CN112964675A - Device and method for measuring reflectivity of lens hood of vehicle-mounted forward-looking camera - Google Patents
Device and method for measuring reflectivity of lens hood of vehicle-mounted forward-looking camera Download PDFInfo
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- CN112964675A CN112964675A CN202110157265.2A CN202110157265A CN112964675A CN 112964675 A CN112964675 A CN 112964675A CN 202110157265 A CN202110157265 A CN 202110157265A CN 112964675 A CN112964675 A CN 112964675A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/55—Specular reflectivity
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
Abstract
The invention belongs to the field of advanced driving assistance, and particularly provides a device and a method for measuring reflectivity of a light shield of a vehicle-mounted forward-looking camera. The invention aims to solve the problem of reflectivity detection of a light shield of the existing vehicle-mounted front-view camera. The measuring device comprises an illumination module and a vehicle-mounted forward-looking camera, wherein a detector is arranged in the vehicle-mounted forward-looking camera, the illumination module comprises an installation body, the installation body is movably arranged, an illumination light source and an optical filter are arranged in the installation body, the optical filter is arranged on one side of the vehicle-mounted forward-looking camera, so that light emitted by the illumination light source is transmitted to the detector through the optical filter, a light shield is arranged on a transmission path of the light of the illumination light source, and at least part of the light can be reflected to the detector through the light shield. The structural design rationality and the processing quality of the light shield can be more comprehensively measured.
Description
Technical Field
The invention belongs to the technical field of advanced driving assistance, and particularly provides a device and a method for measuring reflectivity of a light shield of a vehicle-mounted forward-looking camera.
Background
The advanced driving assistance system comprehensively utilizes key technologies such as artificial intelligence, machine vision, sensors, global positioning and the like, so that a driver can perceive possible dangers in advance, and safe and comfortable driving behaviors are realized. The forward-looking camera of the advanced driving assistance system serves as a main sensor and provides functions of lane departure warning, automatic lane keeping assistance, high-low beam control, traffic sign recognition and the like by capturing and analyzing pictures and videos in a front-end view field range. A front-view camera of the advanced driving assistance system is generally arranged on an installation support at the rear end of a front windshield, and static or dynamic objects are detected and identified by acquiring environmental data in front of the running automobile in real time. In the actual driving process, because the internal environment and the external environment of the automobile have obvious difference, a part of light inside the automobile enters the front-view camera after being reflected by the front windshield, the imaging quality and the contrast are reduced, and the phenomenon of misjudgment of the driving road condition is caused. Based on this, many automobile manufacturers install the lens hood on the installing support, prescribe a limit to the imaging range of forward looking camera, block that the inside light of car gets into the forward looking camera, avoided the interior virtual of car of windshield to the interference effect of forward looking camera.
The automobile front-view camera lens hood generally adopts a zigzag structural design, is made of black plastic with low glossiness, can effectively eliminate stray light of an automobile external environment, shields non-imaging light of an automobile internal environment, and improves the imaging quality of a camera. However, because the light shield is installed at a certain position below the front-view camera, and the surface of the light shield and the entrance pupil of the front-view camera form a certain included angle, when external environment light still passes through the front windshield during the driving of the automobile, a small amount of light is reflected by the light shield to enter the front-view camera, and light spots are formed on the surface of the detector, thereby seriously affecting the imaging quality of the front-view camera and the normal operation of the functions of the advanced driving assistance system. This is mainly due to the fact that the structural design of the light shield is not reasonable, the processing error is large, the material does not meet the requirements, and the like. The existing quality detection method for the light shield mainly comprises the step of detecting the reflectivity of the light shield, the existing detection instrument mainly comprises a glossiness instrument, a light source with a specific angle is adopted to be incident to the smooth surface of the light shield, and the reflectivity of a material is represented by the ratio of emergent light intensity to incident light intensity. The method is limited by the detection angle and the detection area, the reflectivity of the sawtooth structure surface of the lens hood cannot be given, and the quality of the front-view camera lens hood cannot be comprehensively measured.
