阅读说明：本技术 三维曲面瑕疵检测系统校正治具及使用其的校正方法 (Three-dimensional curved surface flaw detection system correction jig and correction method using same ) 是由 陈宗圣 魏源锺 许智钦 于 2019-08-28 设计创作，主要内容包括：本发明公开了一种三维曲面瑕疵检测系统校正治具,其至少包括：一框体,其至少一外侧表面上具有多个棋盘格。此外,本发明亦揭示一种使用三维曲面瑕疵检测系统校正治具的校正方法。(The invention discloses a three-dimensional curved surface flaw detection system correction jig, which at least comprises: a frame body, at least one outer surface of which is provided with a plurality of checkerboards. In addition, the invention also discloses a correction method for correcting the jig by using the three-dimensional curved surface flaw detection system.)

1. The utility model provides a three-dimensional curved surface flaw detection system corrects tool which characterized in that, it includes at least:

a frame body, at least one outer surface of which is provided with a plurality of checkerboards.

2. The calibration fixture for three-dimensional curved surface flaw detection system according to claim 1, wherein the outer surface further comprises an upper surface and a lower surface, and an included angle is formed between the upper surface and the lower surface.

3. The calibration fixture of claim 1, wherein the frame is a quadrilateral and is an intermediate metal frame.

4. The calibration fixture of claim 1, wherein the checkerboard has a uniform size.

5. A correction method for correcting a jig by using a three-dimensional curved surface flaw detection system is characterized by comprising the following steps of:

providing a three-dimensional curved surface flaw detection system correction jig, wherein at least one outer side surface of a frame body of the three-dimensional curved surface flaw detection system correction jig is provided with a plurality of checkerboards;

using a calibrated first image capture device to perform line scanning on a plurality of checkerboards on the at least one outer surface to obtain a first image file;

a second image capturing device to be corrected is used for carrying out line scanning on the plurality of checkerboards on the at least one outer side surface to obtain a second image file; and

and comparing the first image file with the second image file, and further adjusting the distance or angle between the second image capturing device and the three-dimensional curved surface flaw detection system correction jig so as to finish the correction of the second image capturing device.

6. The method of claim 5, wherein the outer surface further comprises an upper surface and a lower surface, and the upper surface and the lower surface form an included angle therebetween.

7. The method of claim 5, wherein the image capturing angles of the first and second image capturing devices are perpendicular to the outer surface.

8. The method of claim 5, wherein the first image capturing device and the second image capturing device are a lens, a camera or a camera.

9. The method of claim 5, wherein the three-dimensional curved surface defect detection system calibration fixture is a mobile phone middle metal frame.

10. The method of claim 5, wherein the three-dimensional curved surface defect inspection system calibration fixture is a quadrilateral.

Technical Field

The present invention relates to a calibration jig for a three-dimensional curved surface defect detection system and a calibration method using the same, and more particularly, to a calibration jig for a three-dimensional curved surface defect detection system having a plurality of checkerboards on at least one outer surface of a frame and a calibration method using the same.

Background

Since the introduction of the first generation of smart phones (iphones) by apple inc in 2007, smart phones have deeply affected the lives of everyone. According to data statistics, the sale of the global smart phone in 2018 reaches nearly 15 hundred million.

Generally, a smart phone has a frame, which may be damaged by collision or falling during transportation or assembly, and therefore, the surface of the frame is detected during production or before shipment to ensure that the surface of the frame is not scratched or damaged. The outer shape of a general plane object can be detected and corrected by a glass or acrylic transparent correction plate, but a detection system of the three-dimensional frame, particularly a three-dimensional middle metal frame, needs to be additionally designed so as to be convenient for detecting the surface of the three-dimensional middle metal frame in the production process and ensure the quality of products.

For example, taiwan patent of invention I616715 discloses a method and a system for adjusting a multi-lens module, which is suitable for adjusting a multi-lens module at least including a first lens and a second lens before shipping, and comprises the following steps: shooting a corrected object by using the first lens and the second lens so as to generate a first group of correction parameters corresponding to the first lens and a second group of correction parameters corresponding to the second lens, wherein the first group of correction parameters comprises internal parameters and external parameters of the first lens, the second group of correction parameters comprises internal parameters and external parameters of the second lens, and the external parameters of the first lens and the external parameters of the second lens are associated with a common reference coordinate system; shooting a target object by using the first lens and the second lens, and processing images of the target object respectively shot by the first lens and the second lens by using the first group of correction parameters and the second group of correction parameters to generate corrected images; and adjusting and aligning the first lens and the second lens according to the corrected image.

