Reverse image test and evaluation system and method

Abstract

The present invention discloses a reverse image test and evaluation system and method. By means of the optical display coordinate system constructed by a level, the simulation display of the actual coverage area of the reverse assist line is carried out, replacing the cumbersome operation of manual line drawing. The test can be carried out more quickly and conveniently, and the test efficiency is greatly improved. Combining computer image processing technology, the key dimensions of the actual coverage area of the reverse image assist line are extracted, and the measurement data of the reverse image are automatically obtained, reducing the test errors generated by manual measurement. The test results are more accurate and reliable, and the test accuracy is effectively guaranteed. Finally, the conformity assessment of the dimension measurement results is carried out in combination with the established performance requirements. The present invention can accurately and quickly obtain the dimension data of the actual coverage area of the reverse assist line, and conveniently complete the reverse image test, thereby improving the automation level of the whole process of reverse image test and evaluation, and effectively saving the personnel, site and time costs of the vehicle reverse image test.

Description

Technical Field

[0001] The present invention relates to the technical field of automotive reverse imaging, and particularly to a reverse imaging test and evaluation system and method. Background Art

[0002] An automotive reverse imaging system mainly uses a camera installed at the rear of the vehicle to clearly display the conditions behind the vehicle on a reverse viewing device, and then combines the auxiliary lines calibrated on the reverse viewing interface to give safety warnings for the pre-arrival area of the vehicle, thereby helping the driver better grasp the road conditions behind and quickly, accurately and safely perform reverse operations. It is a very practical driving assistance system.

[0003] The qualification of the calibration data of the reverse assist line in the automotive reverse imaging system directly affects the safety of the reverse imaging system. Therefore, when developing and designing the reverse imaging system, each automobile manufacturer will conduct on-vehicle tests on the actual coverage area of the reverse assist line in combination with industry standards, and then adjust the reverse assist line according to the test results to ensure that the actual coverage area of the reverse assist line meets the design requirements.

[0004] Currently, in the industry, the calibration test of the reverse assist line is mainly carried out by the method of manually drawing lines and manually measuring. That is, on a flat and clean road surface, according to the actual contour of the reverse assist line in the reverse viewing device, the actual landing points of each key point of the reverse assist line are marked on the road surface behind the vehicle by using artificial marking points, and then manual measurement is carried out by using measuring tools to obtain the test data of the actual coverage area of the reverse assist line. This calibration test method is complex in operation, requires multiple people to cooperate, and the data recording is not complete and accurate enough, and it cannot quickly and accurately evaluate the qualification of the reverse imaging calibration result. Summary of the Invention

[0005] In view of the above, the present invention aims to provide a reverse imaging test and evaluation system and method to solve the deficiencies existing in the existing reverse imaging test and evaluation methods.

[0006] The technical solution adopted by the present invention is as follows:

[0007] In a first aspect, the present invention provides a reverse imaging test and evaluation system, which includes:

[0008] A reverse imaging test and evaluation system controller, a test vehicle, at least two spirit levels provided at the rear of the test vehicle, and a reverse imaging camera, a reverse viewing device, and a reverse viewing device capture camera assembled on the test vehicle;

[0009] The level is used to locate and determine the optical display coordinate system behind the test vehicle, and the optical display coordinate system is used to simulate the edge contour of the covered area of the reverse assist line on the road surface with coordinate points, where the reverse assist line includes: a vehicle contour assist line and / or a tire track assist line;

[0010] The reverse image camera is used to collect the reverse image and send it to the reverse visual device for display;

[0011] The reverse visual device capture camera is used to capture the reverse image screen displayed on the reverse visual device;

[0012] The reverse image test and evaluation system controller is used to extract the reverse assist line in the reverse image screen, light up the coordinate points in the optical display coordinate system that match the reverse assist line, obtain and record the key dimension parameters of the covered area of the reverse assist line, and obtain the test results for comparison with the preset technical requirements according to the key dimension parameters.

[0013] In at least one possible implementation, at least one of the levels is arranged on the extension line of the rear bumper of the vehicle, and at least one of the levels is arranged on the extension line of the center line of the test vehicle.

[0014] In at least one possible implementation, the reverse image test and evaluation system controller at least includes: an image processing module and an optical display coordinate control module;

[0015] The image processing module is used to extract the actual reverse assist line in the reverse image screen captured by the reverse visual device capture camera and the auxiliary line edge contour line simulated by the lit coordinate points;

[0016] The optical display coordinate control module is used to trigger the lighting or extinguishing of the coordinate points on the optical display coordinate system.

