CN103353345A - Motor vehicle headlamp detector light intensity detection method - Google Patents
Motor vehicle headlamp detector light intensity detection method Download PDFInfo
- Publication number
- CN103353345A CN103353345A CN2013102931037A CN201310293103A CN103353345A CN 103353345 A CN103353345 A CN 103353345A CN 2013102931037 A CN2013102931037 A CN 2013102931037A CN 201310293103 A CN201310293103 A CN 201310293103A CN 103353345 A CN103353345 A CN 103353345A
- Authority
- CN
- China
- Prior art keywords
- light intensity
- value
- headlamp
- motor vehicle
- light
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Landscapes
- Lighting Device Outwards From Vehicle And Optical Signal (AREA)
Abstract
A motor vehicle headlamp detector light intensity detection method is disclosed. The method has the following steps that firstly, a headlamp detector calibrator is used to calibrate the headlamp detector, a calibrator illumination intensity is set to be a fixed value (CD), calibrator optical axis offset values (angles) are arranged on different verification points respectively, and a corresponding light intensity value f (xi, yi) of the headlamp detector is read and recorded; secondly, the light intensity value f (xi, yi) carries out light intensity curving surface fitting; finally, when the motor vehicle headlamp irradiates as the different optical axis offset values (angles), the headlamp detector corrects the read light intensity value through a light intensity curving surface equation so as to obtain the real light intensity value of the headlamp. By using the method of the invention, problems that an operand is large, time consuming is severe and so on in an original fitting method are overcome so as to guarantee accuracy of detection of the headlamp detector.
Description
Technical field
The present invention relates to information of safety inspection for motor vehicles equipment, particularly relate to a kind of light intensity detection method for motor vehicle head light detector.
Background technology,
Headlamp be motor vehicle at night or under the lower condition of visibility, the visual plant of carriage way illumination is provided for the driver, also be the light signalling device that the driver sends caution, gets in touch with.Detection of headlight is the big event of automobile safety Performance Detection, must meet the requirement of GB 7258 " motor vehicle safe and technical specification ".Under normal circumstances, the long-distance light characteristics of luminescence, its photometric distribution such as elliptical shape are at above-below direction and left and right directions almost symmetry, and the closer to central point, irradiance is larger.
Headlamp aligner is as the detecting instrument of headlamp, wherein mainly adopt the english abbreviation of CCD(imageing sensor for the detection of headlamp luminous intensity) distant light irradiation is taken to the light beam of plane skylight, the point that light intensity is stronger, its gray-scale value on photographic images is larger, and hot spot is whiter; The point that light intensity is less, its gray-scale value on photographic images is less, and hot spot is darker, and the digital quantity of gray-scale value just can connect with the brightness value that external light source shines on the detector like this.The light signal that collects is converted into the principle of electric signal, and finally by image pick-up card the electric signal of simulating is converted into digital signal, output to computing machine, processed by computer data processing system, just can measure the long-distance light luminous intensity.
But, headlamp aligner detect identical luminous intensity, direction of illumination exist certain deflection angle (upper 2 °, lower 3 °, left 3 °, right 3 °) headlamp the time, resulting maximum gradation value (being the central point gray-scale value) is inconsistent, thereby causes the measured value of light intensity inconsistent.Trace it to its cause, because the illumination of area array CCD off-axis image point is relevant with field angle, when the imaging image source in the CCD photosurface during away from the imaging optical axis of optical lens system, its illuminance will be successively decreased by cos4 ω speed, produce optical defocus, therefore picture horizontal edge illumination is far below center illumination.When the distance of CCD camera and headlamp to be measured was limited in the narrow scope, the gradation of image distortion that optical defocus causes during close-up photography was more serious.Therefore, when the distance light of identical light intensity shone screen by different directions, the measured value that obtains light intensity was inconsistent.
For the metering performance that meets JJG 745 " motor vehicle head light detector vertification regulation " requires: when 1. light shaft offset value (angle) is zero, the error of indication of light intensity is not more than ± and 12%, 2. during the arbitrary value of light shaft offset value (angle) in the calibrating scope, the error of indication of light intensity is not more than ± and 15%, must carry out to instrument the demarcation of difference, then calibration point is fitted to the light intensity curved surface, the light intensity value with non-calibration point is modified to real light intensity value at last.But counting that instrument is demarcated is more, and during match light intensity curved surface, there are the problems such as operand is huge, serious consuming time in traditional computing method, therefore need to seek the way of simple possible.
