CN112595727B - Imaging system and detection method for detecting defects of ink glass of rear cover plate of mobile phone - Google Patents
Imaging system and detection method for detecting defects of ink glass of rear cover plate of mobile phone Download PDFInfo
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- CN112595727B CN112595727B CN202110223417.4A CN202110223417A CN112595727B CN 112595727 B CN112595727 B CN 112595727B CN 202110223417 A CN202110223417 A CN 202110223417A CN 112595727 B CN112595727 B CN 112595727B
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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- G01N21/95—Investigating the presence of flaws or contamination characterised by the material or shape of the object to be examined
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
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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
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Abstract
The invention relates to an imaging system and a detection method for detecting ink glass defects of a rear cover plate of a mobile phone, wherein the imaging system comprises at least one linear array camera module; the linear array camera module comprises a linear array camera, a lens, a first linear light source and a second linear light source, wherein the linear array camera is fixedly arranged on the mounting bracket and is positioned above a product to be detected; the lens is correspondingly matched with the linear array camera, and the shooting central axis of the linear array camera is vertical to the upper surface of a product to be detected; the first linear light source and the second linear light source are both positioned at the same side of the linear array camera and irradiate the upper surface of a product to be detected; the first line light source forms an included angle alpha 1 with the upper surface of the product to be detected, and the second line light source forms an included angle alpha 2 with the upper surface of the product to be detected; the included angle alpha 1 is 65-75 degrees, and the included angle alpha 2 is 35-45 degrees. The defects of the transparent glass layer and the ink layer in the ink glass of the rear cover plate of the mobile phone can be shot simultaneously through the imaging system, so that the detection efficiency and the detection accuracy are greatly improved.
Description
Technical Field
The invention relates to the field of optical appearance detection, in particular to an imaging system and a detection method for detecting defects of ink glass of a rear cover plate of a mobile phone.
Background
With the development of science and technology, people's demand is increasing, and the mobile phone rear cover material is from the original plastics to the metal to the present glass material. The mobile phone rear cover made of glass is popular with people due to the unique aesthetic appearance; this necessarily affects the quality of the mobile phone product, since it inevitably causes defects in appearance after the production process and transportation. Therefore, appearance detection is an essential link.
At present, the detection means is mainly a manual visual detection mode, but the manual visual detection mode inevitably has the defects of inconsistent detection standards, low speed, low efficiency and the like, and is difficult to meet the actual industrial production requirements.
Although the system related to glass surface defect detection replaces manual glass detection, mainly aiming at three damage defects (such as scratch/crush/bruise) of transparent glass, the opaque ink glass material researched by the scheme causes high imaging difficulty, the ink glass is constructed into an upper layer and a lower layer, the upper layer is transparent glass (the defect is scratch/crush/bruise), the lower layer is color ink (the defect is heterochromatic/ink separation reflection), the prior art cannot consider the defects of the upper layer and the lower layer, and the detection rate of the ink separation reflection is low. Therefore, no good method for solving the imaging problem of the ink glass exists at present.
During manual visual inspection, the light source is fixed, the product needs to be shaken to carry out dynamic observation, and the time is about 30 seconds. The prior art is relatively static detection, and a large degree of missed detection exists.
Disclosure of Invention
The invention aims to provide an imaging system for detecting the defects of the ink glass of the rear cover plate of the mobile phone, which can shoot the defects on the transparent glass layer and the ink layer of the ink glass of the rear cover plate of the mobile phone by one-time picture collection, thereby greatly improving the detection efficiency and the detection accuracy.
The technical scheme for realizing the first purpose of the invention is as follows: the imaging system for detecting the defects of the ink glass on the rear cover plate of the mobile phone comprises at least one linear array camera module; the linear array camera module comprises a linear array camera, a lens, a first linear light source and a second linear light source, wherein the linear array camera is fixedly arranged on the mounting bracket and is positioned above a product to be detected; the lens is correspondingly matched with the linear array camera, and the shooting central axis of the linear array camera is vertical to the upper surface of a product to be detected; the first linear light source and the second linear light source are both positioned at the same side of the linear array camera and irradiate the upper surface of a product to be detected; the first line light source forms an included angle alpha 1 with the upper surface of the product to be detected, and the second line light source forms an included angle alpha 2 with the upper surface of the product to be detected; the included angle alpha 1 is 65-75 degrees, and the included angle alpha 2 is 35-45 degrees.
Meanwhile, the device also comprises a control unit; the control unit is used for controlling the linear array camera on the linear array camera module to shoot; each linear array camera is electrically connected with the control unit; the system also comprises a servo conveying mechanism which is used for driving the product to be detected to enter and pass through the image acquisition stations of the linear array camera modules; each linear array camera module is correspondingly provided with a position signal triggering module which is electrically connected with the control unit; the position signal trigger module is used for sensing that a product to be detected enters a corresponding image acquisition station of the linear array camera module, forming a trigger signal and transmitting the trigger signal to the control unit; the control unit controls the linear array camera on the corresponding linear array camera module to shoot and acquire pictures according to the trigger signal, and transmits shot and acquired pictures to a background computing center which can obtain detection results according to picture computation.