Accordingly, there is a need in the art for a new apparatus and method for measuring the reflectivity of a lens hood of a vehicle-mounted front-view camera to solve the problem of detecting the reflectivity of the lens hood of the existing vehicle-mounted front-view camera.
Disclosure of Invention
In order to solve the above problems in the prior art, that is, to solve the problem of detecting the reflectivity of the light shield of the existing vehicle-mounted forward-looking camera, the present invention provides a device and a method for measuring the reflectivity of the light shield of the vehicle-mounted forward-looking camera, wherein the measuring device includes an illumination module and the vehicle-mounted forward-looking camera, a detector is arranged in the vehicle-mounted forward-looking camera, the illumination module includes an installation body, the installation body is movably arranged, an illumination light source and a light filter are arranged in the installation body, the light filter is arranged on one side of the vehicle-mounted forward-looking camera, so that light emitted by the illumination light source is transmitted to the detector through the light filter, the light shield is arranged on a transmission path of the light of the illumination light source, and at least part of the light can be reflected to the detector through the light.
In the preferable technical solution of the above-mentioned apparatus for measuring the reflectivity of the light shield of the vehicle-mounted forward-looking camera, the measuring device also comprises a control module which is connected with the vehicle-mounted forward-looking camera, the control module is also connected with the illumination module, the measuring device also comprises a shading module, the illumination module and the vehicle-mounted front-view camera are arranged on the automobile, the shading module and the lighting module are arranged on the outer side of the automobile, the vehicle-mounted front-view camera is arranged on the inner side of the automobile, the light shield is positioned at the lower side of the vehicle-mounted front-view camera, the illumination module is arranged between the light shield module and the vehicle-mounted front-view camera, the light shading module covers the field range of the vehicle-mounted forward-looking camera, and light emitted by the illumination light source is transmitted to the detector after passing through the optical filter and the front windshield of the automobile.
In a preferred technical solution of the apparatus for measuring the reflectivity of the light shield of the vehicle-mounted forward-looking camera, the illumination light source is an LED light source or a combination of an LED light source and a collimating lens or a combination of an optical fiber coupling LED light source or a broadband light source and a band pass filter.
In a preferred embodiment of the apparatus for measuring the reflectance of the lens hood of the vehicle-mounted forward-looking camera, the optical filter is an absorption-type neutral density filter or a reflection-type neutral density filter; and/or the surface of the light shield is of a sawtooth structure.
In an optimal technical solution of the device for measuring the reflectivity of the light shield of the vehicle-mounted forward-looking camera, the light shield module includes an installation frame and a light shield, the light shield is connected with and covers the installation frame, and the installation frame is arranged on the front cover of the vehicle.
In an optimal technical scheme of the device for measuring the reflectivity of the light shield of the vehicle-mounted forward-looking camera, the light shield is made of light shielding fabric or a black matte self-adhesive plate.
In the preferable technical scheme of the device for measuring the reflectivity of the light shield of the vehicle-mounted forward-looking camera, the mounting frame comprises metal supports, a plurality of metal supports are fixed to form a grid shape, and vacuum adsorption discs are arranged on the metal supports and adsorbed on the front cover of the automobile.
In an optimal technical scheme of the device for measuring the reflectivity of the light shield of the vehicle-mounted forward-looking camera, the lighting module further comprises a movable support, and the movable support is connected to the mounting body and is connected with a front top beam of an automobile.
In the preferable technical scheme of the device for measuring the reflectivity of the light shield of the vehicle-mounted forward-looking camera, the movable support comprises a first supporting rod and a second supporting rod, the first supporting rod is pivotally connected with the second supporting rod, a vacuum adsorption disc is arranged on the second supporting rod, the vacuum adsorption disc is adsorbed on a front top beam of the automobile, and the first supporting rod is slidably connected with the installation body.
