CN110579489A - Defect detection method for mirror bowl-shaped structure product - Google Patents
Defect detection method for mirror bowl-shaped structure product Download PDFInfo
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- CN110579489A CN110579489A CN201911092080.7A CN201911092080A CN110579489A CN 110579489 A CN110579489 A CN 110579489A CN 201911092080 A CN201911092080 A CN 201911092080A CN 110579489 A CN110579489 A CN 110579489A
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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
- G01N21/8851—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
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- Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)
Abstract
The invention relates to a defect detection method for a mirror surface bowl-shaped structure product, which adopts a plurality of cameras and corresponding strip-shaped light sources to sequentially image a part of the surface of the product to be detected, well presents all defects on the surface of the product, solves the problem that the surface defects of the high-reflection mirror surface bowl-shaped product cannot be imaged, realizes the automatic detection of the product, and helps a production line to improve the quality and the capacity of the product.
Description
Technical Field
The invention relates to the technical field of visual inspection, in particular to a defect detection method for a mirror surface bowl-shaped structure product.
Background
With the continuous development of society, the industrial automation degree is higher and higher, not only production is replaced by the machine, and manual detection also can be replaced by the machine, and machine vision is therefore used extensively. In all surface defect detection, the aim of imaging exploration must be to find an imaging mode which can obtain better defect contrast and uniform images. For the surface detection of mirror surface products, imaging generally needs to form a light spot effect to present a good defect, but the imaging problem cannot be well solved for products with a bowl surface shape while the mirror surface is formed. According to the characteristic that the dome light source can reduce the influence caused by uneven surface, the imaging contrast is reduced by using the dome light source for imaging. The customized large-area vertical ring light and large-size parallel coaxial testing are adopted, the large-area vertical ring light can obtain a relatively uniform light spot imaging effect, but the small defect effect imaging of the large light spot is found to be poor in the later defect testing process, the detection requirement cannot be met, and in order to increase the contrast ratio of the light source, the light source is reformed in a mode of increasing a light source parallel film and cannot be met; in multiple tests, defects can be better presented only in a certain range of light spots, the detection requirement can be met, and optical interference exists in large light spots.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: overcomes the defects in the prior art and provides a defect detection method for a mirror bowl-shaped structure product.
The technical scheme adopted by the invention for solving the technical problems is as follows: a defect detection method for mirror bowl-shaped structure products comprises the following process steps:
(1) Placing a mirror bowl-shaped structure product to be detected on a bearing table, adjusting the positions of all cameras to ensure that all cameras are positioned right above the middle part of the product to be detected, and enabling one camera to correspond to one group of strip-shaped light sources;
(2) Each group of strip-shaped light sources is used for polishing in a time-sharing manner, and the corresponding cameras are used for imaging the product to be detected in sequence to obtain imaging results positioned at different positions on the surface of the product to be detected;
(3) and (3) adjusting the height of each group of strip-shaped light sources, continuously observing the imaging result of the product to be detected in the step (2) in the height adjusting process until the strip-shaped light spot effect is presented, adjusting the position of each group of strip-shaped light sources in the horizontal direction, performing width and length calculation on the strip-shaped light spot image imaged by the product to be detected in the adjusting process, ensuring that the sum of the maximum widths of all the strip-shaped light spot images is greater than the maximum length of the strip-shaped light spot image, finally observing whether black features exist in all the strip-shaped light spot images, and judging the product to be defective if the black features exist.
the bowl surface is actually a surface with a constantly changing radian, the light of the strip light at a fixed position irradiates a certain section of the bowl surface within a certain radian changing range, and most of the light is reflected into the camera lens to form a light spot effect; the interval can be replaced by changing the strip light fixing position to form the light spot effect, and the effect can well show all defects on the surface of a product to be detected.
Each group of strip-shaped light sources can present the strip-shaped light spot effect only by vertically adjusting the height of the strip-shaped light sources, and then the interval where the strip-shaped light spots are located can be changed by adjusting the position of each group of strip-shaped light sources in the horizontal direction; although the wider strip-shaped light spots are more uniform in image, optical interference exists, the defect effect is weakened, and the light spot effect which is shown when the sum of the maximum widths of all strip-shaped light spot images is larger than the maximum length of the longest strip-shaped light spot image is the best defect polishing effect.
When the light passes through the tiny defects of the unevenness, such as crushing and scratching of the product to be detected, no light is reflected, and therefore the black imaging characteristic is presented.
It is further defined that the camera in step (1) includes a first camera, a second camera and a third camera, the first camera corresponds to the first group of bar light sources, the second camera corresponds to the second group of bar light sources, the third camera corresponds to the third group of bar light sources, the first group of bar light sources and the second group of bar light sources have two bar light sources, and the third group of bar light sources is one bar light source.