Summary of the invention
The object of the invention is to for above-mentioned existing problems and deficiency, be provided a kind of detection time that both can effectively reduce headlamp aligner, can fully guarantee again the motor vehicle head light detector light intensity detection method of its accuracy in detection.
Technical scheme of the present invention is achieved in that
Motor vehicle head light detector light intensity detection method of the present invention is characterized in that may further comprise the steps:
A, utilize the headlamp aligner calibrating device that headlamp aligner is demarcated, the luminous intensity of calibrating device is placed a fixed value, the light shaft offset angle of calibrating device is placed respectively different verification calibrating points, read and record the variant verification calibrating point position corresponding luminous intensity indicating value f(x of headlamp aligner
i, y
i);
B, to each luminous intensity indicating value f(x of above-mentioned record
i, y
i) carry out the light intensity surface fitting, obtain the light intensity surface equation;
C, utilize the light intensity surface equation among the above-mentioned steps b, headlamp aligner is revised the luminous intensity indicating value that the headlamp that reads is positioned at each deviation angle point place, obtains the real light intensity value of headlamp.
Wherein, the calibrating of the verification described in above-mentioned steps a point comprises some reference points position as shown in table 1;
Among the above-mentioned steps b to each luminous intensity indicating value f(x
i, y
i) carry out some discrete function values that the light intensity surface fitting refers to known certain function, by adjusting some undetermined coefficients in this function, so that the difference of this function and known point set is minimum, comprise following process:
(3-1) because required curved surface is axisymmetric about y, so fixing x constructs m least square fitting polynomial expression to y:
……
Wherein, L is the number of times of fitting of a polynomial;
(3-2) above-mentioned match has been guaranteed x in certain fixed value, when y gets different value, and the accuracy of light intensity curved surface.But when x, y peek not fixedly the time, in order to guarantee the accuracy of light intensity curved surface, also need further interpolation arithmetic;
So-called " interpolation " inserts some needed new functional values exactly again in the middle of given function table.Its basic thought is: at first manage to construct a simple function y (x) as the approximate expression of f (x) according to existing functional value, and then the value of calculating y (x) is to obtain the approximate value of f (x);
Make that variable y is constant, the set-point of x done interpolation arithmetic, obtain m about the polynomial of one indeterminate of x:
……
Therefore the equation of light intensity curved surface is:
Advantage of the present invention is:
The light intensity that the present invention is directed to motor vehicle head light detector is demarcated Quadratic Surface Fitting algorithm complexity, proposed on the basis that does not change the instrument hardware configuration, according to the characteristics of headlamp aligner light intensity curved surface, by the rear order of " interpolation " of elder generation's " match ", guarantee the accuracy of non-calibration point.So, when instrument detected headlamp, the vehicle head lamp of different deviation angles had according to revising, and draws actual value.The present invention had both guaranteed the check point accuracy of all different deviation angles, had solved again luminance loss's problem that original light intensity detects, and had also avoided simultaneously in the testing process light intensity to calculate the problems such as unavoidable operand is huge, serious consuming time.This method can guarantee that the result has good repeatability simultaneously.Detection method of the present invention has advantages of that detection speed is fast, accuracy of detection is high especially.
The present invention is further illustrated below in conjunction with accompanying drawing.
Description of drawings
Fig. 1 is the headlamp aligner equipment schematic.
Fig. 2 is that light intensity is identical but detection of headlight sampled data figure that deflection angle is different.
Fig. 3 is sampled data and the fitting data comparison diagram of detection of headlight.
Embodiment
Motor vehicle head light detector light intensity detection method of the present invention may further comprise the steps:
A, utilize the headlamp aligner calibrating device that headlamp aligner is demarcated, the luminous intensity of calibrating device is placed a fixed value, the light shaft offset angle of calibrating device is placed respectively different verification calibrating points, read and record the variant verification calibrating point position corresponding luminous intensity indicating value f(x of headlamp aligner
i, y
i);
B, to each luminous intensity indicating value f(x of above-mentioned record
i, y
i) carry out the light intensity surface fitting, obtain the light intensity surface equation;
C, utilize the light intensity surface equation among the above-mentioned steps b, headlamp aligner is revised the luminous intensity indicating value that the headlamp that reads is positioned at each deviation angle point place, obtains the real light intensity value of headlamp.
