CN107702898A - A kind of car headlamp detection method and device - Google Patents
A kind of car headlamp detection method and device Download PDFInfo
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- CN107702898A CN107702898A CN201710909649.9A CN201710909649A CN107702898A CN 107702898 A CN107702898 A CN 107702898A CN 201710909649 A CN201710909649 A CN 201710909649A CN 107702898 A CN107702898 A CN 107702898A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
- G01M11/02—Testing optical properties
- G01M11/06—Testing the alignment of vehicle headlight devices
- G01M11/064—Testing the alignment of vehicle headlight devices by using camera or other imaging system for the light analysis
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
- G01M11/02—Testing optical properties
- G01M11/06—Testing the alignment of vehicle headlight devices
- G01M11/064—Testing the alignment of vehicle headlight devices by using camera or other imaging system for the light analysis
- G01M11/065—Testing the alignment of vehicle headlight devices by using camera or other imaging system for the light analysis details about the image analysis
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Abstract
The invention belongs to detection technique field.Described car headlamp detection method comprises the steps of：First, the light source of tested vehicle right and left headlamp is gathered：With a number code-phase machine side to being detected automobile, while gather the light source of tested vehicle right and left headlamp；2nd, the projected spot of tested vehicle right and left headlamp is gathered：With another digital camera back to tested automobile, while gather the hot spot of tested vehicle right and left headlamp projection on the projection screen；3rd, Digital Image Processing：The data for being gathered step (1), (two) by communication cable are sent into computer, and complete the detection to car headlamp by supporting Digital Image Processing algorithm.The present invention is entirely different with prior art, and when being detected, without making any movement and headlamp being aligned, detection process is automatically performed, reliable, low cost, without manually being measured.High measurement accuracy and low measurement error are ensure that from measuring method.
Description
Technical field
The present invention relates to a kind of detection method and device for car headlamp, belong to detection technique field.
Background technology
Chinese patent application CN201610017752.8 discloses a kind of automatic intelligent automatic tester for vehicle headlamp, the hair
Bright one-level photosensory assembly can carry out Primary Location to the region of the light intensity maximum of car headlamp, and two level photosensory assembly can be right
The maximum region of light intensity is accurately positioned, so as to allow the maximum area of the light-intensity test element energy face light intensity of detector body
Domain, to obtain accurate light intensity data.Pass through the linkage of transmission component so that detector body can be positioned intelligently, and be positioned
Speed is very fast；The position induction device that the invention is provided with can perceive whether automobile is in correct test position, it is ensured that inspection
The data surveyed detected by instrument body are effective.Simultaneously as the setting of power supply module and power storage module so that the transmission of the invention
Component can not be fettered by power line, and operation is safer.
Chinese patent application CN03258947.6 discloses a kind of detector, and basic training is automatically positioned using existing detector
Can, using time battery pack from motion tracking long-distance light light beam, detector is aligned tested car light, the screen in light detection case
When screen board is placed in forward and backward two measurement position by plate drive mechanism, camera absorbs two frames of the light beams on screen board and thrown
Shadow image, two field pictures are sent into computer through image pick-up card, through computer identifying processing, find out the characteristic point in two images
The locus of (turning point of light shape center or dipped beam "cut-off"line), according to 2 points of principles for determining a straight line, before measuring
Illuminator light beam irradiates azimuth.
Chinese patent application CN201620028138.7 discloses a kind of automatic intelligent automatic tester for vehicle headlamp, its
One-level photosensory assembly can carry out Primary Location to the region of the light intensity maximum of car headlamp, and two level photosensory assembly can be to light intensity
Maximum region is accurately positioned, so as to allow the maximum region of the light-intensity test element energy face light intensity of detector body, with
Obtain accurate light intensity data.Pass through the linkage of transmission component so that detector body can be positioned intelligently, and locating speed is non-
Normal is fast；The position induction device that the utility model is provided with can perceive whether automobile is in correct test position, it is ensured that detection
Data detected by instrument body are effective.Simultaneously as the setting of power supply module and power storage module so that the biography of the utility model
Dynamic component can not be fettered by power line, and operation is safer.The utility model is used for the detection of car headlamp parameter.
