CN108195568B - Centering self-checking and calibrating method for headlamp illuminance detection device - Google Patents
Centering self-checking and calibrating method for headlamp illuminance detection device Download PDFInfo
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- CN108195568B CN108195568B CN201711303183.4A CN201711303183A CN108195568B CN 108195568 B CN108195568 B CN 108195568B CN 201711303183 A CN201711303183 A CN 201711303183A CN 108195568 B CN108195568 B CN 108195568B
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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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Abstract
The invention relates to a centering self-checking and calibrating method of a headlamp illuminance detection device, which comprises the following steps: positioning the position of the illuminance detection device on the locomotive track; turning on a photoelectric imaging device on the illuminance detection device, shooting an image of a locomotive headlamp, and acquiring the offset position of the central point of the locomotive headlamp relative to the optical axis point of the photoelectric imaging device; and adjusting the position of the photometric probe to enable the central point of the photometric probe to be positioned on a reference shaft of the locomotive headlamp, so that the photometric probe and the tested locomotive headlamp are centered. The invention adopts the photoelectric imaging device to shoot the locomotive headlamp image, utilizes the image processing technology to obtain the deviation value of the central point of the detector relative to the central point of the headlamp, and then automatically adjusts the central point of the detector to the headlamp reference shaft through calculation, thereby realizing the automatic detection and automatic centering of the position of the detector without manual judgment and operation, saving time and labor, having high detection accuracy and more accurate centering.
Description
Technical Field
The invention relates to a technology for detecting the illuminance of a headlamp in rail transit, in particular to a centering self-checking and calibrating method for a headlamp illuminance detection device.
Background
The head lamps of rail traffic, such as locomotives and motor cars, have standard requirements and need to meet certain technical conditions. The illuminance detection device is a device for detecting the height of the center of light of a headlamp and the irradiation distance. Before the locomotive headlamp is detected, the illuminance detection device needs to adjust the position of the detector to enable the central point of the detector to be located on a reference axis of the headlamp, so that centering is performed, and subsequent illuminance detection can be guaranteed to be correct and reliable. At present, the detection and adjustment of the position of the detector are generally finished by emitting centering laser, judging by manual visual inspection and manual adjustment, which is time-consuming, labor-consuming and inaccurate.
Disclosure of Invention
The invention aims to solve the technical problems and provides a centering self-checking and calibrating method of a headlamp illuminance detection device, the detection and the adjustment of the position of a detector are automatically completed by the device without manual judgment and operation, time and labor are saved, the detection accuracy is high, and the adjustment of the position of the detector is more accurate.
The technical problem of the invention is mainly solved by the following technical scheme: the invention discloses a centering self-checking and calibrating method of a headlamp illuminance detection device, which comprises the following steps:
① locating the position of the illuminance detection device on the locomotive track;
② turning on a digital camera on the illuminance detection device, shooting an image of the locomotive headlamp, and acquiring the offset position of the central point of the locomotive headlamp relative to the optical axis point of the digital camera;
③ the position of the luminosity probe is adjusted to make the central point of the luminosity probe on the reference axis of the locomotive headlight to realize the alignment of the luminosity probe and the locomotive headlight to be tested, in the technical scheme, the installation position of the digital camera and the installation position of the luminosity probe are very close, when the distance between the illuminance detection device and the locomotive to be tested exceeds a certain value, the position of the digital camera and the position of the luminosity probe can be regarded as the same position, and the optical axis point of the digital camera and the central point of the luminosity probe can be regarded as the same point.
Preferably, the step ① includes turning on a laser range finder on the illuminance detection device when the illuminance detection device is on the locomotive track, measuring the distance between the target and the illuminance detection device, moving the target along the locomotive track to find a position 60 meters away from the illuminance detection device and mark the position, and driving the locomotive to the mark position to stop to achieve horizontal positioning of the illuminance detection device and the locomotive.
Preferably, the step ① includes selecting a type of the locomotive to be tested in a test interface of the illuminance detection device, storing the height data of the locomotive headlamp matched with the type of the locomotive to be tested in a database, automatically calling the height data by the illuminance detection device to drive the lifting mechanism, and controlling the illuminance probe to lift to a specified height position.
