CN113777110B - Device and method for detecting flaws on glass surface of product - Google Patents
Device and method for detecting flaws on glass surface of product Download PDFInfo
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- CN113777110B CN113777110B CN202111151916.3A CN202111151916A CN113777110B CN 113777110 B CN113777110 B CN 113777110B CN 202111151916 A CN202111151916 A CN 202111151916A CN 113777110 B CN113777110 B CN 113777110B
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- 239000011521 glass Substances 0.000 title claims abstract description 57
- 238000000034 method Methods 0.000 title abstract description 16
- 230000007246 mechanism Effects 0.000 claims description 7
- 238000001514 detection method Methods 0.000 abstract description 10
- 230000007547 defect Effects 0.000 description 9
- 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
- 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
Classifications
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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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- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
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- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)
Abstract
The application provides a device and a method for detecting flaws on a glass surface of a product, wherein the method comprises the following steps: photographing the glass surface of the product for the first time from a first angle, wherein the included angle between the first angle and the glass surface of the product is larger than 0 degrees and smaller than 90 degrees; rotating the product by a second angle around a rotating shaft, wherein the rotating shaft is perpendicular to the glass surface of the product; photographing the glass surface of the product for the second time 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. According to the application, by rotating the product and photographing twice from the first angle and carrying out flaw identification according to the images obtained by photographing twice, the problem that flaws are not obvious under a certain angle can be effectively overcome, so that the detection precision is improved.
Description
Technical Field
The invention relates to a machine vision detection technology, in particular to a device and a method for detecting flaws on a glass surface of a product.
Background
Flaw detection on the surface of a product is increasingly performed by using machine vision, and the working process is generally as follows: the product passes in front of the camera, the camera shoots to obtain a product surface image, and flaws in the image are detected. In order to detect different types of defects, the existing high-speed linear array camera is usually matched with a plurality of different light sources to take photos for many 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 heterochromatic, black spots, scratches, indentations and the like on the glass surface of the product have directionality, and the defects are quite unobvious under certain angles, so that even if a light source is replaced, the defects still cannot be detected accurately by the existing detection device. Accordingly, an object of the present invention is to provide 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 an aspect of the present invention, there is provided a method for detecting defects on a glass surface of a product, comprising:
photographing the glass surface of the product for the first time from a first angle, wherein the included angle between the first angle and the glass surface of the product is larger than 0 degrees and smaller than 90 degrees;
Rotating the product by a second angle around a rotating shaft, wherein the rotating shaft is perpendicular to the glass surface of the product;
Photographing the glass surface of the product for the second time 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 performing first linear scanning photographing on the glass surface of the product from a first angle by using a linear array camera, wherein an included angle between the first angle and the glass surface of the product is larger than 0 degrees and smaller than 90 degrees;
driving the product to rotate a second angle around a rotating shaft, wherein the rotating shaft is perpendicular to the glass surface of the product;
Driving the product to move along the first direction again, and performing second linear scanning photographing on the glass surface of the product from a first angle by using the linear array camera;
and identifying flaws on the glass surface of the product according to the images obtained by the first line scanning photographing and the second line scanning photographing.
In an embodiment, the included angle between the first angle and the rotating shaft is 15 ° to 75 °.
In one embodiment, the second angle is 90 °.
According to another aspect of the present invention, there is provided a device for detecting flaws on a glass surface of a product, comprising:
The camera is used for carrying out first photographing and second photographing on the glass surface of the product from a first angle, and the included angle between the first angle and the glass surface of the product is larger than 0 degrees 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 perpendicular to the glass surface of the product.
In an embodiment, the camera is a line camera.
In an embodiment, the driving mechanism comprises a moving platform, a rotating platform and a product fixing assembly, wherein the moving platform drives the rotating platform to move, the rotating platform drives the product fixing assembly to rotate, and the product fixing assembly is used for fixing a product.
In one embodiment, the apparatus further comprises a light source that irradiates the product glass surface from a third angle, the third angle being equal to the angle between the first angle and the product glass surface.
In an embodiment, the device further comprises a camera fixing assembly, the camera fixing assembly 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, circular arc grooves are symmetrically formed in the fixing seat, and the first movable seat and the second movable seat are respectively connected with the circular arc grooves in a clamping mode.
In an embodiment, the circular arc groove comprises an inner circular arc groove and an outer circular arc groove which are coaxially arranged, the first movable seat and the second movable seat are connected with the inner circular arc groove and the outer circular arc groove in a clamping mode by virtue of idler wheels, and the first movable seat and the second movable seat are fixedly connected with the fixing seat by virtue of bolts.
