Measuring device and measuring method for reflectivity of visor of front-view camera of vehicle

Abstract

The application belongs to the field of advanced driving assistance, and specifically provides a measuring device and a measuring method for reflectivity of a sunshade of a vehicle-mounted forward-looking camera. The application aims to solve the problem of reflectivity detection of the sunshade of the existing vehicle-mounted forward-looking camera. For this purpose, the measuring device of the application comprises an illumination module and a vehicle-mounted forward-looking camera, the vehicle-mounted forward-looking camera is provided with a detector, the illumination module comprises a mounting body, the mounting body is movably arranged, the mounting body is provided with an illumination light source and a filter, the filter is arranged on one side of the vehicle-mounted forward-looking camera, so that the light emitted by the illumination light source is transmitted to the detector through the filter, the sunshade is arranged on the 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 sunshade. The structural design rationality and the processing quality of the sunshade can be more comprehensively measured.

Description

Technical Field

[0001] This invention belongs to the field of advanced driver assistance technology, specifically providing a device and method for measuring the reflectivity of the sunshade of a vehicle-mounted forward-looking camera. Background Technology

[0002] Advanced driver assistance systems (ADAS) integrate key technologies such as artificial intelligence, machine vision, sensors, and GPS to enable drivers to anticipate potential hazards and achieve safer and more comfortable driving. The forward-facing camera in an ADAS serves as the primary sensor, capturing and analyzing images and video within its field of view to provide functions such as lane departure warning, automatic lane keeping assist, high / low beam control, and traffic sign recognition. ADAS forward-facing cameras are typically mounted on a bracket at the rear of the windshield, collecting real-time environmental data ahead of the vehicle to detect and identify static and dynamic objects. In actual driving, due to the significant differences between the internal and external environments of the vehicle, some light from inside the car is reflected by the windshield and enters the forward-facing camera, reducing image quality and contrast and causing misjudgments of road conditions. Therefore, many car manufacturers install sunshades on the mounting bracket to limit the imaging range of the forward-facing camera, blocking light from inside the car and preventing interference from the windshield's internal image.

[0003] Automotive forward-view camera sunshades typically employ a serrated design and are made of low-gloss black plastic. This effectively eliminates stray light from the external environment and blocks non-image-forming light from the interior, improving the camera's image quality. However, because the sunshade is positioned below the forward-view camera, its surface forms an angle with the camera's entrance pupil. During driving, some ambient light still reflects off the windshield and into the forward-view camera, creating light spots on the detector surface. This severely impacts the image quality and the normal operation of advanced driver assistance systems (ADAS). This is mainly due to unreasonable structural design, large manufacturing errors, and substandard materials. Current methods for quality inspection of sunshades primarily involve reflectivity testing. The main testing instrument is a gloss meter, which uses a light source at a specific angle to illuminate the smooth surface of the sunshade and characterizes the material's reflectivity using the ratio of outgoing to incident light intensity. This method is limited by the detection angle and detection area, and cannot provide the reflectivity of the sawtooth structure surface of the light shield, thus failing to comprehensively measure the quality of the front-view camera's light shield.

[0004] Accordingly, there is a need in the art for a new device and method for measuring the reflectivity of the sunshade of a vehicle-mounted forward-looking camera to solve the problem of detecting the reflectivity of the sunshade of existing vehicle-mounted forward-looking cameras. Summary of the Invention

[0005] To address the aforementioned problems in the prior art, specifically the issue of detecting the reflectivity of the sunshade of an existing vehicle-mounted forward-looking camera, this invention provides a measuring device and method for measuring the reflectivity of the sunshade of a vehicle-mounted forward-looking camera. The measuring device includes an illumination module and the vehicle-mounted forward-looking camera. The vehicle-mounted forward-looking camera contains a detector. The illumination module includes a mounting body, which is movably disposed. The mounting body contains an illumination source and a filter. The filter is disposed on one side of the vehicle-mounted forward-looking camera so that the light emitted by the illumination source propagates through the filter to the detector. The sunshade is disposed in the propagation path of the light from the illumination source, and at least a portion of the light can be reflected by the sunshade to the detector.