The 3 groups of strip light sources can ensure the presenting effect of the surface defects of the mirror bowl-shaped structure product to be detected, and are the most suitable light source groups; if the number of the strip light sources is less than 3, light spots must be enlarged to ensure that the whole bowl surface is shot, so that certain surface defects cannot be well presented; if the number of the defect data is larger than 3 groups, the number of images of the system is increased, and the difficulty of defect data synthesis is increased.
Further limiting, one strip light source in the first group of strip light sources is arranged on one side of a first camera, and the first camera images a product to be detected to obtain an image of a strip light spot positioned at the edge of the product to be detected; and arranging another symmetrical strip-shaped light source on the other side of the first camera, imaging the product to be detected again, and obtaining images of two strip-shaped light spots respectively positioned on the two side edges of the product to be detected.
Further limiting, one strip light source in the second group of strip light sources is vertically arranged on one side of the second camera, and the second camera images the product to be detected to obtain an image of a strip light spot positioned at the middle part of the product to be detected, which is close to the middle part; and arranging another symmetrical strip-shaped light source on the other side of the second camera, and imaging the product to be detected again to obtain images of two strip-shaped light spots respectively close to the middle part of the product to be detected.
And further limiting, one strip light source of the third group of strip light sources is fixed right above the middle part of the product to be detected, the strip light source is used for polishing, the third camera position is rotated, the product to be detected is imaged, the image with the maximum strip light spot width is found out, and the camera rotation angle corresponding to the image is recorded.
Further, the height of each group of strip-shaped light sources in the step (3) is 160 mm.
Further, the black features in the step (3) are specifically presented in black blocks, black flowers and black stripes.
The invention has the beneficial effects that: according to the invention, a plurality of cameras and corresponding strip-shaped light sources are adopted to sequentially image a part of the surface of the product to be detected, so that all defects of the surface of the product are well presented, the problem that the defects of the surface of the bowl-shaped product with a high reflective mirror surface cannot be imaged is solved, the automatic detection of the product is realized, and the product quality and the productivity of a production line are improved.
Drawings
The invention is further illustrated with reference to the following figures and examples.
FIG. 1 is a schematic structural diagram of an imaging device for detecting a product with a mirror bowl structure according to the present invention.
FIG. 2 is an image of a first camera illuminated by a first set of bar light sources according to the present invention.
FIG. 3 is an image of a second camera illuminated by a second set of bar light sources according to the present invention.
FIG. 4 is an image of a third camera under illumination by a third set of bar light sources according to the present invention.
Detailed Description
The invention will now be further described with reference to the accompanying drawings and preferred embodiments. These drawings are simplified schematic views illustrating only the basic structure of the present invention in a schematic manner, and thus show only the constitution related to the present invention.
Example one
A defect detection method for a mirror surface bowl-shaped structure product is disclosed, wherein an imaging device shown in figure 1 comprises a first camera, a second camera and a third camera which are arranged side by side, the first camera corresponds to a first group of strip-shaped light sources, the second camera corresponds to a second group of strip-shaped light sources, the third camera corresponds to a third group of strip-shaped light sources, the first group of strip-shaped light sources and the second group of strip-shaped light sources are provided with two strip-shaped light sources, and the third group of strip-shaped light sources is one strip-shaped light source.
During specific operation, a mirror surface bowl-shaped structure product to be detected is placed on a bearing table (the bearing table is fixed on a conveying belt and moves along with the conveying belt), the positions of all cameras are adjusted, and all cameras are ensured to be in a vertical state; when a product to be detected moves to a position right below a first camera, firstly moving the height of one strip-shaped light source in a first group of strip-shaped light sources on the left side of the first camera, continuously observing an imaging result of the product to be detected in the height adjusting process, after repeated tests, when the height of the strip-shaped light source is 160mm, the imaging result shows a strip-shaped light spot effect, then adjusting the position of the strip-shaped light source in the horizontal direction, meanwhile, polishing by the strip-shaped light source, and imaging the product to be detected by the first camera until an image of the strip-shaped light spot positioned at the edge of the bowl surface is obtained; another strip light source in the first group of strip light sources is symmetrically adjusted on the right side of the first camera, two strip light sources of the first group of strip light sources are simultaneously polished, the first camera images a product to be detected to obtain images of two strip light spots positioned on two side edges of the bowl surface, and as shown in fig. 2, the maximum length L in the formed images is obtained through calculation of image processing software1maxAnd the width W of the strip-shaped light spot1；
When a product to be detected moves to the position right below the second camera, directly adjusting the height of one strip light source in the second group of strip light sources on the left side of the second camera to 160mm, then adjusting the position of the strip light source in the horizontal direction, meanwhile, polishing the strip light source, and imaging the product to be detected by the second camera until an image with a strip light spot positioned on the middle part of the bowl surface is obtained; another strip light source in the second group of strip light sources is symmetrically adjusted on the right side of the second camera, two strip light sources in the second group of strip light sources are simultaneously polished, the second camera images a product to be detected to obtain an image of two strip light spots positioned on the middle part of the bowl surface, and as shown in fig. 3, the maximum length L in the formed image is obtained through calculation of image processing software2maxAnd the width W of the strip-shaped light spot2；
when a product to be detected moves to the position right below the third camera, the height of a third group of strip light sources (only one strip light source) is directly adjusted to 160mm, the third group of strip light sources are positioned right above the product to be detected and right below the third camera, the strip light sources are used for lighting, the position of the third camera is rotated, the glass product to be detected is imaged, an image with the maximum strip light spot width is found out, as shown in fig. 4, the camera rotation angle corresponding to the image is recorded, and the maximum length L in the formed image is obtained through calculation of image processing software3maxAnd the width W of the strip-shaped light spot3；
If W is1+ W2+ W3Greater than L1max、L2maxAnd L3maxAnd any one of the two components is used for detecting the subsequent product to be detected according to the positions of the components of the imaging device, otherwise, the positions of the components of the imaging device are continuously adjusted to meet the conditions. When the detection is carried out after the positions of all parts of the imaging device are adjusted according to the conditions, if defects exist, black characteristics such as black blocks, flower shapes, linear shapes and the like can appear in light spots in a product image.
