CN105931469A - External fill light structure for license plate recognition system - Google Patents
External fill light structure for license plate recognition system Download PDFInfo
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- CN105931469A CN105931469A CN201610522449.3A CN201610522449A CN105931469A CN 105931469 A CN105931469 A CN 105931469A CN 201610522449 A CN201610522449 A CN 201610522449A CN 105931469 A CN105931469 A CN 105931469A
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- compensating lamp
- light compensating
- light
- license plate
- fill light
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- 238000005286 illumination Methods 0.000 abstract description 12
- 238000005516 engineering process Methods 0.000 description 5
- 230000011514 reflex Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
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- 230000006872 improvement Effects 0.000 description 1
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- 238000003909 pattern recognition Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Classifications
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- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/01—Detecting movement of traffic to be counted or controlled
- G08G1/017—Detecting movement of traffic to be counted or controlled identifying vehicles
- G08G1/0175—Detecting movement of traffic to be counted or controlled identifying vehicles by photographing vehicles, e.g. when violating traffic rules
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Abstract
The invention discloses an external fill light structure for a license plate recognition system. The external fill light structure comprises a fill light arranged under an image acquisition device and fixed on the driving end of a stepping motor, a door frame, which is arranged in front of the image acquisition device and of which the top is provided with a vertically downward range finding sensor, and a luminous intensity sensor which is arranged on the side of the door frame toward the direction of the fill light. The external fill light structure further comprises a controller. The signal receiving end of the controller is respectively and electrically connected with a range finding sensor and the luminous intensity sensor, and the signal output end of the controller is respectively and electrically connected with the stepping motor and the fill light. The external fill light structure solves the problems that the illumination light angle and the light intensity of a fill light are fixed in the prior art, and that light fill for vehicles of various heights can not be done accurately. The purpose of automatically adjusting the light illumination angle and intensity of a fill light is achieved.
Description
Technical field
The present invention relates to Car license recognition field, concretely relate to a kind of external light compensating lamp structure for Vehicle License Plate Recognition System.
Background technology
License plate recognition technology is a kind of application in License Plate Identification of the Video Image identification technology.Car license recognition is one of important component part in modern intelligent transportation system, applies quite varied.It is based on the technology such as Digital Image Processing, pattern recognition, computer vision, and vehicle image or video sequence to shot by camera are analyzed, and obtain each the unique number-plate number of automobile, thus complete identification process.Can realize parking lot fee collection management by some subsequent treatment means, traffic flow Con trolling index is measured, vehicle location, automobile burglar, the supervision of high way super speed automatization, electronic eye used for catching red light runner, toll station etc. function.For safeguarding traffic safety and urban public security, prevent traffic jam, it is achieved traffic automation management has the meaning of reality.License plate recognition technology is the Main Means identifying testing vehicle register in parking lot management.For parking lot such as underground, parking garage etc. that light is the best, in order to obtain more preferable image quality and improve discrimination, need external light compensating lamp is installed.But, different automobile types has different height, and its car plate suspension height is the most variant, but existing external light compensating lamp lighting angle all immobilizes with intensity of illumination, it is difficult to accurately the vehicle of various height is carried out light filling.
Summary of the invention
The present invention proposes a kind of external light compensating lamp structure for Vehicle License Plate Recognition System, all immobilize with intensity of illumination with light compensating lamp lighting angle in solution prior art, the problem being difficult to accurately the vehicle of various height be carried out light filling, it is achieved automatically adjust the purpose of light compensating lamp lighting angle and intensity.
The present invention is achieved through the following technical solutions:
A kind of external light compensating lamp structure for Vehicle License Plate Recognition System, including the light compensating lamp being arranged on below image acquisition equipment, described light compensating lamp is fixed on the drive end of motor, also include the doorframe being arranged on image acquisition equipment front, described doorframe inside top is provided with distance measuring sensor straight down, and described doorframe is provided with illuminance sensor towards the side in direction, light compensating lamp place；Also including that controller, the signal receiving end of described controller electrically connect with distance measuring sensor, illuminance sensor respectively, the signal output part of described controller electrically connects with motor, light compensating lamp respectively.