The embodiment of the invention has the beneficial effects that: by rotating the product and photographing twice from the same angle, flaw identification is carried out according to images obtained by photographing twice, the problem that flaws are not obvious under a certain angle can be effectively solved, and therefore detection accuracy is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
The above features and advantages of the present invention will be better understood after reading the detailed description of embodiments of the present disclosure in conjunction with the following drawings. In the drawings, the components are not necessarily to scale and components having similar related features or characteristics 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-camera; 320-a drive mechanism; 330-a light source; 340-a camera securing assembly; 321-X axis; 322-Y axis; 323-Z axis; 324-rotating electric machine; 325-a suction cup assembly; 341-fixing seat; 342-a first movable seat; 343-a second movable seat; 344 a-inner circular arc grooves; 344 b-outer circular arc grooves.
Detailed Description
The invention is described in detail below with reference to the drawings and the specific embodiments. It is noted that the aspects described below in connection with the drawings and the specific embodiments are merely exemplary and should not be construed as limiting the scope of the invention in any way.
As shown in fig. 1, the embodiment provides a method for detecting defects on a glass surface of a product, which includes the following steps:
Step 101, photographing a glass surface of a product for the first time from a first angle, wherein an included angle between the first angle and the glass surface of the product is larger than 0 degrees and smaller than 90 degrees;
102, rotating the product by a second angle around a rotating shaft, wherein the rotating shaft is perpendicular to the glass surface of the product;
step 103, photographing the glass surface of the product for the second time 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 the scratch as an example, when the camera shoots from a certain angle, the scratch may be very insignificant, thus requiring a second shot by changing angles. The existing detection device usually shoots perpendicular to the surface of a product, and even if the product is rotated by a certain angle, the shooting still is difficult to clear. In the method, firstly, the camera and the product are not vertical, but are obliquely shot, and on the basis, the product can be obliquely shot again from another direction by rotating the product, so that the problem that flaws are not obvious under a certain angle can be effectively overcome.
In order to obtain the best photographing effect, the included angle alpha between the first angle and the rotating shaft a is preferably 15-75 degrees. In addition, to maximize the distinctiveness of the first and second shots, the second angle of rotation of the product may be 90 °.
Preferably, in order to obtain an image with higher accuracy, a line camera may be used for photographing, and the use of the line camera also requires movement of the product relative to the line camera. At this time, the method is as shown in fig. 2, and comprises the following steps:
Step 201, driving a product to move along a first direction, and performing first linear scanning photographing on a glass surface of the product from a first angle by using a linear array camera, wherein an included angle between the first angle and the glass surface of the product is larger than 0 degrees and smaller than 90 degrees;
Step 202, driving the product to rotate a second angle around a rotating shaft, wherein the rotating shaft is perpendicular to the glass surface of the product;
Step 203, driving the product to move along the first direction again, and performing second linear scanning photographing on the glass surface of the product from a first angle by using a linear array camera;
and 204, identifying flaws on the glass surface of the product according to the images obtained by the first line scanning photographing and the second line scanning photographing.
It should be noted that the driving of the product in the first direction may be a translational movement or may be another form 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, the embodiment of the application also provides a device for detecting the defects of the glass surface of the product, as shown in fig. 3 to 5, the device comprises:
A camera 310 for taking a first photograph and a second photograph of a glass surface of a product (a lower surface of the product in the drawing) from a first angle;
the driving mechanism 320 is used for rotating the product by a second angle around a rotating shaft, and the rotating shaft is perpendicular 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 this embodiment, the camera 310 is a line camera.
The driving mechanism 320 includes a moving platform, a rotating platform and a product fixing component, 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 this embodiment, the motion platform is a triaxial platform, so that besides driving the product to move along the first direction, the product can be carried. As shown in fig. 2, the three-axis stage includes an X-axis 321, a Y-axis 322, and a Z-axis 323, wherein the Y-axis direction is the first direction of product movement. The rotary platform comprises a rotary motor 324, a product fixing component is a sucker component 325, and the rotary motor 342 is connected with the sucker component 325 through a connecting piece in the vertical direction, so that the rotary shaft is ensured to be perpendicular to the glass surface of the product.
Further, the apparatus further includes a light source 330, where the light source 330 irradiates the glass surface of the product from a third angle, as shown in fig. 5, and the included angle α between the third angle and the rotation axis a is equal to the included angle γ between the first angle and the rotation axis a, so that the light emitted by the light source 330 is reflected by the glass surface of the product to reach the camera 310. In this embodiment, the light source 330 is a linear light source for adapting to the line camera.