[0017] In at least one possible implementation, the optical display coordinate control module lights or extinguishes the coordinate points through an optical display coordinate driving module.

[0018] In at least one possible implementation, the reverse image test and evaluation system controller further includes: a CAN data acquisition module, and the CAN data acquisition module is used to collect the steering wheel angle signal in the CAN bus of the test vehicle through the vehicle OBD interface.

[0019] In a second aspect, the present invention provides a reverse image test and evaluation method, which includes:

[0020] Use a level to locate the rearmost end of the rear bumper of the test vehicle and the projection of the center line of the test vehicle on the ground;

[0021] Determine an optical display coordinate system behind the test vehicle according to the projection;

[0022] Trigger the reverse vision device to display a reverse image;

[0023] Continuously capture the display screen of the reverse vision device, and light up the coordinate points in the optical display coordinate system according to the actual reverse assist lines in the display screen to obtain an edge contour line of the simulated assist line;

[0024] Extract and record key dimension parameters of the area covered by the reverse assist line based on the edge contour line of the simulated assist line;

[0025] Evaluate the test result of the reverse image by using the key dimension parameters and preset design requirements.

[0026] In at least one possible implementation manner, the method further includes:

[0027] Obtain the steering wheel angle signal of the test vehicle and determine the attitude of the steering wheel;

[0028] Perform the lighting operation of the coordinate points according to different steering wheel attitudes.

[0029] In at least one possible implementation manner, the lighting of the coordinate points in the optical display coordinate system includes:

[0030] Light up a to-be-determined coordinate point preset in the optical display coordinate system, and extract the position information of the lit to-be-determined coordinate point;

[0031] Compare the position information with the actual reverse assist lines in the display screen;

[0032] If the to-be-determined coordinate point coincides with the actual reverse assist line, use the to-be-determined coordinate point as the target coordinate point and keep it lit; otherwise, turn off the to-be-determined coordinate point;

[0033] Traverse each coordinate point in the optical display coordinate system in the above manner to obtain the edge contour of the actual coverage area of the reverse assist line on the road surface formed by the lit target coordinate points.

[0034] In at least one possible implementation manner, when the reverse assist line is a vehicle contour assist line, the key dimension parameters include: vehicle width, preset rear bumper blind area, horizontal distance between each assist line and the vehicle tail end, and widths of the outermost left and right assist lines;

[0035] When the reverse assist line is the tire track assist line, the key dimensional parameters include: the vehicle width, a preset rear bumper blind area, the horizontal distance between each assist line and the vehicle rear end, the widths of the outermost edge assist lines on the left and right sides, the widths of the outer edge track lines of the left and right tires, and the widths of the inner edge track lines of the left and right tires.

[0036] In at least one possible implementation, the method for obtaining the vehicle width includes: using a level to project the vehicle width enveloped by the outermost extensions of the left and right rearview mirrors of the test vehicle onto the optical display coordinate system, obtaining the spacing dimension representing the vehicle width between the left and right rearview mirrors.

[0037] The main design concept of the present invention lies in that, by means of the optical display coordinate system constructed by a level, the simulation display of the actual coverage area of the reverse assist line is carried out, replacing the cumbersome operation of manual line drawing. The test can be carried out more quickly and conveniently, and the test efficiency is greatly improved; combined with computer image processing technology, the key dimensions of the actual coverage area of the reverse image assist line are extracted, and the measurement data of the reverse image are automatically obtained, reducing the test error generated by manual measurement, and the test results are more accurate and reliable, and the test accuracy is effectively guaranteed; finally, the qualification evaluation is carried out on the dimension measurement results in combination with the established performance requirements. The present invention can accurately and quickly obtain the dimension data of the actual coverage area of the reverse assist line, and conveniently complete the reverse image test, thereby improving the automation level of the whole process of reverse image test and evaluation, and effectively saving the personnel, site and time costs of the vehicle reverse image test. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] To make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described below in conjunction with the accompanying drawings, where:

[0039] Figure 1 is a schematic diagram of the reverse image test and evaluation system provided by an embodiment of the present invention;

[0040] Figure 2 is a flowchart of the reverse image test and evaluation method provided by an embodiment of the present invention

[0041] Figure 3 is a schematic diagram of the ground coverage area of the vehicle contour assist line provided by an embodiment of the present invention;

[0042] Figure 4 is a schematic diagram of the ground coverage area of the tire track assist line provided by an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0043] Embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where like or similar reference numerals denote like or similar elements or elements having like or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention and should not be construed as limiting the present invention.

