A vehicle BSD signal testing device and testing method

Abstract

The present invention provides a vehicle BSD signal testing device, which includes a sealed box body. On one set of side plates of the sealed box body, there are an opening one corresponding to the vehicle rearview mirror and an opening two for installing an auxiliary light source. A flexible inner lining for preventing light leakage is arranged at the opening one. On the back plate of the sealed box body close to the rear of the vehicle, there is an opening three. A baffle one is hinged at the opening three. A moving mechanism is fixedly arranged on the inner wall of the baffle one, and an optical camera is installed on the moving mechanism. A fixing bracket for fixing the box body main body on the outer wall of the vehicle body is fixedly connected to the outer wall of the sealed box body. The vehicle BSD signal testing device and testing method of the present invention realize the effective identification of BSD signals in autonomous driving road tests, and have the advantages of being not interfered by the external environment, having multi-parameter custom adjustment, having a relatively high recognition accuracy, having stable and efficient signal output, being convenient to install, and being vehicle type universal.

Description

Technical Field

[0001] The present invention belongs to the technical field of autonomous vehicle testing, and particularly relates to a vehicle BSD signal testing device and a testing method. Background Art

[0002] With the continuous development of autonomous driving technology, vehicles equipped with L2-level autonomous driving systems are gradually mass-produced and popularized, which brings great convenience to daily driving. However, it also puts forward new requirements for the detection and certification of automotive active safety functions. BSD (Blind Spot Detection) is a type of technology in advanced driver assistance systems (ADAS), which can monitor whether there are pedestrians or other vehicles in the blind spot of the vehicle, and prompt the driver through alarms and other means to avoid traffic accidents.

[0003] At the present stage, the testing equipment is relatively simple, and the BSD signal is only recognized by fixing an optical camera in an exposed environment. The C-NCAP 2021 version of the active safety test regulations puts forward clear requirements for the light intensity. The ambient light intensity must be greater than 2000 Lux. In this kind of strong light outdoor test field environment, after the previous equipment completes static debugging, due to the dynamic influence of the shadows of surrounding obstacles during the test process, the environmental parameters will fluctuate greatly, resulting in test results with low recognition accuracy and unstable output digital signals, and the test cannot achieve the expected effect. Therefore, this patent application designs a vehicle BSD signal testing device and a testing method. Summary of the Invention

[0004] In view of this, the present invention aims to provide a vehicle BSD signal testing device and a testing method to solve the problems that the existing equipment is greatly affected by the test environment, resulting in low recognition accuracy and unstable output digital signals in the test results.

[0005] To achieve the above object, the technical solution of the present invention is realized as follows:

[0006] In a first aspect, the present invention provides a vehicle BSD signal testing device, including a sealed box body. One set of side plates of the sealed box body is provided with an opening one corresponding to the vehicle rearview mirror and an opening two for installing an auxiliary light source. A flexible inner lining for preventing light leakage is arranged at the opening one. An opening three is provided on the back plate of the sealed box body close to the rear of the vehicle. A shutter one is hinged at the opening three. A moving mechanism is fixedly arranged on the inner wall of the shutter one, and an optical camera is installed on the moving mechanism.

[0007] Further, the sealed box body is a closed six-sided box body structure, and the inner surface of the sealed box body is flat and light-tight.

[0008] Further, the auxiliary light source is fixedly installed on the inner wall of the side plate located at the position of the second opening;

[0009] A U-shaped plate is arranged on the outer wall of the side plate at the second opening. A slot is arranged inside the U-shaped plate, and a second baffle plate is movably pulled out in the slot.

[0010] Further, the moving mechanism includes support rods. The number of support rods is two groups. The two groups of support rods are arranged in parallel. The two ends of the support rods are respectively fixedly installed on the inner wall of the first baffle plate through support seats. Sliding supports are slidably arranged on the two groups of support rods. Fixing bolts for fixing it on the support rods are arranged on the sliding supports;

[0011] A connecting rod is arranged between the two groups of sliding supports. A support base is slidably arranged on the connecting rod. Fixing bolts for fixing it on the connecting rod are also arranged on the support base. The optical camera is fixedly installed on the support base.