Chinese patent application CN201620028136.8 discloses the automatic automatic tester for vehicle headlamp for catching focus, including
The detector body of the light receiver chamber of opening forward, the detector body is interior to be provided with light-intensity test element, the light intensity inspection
The upside of element, downside, left side, right side are surveyed at least provided with a light-sensitive element.By driving detector body up and down
It is mobile, trend, numerical value, the light-sensitive element of contrast upside and the photosensitive member of downside of light intensity change are sensed according to light-sensitive element
The data of the light-sensitive element of the data of part, the light-sensitive element in contrast left side and right side, the focus position of car headlamp can be calculated
Put, so as to realize the automatic focus for catching car headlamp, by the position adjustment of detector body, allow light-intensity test element pair
The most bright position of prospective vehicle headlamp, and the setting of light-sensitive element can carry out assisted calibration.Before the utility model is used for automobile
Illuminator detector.
Above-mentioned several patent applications are existing most common automobile headlight detecting devices.Described device is all present such as
Lower shortcoming：1) will by horizontal and vertical directions moving detector (abbreviation lamp box) come be respectively aligned to a left side for tested vehicle,
Right two headlamps；2) due to lamp box to be moved, used including height sensor, two direct current generators (motor) and
Corresponding control circuit, mechanism so that whole detection means is complicated, control is complicated, cost is high；3) and due to lamp box with it is tested before
Illuminator distance only has or less than 1 meter (national measurement standard is 10 meters), and the error in measuring method thus brought is big, and measurement is accurate
Exactness is difficult to ensure that.
Although CN201610017752.8 has made a little to improve to car headlamp detection method traditional at present, it is adopted more
With one group of photosensory assembly, although be advantageous to the alignment of spot center, but still the problem of exist above；Due to having used one more
Group photosensory assembly so that measurement apparatus is increasingly complex, and more complicated device reliability is also lower, and cost also can be higher.
CN03258947.6 be to aforementioned patent applications how to move done in the method for lamp box a little improve, it passes through
Photocell group is from motion tracking long-distance light light beam, the problem of to be directed at headlamp, but still exist above, as long as and mobile
Lamp box, just have and control the problems such as complicated caused by test position to be aligned, in addition to whole device is complicated, cost is high,
The problem of there is also in terms of reliability.
CN201620028136.8 will still move lamp box to shine before being directed at left and right two that are respectively aligned to tested vehicle
Lamp, simply improved in lamp box, be provided with light-intensity test element in detector body, the light-intensity test element it is upper
Side, downside, left side, right side are at least provided with a light-sensitive element.By driving detector body to move up and down so that lamp
Case more convenient and quicker when being directed at the headlamp of tested vehicle.Method disclosed in the patent, it is still as mentioned above special
Profit by mobile lamp box, it is necessary to be respectively aligned to the left and right headlamp of tested vehicle, therefore there are still by detecting position to be aligned
The problems such as complicated is controlled caused by putting, in addition to whole device is complicated, cost is high, there is also the problem of reliability aspect.
The content of the invention
A kind of the defects of it is an object of the invention to overcome prior art, there is provided simple, convenient, efficient car headlamp
Detection method.
Another object of the present invention is to provide to be exclusively used in the device of this detection method.
Car headlamp detection method of the present invention comprises the steps of：
First, the light source of tested vehicle right and left headlamp is gathered：With a number code-phase machine side to being detected automobile, while gather quilt
Examine the light source of vehicle right and left headlamp；
2nd, the projected spot of tested vehicle right and left headlamp is gathered：With another digital camera back to tested automobile, simultaneously
The hot spot of the tested vehicle right and left headlamp projection of collection on the projection screen；
3rd, Digital Image Processing：The data feeding computer for being gathered step (1), (two) by communication cable, and by
Supporting Digital Image Processing algorithm completes the detection to car headlamp.