[0044] An embodiment of a reverse image test and evaluation system is proposed by the present invention. Specifically, as Figure 1 shown, it includes: a reverse image test and evaluation system controller, a test vehicle, at least two spirit levels arranged at the rear of the test vehicle, and a reverse image camera, a reverse visual device, and a reverse visual device capture camera assembled on the test vehicle;

[0045] Among them, the spirit level is mainly used to locate and determine the optical display coordinate system behind the test vehicle. The optical display coordinate system is used to simulate the edge contour of the coverage area of the reverse assist line on the road surface with coordinate points. Here, the reverse assist line includes: a vehicle contour assist line and / or a tire track assist line; specifically, at least one spirit level is arranged on the extension line of the rear bumper of the vehicle (the test vehicle is stationary at a set position, such as a flat test site), and at least one spirit level is arranged on the extension line of the center line of the test vehicle. By arranging the spirit levels at the above positions, the rearmost end of the rear bumper of the test vehicle and the projection of the center line of the test vehicle on the ground can be obtained, so as to locate the optical display coordinate system and ensure that the coordinate origin and center line of the optical display coordinate system coincide with the projection of the rearmost end of the test vehicle bumper and the center line of the vehicle on the ground respectively (as shown in the schematic diagram, the spirit level on the extension line of the rear bumper can be used to form the Y-axis of the coordinate system, and the spirit level on the extension line of the center line of the test vehicle can be used to form the X-axis of the coordinate system);

[0046] The reverse image camera is mainly used to collect the reverse image and send it to the reverse visual device for display;

[0047] The reverse visual device capture camera is mainly used to capture the reverse image screen displayed on the reverse visual device;

[0048] The reverse image test and evaluation system controller is used to extract the reverse assist line in the reverse image screen, light up the coordinate points in the optical display coordinate system that match the reverse assist line, obtain and record the key dimension parameters of the actual coverage area of the reverse assist line, and obtain a test result for comparison with the preset technical requirements according to the key dimension parameters.

[0049] Based on the above embodiments, the controller of the reverse image test and evaluation system at least includes: an image processing module and a light display coordinate control module; the image processing module is mainly used to extract the actual reverse assist line and the edge contour line of the assist line simulated by the lit coordinate points in the reverse image captured by the reverse visible device's capture camera; the light display coordinate control module is used to trigger the lighting or extinguishing of coordinate points in the light display coordinate system. Specifically, the light display coordinate control module can light or extinguish the coordinate points through the light display coordinate driving module.

[0050] In addition, the controller of the reverse image test and evaluation system may further include: a CAN data acquisition module, which is mainly used to collect the steering wheel angle signal in the CAN bus of the test vehicle through the vehicle OBD interface.

[0051] Based on the above embodiments of the system, the present invention also provides an embodiment of a reverse image test and evaluation method, as Figure 2 shown, which may include:

[0052] Step S1: Use a level to locate the rearmost end of the rear bumper of the test vehicle and the projection of the center line of the test vehicle on the ground;

[0053] Step S2: Determine the light display coordinate system behind the test vehicle according to the projection;

[0054] Specifically, the light display coordinates can be installed according to the rearmost end of the rear bumper and the projection of the vehicle center line. During the installation process, it is necessary to make the origin of the light display coordinate system coincide with the projection of the midpoint of the rearmost end of the rear bumper of the test vehicle on the ground, and make the x-axis of the light display coordinate system coincide with the projection of the center line of the test vehicle on the ground.

[0055] Step S3: Trigger the reverse visible device to display the reverse image;

[0056] Specifically, the vehicle ignition switch can be placed in the ON gear (without starting the vehicle), and the reverse gear can be engaged. The observation screen of the reverse image can then be presented on the reverse visible device, and the corresponding assist lines can appear.

[0057] Step S4: Continuously capture the display screen of the reverse visible device, and light the coordinate points in the light display coordinate system according to the actual reverse assist line in the display screen to obtain the simulated edge contour line of the assist line;

[0058] Step S5: Based on the simulated edge contour line of the assist line, extract and record the key dimension parameters of the actual coverage area of the reverse assist line;

[0059] Step S6: Use the key dimension parameters and the preset design requirements to evaluate the reverse image test results.

[0060] Further, the method further includes:

[0061] Obtain the steering wheel angle signal of the test vehicle, and determine the attitude of the steering wheel (return to the straight position or a preset angle, and different steering wheel angle attitudes will result in differences in the reverse assist lines);

[0062] Perform the lighting operation of the coordinate points according to different steering wheel attitudes to verify whether the reverse assist lines at different steering wheel angles are qualified.

