CN202887450U - Taxi anti-fake system - Google Patents

Abstract

The utility model relates to a taxi anti-fake system, comprising a camera, an image analyzer, a transmission network, an application server and a taxi database of a management department. The taxi anti-fake system dispenses with adding any device to taxis, can full-automatically operate, and provides effective information for the management department to inspect unlawfully-operating vehicles.

Description

A kind of taxi Antiforge system

Technical field

The utility model relates to a kind of taxi Antiforge system.

Background technology

Illegal operation taxi is commonly called as " illegal vehicle ", has not only upset normal passenger transport market operation order, has a strong impact on simultaneously the road traffic order and security, also very easily causes factors leading to social instability.A lot of profiles have appearred especially in recent years, color is equal " the clone car " similar with regular taxi height, bring very big difficulty for the inspection of law enforcement agency." based on design and the realization of the taxi anti-counterfeiting management system of REID " literary composition of Chinese periodical " computer utility " 32 volume the 1st phase the 284th to 287 page of publications in 2012 discloses a kind of by hiring out the identification Antiforge system that installs the RFID label additional, and this also is present modal technological means.But there is following obviously technological deficiency in this system:

(1) need operating personnel optionally to scan one by one vehicle by tag reader, efficient is lower;

(2) the RFID label is lost or power-fail easily, causes obvious flase drop;

(3) synchronization can only scan a zone, and is in many tracks and vehicle when more, undetected serious.

Summary of the invention

The utility model purpose is: a kind of taxi identification Antiforge system and method for processing based on intelligent image is provided.

The technical solution of the utility model is: a kind of taxi Antiforge system, it comprises the video camera that can catch pavement image, video camera is connected with image analyzer, and described image analyzer is connected the taxi database by transmission network and application management server and is connected with administrative authority.

Preferably, described image analyzer is loaded with taxi detection module, car plate identification module, vehicle tracking module and remote communication module; Described application management server be loaded with the anti-counterfeit recognition module and with the inspection communication interface modules of other auditing system; The taxi database of described administrative authority comprises taxi static database and taxi dynamic data base, taxi static data library storage license number of the taxi, human pilot, operator, the information such as whether scrap, the information such as whether taxi dynamic data library storage taxi telecommunication is online, current location.

Preferably, described video camera is digital high-definition camera, is fixed on the camera mount, and described camera mount can be L-type vertical rod or portal frame.When the road surface is wider, adopt side by side redundant all tracks of the complete covering of mode of installing of a plurality of video cameras, when ambient light illumination is too low, can adopt the light compensating lamp light filling, and synchronous by the camera control light compensating lamp.

Preferably, described taxi detection module comprises car plate locating module, ceiling light detection module, car body coating detection module, comprehensive distinguishing module; The car plate locating module is used for the license plate area of recognition image and cuts apart, and obtains the car plate coordinate; The ceiling light detection module is used for roof and whether has the zone that meets the taxi dome lamp sign; The car body coating detection module is used for determining body color distributes whether meet the distinctive application color of taxi; The comprehensive distinguishing module is used for car plate location, ceiling light detection and the car body coating testing result mode with probability statistics is integrated, and provides the differentiation result who whether meets the taxi resemblance.

The utility model has the advantages that:

1. the utility model need to not install any equipment additional at taxi, has saved system Construction and maintenance cost;

2. fully automatically operation of the utility model, but large scale deployment improves system monitoring density and efficient;

3. the utility model can link in real time with the out of Memory management system.

Description of drawings

Below in conjunction with drawings and Examples the utility model is further described:

Fig. 1 is system architecture synoptic diagram of the present utility model;

Fig. 2 is working-flow figure of the present utility model;

Fig. 3 is car plate locating module process flow diagram of the present utility model;

Fig. 4 is the car of the present utility model comprehensive distinguishing algorithm structure figure that hires a car;

Fig. 5 is car plate identification module process flow diagram of the present utility model.

Wherein: 1, video camera; 2, image analyzer; 3, camera mount; 4, application management server; 5, taxi static database; 6, taxi dynamic data base; 7, transmission network.

Embodiment

Embodiment: as shown in Figure 1, system is comprised of the front end system that is installed in trackside and the back-end system that is deployed in administrative center.Front end system mainly contains: video camera 1, image analyzer 2, camera mount 3; Back-end system mainly contains: application management server 4, taxi static database 5, taxi dynamic data base 6 and transmission network 7.