The above-mentioned embodiments are merely illustrative of the technical idea and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the scope of the present invention, and all equivalent changes or modifications made according to the spirit of the present invention should be covered in the scope of the present invention.
Claims (7)
1. A defect detection method for mirror bowl-shaped structure products is characterized by comprising the following process steps:
(1) Placing a mirror bowl-shaped structure product to be detected on a bearing table, adjusting the positions of all cameras to ensure that all cameras are positioned right above the middle part of the product to be detected, and enabling one camera to correspond to one group of strip-shaped light sources;
(2) Each group of strip-shaped light sources is used for polishing in a time-sharing manner, and the corresponding cameras are used for imaging the product to be detected in sequence to obtain imaging results positioned at different positions on the surface of the product to be detected;
(3) And (3) adjusting the height of each group of strip-shaped light sources, continuously observing the imaging result of the product to be detected in the step (2) in the height adjusting process until the strip-shaped light spot effect is presented, adjusting the position of each group of strip-shaped light sources in the horizontal direction, performing width and length calculation on the strip-shaped light spot image imaged by the product to be detected in the adjusting process, ensuring that the sum of the widths of all the strip-shaped light spot images is greater than the maximum length of the strip-shaped light spot image, and finally observing whether black features exist in all the strip-shaped light spot images or not, and if the black features exist, judging.
2. the method of claim 1, wherein the step of detecting the defects comprises: the camera in the step (1) comprises a first camera, a second camera and a third camera, the first camera corresponds to the first group of strip light sources, the second camera corresponds to the second group of strip light sources, the third camera corresponds to the third group of strip light sources, the first group of strip light sources and the second group of strip light sources are provided with two strip light sources, and the third group of strip light sources is one strip light source.
3. The method of claim 2, wherein the step of detecting the defects comprises: one strip light source in the first group of strip light sources is arranged on one side of a first camera, and the first camera images a product to be detected to obtain an image of a strip light spot positioned at the edge of the product to be detected; and arranging another symmetrical strip-shaped light source on the other side of the first camera, imaging the product to be detected again, and obtaining images of two strip-shaped light spots respectively positioned on the two side edges of the product to be detected.
4. The method of claim 2, wherein the step of detecting the defects comprises: one strip light source in the second group of strip light sources is vertically arranged on one side of the second camera, and the second camera images a product to be detected to obtain an image of a strip light spot positioned at the middle part of the product to be detected, which is close to the middle part; and arranging another symmetrical strip-shaped light source on the other side of the second camera, and imaging the product to be detected again to obtain images of two strip-shaped light spots respectively close to the middle part of the product to be detected.
5. The method of claim 2, wherein the step of detecting the defects comprises: and one strip light source of the third group of strip light sources is fixed right above the middle part of the product to be detected, the strip light source is used for polishing, the third camera position is rotated, the product to be detected is imaged, the image with the maximum strip light spot width is found out, and the camera rotation angle corresponding to the image is recorded.
6. the method of claim 1, wherein the step of detecting the defects comprises: and (4) the height of each group of strip-shaped light sources in the step (3) is 160 mm.
7. The method of claim 1, wherein the step of detecting the defects comprises: the black features in the step (3) are specifically presented as black blocks, black flowers and black lines.
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Cited By (1)
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| CN114018934A (en) * | 2021-11-03 | 2022-02-08 | 四川启睿克科技有限公司 | Imaging system for detecting surface defects of arc-shaped metal |
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