CN102568202A - License plate sheltering detection system and detection method - Google Patents
License plate sheltering detection system and detection method Download PDFInfo
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- CN102568202A CN102568202A CN2011104400048A CN201110440004A CN102568202A CN 102568202 A CN102568202 A CN 102568202A CN 2011104400048 A CN2011104400048 A CN 2011104400048A CN 201110440004 A CN201110440004 A CN 201110440004A CN 102568202 A CN102568202 A CN 102568202A
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Abstract
The invention discloses a license plate sheltering detection system, which belongs to the field of intelligent transportation control and comprises a vehicle snap-shot location module (1), a processing module (3) and a license plate sheltering judgment module (2), wherein the vehicle snap-shot location module (1) is used for shooting vehicle images at detection positions and locating vehicle outlines in the snap-shot vehicle images, the processing module (3) is used for processing situations of spiteful sheltering of license plates, and the license plate sheltering judgment module (2) comprises a license plate location module (21), a license plate character analysis module (22) and a sheltering analysis module (23). The license plate location module (21) is used for locating license plate area in the snap-shot vehicle images, the license plate character analysis module (22) is used for determining appeared character positions and positions where deficiency characters may exist according to the appeared character positions in the license plate area, and the sheltering analysis module (23) judges whether spiteful sheltering exists or not according to textures of deficiency characters positions and enables judgment results to be sent to the processing module. The license plate sheltering detection system solves the technical problem that the existing detection system can not distinguish spiteful sheltering situations.
Description
Technical field
The invention belongs to the intelligent traffic control system field, particularly a kind of car plate occlusion detection system and detection method.
Background technology
License plate recognition technology is to use one of mode identification technology very widely in the intelligent transportation field; The non-at-scene system for detecting regulation violation of the present intelligent transportation industry overwhelming majority (as the electronic police monitoring systems of making a dash across the red light; Overspeed snapping system etc.) all be based on license plate recognition technology and realize automatic detection, automatically capture, identification and warehouse-in automatically automatically, be one of intelligentized technical foundation of traffic administration.
The technical foundation of license plate recognition technology is image processing techniques, character recognition technologies, the processing stage that license plate recognition technology being divided into four usually, i.e. and car plate location, Character segmentation, character recognition, car plate aftertreatment.Wherein:
The car plate locating module navigates to the car plate band of position from vehicle pictures; Comprise modes such as using character stroke gradient characteristic, car plate background color characteristic, textural characteristics; With obtain the most exactly, useful area is than (being the car plate actual area and the ratio of candidate region area) maximum license plate candidate area, and filter as far as possible and reduce wrong candidate region number.
The Character segmentation module is meant to be analyzed license plate candidate area, and location character is attempted using different car plate form location and cutting characters on license plate, chooses reasonable license board form division methods the most, and successfully isolates independent license number character.
Character recognition module is meant the single character picture of OCR (optical character identification) technology identification through obtaining after the Character segmentation that adopts in the area of pattern recognition, obtains the recognition result of single character.
The car plate post-processing module is meant the monocase recognition result (comprising candidate's recognition result and corresponding confidence level) that utilizes character recognition module; According to the car plate Rules Filtering and to be combined into confidence level the highest and meet the license number of characters on license plate rule criterion, method commonly used is to adopt critical path method (CPM) to realize.Through the combination and the processing of above four modules, can obtain the higher number-plate number recognition result of confidence level.
The license plate locating method that the license plate recognition technology that uses at present adopts is based on vehicle license plate characteristic mostly; The zone that promptly searching has vehicle license plate characteristic in image is as the candidate region; Reattempt and adopt the car plate rule of different-format that cutting is carried out in this zone; Thereby be partitioned into independent characters on license plate, send into the OCR character recognition module.Wherein most important vehicle license plate characteristic is a character feature, can distinguish other characters on license plate area and the vehicle body comparatively exactly, so that reduce the license plate area candidate blocks, improves locating speed.But the shortcoming of this method is: if car plate is blocked or partial occlusion, cause its character feature not obvious, then often cause the failure of license plate area location, occur situation about can't discern at last.And common in daily life malice is blocked the character feature that the behavior of car plate has exactly just in time reduced car plate; As use the scraps of paper or CD to block several numerals (being generally 1～3) of car plate; Then possibly cause the location failure, thereby can't recognize car plate at last.