Automobile headlight detecting device of the present invention is made up of light source collection and image procossing two parts, light source collection
It is made up of preceding digital camera, rear digital camera, projection screen, image processing apparatus is computer, and projection screen is arranged on away from inspection
The position of survey line 5-10 rice, base are fixedly mounted on the centre position of detection line and projection screen axis, preceding digital camera, after
Digital camera is arranged on base opposite to each other, and preceding digital camera faces detection line, and rear digital camera faces projection screen, digital camera
It it is 10 centimetres away from ground maximum height, preceding digital camera and rear digital camera are connected with network service cable with computer respectively.
The preceding digital camera of the present invention gathers the light source of tested vehicle right and left headlamp simultaneously；Digital camera gathers simultaneously afterwards
The hot spot of tested vehicle right and left headlamp projection on the projection screen；Computer is sent into via communication cable, and by supporting number
Word image processing algorithm completes the detection to car headlamp.
Preceding digital camera of the present invention and rear digital camera can be digital camera or video camera.
Projection screen of the present invention is common projection screen.Described projection screen can be that therefrom portion is distinguished to the left
The plug-type screen of the open-type screen or integrally-lifting of right opening or left and right, the purpose is to give upon completion of the assays
Tested automobile concedes track, its smooth is passed through.
Existing image processing software is installed in computer of the present invention.
Measuring principle of the present invention is as follows：
1. digital camera measuring principle：Digital camera is by camera lens, shutter control (time for exposure control), aperture control, figure
As collection sensor (CMOS-type or CCD type), camera control and image output interface (gigabit networking interface, or USB interface) group
Into.It is output to computer by interface after light spot image taken the photograph is digitized and handled.Digital camera resolution ratio (as
Plain size) determined by its image acquiring sensor.The brightness of light spot image is directly proportional to the luminous intensity of car headlamp.Hot spot
The edge of image, central point, the geometric position etc. of shade line are relevant with the pixel coordinate of light spot image, and by the figure of digital camera
As resolution ratio determines.By the digital image processing techniques in computer, in monochrome information and hot spot that hot spot can be extracted
The positional information of heart point, hot spot shade line edge and line feature point of transferring.
2. upper beam shines intensity detection principle：Headlamp is radiated at brightness (illumination, the measurement unit of hot spot on screen：
Lx, lux) directly reflect the luminous intensity (measurement unit of high beam：Cd, candela), that is, luminous intensity is bigger, it is bright
Degree is higher, and vice versa.Digital camera takes the photograph the institute on its CCD or cmos imaging front (sensor) of the light spot image on screen
The signal intensity of acquisition is directly proportional to hot spot brightness.Between the brightness of hot spot, the luminous intensity of car light, the distance of hot spot to car light
Mathematical relationship determined by formula (1).Formula explanation, the headlight beam illumination of hot spot and headlamp luminous intensity on screen
It is directly proportional, square it is inversely proportional to distance between car light with hot spot.
In formula：E is the illumination of hot spot, and I is the luminous intensity of car light, and L is distance of the hot spot to car light.
Light spot image is absorbed with digital camera, and the photograph of hot spot on screen is measured by image processing techniques and related algorithm
E and spot center point are spent to the distance L of car light, according to formula (1), so that it may obtain the luminous intensity values I of headlamp.
3. headlight optical axis offset Cleaning Principle：Optical axis -- refer to car light luminous point along light beam to screen its spot center
Straight line between point；Measuring line -- refer to car light luminous point to the parallel lines in the space of screen, as shown in Figure 3.Headlight optical axis
Offset detects, including：1) displacement of upper beam axle offset measuring line (horizontal and vertical directions)；2) dipped beam
The displacement of optical axis and shade line offset measurement datum line (horizontal and vertical directions) detects, as shown in Figure 4.According to screen
Curtain detection method, the hot spot of headlamp are radiated on distance 10m screen, its optical axis and measuring line (horizontal and vertical two
Direction) between displacement numerical value, be required measurement amount.Its value size, determines whether headlamp installation site closes symbol regulation.