[0063] Further, the lighting of the coordinate points in the optical display coordinate system includes:

[0064] Light a preset undetermined coordinate point in the optical display coordinate system, and extract the position information of the lit undetermined coordinate point;

[0065] Compare the position information with the actual reverse assist line in the display screen;

[0066] If the undetermined coordinate point coincides with the actual reverse assist line, use the undetermined coordinate point as the target coordinate point and keep it lit; otherwise, turn off the undetermined coordinate point;

[0067] Traverse each coordinate point in the optical display coordinate system in the above manner to obtain the edge contour of the coverage area of the actual reverse assist line formed by the lit target coordinate points on the road surface.

[0068] It should be noted here that, as mentioned above, the reverse assist lines usually include two types: vehicle contour assist lines and tire track assist lines. Therefore, the coverage areas of the reverse assist lines on the ground are correspondingly different. For details, please refer to Figure 3 and Figure 4 as shown. Based on this:

[0069] (1) If the reverse assist line is a vehicle contour assist line, the key dimension parameters include: vehicle width, preset rear bumper blind area, horizontal distances between each assist line and the vehicle tail end, widths of the left and right outermost assist lines, etc. For details, please refer to Table 1 below.

[0070] Table 1 Vehicle Contour Assist Line Vehicle Reverse Image Test Evaluation Data Record Table

[0071]

[0072] (2) If the reverse assist line is a tire track assist line, the key dimension parameters may include: vehicle width, rear bumper blind area, horizontal distances between each assist line and the vehicle tail end, widths of the left and right outermost assist lines, widths of the left and right tire outer edge track lines, widths of the left and right tire inner edge track lines, etc. For details, please refer to Table 2 below.

[0073] Table 2 Tire Trajectory Auxiliary Line Vehicle Reverse Image Test Evaluation Data Record Table

[0074]

[0075]

[0076] Among them, the method for obtaining the vehicle width includes: the infrared rays emitted by the spirit level project the vehicle width enveloped by the outermost extensions of the left and right rearview mirrors of the test vehicle onto the optical display coordinate system to obtain the vehicle width between the left and right rearview mirrors.

[0077] It can also be supplemented here that, firstly, the letter symbols in the two tables include preset established standard dimensions, which can be set and adjusted according to actual needs, and the present invention does not limit this; secondly, for a vehicle reverse system with both vehicle contour auxiliary lines and tire trajectory auxiliary lines, the key dimension parameters can be the data collection in Table 1 and Table 2.

[0078] Finally, it should be pointed out that the detection and measurement of key dimension parameters using the position information of coordinate points are mature technologies in themselves, and the present invention will not elaborate on this.

[0079] In summary, the main design concept of the present invention is to simulate and display the actual coverage area of the reverse auxiliary line by means of the optical display coordinate system constructed by the spirit level, replacing the cumbersome operation of manual line drawing, making the test more rapid and convenient, and greatly improving the test efficiency; and combining computer image processing technology to extract the key dimensions of the actual coverage area of the reverse image auxiliary line, automatically obtaining the measurement data of the reverse image, reducing the test error generated by manual measurement, making the test results more accurate and reliable, and effectively ensuring the test accuracy; finally, evaluating the qualification of the dimension measurement results in combination with the established performance requirements. The present invention can accurately and quickly obtain the dimension data of the actual coverage area of the reverse auxiliary line, conveniently complete the reverse image test, thereby improving the automation level of the whole process of reverse image test and evaluation, and effectively saving the personnel, site and time costs of the vehicle reverse image test.

[0080] In the embodiments of the present invention, "at least one" means one or more, and "a plurality" means two or more. "And / or" describes the relationship between associated objects and indicates that three relationships may exist. For example, A and / or B may represent the case where A exists alone, A and B exist simultaneously, or B exists alone. Here, A and B may be singular or plural. The character " / " generally indicates that the associated objects before and after are in an "or" relationship. "At least one of the following" and its similar expressions refer to any combination of these items, including any combination of single items or plural items. For example, at least one of a, b, and c may represent: a, b, c, a and b, a and c, b and c, or a and b and c, where a, b, and c may be single or multiple.

[0081] The structure, features, and effects of the present invention have been described in detail based on the embodiments shown in the drawings above. However, the above are only the preferred embodiments of the present invention. It should be noted that for the technical features involved in the above embodiments and their preferred modes, those skilled in the art can reasonably combine and match them into various equivalent solutions without departing from or changing the design concept and technical effects of the present invention. Therefore, the scope of the present invention is not limited by the drawings. Any changes made according to the concept of the present invention or equivalent embodiments modified to equivalent changes, as long as they still fall within the spirit covered by the description and the drawings, shall be within the protection scope of the present invention.

