Method and system for acquiring black edge position of automobile glass and measuring light transmission area of glass

Abstract

The invention discloses a method for acquiring the position of a black edge of automobile glass and measuring the light-transmitting area of the glass. The method comprises the following steps: sticking a whole circle of adhesive tape along the inner edge of the black edge of the automobile glass; uniformly spraying a developing agent on the surfaces of the automobile glass and the adhesive tape; pasting a plurality of positioning mark points which are distributed disorderly on the surface of the automobile glass, wherein the positioning mark points avoid the adhesive tape; tearing off the adhesive tape from the inner edge of the automobile glass black edge; three-dimensional laser scanning is conducted on the automobile glass in the glass area where the developing agent is not sprayed, the glass area where the developing agent is not sprayed in the automobile glass point cloud corresponds to a point-cloud-free area, and the point-cloud-free area is an automobile glass black edge contour line; the point cloud area on the inner side of the glass black edge contour line in the automobile glass point cloud is a glass light-transmitting area, and the area of the glass light-transmitting area is calculated according to the point cloud on the inner side of the glass black edge contour line. According to the method, the accuracy of obtaining the position of the glass black edge contour line and the accuracy of calculating the area of the glass light-transmitting region are improved.

Description

Technical Field

[0001] The invention relates to the technical field of curved glass profile measurement, and in particular to a method and system for obtaining the position of a black edge of automobile glass and measuring the light-transmitting area of ​​the glass. Background Art

[0002] The position of the black border of automobile glass and the light-transmitting area of ​​the glass are important benchmarks for measuring parameters related to the driver's field of vision. They will have a direct impact on the driver's field of vision, driving safety and comfort, and are also one of the important measurement parameters in the reverse development process of automobiles.

[0003] Although currently, the size, shape, surface quality and defects of automobile glass can be accurately detected by collecting high-precision 3D laser point clouds and comprehensively measuring the car, these methods cannot effectively measure the position of the black edge contour of the glass and the area of ​​the light-transmitting area of ​​the glass. Traditionally, the position measurement of the black edge of the glass is mostly obtained by using a ruler to obtain an approximate value and estimate the driver's field of view. This method is obviously not accurate enough. Summary of the invention

[0004] The purpose of the present invention is to provide a method and system for obtaining the position of the black edge of automobile glass and measuring the light-transmitting area of ​​the glass. The method improves the accuracy of obtaining the position of the black edge contour line of the glass and the accuracy of calculating the light-transmitting area of ​​the glass.

[0005] To achieve this purpose, the method designed by the present invention for obtaining the position of the black edge of automobile glass and measuring the light transmission area of ​​the glass is characterized in that it comprises the following steps:

[0006] Apply the tape along the inner edge of the black side of the car glass in a full circle;

[0007] Use a developer to evenly spray it on the automobile glass and the surface of the tape;

[0008] A plurality of randomly distributed positioning marks are pasted on the surface of the automobile glass, and the positioning marks avoid the adhesive tape;

[0009] The adhesive tape is torn off from the inner edge of the black side of the automobile glass, leaving a glass area on which the developer is not sprayed at the inner edge of the black side of the automobile glass;

[0010] A three-dimensional laser scan is performed on the automobile glass with a glass area that is not sprayed with developer. During the scanning process, a point cloud of the automobile glass is generated according to the identified positioning points. In the automobile glass point cloud, the glass area that is not sprayed with developer corresponds to an area without a point cloud, and the area without a point cloud is the black edge contour line of the automobile glass; in the automobile glass point cloud, the point cloud area inside the black edge contour line of the glass is the glass translucent area, and the area of ​​the glass translucent area is calculated based on the point cloud inside the black edge contour line of the glass.

[0011] In the above technical solution, the distance between two adjacent positioning marks ranges from 15 to 20 cm, positioning marks need to be distributed in each area of ​​the glass, and the positioning marks are randomly distributed in each area of ​​the glass.

[0012] In three-dimensional laser scanning, the glass surface sprayed with developer and the glass surface without developer have different refractive indices. The same laser power is irradiated on surfaces with different refractive indices to generate a point cloud of automobile glass with a point cloud-free area.

[0013] In the above technical solution, the specific method for calculating the area of ​​the glass light-transmitting area based on the point cloud inside the black edge contour of the glass is:

[0014] The point cloud inside the black edge contour line of the glass is imported into the digital shape editor of the CATIA software, and the point cloud inside the black edge contour line of the glass is converted into a mesh surface to obtain the area of ​​the glass translucent region.