[0012] Further, a fixing bracket for fixing the box body main body on the outer wall of the vehicle body is fixedly connected to the outer wall of the sealed box body; The fixing bracket includes two groups of fixing rods. The two groups of fixing rods are rotatably connected through a connecting shaft. A fastening knob is arranged at the rotating part of the fixing rod. Among them, one end of one group of fixing rods is connected with a multi-degree-of-freedom rotating ball head through a constant velocity joint. An installation bolt is fixedly connected to the multi-degree-of-freedom rotating ball head. The installation bolt is fixedly installed on the outer wall of the sealed box body. A constant velocity joint is also fixedly arranged at one end of the other group of fixing rods. The constant velocity joint is connected with a vacuum sucker for adsorbing on the vehicle body surface through a multi-degree-of-freedom rotating ball head.

[0013] In the second aspect, the present invention provides a method for testing the BSD signal of a vehicle. Based on the testing device described in the first aspect, it specifically includes the following steps: S1. Debug the optical camera, manually trigger the BSD signal, make the BSD signal area located in the center of the imaging screen, and collect the rearview mirror image in real time through the optical camera;

[0014] S2. Mark the key recognition area for the obtained rearview mirror image;

[0015] S3. Select any feature point in the key recognition area, and calibrate the normal gray value corresponding to the any feature point, and define it as digital signal 0;

[0016] S4. Manually trigger the BSD signal, calibrate the excited-state gray value corresponding to the any feature point in step S3, and define it as digital signal 1;

[0017] S5. Conduct a formal test, use the acquisition software to scan the gray value of the feature point at a high frequency, and output the corresponding digital signal.

[0018] Further, the principle for selecting the key recognition regions in step S2 includes the normal state region and the excited state region, and there are obvious gray-scale differences between the two selected regions.

[0019] Further, the specific method of step S3 is as follows: within the selected normal state region, any but valid feature points are selected according to the specific characteristics of the BSD signal, and the normal gray-scale values of these feature points are calculated and calibrated through an image recognition algorithm, and the gray-scale values of each point in the current state are defined as digital signal 0.

[0020] Further, the BSD signal of the vehicle is manually triggered by means of vehicle head unit function settings, etc., the excited state region corresponding to the triggering moment is captured, and the excited state gray-scale values corresponding to the feature points selected in step S3 are calculated and calibrated through an image recognition algorithm, and the gray-scale values of each point in the current state are defined as digital signal 1.

[0021] Further, the specific method of step S4 is as follows: when using the device to conduct the formal BSD signal test, the image recognition algorithm performs high-frequency scanning on the key recognition regions in a traversal manner, calculates the gray-scale values of the feature points in sequence in a loop, determines the digital signal corresponding to the current gray-scale value, and finally continuously outputs digital signal 0 / 1 to achieve the purpose of recognizing the BSD signal.

[0022] Compared with the prior art, the vehicle BSD signal testing device and testing method of the present invention have the following beneficial effects:

[0023] (1) The vehicle BSD signal testing device of the present invention is easy and firm to install, has strong practicability. By using an optical camera with an image recognition function, it can record the real-time picture of the rearview mirror area, capture the BSD signal at the same time, and output and record the corresponding digital signal. By setting a fixed bracket, the fixation and custom position adjustment of the optical camera are realized, solving the problems in the prior art that are easily interfered by environmental factors, resulting in unstable image recognition and low recognition accuracy, and improving the ability to test the BSD function signal in the active safety road test;

[0024] (2) The vehicle BSD signal testing method of the present invention realizes the effective recognition of the BSD signal in the autonomous driving road test, and has the advantages of being not affected by the external environment, multi-parameter custom adjustment, high recognition accuracy, stable and efficient signal output, convenient installation, and vehicle model universality. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0026] Figure 1Schematic diagram of projections of all sides of the sealed box body and accessories according to the embodiments of the present invention;

[0027] Figure 2 Schematic diagram of the fixed bracket according to the embodiments of the present invention;

[0028] Figure 3 Flowchart of a vehicle BSD signal testing method according to the embodiments of the present invention.