For the vehicle of different automobile types in prior art, its car plate suspension height has difference, but existing external light compensating lamp lighting angle all immobilizes with intensity of illumination, being difficult to vehicle to various height accurately and carry out the problem of light filling, the present invention proposes a kind of external light compensating lamp structure for Vehicle License Plate Recognition System.Described light compensating lamp is arranged on below the image acquisition equipment in existing Vehicle License Plate Recognition System, described image acquisition equipment is i.e. for arresting the device of license plate image information, such as the equipment such as photographic head, digital camera, described light compensating lamp is fixed on the drive end of motor, i.e. it is as the rotation of step motor drive end, light compensating lamp rotates therewith, and therefore its lighting angle is adjusted change the most therewith.Also include the doorframe being arranged on image acquisition equipment front, doorframe is crossed on road, vehicle passes through in doorframe, the distance measuring sensor straight down arranged by doorframe inside top, the height of car passed through is measured, distance measuring sensor measures doorframe top to the distance of roof, transmit a signal to described controller, controller doorframe height deducts this distance, obtain height of car, motor can be controlled according to height of car to rotate, thus drive light compensating lamp to rotate, the lighting angle making light compensating lamp adjusts in real time to the position towards vehicle license plate, i.e. height of car is the highest, light compensating lamp light beam is the biggest with the angle on ground；Height of car is the lowest, and light compensating lamp light beam is the least with the angle on ground.In addition, described doorframe is provided with illuminance sensor towards the side in direction, light compensating lamp place, for monitoring light intensity, and this light intensity signal is transmitted to controller, controller is further according to the intensity of illumination of light intensity regulation and control light compensating lamp, i.e. light intensity signal is the most weak, the biggest by the electric current of light compensating lamp, and the illumination luminosity of light compensating lamp is the strongest；Light intensity signal is the strongest, the least by the electric current of light compensating lamp, the illumination luminosity of light compensating lamp is the least, with this, light intensity at doorframe is in dynamic balance all the time, avoid light the brightest, the reflective too strong license plate image causing obtaining of car plate is over-exposed, it also avoid light and crosses the unclear situation of license plate image of dark acquisition.
Further, the difference in height between described light compensating lamp and image acquisition equipment is more than 30cm.Both mounting distances are the nearest, the light of light compensating lamp can be caused directly to be reflexed to camera lens by the reflecting coating on car plate surface, cause car plate overexposure in video image, it appears turn white, affect final recognition result.Therefore difference in height between light compensating lamp and image acquisition equipment is set more than 30cm, it is able to ensure that both air line distance is more than 30cm, guarantee that the lighting angle of light compensating lamp and the camera lens of image acquisition equipment have enough angle difference, it is to avoid the light of light compensating lamp directly reflexes in camera lens.
Further, described light compensating lamp is white LED lamp.White LED lamp can send the white light of access expansion light, it is to avoid the normal work of image acquisition equipment is brought interference by other color light, it is ensured that car plate is accurately identified by it.
Further, described LED classification of waterproof IP65.IP grade Shi Shi International Electrotechnical Commission is used for assert the code name of degree of protection, and IP grade is made up of two numerals, and first digit represents dust-proof；Second digit represents waterproof, and numeral its degree of protection of the biggest expression is the best.According to GB4208-2008, IP65 classification of waterproof, there is excellent outdoor water-proof ability, can have good insulating effect for rainwater etc., it is to avoid LED is by rainwater interference effect.
The present invention compared with prior art, has such advantages as and beneficial effect:
1, a kind of external light compensating lamp structure for Vehicle License Plate Recognition System of the present invention, light compensating lamp is fixed on the drive end of motor, in image acquisition equipment front, doorframe is set, vehicle passes through in doorframe, the distance measuring sensor straight down arranged by doorframe inside top, the height of car passed through is measured, transmit a signal to controller and be calculated height of car, motor can be controlled according to height of car to rotate, thus drive light compensating lamp to rotate, make the lighting angle of light compensating lamp adjust in real time to the position towards vehicle license plate；
2, a kind of external light compensating lamp structure for Vehicle License Plate Recognition System of the present invention, at doorframe, the side in direction, light compensating lamp place is provided with illuminance sensor, for this light intensity signal is transmitted to controller, controller is according to the intensity of illumination of light intensity regulation and control light compensating lamp, light intensity at doorframe is in dynamic balance all the time, avoid light the brightest, the reflective too strong license plate image causing obtaining of car plate is over-exposed, it also avoid light and crosses the unclear situation of license plate image of dark acquisition；
3, a kind of external light compensating lamp structure for Vehicle License Plate Recognition System of the present invention, the difference in height between light compensating lamp and image acquisition equipment is more than 30cm.So that it is guaranteed that both air line distance is more than 30cm, it is ensured that the lighting angle of light compensating lamp and the camera lens of image acquisition equipment have enough angle difference, it is to avoid the light of light compensating lamp directly reflexes to cause in camera lens image overexposure, the situation affecting recognition result occurs.
