicle, appear at the record in the bayonet socket database of A section with the vehicle among the searching vehicle collection b in the mode of the car plate comparison bayonet socket database before A this moment of section, and will pass by the vehicle registration information that in the certain hour all appear among the vehicle collection b in the A profile data storehouse and extract, mainly comprise the moment through the A section.With comparing in the moment that B, A section pass through through the vehicle by the B section behind the A section first of extracting, namely mate, can obtain each car through the required time information set a in the unidirectional highway section of AB.Need to prove, for the car plate coupling, if there is the mistiming between the record that records and mate to meet the following conditions: 1. the downstream time is later than the upstream time; 2. the upstream and downstream mistiming then mates one by one for such record in a rational interval, also illustrates that this vehicle has passed through continuously these two bayonet sockets or detected section simultaneously.
S2. vehicle journeys temporal information collection is carried out the data pre-service.The temporal information collection a that namely obtains for step S1 utilizes the quartile method to carry out the rejecting of abnormal data, removes obviously to represent the vehicle journeys time numerical value of unidirectional highway section AB in the past period.
Particularly, can obtain by the vehicle matched data between certain highway section or certain two bayonet socket section by step S1, these data have following attribute: car plate, through crossing, the upstream time, through the downstream road junction time, crossing, upstream numbering, the downstream road junction numbering, track, vehicle.Products for further is processed in the middle of these data being stored in the internal memory of pretreatment unit.Concrete grammar is as follows: for each the bar matched record when vehicle, calculate the mistiming between the upstream and downstream bayonet socket, as a new field store in internal storage data before.Each bar matched record to this highway section is all carried out this processing.Subsequently, according to facture, the record that the mistiming field data is not met screening criteria screens out as noise data by quartile.The specific algorithm of quartile method is as follows:
Z=[Q
0.25-1.5R,Q
0.75+1.5R]
R=Q
0.75-Q
0.25
In above two formulas, Z represents effective data intervals, and the mistiming numerical value not data in this interval all will be screened out Q
0.25, Q
0.75Be respectively upper and lower quartile value, R represents the quartile extreme difference.At last remaining matched record is stored in the database as this highway section effective video identification record, to treat further processing.
S3. pretreated temporal information collection is carried out distribution inspection to judge distribution pattern.
Particularly, for distribution inspection, the method is: the data pretreatment unit is processed the data that obtain, imported to the distribution inspection unit.The hypothesis of the probability density distribution of Chi-square Test hourage is used in this unit by using matlab language compiling.Null hypothesis:
H
0: hourage, the probability density function of t satisfied certain concrete distribution form.
Then choosing certain test of hypothesis standard goes checking whether to accept null hypothesis.
The method of test of hypothesis commonly used has: u-test method, t method of inspection, χ
2Method of inspection, F method of inspection, rank test etc.Based on the form of probability to be tested of choosing previously, the method for test of hypothesis is chosen χ
2Method of inspection.χ
2Statistic:
O in the formula
iObserved frequency, E
iIt is certain distributed expecterd frequency.
When sample size is enough large, above-mentioned χ
2Statistic satisfies approximate χ
2Distribute.The standard of test of hypothesis:
If
The time, then under level of significance α, refuse H
0, otherwise accept H
0 
Can be from χ
2Read in the form of value, wherein, α is level of significance, generally is taken as 0.05; V is χ
2The degree of freedom that distributes.
S4. according to the distribution pattern of judging, calculate highway section estimated value hourage.
Particularly, for calculating hourage, the assay according to above-mentioned test of hypothesis obtains in conjunction with corresponding estimated parameter, can calculate hourage, and concrete algorithm is as follows:
Normal distribution:
Mean=μ,Variance=σ
2
Lognormal distribution:
Gamma distributes:
Mean=ab,Variance=ab
2
Weibull distribution:
Mean=a[Γ(1+b
-1)],Variance=a
2[Γ(1+2b
-1)-Γ(1+b
-1)
2]
Need to prove, if the assay of step S3 is to meet certain distribution, then utilize the hourage in the highway section that the method for asking expectation value of this distribution asks, if because data volume is very few and can't carry out match, the expectation value of then directly using the method for normal distribution to ask is used as highway section hourage.
The method of estimating highway section of the present invention hourage has that Computing Principle is clear, degree of intelligence is high, and is easy and simple to handle, portable strong, the high advantage of the objective degree accuracy of result of calculation.
As shown in Figure 2, the system that estimates according to highway section hourage of the embodiment of the invention comprises: collecting unit 100, car plate Data Matching unit 200, data pretreatment unit 300, distribution inspection unit 400 and hourage computing unit 500.