For another example, taiwan patent I552598 discloses an automatic correction system and an automatic correction method for a camera, which utilizes a fixed-position correction board to calculate a correction parameter of the camera, the camera has at least one image sensing unit, and the camera is disposed on a testing device, the automatic correction method comprises: the testing device rotates the camera by taking a first shaft and a second shaft which are different as rotating axes, and changes the angle of the at least one image sensing unit of the camera facing the correcting plate; the camera captures a plurality of images covering the correcting plate in the rotating process; calculating the correction parameters of the camera according to the images; and storing the calibration parameter.

For example, CN201110342068.4 application of the present invention, "a cross point identification algorithm of checkerboard", discloses a cross point identification algorithm of checkerboard, which is based on a detection method using the principle that the gradient at the corner point of the checkerboard is the local minimum, and uses the difference between the minimum gradient of the pixel point and the mean of the local area to avoid the influence of the uneven illumination of the image on the binarization of the image, and uses the symmetry of the corner point to remove the influence of the noise point.

However, although the above-mentioned prior patents disclose the related art using checkerboard as the adjusting method of the camera, the checkerboard is not used for detecting the frame surface of the smart phone, which is a serious disadvantage in the art.

In view of the above-mentioned shortcomings in the prior art, the present invention provides a calibration tool for a three-dimensional curved surface flaw detection system and a calibration method using the same, so as to improve the above-mentioned shortcomings.

Disclosure of Invention

An object of the present invention is to provide a three-dimensional curved surface defect detecting system calibration jig, wherein at least one outer surface of the frame body has a plurality of checkerboards, so that the shape of the three-dimensional curved surface defect detecting system calibration jig can be more consistent when an image capturing device is used to detect the shape of the three-dimensional curved surface defect detecting system calibration jig.

One objective of the present invention is to provide a three-dimensional curved surface flaw detection system calibration jig, which at least includes: a frame body, at least one outer surface of which is provided with a plurality of checkerboards.

The outer surface further comprises an upper outer surface and a lower outer surface, and an included angle is formed between the upper surface and the lower surface.

Wherein, the frame body is a quadrangle and is a middle metal frame body.

Wherein the checkerboard is of uniform size.

Another objective of the present invention is to provide a calibration method using a three-dimensional curved surface defect detection system, which uses a calibrated first image capturing device to calibrate at least a second image capturing device to be calibrated, so as to improve the efficiency.

To achieve the above object, the present invention provides a calibration method using a three-dimensional curved surface defect detection system to calibrate a fixture, comprising the following steps: providing a three-dimensional curved surface flaw detection system correction jig, wherein at least one outer side surface of a frame body of the three-dimensional curved surface flaw detection system correction jig is provided with a plurality of checkerboards; using a calibrated first image capture device to perform line scanning on a plurality of checkerboards on the at least one outer surface to obtain a first image file; a second image capturing device to be corrected is used for carrying out line scanning on the plurality of checkerboards on the at least one outer side surface to obtain a second image file; and comparing the first image file with the second image file, and adjusting the distance or angle between the second image capturing device and the three-dimensional curved surface flaw detection system correction jig according to the comparison result to finish the correction of the second image capturing device.

The outer surface further comprises an upper surface and a lower surface, and an included angle is formed between the upper surface and the lower surface.

The image capturing angles of the first image capturing device and the second image capturing device are perpendicular to the outer side surface.

The first image capturing device and the second image capturing device are a lens, a video camera or a camera.

The three-dimensional curved surface flaw detection system correction jig is a mobile phone middle metal frame.

Wherein, the three-dimensional curved surface flaw detection system correction jig is a quadrangle.

To further clarify the structure and features of the present invention and its objects, a more particular description of the invention will be rendered by reference to the appended drawings, which are illustrated in the appended drawings.

Drawings

Fig. 1a is a schematic view illustrating a three-dimensional curved surface defect detecting system correcting jig according to a preferred embodiment of the invention.

Fig. 1b is a schematic diagram illustrating a partially enlarged view of a frame of a calibration fixture of a three-dimensional curved surface defect detection system according to a preferred embodiment of the invention.

Fig. 2 is a schematic view illustrating a flow chart of a calibration method using a three-dimensional curved surface defect detection system to calibrate a fixture according to another preferred embodiment of the invention.

Fig. 3a is a schematic diagram illustrating a first image capturing device having been calibrated to perform line scanning on a plurality of checkerboards on at least one outer surface of the three-dimensional curved surface defect detecting system calibration jig according to another preferred embodiment of the present invention.

Fig. 3b is a schematic view illustrating a second image capturing device to be calibrated performing line scanning on a plurality of checkerboards on at least one outer surface of the calibration fixture of the three-dimensional curved surface defect detecting system according to another preferred embodiment of the invention.