[0006] In the preferred embodiment of the above-mentioned device for measuring the reflectivity of the hood of a vehicle-mounted forward-looking camera, the measuring device further includes a control module connected to the vehicle-mounted forward-looking camera and also connected to the lighting module. The measuring device also includes a hood module. The hood module, the lighting module, and the vehicle-mounted forward-looking camera are mounted on a vehicle, with the hood module and the lighting module located on the outside of the vehicle and the vehicle-mounted forward-looking camera located on the inside of the vehicle. The hood is located below the vehicle-mounted forward-looking camera, and the lighting module is located between the hood module and the vehicle-mounted forward-looking camera. The hood module covers the field of view of the vehicle-mounted forward-looking camera. The light emitted by the lighting source passes through the filter and the windshield of the vehicle before propagating to the detector.

[0007] In the preferred embodiment of the above-mentioned device for measuring the reflectivity of the hood of the vehicle-mounted forward-looking camera, the illumination source is an LED light source, or a combination of an LED light source and a collimating lens, or a fiber-coupled LED light source, or a combination of a broadband light source and a bandpass filter.

[0008] In the preferred embodiment of the above-mentioned device for measuring the reflectivity of the light shield of the vehicle-mounted forward-looking camera, the filter is an absorptive neutral density filter or a reflective neutral density filter; and / or, the surface of the light shield has a serrated structure.

[0009] In the preferred embodiment of the above-mentioned device for measuring the reflectivity of the hood of a vehicle-mounted forward-looking camera, the hood module includes a mounting frame and a hood component, the hood component being connected to and covering the mounting frame, and the mounting frame being disposed on the hood of the vehicle.

[0010] In the preferred embodiment of the above-mentioned device for measuring the reflectivity of the light shield of the vehicle-mounted forward-looking camera, the light shield is a light-shielding fabric or a black fuzzy self-adhesive board.

[0011] In the preferred embodiment of the above-mentioned device for measuring the reflectivity of the sunshade of the vehicle-mounted forward-looking camera, the mounting frame includes a metal bracket, and a plurality of the metal brackets are fixed together to form a grid. A vacuum adsorption disk is provided on the metal bracket, and the vacuum adsorption disk is adsorbed onto the front cover of the car.

[0012] In the preferred embodiment of the above-mentioned device for measuring the reflectivity of the hood of the vehicle-mounted forward-view camera, the lighting module further includes a movable bracket, which is connected to the mounting body and to the front roof beam of the vehicle.

[0013] In the preferred embodiment of the above-mentioned device for measuring the reflectivity of the sunshade of the vehicle-mounted forward-looking camera, the movable bracket includes a first support rod and a second support rod, the first support rod and the second support rod are pivotally connected, the second support rod is provided with a vacuum adsorption plate, the vacuum adsorption plate is adsorbed onto the front roof crossbeam of the vehicle, and the first support rod is slidably connected to the mounting body.

[0014] This invention also provides a method for measuring the reflectivity of a lens hood for a vehicle-mounted forward-looking camera, including the reflectivity measuring device described in any of the above technical solutions. The measurement method includes: controlling the illumination source to emit an LED light source; receiving preset exposure parameter information; obtaining a reference light intensity value; obtaining a secondary image light intensity value; and calculating the reflectivity of the lens hood, wherein... R is the reflectivity of the light shield, I0 is the reference light intensity, I is the secondary image light intensity, and λ is the attenuation coefficient of the filter.