Video camera 1 adopts the wide temperature design of technical grade, sensor adopts 5,000,000 CCD, resolution is greater than 2592x1936, frame per second was not less than for 8 frame/seconds, and built-in gigabit ethernet interface is equipped with many moneys of 12mm ~ 25mm tight shot or zoom lens simultaneously, can guarantee effectively that like this monitored picture covers 3 tracks, and the license plate area pixel wide is no less than 80 pixels, can continuous effective catch many images when the vehicle speed per hour is no more than 80km/h simultaneously, satisfies the demand of general urban road.Image analyzer 2 adopts the built-in industrial control computer, and the integrated heat-dissipating casing of its shell does not need radiator fan, effectively prevents and treats inner laying dust, improves system stability; The configuration CPU frequency is not less than 2.4GHz, internal memory is no less than 4GB, save as outward and be no less than the 32GB solid state hard disc, above-mentioned configuration guarantees that image analyzer 2 has guaranteed the seismic stability of system when having enough calculating and storage resources to move all kinds of image processing algorithm.Camera mount 3 can adopt portal frame or L-type to choose arm support, and terrain clearance is between 6 ~ 8 meters, and cross bar length can guarantee that video camera 1 is in the centre in many tracks will monitoring simultaneously.

Application management server 4 is tower server, selects dominant frequency greater than four core processors of 2.8GHz, 8MB buffer memory, and internal memory is not less than 4GB, to guarantee still to guarantee the system responses real-time when disposing more image analyzer 2.Taxi static database 5, taxi dynamic data base 6 can provide according to each city existing system and form, inquire about by the remote access mode.Taxi static database 5 has been described the relevant static information of taxi, comprise: whether vehicle brand, affiliated operator, license plate number, application color, Pilot Name, engine mumber, driving license numbering, GPRS or other telecommunication equipment numbering and whether effective namely are eliminated.Taxi dynamic data base 6 has been described the taxi state, comprising: GPRS or other telecommunication equipment whether online, the GPS position coordinates that returns for the last time and time of return, current whether unloaded thereof.Transmission network 7 adopts optical fiber or 3G cordless communication network when cross-over connection front and back ends system, and front and back ends system this locality Ethernets that adopt based on twisted-pair feeder more.

Image analyzer 2, application management server 4, taxi static database 5, taxi dynamic data base 6 are realized interconnected by transmission network 7.

Principle of work of the present utility model is as follows:

Overall system workflow diagram of the present utility model is as shown in Figure 2:

Step S1: the image analyzer 2 rear automatic startup image analysis program that powers on, and completion system initial work: at first demarcation information and the configuration parameter of read local storage, if demarcate information spinner for the different line numbers of image, set corresponding car plate pixels across scope, gradient mean value threshold value, ceiling light color, the horizontal minimum of ceiling light and maximum pixel scope, application color and distribution, application pixels across scope; Configuration parameter comprises the distance of distance, ceiling light and the car plate of video camera 1 network address, geographic coordinate, the local store path of picture, surveyed area coordinate, car plate pixel wide scope, Special coating zone and car plate; Secondly set up UDP or TCP network connection and obtain running parameter with video camera 1, as the daytime/pattern of working at night, image true resolution, compressed format etc.; Start at last local data base, such as MySQL.

Step S2: video camera 1 sends view data after overcompression by the network connection set up frame by frame to image analyzer 2, compress mode can adopt the JPEG coding standard, comprises the additional informations such as clock that reflect the image acquisition moment, are accurate to millisecond in the Exif information header of every frame picture.

Step S3: after image analyzer 2 receives frame information from video camera 1, at first carry out the compression of images decoding, obtain the RGB component information of image, if video camera 1 output is the YUV component format, then needs to carry out again YUV and turn the RGB operation; Next starts the car plate finder and exports the car plate coordinate; Then start taxi dome lamp and taxi car body coating feature detection program, and ceiling light detection and car body coating detection computations result are inputed to the comprehensive distinguishing program, to determine whether as " doubtful taxi ".If be defined as " doubtful taxi " then enter step S4, otherwise return step S2.

Step S4: image analyzer 2 operation car plate recognizers, and with recognition result, be sent to application management server 4 together with video camera 1 coordinate, recognition time and image sectional drawing, image analyzer 2 returns step S2.

Step S5: after application management server 4 is received the information that image analyzer 2 sends, the car plate that at first identifies according to image analyzer 2 is index, retrieve the static database 5 of hiring a car, if this car plate does not exist or be invalid, then directly judge this car as illegal operation taxi and send warning information; Otherwise, this car plate exists, then continue to inquire the dynamic data base 6 of hiring a car, if this car now is in off-line state, or the air line distance of the gps coordinate that returns for the last time distance and present image analyser 2 differs from acquired results obviously greater than the theoretical velocity upper limit of city vehicle divided by returning for the last time gps coordinate and current time, such as 200km/h, then judge this car as illegal operation taxi and send warning information, otherwise think that this vehicle is regular operation taxi.

The car plate finder flow process of image analyzer 2 execution is as shown in Figure 3:

Step S201: read in RGB image information and demarcation information.