Wherein, the calibrating of the verification described in above-mentioned steps a point comprises some reference points position as shown in table 1;
Among the above-mentioned steps b to each luminous intensity indicating value f(x
i, y
i) carry out some discrete function values that the light intensity surface fitting refers to known certain function, by adjusting some undetermined coefficients in this function, so that the difference of this function and known point set is minimum, comprise following process:
(3-1) because required curved surface is axisymmetric about y, so fixing x constructs m least square fitting polynomial expression to y:
……
Wherein, L is the number of times of fitting of a polynomial;
(3-2) above-mentioned match has been guaranteed x in certain fixed value, when y gets different value, and the accuracy of light intensity curved surface.But when x, y peek not fixedly the time, in order to guarantee the accuracy of light intensity curved surface, also need further interpolation arithmetic;
So-called " interpolation " inserts some needed new functional values exactly again in the middle of given function table.Its basic thought is: at first manage to construct a simple function y (x) as the approximate expression of f (x) according to existing functional value, and then the value of calculating y (x) is to obtain the approximate value of f (x);
Make that variable y is constant, the set-point of x done interpolation arithmetic, obtain m about the polynomial of one indeterminate of x:
……
Therefore the equation of light intensity curved surface is:
As shown in Figure 1, the light that sends certain light intensity when headlamp detector calibrating device or headlamp 1 according to assigned direction is incident upon on the plane skylight 3 through the Fresnel Lenses 2 of headlamp aligner, and CCD camera 4 is taken the image of plane skylights 3.Then send in the computing machine that contains video frequency collection card, carry out image processing and analyzing.Computer acquisition to the luminous point 2-D gray image be f(x, y), f(x, y) corresponding light distribution on the gray level image, wherein, x has represented the columns of respective point pixel position on image, y has represented the line number of respective point pixel position on image.The point that light intensity is stronger, its gray-scale value on image is larger, and hot spot is whiter; The point that light intensity is less, its gray-scale value on image is less, and hot spot is darker.Therefore can be with the gray-scale value of the regional center point of light intensity maximum as the yardstick of weighing intensity of light, this gray-scale value calibrated and calculated intensity of light on assigned direction that utilization collects.
The headlamp calibrating device is the rotary standard sources of optical axis, it partly is comprised of light source, D.C. regulated power supply and voltage table, optical angle rotation and reading mechanism, horizontal adjusting mechanism and alignment mechanism etc., as shown in Figure 2, up/down, the left/right knob of distance light calibrating device direction of illumination deflection angle are all placed 0, luminous intensity values is set as 15 000cd, headlamp aligner records its largest light intensity value f(0,0) (being the central point gray-scale value); Then up/down, the left/right knob with distance light calibrating device direction of illumination deflection angle rotates a certain angle, and luminous intensity values arranges constant, and headlamp aligner records its largest light intensity value f(x, y) (being the central point gray-scale value).But resulting maximum gradation value is inconsistent, thereby cause the measured value of light intensity inconsistent, see Table 1, x is that ("-" represents left for the deflection angle value of headlamp calibrating device in the table, "+" expression is to the right), y be up and down the off-set value angle value ("-" expression is downward, "+" expression is upwards), f(x, y) be the detection of headlight apparatus measuring value:
Calibration point actual value can be modified in the upper table, but for non-calibration point (be-1.5 such as left and right sides off-set value, off-set value is up and down), owing to can't obtain the measured value of this point, therefore actual value can't be modified at-1.5 o'clock.So above calibration point is carried out match, by the surface equation of match, just can ask the measured value that obtains having a few, thereby revise.
Experimental verification:
The calibration point light intensity value of the surface equation gained by the said method match sees Table 2:
Can find out from table 1 and table 2, the numerical value that calculates by surface equation and the maximum relative standard deviation of demarcating between the numerical value are 1.7%, therefore meet measuring requirement.
The invention has the beneficial effects as follows, a kind of binary curved surface fitting method that can reduce operand, guarantee the match accuracy is provided, thereby guarantee the accuracy that headlamp aligner detects.
The present invention describes by embodiment, but the present invention is not construed as limiting, with reference to description of the invention, other variations of the disclosed embodiments, easily expect such as the professional person for this area, such variation should belong within the claim restricted portion of the present invention.
Claims (3)
1. motor vehicle head light detector light intensity detection method is characterized in that may further comprise the steps:
A, utilize the headlamp aligner calibrating device that headlamp aligner is demarcated, the luminous intensity of calibrating device is placed a fixed value, the light shaft offset angle of calibrating device is placed respectively different verification calibrating points, read and record the variant verification calibrating point position corresponding luminous intensity indicating value f(x of headlamp aligner
i, y
i);
B, to each luminous intensity indicating value f(x of above-mentioned record
i, y
i) carry out the light intensity surface fitting, obtain the light intensity surface equation;
C, utilize the light intensity surface equation among the above-mentioned steps b, headlamp aligner is revised the luminous intensity indicating value that the headlamp that reads is positioned at each deviation angle point place, obtains the real light intensity value of headlamp.