In order to address the above problem, Chinese patent CN102156862A discloses a kind of anti-screening and has changed (block and alter) Vehicle License Plate Recognition System and recognition methods.At first utilize car plate the retroreflecting characteristics design a kind of active imaging and passive imaging system, realized the high bright demonstration of license plate area in the image, vehicle body, other background and screening change the low bright demonstration of material; Then, design a kind of anti-screening and change licence plate recognition method, realized hiding and changed the original sentence to not and character recognition.But this Vehicle License Plate Recognition System only uses image processing method that characters on license plate is cut apart, and blocks as not cutting apart then to be judged to be, and cuts apart successfully the back binary conversion treatment and then thinks greater than threshold value when 0 pixel and block, otherwise think unshielding.But this system can not distinguish malice and blocks with involuntary and block.The situation of being blocked by the front and back vehicle for car plate possibly cause the failure of car plate location because the car plate profile is blocked on the one hand, even car plate locate successfully on the other hand, lacked character also can to cause blocking the judgement of number not accurate enough owing to blocking; And for some damaged dirty car plates, also be mistaken for deliberately and block owing to can't be partitioned into characters on license plate.
Existing artificial malice is blocked the mode relative fixed that characters on license plate adopts, and commonly blocks with article such as CD, paper, plain cotton fabric back several to car plate.For common shielding mode and shelter, its textural characteristics is a relative fixed or clocklike.Therefore, applicant's situation of blocking characters on license plate to above-mentioned malice has proposed the present invention.
Summary of the invention
For this reason; Technical matters to be solved by this invention is that existing Vehicle License Plate Recognition System can not differentiate the problem that car plate malice is blocked, and then provides a kind of and can accurately detect several car plate occlusion detection system and the detection methods that the number-plate number is blocked by malice in back.
For solving the problems of the technologies described above, the invention discloses a kind of car plate occlusion detection system, it comprises, the vehicle snapshot locating module is used for capturing the vehicle image of monitoring location and navigates to vehicle ' s contour at the vehicle image of capturing; And processing module, be used for that malice is blocked the car plate situation and handle; Comprise that also car plate blocks judge module, car plate blocks judge module and comprises, the car plate locating module is used for navigating to license plate area at said vehicle ' s contour image; The characters on license plate analysis module according to the character feature that appears in the license plate area, confirms to appear character position and disappearance character possibility location; The sheltering analysis module judges whether that according to analyzing texture that the disappearance character maybe the location malice blocks; Judged result is delivered to said processing module.
The vehicle snapshot locating module comprises: the vehicle snapshot unit is used for the vehicle image that travels monitoring location is captured; Vehicle locating unit is used for navigating to the vehicle ' s contour position with capturing vehicle image.
Said car plate locating module navigates to license plate area according to the characters on license plate position that appears and the statistical value of car plate position in said vehicle ' s contour image.
Said characters on license plate analysis module comprises and appears the character position confirmation unit and lack the character position judging unit; The said character position confirmation unit that appears is used match search according to the textural characteristics of character and is navigated to and appear character position; Disappearance character position judging unit infers that according to position that appears character and standard characters on license plate form the disappearance character maybe the location.
The said character number that appears is 3-5, and it comprises the twoth of car plate at least.
Said processing module comprises warning device, is used for that malice is blocked the car plate situation and reports to the police.
The present invention discloses the detection method of the above-mentioned car plate occlusion detection of application system, it may further comprise the steps,
A. after the vehicle image that travels monitoring location being captured, in the vehicle image of capturing, navigate to vehicle ' s contour;
B. in said vehicle ' s contour image, navigate to license plate area;
C. according to the character feature that appears in the license plate area, confirm to appear character position and disappearance character possibility location;
D. judge whether that according to the textural characteristics of analyzing the disappearance character position malice blocks, said processing module is blocked car plate according to judged result to malice and is handled.
In said vehicle ' s contour image, navigate to license plate area through the car plate position that appears and the statistical value of car plate position among the step b.
