CN105931468A - Method for automatically regulating and controlling external fill light for license plate identification - Google Patents
Method for automatically regulating and controlling external fill light for license plate identification Download PDFInfo
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- CN105931468A CN105931468A CN201610522446.XA CN201610522446A CN105931468A CN 105931468 A CN105931468 A CN 105931468A CN 201610522446 A CN201610522446 A CN 201610522446A CN 105931468 A CN105931468 A CN 105931468A
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- 230000001105 regulatory effect Effects 0.000 title claims abstract description 15
- 230000001276 controlling effect Effects 0.000 title abstract description 3
- 238000005286 illumination Methods 0.000 claims abstract description 51
- 238000002347 injection Methods 0.000 claims description 16
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- 230000001678 irradiating effect Effects 0.000 abstract 1
- 239000013589 supplement Substances 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 5
- 239000000243 solution Substances 0.000 description 3
- 230000003068 static effect Effects 0.000 description 3
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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
Abstract
The invention discloses a method for automatically regulating and controlling an external fill light for license plate identification. The method includes the steps of obtaining the illumination intensity of a license plate identification area and the vehicle height before a vehicle entering into the license plate identification area, adjusting the angle of the fill light based on the formula Y=60X-60 according to the obtained vehicle height, with the Y being the included angle between the irradiating light of the fill light and the horizontal plane and X being the vehicle height, and adjusting the actual power of the fill light according to the obtained illumination intensity. The higher the obtained illumination intensity, the lower the actual power of the fill light, and the lower the obtained illumination intensity, the higher the actual power of the fill light. The method solves the problem that the illumination angle and illumination intensity of the fill light in the prior art remain unchanged, and light supplement for vehicles various in height can not be accurately done. The illumination angle and illumination intensity of a fill light can be adjusted according to actual situations.
Description
Technical field
The present invention relates to Car license recognition field, concretely relate to the method for automatically regulating of the external light compensating lamp of a kind of Car license recognition.
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 the method for automatically regulating of the external light compensating lamp of a kind of Car license recognition, 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 adjust the purpose of light compensating lamp lighting angle and intensity according to practical situation.
The present invention is achieved through the following technical solutions:
The method for automatically regulating of the external light compensating lamp of a kind of Car license recognition, comprises the following steps:
A, enter at vehicle and obtain the intensity of illumination in Car license recognition region, the height of vehicle before Car license recognition region；
B, according to acquired height of car, adjust light compensating lamp angle: Y=60X-60 by following formula；Wherein, Y is the angle of light compensating lamp injection light and horizontal plane, and X is height of car；
C, according to acquired intensity of illumination, adjust the actual power of light compensating lamp, acquired intensity of illumination is the highest, and the actual power of light compensating lamp is the least；Acquired intensity of illumination is the lowest, and the actual power of light compensating lamp is the biggest.
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 the method for automatically regulating of the external light compensating lamp of a kind of Car license recognition.First the intensity of illumination in Car license recognition region, the height of vehicle are i.e. obtained before vehicle enters Car license recognition region by this method, afterwards according to height adjustment light compensating lamp and the angle of horizontal plane of vehicle, light compensating lamp injection light is made to meet Y=60X-60 with the angle of horizontal plane, wherein, Y is the angle number of degrees of light compensating lamp injection light and horizontal plane, X is height of car, and unit takes standard unit: rice.Existing height of car is all higher than 1 meter, and therefore in above formula, Y is consistently greater than 0, i.e. light compensating lamp injection light is consistently greater than 0 degree with the angle number of degrees of horizontal plane.From above formula, light compensating lamp penetrates light and the angle of horizontal plane and height of car linearly positive change, owing to height of car is the highest, car plate hanging position is the highest, therefore can be obtained by above-mentioned formula: height of car is the highest, light compensating lamp injection light is the biggest with the angle of horizontal plane, i.e. light compensating lamp injection light is the highest, therefore, it is possible to make for the highest vehicle, light filling position is the most top；Otherwise, height of car is the lowest, and light filling position the most on the lower, thus meets the vehicle to various height and carries out light filling accurately, it is to avoid light compensating lamp light maintains static the problem being difficult to meet various vehicle.Meanwhile, according to the intensity of illumination in acquired Car license recognition region, the actual power of light compensating lamp is adjusted: acquired intensity of illumination is the highest, and the actual power of light compensating lamp is the least, and the light that light compensating lamp sends is the strongest；Otherwise acquired intensity of illumination is the lowest, the actual power of light compensating lamp is the biggest, and the light that light compensating lamp is sent is the most weak.So that the light intensity in Car license recognition region is in suitable brightness 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 cross the unclear situation of license plate image of dark acquisition, thus realize adjusting flexibly light compensating lamp intensity of illumination, it is ensured that Car license recognition accurate.