[0015] Those skilled in the art will understand that, in the technical solution of the present invention, the measuring device includes an illumination module and a vehicle-mounted forward-looking camera. The vehicle-mounted forward-looking camera is equipped with a detector. The illumination module includes a mounting body, which is movably disposed. The mounting body is equipped with an illumination source and a filter. The filter is disposed on one side of the vehicle-mounted forward-looking camera so that the light emitted by the illumination source is transmitted to the detector through the filter. A light shield is disposed in the propagation path of the light from the illumination source, and at least part of the light can be reflected to the detector through the light shield.

[0016] The working principle of the above setup is as follows: First, a light source is formed using an illumination source and a filter, which images onto the detector surface of the vehicle-mounted forward-looking camera. The acquired image is then analyzed and processed to obtain a reference light intensity value. After removing the filter, the illumination source is moved to scan and image within the field of view of the vehicle-mounted forward-looking camera, thereby obtaining the secondary image light intensity value. The ratio between the secondary image light intensity value and the reference light intensity value is calculated, and the attenuation coefficient of the filter is taken into account to obtain the reflectivity of the vehicle-mounted forward-looking camera's hood.

[0017] The above-described configuration allows for a quantitative description of the reflectivity of the lens hood of a vehicle-mounted forward-looking camera, enabling a comprehensive assessment of the lens hood's quality. The detection device of this invention is applicable to the reflectivity measurement of lens hoods of any structure, providing a more comprehensive evaluation of the structural design rationality and manufacturing quality. In mass production, this reduces the production cost of vehicle-mounted forward-looking camera lens hoods and improves production line efficiency. Furthermore, the illumination module of the vehicle-mounted forward-looking camera lens hood reflectivity measurement device of this invention contains few components, has a simple structure, and its components are easy to install and remove. Attached Figure Description

[0018] The apparatus and method for measuring the reflectivity of the sunshade of the vehicle-mounted forward-looking camera of the present invention will now be described with reference to the accompanying drawings. In the drawings:

[0019] Figure 1 This is a schematic diagram of the structure of the device for measuring the reflectivity of the sunshade of the vehicle-mounted forward-looking camera of the present invention, installed on a car.

[0020] Figure 2 This is a schematic diagram showing the light source emitted by the device for measuring the reflectivity of the hood of the vehicle-mounted forward-looking camera of the present invention entering the vehicle-mounted forward-looking camera.

[0021] Figure 3 for Figure 1 Enlarged view of the structure at point A;

[0022] Figure 4 This is a schematic diagram illustrating the steps of the method for measuring the reflectivity of the sunshade of the vehicle-mounted forward-looking camera according to the present invention.

[0023] Figure 5 This is a schematic diagram of the structure of the light shield.

[0024] List of reference numerals:

[0025] 1-Lighting module; 11-Mounting body; 12-Movable bracket; 121-First support rod; 122-Second support rod; 2-Control module; 3-Vehicle front-view camera; 4-Light shielding module; 41-Mounting frame; 42-Light shielding component; 5-Light shield. Detailed Implementation

[0026] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the invention and are not intended to limit the scope of protection of the invention. Those skilled in the art can make adjustments as needed to adapt to specific applications. For example, although the specification describes it as a metal bracket, the present invention can obviously take various other forms, such as a plastic bracket, as long as the stability of the light-shielding module can be ensured.

[0027] like Figure 1 , Figure 2 and Figure 3 As shown, to solve the problem of reflectivity detection of the light shield 5 of the existing automotive front-view camera 3, the measuring device of the present invention includes an illumination module 1, a control module 2, and an onboard front-view camera 3. The onboard front-view camera 3 contains a detector. The control module 2 is connected to the onboard front-view camera 3 and is also connected to the illumination module 1. The illumination module 1 includes a mounting body 11, which is movably configured. The mounting body 11 contains an illumination source and a filter. The position of the illumination source is set as follows: Figure 3 The filter is positioned at the corresponding location within the mounting body shown in Figure a, as indicated by the image. Figure 3 At the corresponding position inside the mounting body shown in Figure b, a filter is disposed on one side of the vehicle-mounted forward-looking camera 3 so that the light emitted by the illumination source is transmitted to the detector (not shown in the figure) through the filter. The light shield 5 is disposed on the propagation path of the light from the illumination source, and at least part of the light can be reflected to the detector through the light shield 5.

