CN111751386B - Machine vision optical detection system and method - Google Patents
Machine vision optical detection system and method Download PDFInfo
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- CN111751386B CN111751386B CN202010731302.1A CN202010731302A CN111751386B CN 111751386 B CN111751386 B CN 111751386B CN 202010731302 A CN202010731302 A CN 202010731302A CN 111751386 B CN111751386 B CN 111751386B
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- plate
- plate body
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- collimated light
- optical detection
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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
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/8851—Scan or image signal processing specially adapted therefor, e.g. for scan signal adjustment, for detecting different kinds of defects, for compensating for structures, markings, edges
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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
- G01N21/95—Investigating the presence of flaws or contamination characterised by the material or shape of the object to be examined
- G01N21/958—Inspecting transparent materials or objects, e.g. windscreens
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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
- G01N21/8851—Scan or image signal processing specially adapted therefor, e.g. for scan signal adjustment, for detecting different kinds of defects, for compensating for structures, markings, edges
- G01N2021/8887—Scan or image signal processing specially adapted therefor, e.g. for scan signal adjustment, for detecting different kinds of defects, for compensating for structures, markings, edges based on image processing techniques
Abstract
The invention discloses a machine vision optical detection system and a method, which are used for detecting whether a transparent plate has surface defects and/or internal defects, wherein the transparent plate is provided with a plate top surface, a plate bottom surface parallel to the plate top surface and a plate side surface between the plate top surface and the plate bottom surface; and a machine vision camera disposed on the board body top surface side of the transparent board body, the machine vision camera being for image-taking the transparent board body. The invention has the beneficial effects that: by utilizing the detection system, whether the defect of the transparent plate body is a surface defect or an internal defect can be effectively distinguished, and the accuracy of product detection is greatly improved.
Description
Technical Field
The invention relates to the field of machine vision, in particular to an optical detection system and method for machine vision.
Background
At present, the existing machine vision optical detection system can detect whether a transparent plate (such as glass) has defects, but cannot distinguish whether the existing defects are surface defects such as dust and impurities or internal defects such as bubbles, firmness and impurities. The surface defects such as dust and impurities can be removed later by cleaning, manual wiping and the like, namely, the surface defects do not affect the product quality. However, internal defects such as bubbles, firmness, impurities and the like can affect product quality and need to be graded or scrapped according to industry standards. Therefore, it is very necessary to distinguish the formation positions of defects in the transparent plate body for quality inspection of the transparent plate body.
Disclosure of Invention
The invention provides a novel machine vision optical detection system and a novel machine vision optical detection method, aiming at solving the problem that a machine vision optical detection system in the prior art cannot distinguish surface defects and internal defects of a transparent plate body.
In order to achieve the purpose, the technical scheme of the invention is as follows: and the machine vision optical detection system is used for detecting whether the transparent plate body has surface defects and/or internal defects. The transparent plate body is provided with a plate body top surface, a plate body bottom surface parallel to the plate body top surface and a plate body side surface between the plate body top surface and the plate body bottom surface. The machine vision optical detection system comprises a machine vision optical detection system,
the collimated light source is arranged on the side face of the transparent plate body and is aligned to the side face of the transparent plate body, and a collimated light beam formed by the collimated light source penetrates through the side face of the transparent plate body to enter the inside of the transparent plate body in a manner of being parallel to the top face of the transparent plate body; and the number of the first and second groups,
a machine vision camera disposed on the board body top surface side of the transparent board body, the machine vision camera for image-taking the transparent board body.
As a preferable scheme of the machine vision optical detection system, the collimated light source is a point laser, a line laser or a surface laser.
As a preferable scheme of the machine vision optical detection system, the collimated light source is white light or other monochromatic light except the white light.
Preferably, the machine vision optical detection system is an area-array camera or a line-scan camera.
The invention also relates to a machine vision optical detection method, which comprises the following steps,
providing a machine vision optical inspection system;
collimated light beams formed by the collimated light sources pass through the side faces of the plate body to enter the interior of the transparent plate body in a mode of being parallel to the top face of the plate body;
the machine vision camera image captures the transparent plate body to obtain an optical detection image about the transparent plate body; and the number of the first and second groups,
and judging whether the transparent plate body has surface defects and/or internal defects or not according to the optical detection image.
As a preferable scheme of the machine vision optical detection method, the size of the light spot of the collimated light beam is equivalent to the thickness of the side face of the plate body, so that the light spot of the collimated light beam can just completely cover the side face of the plate body, and the machine vision camera only needs to perform image shooting once.