Detailed Description

Referring to fig. 1a to fig. 1b, wherein fig. 1a is a schematic perspective view illustrating a calibration fixture of a three-dimensional curved surface flaw detection system according to a preferred embodiment of the invention; fig. 1b is a partially enlarged schematic view illustrating a frame of a three-dimensional curved surface defect detecting system correcting jig according to a preferred embodiment of the invention.

As shown in the drawings, the three-dimensional curved surface flaw detection system calibration jig 1 according to a preferred embodiment of the present invention at least includes: a frame 10, at least one outer surface 11 of the frame 10 has a plurality of checkerboards 15. The checkerboard 15 used in the present invention is a standard checkerboard, which is a checkerboard with black and white phases, and each checkerboard has a uniform size, such as but not limited to 1 mm-1 cm, in the present embodiment, the size of each checkerboard is exemplified by 1mm, but not limited thereto, and the size of each checkerboard corresponds to a fixed pixel (pixel), and the pixel value is related to a pixel of an image capturing device, in the present embodiment, the size of each checkerboard is exemplified by 10 pixels, but not limited thereto. In addition, in the present embodiment, the four outer side surfaces 11 of the frame 10 have a plurality of checkerboard cells 15, but the present invention is not limited thereto.

The frame 10 is, for example, but not limited to, a quadrilateral, and the frame 10 is preferably a metal frame.

In addition, the outer surface 11 further includes an upper surface 111 and a lower surface 112, and an included angle is formed between the upper surface and the lower surface. The included angle is preferably an angle <45 °.

Therefore, when the appearance of the three-dimensional curved surface defect detection system correction jig 1 is detected by an image capturing device, whether the surface is flat and consistent can be quickly detected, the production efficiency can be improved, and the product quality can be ensured.

Referring to fig. 2 to fig. 3b, fig. 2 is a schematic flow chart illustrating a calibration method using a three-dimensional curved surface defect detection system to calibrate a fixture according to another preferred embodiment of the invention; FIG. 3a is a schematic diagram of a calibrated first image capturing device performing line scanning on a plurality of checkerboards on at least one outer surface of the three-dimensional curved surface defect detecting system calibration jig according to another preferred embodiment of the present invention; fig. 3b is a schematic diagram illustrating a second image capturing device to be corrected performing line scanning on a plurality of checkerboards on at least one outer surface of the three-dimensional curved surface defect detecting system correcting jig according to another preferred embodiment of the invention.

As shown in the drawings, the calibration method using the three-dimensional curved surface defect detection system according to another preferred embodiment of the present invention includes the following steps: providing a three-dimensional curved surface defect detection system correction tool 1, wherein at least one outer side surface 11 of a frame body of the correction tool is provided with a plurality of checkerboards 15 (step 1); using a calibrated first image capturing device 20 to perform line scanning on the plurality of checkerboards 15 on the at least one outer surface 11 to obtain a first image file (step 2); performing a line scan on the plurality of checkerboards 15 on the at least one outer surface 11 by a second image capturing device 30 to be corrected to obtain a second image file (step 3); and comparing the first image file and the second image file to adjust the distance or angle between the second image capturing device 30 and the three-dimensional curved surface defect detecting system correcting tool 1, so as to complete the correction of the second image capturing device (step 4).

In the step 1, a three-dimensional curved surface defect detection system calibration jig 1 is provided, wherein at least one outer side surface 11 of a frame body 10 of the three-dimensional curved surface defect detection system calibration jig is provided with a plurality of checkerboards 15; the frame 10 is, for example but not limited to, a quadrilateral, and the frame 10 is preferably a metal frame. In the present embodiment, the frame 10 has a plurality of checkerboards 15 on all four outer surfaces 11, but not limited thereto.

The checkerboard 15 used in the present invention is a standard checkerboard, which is a checkerboard with black and white alternating, and each checkerboard has a uniform size, and is, for example, but not limited to, 1mm to 1cm, in the present embodiment, 1mm is taken as an example, but not limited thereto, and the size of each checkerboard corresponds to a fixed pixel (pixel), and the pixel value is related to a pixel of an image capturing device, in the present embodiment, the size of each checkerboard is taken as an example, but not limited thereto, to correspond to 10 pixels.

In addition, the outer surface 11 further includes an upper surface 111 and a lower surface 112, and an included angle is formed between the upper surface and the lower surface. And the included angle is preferably ≦ 45 °.