[0015] In the above technical solution, the digital shape editor converts the point cloud inside the black edge contour of the glass into corresponding triangular mesh surfaces, and adds up the areas of all triangular mesh surfaces to obtain the area of ​​the glass translucent region.

[0016] A system for obtaining the position of the black edge of automobile glass and measuring the light-transmitting area of ​​the glass based on the above method, comprising a glass black edge position obtaining module and a glass light-transmitting area obtaining module;

[0017] The glass black edge position acquisition module uses a 3D laser scanner to perform 3D laser scanning on the automobile glass with the glass area without developer sprayed, and generates the automobile glass point cloud according to each identified positioning mark in the scanning process. In the automobile glass point cloud, the glass area without developer sprayed corresponds to the area without point cloud, and the area without point cloud is the outline of the black edge of the automobile glass;

[0018] The glass light-transmitting area acquisition module is used to calculate the area of ​​the glass light-transmitting area according to the point cloud inside the black edge contour line of the glass. The glass light-transmitting area is the point cloud area inside the black edge contour line of the glass in the point cloud of the automobile glass.

[0019] Beneficial effects of the present invention:

[0020] This patent uses a laser scanner to irradiate surfaces with different refractive indices with the same laser power to generate point cloud surfaces with different characteristics, which can accurately obtain the position of the black edge contour of the glass and the light-transmitting area of ​​the glass. In the entire process of the present invention, from spraying the developer to three-dimensional laser scanning, to data processing and area calculation, it can be highly automated, reducing manual intervention and improving work efficiency. The present invention is not only suitable for automotive glass of standard shapes, but also can well cope with glass edges of various complex shapes and curves, making it possible to measure automotive glass of different models. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a result schematic diagram of the present invention.

[0022] Figure 2 It is the inner edge of the black side of the glass;

[0023] Figure 3 Developer sprayed automotive surfaces;

[0024] Figure 4 Several randomly distributed positioning points;

[0025] Figure 5 It is the glass area where the developer is not sprayed at the black edge;

[0026] Figure 6 The developer used;

[0027] Figure 7 Laser scanning diagram

[0028] Figure 8 Generated 3D point cloud data

[0029] Fig. 9 Schematic diagram of glass light-transmitting area

[0030] In the figure, 1 is the inner edge of the black border of the automobile glass, 2 is the automobile glass, 3 is the positioning mark, and 4 is the glass area with no developer sprayed on it. DETAILED DESCRIPTION

[0031] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments:

[0032] Example 1

[0033] A method for obtaining the position of the black edge of automobile glass and measuring the light transmission area of ​​the glass, such as Figure 1 , which includes the following steps:

[0034] Stick the tape along the inner edge of the black side of the car glass 1 in a full circle to obtain the position of the black side of the glass, such as Figure 2 As shown;

[0035] Use a developer (DPT-9 developer is used in this embodiment) to evenly spray it on the surface of the automobile glass 2 and the tape. Figure 3 As shown in the figure, the method of using tape and developer can very accurately define the inner edge of the black edge of the car glass. This method reduces human errors and improves measurement accuracy.

[0036] A plurality of randomly distributed positioning marks 3 are pasted on the surface of the automobile glass 2, and the positioning marks 3 avoid the adhesive tape, such as Figure 4 As shown;

[0037] The adhesive tape is torn off from the inner edge 1 of the black side of the automobile glass, leaving a glass area 4 where the developer is not sprayed at the inner edge 1 of the black side of the automobile glass. Figure 5 ;

[0038] A three-dimensional laser scan is performed on the automobile glass 2 having the glass area 4 without the developer sprayed thereon, such as Figure 6 During the scanning process, the automobile glass point cloud is generated according to the identified positioning points 3, such as Figure 7 ,The point cloud data generated by 3D laser scanning can intuitively display the shape and contour of the automobile glass, including the black edge contour line and the light-transmitting area. In the automobile glass point cloud, the glass area 4 where the developer is not sprayed corresponds to the area without point cloud. The area without point cloud is the black edge contour line of the automobile glass, such as Figure 8 ; The point cloud area inside the black edge contour line of the glass in the automobile glass point cloud is the glass transparent area. The area of ​​the glass transparent area is calculated based on the point cloud inside the black edge contour line of the glass, such as Fig. 9 .

[0039] In the above technical solution, the three-dimensional laser scanning technology is a non-contact measurement method, which avoids damage or scratches to the glass surface that may be caused by physical contact, and also improves the safety and efficiency of the measurement.