Particularly, collecting unit 100 is used for gathering in the schedule time information by vehicle at upstream bayonet socket and downstream bayonet socket; Car plate Data Matching unit 200 is used for carrying out the car plate coupling, obtains vehicle journeys temporal information collection; Data pretreatment unit 300 is used for vehicle journeys temporal information collection is carried out the data pre-service; Distribution inspection unit 400 is used for pretreated temporal information collection is carried out distribution inspection to judge distribution pattern; The distribution pattern that hourage, computing unit 500 was judged for basis is calculated highway section estimated value hourage.
In one embodiment of the invention, data pretreatment unit 300 utilizes quartile according to screening method the concentrated noise data of vehicle journeys temporal information to be screened out.
In one embodiment of the invention, whether be a kind of in default distribute in distribution inspection unit 400 if utilizing Chi-square Test to check the probability distribution function of information hourage.
In one embodiment of the invention, default distribution comprises that normal distribution, lognormal distribution, gamma distribute and Weibull distribution.
The system that estimates highway section of the present invention hourage have implement simple, real-time is high, robotization, intelligent degree are high, simple installation, compatible strong, easy and simple to handle, the high advantage of the objective degree accuracy of result of calculation.
For making those skilled in the art understand better the present invention, the below chooses a highway section and is described as example.
The data of (on 06 16th, 2011) are studied now to choose one day from data with existing.Road section selected is " brilliant bridge east-〉 Yongan Li Dong overline bridge ", and highway section length is 1600 meters, belongs to city expressway.The data that mate the hourage in this highway section in this day are as shown in the table.
Table 1 vehicle journeys temporal information collection form
| ID | Car plate | Entrance ID | Entry time | Outlet ID | The outlet time | Time spent (S) |
| 1308154035140_4 | Capital BJ99** | 5013 | 2011/6/16?0:00:01 | 5003 | 2011/6/16?0:00:01 | 101 |
| 1308154035140_28 | Capital BM38** | 5013 | 2011/6/16?0:00:14 | 5003 | 2011/6/16?0:00:14 | 102 |
| 1308154035156_89 | Capital BL40** | 5013 | 2011/6/16?0:00:43 | 5003 | 2011/6/16?0:00:43 | 109 |
| 1308154035156_74 | Capital GC08** | 5013 | 2011/6/16?0:00:52 | 5003 | 2011/6/16?0:00:52 | 91 |
| 1308154155078_18 | Capital J917** | 5013 | 2011/6/16?0:02:08 | 5003 | 2011/6/16?0:02:08 | 103 |
| 1308154155078_25 | Capital MX23** | 5013 | 2011/6/16?0:02:17 | 5003 | 2011/6/16?0:02:17 | 97 |
| 1308154155078_62 | Capital BM75** | 5013 | 2011/6/16?0:02:32 | 5003 | 2011/6/16?0:02:32 | 98 |
| 1308154155093_154 | Capital JX62** | 5013 | 2011/6/16?0:03:27 | 5003 | 2011/6/16?0:03:27 | 98 |
| 1308154155093_177 | Capital BJ22** | 5013 | 2011/6/16?0:03:40 | 5003 | 2011/6/16?0:03:40 | 97 |
| ...... | ...... | ...... | ...... | ...... | ...... | ...... |
Consider that be different different hourages constantly in the road driving of reality, but can think unlikely the hourage of the vehicle within the shorter time period and differ too large, if differ too large, for example arranged obviously above other vehicles the hourage of indivedual vehicles, can think that then this vehicle because the problems such as parking cause hourage long, does not represent the hourage in this highway section.Get 15 minutes here as the time period of determining, within 15 minutes, use the quartile method and carry out the processing of data.
On the data basis after the processing, estimate application distribution check and hourage, obtain per 15 minutes distribution form in this highway section, average hourage and variance, following table is for once to estimate every 15 minutes in the data of the 6:00-12:00 on June 16 selected road, (25-48 numbering representative be per 15 minutes period of 6:00-12:00) comprises the estimation of distribution form, hourage parameter.