The invention also provides a method for measuring the reflectivity of the lens hood of the vehicle-mounted forward-looking camera, which comprises the reflectivity measuring device in any one of the technical schemes, and the measuring method comprises the following steps: controlling the illumination light source to emit an LED light source; receiving preset exposure parameter information; acquiring a reference light intensity value; acquiring a secondary image light intensity value; the reflectivity of the light shield is calculated, wherein,
r is the reflectivity of the mask, I0Is the standard light intensity value, I is the secondary image light intensity value, and lambda is the attenuation coefficient of the filter.
The technical scheme includes that the measuring device comprises an illumination module and a vehicle-mounted forward-looking camera, a detector is arranged in the vehicle-mounted forward-looking camera, the illumination module comprises an installation body, the installation body is movably arranged, an illumination light source and an optical filter are arranged in the installation body, the optical filter is arranged on one side of the vehicle-mounted forward-looking camera, so that light emitted by the illumination light source is transmitted to the detector through the optical filter, a light shield is arranged on a transmission path of the light of the illumination light source, and at least part of the light can be reflected to the detector through the light shield.
The working principle of the setting mode is as follows: the method comprises the steps of firstly forming a light source by using an illumination light source and an optical filter, imaging on the surface of a detector of the vehicle-mounted front-view camera, carrying out image analysis and data processing on the obtained image so as to obtain a reference light intensity value, removing the optical filter, moving the illumination light source so as to scan and image the illumination light source in the field range of the vehicle-mounted front-view camera so as to obtain an auxiliary image light intensity value, carrying out ratio calculation by using the auxiliary image light intensity value and the reference light intensity value, and integrating the attenuation coefficient of the optical filter so as to obtain the reflectivity of a lens hood of the vehicle-mounted front-view camera.
The detection device is suitable for reflectivity measurement of the light shield with any structure, can more comprehensively measure structural design reasonability and processing quality of the light shield, saves production cost of the light shield of the vehicle-mounted forward-looking camera in a mass production process, and improves production efficiency of a production line. In addition, the lighting module of the device for measuring the reflectivity of the lens hood of the vehicle-mounted forward-looking camera comprises few elements, has a simple structure, and is easy to mount and dismount.
Drawings
The following describes a measurement apparatus and a measurement method of a mask reflectance of a vehicle-mounted front view camera according to the present invention with reference to the accompanying drawings. In the drawings:
FIG. 1 is a schematic structural diagram of a device for measuring the reflectivity of a lens hood of a vehicle-mounted front-view camera according to the present invention, which is mounted on a vehicle;
FIG. 2 is a schematic view of a light source emitted by the device for measuring the reflectivity of the lens hood of the vehicle-mounted front-view camera according to the present invention entering the vehicle-mounted front-view camera;
FIG. 3 is an enlarged view of the structure at A in FIG. 1;
FIG. 4 is a schematic diagram illustrating steps of a method for measuring a reflectivity of a lens hood of a vehicle-mounted front-view camera according to the present invention;
fig. 5 is a schematic structural view of the light shield.
List of reference numerals:
1-a lighting module; 11-mounting the body; 12-a movable support; 121-a first strut; 122-a second strut; 2-a control module; 3-vehicle-mounted front-view camera; 4-a shading module; 41-a mounting frame; 42-a shade; 5-a light shield.
Detailed Description
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention. And can be adjusted as needed by those skilled in the art to suit particular applications. For example, although the description has been made with respect to a metal bracket, it is apparent that the present invention may take other various forms, for example, a plastic bracket, etc., as long as the stability of the light blocking module can be secured.
As shown in fig. 1, 2 and 3, in order to solve the problem of reflectivity detection of a light shield 5 of a front-view camera 3 of an existing automobile, the measuring device of the invention comprises an illumination module 1, a control module 2 and an on-vehicle front-view camera 3, wherein a detector is arranged in the on-vehicle front-view camera 3, the control module 2 is connected with the on-vehicle front-view camera 3, the control module 2 is further connected with the illumination module 1, the illumination module 1 comprises a mounting body 11, the mounting body 11 is movably arranged, and an illumination light source and a filter are arranged in the mounting body 11, wherein the illumination light source is arranged at a corresponding position in the mounting body as shown in a in fig. 3, the filter is arranged at a corresponding position in the mounting body as shown in b in fig. 3, the filter is arranged at one side of the on-vehicle front-view camera 3, so that light emitted by the illumination light source is transmitted to the detector, the light shield 5 is disposed on a propagation path of light of the illumination light source, and at least a part of the light can be reflected to the detector through the light shield 5.