[0040] In the above technical solution, the developer is sprayed on the surface of the automobile glass 2 and the adhesive tape to form a developer coating, and the developer coating completely covers the surface of the automobile glass 2 and the adhesive tape.

[0041] In the above technical solution, the developer coating can refract the laser during three-dimensional laser scanning. During the three-dimensional laser scanning process, the scanner generates point cloud data by identifying the reflected light on the surface of the object. Because the developer changes the optical properties of the glass surface (such as reflectivity, color, etc.), the glass area sprayed with the developer and the glass area not sprayed with the developer show different characteristics in the scanning results. This difference helps the scanner to more accurately identify and distinguish different parts of the car glass, especially the glass area without the developer (i.e., the black edge contour of the car glass). The use of the developer also helps to reduce measurement errors caused by human factors or environmental factors. For example, in the absence of developer, if there are interference factors such as stains, scratches or light changes on the surface of the car glass, it may affect the recognition accuracy of the scanner. The clear contrast area formed by the developer can reduce the impact of these interference factors to a certain extent and improve the reliability of the measurement results.

[0042] In the above technical solution, the distance between two adjacent positioning marks 3 ranges from 15 to 20 cm, positioning marks 3 need to be distributed in each area of ​​the glass, and the positioning marks 3 are randomly distributed in each area of ​​the glass.

[0043] In the above technical solution, when scanning the positioning marks, start from the middle of the car glass and scan to both sides of the car glass with a three-dimensional laser scanner, and identify the positioning marks on the car glass through the lens of the three-dimensional laser scanner.

[0044] In the above technical solution, in three-dimensional laser scanning, the glass surface sprayed with developer and the glass surface without developer have different refractive indices. The same laser power is irradiated on surfaces with different refractive indices to generate a point cloud of automobile glass with a point cloud-free area.

[0045] In the above technical solution, the specific method for calculating the area of ​​the glass light-transmitting area based on the point cloud inside the black edge contour of the glass is:

[0046] Import the point cloud of the inner side of the black edge contour of the glass into the digital shape editor of the CATIA software, and convert the point cloud of the inner side of the black edge contour of the glass into a mesh surface to obtain the area of ​​the glass light-transmitting area. The digital shape editor of the CATIA software can accurately process point cloud data and fit the discrete point cloud data into a continuous mesh surface through an algorithm. This fitting process can reduce the error caused by the discreteness of the point cloud data and improve the accuracy of data processing. During the fitting process, CATIA can reconstruct the surface shape of the glass light-transmitting area to make it closer to the actual situation.

[0047] In the above technical solution, the digital shape editor converts the inner point cloud of the black edge contour of the glass into each corresponding triangular mesh surface, and adds up the areas of all triangular mesh surfaces to obtain the area of ​​the glass light-transmitting area. As a basic geometric unit, the area calculation of the triangular mesh surface has a high geometric accuracy. By accumulating the areas of all triangular mesh surfaces, a more accurate total area of ​​the glass light-transmitting area can be obtained.

[0048] Example 2

[0049] A system for obtaining the position of the black edge of automobile glass and measuring the light-transmitting area of ​​the glass based on the above method, comprising a glass black edge position obtaining module and a glass light-transmitting area obtaining module;

[0050] The glass black edge position acquisition module uses a three-dimensional laser scanner to perform three-dimensional laser scanning on the automobile glass 2 having the glass area 4 without the developer sprayed thereon, and generates an automobile glass point cloud according to each identified positioning mark 3 during the scanning process. In the automobile glass point cloud, the glass area 4 without the developer sprayed thereon corresponds to a point cloud-free area, and the point cloud-free area is the outline of the automobile glass black edge;

[0051] The glass light-transmitting area acquisition module is used to calculate the area of ​​the glass light-transmitting area based on the point cloud inside the black edge contour line of the glass. The glass light-transmitting area is the point cloud area inside the black edge contour line of the glass in the point cloud of the automobile glass. The above method can provide important data support for automobile designers and manufacturers by accurately measuring the area of ​​the glass light-transmitting area, helping them optimize glass design and improve product performance and aesthetics.

[0052] Example 3

[0053] A computer program product includes a computer program, and when the computer program is executed by a processor, the system described in Example 2 is implemented.

[0054] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

[0055] Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0056] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A system that specifies the functions of a box or multiple boxes.

[0057] These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer-readable memory produce a product including an instruction system, which is implemented in the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0058] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0059] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit its protection scope. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the field should understand that after reading the present invention, those skilled in the art can still make various changes, modifications or equivalent substitutions to the specific implementation methods of the invention, but these changes, modifications or equivalent substitutions are all within the protection scope of the pending claims of the invention.