[0029] Explanation of reference numerals:

[0030] 1. Sealed box body; 101. First opening; 102. Second opening; 103. Flexible inner lining; 104. Mounting screw holes; 2. First baffle; 3. Moving mechanism; 301. Support rod; 302. Support seat; 303. Sliding support; 304. Connecting rod; 305. Support base; 4. Fixed bracket; 401. Fixed rod; 402. Connecting shaft; 403. Mounting bolt; 404. Multi-degree-of-freedom rotating ball head; 405. Vacuum suction cup. Detailed implementation manners

[0031] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments may be combined with each other.

[0032] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more.

[0033] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "mount", "connected", "connection" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0034] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0035] Please refer to Figure 1 As shown, an embodiment of the present invention provides a vehicle BSD signal testing device, including a sealed box body 1. On one set of side plates of the sealed box body 1, there are an opening one 101 corresponding to the vehicle rearview mirror and an opening two 102 for installing an auxiliary light source. The auxiliary light source is not shown in the accompanying drawings. The auxiliary light source has the functions of stable light intensity and replaceability. The auxiliary light source can provide all-weather stable and fixed light intensity for the enclosed space inside the device, providing an environmental basis for high-quality image recognition. At the opening one 101, there is a flexible inner lining 103 for preventing light leakage. The flexible inner lining 103 refers to a soft fabric attached around the rearview mirror mounting opening, mainly playing a role in filling the gap area at the opening. The flexible inner lining 103 has a strong light absorption function. The flexible inner lining 103 with a strong light absorption function can further seal the opening at the rearview mirror, avoiding environmental light from leaking in, and at the same time can protect the device wiring harness.

[0036] On the back plate of the sealed box body 1 close to the rear of the vehicle, there is an opening three. A shutter one 2 is hinged at the opening three. A moving mechanism 3 is fixedly arranged on the inner wall of the shutter one 2. An optical camera with an image recognition function is installed on the moving mechanism 3 to record the real-time picture of the rearview mirror area.

[0037] There are three openings on the sealed box body 1, which are respectively used for clamping the vehicle rearview mirror, installing the optical camera, and the auxiliary light source. The optical camera is connected to an external processor device through a data connection line for collecting and processing image information data. The auxiliary light source can be flexibly fixed inside the sealed box body 1 by means of magnet adsorption, etc., and can be conveniently replaced when the light intensity requirement cannot be met by the auxiliary light source.

[0038] The sealed box body 1 with light-tight properties can completely wrap the vehicle rearview mirror. The light-tight property means that environmental light cannot penetrate the sealed box body 1 into the interior; creating an approximately enclosed dark environment, and there are three openings for adjusting the parameters and positions of different devices. At the same time, the sealed box body 1 is equipped with a multi-degree-of-freedom adjustable fixing bracket 4, which can customize the fixing position.

[0039] The sealed box body 1 is a closed six-sided box structure. The inner surface of the sealed box body 1 is flat and light-tight. There are at least 3 or more mounting screw holes 104 on the sealed box body 1; the mounting bolts 403 provided at one end of the fixing bracket 4 are fixedly connected corresponding to the mounting screw holes 104.

[0040] The auxiliary light source is fixedly installed on the inner wall of the side plate at the position of the opening two 102;

[0041] On the outer wall of the side plate at the opening two 102, there is a U-shaped plate. There is a slot inside the U-shaped plate, and a shutter two is movably pulled inside the slot.

[0042] The moving mechanism 3 includes support rods 301. The number of support rods 301 is two groups, and the two groups of support rods 301 are arranged in parallel. Both ends of the support rods 301 are fixedly installed on the inner wall of the first baffle 2 through support seats 302. Sliding supports 303 are slidably arranged on both groups of support rods 301, and fixing bolts for fixing it on the support rods 301 are provided on the sliding supports 303;

[0043] An connecting rod 304 is arranged between the two groups of sliding supports 303. A support base 305 is slidably arranged on the connecting rod 304, and fixing bolts for fixing it on the connecting rod 304 are also provided on the support base 305. The optical camera is fixedly installed on the support base 305;

[0044] During use, open the first baffle 2, install the optical camera on the support base 305, and adjust the position of the camera by adjusting the support base 305. When using the device, the first baffle 2 is in a normally closed state.

