CN1420041A - Embedded integrative vehicle licensing plate distinguishing apparatus - Google Patents
Embedded integrative vehicle licensing plate distinguishing apparatus Download PDFInfo
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- CN1420041A CN1420041A CN01139959A CN01139959A CN1420041A CN 1420041 A CN1420041 A CN 1420041A CN 01139959 A CN01139959 A CN 01139959A CN 01139959 A CN01139959 A CN 01139959A CN 1420041 A CN1420041 A CN 1420041A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V20/00—Scenes; Scene-specific elements
- G06V20/60—Type of objects
- G06V20/62—Text, e.g. of license plates, overlay texts or captions on TV images
- G06V20/63—Scene text, e.g. street names
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Abstract
An embedded integrated recognizer for the license plates of cars is characterized by use of OCR and image matching techniques. It has the automatic lighting unit used at night. Its hardware uses the DSP chip as the recognition algorithm platform. Its lighting unit, lens, camera head and hardware circuit are integrated. Its advantages are high recognizing power, high adaptability and easy installation.
Description
Affiliated field
The present invention is a number plate recognition equipment, belongs to area of pattern recognition.
Background technology
Intelligent transportation system (ITS) is a notion that produces recently, refers to that computer technology and conventional traffic management process combine, and realizes the automation or the area of computer aided of conventional traffic management project, perhaps expands the management project that is difficult to realize in some conventional traffic.Because license plate is the most important means of differentiating, registering, manage automobile, number plate recognition just becomes the gordian technique and the basis of intelligent transportation system.Other number plate recognition system adopts " camera-capture card-computing machine (industrial computer) " structure substantially in the market, is actually the combination of identification software and general image equipment.This system architecture complexity, with high costs, inconvenience is installed, difficult in maintenance; The operation of software needs the support of operating system, has reduced the stability of system.The number plate recognition system need move under different illumination conditions, and light adaptation must be arranged.What legacy system adopted is all-purpose camera, its mode with an automatic light meter can be that human eye is accepted as purpose with image, but not aims at car plate identification design-calculated, is not suitable for car plate identification under some specific environment, the car plate of this period can't be discerned, influence the general effect of total system.
Summary of the invention
1. the present invention has adopted embedded, incorporate architecture.As shown in Figure 1, the system integration picture pick-up device module, image capture module, number plate recognition module, interface module, lighting circuit and control center.Picture pick-up device is exported 8 bit image gradation datas and row, field, Dot Clock signal in real time, and identifying apparatus receives after the energizing signal, and control center's order image capture module is gathered the image of present frame; Image capture module will arrive a complete field picture gradation data at first according to synchronizing signal and be recorded in the memory device, notify control center " collection finishes " then; Control center gives the number plate recognition module with data bus and uses, order it to begin to handle, the number plate recognition module identifies number and license plate image from raw image data, store with ASCII character form and jpeg format in memory device respectively, notifies control center " identification finishes " then; Control center promptly handles interface module picture and number data is organized into the message that can supply serial ports to send, and sends to user software or system, finishes whole identification process.All these modules are integrated in together, and the user need not to equip miscellaneous equipments such as pick up camera, capture card just can obtain final identification result.Control center also obtains the feedback of image exposure level from the number plate recognition module, the shutter speed of picture pick-up device is automatically adjusted, and starts illumination in case of necessity, gives light filling.
2. the present invention adopts " licence plate effect mode of priority " to realize digital dimming.The light adjusting circuit structure is as shown in Figure 2: in picture pick-up device, the CCD imager chip is the major equipment of pick up camera, it changes light intensity signal into voltage signal by the electric charge coupled modes, and the synchronizing information of some expression photosensitive sites that superpose, and forms analog video signal; The CCD control chip generates some clock signals that the imager chip normal operation needs, and can set the working parameter of imager chip, comprises aperture time, gain control.Control chip provides the external control signal interface, can be by sc pin control shutter; Micro controller system is controlled analog switch s1 and s2 respectively by two pin p1, p2 signal, to reach the purpose of adjusting exposure, when exposure is suitable, p1 and p2 be output low level, analog switch s1, s2 end, the voltage of sc end is exactly to be produced by resistance R 1 and R2 dividing potential drop, and aperture time remains unchanged; When p1 output high level, the s1 conducting, the sc point voltage is pulled to power supply VCC, and aperture time slows down, and exposing quantity increases; When p2 output high level, the s2 conducting, the sc point voltage is pulled to ground wire GND, and aperture time is accelerated, and exposing quantity reduces; P1 and p2 can not be high simultaneously.Shooting control micro controller system and mainboard dsp system have serial communication channel, can obtain exposure information from mainboard, realize the adjusting of CCD exposing quantity.After the mainboard dsp system obtains digital image, at first orient the zone of car plate, then to this area image degree of comparing and monochrome information, be unfavorable for discerning the number-plate number if find the car plate picture, then further analyze reason, promptly be because exposure excessively or underexposure, sends corresponding light modulation instruction by serial channel to shooting control micro controller system then.