Preferably, the step ③ is calculating the horizontal angle and distance between the center point of the head lamp of the locomotive and the optical axis point of the digital camera, driving the posture adjusting mechanism of the photometric probe through calculation and processing, adjusting the pitch angle and/or the yaw angle of the photometric probe, so that the center point of the head lamp of the locomotive and the optical axis point of the digital camera coincide, that is, the center point of the photometric probe is located on the reference axis of the head lamp of the locomotive, so as to realize the alignment of the photometric probe and the head lamp of the locomotive to be tested.
Preferably, the method for calculating the horizontal included angle between the central point of the locomotive headlamp and the optical axis point of the digital camera comprises the following steps: n-x0，
Wherein x is0The horizontal coordinate of the optical axis point of the digital camera, x the horizontal coordinate of the central point of the locomotive headlamp, f the currently used focal length, and α the horizontal included angle of the central point of the locomotive headlamp relative to the optical axis point of the digital camera.
Preferably, the centering self-checking and calibrating method of the headlamp illuminance detection device comprises an angle correction method: firstly, a theodolite is used for measuring the field of view of a collimator, the collimator consists of a large-field-of-view imaging mirror and a reticle, uniformly arranged grid lines are carved on the reticle, and the theodolite is used for measuring the angles of all grid intersections and vertexes on the reticle, namely the included angles of vertical rays emitted to the central point of the reticle by the theodolite and the grid intersections and vertexes emitted to the reticle by the theodolite; after a field of view is obtained by measurement of a theodolite, the theodolite is removed, a reticle image is measured by the digital camera, pixel positions of grid intersections and vertexes of the reticle are measured, coordinates of the central positions of the grid intersections are found out by calculation, the included angles of vertical rays of the digital camera, which shoot to the central point of the reticle, of the grid intersections and vertexes of the reticle, and rays of the digital camera, which shoot to the grid intersections and vertexes of the reticle, are obtained, and the corresponding relation between the angles of the grid intersections and vertexes of the reticle, which are measured by the theodolite, and the angles of the grid intersections and vertexes of the reticle, which are measured by the digital; and finally, correcting the error of the horizontal included angle of the central point of the headlamp relative to the optical axis point of the digital camera by using the obtained corresponding relation. When a digital camera is used for shooting images, the images can be deformed at some time, so that errors exist in the detected horizontal included angle, and final centering is influenced. According to the technical scheme, the angle error is corrected, so that the obtained horizontal angle is more accurate, and the follow-up centering is more accurate.
The invention has the beneficial effects that: the digital camera is adopted to shoot the images of the locomotive headlamp, the deviation value of the central point of the detector relative to the central point of the headlamp is obtained by utilizing the image processing technology, the detector central point is automatically adjusted to the headlamp reference shaft through the device through calculation, the automatic detection and the automatic centering of the position of the detector are realized, the manual judgment and operation are not needed, the time and the labor are saved, the detection accuracy is high, and the centering is more accurate.
Drawings
FIG. 1 is a schematic diagram of a configuration of a photometric probe attitude adjustment mechanism of the present invention.
In the figure, 1 is a pitching angle adjusting mechanism, 2 is a deflection angle adjusting mechanism, 3 is a detection cylinder, and 4 is a support.
Detailed Description
The technical scheme of the invention is further specifically described by the following embodiments and the accompanying drawings.