As a preferable scheme of the machine vision optical detection method, the size of the light spot of the collimated light beam is smaller than the thickness of the side surface of the plate body, so that the light spot of the collimated light beam does not completely cover the side surface of the plate body, and one of the transparent plate body and the collimated light source is displaced upwards or downwards to ensure that the light spot of the collimated light beam completely passes through the side surface of the plate body, and further, the machine vision camera needs to perform image pickup for multiple times.
As a preferable scheme of the machine vision optical detection method, if a bright point exists in the optical detection image, it indicates that the transparent plate body has an internal defect at the bright point.
As a preferable scheme of the machine vision optical detection method, if a black spot exists in the optical detection image, it indicates that the transparent plate body has a surface defect at the black spot.
Preferably, the optical inspection method for machine vision is such that, if the optical inspection image shows uniform luminance, it indicates that the transparent plate has no surface defect or internal defect.
Compared with the prior art, the invention has the beneficial effects that: by utilizing the detection system, whether the defect of the transparent plate body is a surface defect or an internal defect can be effectively distinguished, and the accuracy of product detection is greatly improved.
In addition to the technical problems solved by the present invention, the technical features constituting the technical solutions, and the advantageous effects brought by the technical features of the technical solutions described above, other technical problems solved by the present invention, other technical features included in the technical solutions, and advantageous effects brought by the technical features will be described in further detail with reference to the accompanying drawings.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
FIG. 2 is a flow chart of the method of the present invention.
Fig. 3 is a schematic diagram of the principle of the present invention.
Detailed Description
The invention will be described in further detail below with reference to specific embodiments and drawings. Here, the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Referring to fig. 1 to 3, a machine vision optical inspection system is shown for inspecting a transparent plate body 1 for the presence of surface defects 101 and/or internal defects 102. Wherein the transparent plate body 1 is a single transparent material (such as glass). The transparent plate body 1 has a plate body top surface 11, a plate body bottom surface 12 parallel to the plate body top surface 11, and a plate body side surface 13 between the plate body top surface 11 and the plate body bottom surface 12. In this embodiment, the plate body side surface 13 is a right side surface of the transparent plate body 1.
The machine vision optical detection system comprises a collimated light source 2, a machine vision camera 3 (including a lens) and the like.
The collimated light source 2 is arranged on the plate body side surface 13 side of the transparent plate body 1. In this embodiment, the collimated light source 2 is disposed on the right side of the transparent plate 1. The collimated light sources 2 are aligned with the plate body side faces 13. The collimated light beam formed by the collimated light source 2 passes through the plate side surface 13 to the left in parallel with the plate top surface 11 and enters the inside of the transparent plate 1. The collimation light source 2 has the characteristic of good collimation property, and can select point laser, line laser, surface laser or other materials. The collimated light source 2 is white light or other monochromatic light except the white light. The collimated light source 2 may be a single independent light source or a light source group consisting of a plurality of independent light sources.
The machine vision camera 3 is arranged on the board body top surface 11 side of the transparent board body 1. In this embodiment, the machine vision camera 3 is disposed directly above the transparent plate 1. The lens of the machine vision camera 3 is set down. The machine vision camera 3 is used for image shooting the transparent plate body 1. The machine vision camera 3 is an area-array camera or a line-scan camera.
Referring to fig. 2 again, the detection method of the machine vision optical detection system is as follows:
the collimated light beam formed by the collimated light source 2 enters the inside of the transparent plate body 1 through the plate body side surface 13 in a manner parallel to the plate body top surface 11. The machine vision camera 3 image-captures the transparent plate body 1 to obtain an optical detection image about the transparent plate body 1.
If there is a bright spot in the optical detection image, it indicates that the internal defect 102 exists in the transparent plate 1 at the bright spot. The reason is that, referring to fig. 3, if there is the internal defect 102 in the transparent board 1, when the collimated light beam reaches the internal defect 102, a reflection in all directions is formed, and some of the reflection passes upward through the top surface 11 of the board, i.e. the bright spot is generated on the optical inspection image.
If a black spot exists in the optical detection image, it indicates that the surface defect 101 exists at the black spot of the transparent plate 1. The reason is that, referring to fig. 3, if the surface defect 101 exists in the transparent plate 1, since the collimated light beam only passes through the inside of the transparent plate 1, the surface defect 101 is located on the top surface 11 of the plate, and a blocking portion is formed to block light from entering the machine vision camera 3, that is, the black spot is generated on the optical inspection image.
If the optical detection image shows uniform luminance (i.e., no bright spots or no black spots), it indicates that the transparent plate 1 has no surface defect 101 or internal defect 102.
In this embodiment, the spot size of collimated light beam is equivalent to the thickness of plate body side 13, makes the spot of collimated light beam can just in time completely cover plate body side 13, machine vision camera 3 only needs to carry out image capture once, just can realize right transparent plate body 1's comprehensive detection.