As shown in fig. 4, the method for measuring the reflectivity of the light shield 5 of the vehicle-mounted front-view camera 3 of the present invention includes the following steps:
step S1: and controlling the illumination light source to emit an LED light source.
Step S2: and receiving preset exposure parameter information.
The exposure parameters of the detector need to be set to ensure the normal operation of the reflectivity measuring device, namely, the exposure parameters need to be set firstly, the optical filter has an attenuation effect on the light intensity, the optical filter needs to be removed in the subsequent steps, and the light intensity is saturated after the optical filter is removed.
Step S3: and acquiring a reference light intensity value.
The light emitted by the illumination light source reaches the surface of the detector through the filter to attenuate the light intensity, the current value of the illumination light source is reduced through the control module 2 to reduce the saturated pixel to 0, the overexposure is prevented, and the detected light intensity value is obtained and is used as a reference light intensity value.
Step S4: and acquiring the light intensity value of the secondary image.
Firstly, the optical filter needs to be detached from the mounting body 11, then the lighting module 1 is moved to move within the field of view of the vehicle-mounted forward-looking camera 3, for example, from top to bottom, so that part of the light source is reflected to the detector in the camera through the light shield 5, at this time, a main image located at the center of the field of view and an auxiliary image deviated from the center of the field of view by a certain distance are formed on the surface of the detector, and at this time, the detected auxiliary image is captured to obtain the light intensity value of the auxiliary image.
Step S5: the reflectivity of the light shield 5 is calculated.
The reflectivity of the light shield 5 of the vehicle-mounted forward looking camera 3 is calculated by the acquired reference light intensity value and the auxiliary image light intensity value and combining the attenuation coefficient of the optical filter,
r is the reflectivity of the light shield 5, I0Is the standard light intensity value, I is the secondary image light intensity value, and lambda is the attenuation coefficient of the filter.
The control module 2 is connected with the vehicle-mounted front-view camera 3 for acquiring images scanned by the vehicle-mounted front-view camera 3 so as to observe images formed on the surface of the detector, thereby forming better control over the movement of the illumination module 1 and acquiring light intensity values through the acquired images, wherein the control module 2 is composed of a driving unit, a control unit, a plurality of input and output communication interfaces and the like.
The setting mode has the advantages that: the invention can realize the comprehensive measurement of the quality of the light shield 5, is suitable for the reflectivity measurement of the light shield 5 with any structure, can more comprehensively measure the structural design rationality and the processing quality of the light shield 5, saves the production cost of the light shield 5 of the vehicle-mounted front-view camera 3 in the mass production process, and improves the production efficiency of a production line. In addition, the lighting module 1 of the reflectivity measuring device of the light shield 5 of the vehicle-mounted forward-looking camera 3 comprises few elements, is simple in structure and easy to install and disassemble, in addition, images are directly formed in the camera, the imaging quality can be ensured, the measuring accuracy is further ensured, the reflectivity of the light shield 5 can be measured by utilizing the existing vehicle-mounted forward-looking camera 3 of an automobile, the reflectivity of the light shield 5 can be accurately measured, and meanwhile, the use cost of the reflectivity measuring device can be reduced.
In a preferred embodiment, the filter is an absorption neutral density filter or a reflection neutral density filter, which can achieve effective light intensity attenuation, for example, by attenuating the light intensity with an absorption neutral density filter, the attenuation coefficient of the filter can be up to 10-4The measurement accuracy of the reflectance of the light shield 5 is improved.