Example (b): the centering self-checking and calibrating method of the headlamp illuminance detection device comprises the following steps:
① positioning the illuminance detection device on the locomotive track by moving the illuminance detection device to the running track of the locomotive to be tested, locking, starting the laser range finder on the illuminance detection device, measuring the distance between the target and the illuminance detection device, moving the target along the locomotive track to find the position 60 m away from the illuminance detection device and mark the position, and driving the locomotive to the mark position by the driver to stop so as to realize the horizontal positioning of the illuminance detection device and the locomotive;
and then positioning the height of a luminosity probe on the illuminance detection device: selecting the type of a locomotive to be tested in a test interface of the illuminance detection device, storing the height data of the locomotive headlamp matched with the type of the locomotive to be tested in a database, and automatically calling the height data by the illuminance detection device to drive a lifting mechanism to control a photometric probe to lift to a specified height position;
② turning on a digital camera on the illuminance detection device, shooting an image of the locomotive headlamp, and acquiring the offset position of the central point of the locomotive headlamp relative to the optical axis point of the digital camera;
③ calculating the horizontal angle and distance between the central point of the front lamp and the optical axis point of the digital camera, wherein n is x-x0，
Wherein x is0The horizontal coordinate of the optical axis point of the digital camera, x is the horizontal coordinate of the central point of the locomotive headlamp, f is the currently used focal length, and α is the horizontal included angle of the central point of the locomotive headlamp relative to the optical axis point of the digital camera;
and then, carrying out angle correction on the measured horizontal included angle, wherein the angle correction method comprises the following steps: firstly, a theodolite is used for measuring the field of view of a collimator, the collimator consists of a large-field-of-view imaging mirror and a reticle, uniformly arranged grid lines are carved on the reticle, and the theodolite is used for measuring the angles of all grid intersections and vertexes on the reticle, namely the included angles of vertical rays emitted to the central point of the reticle by the theodolite and the grid intersections and vertexes emitted to the reticle by the theodolite; after a field of view is obtained by measurement of a theodolite, the theodolite is removed, a reticle image is measured by the digital camera, pixel positions of grid intersections and vertexes of the reticle are measured, coordinates of the central positions of the grid intersections are found out by calculation, the included angles of vertical rays of the digital camera, which shoot to the central point of the reticle, of the grid intersections and vertexes of the reticle, and rays of the digital camera, which shoot to the grid intersections and vertexes of the reticle, are obtained, and the corresponding relation between the angles of the grid intersections and vertexes of the reticle, which are measured by the theodolite, and the angles of the grid intersections and vertexes of the reticle, which are measured by the digital; finally, the obtained corresponding relation is utilized to carry out error correction on the horizontal included angle of the central point of the headlamp relative to the optical axis point of the digital camera;
and then, calculating and processing the center point of the photometric probe, driving a photometric probe posture adjusting mechanism, and adjusting the pitch angle and/or the deflection angle of the photometric probe to ensure that the center point of the locomotive headlamp and the optical axis point of the digital camera coincide, namely the center point of the photometric probe is positioned on the reference axis of the locomotive headlamp, so that the photometric probe and the tested locomotive headlamp are centered.
The illuminance detection device is arranged on a test bench which can move to a locomotive track through a guide rail and comprises an illuminance probe, a digital camera arranged above the illuminance probe, an illuminance probe posture adjusting mechanism and a lifting mechanism, wherein the illuminance probe posture adjusting mechanism and the lifting mechanism are connected with the illuminance probe, as shown in figure 1, the illuminance probe posture adjusting mechanism comprises a pitching angle adjusting mechanism 1 and a deflection angle adjusting mechanism 2, the illuminance probe is arranged in a horizontally arranged detection barrel 3, the side surface of the detection barrel is connected with a rotating shaft, the rotating shaft is connected with the pitching angle adjusting mechanism 1, the pitching angle adjusting mechanism is arranged on a support 4, the rotating shaft is arranged below the support, and the rotating shaft is connected with the deflection angle adjusting mechanism 2. An upright post is arranged on the test bench frame, a lifting mechanism is arranged on the upright post, and the lifting mechanism is connected with the support. Both rotating shafts can be controlled by a motor to rotate. When the rotating shaft connected to the support rotates, the support is driven to rotate horizontally, so that the angle of the horizontal direction of the photometric probe is changed, and the deflection angle is adjusted. When the rotating shaft connected to the detecting cylinder rotates, the detecting head is driven to rotate vertically, so that the angle of the photometric probe in the vertical direction is changed, and the pitching angle adjustment is realized.
The invention adopts a digital camera to shoot the image of the locomotive headlamp, utilizes the image processing technology to obtain the deviation value of the central point of the detector relative to the central point of the headlamp, and then automatically adjusts the central point of the detector to the reference axis of the headlamp through the calculation device, thereby realizing the automatic detection and automatic centering of the position of the detector without manual judgment and operation, saving time and labor, having high detection accuracy and more accurate centering.