The said processing module of steps d is blocked the car plate situation to malice and is reported to the police.Technique scheme of the present invention is compared prior art and is had the following advantages:
Car plate occlusion detection of the present invention system navigates to license plate area according to the characters on license plate position that appears and the statistical value of car plate position in said vehicle ' s contour image, the problem of location failure when it has avoided in the prior art realizing the location through vehicle license plate characteristic.And; The present invention is through analyzing the texture information at disappearance character position place; The textural characteristics of texture information and some types of common shelters is close, or the texture in a plurality of character disappearance zone is more approaching, then can judge the behavior that this car plate possibly exist malice to block basically.Avoided in the prior art, therefore, car plate occlusion detection of the present invention system is judging that malice is intelligent more than prior art aspect blocking.
Description of drawings
For content of the present invention is more clearly understood, below according to a particular embodiment of the invention and combine accompanying drawing, the present invention is done further detailed explanation, wherein
Fig. 1 is the system chart of car plate occlusion detection system.
Embodiment
Below will combine accompanying drawing, and use following examples that the present invention is further set forth.
Car plate occlusion detection of the present invention system is as shown in Figure 1, and it comprises,
Vehicle snapshot locating module 1 is used for capturing the vehicle image of monitoring location and navigates to vehicle ' s contour capturing vehicle image; Said vehicle snapshot locating module 1 comprises: vehicle snapshot unit 11 and vehicle locating unit 12.
Vehicle snapshot unit 11 is used for capturing at the image of the vehicle on road surface, monitoring point passing through.The function of this unit is in order to obtain clear, complete vehicle image, so that carry out follow-up occlusion detection and analysis.The mechanism of vehicle being carried out the image candid photograph has multiple; Common mode comprises that the ground induction coil triggering is captured, video analysis triggers and captures, radar triggers candid photograph etc.; This functional module is the collecting unit that total system is carried out the vehicle image of Treatment Analysis; Be the Data Source module, the similar functional module of use all arranged in based on the intelligent transportation system of license plate recognition technology at all.In native system, this module is not had special requirement, can directly use proven technique to realize the candid photograph of vehicle image.
Vehicle locating unit 12 navigates to the outline position of vehicle in the vehicle image of capturing.The function of this unit is in order from the panoramic picture of big resolution, to navigate to the particular location of target vehicle, and this position is the border with the appearance profile of vehicle basically, removes the influence that shade, vehicle block etc.Use is similar to the algorithm for pattern recognition that people's face detects, and carries out search matched through adopting contour of the vehicle template (template that mainly comprises preceding face of car or vehicle rear), in capturing image, navigates to vehicle location.There is multiple classic algorithm (like the pyramid search) can realize this function at area of pattern recognition.This module is not proposed special requirement in the native system, can directly use proven technique to realize the location of vehicle region.
This car plate occlusion detection system comprises that also car plate blocks judge module 2, and car plate blocks judge module 2 and comprises,
Car plate locating module 21, said car plate locating module navigate to said vehicle ' s contour according to the statistical value of car plate position that appears and car plate position the band of position of car plate suspension.The function of this module is the particular location that navigates to car plate comparatively exactly; This position needs to demarcate comparatively accurately license plate area; Should be limited in the outer rim position of actual license plate basically, not allow to occur bigger deviation or unnecessary zone, also not allow more serious disappearance.The car plate locating module is the key modules in the native system.Because what native system will solve is detection and the judgement that car plate blocks; Therefore for this module; Can not utilize the complete texture information in characters on license plate zone to realize to the car plate position calibration; But the situation of blocking car plate owing to malice under most of situation all is to adopt variety of way shield portions characters on license plate (as blocking last 1～3 of the number-plate number); Therefore still can utilize the texture information of remaining 3-5 part character, assist the location of realization according to statistical law (as for most dillies, head and afterbody car plate all are suspended on the centre position) simultaneously license plate area.And be not suspended on the situation in centre position for car plate, and can not find the characteristic of similar characters on license plate in the zone of statistical law, then abandon using statistical law, directly confirm the Probability Area of car plate according to the character position that reveals.
Characters on license plate analysis module 22 according to the character feature that appears in the license plate area, confirms to appear the position that possibly exist of character position and disappearance character; Said characters on license plate analysis module comprises and appears character position confirmation unit 221 and lack character position judging unit 222.