Further, described step b and step c are carried out simultaneously.It is i.e. the adjustment to light compensating lamp light intensity and the adjustment of light compensating lamp angle is carried out simultaneously, thus reduces movement time, it is ensured that vehicle brightness when entering Car license recognition region and carrying out Car license recognition is adjusted in place the most with angle.
Further, in described step c, the actual power of light compensating lamp with the relation of acquired intensity of illumination is:
When N is less than 500, M=0.2N+100；
When N is more than or equal to 500, M=0；
Wherein, M is the actual power of light compensating lamp, and N is acquired intensity of illumination.
In above formula, intensity of illumination unit is standard unit lux, the luminosity of 500 luxs disclosure satisfy that the brightness requirement of Image Acquisition in Vehicle License Plate Recognition System, therefore, when the intensity of illumination in Car license recognition region is more than or equal to 500 lux, the actual power of light compensating lamp is 0, i.e. light compensating lamp does not works.When the intensity of illumination in Car license recognition region is less than 500 lux, from above formula, the actual power of light compensating lamp and intensity of illumination linearly negative correlation, i.e. along with the continuous reduction of intensity of illumination, the actual power of light compensating lamp linearly increases, the brightness sent also is gradually increased, and is guaranteed being adjusted of power linear rule of light compensating lamp by above-mentioned formula, it is to avoid the wireless increase of actual power of light compensating lamp burns out bulb.
The present invention compared with prior art, has such advantages as and beneficial effect:
1, the method for automatically regulating of the external light compensating lamp of a kind of Car license recognition of the present invention, before vehicle enters Car license recognition region, the height of vehicle is obtained, afterwards according to height adjustment light compensating lamp and the angle of horizontal plane of vehicle, light compensating lamp injection light is made to meet Y=60X-60 with the angle of horizontal plane, height of car is the highest, and light compensating lamp injection light is the biggest with the angle of horizontal plane, i.e. light compensating lamp injection light is the highest, therefore, it is possible to make for the highest vehicle, light filling position is the most top；Otherwise, height of car is the lowest, and light filling position the most on the lower, thus meets the vehicle to various height and carries out light filling accurately, it is to avoid light compensating lamp light maintains static the problem being difficult to meet various vehicle；
2, the method for automatically regulating of the external light compensating lamp of a kind of Car license recognition of the present invention, before vehicle enters Car license recognition region, the intensity of illumination in Car license recognition region is obtained, further according to acquired intensity of illumination, adjust the actual power of light compensating lamp, acquired intensity of illumination is the highest, and the actual power of light compensating lamp is the least；Otherwise acquired intensity of illumination is the lowest, the actual power of light compensating lamp is the biggest, so that the light intensity in Car license recognition region is in suitable brightness 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 cross the unclear situation of license plate image of dark acquisition, thus realize adjusting flexibly light compensating lamp intensity of illumination, it is ensured that Car license recognition accurate.
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 schematic flow sheet of one specific embodiment of the present invention.
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:
The method for automatically regulating of the external light compensating lamp of a kind of Car license recognition as shown in Figure 1, comprises the following steps:
A, enter at vehicle and obtain the intensity of illumination in Car license recognition region, the height of vehicle before Car license recognition region；B, according to acquired height of car, adjust light compensating lamp angle: Y=60X-60 by following formula；Wherein, Y is the angle of light compensating lamp injection light and horizontal plane, and X is height of car；C, according to acquired intensity of illumination, adjust the actual power of light compensating lamp, acquired intensity of illumination is the highest, and the actual power of light compensating lamp is the least；Acquired intensity of illumination is the lowest, and the actual power of light compensating lamp is the biggest.Wherein, described step b and step c are carried out simultaneously.In described step c, the actual power of light compensating lamp with the relation of acquired intensity of illumination is:
When N is less than 500, M=0.2N+100；
When N is more than or equal to 500, M=0；
Wherein, M is the actual power of light compensating lamp, and N is acquired intensity of illumination.