The distribution pattern in table 2 highway section and estimates of parameters
| Time period | Distribution form | T（s） | Sigma |
| 25 | 1 | 101.839 | 2.93433 |
| 26 | 3 | 105.385 | 8.65181 |
| 27 | 3 | 119.248 | 9.57473 |
| 28 | 1 | 135.984 | 3.06143 |
| 29 | 3 | 140.539 | 12.197 |
| 30 | 1 | 142.842 | 3.91196 |
| 31 | 3 | 122.651 | 9.74012 |
| 32 | 2 | 125.881 | 9.04943 |
| 33 | 3 | 133.803 | 13.2904 |
| 34 | 1 | 127.73 | 3.32183 |
| 35 | 3 | 121.618 | 8.10597 |
| 36 | 3 | 129.357 | 12.6305 |
| 37 | 2 | 140.108 | 14.2286 |
| 38 | 4 | 209.757 | 44.9522 |
| 39 | 3 | 210.731 | 35.071 |
| 40 | 1 | 198.804 | 4.80519 |
| 41 | 3 | 143.969 | 19.5725 |
| 42 | 2 | 133.504 | 21.6559 |
| 43 | 2 | 116.709 | 9.89332 |
| 44 | 3 | 117.43 | 10.4772 |
| 45 | 2 | 113.801 | 12.0441 |
| 46 | 2 | 112.447 | 9.42264 |
| 47 | 2 | 107.657 | 8.50931 |
| 48 | 3 | 106.789 | 7.87982 |
Annotate: distribution form, 1 represents normal distribution; 2 represent lognormal distribution; 3 represent Gamma distributes; 4 represent Weibull distributes; 0: represent countless certificates in this time period.
Can obtain average hourage of the estimated value of each period from upper table.
Need to prove, describe and to be understood in the process flow diagram or in this any process of otherwise describing or method, expression comprises the module of code of the executable instruction of the step that one or more is used to realize specific logical function or process, fragment or part, and the scope of preferred implementation of the present invention comprises other realization, wherein can be not according to order shown or that discuss, comprise according to related function by the mode of basic while or by opposite order, carry out function, this should be understood by the embodiments of the invention person of ordinary skill in the field.
In the description of this instructions, the description of reference term " embodiment ", " some embodiment ", " example ", " concrete example " or " some examples " etc. means to be contained at least one embodiment of the present invention or the example in conjunction with specific features, structure, material or the characteristics of this embodiment or example description.In this manual, the schematic statement of above-mentioned term not necessarily referred to identical embodiment or example.And the specific features of description, structure, material or characteristics can be with suitable mode combinations in any one or more embodiment or example.
Although the above has illustrated and has described embodiments of the invention, be understandable that, above-described embodiment is exemplary, can not be interpreted as limitation of the present invention, those of ordinary skill in the art is not in the situation that break away from principle of the present invention and aim can change above-described embodiment within the scope of the invention, modification, replacement and modification.
Claims (8)
1. the method for highway section estimation hourage is characterized in that, comprising:
By the information of vehicle, the driving board coupling of going forward side by side obtains vehicle journeys temporal information collection in upstream bayonet socket and downstream bayonet socket gather the schedule time;
Described vehicle journeys temporal information collection is carried out the data pre-service;
Pretreated described temporal information collection is carried out distribution inspection to judge distribution pattern; And
According to the described distribution pattern of judging, calculate highway section estimated value hourage.
2. method as claimed in claim 2 is characterized in that, describedly carries out the data pre-service and comprises: the noise data that utilizes quartile according to screening method described vehicle journeys temporal information to be concentrated screens out.
3. such as claim 1 and 2 described methods, it is characterized in that, the described distribution inspection of carrying out comprises to judge distribution pattern: utilize whether a kind of in default distribution of probability distribution function that Chi-square Test checks information hourage.
4. such as the described method of claim 1-3, it is characterized in that, described default distribution comprises that normal distribution, lognormal distribution, gamma distribute and Weibull distribution.
5. the system of highway section estimation hourage is characterized in that, comprising:
Collecting unit, described collecting unit are used for gathering in the schedule time information by vehicle at upstream bayonet socket and downstream bayonet socket;
Car plate Data Matching unit, described car plate Data Matching unit are used for carrying out the car plate coupling, obtain vehicle journeys temporal information collection;
Data pretreatment unit, described data pretreatment unit are used for described vehicle journeys temporal information collection is carried out the data pre-service;
Distribution inspection unit, described distribution inspection unit are used for pretreated described temporal information collection is carried out distribution inspection to judge distribution pattern; And
Hourage computing unit, described hourage, computing unit was used for calculating highway section estimated value hourage according to the described distribution pattern of judging.
6. method as claimed in claim 6 is characterized in that, the noise data that described data pretreatment unit utilizes quartile according to screening method described vehicle journeys temporal information to be concentrated screens out.
7. such as claim 5 and 6 described methods, it is characterized in that, whether the probability distribution function of information hourage is checked in the Chi-square Test of described distribution inspection unit by using is a kind of in default the distribution.
8. such as the described method of claim 5-7, it is characterized in that, described default distribution comprises that normal distribution, lognormal distribution, gamma distribute and Weibull distribution.
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