[0028] like Figure 4 As shown, the method for measuring the reflectivity of the light shield 5 of the vehicle-mounted forward-looking camera 3 of the present invention includes the following steps:

[0029] Step S1: Control the lighting source to emit LED light.

[0030] Step S2: Receive preset exposure parameter information.

[0031] First, the exposure parameters need to be set. Since the filter has an attenuation effect on light intensity, and the filter needs to be removed in subsequent steps, the light intensity will reach saturation after the filter is removed. Therefore, the exposure parameters of the detector must be set to ensure the normal operation of the reflectivity measurement device.

[0032] Step S3: Obtain the reference light intensity value.

[0033] The light emitted by the illumination source passes through a filter to reach the detector surface to attenuate the light intensity. The control module 2 reduces the current value of the illumination source to reduce the saturation pixel to 0 to prevent overexposure, thereby obtaining the detected light intensity value and using it as the reference light intensity value.

[0034] Step S4: Obtain the light intensity value of the secondary image.

[0035] First, the filter needs to be removed from the mounting body 11. Then, the lighting module 1 is moved so that it moves within the field of view of the vehicle-mounted front-view camera 3, for example, from top to bottom, so that part of the light source is reflected by the light shield 5 onto the detector inside the camera. At this time, a main image located at the center of the field of view and a secondary image located at a certain position off the center of the field of view will be formed on the surface of the detector. At this time, the detected secondary image is captured to obtain the light intensity value of the secondary image.

[0036] Step S5: Calculate the reflectivity of the light shield 5.

[0037] The reflectivity of the light shield 5 of the vehicle-mounted forward-looking camera 3 is calculated by using the obtained reference light intensity value and secondary image light intensity value, combined with the attenuation coefficient of the filter. R is the reflectivity of the light shield 5, I0 is the reference light intensity value, I is the secondary image light intensity value, and λ is the attenuation coefficient of the filter.

[0038] The purpose of connecting the control module 2 to the vehicle-mounted forward-view camera 3 is to acquire images scanned by the vehicle-mounted forward-view camera 3 so as to observe the image formed on the detector surface, thereby better controlling the movement of the lighting module 1 and obtaining the light intensity value through the acquired image. The control module 2 consists of a drive unit, a control unit, and multiple input / output communication interfaces.

[0039] The advantages of the above-described configuration are as follows: This invention can comprehensively measure the quality of the light shield 5, is applicable to the reflectivity measurement of light shield 5 with any structure, and can more comprehensively measure the structural design rationality and processing quality of the light shield 5. In mass production, it saves on the production cost of the light shield 5 for the vehicle-mounted front-view camera 3 and improves the production efficiency of the production line. Furthermore, the illumination module 1 of the reflectivity measurement device for the light shield 5 of the vehicle-mounted front-view camera 3 of this invention contains fewer components, has a simple structure, and the components are easy to install and disassemble. In addition, direct imaging within the camera ensures image quality, thereby guaranteeing measurement accuracy. It can utilize existing vehicle-mounted front-view cameras 3 for reflectivity measurement of the light shield 5, accurately measuring the reflectivity of the light shield 5 while reducing the cost of using the reflectivity measurement device.

[0040] In a preferred embodiment, the filter is an absorptive neutral density filter or a reflective neutral density filter, which can achieve effective light intensity attenuation. For example, by using an absorptive neutral density filter to attenuate light intensity, the attenuation coefficient of the filter can reach 10. -4 This improves the measurement accuracy of the reflectivity of the light shield 5.