Claims (4)
1. A centering self-checking and calibrating method of a headlamp illuminance detection device is characterized in that the illuminance detection device comprises a luminosity probe, a digital camera arranged above the luminosity probe, a luminosity probe posture adjusting mechanism and a lifting mechanism, wherein the luminosity probe posture adjusting mechanism is connected with the luminosity probe; the method comprises the following steps:
① locating the position of the illuminance detection device on the locomotive track;
② turning on a digital camera on the illuminance detection device, shooting an image of the locomotive headlamp, and acquiring the offset position of the central point of the locomotive headlamp relative to the optical axis point of the digital camera;
③ calculating the horizontal angle and distance between the central point of the head lamp of the locomotive and the optical axis point of the digital camera, wherein the horizontal angle between the central point of the head lamp of the locomotive and the optical axis point of the digital camera is calculated by the method that n is x-x0，
Wherein x is0The horizontal coordinate of the light axis point of the digital camera, x is the horizontal coordinate of the central point of the locomotive headlamp, f is the currently used focal length, α is the horizontal included angle of the central point of the locomotive headlamp relative to the light axis point of the digital camera, the attitude adjusting mechanism of the photometric probe is driven by calculation and processing, the pitching angle and/or the deflection angle of the photometric probe are adjusted, the central point of the locomotive headlamp and the light axis point of the digital camera are coincided, namely the central point of the photometric probe is positioned on the reference axis of the locomotive headlamp, and the centering of the photometric probe and the locomotive headlamp to be tested is realized.
2. The centering self-checking and calibrating method for the headlamp illuminance detection device according to claim 1, wherein the step ① comprises turning on a laser range finder on the illuminance detection device when the illuminance detection device is on the locomotive track, measuring the distance between the target and the illuminance detection device, moving the target along the locomotive track to a position 60 meters away from the illuminance detection device and marking, and the driver drives the locomotive to the marked position to stop, thereby realizing the horizontal positioning of the illuminance detection device and the locomotive.
3. The method for centering self-checking and calibrating the headlamp illuminance detection device as claimed in claim 1 or 2, wherein the step ① comprises selecting the type of the locomotive to be tested in the test interface of the illuminance detection device, storing the height data of the headlamp of the locomotive matched with the type of the locomotive to be tested in the database, and automatically calling the height data by the illuminance detection device to drive the lifting mechanism to control the illuminance probe to lift to the specified height position.
4. The centering self-checking and calibrating method for the headlamp illuminance detection device according to claim 1, characterized by comprising an angle correction method: firstly, a theodolite is used for measuring the field of view of a collimator, the collimator consists of a large-field-of-view imaging mirror and a reticle, uniformly arranged grid lines are carved on the reticle, and the theodolite is used for measuring the angles of all grid intersections and vertexes on the reticle, namely the included angles of vertical rays emitted to the central point of the reticle by the theodolite and the grid intersections and vertexes emitted to the reticle by the theodolite; after a field of view is obtained by measurement of a theodolite, the theodolite is removed, a reticle image is measured by the digital camera, pixel positions of grid intersections and vertexes of the reticle are measured, coordinates of the central positions of the grid intersections are found out by calculation, the included angles of vertical rays of the digital camera, which shoot to the central point of the reticle, of the grid intersections and vertexes of the reticle, and rays of the digital camera, which shoot to the grid intersections and vertexes of the reticle, are obtained, and the corresponding relation between the angles of the grid intersections and vertexes of the reticle, which are measured by the theodolite, and the angles of the grid intersections and vertexes of the reticle, which are measured by the digital; and finally, correcting the error of the horizontal included angle of the central point of the headlamp relative to the optical axis point of the digital camera by using the obtained corresponding relation.
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| CN108760240B (en) * | 2018-06-27 | 2024-04-09 | 上海合参智能医疗科技有限公司 | Detection method and device for uniformity of illumination of acquisition light path of traditional Chinese medicine inspection instrument |
| CN110243468B (en) * | 2019-07-08 | 2024-05-14 | 华域视觉科技(上海)有限公司 | Simple flexible brightness imaging system |
| CN111595563A (en) * | 2020-06-10 | 2020-08-28 | 中汽院智能网联科技有限公司 | Headlamp illumination performance dynamic test method based on whole vehicle |
| CN111595562A (en) * | 2020-06-10 | 2020-08-28 | 中汽院智能网联科技有限公司 | Dynamic test system for illumination performance of vehicle headlamp |
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