First the intensity of illumination in Car license recognition region, the height of vehicle are i.e. obtained before vehicle enters Car license recognition region by this method, afterwards according to height adjustment light compensating lamp and the angle of horizontal plane of vehicle, light compensating lamp injection light is made to meet Y=60X-60 with the angle of horizontal plane.From above formula, light compensating lamp penetrates light and the angle of horizontal plane and height of car linearly positive change, owing to height of car is the highest, car plate hanging position is the highest, therefore can be obtained by above-mentioned formula: height of car is the highest, light compensating lamp injection light is the biggest with the angle of horizontal plane, i.e. light compensating lamp injection light is the highest, therefore, it is possible to make for the highest vehicle, light filling position is the most top；Otherwise, height of car is the lowest, and light filling position the most on the lower, thus meets the vehicle to various height and carries out light filling accurately, it is to avoid light compensating lamp light maintains static the problem being difficult to meet various vehicle.Meanwhile, according to the intensity of illumination in acquired Car license recognition region, the actual power of light compensating lamp is adjusted: acquired intensity of illumination is the highest, and the actual power of light compensating lamp is the least, and the light that light compensating lamp sends is the strongest；Otherwise acquired intensity of illumination is the lowest, the actual power of light compensating lamp is the biggest, and the light that light compensating lamp is sent is the most weak.So that the light intensity in Car license recognition region is in suitable brightness 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 cross the unclear situation of license plate image of dark acquisition, thus realize adjusting flexibly light compensating lamp intensity of illumination, it is ensured that Car license recognition accurate.
Embodiment 2:
A kind of method for automatically regulating of the external light compensating lamp of Car license recognition, on the basis of embodiment 1, the car of highly 1.6m will pass through Car license recognition region, the intensity of illumination obtained in Car license recognition region now by illuminance sensor is 300 luxs, the angle then adjusting light compensating lamp injection light and horizontal plane is 36 degree, the actual power simultaneously adjusting light compensating lamp is 40 watts, when can quickly ensure this vehicle by Car license recognition region, the light angle of light compensating lamp and brightness are in optimum position
Embodiment 3:
A kind of method for automatically regulating of the external light compensating lamp of Car license recognition, on the basis of embodiment 1, it is highly that the medium-sized minibus of 2m will pass through Car license recognition region, the intensity of illumination obtained in Car license recognition region now by illuminance sensor is 550 luxs, then adjusting light compensating lamp actual power is 0, i.e. closes light compensating lamp.Now the angle of light compensating lamp injection light and horizontal plane is because of 60 degree, but due to light compensating lamp is in closedown situation, therefore whether is adjusted the most not affecting the concrete utilization of the present invention for its angle.
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 (3)
1. the method for automatically regulating of the external light compensating lamp of Car license recognition, it is characterised in that comprise the following steps:
A, enter at vehicle and obtain the intensity of illumination in Car license recognition region, the height of vehicle before Car license recognition region；
B, according to acquired height of car, adjust light compensating lamp angle: Y=60X-60 by following formula；Wherein, Y is the angle of light compensating lamp injection light and horizontal plane, and X is height of car；
C, according to acquired intensity of illumination, adjust the actual power of light compensating lamp, acquired intensity of illumination is the highest, and the actual power of light compensating lamp is the least；Acquired intensity of illumination is the lowest, and the actual power of light compensating lamp is the biggest.
The method for automatically regulating of the external light compensating lamp of a kind of Car license recognition the most according to claim 1, it is characterised in that: described step b and step c are carried out simultaneously.
The method for automatically regulating of the external light compensating lamp of a kind of Car license recognition the most according to claim 1 and 2, it is characterised in that: in described step c, the actual power of light compensating lamp with the relation of acquired intensity of illumination is:
When N is less than 500, M=0.2N+100；
When N is more than or equal to 500, M=0；
Wherein, M is the actual power of light compensating lamp, and N is acquired intensity of illumination.
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| 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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| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
| CN114257751A (en) * | 2021-12-17 | 2022-03-29 | 航天信息股份有限公司 | Follow-up 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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