[0041] Continue to refer to Figure 1 and Figure 2In a preferred embodiment, the measuring device further includes a light-shielding module 4. The light-shielding module 4, the lighting module 1, and the vehicle-mounted front-view camera 3 are mounted on the vehicle, with the light-shielding module 4 and the lighting module 1 located on the outer side of the vehicle, and the vehicle-mounted front-view camera 3 located on the inner side of the vehicle. A light shield 5 is located below the vehicle-mounted front-view camera 3, and the lighting module 1 is located between the light-shielding module 4 and the vehicle-mounted front-view camera 3. The light-shielding module 4 covers the field of view of the vehicle-mounted front-view camera 3. The light emitted by the lighting source passes through a filter and the windshield of the vehicle before reaching the detector. The vehicle-mounted front-view camera 3 and the light shield 5 can be mounted using a mounting bracket and are located at a certain position on the windshield. After the light passes through the windshield, some of the light is reflected by the light shield 5 before entering the detector of the vehicle-mounted front-view camera 3.

[0042] By setting the light-shielding module 4, ambient light and stray light can be effectively blocked from entering the vehicle-mounted front-view camera 3, thereby reducing the measurement error of the reflectivity of the light-shielding cover 5. Furthermore, the reflectivity measuring device for the light-shielding cover 5 of the vehicle-mounted front-view camera 3 of this invention is installed on the vehicle, utilizing the existing vehicle platform. Using the existing mounting positions of the light-shielding cover 5 and the vehicle-mounted front-view camera 3, there is no need to adjust their installation positions. The lighting module 1 and the light-shielding module 4 do not need to guarantee high installation accuracy; measurement and adjustment can be performed simply by moving the lighting source within the field of view of the vehicle-mounted front-view camera 3. In addition, using the existing vehicle-mounted front-view camera 3 for image acquisition reduces the production cost of the measuring device and allows for quality inspection of the already installed light-shielding cover 5 without removal, making installation and measurement operations simple and convenient.

[0043] Continue to refer to Figure 1 In a preferred embodiment, the light-shielding module 4 includes a mounting frame 41 and a light-shielding element 42. The light-shielding element 42 connects to and covers the mounting frame 41, which is mounted on the hood of the vehicle. Further, the light-shielding element 42 is a light-shielding fabric or a black felt self-adhesive panel. The light-shielding fabric can be a vertical light-shielding curtain or black cardboard, providing effective light blocking. The mounting frame 41 includes metal brackets, with several metal brackets fixed together to form a grid. Vacuum suction trays are provided on the metal brackets, adhering to the hood of the vehicle. The grid-like metal brackets form a stable structure to maintain their stability. Furthermore, the vacuum suction trays allow for quick installation and removal from the hood, enabling installation on any vehicle platform. The structure is simple and easy to operate.

[0044] In a preferred embodiment, the lighting source is an LED light source, or a combination of an LED light source and a collimating lens, or a fiber-coupled LED light source, or a combination of a broadband light source and a bandpass filter.

[0045] Continue to refer to Figure 3 In a preferred embodiment, the lighting module 1 further includes a movable bracket 12, which is connected to the mounting body 11 and to the front roof crossbeam of the vehicle. In one possible embodiment, the mounting body 11 includes a mechanical mounting base and a threaded lens sleeve. The mechanical mounting base is connected to the threaded lens sleeve, a filter is mounted on the mechanical mounting base, and the lighting source is mounted inside the threaded lens sleeve. The movable bracket 12 is connected to the mechanical mounting base. The mechanical mounting base can be matched with threaded lens sleeves of different sizes. Those skilled in the art will understand that the mechanical mounting base is annular to allow light to pass through it.