The screen of apparatus of the present invention is 5m away from headlamp, as shown in figure 4, the principle according to triangle geometry, the d2 for measuring gained is d1's
1/2, d1 is calculated according to d2 cans.According to digital camera imaging principle, the light spot image on digital camera is gone forward for screen
The imaging of illuminator hot spot, the image are made up of all pixels, and the number of pixel is determined by digital camera resolution ratio.On screen
The central point of hot spot, namely the intersection point of headlight optical axis and screen, the coordinate of the corresponding pixel points on the image of digital camera,
It can be calculated by image processing algorithm；The position of measuring line can also be measured by digital camera, and equivalent on screen.
Measuring line has corresponding pixel corresponding with intersection point, the spot center point of screen on the image of hot spot.That is, screen
The offset of upper optical axis, the displacement between pixel on image can be equivalent to, thus, according to image processing techniques and algorithm, you can
Calculate the displacement between actual optical axis and measuring line.
4. car light luminous intensity correction principle：Due to the deviation of headlamp setting angle, and different automobile types car light position
It is different, horizontal range d1, the vertical range d2 that facula position of the car light on screen deviates measuring line are different, lead
The length of cause car light optical axis is an amount changed relative to the horizontal range of car light to screen, according to formula (1), hot spot brightness
With square being inversely proportional for the distance of light source to hot spot, the change of optical axis will influence the brightness of hot spot.Therefore, to being radiated on screen
The brightness of the hot spot of diverse location will be corrected.Method is level, vertical shift d1, d2 first obtained according to measurement, to calculate
Go out the length of each optical axis, then be corrected according to formula (1).
5. light shaft offset amount correction principle：Because light spot image is in digital camera images collection sensor (CMOS-type or CCD
Type) imaging front on mapping be a Nonlinear Mapping.That is, equidistant two points, if position in the center portion position of screen, with
Position is in the marginal portion of screen, and it is on digital camera imaging front, distance between the pixel of two dot images (including water
Square to and vertical direction) be unequal, problem of nonlinear mapping be present.It must be corrected.The present invention is directed to this
One problem is corrected.Method is：The method being combined is measured according to digital camera imaging principle and actually, in screen
The image of the luminous point of diverse location is demarcated, and correction parameter storage is used for measurement in real time in a computer.
Phase of the invention has following advantage compared with conventional lightbank movable type detector：
| Project | The present invention | Conventional lightbank movable type detector |
| Complete the detection speed of a car | ＜ 15 seconds | More than 60 seconds |
| Detection error | ≤ ± 5% | ≤ ± 10% |
| Device structure and reliability | Simply, reliably | Complexity, easily it is out of order |
| Cost | It is low, only traditional 1/3 | It is high |
| Maintainability | Easily safeguard | Not easy care |
Detection method of the present invention is extremely simple and accurate, is mainly used in the upper beam of car headlamp according to strong
Degree, the detection of light shaft offset degree；Dipped headlight light and shade line position and drift rate detection.Of the invention and current car headlamp detection method
And device is entirely different, when being detected, without making any movement and headlamp being aligned, detection process is automatically complete
Into reliable, low cost, is the innovation to direct screen detection method without manually being measured.Measurement distance of the present invention is 5-10
Rice, ensure that high measurement accuracy and low measurement error from measuring method.Detection efficiency of the present invention is high, and detection is accurate, simplifies inspection
Flow gauge, there is good promotional value.
Brief description of the drawings
Fig. 1 is schematic structural view of the invention.
Fig. 2 is principle of the invention figure.
Fig. 3 is light shaft offset range measurement schematic diagram.
Fig. 4 is optical axis level, vertical shift range measurement schematic diagram.
In figure：Digital camera before 1-, digital camera after 2-, 3- projection screens, 4- computers, 5- bases, A- car lights, B- light
Spot, C- optical axises, d1- optical axis horizontal-shift distances, optical axis horizontal-shift datum line of the d2- car lights at the distance of projection screen 1/2
Distance, E- measuring lines, F- light shaft offset distances, h1- optical axis vertical shift distances, h2- car lights to the distance of projection screen 1/2
The optical axis vertical shift datum line distance at place.