In another embodiment, the spot size of the collimated beam is less than the thickness of the plate side 13, such that the spot of the collimated beam does not completely cover the plate side 13. For the purpose of full-scale detection, one of the transparent plate 1 and the collimated light source 2 may be shifted up or down to ensure that the spot of the collimated light beam passes through the entire plate side 13, and the machine vision camera 3 needs to perform multiple image captures in coordination with the shift.
The foregoing merely represents embodiments of the present invention, which are described in some detail and detail, and therefore should not be construed as limiting the scope of the invention. It should be noted that, for those skilled in the art, various changes and modifications can be made without departing from the spirit of the invention, and these changes and modifications are all within the scope of the invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (4)
1. The machine vision optical detection method is characterized by comprising the following steps,
providing a machine vision optical detection system for detecting whether a transparent plate has surface defects and/or internal defects, wherein the transparent plate has a plate top surface, a plate bottom surface parallel to the plate top surface and a plate side surface between the plate top surface and the plate bottom surface, and the machine vision optical detection system comprises a collimated light source which is arranged on the plate side surface side of the transparent plate, the collimated light source is aligned to the plate side surface, and a collimated light beam formed by the collimated light source penetrates through the plate side surface in a manner of being parallel to the plate top surface and enters the transparent plate; and a machine vision camera disposed on the board body top surface side of the transparent board body, the machine vision camera for image-taking the transparent board body;
collimated light beams formed by the collimated light sources pass through the side faces of the plate body to enter the interior of the transparent plate body in a mode of being parallel to the top face of the plate body;
the machine vision camera image captures the transparent plate body to obtain an optical detection image about the transparent plate body: if the size of the light spot of the collimated light beam is equivalent to the thickness of the side face of the plate body, the light spot of the collimated light beam can just completely cover the side face of the plate body, and the machine vision camera only needs to perform image shooting once; and the number of the first and second groups,
judging whether the transparent plate has surface defects and internal defects according to the optical detection image: if a bright spot exists in the optical detection image, indicating that the transparent plate body has an internal defect at the bright spot; if the optical detection image has black points, indicating that the transparent plate body has surface defects at the black points; if the optical detection image shows uniform brightness, the transparent plate body is free of surface defects and internal defects.
2. The machine-vision optical inspection method of claim 1, wherein the collimated light source is a point laser, a line laser, or a surface laser.
3. The machine-vision optical inspection method of claim 1, wherein the collimated light source is white light.
4. The machine-vision optical inspection method of claim 1, wherein the machine-vision camera is an area-array camera or a line-scan camera.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010731302.1A CN111751386B (en) | 2020-07-27 | 2020-07-27 | Machine vision optical detection system and method |
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| CN202010731302.1A CN111751386B (en) | 2020-07-27 | 2020-07-27 | Machine vision optical detection system and method |
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| CN111751386A CN111751386A (en) | 2020-10-09 |
| CN111751386B true CN111751386B (en) | 2022-08-05 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113686879A (en) * | 2021-09-09 | 2021-11-23 | 杭州利珀科技有限公司 | Optical film defect visual detection system and method |
Citations (4)
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|---|---|---|---|---|
| JPH0518900A (en) * | 1991-07-12 | 1993-01-26 | Ricoh Co Ltd | Method and device for inspecting defect of lens |
| JPH06294749A (en) * | 1993-04-09 | 1994-10-21 | Nippon Electric Glass Co Ltd | Flaw inspection method for plat glass |
| JP2004150971A (en) * | 2002-10-31 | 2004-05-27 | Nitto Denko Corp | Inspection method and inspection apparatus of film |
| JP2005043229A (en) * | 2003-07-22 | 2005-02-17 | Sumitomo Osaka Cement Co Ltd | Device for inspecting defect of transparent plate |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2352012A4 (en) * | 2008-11-20 | 2014-05-21 | Asahi Glass Co Ltd | Transparent body inspecting device |
| DE102010037788B4 (en) * | 2010-09-27 | 2012-07-19 | Viprotron Gmbh | Method and device for displaying automatically determined fault locations |
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2020
- 2020-07-27 CN CN202010731302.1A patent/CN111751386B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0518900A (en) * | 1991-07-12 | 1993-01-26 | Ricoh Co Ltd | Method and device for inspecting defect of lens |
| JPH06294749A (en) * | 1993-04-09 | 1994-10-21 | Nippon Electric Glass Co Ltd | Flaw inspection method for plat glass |
| JP2004150971A (en) * | 2002-10-31 | 2004-05-27 | Nitto Denko Corp | Inspection method and inspection apparatus of film |
| JP2005043229A (en) * | 2003-07-22 | 2005-02-17 | Sumitomo Osaka Cement Co Ltd | Device for inspecting defect of transparent plate |
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