CN111721782A - Optical detection device - Google Patents
Optical detection device Download PDFInfo
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- CN111721782A CN111721782A CN202010595965.5A CN202010595965A CN111721782A CN 111721782 A CN111721782 A CN 111721782A CN 202010595965 A CN202010595965 A CN 202010595965A CN 111721782 A CN111721782 A CN 111721782A
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- camera
- product
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- line scanning
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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
-
- 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
- G01N21/94—Investigating contamination, e.g. dust
Abstract
The present invention provides an optical inspection apparatus comprising: the carrying platform is used for carrying a product to be detected; the camera is arranged above and/or below the carrying platform and is used for acquiring images of a product to be detected; the lamps are arranged above and/or below the carrying platform at different angles with the carrying platform, are arranged adjacent to the camera and are used for illuminating a product to be detected; the controller is connected with the lamps and the camera respectively, and the controller is used for controlling the lamps to be turned on in turn and controlling the frequency of photographing of the camera to be consistent with the frequency of turning on the lamps in turn. According to the optical detection equipment, images of a product to be detected under lighting of different angles can be obtained, and whether the product has defects or not can be judged quickly and accurately through the images.
Description
Technical Field
The invention relates to the field of optical detection, in particular to optical detection equipment.
Background
Transparent products (glass, acrylic plates, crystals and the like) belong to high-reflectivity and high-transparency objects, and various defects can be generated on the surface of the glass in the production and processing processes through a series of process flows, wherein the point defects comprise a plurality of flowers, concave-convex parts, bright points, black points and the like, and the linear defects comprise scratches, indentations and the like.
Taking glass as an example, the glass must be deeply cleaned before being detected, but due to factors such as cleaning technology and workshop environment, the cleanness of the glass in an ideal state after being cleaned cannot be guaranteed at all, some dust and dirt are often stuck to the surface more or less, the dust and dirt can affect normal flaw detection judgment, flaw spots on the glass can be imaged in the existing optical detection, but the spots or lines in the image cannot be effectively distinguished from real flaws of the glass or dust or dirt on the glass, so that much over-killing or leakage is caused.
Therefore, most processing plants are manually judged, flaws and dirt are distinguished by visual observation and manual wiping, and the efficiency is very low.
Disclosure of Invention
In view of this, the invention provides an optical detection device, which can acquire images of a product to be detected under lighting at different angles, and can quickly and accurately determine whether the product has defects through the images.
To solve the above technical problem, in one aspect, the present invention provides an optical inspection apparatus, including:
the carrying platform is used for carrying a product to be detected;
the camera is arranged above and/or below the carrying platform and is used for acquiring images of a product to be detected;
the lamps are arranged above and/or below the carrying platform at different angles with the carrying platform, are arranged adjacent to the camera and are used for illuminating a product to be detected;
the controller is connected with the lamps and the camera respectively, and the controller is used for controlling the lamps to be turned on in turn and controlling the frequency of photographing of the camera to be consistent with the frequency of turning on the lamps in turn.
Further, the camera is a line scanning camera, and the controller controls the line photographing frequency of the line scanning camera to be consistent with the frequency of the plurality of lamps which are turned on in turn.
Further, there are two line scanning cameras, one of the line scanning cameras is disposed above the stage, and the other line scanning camera is disposed below the stage.
Further, the optical detection apparatus further includes:
and the image processing device is connected with the line scanning camera and is used for synthesizing and splitting the images acquired by the line scanning camera.
Further, the synthesizing and splitting the images captured by the cameras comprises:
firstly, synthesizing line images scanned by the line scanning camera into a combined image;
then, splitting a split image formed by the line scanning camera taking a picture under each lamp illumination from the combined image.
Further, the optical detection apparatus further includes:
and the flaw judgment device is connected with the image processing device and is used for judging whether the product to be detected has flaws according to the combined image and/or the split image.
Further, the defect determining device determines whether the product to be detected has defects through a deep learning model, and the deep learning model is obtained by performing deep learning on a plurality of images of the product to be detected with defects and the product to be detected without defects.
Further, the number of the lamps is four, two of the lamps are arranged above the carrier, and the other two lamps are arranged below the carrier.
Further, the carrying platform is a conveying belt, and the optical detection device further comprises a driving device which is connected with the conveying belt so as to drive the conveying belt to move.
Further, the conveyor belt is formed with a gap, and the lamp and the camera are both disposed around the gap.