With continued reference to fig. 1 and 2, as a preferred embodiment, the measuring device further includes a light shielding module 4, the illumination module 1 and the vehicle-mounted forward-looking camera 3 are disposed on the vehicle, and the light shielding module 4 and the illumination module 1 are disposed on the outer side of the vehicle, the vehicle-mounted forward-looking camera 3 is disposed on the inner side of the vehicle, the light shielding cover 5 is located on the lower side of the vehicle-mounted forward-looking camera 3, the illumination module 1 is disposed between the light shielding module 4 and the vehicle-mounted forward-looking camera 3, the light shielding module 4 covers the field range of view of the vehicle-mounted forward-looking camera 3, and light emitted by the illumination light source is transmitted to the detector through the. The vehicle-mounted front-view camera 3 and the light shield 5 can be mounted through the mounting support and are located at a certain position of the front windshield, and after light passes through the front windshield, part of the light is reflected by the light shield 5 and then enters the detector of the vehicle-mounted front-view camera 3.
Through the setting of light shielding module 4, can effectually shelter from ambient light and stray light entering on-vehicle foresight camera 3, and then reduce the measuring error of the reflectivity of lens hood 5. In addition, the reflectivity measuring device of the light shield 5 of the vehicle-mounted forward-looking camera 3 of the invention is installed on the vehicle, is built by using the existing platform of the vehicle, does not need to adjust the installation position by using the original installation positions of the light shield 5 and the vehicle-mounted forward-looking camera 3, does not need to ensure higher installation precision of the lighting module 1 and the light shield module 4, can carry out measurement and adjustment only by moving the lighting source in the field range of the vehicle-mounted forward-looking camera 3, in addition, obtains images by using the existing vehicle-mounted forward-looking camera 3 of the vehicle, reduces the production cost of the measuring device, can also carry out quality detection on the installed light shield 5, does not need to dismount the light shield, and is simple and convenient in installation and measurement operation.
With continued reference to fig. 1, as a preferred embodiment, the light shielding module 4 includes a mounting frame 41 and a light shielding member 42, the light shielding member 42 is connected to and covers the mounting frame 41, and the mounting frame 41 is provided on a front cover of the automobile. Further, the shading member 42 is a shading fabric or a black wool-surface self-adhesive board, wherein the shading fabric may be a vertical shading curtain, and of course, may also be a black paperboard, which can effectively shade light; the installation frame 41 includes metal support, and fixed formation is latticed between a plurality of metal support, is equipped with the vacuum adsorption dish on the metal support, and the vacuum adsorption dish adsorbs on the car protecgulum, and latticed metal support can form stable structure to maintain its self stability, in addition, through the setting of vacuum adsorption dish, can realize installing fast and dismantling on the car protecgulum, can install on any motor vehicle platform, simple structure, easy to operate.
In a preferred embodiment, the illumination light source is an LED light source or an assembly of an LED light source and a collimating lens or an optical fiber coupled LED light source or an assembly of a broadband light source and a band pass filter.
With continued reference to fig. 3, as a preferred embodiment, the lighting module 1 further comprises a movable bracket 12, the movable bracket 12 being connected to the mounting body 11 and to the front roof rail of the car. In one possible embodiment, the mounting body 11 comprises a mechanical mounting base and a threaded lens sleeve, the mechanical mounting base is connected with the threaded lens sleeve, the optical filter is mounted on the mechanical mounting base, the illumination source is mounted in the threaded lens sleeve, and the movable support 12 is connected to the mechanical mounting base, wherein the mechanical mounting base can be matched with threaded lens sleeves of different specifications, and it will be understood by those skilled in the art that the mechanical mounting base is annular so that light can pass through the mechanical mounting base.