In step 2, a first image file is obtained after a line scan is performed on the plurality of checkerboards 15 on the at least one outer surface 11 by a calibrated first image capturing device 20. The first image capturing device 20 is, for example but not limited to, a lens, a camera or a camera, and the first image capturing device 20 is disposed above or below the three-dimensional curved surface defect detecting system calibration jig 1, and the image capturing angle thereof is, for example but not limited to, perpendicular to the upper surface 111 and then perpendicular to the lower surface 112. In this embodiment, the first image capturing device 20 is first fixed above the side to make the image capturing angle perpendicular to the upper surface 111, and the three-dimensional curved surface defect detecting system calibration jig 1 is rotated for one turn to make the first image capturing device 20 perform line scanning on the checkerboards 15 on the four upper surfaces 111; then, the first image capturing device 20 is fixed to the lateral lower side, so that the image capturing angle is perpendicular to the lower surface 112, and the three-dimensional curved surface defect detecting system calibration jig 1 is rotated for one turn, so that the first image capturing device 20 performs line scanning on the checkerboards 15 on the four lower surfaces 112, and a first image file is obtained after merging. If the outer surface 11 is a plane (i.e. the upper surface 111 and the lower surface 112 do not have the included angle therebetween, the first image capturing device 20 only needs to perform one line scan to obtain the first image file).

In step 3, a second image capturing device 30 to be calibrated performs a line scan on the plurality of checkerboards 15 on the at least one outer surface 11 to obtain a second image file. The second image capturing device 30 is, for example but not limited to, a lens, a camera or a camera, and the second image capturing device 30 is disposed above the three-dimensional curved surface defect detecting system calibration jig 1, and the image capturing angle thereof is, for example but not limited to, perpendicular to the upper surface 111. In this embodiment, the second image capturing device 30 is also fixed above the three-dimensional curved surface defect detecting system calibration jig 1, so that the image capturing angle is perpendicular to the upper surface 111, and the three-dimensional curved surface defect detecting system calibration jig 1 is rotated for one turn, so that the second image capturing device 30 performs line scanning on the checkerboards 15 on the four upper surfaces 111; then, the second image capturing device 30 is fixed under the side to make the image capturing angle perpendicular to the lower surface 112, and the three-dimensional curved surface defect detecting system calibration jig 1 is rotated for one turn to make the second image capturing device 30 perform line scanning on the checkerboards 15 on the four lower surfaces 112, and a second image file is obtained after merging. If the outer surface 11 is a plane (i.e. the upper surface 111 and the lower surface 112 do not have the included angle therebetween, the second image capturing device 30 only needs to perform one line scan to obtain the second image file).

In the step 4, the first image file and the second image file are compared, so as to adjust the distance or angle between the second image capturing device 30 and the three-dimensional curved surface flaw detection system calibration jig 1, thereby completing the calibration of the second image capturing device.

As described above, since the size of each checkerboard corresponds to 10 pixels, when the second image file is detected, if the size of the checkerboard corresponds to 11 pixels (or more), it indicates that the distance between the second image capturing device 30 and the three-dimensional curved surface defect detecting system calibration jig 1 is too far, and therefore, the distance needs to be adjusted closer, and steps 3-4 are repeated until the size of the checkerboard corresponds to 10 pixels, thereby completing the calibration of the second image capturing device 30.

On the contrary, if the size of the checkerboard corresponds to 9 pixels (or less), it means that the distance between the second image capturing device 30 and the three-dimensional curved surface defect detecting system calibration jig 1 is too close, and therefore, the distance needs to be adjusted far, and steps 3-4 are repeated until the size of the checkerboard corresponds to 10 pixels, thereby completing the calibration of the second image capturing device 30.

In addition, if the size of the checkerboard corresponds to 10 pixels, but the shape of each pixel is not perfect circle, then the angle of the second image capturing device 30 needs to be fine-tuned, and steps 3-4 are repeated until the shape of each pixel in the checkerboard is perfect circle, so as to complete the calibration of the second image capturing device 30.

In summary, the calibration jig of the three-dimensional curved surface defect detection system and the calibration method thereof of the present invention have the following advantages: 1. the outer surface of at least one outer side of the frame body is provided with a plurality of chessboard grids, so that the shapes of the three-dimensional curved surface defect detection system correction jig can be more consistent when the shape of the three-dimensional curved surface defect detection system correction jig is detected by an image capturing device; and 2, the first image capturing device which is calibrated is used for calibrating at least one second image capturing device to be calibrated so as to improve the efficiency of the first image capturing device and ensure the consistency of the first image capturing device and the second image capturing device.

The present invention is disclosed in the preferred embodiments, and it is apparent to those skilled in the art that the present invention can be modified or modified in some ways without departing from the scope of the present invention.