The technical scheme of the invention at least has one of the following beneficial effects:
the optical detection equipment comprises a carrying platform, a camera, a plurality of lamps and a controller, wherein the carrying platform bears a product to be detected, the product to be detected is illuminated by the lamps at different angles in turn, the frequency of the lamps which are illuminated by the lamps in turn is consistent with the photographing frequency, so that images under different lamp illumination can be acquired, the defects and dirty dust of the product to be detected have different reflectivities and different positions, and the characteristics of the images under different angle lamp illumination are different, so that the defects and the dirty dust can be distinguished, and whether the product to be detected has defects or not can be judged.
Drawings
FIG. 1 is a schematic diagram of an optical apparatus according to an embodiment of the present invention;
FIG. 2 is a logic diagram of a timing sequence of camera photographing and a logic diagram of a lighting sequence according to an embodiment of the present invention;
FIG. 3 is a combined image under different lamp illuminations according to an embodiment of the present invention;
FIG. 4 is a split image under different lamp illuminations according to an embodiment of the present invention;
fig. 5 is a split image of a glass illuminated by different lamps according to an embodiment of the invention.
Reference numerals:
1. an on-line scanning camera body; 2. mounting a lens; 3. a signal lamp; 4. a second lamp; 5. a conveyor belt; 6. a product to be detected; 7. scanning the camera body off line; 8. a lower lens; 9. a third lamp; 10. and a fourth lamp.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the drawings of the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention, are within the scope of the invention.
Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The use of "first," "second," and similar terms in the present application do not denote any order, quantity, or importance, but rather the terms are used to distinguish one element from another. Also, the use of the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships are changed accordingly.
Hereinafter, an optical detection apparatus according to an embodiment of the present invention is described with reference to the drawings.
As shown in fig. 1, the optical inspection apparatus according to the present invention includes: microscope carrier, camera, a plurality of lamp and controller.
First, the stage is explained. The carrier is used for bearing the product to be detected.
The stage may be mobile (e.g., a conveyor belt, a conveyor table, etc.).
Next, the camera is explained. The camera is arranged above and/or below the carrying platform and is used for acquiring images of the product to be detected.
In other words, the camera may be disposed above the stage to capture the image of the product to be detected from above, the camera may be disposed below the stage to capture the image of the product to be detected from below, or the cameras may be disposed above and below the stage respectively to capture the images of the product to be detected from above and below synchronously.
Next, a plurality of lamps will be explained.
A plurality of lamps (which may also be understood as light sources) are arranged above and/or below the stage at different angles to the stage and are arranged adjacent to the camera for illuminating the product to be inspected.
Treat that the flaw of waiting to detect the product is different with the dirty material of dust and cause the reflexibility different, and flaw and the dirty position difference of dust moreover (the dirt of dust is the adhesion surface, and the flaw is deepened inside the product), through the lamp illumination of different angles, the reflexibility is different can show with the position difference on the image, the image of waiting to detect the product under the different lamp illumination of analysis can distinguish flaw and dust are dirty to can accurately detect out and detect and treat that the product has the flaw.
Finally, the controller is explained.
The controller is connected with the lamps and the camera respectively, and the controller is used for controlling the lamps to be turned on in turn and controlling the frequency of photographing of the camera to be consistent with the frequency of the lamps to be turned on in turn.
The controller may be a single chip or a Programmable Logic Controller (PLC).
In other words, the lighting and photographing process is as follows: one light is on, the camera takes a picture, the light is off, the other light is on, the camera takes a picture again, the light is off … …, and the lights are cycled on and take a picture. Therefore, images under the illumination of different lamps can be collected, and the situation that the defects and the dirty dust cannot be distinguished due to the fact that the different lamps are simultaneously lighted in a light superposition mode is avoided.
The optical detection equipment who forms more than, the microscope carrier bears and waits to detect the product, treat through the lamp of a plurality of different angles and detect the product and carry out the illumination in turn, the frequency that a plurality of lamps are lighted the lamp in turn is unanimous with the frequency of shooing, thereby can gather the image under the different lamp illumination, it is different with the position to detect the flaw of product and the reflectivity difference of dirty dust, the characteristic of image is different under the different lamp illumination, thereby can distinguish flaw and dirty dust, and then can judge and detect whether there is the flaw in the product.
According to some embodiments of the present invention, the camera is a line scanning camera, and the controller controls a line photographing frequency of the line scanning camera to be consistent with a frequency at which the plurality of lamps are turned on in turn.
The line scanning camera has the advantages of small structure, low cost and high precision, and can save the installation space of the camera, reduce the cost and improve the precision. The line scanning camera line shooting (line scanning) frequency is consistent with the frequency of the multiple lamps lighting in turn, the line scanning camera can ensure that the products to be detected move, the line scanning camera can synchronously acquire images of the products to be detected under the illumination of different lamps under the condition that the multiple lamps illuminate in turn, the condition that the traditional camera can only acquire one image under the illumination of one lamp to cause different positions of flaws and/or dirty images under the illumination of different lamps is avoided, therefore, the relevance between the images of the products to be detected under the illumination of different lamps can be established, flaws and dirty dust can be distinguished more favorably, and the accuracy of flaw detection is improved.