[0045] As Figure 2 shown, a fixing bracket 4 for fixing the box body main body on the outer wall of the vehicle body is fixedly connected to the outer wall of the sealed box body 1;

[0046] The number of fixing brackets 4 is multiple groups. Each group of fixing brackets 4 includes two fixing rods 401. The two fixing rods 401 are rotatably connected through a connecting shaft 402. A fastening knob is arranged at the rotating part of the fixing rod 401. Among them, one end of one group of fixing rods 401 is connected with a multi-degree-of-freedom rotating ball head 404 through a constant velocity joint. An installation bolt 403 is fixedly connected to the multi-degree-of-freedom rotating ball head 404, and the installation bolt 403 is correspondingly connected to the installation screw hole 104 provided on the sealed box body 1. One end of the other group of fixing rods 401 is also fixedly provided with a constant velocity joint. The constant velocity joint is connected with a vacuum suction cup 405 for adsorbing on the vehicle body surface through a multi-degree-of-freedom rotating ball head 404;

[0047] By providing the fixing bracket 4, the position of the sealed box body 1 can be adjusted with multiple degrees of freedom, and the adjustment is relatively flexible.

[0048] As Figure 3 shown, an embodiment of the present invention also provides a vehicle BSD signal testing method. Based on the testing device described in the above embodiment, it specifically includes the following steps: S1. Debug the optical camera, manually trigger the BSD signal to make the BSD signal area located in the center of the imaging screen, and continue to adjust parameters such as the focal length of the optical camera, the position and light intensity of the auxiliary light source to make the imaging effect of the BSD signal area reach the best state, and collect the rearview mirror image in real time through the optical camera;

[0049] S2. Mark the key recognition area on the obtained rearview mirror image;

[0050] S3. Select any feature point within the key recognition area, calibrate the normal gray value corresponding to the any feature point, and define it as digital signal 0;

[0051] S4. Manually trigger the BSD signal, calibrate the excited-state gray value corresponding to the any feature point in step S3, and define it as digital signal 1;

[0052] S5. Conduct a formal test, use the acquisition software to high-frequency scan the gray values of the feature points, and output the corresponding digital signals.

[0053] The selection principles of the key recognition area in step S2 include the normal area and the excited-state area. The selected two areas have obvious gray-scale differences. This operation will reduce the operating pressure of the image recognition algorithm and reduce the high-frequency scanning in meaningless areas. The image recognition algorithm involved in this technical solution is a conventional technical means well-known to those skilled in the art. This patent application does not make any improvement to the algorithm itself. Therefore, no further elaboration will be made.

[0054] The specific method of step S3 is: within the selected normal area, select any but effective feature point according to the specific characteristics of the BSD signal, calculate and calibrate the normal gray value of the feature point through the image recognition algorithm, and define the gray values of each point in the current state as digital signal 0.

[0055] Manually trigger the BSD signal of the vehicle through methods such as vehicle head unit function settings, capture the excited-state area corresponding to the trigger moment, calculate and calibrate the excited-state gray value corresponding to the feature point selected in step S3 through the image recognition algorithm, and define the gray values of each point in the current state as digital signal 1.

[0056] The specific method of step S4 is: when using the device to conduct a formal BSD signal test, the image recognition algorithm takes a traversal method to high-frequency scan the key recognition area, sequentially calculate the gray values of the feature points in a loop, determine the digital signal corresponding to the current gray value, and finally continuously output digital signal 0 / 1 to achieve the purpose of identifying the BSD signal.

[0057] This method solves the problems in the prior art such as being vulnerable to environmental factors interference, unstable recognition, and low recognition accuracy, improves the ability to test the BSD function signal in the active safety road test, and has strong practicability.