[0046] By setting up the movable bracket 12, the illumination source can be moved within the field of view of the vehicle-mounted front-view camera 3 to achieve the purpose of acquiring a secondary image. Specifically, the movable bracket 12 may include a first support rod 121 and a second support rod 122. The first support rod 121 and the second support rod 122 are pivotally connected. The second support rod 122 is provided with a vacuum adsorption plate, which is adsorbed onto the front roof crossbeam of the car for easy disassembly. The first support rod 121 is slidably connected to the mounting body 11. The first support rod 121 can rotate omnidirectionally relative to the second support rod 122 to move the mounting body 11 quickly. Then, through the sliding connection between the first support rod 121 and the mounting body 11, the precise position adjustment of the mounting body 11 is performed, so that the illumination source forms a secondary image on the detector surface after being reflected by the light shield 5. The sliding guide rail may be constructed of metal.

[0047] like Figure 5 As shown, in a preferred embodiment, the surface of the light shield 5 has a serrated structure. Of course, the light shield 5 detection device of the present invention is not limited to detecting serrated structures; any other shape can be detected.

[0048] In summary, the advantages of the reflectivity measuring device and method for the light shield 5 of the vehicle-mounted forward-looking camera 3 of the present invention include: First, simple structure and easy operation. The illumination module 1 of the reflectivity measuring device for the light shield 5 of the vehicle-mounted forward-looking camera 3 of the present invention contains few components, has a simple structure, and the components are easy to install and disassemble; the assembly requirements of the light shield module 4 are low, and it can be installed on any vehicle platform; the operation process of the control module 2 is simple, and the overall structure of the measuring device is simple and easy to operate. Second, small measurement error and high measurement accuracy. The reflectivity measuring device for the light shield 5 of the vehicle-mounted forward-looking camera 3 of the present invention has a light shield 42 installed on the mounting frame 41, which can effectively block ambient light and stray light from entering the vehicle-mounted forward-looking camera 3, reducing the measurement error of the reflectivity of the light shield 5. The measurement method of the present invention uses an absorptive filter to attenuate the light intensity and uses the attenuated light intensity as the reference light intensity value, wherein the attenuation coefficient of the filter can reach 10. -4This invention improves the accuracy of reflectivity measurement. Thirdly, it enables a comprehensive assessment of the quality of the light shield 5. The reflectivity measurement device and method for the light shield 5 of the vehicle-mounted forward-looking camera 3 are applicable to the reflectivity measurement of light shields 5 with any structure, allowing for a more comprehensive evaluation of the structural design rationality and manufacturing quality of the light shield 5. In mass production, it saves on the production cost of the camera light shield 5 and improves the production line efficiency.

[0049] It should be noted that the above embodiments are merely used to illustrate the principles of the present invention and are not intended to limit the scope of protection of the present invention. Without departing from the principles of the present invention, those skilled in the art can adjust the above structure so that the present invention can be applied to more specific application scenarios.

[0050] For example, in an alternative implementation, the mounting module may not be installed on the vehicle, but at the front of the vehicle, as long as it can cover the market range of the vehicle-mounted front-view camera 3. These do not deviate from the principle of the present invention, and therefore all fall within the protection scope of the present invention.

[0051] For example, in another alternative embodiment, the metal bracket can be replaced with a plastic bracket, etc., as long as the light-shielding module 4 can maintain installation stability. These do not deviate from the principle of the present invention and therefore all fall within the protection scope of the present invention.

[0052] For example, in another alternative embodiment, the movable bracket 12 can be connected to the windshield of a car, as long as its installation stability can be maintained. These do not deviate from the principle of the present invention and therefore fall within the protection scope of the present invention.

[0053] For example, in another alternative embodiment, the vehicle-mounted forward-view camera 3 may not be located inside the vehicle, but may be located outside the vehicle, as long as it can receive the light emitted by the lighting module 1. These do not deviate from the principle of the present invention, and therefore all fall within the protection scope of the present invention.

[0054] For example, in another alternative embodiment, the connection between the mounting body 11 and the first support rod 121 can be a fixed connection. These do not deviate from the principle of the present invention and therefore fall within the protection scope of the present invention.