Claims

1. A method for obtaining the position of the black edge of automobile glass and measuring the light transmission area of ​​the glass, characterized in that: It includes the following steps: Apply the tape along the inner edge of the black side of the car glass (1) in a full circle; Using a developer, spraying it evenly on the surface of the automobile glass (2) and the adhesive tape; A plurality of randomly distributed positioning marks (3) are pasted on the surface of the automobile glass (2), and the positioning marks (3) avoid the adhesive tape; The adhesive tape is torn off from the inner edge (1) of the black side of the automobile glass, thereby leaving a glass area (4) on which the developer is not sprayed at the inner edge (1) of the black side of the automobile glass; A three-dimensional laser scan is performed on a car glass (2) having a glass area (4) on which a developer is not sprayed. During the scanning process, a car glass point cloud is generated according to each identified positioning mark (3). In the car glass point cloud, the glass area (4) on which a developer is not sprayed corresponds to a point cloud-free area, which is a black edge contour line of the car glass. In the car glass point cloud, a point cloud area inside the black edge contour line of the glass is a glass light-transmitting area, and the area of ​​the glass light-transmitting area is calculated according to the point cloud inside the black edge contour line of the glass.

2. The method for obtaining the position of the black edge of automobile glass and measuring the light transmission area of ​​the glass according to claim 1, characterized in that: The developer is sprayed on the surface of the automobile glass (2) and the adhesive tape to form a developer coating, and the developer coating completely covers the surface of the automobile glass (2) and the adhesive tape.

3. The method for obtaining the position of the black edge of automobile glass and measuring the light transmission area of ​​the glass according to claim 1, characterized in that: The developing coating can refract the laser during three-dimensional laser scanning.

4. The method for obtaining the position of the black edge of automobile glass and measuring the light transmission area of ​​the glass according to claim 1, characterized in that: The distance between two adjacent positioning marks (3) ranges from 15 to 20 cm. Positioning marks (3) need to be distributed in each area of ​​the glass, and the positioning marks (3) are randomly distributed in each area of ​​the glass.

5. The method for obtaining the position of the black edge of automobile glass and measuring the light transmission area of ​​the glass according to claim 1, characterized in that: When scanning the positioning marks, start from the center of the car glass, use the 3D laser scanner to scan to both sides of the car glass, and identify the positioning marks on the car glass through the lens of the 3D laser scanner.

6. The method for obtaining the position of the black edge of automobile glass and measuring the light transmission area of ​​the glass according to claim 1, characterized in that: In three-dimensional laser scanning, the glass surface sprayed with developer and the glass surface without developer have different refractive indices. The same laser power is irradiated on surfaces with different refractive indices to generate a point cloud of automobile glass with a point cloud-free area.

7. The method for obtaining the position of the black edge of automobile glass and measuring the light transmission area of ​​the glass according to claim 1, characterized in that: The specific method of calculating the area of ​​the glass light-transmitting area based on the point cloud inside the black edge contour of the glass is: The point cloud inside the black edge contour line of the glass is imported into the digital shape editor of the CATIA software, and the point cloud inside the black edge contour line of the glass is converted into a mesh surface to obtain the area of ​​the glass translucent region.

8. The method for obtaining the position of the black edge of automobile glass and measuring the light transmission area of ​​the glass according to claim 7, characterized in that: The digital shape editor converts the point cloud inside the black edge contour of the glass into corresponding triangular mesh surfaces, and adds up the areas of all triangular mesh surfaces to obtain the area of ​​the glass translucent area.

9. A system for obtaining the black edge position of automobile glass and measuring the light transmission area of ​​glass based on the method of claim 1, characterized in that: It includes a glass black edge position acquisition module and a glass light-transmitting area acquisition module; The glass black edge position acquisition module uses a three-dimensional laser scanner to perform three-dimensional laser scanning on the automobile glass (2) having a glass area (4) on which the developer is not sprayed, and generates an automobile glass point cloud according to each identified positioning mark (3) during the scanning process, wherein the glass area (4) on which the developer is not sprayed corresponds to a point cloud-free area in the automobile glass point cloud, and the point cloud-free area is the outline of the automobile glass black edge; The glass light-transmitting area acquisition module is used to calculate the area of ​​the glass light-transmitting area according to the point cloud inside the black edge contour line of the glass. The glass light-transmitting area is the point cloud area inside the black edge contour line of the glass in the point cloud of the automobile glass.

10. A computer program product, comprising a computer program, characterized in that The computer program implements the system of claim 9 when executed by a processor.

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