The advantage of integral structure of the present invention is:
A. convenient for installation and maintenance: this identifying apparatus is a single-piece product, and the user only need be fixed in and use on-the-spot getting final product, and both need not to install miscellaneous equipment, does not also need the driving of other software;
B. reliability height: the present invention is a dedicated system, and has adopted multinomial trouble prevention and from recovery measure, the mean time between failures reaches 20000 hours.
C. low-cost, low-power consumption.
Description of drawings
Fig. 1 is the high-level schematic functional block diagram of embedded integrative vehicle licensing plate distinguishing apparatus
Fig. 2 is the light adjusting circuit scheme drawing of embedded integrative vehicle licensing plate distinguishing apparatus
Fig. 3 is the image taking effect example of embedded integrative vehicle licensing plate distinguishing apparatus
Fig. 4 is the mounting means scheme drawing of embedded integrative vehicle licensing plate distinguishing apparatus
The specific embodiment:
Working process of the present invention is as follows: at first by the analysis to digital image, the exposure of picture pick-up device can be adjusted to the level that helps car plate identification most, and the light filling that in needs, throws light on, thereby guarantee that identifying apparatus can be at the recognition effect under the various light environments.For example, because car plate made by reflex-reflective material, under the night requirements of artificial illumination, the brightness meeting of taking pictures is much higher than car body brightness, and this moment, common camera can be carried out light modulation according to the view picture picture, caused car plate part exposure excessive; The present invention then can be adjusted to exposure suitable level, obtains picture as shown in Figure 3.In addition, what identifying apparatus adopted is high speed exposure mode, can adapt to than the higher speed of a motor vehicle, can be applied to comprise the various occasions of express highway hypervelocity supervision.
The present invention is applied to the operating efficiency that express highway hypervelocity observation system can improve system, reduces law enfrocement official's working strength.Be installed in the number-plate number of the identifying apparatus identification vehicular traffic on the highway section, and together be sent to the charge bayonet socket,, generate the hypervelocity data bank by the number-plate number that management software is put out over-speed vehicles in order with speed information that the equipment of testing the speed records; The identifying apparatus that is installed in the charge bayonet socket identifies each number by the vehicle of this charging aperture, delivers management software; If this car has the hypervelocity behavior on monitored highway section, management software will drive alarm device and to remind the law enfrocement official vehicles peccancy be implemented punishment.
The present invention has very strong comformability to environment, by selecting different imaging lens for use, can be from various angles respectively apart from the identification car plate, with the 25mm camera lens is example, should install according to Fig. 4 method: this identifying apparatus can be installed in a side in track, as far as possible near the track obtaining suitable shooting angle, but should notice that the present invention is difficult for being scratched by vehicle, also should be installed in the overhead height more than 0.5 meter.This identifying apparatus also is furnished with trigger winding, and trigger winding is placed in the track subsurface, and it is 11 meters distance that trigger winding should be about 7-12 rice the best apart from identifying apparatus, can make the visual field of this identifying apparatus can obtain to cover about 3 meters wide scopes like this.
The present invention is owing to adopt the operation hardware platform of dsp chip as recognizer, be that illumination, camera lens, camera and DSP circuit form incorporate version, different with common Vehicle License Plate Recognition System, it does not need computing machine can realize the collection and the identification of license plate image, characteristics such as have recognition performance height, compact conformation, compatible with environment is strong, installation and maintenance are simple.Need not change present existing traffic control system, the present invention can add and apply in all kinds of management systems, thereby makes total system more powerful, manages more effective.
The present invention is a car plate INTELLIGENT IDENTIFICATION system, except that function with number-plate number recognition system, the present invention can also or carry out two kinds of methods of images match to two width of cloth car plate pictures and verify car plate according to the character identification result of car plate, judge that promptly whether the captured vehicle of this identifying apparatus is the vehicle of specifying number plate, or whether the car plate of judging the vehicle that this identifying apparatus is taken is same car plate with the car plate picture of appointment.
Car plate picture matching feature can be used for the stained serious car plate of identification, and whether can't obtain the number-plate number this moment by identification, but can be same car plate by two license plate images of license plate image matching judgment.