Further, there are two line scanning cameras, wherein one line scanning camera is arranged above the carrying platform, and the other line scanning camera is arranged below the carrying platform.
The two line scanning cameras can synchronously acquire images of the product to be detected from the upper part and the lower part of the product to be detected, so that flaws and dirty dust can be distinguished, and the precision of detecting the flaws of the product to be detected is further improved.
For example, as shown in fig. 1, the product 6 to be detected is glass, the stage of the optical detection apparatus is a conveyor belt 5, the conveyor belt 5 is divided into two sections, a gap is formed between the two sections, an upper line scanning camera (including an upper line scanning camera body 1 and an upper lens 2) is arranged at the upper right of the gap, a first lamp 3 and a second lamp 4 are arranged at two angles at the upper left of the gap, a third lamp 9 and a fourth lamp 10 are arranged at two angles at the lower left of the gap, and a lower line scanning camera (including a lower line scanning camera body 7 and a lower lens 8) is arranged at the lower right of the gap.
As shown in fig. 2, diagram a is a timing logic diagram of a controller controlling a line scanning camera, and is composed of a high signal and a low signal, where the high signal is a signal for photographing by the camera. The B/C/D/E diagram is a time sequence logic diagram of the controller for controlling the lamps and is composed of a high-order signal and a low-order signal, and the high-order signal is a signal for lighting different lamps. Therefore, the line shooting frequency of the line scanning camera is consistent with the frequency of the plurality of lamps which are turned on in turn.
Further, the optical detection apparatus further includes an image processing device.
The image processing device is connected with the line scanning camera and used for synthesizing and splitting images acquired by the line scanning camera.
The image processing device can synthesize the image collected by the line scanning camera into a combined image, and can also split a plurality of split images so as to detect whether the product to be detected has flaws.
Further, the synthesizing and splitting of the images captured by the cameras includes:
firstly, synthesizing line images scanned by a line scanning camera into a combined image;
next, the line scan camera splits the split image from the combined image by taking a picture of each lamp under illumination.
For example, as shown in fig. 3, the line scan camera performs line photographing, the first line is a light 3, the image of line photographing (a picture), the second line is a light 4, the image of line photographing (B picture), the third line is a light 9, the image of line photographing (C picture), the fourth line is a light 10, the image of line photographing (D picture), and then the fifth line is a light 3, the image of line photographing … … sequentially circulates, and a combined image is synthesized.
As shown in fig. 4, the combined image in fig. 3 is divided into a divided image of the first lamp 3 (fig. a), a divided image of the second lamp 4 (fig. B), a divided image of the third lamp 9 (fig. C), and a divided image of the fourth lamp 10 (fig. D).
The method for obtaining the split image is specifically described by taking the scratch of the glass as an example.
As shown in fig. 5, the scratch above the arrow is in the image (corresponding to a picture a/B/C/D respectively) collected by the line scanning camera under the illumination of the first lamp 3, the second lamp 4, the third lamp 9 and the fourth lamp 10, the scratch cannot be seen under the illumination of the first lamp 3 and the third lamp 9, the obvious scratch is seen under the illumination of the second lamp 4 and the fourth lamp 10, and whether the scratch has a defect can be determined by experience or by comparing samples (scratch, dirty samples, etc.).
Therefore, a better combined image and a better split image can be obtained, so that flaws and dirty dust can be distinguished more easily, and the accuracy of judging whether the product to be detected has flaws is improved.
Further, the optical inspection apparatus further includes a flaw determination device. And the flaw judgment device is connected with the image processing device and is used for judging whether the product to be detected has flaws according to the combined image and/or the split image.
The defect determining device may be a computer or the like. Whether the product to be detected has the flaw or not is judged through the flaw judging device on the combined image and/or the split image, and compared with manual judgment, the method is more accurate, high in speed and high in efficiency.
Furthermore, the defect judging device judges whether the product to be detected has defects through a deep learning model, and the deep learning model is obtained by deep learning a plurality of images of the product to be detected with the defects and the product to be detected without the defects.
Deep learning is a mature technology and will not be addressed in detail here. The deep learning model can automatically detect whether the product to be detected has the defect capacity by training the deep model through the image of the product to be detected with the defect and the product to be detected without the defect. Therefore, whether the product to be detected has the defects or not can be identified efficiently, stably and accurately.