Step S202: the RGB image is changed into gray level image, and it calculates according to formula: Gray=| (R-B)+(G-B) |-| G-R|;

Step S203: calculate its gradient image on the gray level image basis, calculate and carry out according to the pixel maximal value of each pixel 3x3 neighborhood and the difference of minimum value;

Step S204: at first according to current scan pointer line number of living in, according to the demarcation information setting moving window that reads among the step S201, length of window equals the horizontal max pixel value of car plate, highly equals 1/3rd of length; Be then (how many slip spacings to calculate the gradient mean value of moving window in the line scanning mode?), if gradient mean value greater than the threshold value that reads among the step S201, then is labeled as the car plate position with the moving window current location, until the one's own profession end of scan; Behind the one's own profession end of scan, line number adds 1, if this moment, line number reached maximal value, then exports the car plate location parameter, continues scanning otherwise return step S204.

Taxi dome lamp detection algorithm step is:

Step S301: extract image characteristic region, namely at first image is carried out automatic threshold segmentation, utilize the half-tone information of image, the pixel of close gray scale is thought the same area, and next extracts zones all in the image, is designated as characteristic area;

Step S302: the roof lamp of standard has fixing shape, structure, color, these reference values that are used for contrast are obtained at step S1, the size of the characteristic area that obtains by statistic procedure S301 and color distribution and in the reference value contrast can be removed the zone that does not meet taxi dome lamp size or colour specification;

Step S303: because roof lamp is by different color regions, for example the most of background of roof lamp is blue, taxi company's name of upper adularescent or " TAXI " sign, relative position between these zones is fixed, be that taxi company's name or " TAXI " sign residing position in roof lamp is fixing and known, so the size in the color characteristic zone of extracting by determining step S301 and the relative position relation between the zone can be judged whether roof lamp of this color characteristic zone.Result of calculation provides in the probable value mode, namely the size in color characteristic zone and with the relative position relation in other color characteristic zones on every side more near the actual value of taxi dome lamp, then this zone is that the probable value of roof lamp is just larger, otherwise less.

Taxi car body coating detection algorithm step is:

Step S401: at first image is carried out automatic threshold segmentation, utilize the half-tone information of image, the pixel of close gray scale is thought the same area, and next extracts zones all in the image, is designated as characteristic area;

Step S402: the judging characteristic area size, remove the characteristic area that does not meet taxi application area size, characteristic area house label taking standard is determined by " the application pixels across scope " that read among the step S1;

Step S403: because a taxi external coating comprises multiple color usually, but the relative position between the regions of different colours is fixed, so size and the relative position relation between the zone in the color characteristic zone of extracting by step S401, S402 can judge further whether adjacent a plurality of characteristic areas meet the application color distribution of taxi.Result of calculation provides in the probable value mode, namely the size in color characteristic zone and with the relative position relation in other color characteristic zones on every side more near the actual value of taxi application, then this zone is that the probable value of taxi application is just larger, otherwise less.

After the probability results that has obtained the detection of car body coating and ceiling light, need to provide the conclusion judgement whether this car leases car after comprehensive both information, namely whether hire a car or public vehicles in car, it equally also is a classification problem, there is Various Classifiers on Regional available, this sentences Fig. 4, and to provide Naive Bayes Classifier be example explanation: vehicle is divided into " taxi " and " non-taxi " two classes, i.e. class variable; Car body coating, ceiling light are considered as characteristic variable.Model-naive Bayesian algorithm behaviour step is:

Step S501: be off-line training step, image analyzer 2 capturing sample image and demarcate vehicle whether taxi and car body coating, ceiling light zone under different illumination conditions forms the probability distribution of feature and the prior distribution of classification;

Step S502: be the ONLINE RECOGNITION stage, after image analyzer is by the eigenwert of calculating acquisition car plate specific position, car body coating, ceiling light zone, adopt Naive Bayes Classifier to calculate maximum a posteriori probability, obtain classification results, namely whether satisfy and hire out resemblance.

The car plate recognizer step of image analyzer 2 execution is as shown in Figure 5:

Step S601: the car plate maximum pixel scope according to the car plate location parameter that obtains among the step S204 and step S201 obtain is partitioned into the license plate area pixel from original RGB image;

Step S602: the license plate area image that step S601 obtains is done pre-service, and idiographic flow is:

(1) gray processing is processed, and can adopt weighted mean, establishes (the x of original color image, y) the pixel look of locating is RGB (x, y), its component is (R, G, B), then the gray-scale value of the correspondence position behind the gray processing is f (x, y)=(Wr*R+Wg*G+Wb*B)/3, and Wr, Wg, Wb are respectively the component weights, analyze according to the human eye vision degree, can be made as respectively 0.30,0.59,0.11.