In order to be able to adjust the first angle and the third angle to detect a plurality of different types of flaws, the device further comprises a camera fixing assembly 340, which comprises a fixing base 341, a first movable base 342 and a second movable base 343. The camera 310 and the light source 330 are respectively mounted on the first movable seat 342 and the second movable seat 343, and the fixed seat 341 is symmetrically provided with an arc groove, and the first movable seat 342 and the second movable seat 343 are respectively clamped with the arc groove, so that the first movable seat 342 and the second movable seat 343 can rotate along the arc groove.
Before the detection, the first angle and the third angle need to be tested in advance, after the proper angle is found, the first movable seat 342 and the second movable seat 343 are fixed through bolts, and then the subsequent photographing test is performed.
To ensure that the camera 310 and the light source 330 are always aligned, the circular arc grooves may be designed to include an inner circular arc groove 344a and an outer circular arc groove 344b coaxially disposed, and the first movable seat 342 and the second movable seat 343 are engaged with the inner circular arc groove 344a and the outer circular arc groove 344b by means of rollers. The first and second movable seats 342 and 343 perform a pointer movement around the center of a circle due to the restriction of the inner and outer circular arc grooves 344a and 344 b.
The working process of the device is briefly described as follows:
1) The suction cup assembly 325 draws the product from the pick-up station, and first the three-axis platform carries the product to a photographing position 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 line 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 drives the suction cup assembly 325 to rotate 90 ° (both in the forward and reverse directions).
4) The Y-axis 322 drives the product to move along the Y-axis direction, and the linear array camera takes a picture of the glass surface of the product for the second time.
5) After the two photographing is completed, the three-axis platform returns the product to the material taking position.
In summary, the detection device and the detection method provided by the application can more accurately identify flaws on the glass surface by driving the product to change the angle to take photos twice; through setting up the camera fixed subassembly that the angle is adjustable, can adjust the angle of shooing as required, be applicable to the detection of multiple flaw.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer 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 foregoing description is only of preferred embodiments of the application and is not intended to limit the application to the particular embodiments disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the application.
Claims (1)
1. A device for detecting flaws on a glass surface of a product, comprising:
the camera is used for carrying out first photographing and second photographing on the glass surface of the product from a first angle, wherein the included angle between the first angle and the glass surface of the product is more than 0 degrees and less than 90 degrees, and the camera is a linear array camera;
the driving mechanism is used for rotating the product by a second angle around a rotating shaft, and the rotating shaft is perpendicular to the glass surface of the product;
The driving mechanism comprises a moving platform, a rotating platform and a product fixing assembly, wherein the moving platform drives the rotating platform to move, the rotating platform drives the product fixing assembly to rotate, and the product fixing assembly is used for fixing a product;
The device further comprises a light source, wherein the light source irradiates the product glass surface from a third angle, and the included angle between the third angle and the product glass surface is equal to the included angle between the first angle and the product glass surface;
The camera fixing assembly comprises a fixing seat, a first movable seat and a second movable seat, the camera and the light source are respectively arranged 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; the circular arc groove comprises an inner circular arc groove and an outer circular arc groove which are coaxially arranged, the first movable seat and the second movable seat are connected with the inner circular arc groove and the outer circular arc groove in a clamping mode by virtue of idler wheels, and the first movable seat and the second movable seat are fixedly connected with the fixing seat by virtue of bolts.
Priority Applications (1)
| 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 CN113777110A (en) | 2021-12-10 |
| CN113777110B true CN113777110B (en) | 2024-07-09 |
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| 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 |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ATE262677T1 (en) * | 1996-09-05 | 2004-04-15 | Wea Mfg Inc | DEVICE AND METHOD FOR TESTING A SURFACE OF A ROUND GLASS PANEL |
| KR101324015B1 (en) * | 2011-08-18 | 2013-10-31 | 바슬러 비전 테크놀로지스 에이지 | Apparatus and method for detecting the surface defect of the glass substrate |
| CN109030501A (en) * | 2018-07-31 | 2018-12-18 | 苏州天准科技股份有限公司 | A kind of mobile phone glass AF film surface Defect Detection device and detection method |
| 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 |
| CN112964727B (en) * | 2021-02-07 | 2022-08-16 | 厦门威芯泰科技有限公司 | Surface defect developing device and surface defect detecting apparatus |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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