Through the arrangement of the movable support 12, the illumination light source can move in the field of view of the vehicle-mounted forward-looking camera 3, so as to achieve the purpose of obtaining the secondary image, specifically, the movable support 12 can comprise a first support rod 121 and a second support rod 122, the first support rod 121 is pivotally connected with the second support rod 122, the second support rod 122 is provided with a vacuum adsorption disc, the vacuum adsorption disc is adsorbed on the front top beam of the automobile so as to be convenient to disassemble, the first support rod 121 is slidably connected with the mounting body 11, wherein the first supporting rod 121 can rotate universally relative to the second supporting rod 122 to move the installation body 11 rapidly, then, through the sliding connection between the first supporting rod 121 and the installation body 11, the precise position adjustment of the installation body 11 is performed, so that the illumination source forms a secondary image on the detector surface by reflection from the light shield 5, wherein the sliding guide can be constructed from metal.
As shown in fig. 5, the surface of the light shield 5 is a saw-toothed structure as a preferred embodiment, but the detection device of the light shield 5 of the present invention is not limited to the structure for detecting a saw-toothed structure, and may be any other shape for detection.
In summary, the advantages of the device and method for measuring the reflectivity of the light shield 5 of the vehicle-mounted forward-looking camera 3 of the present invention include: firstly, simple structure, easy to operate. The reflectivity measuring device of the light shield 5 of the vehicle-mounted forward-looking camera 3 has the advantages that the number of the elements contained in the lighting module 1 is small, the structure is simple, and the elements are easy to mount and dismount; the light shading module 4 has low assembly requirements, can be installed on any motor vehicle platform, and has the advantages of simple operation process of the control module 2, simple integral structure of the measuring device and easy operation. Secondly, the measurement error is small, and the measurement accuracy is high. According to the reflectivity measuring device of the light shield 5 of the vehicle-mounted forward-looking camera 3, the light shield 42 is mounted on the mounting frame 41, so that ambient light and stray light can be effectively shielded from entering the vehicle-mounted forward-looking camera 3, and the reflectivity measuring error of the light shield 5 is reduced. The measuring method adopts the absorption type optical filter to attenuate the light intensity, and takes the attenuated light intensity as a reference light intensity value, wherein the attenuation coefficient of the optical filter can beTo reach 10-4The measurement accuracy of the reflectivity is improved. Thirdly, the overall quality of the light shield 5 is fully measured. The reflectivity measuring device and the reflectivity measuring method of the light shield 5 of the vehicle-mounted forward-looking camera 3 are suitable for reflectivity measurement of the light shield 5 with any structure, and the structural design rationality and the processing quality of the light shield 5 can be more comprehensively measured. In the mass production process, the production cost of the camera lens hood 5 is saved, and the production efficiency of the production line is improved.
It should be noted that the above-mentioned embodiments are only used for illustrating the principle of the present invention, and are not intended to limit the protection scope of the present invention, and those skilled in the art can modify the above-mentioned structure so that the present invention can be applied to more specific application scenarios without departing from the principle of the present invention.
For example, in an alternative embodiment, the mounting module may be disposed not on the vehicle, but on the front end of the vehicle, as long as the market for the in-vehicle front-view camera 3 can be covered, without departing from the principle of the present invention, and therefore, will fall within the scope of the present invention.
For example, in another alternative embodiment, the metal bracket may be replaced with a plastic bracket or the like as long as the light shielding module 4 can maintain the installation stability, which does not depart from the principle of the present invention and thus will fall within the scope of the present invention.
For example, in another alternative embodiment, the movable bracket 12 may be attached to the front windshield of an automobile, etc., as long as the mounting stability thereof is maintained, without departing from the principle of the present invention, and thus, will fall within the scope of the present invention.
For example, in another alternative embodiment, the vehicle-mounted front-view camera 3 may be disposed not on the inner side of the automobile, but on the outer side of the automobile, as long as it can receive the light emitted from the lighting module 1, without departing from the principle of the present invention, and therefore, it would fall within the protection scope of the present invention.
For example, in another alternative embodiment, the connection form of the mounting body 11 and the first supporting rod 121 can be a fixed connection, which does not depart from the principle of the present invention, and therefore, all of them will fall into the protection scope of the present invention.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.