Saidly appear the position that character position confirmation unit 221 is used to confirm each character in the license plate area.This unit is based on the locating area of car plate locating module, search for character in the zone, and its main method is to utilize the textural characteristics of character, adopts the mode of match search to navigate to the characters on license plate position.The match search mode is meant that modes such as in the Probability Area of car plate, taking template matches, connected domain search confirms single characters on license plate; Block the car plate behavior for malice; Usually still having 3～5 characters appears; Adopt the particular location of searching for the characters on license plate that matching algorithm can confirm to reveal generally in the pattern-recognition, and confirm the car plate form according to the character position that reveals simultaneously.
Block the car plate behavior for malice; Modal shielding mode is to one or back two blocking after the number-plate number; For the character that reveals, character boundary, width can calculate mean value, and character pitch also can obtain; Through character boundary and the position relation that reveals, can confirm the car plate form.Because the 2nd, 3 character duration and the spacing between other differ bigger in the car plate, so as long as under the situation that the 2nd character exists, the position that appears character and disappearance character can both uniquely be confirmed.
As: last two when being blocked when characters on license plate, can be through the 2nd, 3 intercharacter spacings obviously greater than the unique definite car plate form of other intercharacter spacings; When the position that is blocked is positioned at the car plate centre position; For example the 3rd and the 5th is blocked; Then can through the 2nd with the 4th character between distance (its big certain proportion of distance between common two) and the 4th and the 6th; The relation of the distance between the 6th and the 7th then can be judged car plate form and position thereof.
Through above-mentioned processing, according to the car plate form and through appearing the characters on license plate position that the character position confirmation unit is confirmed, navigate to the regional location of " should exist " characters on license plate according to disappearance character position judging unit 222.This unit mainly is in order to locate the position of the character that is blocked probably, is the position of inferring the character that possibly be blocked through the position of car plate form and known character.
Also comprise sheltering analysis module 23, said sheltering analysis module 23 judges whether that according to the texture analysis in disappearance zone malice blocks car plate." should have character " that this module is promptly navigated to disappearance character position judging unit 222 but texture analysis is carried out in the zone that not have to detect " existing really " is because the character that is blocked of existence probably here.Extract its textural characteristics, this characteristic is inevitable (if difference is very little, then to be positioned as characters on license plate) greatly with the character feature difference.Because artificial malice is blocked the mode relative fixed that characters on license plate adopts, common there is CD to block, paper blocks, plain cotton fabric blocks etc.For common shielding mode and shelter, its textural characteristics is a relative fixed or clocklike.Close like detected textural characteristics in the sheltering analysis module (these textural characteristics all are positioned at the zone of " possibly have characters on license plate but do not detect character ") with the textural characteristics of some types of common shelters; Or the texture in a plurality of character disappearances zone is more approaching, then can judge the behavior that this car plate possibly exist malice to block basically.
This car plate occlusion detection system also comprises processing module 3, and said processing module 3 comprises warning device, is used for that malice is blocked the car plate situation and reports to the police.
The present invention discloses the detection method of the above-mentioned car plate occlusion detection of application system, it may further comprise the steps,
A. after the vehicle image that travels monitoring location being captured, in the vehicle image of capturing, navigate to vehicle ' s contour;
B. in said vehicle ' s contour image, navigate to license plate area through the car plate position that appears and the statistical value of car plate position;
C. according to the character feature that appears in the license plate area, confirm to appear character position and disappearance character possibility location;
D. judge whether that according to the textural characteristics of analyzing the disappearance character position malice blocks, said processing module is blocked car plate according to judged result to malice and is reported to the police.
Obviously, the foregoing description only be for explanation clearly done for example, and be not qualification to embodiment.For the those of ordinary skill in affiliated field, on the basis of above-mentioned explanation, can also make other multi-form variation or change.Here need not also can't give exhaustive to all embodiments.And conspicuous variation of being extended out thus or change still are among the protection domain of the invention.