Accompanying drawing explanation
Accompanying drawing described herein is used for providing being further appreciated by the embodiment of the present invention, constitutes the part of the application, is not intended that the restriction to the embodiment of the present invention.In the accompanying drawings:
Fig. 1 is the structural representation of one specific embodiment of the present invention；
Fig. 2 is the front view of doorframe of the present invention.
Wherein: 1-image acquisition equipment, 2-light compensating lamp, 3-motor, 31-drive end, 4-doorframe, 5-distance measuring sensor, 6-illuminance sensor, 7-controller.
Detailed description of the invention
For making the object, technical solutions and advantages of the present invention clearer, below in conjunction with embodiment and accompanying drawing, the present invention is described in further detail, and the exemplary embodiment of the present invention and explanation thereof are only used for explaining the present invention, not as a limitation of the invention.
Embodiment 1:
A kind of external light compensating lamp structure for Vehicle License Plate Recognition System as shown in Figures 1 and 2, including the light compensating lamp 2 being arranged on below image acquisition equipment 1, described light compensating lamp 2 is fixed on the drive end 31 of motor 3, also include the doorframe 4 being arranged on image acquisition equipment 1 front, described doorframe 4 inside top is provided with distance measuring sensor 5 straight down, and described doorframe 4 is provided with illuminance sensor 6 towards the side in direction, light compensating lamp 2 place；Also including that controller 7, the signal receiving end of described controller 7 electrically connect with distance measuring sensor 5, illuminance sensor 6 respectively, the signal output part of described controller 7 electrically connects with motor 3, light compensating lamp 2 respectively；Difference in height between described light compensating lamp 2 and image acquisition equipment 1 is more than 30cm；Described light compensating lamp 2 is the white LED lamp of classification of waterproof IP65.
In the present invention, below the image acquisition equipment 1 that described light compensating lamp 2 is arranged in existing Vehicle License Plate Recognition System, described image acquisition equipment 1 is i.e. for arresting the device of license plate image information, such as the equipment such as photographic head, digital camera, described light compensating lamp 2 is fixed on the drive end 31 of motor 3, i.e. being as the rotation of motor 3 drive end 31, light compensating lamp 2 rotates therewith, and therefore its lighting angle is adjusted change the most therewith.Also include the doorframe 4 being arranged on image acquisition equipment 1 front, doorframe 4 is crossed on road, vehicle passes through in doorframe 4, the distance measuring sensor 5 straight down arranged by doorframe 4 inside top, the height of car passed through is measured, distance measuring sensor 5 measures doorframe 4 top to the distance of roof, transmit a signal to described controller 7, controller 7 doorframe 4 highly deducts this distance, obtain height of car, motor 3 can be controlled according to height of car to rotate, thus drive light compensating lamp 2 to rotate, the lighting angle making light compensating lamp 2 adjusts in real time to the position towards vehicle license plate, i.e. height of car is the highest, light compensating lamp 2 light beam is the biggest with the angle on ground；Height of car is the lowest, and light compensating lamp 2 light beam is the least with the angle on ground.In addition, described doorframe 4 is provided with illuminance sensor 6 towards the side in direction, light compensating lamp 2 place, for monitoring light intensity, and this light intensity signal is transmitted to controller 7, controller 7 is further according to the intensity of illumination of light intensity regulation and control light compensating lamp 2, i.e. light intensity signal is the most weak, and the electric current by light compensating lamp 2 is the biggest, and the illumination luminosity of light compensating lamp 2 is the strongest；Light intensity signal is the strongest, electric current by light compensating lamp 2 is the least, the illumination luminosity of light compensating lamp 2 is the least, with this, light intensity at doorframe 4 is in dynamic balance all the time, avoid light the brightest, the reflective too strong license plate image causing obtaining of car plate is over-exposed, it also avoid light and crosses the unclear situation of license plate image of dark acquisition.Difference in height between light compensating lamp 2 and image acquisition equipment 1 is set more than 30cm, it is able to ensure that both air line distance is more than 30cm, guarantee that the lighting angle of light compensating lamp 2 and the camera lens of image acquisition equipment 1 have enough angle difference, it is to avoid the light of light compensating lamp 2 directly reflexes in camera lens.