Embodiment
Embodiment：
What the present invention was realized in：First do equipment installation.
The projection screen 3 of the present apparatus is arranged in the detection workshop of qualified vehicle inspection and test station (with respect to the ring of shading
In border), the position away from detection line 5-10 rice, this measurement distance is that high measurement accuracy and low measurement are ensure that from measuring method
Error.General to use 5 meters, conditional place may extend to 10 meters.Described projection screen is common projection screen.Projection screen
Curtain 3 can be fixedly mounted, but so be inconvenient to detect finish automobile by, it is therefore preferred that using can be therefrom portion respectively to
The open-type screen or the plug-type screen of integrally-lifting or left and right (ground attachment rail) that left and right is opened.Its size
The hot spot for being detected left and right two headlamps of automobile for energy all standing while being irradiated on screen is limited, and the present embodiment is 2.2 meters of x
1.8 rice.
Base 5 is fixedly mounted on the centre position of detection line and the axis of projection screen 3, preceding digital camera 1, rear digital phase
Machine 2 is arranged on base 5 opposite to each other, and preceding digital camera 1 faces detection line, and rear digital camera 2 faces projection screen 3, digital camera
1st, 2 be 10 centimetres (being less than automobile chassis) away from ground maximum height, and such height primarily to be detected upon completion of the assays
Automobile smooth can pass through.
Preceding digital camera 1 and rear digital camera 2 are connected with network service cable with computer 4 respectively.
Detection method：
Preceding digital camera gathers the light source of tested vehicle right and left headlamp simultaneously；Digital camera gathers tested automobile simultaneously afterwards
The hot spot of left and right headlamp projection on the projection screen；Computer is sent into via communication cable, and by supporting digital picture
Adjustment method completes the detection to car headlamp.
When being detected, tested automobile is parked in detection line side, and the headlamp of automobile is overlapped with detection line, and base 5 is installed
At 2.5 meters away from detection line, digital camera 1,2 is arranged on base 5 opposite to each other, and screen 3 is arranged on the end of detection zone, distance inspection
5 meters of survey line.
When detection starts, two digital cameras under the control of the computer, according to the method described in measuring principle 1-5, successively
Detection environment (background) brightness, preceding photograph high beam, dipped headlight centre of luminescence position, the brightness of high beam hot spot and light shaft offset degree,
Dipped headlight optical axis and hot spot edge foldline position.Detection is completed after computer is calculated with image processing algorithm, provides detection knot
Fruit.
After detection terminates, screen is opened, allows tested automobile to roll away from.
Claims (2)
1. a kind of car headlamp detection method, it is characterised in that comprise the steps of：
First, the light source of tested vehicle right and left headlamp is gathered：With a number code-phase machine side to being detected automobile, while gather tested vapour
The light source of car or so headlamp；
2nd, the projected spot of tested vehicle right and left headlamp is gathered：With another digital camera back to tested automobile, gather simultaneously
The hot spot of tested vehicle right and left headlamp projection on the projection screen；
3rd, Digital Image Processing：The data for being gathered step (1), (two) by communication cable are sent into computer, and by supporting
Digital Image Processing algorithm complete detection to car headlamp.
2. automobile headlight detecting device used by car headlamp detection method as claimed in claim 1, its feature exist
Formed in by light source collection and image procossing two parts, light source is gathered by preceding digital camera (1), rear digital camera (2), projection screen
Curtain (3) is formed, and image processing apparatus is computer (4), and projection screen (3) is arranged on the position away from detection line 5-10 rice, base
(5) centre position of detection line and projection screen (3) axis, preceding digital camera (1), rear digital camera (2) are fixedly mounted on
It is arranged on opposite to each other on base (5), preceding digital camera (1) faces detection line, and rear digital camera (2) faces projection screen (3), digital
Camera (1), (2) are 10 centimetres away from ground maximum height, and preceding digital camera (1) and rear digital camera (2) use network service respectively
Cable is connected with computer (4).