[0055] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will all fall within the scope of protection of the present invention.

Claims

1. A device for measuring the reflectivity of a light shield for a vehicle-mounted forward-looking camera, characterized in that, The measuring device includes an illumination module and the vehicle-mounted forward-facing camera. The vehicle-mounted forward-facing camera is equipped with a detector. The lighting module includes a mounting body. The mounting body is movable. The mounting body is equipped with a lighting source and a light filter. The filter is disposed on one side of the vehicle-mounted forward-facing camera so that the light emitted from the illumination source is transmitted to the detector through the filter. The light shield is disposed in the light propagation path of the illumination source, and at least part of the light can be reflected by the light shield to the detector; The measuring device also includes a light-shielding module. The light-shielding module, the lighting module, and the vehicle-mounted front-view camera are installed on the vehicle, and the light-shielding module and the lighting module are located on the outside of the vehicle. The light-shielding module includes a mounting frame and a light-shielding component, the light-shielding component being connected to and covering the mounting frame, the mounting frame being disposed on the hood of the vehicle.

2. The device for measuring the reflectivity of the light shield of a vehicle-mounted forward-looking camera according to claim 1, characterized in that, The measuring device also includes a control module. The control module is connected to the vehicle-mounted forward-facing camera. The control module is also connected to the lighting module. The vehicle-mounted forward-facing camera is located on the inside of the vehicle. The sunshade is located below the vehicle-mounted forward-facing camera. The lighting module is located between the light-shielding module and the vehicle-mounted forward-facing camera. The light-shielding module covers the field of view of the vehicle-mounted forward-facing camera. The light emitted by the illumination source passes through the filter and the windshield of the vehicle before reaching the detector.

3. The device for measuring the reflectivity of the light shield of a vehicle-mounted forward-looking camera according to claim 1, characterized in that, The lighting source is an LED light source, or a combination of an LED light source and a collimating lens, or a fiber-coupled LED light source, or a combination of a broadband light source and a bandpass filter.

4. The device for measuring the reflectivity of the light shield of a vehicle-mounted forward-looking camera according to claim 1, characterized in that, The filter is an absorptive neutral density filter or a reflective neutral density filter; and / or, The surface of the light shield has a serrated structure.

5. The device for measuring the reflectivity of the light shield of a vehicle-mounted forward-looking camera according to claim 1, characterized in that, The light-blocking component is a light-blocking fabric or a black fuzzy self-adhesive board.

6. The device for measuring the reflectivity of the light shield of a vehicle-mounted forward-looking camera according to claim 1, characterized in that, The mounting frame includes metal brackets, and several metal brackets are fixed together to form a grid. The metal brackets are provided with vacuum adsorption disks, which are adsorbed onto the car hood.

7. The device for measuring the reflectivity of the light shield of a vehicle-mounted forward-looking camera according to claim 1, characterized in that, The lighting module also includes a movable bracket connected to the mounting body and connected to the front roof beam of the vehicle.

8. The device for measuring the reflectivity of the light shield of a vehicle-mounted forward-looking camera according to claim 7, characterized in that, The movable bracket includes a first support rod and a second support rod, which are pivotally connected. The second support rod is provided with a vacuum adsorption plate, which is adsorbed onto the front roof crossbeam of the vehicle. The first support rod is slidably connected to the mounting body.

9. A method for measuring the reflectivity of a light shield of a vehicle-mounted forward-looking camera, comprising a reflectivity measuring device, wherein the reflectivity measuring device is the reflectivity measuring device according to any one of claims 1 to 8, and the measurement method comprising: Control the lighting source to emit LED light; Receive preset exposure parameter information; Obtain the reference light intensity value; Obtain the light intensity value of the secondary image; Calculate the reflectivity of the light shield, where, R is the reflectivity of the light shield, I0 is the reference light intensity value, and I is the secondary image light intensity value. is the attenuation coefficient of the filter.

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