[0058] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A vehicle BSD signal testing device, characterized in that: It includes a sealed box body (1). On one set of side plates of the sealed box body (1), there are an opening one (101) corresponding to the vehicle rearview mirror and an opening two (102) for installing an auxiliary light source. A flexible inner lining (103) for preventing light leakage is arranged at the opening one (101). On the back plate of the sealed box body (1) close to the rear of the vehicle, there is an opening three. A shutter one (2) is hinged at the opening three. A moving mechanism (3) is fixedly arranged on the inner wall of the shutter one (2), and an optical camera is installed on the moving mechanism (3). The moving mechanism (3) includes support rods (301). The number of support rods (301) is two groups. The two groups of support rods (301) are arranged in parallel. The two ends of the support rods (301) are respectively fixedly installed on the inner wall of the shutter one (2) through support seats (302). Sliding supports (303) are slidably arranged on the two groups of support rods (301). Fixing bolts for fixing it on the support rods (301) are arranged on the sliding supports (303). A connecting rod (304) is arranged between the two groups of sliding supports (303). A support base (305) is slidably arranged on the connecting rod (304). Fixing bolts for fixing it on the connecting rod (304) are also arranged on the support base (305). The optical camera is fixedly installed on the support base (305). A fixing bracket (4) for fixing the box body main body on the outer wall of the vehicle body is fixedly connected to the outer wall of the sealed box body (1). The number of fixing brackets (4) is multiple groups. Each group of fixing brackets (4) includes two fixing rods (401). The two fixing rods (401) are rotatably connected through a connecting shaft (402). A fastening knob is arranged at the rotating part of the fixing rod (401). Among them, one end of one fixing rod (401) is connected with a multi-degree-of-freedom rotating ball head (404) through a ball cage. An installation bolt (403) is fixedly connected to the multi-degree-of-freedom rotating ball head (404). The installation bolt (403) is fixedly installed on the outer wall of the sealed box body (1). The end of the other fixing rod (401) is also fixedly provided with a ball cage. The ball cage is connected with a vacuum suction cup (405) for adsorbing it on the vehicle body surface through a multi-degree-of-freedom rotating ball head (404).

2. The vehicle BSD signal testing device according to claim 1, characterized in that: The sealed box body (1) is a six-sided box structure. The inner surface of the sealed box body (1) is flat and light-tight.

3. The vehicle BSD signal testing device according to claim 1, wherein: The auxiliary light source is fixedly installed on the inner wall of the side plate at the position of the opening two (102). A U-shaped plate is arranged on the outer wall of the side plate at the opening two (102). A slot is arranged inside the U-shaped plate, and a shutter two is movably drawn in the slot.

4. A vehicle BSD signal testing method, characterized in that, Based on the testing device according to any one of claims 1 - 3, it specifically includes the following steps: S1. Debug the optical camera, manually trigger the BSD signal to make the BSD signal area located in the center of the imaging screen, and collect the rearview mirror image in real time through the optical camera. S2. Mark the key recognition area for the obtained rearview mirror image. Among them, the selection principle of the key recognition area includes the normal state area and the excited state area, and there are obvious gray-scale differences between the two selected areas. S3. Select any feature point within the key recognition area, calibrate the normal gray value corresponding to the any feature point, and define it as digital signal 0; The specific method of step S3 is as follows: within the selected normal area, select any but effective feature point according to the specific characteristics of the BSD signal, calculate and calibrate the normal gray value of this feature point through an image recognition algorithm, and define the gray value of each point in the current state as digital signal 0; S4. Manually trigger the BSD signal, calibrate the excited-state gray value corresponding to any feature point in step S3, and define it as digital signal 1; The specific method of step S4 is as follows: manually trigger the BSD signal of the vehicle by means of in-vehicle function settings, etc., capture the excited-state area corresponding to the trigger moment, calculate and calibrate the excited-state gray value corresponding to the feature point selected in step S3 through an image recognition algorithm, and define the gray value of each point in the current state as digital signal 1; S5. Conduct a formal test, use the acquisition software to scan the gray value of the feature point at a high frequency, and output the corresponding digital signal.

5. A vehicle BSD signal test method according to claim 4, wherein: The specific method of step S4 is as follows: when using the device to conduct a formal BSD signal test, the image recognition algorithm performs a high-frequency scan of the key recognition area in a traversal manner, calculates the gray value of the feature point sequentially in a loop, determines the digital signal corresponding to the current gray value, and finally continuously outputs digital signal 0 / 1 to achieve the purpose of recognizing the BSD signal.

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