This identifying apparatus is an embedded system, with the hardware platform of digital processing chip (DSP) as the algorithm operation, all algorithms are solidificated among the hardware, therefore can realize its function by divorced from computer, make this identifying apparatus have high system stability, and obtain more wide application space.
This identifying apparatus is incorporate system, it is integrated necessary all hardware of number plate recognition system and software, and no longer the equipment that need assist can be finished its function.On hardware, this identifying apparatus is integrated controllable lighting lamp, camera lens, electronic shutter, image-forming module, digital signal processor (DSP), memory device (data and program store), communication module, temperature control module, co-operative control micro controller system etc.; On software, this identifying apparatus is integrated car plate location, characters on license plate cutting, Recognition of License Plate Characters, license plate image coupling scheduling algorithm.Incorporate version makes this equipment reduce environment requirement, can be easy to install, debug.
Technical characterstic of the present invention;
1. adopt the OCR technology, carry out number-plate number identification, and be aided with image matching technology, Stained serious car plate is carried out identification, make this equipment reach very high discrimination power, simultaneously Make total number plate recognition rate of equipment no longer depend critically upon the car plate quality.
2. the identification software recognition speed is 0.5 second, and recognition speed can compare favourably with PC version software.
3. can automatically adjust shutter speed and expose strong according to the effect of car plate in the photographic images Degree, and can automatically open light filling illumination at night, can adapt to early morning, high noon, At dusk, the impact of the various different light environment such as night, evening glow, automobile front lamp.
4. because this equipment is embedded system, its power consumption, volume are very little, and it is right to realize easily The regulation and control of its temperature. Therefore by taking measures, can adapt to very wide temperature range, Has simultaneously the well ability of rainproof, snow, high humidity.
5. can adapt to the very high speed of a motor vehicle.
6. has the independence with respect to application system, only by data communication interface and application Phylogenetic relationship.
7. has very high system reliability, owing to taked anti-deadlock measure and from recovery technology, there is not the deadlock phenomenon in this equipment.
Application of the present invention:
Number-plate number recognition system is one of the most basic composition member of intelligent transportation.Be identified as the basis with this number-plate number, can register automatically, verify, monitor, report to the police vehicle, and then can be applied in multiple occasion, as highway tolling system; Road junction, bayonet socket monitored control system; Sub-district, parking fee collective system, monitored control system; Wagon flow statistics, designating system etc.Main field of application is:
1. expressway tol lcollection, monitoring management
2. sub-district, parking lot management
3. urban road monitor, management violating the regulations
4. car plate login, checking
5. wagon flow statistics, safety management
Claims (3)
1. embedded integrative vehicle licensing plate distinguishing apparatus that is made of picture pick-up device, image capture module, number plate recognition module, interface module, light equipment, control center is characterized in that: the control center that receives energizing signal connects respectively at light equipment, picture pick-up device, image capture module, number plate recognition module, interface module; Picture pick-up device is connected with image capture module and interface module; Image capture module is connected with the number plate recognition module; The number plate recognition module is connected with interface module; Interface module sends the data to user software and system.
2. embedded integrative vehicle licensing plate distinguishing apparatus according to claim 1 is characterized in that: picture pick-up device has CCD imager chip, CCD control chip, divider resistance R1 and R2, analog switch s1 and s2, shooting control to be made of handler and vision signal analog-digital converter; Its connection mode is as follows: connect shooting control micro controller system by digital signal processor (DSP); This handler is by the control end of p1 pin connection switch s1, and the p2 pin connects the control end of switch s2; S1 and s2 are in parallel with divider resistance R1 and R2 respectively; They have a common port to be connected to the sc pin of CCD control chip jointly; The other end is connected respectively to power supply (VCC) and ground (GND); The CCD control chip connects the CCD imager chip, the CCD imager chip produces analog video signal and reaches custom system by interface module, the CCD imager chip connects the vision signal analog-digital converter, and this conv is connected with dsp system digital of digital video data is reached image capture module.