(2) image enhancement processing can adopt contrast enhancing, histogram modification, image smoothing, image sharpening etc., the piecewise linear transform method explanation in herein strengthening based on contrast:

$g(x,y)=\left\{\begin{array}{cc}(c/a)f(x,y)& 0<=f\left(\mathrm{xy}\right)<=a\\ [(b-c)/(b-a)][f(x,y)-a]+c& a<=f\left(\mathrm{xy}\right)<=b\\ [(\mathrm{Mg}-d)/(\mathrm{Mf}-b)][f(x,y)-b]+b& b<=f\left(\mathrm{xy}\right)<=\mathrm{Mf}\end{array}\right.$

Wherein Mf and Mg are respectively the gray-scale value upper limit before and after processing, and a, b and c, d are respectively the waypoint before and after processing.

(3) image binaryzation is processed, and establishing binary-state threshold is Th, and then pixel value g ' (x, y) is as follows after the binaryzation:

$g^{\&prime;}(x,y)\left\{\begin{array}{cc}0& g(x,y)<\mathrm{Th}\\ 1& g(x,y)>=\mathrm{Th}\end{array}\right.$

(4) image filtering, commonly used have gaussian filtering, mean filter, medium filtering, Minimum Mean Square Error filtering, Gabor filtering, this sentences nonlinear filtering-medium filtering commonly used is the example explanation, step is: template (moving window that generally contains odd number point) is roamed in image range, and template center is overlapped with certain pixel location among the figure; Read the gray-scale value of each corresponding pixel in the template; These gray-scale values are arranged from small to large; Find a value in the middle of coming in these values; This intermediate value is assigned to the pixel of corresponding templates center;

Step S603: binary image is done projection in the horizontal direction, projection value is deducted the horizontal level greater than 0 is set as character zone after the noise average, obtain the border of separating character with this, the noise average can be obtained by direct demarcation mode;

Step S604: extract the various features of each character after cutting apart, form eigenmatrix; Characteristic element can for:

1) number of edges, the edge of a character of expression is communicated with the number of profile;

2) contour feature value uses the single order differential variation tendency definition of profile to consist of the elementary cell of character outline, be divided into left tiltedly, right tiltedly, straight line, circular arc, sudden change and uncertain etc.;

3) stroke number, up and down or left and right draws a straight line arbitrarily in a certain position of character, according to its number of times through white (the character track is black) zone character is divided;

4) projection is carried out vertically and the projection of horizontal direction character, and statistics is without the projection amount of position;

5) nose calculates vertically or the white line length of horizontal direction connected region, then finds out wherein long one, can find out in entire image also and can look in certain setting regions;

6) Area Ratio, calculate character area occupied in a certain setting regions, be mainly used in distinguishing such as 0, the characters such as D, O or Q, need to fill to white connected region the area of the black region after rear calculating is filled when quadraturing, and then calculate the area of white connected region, do obtaining described character area occupied after poor.

In actual applications, also have a lot of further feature information to utilize, but concrete list of references " design of Number-Plate Character Recognition algorithm ", " video technique is used and engineering ", 1002-8692(2007) 05-0088-03, author open and thank to China.The extraction of vehicle license plate characteristic belongs to those skilled in the art's known technology, repeats no more herein.

Step S605: use eigenmatrix as input, by trained sorter output character recognition result.

Have Various Classifiers on Regional available, such as support vector machine, Bayes, neural network etc., adopting the simplest nearest Euclidean distance herein is example, is about to eigenmatrix and Sample Storehouse and carries out Euclidean distance calculating, and nearest value is as a result of exported; The generation of Sample Storehouse is identical with step with step S604 method, and different only is that Data Source is the sample data of having demarcated, and repeats no more herein.

Certainly above-described embodiment only is explanation technical conceive of the present utility model and characteristics, and its purpose is to allow the people who is familiar with technique can understand content of the present utility model and according to this enforcement, can not limit protection domain of the present utility model with this.All modifications of doing according to the Spirit Essence of the utility model main technical schemes all should be encompassed within the protection domain of the present utility model.

Claims (3)

1. taxi Antiforge system, it is characterized in that: it comprises the video camera (1) that can catch pavement image, video camera (1) is connected with image analyzer (2), and described image analyzer (2) is connected with the taxi database with application management server (4) by transmission network (7).

2. taxi Antiforge system according to claim 1, it is characterized in that: described image analyzer (2) is loaded with taxi detection module, car plate identification module, vehicle tracking module and remote communication module; Described application management server (4) be loaded with the anti-counterfeit recognition module and with the inspection communication interface modules of other auditing system.

3. taxi Antiforge system according to claim 1, it is characterized in that: described video camera (1) is digital high-definition camera, be fixed on the camera mount (3), described camera mount (3) can be L-type vertical rod or portal frame, when the road surface is wider, adopt side by side redundant all tracks of the complete covering of mode of installing of a plurality of video cameras, when ambient light illumination is too low, can adopt the light compensating lamp light filling, and synchronous by the camera control light compensating lamp.

Images