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| CN201710909649.9A CN107702898A (en) | 2017-09-29 | 2017-09-29 | A kind of car headlamp detection method and device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710909649.9A CN107702898A (en) | 2017-09-29 | 2017-09-29 | A kind of car headlamp detection method and device |
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| Publication Number | Publication Date |
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| CN107702898A true CN107702898A (en) | 2018-02-16 |
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Cited By (10)
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|---|---|---|---|---|
| CN111044267A (en) * | 2019-12-28 | 2020-04-21 | 佛山市华控电机科技有限公司 | High beam calibrator calibration device and method for headlamp detector |
| CN111047648A (en) * | 2018-10-15 | 2020-04-21 | 浙江宇视科技有限公司 | Angle correction method and device |
| CN112101230A (en) * | 2020-09-16 | 2020-12-18 | 招商局重庆公路工程检测中心有限公司 | Method and system for detecting starting of headlamps of vehicles passing through highway tunnel |
| CN112129496A (en) * | 2020-08-27 | 2020-12-25 | 黄冈格罗夫氢能汽车有限公司 | Delivery dimming test system for headlamp of fuel cell hydrogen energy automobile |
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| CN112747906A (en) * | 2021-01-28 | 2021-05-04 | 歌尔光学科技有限公司 | Light source detection method, detection device and readable storage medium |
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| CN115867781A (en) * | 2020-08-25 | 2023-03-28 | M·皮希泰利 | Apparatus and method for measuring far field luminous intensity and color characteristics of light source |
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| CN111047648A (en) * | 2018-10-15 | 2020-04-21 | 浙江宇视科技有限公司 | Angle correction method and device |
| CN111047648B (en) * | 2018-10-15 | 2023-09-19 | 浙江宇视科技有限公司 | Angle correction method and device |
| CN111044267B (en) * | 2019-12-28 | 2021-09-21 | 佛山市华控电机科技有限公司 | High beam calibrator calibration device and method for headlamp detector |
| CN111044267A (en) * | 2019-12-28 | 2020-04-21 | 佛山市华控电机科技有限公司 | High beam calibrator calibration device and method for headlamp detector |
| CN115867781B (en) * | 2020-08-25 | 2024-02-09 | M·皮希泰利 | Apparatus and method for measuring far field luminous intensity and color characteristic of light source |
| CN115867781A (en) * | 2020-08-25 | 2023-03-28 | M·皮希泰利 | Apparatus and method for measuring far field luminous intensity and color characteristics of light source |
| CN112129496A (en) * | 2020-08-27 | 2020-12-25 | 黄冈格罗夫氢能汽车有限公司 | Delivery dimming test system for headlamp of fuel cell hydrogen energy automobile |
| CN112229610A (en) * | 2020-09-14 | 2021-01-15 | 一汽奔腾轿车有限公司 | System and method for calibrating adaptive matrix high beam position of passenger vehicle |
| CN112101230A (en) * | 2020-09-16 | 2020-12-18 | 招商局重庆公路工程检测中心有限公司 | Method and system for detecting starting of headlamps of vehicles passing through highway tunnel |
| CN112101230B (en) * | 2020-09-16 | 2024-05-14 | 招商局重庆公路工程检测中心有限公司 | Method and system for detecting opening of head lamp of road tunnel passing vehicle |
| CN112747906A (en) * | 2021-01-28 | 2021-05-04 | 歌尔光学科技有限公司 | Light source detection method, detection device and readable storage medium |
| CN115144786A (en) * | 2021-03-29 | 2022-10-04 | 常州星宇车灯股份有限公司 | Device and method for synchronously detecting left lamp panel and right lamp panel of penetrating tail lamp |
| CN113092080A (en) * | 2021-04-28 | 2021-07-09 | 中车长春轨道客车股份有限公司 | Auxiliary calibrating device for urban rail train headlamp |
| CN117288095A (en) * | 2023-11-27 | 2023-12-26 | 浙江极氪汽车研究开发有限公司 | Detection device and method for threshold floor lamp |
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Application publication date: 20180216 |