According to some embodiments of the invention, the lamps are four, two of the lamps being arranged above the carrier and two of the lamps being arranged below the carrier.
For example, as shown in fig. 1, the first lamp 3 and the second lamp 4 are disposed above the stage, and the third lamp 9 and the fourth lamp 10 are disposed below the stage. Therefore, the camera can conveniently acquire an image which is easy to judge the flaw.
It should be noted that the above is only an optional example, and there may also be 8 lamps, which are disposed above and below the stage symmetrically, and these should be understood in the present invention.
Further, the carrier is a conveyor belt 5, and the optical detection apparatus further includes a driving device, where the driving device is connected to the conveyor belt 5 to drive the conveyor belt 5 to move.
The conveying of the products to be detected by the conveyor belt has high efficiency, large capacity and convenient operation. For example, in the actual glass production process, a piece of glass passes through a cleaning machine on a flow line, the cleaned glass directly enters an optical detection device for flaw detection, and the glass is butted and detected with the cleaning machine in a conveying belt (such as a belt flow line) mode, so that the process flow is smoother.
Further, the conveyor belt 5 is formed with a gap, and the lamp and the camera are disposed around the gap.
The gap can be used for facilitating the lamp below the carrier to illuminate the product to be detected, and the camera below the carrier is used for collecting accurate images, so that flaw judgment of the product to be detected is facilitated.
The foregoing is a preferred embodiment of the present invention, and it should be noted that it would be apparent to those skilled in the art that various modifications and enhancements can be made without departing from the principles of the invention, and such modifications and enhancements are also considered to be within the scope of the invention.
Claims (10)
1. An optical inspection apparatus, comprising:
the carrying platform is used for carrying a product to be detected;
the camera is arranged above and/or below the carrying platform and is used for acquiring images of a product to be detected;
the lamps are arranged above and/or below the carrying platform at different angles with the carrying platform, are arranged adjacent to the camera and are used for illuminating a product to be detected;
the controller is connected with the lamps and the camera respectively, and the controller is used for controlling the lamps to be turned on in turn and controlling the frequency of photographing of the camera to be consistent with the frequency of turning on the lamps in turn.
2. The optical inspection apparatus of claim 1, wherein the camera is a line scanning camera, and the controller controls a line-taking frequency of the line scanning camera to be consistent with a frequency at which the plurality of lamps are turned on in turn.
3. The optical inspection apparatus of claim 2, wherein there are two of the line scanning cameras, one of the line scanning cameras being disposed above the stage and the other of the line scanning cameras being disposed below the stage.
4. The optical inspection apparatus of claim 3, further comprising:
and the image processing device is connected with the line scanning camera and is used for synthesizing and splitting the images acquired by the line scanning camera.
5. The optical inspection device of claim 4, wherein the compositing and splitting the images captured by the camera comprises:
firstly, synthesizing line images scanned by the line scanning camera into a combined image;
then, splitting a split image formed by the line scanning camera taking a picture under each lamp illumination from the combined image.
6. The optical inspection apparatus of claim 5, further comprising:
and the flaw judgment device is connected with the image processing device and is used for judging whether the product to be detected has flaws according to the combined image and/or the split image.
7. The optical inspection apparatus according to claim 6, wherein the defect determining means determines whether the product to be inspected has a defect or not by a deep learning model obtained by deep learning a plurality of images of the product to be inspected having a defect and the product to be inspected having no defect.
8. The optical inspection apparatus of claim 1, wherein the number of lamps is four, two of the lamps being disposed above the stage and two of the lamps being disposed below the stage.
9. The optical inspection apparatus of claim 8, wherein the stage is a conveyor belt, and the optical inspection apparatus further comprises a driving device connected to the conveyor belt to drive the conveyor belt to move.
10. The optical inspection apparatus of claim 9, wherein the conveyor belt is formed with a gap, the lamp and the camera both being disposed around the gap.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010595965.5A CN111721782A (en) | 2020-06-28 | 2020-06-28 | Optical detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010595965.5A CN111721782A (en) | 2020-06-28 | 2020-06-28 | Optical detection device |
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| CN111721782A true CN111721782A (en) | 2020-09-29 |
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| CN202010595965.5A Pending CN111721782A (en) | 2020-06-28 | 2020-06-28 | Optical detection device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114414477A (en) * | 2021-12-21 | 2022-04-29 | 苏州天准科技股份有限公司 | Multi-angle detection device for motor vehicle parts and assembly device |
| WO2022262133A1 (en) * | 2021-06-16 | 2022-12-22 | 美晟通科技(苏州)有限公司 | Method and device for detecting position of stain on transparent medium |
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Application publication date: 20200929 |