2. described motor vehicle head light detector light intensity detection method according to claim 1 is characterized in that the verification calibrating point described in the above-mentioned steps a comprises some reference points position as shown in table 1;
。
3. described motor vehicle head light detector light intensity detection method according to claim 1 is characterized in that among the above-mentioned steps b each luminous intensity indicating value f(x
i, y
i) carry out some discrete function values that the light intensity surface fitting refers to known certain function, by adjusting some undetermined coefficients in this function, so that the difference of this function and known point set is minimum, comprise following process:
(3-1) because required curved surface is axisymmetric about y, so fixing x constructs m least square fitting polynomial expression to y:
……
Wherein, L is the number of times of fitting of a polynomial;
(3-2) above-mentioned match has been guaranteed x in certain fixed value, when y gets different value, and the accuracy of light intensity curved surface;
But when x, y peek not fixedly the time, in order to guarantee the accuracy of light intensity curved surface, also need further interpolation arithmetic;
So-called " interpolation " inserts some needed new functional values exactly again in the middle of given function table;
Its basic thought is: at first manage to construct a simple function y (x) as the approximate expression of f (x) according to existing functional value, and then the value of calculating y (x) is to obtain the approximate value of f (x);
Make that variable y is constant, the set-point of x done interpolation arithmetic, obtain m about the polynomial of one indeterminate of x:
……
Therefore the equation of light intensity curved surface is:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310293103.7A CN103353345B (en) | 2013-07-13 | 2013-07-13 | A kind of motor vehicle headlamp detector light intensity detection method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310293103.7A CN103353345B (en) | 2013-07-13 | 2013-07-13 | A kind of motor vehicle headlamp detector light intensity detection method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103353345A true CN103353345A (en) | 2013-10-16 |
| CN103353345B CN103353345B (en) | 2016-02-03 |
Family
ID=49309739
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310293103.7A Expired - Fee Related CN103353345B (en) | 2013-07-13 | 2013-07-13 | A kind of motor vehicle headlamp detector light intensity detection method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103353345B (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104849024A (en) * | 2014-12-19 | 2015-08-19 | 北汽福田汽车股份有限公司 | Evaluation method for vehicle headlight |
| CN107884162A (en) * | 2017-10-27 | 2018-04-06 | 斯比夫（西安）照明技术有限公司 | A kind of method that locomotive whole-vehicle illuminance is measured using 9 methods |
| CN108510755A (en) * | 2017-03-07 | 2018-09-07 | 詹水旺 | A kind of method of automatic identification Misuse dazzle light |
| CN109100119A (en) * | 2018-07-24 | 2018-12-28 | 上海时代之光照明电器检测有限公司 | For testing the method and system of lamps and lanterns |
| CN109115333A (en) * | 2018-08-06 | 2019-01-01 | Oppo广东移动通信有限公司 | The detection method and detection system of laser projecting apparatus |
| 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 |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2046456U (en) * | 1988-11-16 | 1989-10-25 | 王银明 | Headlight light detecting device for motor vehicle |
| US5426500A (en) * | 1994-01-04 | 1995-06-20 | Chuo Electronic Measurement Co., Ltd. | Illuminance measurement of vehicle lamp |
| CN1967178A (en) * | 2005-11-18 | 2007-05-23 | 佛山市南华仪器有限公司 | High beam light-emitting intensity detecting method of vehicular head light detector and detecting mechanism thereof |
| JP2009109469A (en) * | 2007-10-30 | 2009-05-21 | Watanabe Denki Kogyo Kk | Method and device for measuring irradiation light of headlight for vehicle |
| JP2010071807A (en) * | 2008-09-18 | 2010-04-02 | Stanley Electric Co Ltd | Photometric method for light source bulb for vehicle lighting fixture and light emitting property model generation method |
| CN103162943A (en) * | 2011-12-08 | 2013-06-19 | 福特全球技术公司 | Automotive headlamp aiming insensitive to intensity variations |
-
2013
- 2013-07-13 CN CN201310293103.7A patent/CN103353345B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2046456U (en) * | 1988-11-16 | 1989-10-25 | 王银明 | Headlight light detecting device for motor vehicle |
| US5426500A (en) * | 1994-01-04 | 1995-06-20 | Chuo Electronic Measurement Co., Ltd. | Illuminance measurement of vehicle lamp |