Claims (9)
1. car plate occlusion detection system, it comprises,
Vehicle snapshot locating module (1) is used for capturing the vehicle image of monitoring location and navigates to vehicle ' s contour at the vehicle image of capturing;
And processing module (3), be used for that malice is blocked the car plate situation and handle; It is characterized in that:
Comprise that also car plate blocks judge module (2), car plate blocks judge module (2) and comprises,
Car plate locating module (21) is used for navigating to license plate area at said vehicle ' s contour image;
Characters on license plate analysis module (22) according to the character feature that appears in the license plate area, confirms to appear character position and disappearance character possibility location;
Sheltering analysis module (23) judges whether that according to analyzing texture that the disappearance character maybe the location malice blocks; Judged result is delivered to said processing module.
2. car plate occlusion detection according to claim 1 system is characterized in that:
Vehicle snapshot locating module (1) comprising:
Vehicle snapshot unit (11) is used for the vehicle image that travels monitoring location is captured;
Vehicle locating unit (12) is used for navigating to the vehicle ' s contour position with capturing vehicle image.
3. car plate occlusion detection according to claim 1 and 2 system is characterized in that:
Said car plate locating module (21) navigates to license plate area according to the characters on license plate position that appears and the statistical value of car plate position in said vehicle ' s contour image.
4. according to the arbitrary described car plate occlusion detection of claim 1-3 system, it is characterized in that:
Said characters on license plate analysis module (22) comprises and appears character position confirmation unit (221) and lack character position judging unit (222);
The said character position confirmation unit (221) that appears is used match search according to the textural characteristics of character and is navigated to and appear character position;
Disappearance character position judging unit (222) infers that according to position that appears character and standard characters on license plate form the disappearance character maybe the location.
5. car plate occlusion detection according to claim 4 system is characterized in that:
The said character number that appears is 3-5, and it comprises the twoth of car plate at least.
6. according to the arbitrary described car plate occlusion detection of claim 1-5 system, it is characterized in that:
Said processing module (3) comprises warning device, is used for that malice is blocked the car plate situation and reports to the police.
7. an application rights requires the detection method of the arbitrary said car plate occlusion detection of 1-6 system, and it is characterized in that: it may further comprise the steps,
A. after the vehicle image that travels monitoring location being captured, in the vehicle image of capturing, navigate to vehicle ' s contour;
B. in said vehicle ' s contour image, navigate to license plate area;
C. according to the character feature that appears in the license plate area, confirm to appear character position and disappearance character possibility location;
D. judge whether that according to the textural characteristics of analyzing the disappearance character position malice blocks, said processing module is blocked car plate according to judged result to malice and is handled.
8. car plate occlusion detection method according to claim 7 is characterized in that:
In said vehicle ' s contour image, navigate to license plate area through the car plate position that appears and the statistical value of car plate position among the step b.
9. car plate occlusion detection method according to claim 7 is characterized in that:
The said processing module of steps d is blocked the car plate situation to malice and is reported to the police.
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| CN106203422B (en) * | 2016-06-28 | 2019-05-07 | 北京智芯原动科技有限公司 | License plate shading detection method and device based on hsv color space |
| CN106358019A (en) * | 2016-09-30 | 2017-01-25 | 北京中星微电子有限公司 | Intelligent monitoring method and system for license plate number coverage |
| CN107977596A (en) * | 2016-10-25 | 2018-05-01 | 杭州海康威视数字技术股份有限公司 | A kind of car plate state identification method and device |
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| CN108021915A (en) * | 2017-12-25 | 2018-05-11 | 重庆冀繁科技发展有限公司 | The anti-detection method of license plate blocked |
| CN109035797A (en) * | 2018-09-03 | 2018-12-18 | 科大国创软件股份有限公司 | A kind of screening board vehicle identification system and method based on Beidou location data |
| CN110020669A (en) * | 2019-03-04 | 2019-07-16 | 珠海亿智电子科技有限公司 | A kind of license plate classification method, system, terminal device and computer program |
| CN110399943A (en) * | 2019-07-11 | 2019-11-01 | 中国地质大学（北京） | A kind of electronic license plate data decoding processing method and electronic license plate read-write equipment |
| CN110399943B (en) * | 2019-07-11 | 2020-07-24 | 中国地质大学（北京） | Electronic license plate data decoding processing method and electronic license plate reading and writing equipment |
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