Above-described detailed description of the invention; the purpose of the present invention, technical scheme and beneficial effect are further described; it is it should be understood that; the foregoing is only the detailed description of the invention of the present invention; the protection domain being not intended to limit the present invention; all within the spirit and principles in the present invention, any modification, equivalent substitution and improvement etc. done, should be included within the scope of the present invention.
Claims (4)
1. the external light compensating lamp structure for Vehicle License Plate Recognition System, including the light compensating lamp (2) being arranged on image acquisition equipment (1) lower section, it is characterized in that: described light compensating lamp (2) is fixed on the drive end (31) of motor (3), also include the doorframe (4) being arranged on image acquisition equipment (1) front, described doorframe (4) inside top is provided with distance measuring sensor (5) straight down, and described doorframe (4) is provided with illuminance sensor (6) towards the side in light compensating lamp (2) direction, place；Also including controller (7), the signal receiving end of described controller (7) electrically connects with distance measuring sensor (5), illuminance sensor (6) respectively, and the signal output part of described controller (7) electrically connects with motor (3), light compensating lamp (2) respectively.
A kind of external light compensating lamp structure for Vehicle License Plate Recognition System the most according to claim 1, it is characterised in that: the difference in height between described light compensating lamp (2) and image acquisition equipment (1) is more than 30cm.
A kind of external light compensating lamp structure for Vehicle License Plate Recognition System the most according to claim 1 and 2, it is characterised in that: described light compensating lamp (2) is white LED lamp.
A kind of external light compensating lamp structure for Vehicle License Plate Recognition System the most according to claim 3, it is characterised in that: described LED classification of waterproof IP65.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610522449.3A CN105931469B (en) | 2016-07-06 | 2016-07-06 | A kind of external light filling modulated structure for Vehicle License Plate Recognition System |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610522449.3A CN105931469B (en) | 2016-07-06 | 2016-07-06 | A kind of external light filling modulated structure for Vehicle License Plate Recognition System |
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| CN105931469B CN105931469B (en) | 2019-08-27 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107578628A (en) * | 2017-10-26 | 2018-01-12 | 成都极点芯联科技有限公司 | It is easy to identify the automatic traffic system control method of vehicle |
| CN109766862A (en) * | 2019-01-21 | 2019-05-17 | 安阳工学院 | A kind of dynamic licence plate recognition method based on distance and environment |
| CN110113543A (en) * | 2019-04-25 | 2019-08-09 | 深圳天地宽视信息科技有限公司 | The data processing method and device of the setting of light filling lamp group are carried out by ray tracing |
| CN113538928A (en) * | 2021-07-09 | 2021-10-22 | 浙江浩腾电子科技股份有限公司 | Adjustable light traffic technology monitoring imaging light supplementing device based on laser ranging |
| CN114049776A (en) * | 2021-12-15 | 2022-02-15 | 航天信息股份有限公司 | Vehicle license plate snapshot light filling system |
| CN114584719A (en) * | 2022-03-07 | 2022-06-03 | 深圳市上品国际智能照明科技有限公司 | LED infrared light supplementing device for vehicle identification in traffic highway section |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107578628A (en) * | 2017-10-26 | 2018-01-12 | 成都极点芯联科技有限公司 | It is easy to identify the automatic traffic system control method of vehicle |
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| CN109766862A (en) * | 2019-01-21 | 2019-05-17 | 安阳工学院 | A kind of dynamic licence plate recognition method based on distance and environment |
| CN110113543A (en) * | 2019-04-25 | 2019-08-09 | 深圳天地宽视信息科技有限公司 | The data processing method and device of the setting of light filling lamp group are carried out by ray tracing |
| CN113538928A (en) * | 2021-07-09 | 2021-10-22 | 浙江浩腾电子科技股份有限公司 | Adjustable light traffic technology monitoring imaging light supplementing device based on laser ranging |
| CN114049776A (en) * | 2021-12-15 | 2022-02-15 | 航天信息股份有限公司 | Vehicle license plate snapshot light filling system |
| CN114584719A (en) * | 2022-03-07 | 2022-06-03 | 深圳市上品国际智能照明科技有限公司 | LED infrared light supplementing device for vehicle identification in traffic highway section |
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| CN105931469B (en) | 2019-08-27 |
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