Claims (10)
1. The utility model provides a measuring device of lens hood reflectivity of on-vehicle foresight camera, a serial communication port, measuring device include lighting module with on-vehicle foresight camera, be equipped with the detector in the on-vehicle foresight camera, lighting module is including the installation body, the portable setting of installation body, this internal illuminating light source and the light filter of being equipped with of installation, the light filter is located one side of on-vehicle foresight camera, so that the light that illuminating light source sent propagates extremely the light filter on the detector, the lens hood is located on the propagation path of illuminating light source's light, and at least partial light can warp the lens hood reflection extremely on the detector.
2. The apparatus according to claim 1, further comprising a control module connected to the on-board forward-looking camera, the control module being further connected to the illumination module, the measurement apparatus further comprising a light-shielding module, the illumination module and the on-board forward-looking camera being disposed on a vehicle, the light-shielding module and the illumination module being disposed on an outer side of the vehicle, the on-board forward-looking camera being disposed on an inner side of the vehicle, the light-shielding cover being disposed on a lower side of the on-board forward-looking camera, the illumination module being disposed between the light-shielding module and the on-board forward-looking camera, the light-shielding module covering a field of view of the on-board forward-looking camera, light emitted from the illumination light source passing through the optical filter, and the light-shielding module, And the front windshield of the automobile is transmitted to the detector.
3. The apparatus of claim 1, wherein the illumination source is an LED light source or a combination of an LED light source and a collimating lens or a combination of an optical fiber coupled LED light source or a broadband light source and a bandpass filter.
4. The apparatus for measuring the reflectance of a lens hood of a vehicle-mounted forward-looking camera according to claim 1, wherein the filter is an absorption-type neutral density filter or a reflection-type neutral density filter; and/or the like and/or,
the surface of the light shield is of a sawtooth structure.
5. The apparatus for measuring a mask reflectivity of a vehicle-mounted forward-looking camera according to claim 2, wherein the light-shielding module includes a mounting frame and a light-shielding member, the light-shielding member is connected to and covers the mounting frame, and the mounting frame is provided on a front cover of the vehicle.
6. The apparatus according to claim 5, wherein the shade is a shade fabric or a black matte self-adhesive sheet.
7. The apparatus according to claim 5, wherein the mounting frame includes a plurality of metal frames fixed to each other to form a lattice shape, and a vacuum suction plate is attached to the metal frames and is attached to the front cover of the vehicle.
8. The apparatus of claim 1, wherein the illumination module further comprises a movable bracket connected to the mounting body and to a front cross member of the vehicle.
9. The apparatus according to claim 8, wherein the movable bracket includes a first rod and a second rod, the first rod and the second rod are pivotally connected, a vacuum chuck is disposed on the second rod, the vacuum chuck is attached to a front top beam of the vehicle, and the first rod is slidably connected to the mounting body.
10. A method of measuring a reflectance of a light shield of an in-vehicle front-view camera, comprising a reflectance measuring device according to any one of claims 1 to 9, the method comprising:
controlling the illumination light source to emit an LED light source;
receiving preset exposure parameter information;
acquiring a reference light intensity value;
acquiring a secondary image light intensity value;
the reflectivity of the light shield is calculated, wherein,
r is the reflectivity of the light shield,
I0is the standard light intensity value, I is the secondary image light intensity value, and lambda is the attenuation coefficient of the filter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110157265.2A CN112964675A (en) | 2021-02-04 | 2021-02-04 | Device and method for measuring reflectivity of lens hood of vehicle-mounted forward-looking camera |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110157265.2A CN112964675A (en) | 2021-02-04 | 2021-02-04 | Device and method for measuring reflectivity of lens hood of vehicle-mounted forward-looking camera |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112964675A true CN112964675A (en) | 2021-06-15 |
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ID=76274023
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110157265.2A Pending CN112964675A (en) | 2021-02-04 | 2021-02-04 | Device and method for measuring reflectivity of lens hood of vehicle-mounted forward-looking camera |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112964675A (en) |
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2021
- 2021-02-04 CN CN202110157265.2A patent/CN112964675A/en active Pending
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