| CN1967178A (en) * | 2005-11-18 | 2007-05-23 | 佛山市南华仪器有限公司 | High beam light-emitting intensity detecting method of vehicular head light detector and detecting mechanism thereof |
| JP2009109469A (en) * | 2007-10-30 | 2009-05-21 | Watanabe Denki Kogyo Kk | Method and device for measuring irradiation light of headlight for vehicle |
| JP2010071807A (en) * | 2008-09-18 | 2010-04-02 | Stanley Electric Co Ltd | Photometric method for light source bulb for vehicle lighting fixture and light emitting property model generation method |
| CN103162943A (en) * | 2011-12-08 | 2013-06-19 | 福特全球技术公司 | Automotive headlamp aiming insensitive to intensity variations |
Non-Patent Citations (1)
| Title |
|---|
| 杨春生,张涛: "汽车前照灯仪校准器的CCD检测系统研究", 《计量技术》, no. 10, 31 October 2005 (2005-10-31), pages 37 - 39 * |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104849024A (en) * | 2014-12-19 | 2015-08-19 | 北汽福田汽车股份有限公司 | Evaluation method for vehicle headlight |
| CN104849024B (en) * | 2014-12-19 | 2018-05-11 | 北汽福田汽车股份有限公司 | The evaluating method of automotive headlamp |
| CN108510755A (en) * | 2017-03-07 | 2018-09-07 | 詹水旺 | A kind of method of automatic identification Misuse dazzle light |
| CN107884162A (en) * | 2017-10-27 | 2018-04-06 | 斯比夫（西安）照明技术有限公司 | A kind of method that locomotive whole-vehicle illuminance is measured using 9 methods |
| CN109100119A (en) * | 2018-07-24 | 2018-12-28 | 上海时代之光照明电器检测有限公司 | For testing the method and system of lamps and lanterns |
| CN109115333A (en) * | 2018-08-06 | 2019-01-01 | Oppo广东移动通信有限公司 | The detection method and detection system of laser projecting apparatus |
| 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 |
| 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103353345B (en) | 2016-02-03 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103353345B (en) | A kind of motor vehicle headlamp detector light intensity detection method | |
| EP3100002B1 (en) | Camera calibration method | |
| CN106524922B (en) | Ranging calibration method, device and electronic equipment | |
| US20180120687A1 (en) | Ranging method, automatic focusing method and device | |
| CN104568963A (en) | Online three-dimensional detection device based on RGB structured light | |
| CN104296968B (en) | The modulation transfer function test method of multichannel CCD | |
| CN109714535A (en) | A kind of auto-focusing machine vision metrology device and method based on color difference | |
| CN102342090A (en) | Image capturing device, operator monitoring device, method for measuring distance to face, and program | |
| JPS6363849B2 (en) | ||
| CN102892027A (en) | System and method for measuring frame delay time of photographic system of optical measurement equipment | |
| CN102818555A (en) | System and method for measuring a distance to an object | |
| WO2020211576A1 (en) | Method and device for dual light fusion | |
| CN105530437A (en) | Environment brightness measurement and calculation method and shooting device | |
| CN108844494A (en) | Method based on optical means detection glasses curvature of curved surface parameter | |
| CN204287060U (en) | A kind of online three-dimensional detection device based on RGB structured light | |
| CN105445570B (en) | Wide-angle lens camera signal-to-noise ratio testing system and measuring method | |
| US20210281734A1 (en) | Information processing apparatus, information processing method and computer readable medium | |
| CN106950793B (en) | A kind of real-time method for obtaining motorized zoom lens imaging viewing field angle | |
| CN102494640B (en) | Mounting precision detector of infrared product | |
| EP3121588B1 (en) | Optical characteristic measuring apparatus | |
| KR101961479B1 (en) | Apparatus and method for measuring optical center in camera module | |
| KR101653649B1 (en) | 3D shape measuring method using pattern-light with uniformity compensation | |
| CN205305023U (en) | Digital detecting system of optics camera | |
| CN103063165A (en) | Photoelectric angle transducer | |
| JP7468002B2 (en) | Anomaly display device, anomaly display system, anomaly display method, and anomaly display program |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C53 | Correction of patent of invention or patent application | ||
| CB02 | Change of applicant information |
Address after: 528041 No. 97, Jianxin Road, Chancheng District, Guangdong, Foshan Applicant after: FOSHAN ANALYTICAL INSTRUMENT Co.,Ltd. Address before: 528041 Port Road 16, Chancheng District, Guangdong, Foshan Applicant before: FOSHAN ANALYTICAL INSTRUMENT Co.,Ltd. |
|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160203 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |