CN113777110A - Product glass surface flaw detection device and detection method - Google Patents
Product glass surface flaw detection device and detection method Download PDFInfo
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- CN113777110A CN113777110A CN202111151916.3A CN202111151916A CN113777110A CN 113777110 A CN113777110 A CN 113777110A CN 202111151916 A CN202111151916 A CN 202111151916A CN 113777110 A CN113777110 A CN 113777110A
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- 239000011521 glass Substances 0.000 title claims abstract description 74
- 238000001514 detection method Methods 0.000 title claims abstract description 25
- 238000000034 method Methods 0.000 claims abstract description 16
- 230000007547 defect Effects 0.000 claims description 10
- 230000007246 mechanism Effects 0.000 claims description 7
- 230000000694 effects Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 241001268993 Heterochrosis Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000007373 indentation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/8806—Specially adapted optical and illumination features
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
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- Pathology (AREA)
- Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)
Abstract
The application provides a product glass surface flaw detection device and a detection method, wherein the method comprises the following steps: taking a picture of the product glass surface for the first time from a first angle, wherein an included angle between the first angle and the product glass surface is more than 0 degree and less than 90 degrees; rotating the product by a second angle around a rotating shaft, wherein the rotating shaft is vertical to the glass surface of the product; taking a second photograph of the glass surface of the product from the first angle; and identifying flaws on the glass surface of the product according to the images obtained by the first photographing and the second photographing. This application is through rotating the product to twice shoot from first angle, shoot the image that obtains according to twice and carry out the flaw and discern, can overcome the problem that the flaw is not obvious under certain angle effectively, thereby improved and detected the precision.
Description
Technical Field
The invention relates to a machine vision detection technology, in particular to a device and a method for detecting defects of a product glass surface.
Background
Increasingly, flaw detection on the surface of a product is performed by using machine vision, and the working process of the flaw detection is generally as follows: the product passes through the camera, the camera shoots to obtain a surface image of the product, and flaws in the image are detected. In order to detect defects of different types of defects, the conventional high-speed linear array camera is usually matched with a plurality of different light sources to take pictures for a plurality of times and generate a plurality of images so as to obtain the best display effect of various defects.
Disclosure of Invention
The inventor finds that defects such as heterochrosis, black spots, scratches and indentations on the glass surface of a product have directionality, are very unobvious under certain angles, and even if a light source is replaced, the defects are still difficult to accurately detect by the conventional detection device. Therefore, the present invention is directed to a device and a method for detecting defects on a glass surface of a product, so as to solve the problem.
The following presents a simplified summary of one or more aspects in order to provide a basic understanding of such aspects. This summary is not an extensive overview of all contemplated aspects, and is intended to neither identify key or critical elements of all aspects nor delineate the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form as a prelude to the more detailed description that is presented later.
According to one aspect of the invention, a method for detecting defects of a glass surface of a product is provided, which comprises the following steps:
taking a picture of the product glass surface for the first time from a first angle, wherein an included angle between the first angle and the product glass surface is more than 0 degree and less than 90 degrees;
rotating the product by a second angle around a rotating shaft, wherein the rotating shaft is vertical to the glass surface of the product;
taking a second photograph of the glass surface of the product from the first angle;
and identifying flaws on the glass surface of the product according to the images obtained by the first photographing and the second photographing.
In one embodiment, the method specifically includes:
driving a product to move along a first direction, and carrying out first linear scanning photographing on the glass surface of the product from a first angle by a linear array camera, wherein the included angle between the first angle and the glass surface of the product is larger than 0 degree and smaller than 90 degrees;
driving the product to rotate a second angle around a rotating shaft, wherein the rotating shaft is vertical to the glass surface of the product;
driving the product to move along the first direction again, and carrying out secondary line scanning photographing on the glass surface of the product from the first angle by the linear array camera;
and identifying flaws on the glass surface of the product according to the images obtained by the first linear scanning photographing and the second linear scanning photographing.
In an embodiment, an included angle between the first angle and the rotating shaft is 15-75 °.
In an embodiment, the second angle is 90 °.
According to another aspect of the present invention, there is provided a product glass surface flaw detection apparatus comprising:
the camera is used for carrying out primary photographing and secondary photographing on the product glass surface from a first angle, and an included angle between the first angle and the product glass surface is larger than 0 degree and smaller than 90 degrees;
and the driving mechanism is used for rotating the product by a second angle around a rotating shaft, and the rotating shaft is vertical to the glass surface of the product.
In an embodiment, the camera is a line camera.
In one embodiment, the driving mechanism comprises a moving platform, a rotating platform and a product fixing component, wherein the moving platform drives the rotating platform to move, the rotating platform drives the product fixing component to rotate, and the product fixing component fixes a product.
In one embodiment, the apparatus further comprises a light source that illuminates the product glass face from a third angle that is equal to the angle between the first angle and the product glass face.
In an embodiment, the device further comprises a camera fixing component, the camera fixing component comprises a fixing seat, a first movable seat and a second movable seat, the camera and the light source are respectively installed on the first movable seat and the second movable seat, arc grooves are symmetrically formed in the fixing seat, and the first movable seat and the second movable seat are respectively clamped with the arc grooves.
In an embodiment, the arc groove includes an inner arc groove and an outer arc groove which are coaxially arranged, the first movable seat and the second movable seat are clamped with the inner arc groove and the outer arc groove by means of rollers, and the first movable seat and the second movable seat are fixedly connected with the fixed seat by means of bolts.
The embodiment of the invention has the beneficial effects that: by rotating the product, taking pictures twice from the same angle and recognizing the flaws according to the images obtained by taking pictures twice, the problem that the flaws are not obvious at a certain angle can be effectively solved, and the detection precision is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
The above features and advantages of the present disclosure will be better understood upon reading the detailed description of embodiments of the disclosure in conjunction with the following drawings. In the drawings, components are not necessarily drawn to scale, and components having similar relative characteristics or features may have the same or similar reference numerals.
FIG. 1 is a flow chart of an embodiment of the method of the present application;
FIG. 2 is a flow chart of another method embodiment of the present application;
FIG. 3 is a schematic perspective view of an embodiment of the apparatus of the present application;
FIG. 4 is a schematic perspective view of another embodiment of the apparatus of the present application;
FIG. 5 is a side view of an embodiment of the apparatus of the present application;
wherein: 310-a camera; 320-a drive mechanism; 330-a light source; 340-a camera fixed component; 321-X axis; 322-Y axis; 323-Z axis; 324-a rotating electrical machine; 325-a suction cup component; 341-fixed seat; 342-a first movable seat; 343-a second movable seat; 344 a-inner arc groove; 344 b-outer arc groove.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments. It is noted that the aspects described below in connection with the figures and the specific embodiments are only exemplary and should not be construed as imposing any limitation on the scope of the present invention.
As shown in fig. 1, the present embodiment provides a method for detecting a product glass surface flaw, which includes the following steps:
101, taking a picture of a product glass surface for the first time from a first angle, wherein an included angle between the first angle and the product glass surface is larger than 0 degree and smaller than 90 degrees;
102, rotating the product by a second angle around a rotating shaft, wherein the rotating shaft is vertical to the glass surface of the product;
103, taking a second photograph of the glass surface of the product from the first angle;
and 104, identifying flaws on the glass surface of the product according to the images obtained by the first photographing and the second photographing.
Taking a scratch as an example, when a camera shoots from a certain angle, the scratch may be very inconspicuous, so that the angle needs to be changed for the second shooting. The existing detection device is usually perpendicular to the surface of a product to take a picture, and at the moment, the picture is still difficult to be clearly taken even if the product is rotated for a certain angle. In the method, the camera and the product are not vertical, but inclined shooting is carried out, and the product can be inclined shooting again from another direction by rotating the product on the basis, so that the problem that flaws are not obvious at a certain angle can be effectively solved.
In order to obtain the best photographing effect, the included angle α between the first angle and the rotating shaft a is preferably 15 ° to 75 °. Further, in order to maximize the distinction between the first and second photographing, the second angle of rotation of the product may be 90 °.
Preferably, in order to obtain images with higher accuracy, a line camera may be used for taking pictures, which also requires the product to move relative to the line camera. At this time, as shown in fig. 2, the method includes the following steps:
and step 204, identifying flaws on the glass surface of the product according to the images obtained by the first linear scanning photographing and the second linear scanning photographing.
It should be noted that the movement of the product in the first direction may be a translational movement or may be another type of movement. For example, when the glass surface of the product is spherical, driving the product in the first direction may also be rotating the product.
In order to implement the method, an embodiment of the present application further provides a product glass surface flaw detection apparatus, as shown in fig. 3 to 5, the apparatus includes:
the camera 310 is used for taking a first picture and a second picture of the glass surface (the lower surface of the product in the figure) of the product from a first angle;
and a driving mechanism 320 for rotating the product by a second angle around a rotating shaft, wherein the rotating shaft is vertical to the glass surface of the product.
The camera 310 may be a high speed camera, a line camera, an area camera, or the like. In the present embodiment, the camera 310 is a line camera.
The driving mechanism 320 comprises a moving platform, a rotating platform and a product fixing component, wherein the moving platform drives the rotating platform to move, the rotating platform drives the product fixing component to rotate, and the product fixing component fixes the product.
In this embodiment, the motion platform is a three-axis platform, so that the product can be carried along the first direction in addition to the driving of the product. As shown in fig. 2, the three-axis platform includes an X-axis 321, a Y-axis 322, and a Z-axis 323, wherein the Y-axis is a first direction of the product movement. The rotary platform comprises a rotary motor 324, the product fixing component is a sucker component 325, and a rotary motor 342 is connected with the sucker component 325 through a connecting piece in the vertical direction, so that the rotating shaft is ensured to be vertical to the glass surface of the product.
Further, the apparatus further includes a light source 330, the light source 330 irradiates the product glass surface from a third angle, as shown in fig. 5, an included angle α between the third angle and the rotation axis a is equal to an included angle γ between the first angle and the rotation axis a, so that the light emitted from the light source 330 is reflected by the product glass surface to reach the camera 310. In this embodiment, the light source 330 is a linear light source in order to be adapted to the line camera.
In order to adjust the first angle and the third angle to detect a plurality of different types of defects, the apparatus further includes a camera fixing assembly 340, which includes a fixed base 341, a first movable base 342, and a second movable base 343. The camera 310 and the light source 330 are respectively installed on the first movable seat 342 and the second movable seat 343, arc grooves are symmetrically formed in the fixed seat 341, and the first movable seat 342 and the second movable seat 343 are respectively clamped with the arc grooves, so that the first movable seat 342 and the second movable seat 343 can rotate along the arc grooves.
Before detection, the first angle and the third angle need to be tested in advance, the first movable seat 342 and the second movable seat 343 are fixed by bolts after a proper angle is found, and then subsequent photographing test is performed.
In order to ensure that the camera 310 and the light source 330 are always aligned at the same point, the circular arc grooves may be designed to include an inner circular arc groove 344a and an outer circular arc groove 344b which are coaxially disposed, and the first movable base 342 and the second movable base 343 are engaged with the inner circular arc groove 344a and the outer circular arc groove 344b by means of rollers. Due to the restriction of the inner arc groove 344a and the outer arc groove 344b, the first movable base 342 and the second movable base 343 perform pointer-type movements around the center of the circle.
The working process of the device is briefly described as follows:
1) the suction cup assembly 325 sucks the product from the pick level, and the product is first carried by the three-axis platform to a photographing position, which is located on the side of the intersection of the camera 310 and the light source 320.
2) The Y-axis 322 drives the product to move along the Y-axis direction, and the linear array camera scans the glass surface of the product line by line until an image of the whole glass surface is obtained.
3) The rotary motor 342 rotates the chuck assembly 325 by 90 (both forward and reverse).
4) The Y-axis 322 drives the product to move along the Y-axis direction, and the linear array camera takes a second picture of the glass surface of the product.
5) And after the two times of photographing are finished, the three-axis platform puts the product back to the material taking position.
In summary, the detection device and the detection method provided by the application can more accurately identify the flaws on the glass surface by driving the product to change the angle for taking a picture twice; through setting up the fixed subassembly of camera with adjustable angle, can adjust the angle of shooing as required, be applicable to the detection of multiple flaw.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The previous description of the disclosure is provided to enable any person skilled in the art to make or use the disclosure. Various modifications to the disclosure will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other variations without departing from the spirit or scope of the disclosure. Thus, the disclosure is not intended to be limited to the examples and designs described herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
The above description is only a preferred example of the present application and should not be taken as limiting the present application, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present application should be included in the scope of the present application.
Claims (10)
1. A method for detecting defects of a glass surface of a product is characterized by comprising the following steps:
taking a picture of the product glass surface for the first time from a first angle, wherein an included angle between the first angle and the product glass surface is more than 0 degree and less than 90 degrees;
rotating the product by a second angle around a rotating shaft, wherein the rotating shaft is vertical to the glass surface of the product;
taking a second photograph of the glass surface of the product from the first angle;
and identifying flaws on the glass surface of the product according to the images obtained by the first photographing and the second photographing.
2. The method for detecting the product glass surface flaws of claim 1, specifically comprising: driving a product to move along a first direction, and carrying out first linear scanning photographing on the glass surface of the product from a first angle by a linear array camera, wherein the included angle between the first angle and the glass surface of the product is larger than 0 degree and smaller than 90 degrees;
driving the product to rotate a second angle around a rotating shaft, wherein the rotating shaft is vertical to the glass surface of the product;
driving the product to move along the first direction again, and carrying out secondary line scanning photographing on the glass surface of the product from the first angle by the linear array camera;
and identifying flaws on the glass surface of the product according to the images obtained by the first linear scanning photographing and the second linear scanning photographing.
3. The method of claim 1, wherein an angle between the first angle and the glass surface of the product is between 15 ° and 75 °.
4. The product glass face flaw detection method of claim 1 in which the second angle is 90 °.
5. The utility model provides a product glass face flaw detection device which characterized in that includes:
the camera is used for carrying out primary photographing and secondary photographing on the product glass surface from a first angle, and an included angle between the first angle and the product glass surface is larger than 0 degree and smaller than 90 degrees;
and the driving mechanism is used for rotating the product by a second angle around a rotating shaft, and the rotating shaft is vertical to the glass surface of the product.
6. The product glass surface flaw detection apparatus of claim 5 wherein the camera is a line camera.
7. The product glass surface flaw detection device of claim 6 wherein the drive mechanism includes a motion platform, a rotation platform and a product fixing assembly, the motion platform drives the rotation platform to move, the rotation platform drives the product fixing assembly to rotate, and the product fixing assembly fixes the product.
8. The product glass face flaw detection device of claim 5 further comprising a light source that illuminates the product glass face from a third angle equal to the first angle.
9. The product glass surface flaw detection device of claim 8, further comprising a camera fixing assembly, wherein the camera fixing assembly comprises a fixed seat, a first movable seat and a second movable seat, the camera and the light source are respectively installed on the first movable seat and the second movable seat, the fixed seat is symmetrically provided with arc grooves, and the first movable seat and the second movable seat are respectively clamped with the arc grooves.
10. The product glass surface flaw detection device according to claim 9, wherein the arc grooves include an inner arc groove and an outer arc groove which are coaxially arranged, the first movable seat and the second movable seat are clamped with the inner arc groove and the outer arc groove by means of rollers, and the first movable seat and the second movable seat are fixedly connected with the fixed seat by means of bolts.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111151916.3A CN113777110B (en) | 2021-09-29 | 2021-09-29 | Device and method for detecting flaws on glass surface of product |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111151916.3A CN113777110B (en) | 2021-09-29 | 2021-09-29 | Device and method for detecting flaws on glass surface of product |
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| CN113777110A true CN113777110A (en) | 2021-12-10 |
| CN113777110B CN113777110B (en) | 2024-07-09 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114608459A (en) * | 2022-03-08 | 2022-06-10 | 江苏泗阳协力轻工机械有限公司 | Glass manages check out test set |
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| JP2005300382A (en) * | 2004-04-13 | 2005-10-27 | Shin Etsu Chem Co Ltd | Inspection device for micro-flaw of sheet transparent material or sheet reflecting material and microflaw inspection method |
| CN201750491U (en) * | 2010-04-30 | 2011-02-16 | 常州联力自动化科技有限公司 | Adjusting device of video camera |
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| CN112964727A (en) * | 2021-02-07 | 2021-06-15 | 厦门威芯泰科技有限公司 | Surface defect developing device and surface defect detecting apparatus |
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2021
- 2021-09-29 CN CN202111151916.3A patent/CN113777110B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998010268A1 (en) * | 1996-09-05 | 1998-03-12 | Wea Manufacturing, Inc. | Glass master surface inspector |
| JP2005300382A (en) * | 2004-04-13 | 2005-10-27 | Shin Etsu Chem Co Ltd | Inspection device for micro-flaw of sheet transparent material or sheet reflecting material and microflaw inspection method |
| CN201750491U (en) * | 2010-04-30 | 2011-02-16 | 常州联力自动化科技有限公司 | Adjusting device of video camera |
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| CN111077168A (en) * | 2019-12-30 | 2020-04-28 | 彩虹显示器件股份有限公司 | Device and method for spot inspection of plate glass flaws |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114608459A (en) * | 2022-03-08 | 2022-06-10 | 江苏泗阳协力轻工机械有限公司 | Glass manages check out test set |
| CN114608459B (en) * | 2022-03-08 | 2024-05-07 | 江苏泗阳协力轻工机械有限公司 | Glass tube detection equipment |
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