3. embedded integrative vehicle licensing plate distinguishing apparatus according to claim 1, it is characterized in that: after the mainboard dsp system obtains digital image, at first orient the zone of car plate, then to this area image degree of comparing and brightness analysis, when finding that the car plate picture is unfavorable for discerning the number-plate number, then further analyze reason, promptly be since exposure excessively or underexposure, send corresponding light modulation instruction by serial channel to shooting control micro controller system then, pass through the control of s1 and s2 is realized the adjusting of picture pick-up device shutter speed by micro controller system, make in the image that photographs, the car plate part is clear, be easy to identification.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN01139959A CN1420041A (en) | 2001-11-21 | 2001-11-21 | Embedded integrative vehicle licensing plate distinguishing apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN01139959A CN1420041A (en) | 2001-11-21 | 2001-11-21 | Embedded integrative vehicle licensing plate distinguishing apparatus |
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| CN1420041A true CN1420041A (en) | 2003-05-28 |
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| CN01139959A Pending CN1420041A (en) | 2001-11-21 | 2001-11-21 | Embedded integrative vehicle licensing plate distinguishing apparatus |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100357988C (en) * | 2005-03-24 | 2007-12-26 | 上海大学 | Identification method of mobile number plate based on three-channel parallel artificial nerve network |
| CN100396098C (en) * | 2004-12-30 | 2008-06-18 | 汉王科技股份有限公司 | Vehicle video triggered equipment and method based on fast algorithm of locating license plate of vehicle |
| CN100433071C (en) * | 2005-07-11 | 2008-11-12 | 上海高德威智能交通系统有限公司 | System and method for automatically collecting vehicle information |
| CN100449576C (en) * | 2006-08-23 | 2009-01-07 | 王亚盛 | Real-time image monitoring and genuine-fake identification system for vehicle with automatic color regulating and light filling license plate |
| CN101807352A (en) * | 2010-03-12 | 2010-08-18 | 北京工业大学 | Method for detecting parking stalls on basis of fuzzy pattern recognition |
| CN103486654A (en) * | 2013-10-10 | 2014-01-01 | 张久明 | Energy saving control method and energy saving control system for heat exchange station |
| CN103646550A (en) * | 2013-12-30 | 2014-03-19 | 中国科学院自动化研究所 | Intelligent vehicle license plate recognition system |
| CN104376316A (en) * | 2014-12-08 | 2015-02-25 | 北京市新技术应用研究所 | License plate image acquisition method and device |
| CN106358333A (en) * | 2016-08-19 | 2017-01-25 | 深圳亿维锐创科技股份有限公司 | A Supplementary Lighting System for Intelligent Control License Plate Recognition Camera |
| CN109214222A (en) * | 2018-08-31 | 2019-01-15 | 四川和鼎昇泰信息技术有限公司 | Based on Embedded 32 cigarette laser code identifying systems and its recognition methods |
-
2001
- 2001-11-21 CN CN01139959A patent/CN1420041A/en active Pending
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100396098C (en) * | 2004-12-30 | 2008-06-18 | 汉王科技股份有限公司 | Vehicle video triggered equipment and method based on fast algorithm of locating license plate of vehicle |
| CN100357988C (en) * | 2005-03-24 | 2007-12-26 | 上海大学 | Identification method of mobile number plate based on three-channel parallel artificial nerve network |
| CN100433071C (en) * | 2005-07-11 | 2008-11-12 | 上海高德威智能交通系统有限公司 | System and method for automatically collecting vehicle information |
| CN100449576C (en) * | 2006-08-23 | 2009-01-07 | 王亚盛 | Real-time image monitoring and genuine-fake identification system for vehicle with automatic color regulating and light filling license plate |
| CN101807352A (en) * | 2010-03-12 | 2010-08-18 | 北京工业大学 | Method for detecting parking stalls on basis of fuzzy pattern recognition |
| CN101807352B (en) * | 2010-03-12 | 2012-12-05 | 北京工业大学 | Method for detecting parking stalls on basis of fuzzy pattern recognition |
| CN103486654A (en) * | 2013-10-10 | 2014-01-01 | 张久明 | Energy saving control method and energy saving control system for heat exchange station |
| CN103646550A (en) * | 2013-12-30 | 2014-03-19 | 中国科学院自动化研究所 | Intelligent vehicle license plate recognition system |
| CN104376316A (en) * | 2014-12-08 | 2015-02-25 | 北京市新技术应用研究所 | License plate image acquisition method and device |
| CN104376316B (en) * | 2014-12-08 | 2019-01-04 | 北京市新技术应用研究所 | License plate image acquisition method and device |
| CN106358333A (en) * | 2016-08-19 | 2017-01-25 | 深圳亿维锐创科技股份有限公司 | A Supplementary Lighting System for Intelligent Control License Plate Recognition Camera |
| CN109214222A (en) * | 2018-08-31 | 2019-01-15 | 四川和鼎昇泰信息技术有限公司 | Based on Embedded 32 cigarette laser code identifying systems and its recognition methods |
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