Claims

1. A reverse image test and evaluation system, characterized in that, Comprising: A reverse image test and evaluation system controller, a test vehicle, at least two spirit levels arranged at the rear of the test vehicle, a reverse image camera, a reverse view device, and a reverse view device capture camera assembled on the test vehicle; The spirit level is used to locate and determine the optical display coordinate system behind the test vehicle, and the optical display coordinate system is used to simulate the edge contour of the covered area of the reverse assist line on the road surface with coordinate points, wherein the reverse assist line includes: a vehicle contour assist line and / or a tire track assist line; The reverse image camera is used to collect the reverse image and send it to the reverse view device for display; The reverse view device capture camera is used to capture the reverse image screen displayed by the reverse view device; The reverse image test and evaluation system controller is used to extract the reverse assist line in the reverse image screen, light up the coordinate points in the optical display coordinate system that match the reverse assist line, obtain and record the key dimension parameters of the covered area of the reverse assist line, and obtain a test result for comparison with the preset technical requirements according to the key dimension parameters.

2. The reverse image test and evaluation system according to claim 1, characterized in that, At least one of the spirit levels is arranged on the extension line of the rear bumper of the vehicle, and at least one of the spirit levels is arranged on the extension line of the center line of the test vehicle.

3. The reverse image test and evaluation system according to claim 1, characterized in that The reverse image test and evaluation system controller at least includes: an image processing module and an optical display coordinate control module; The image processing module is used to extract the actual reverse assist line in the reverse image screen captured by the reverse view device capture camera and the auxiliary line edge contour line simulated by the lit coordinate points; The optical display coordinate control module is used to trigger the lighting or extinguishing of the coordinate points on the optical display coordinate system.

4. The reverse image test and evaluation system according to claim 3, wherein The optical display coordinate control module lights or extinguishes the coordinate points through an optical display coordinate drive module.

5. The reverse image test and evaluation system according to any one of claims 1 to 4, characterized in that, The reverse image test and evaluation system controller further includes: a CAN data acquisition module, and the CAN data acquisition module is used to acquire the steering wheel angle signal in the CAN bus of the test vehicle through the vehicle OBD interface.

6. A reverse image test and evaluation method, characterized in that, Comprising: Using a spirit level to locate the rearmost end of the rear bumper of the test vehicle and the projection of the center line of the test vehicle on the ground; Determining the optical display coordinate system behind the test vehicle according to the projection; Triggering the reverse view device to display the reverse image; Continuously capturing the display screen of the reverse view device, and lighting the coordinate points in the optical display coordinate system according to the actual reverse assist line in the display screen to obtain a simulated auxiliary line edge contour line; Based on the simulated auxiliary line edge contour line, extracting and recording the key dimension parameters of the covered area of the reverse assist line; Using the key dimension parameters and the preset design requirements to evaluate the reverse image test result.

7. The reverse image test and evaluation method according to claim 6, wherein The method further includes: Obtaining the steering wheel angle signal of the test vehicle and determining the attitude of the steering wheel; Performing the lighting operation of the coordinate points according to different steering wheel attitudes.

8. The reverse image test and evaluation method according to claim 6, characterized in that, The lighting of the coordinate points in the optical display coordinate system includes: Lighting a preset pending coordinate point in the optical display coordinate system and extracting the position information of the lit pending coordinate point; Comparing the position information with the actual reverse assist line in the display screen; If the coordinate point to be determined coincides with the actual reverse assist line, then use the coordinate point to be determined as the target coordinate point and keep it lit; otherwise, turn off the coordinate point to be determined. Traverse each coordinate point in the optical display coordinate system to obtain the edge contour of the actual coverage area of the reverse assist line formed by the lit target coordinate points on the road surface.

9. The reverse image test and evaluation method according to any one of claims 6 to 8, characterized in that When the reverse assist line is the vehicle contour assist line, the key dimensional parameters include: vehicle width, preset rear bumper blind area, horizontal distance between each assist line and the vehicle tail end, and widths of the left and right outermost assist lines. When the reverse assist line is the tire track assist line, the key dimensional parameters include: vehicle width, preset rear bumper blind area, horizontal distance between each assist line and the vehicle tail end, widths of the left and right outermost assist lines, widths of the left and right outer tire edge track lines, and widths of the left and right inner tire edge track lines.

10. The reverse image test and evaluation method according to claim 9, characterized in that The method for obtaining the vehicle width includes: using a level to project the vehicle width enveloped by the outermost extensions of the left and right rearview mirrors of the test vehicle onto the optical display coordinate system to obtain the spacing dimension representing the vehicle width between the left and right rearview mirrors.

Images