A plurality of linear array camera modules are sequentially arranged along the conveying direction of the servo conveying mechanism, and the number of the linear array camera modules is equal to the number of edges of a product to be detected; and each linear array camera module shoots and acquires images along the extending direction of different edges of the product to be detected.
As further optimization, four linear array camera modules are sequentially arranged along the conveying direction of the servo conveying mechanism, and each linear array camera module shoots and acquires images along the extending direction of four different edges of a product to be detected respectively.
The servo conveying mechanism comprises a rack, a turntable and a servo motor; the turntable is provided with at least one positioning tool for placing a product to be detected; the turntable is rotationally arranged on the rack, and the servo motor is fixedly arranged on the rack; an output shaft of the servo motor is in transmission connection with the rotary table, and the servo motor drives the rotary table to rotate under the control of the control unit; the four linear array camera modules are arranged around the turntable; when the product to be detected moves to the image acquisition station of the corresponding linear array camera module along with the turntable, the movement direction of the product to be detected is parallel to the extension direction of one edge of the product; the servo motor is electrically connected with the control unit.
A plurality of positioning tools are uniformly distributed on the turntable along the circumference of the rotation axis of the turntable.
The linear array camera is selected because the linear array camera has a large dynamic range and high sensitivity, and can be applied to continuous high-resolution imaging; the ink glass of the rear cover plate of the mobile phone is highly reflective, and the linear array camera can provide more polishing modes. In addition, the required resolution ratio is higher, so that the linear array camera is selected to improve the detection precision and the detection efficiency.
The linear light source is selected because the linear light source is an artificial light source formed by specially arranging the LED light sources on a high-density circuit board, has the characteristics of high brightness and high uniformity, and can ensure the light flux of each link and the uniformity of actual light beams. The matching of the two linear light sources has the function of respectively irradiating the surface of the object from a low angle to a high angle, so that the defects of different depths of the glass are clearly visible. Two linear light sources are selected for use, so that the problem of polishing ink glass can be solved.
The second objective of the present invention is to provide a detection method using the imaging system for detecting defects of ink glass on a rear cover of a mobile phone, which can obtain defects of a transparent glass layer and an ink layer on the ink glass of the rear cover of the mobile phone through one-time image capture, and can greatly improve detection efficiency and detection accuracy by adopting multi-angle image capture.
The technical scheme for realizing the second purpose of the invention is as follows: the detection method by using the imaging system for detecting the defects of the ink glass on the rear cover plate of the mobile phone comprises the following steps:
s1, feeding: with the rotation of the turntable, products to be detected are sequentially placed on a positioning tool of the turntable; when a product to be detected is placed on the positioning tool, the upper surface of the product is a transparent glass layer, and the lower surface of the product is an ink layer;
s2, enabling the product to be detected to enter a pattern picking station of a first linear array camera module along with the turntable, wherein when the product to be detected moves in the pattern picking station, the moving direction of the product to be detected is parallel to the extending direction of one edge of the product to be detected; the first linear array camera module shoots and acquires images of a product to be detected and sends shot and acquired pictures to the background computing center through the control unit;
s3, the product to be detected enters the image acquisition station of the second linear array camera module along with the turntable, and when the product to be detected moves in the image acquisition station, the product to be detected rotates ninety degrees compared with the position in the previous image acquisition station; the movement direction of the product to be detected in the image acquisition station is ninety degrees to the movement direction of the product to be detected in the previous image acquisition station; the second linear array camera module shoots and acquires images of the product to be detected and sends shot and acquired pictures to the background computing center through the control unit;
s4, enabling the product to be detected to enter a drawing station of a third linear array camera module along with the turntable, and when the product to be detected moves in the drawing station, rotating the product to be detected by ninety degrees compared with the position in the previous drawing station; the movement direction of the product to be detected in the image acquisition station is ninety degrees to the movement direction of the product to be detected in the previous image acquisition station; the third linear array camera module shoots and acquires images of the product to be detected and sends shot and acquired pictures to the background computing center through the control unit;
s5, enabling the product to be detected to enter a drawing station of a fourth linear array camera module along with the turntable, and enabling the product to be detected to rotate ninety degrees compared with the position in the previous drawing station when the product to be detected moves in the drawing station; the movement direction of the product to be detected in the image acquisition station is ninety degrees to the movement direction of the product to be detected in the previous image acquisition station; the fourth linear array camera module shoots and acquires images of the product to be detected and sends shot and acquired pictures to the background computing center through the control unit;
s6, the background computing center receives the pictures shot and collected by the four linear array camera modules, and defect identification and classification are carried out based on a deep learning algorithm, so that a detection result is obtained;
s7, blanking: and taking down the inspected product from the positioning tool according to the detection result, and sorting and classifying the inspected product.
As an optimized design, a plurality of positioning tools are uniformly distributed on the turntable along the circumference of the rotation axis of the turntable; along with the carousel rotates, a plurality of location frocks on the carousel synchronous entering next station.
The invention has the positive effects that: (1) the imaging system for detecting the defects of the ink glass of the rear cover plate of the mobile phone can take the defects of the upper transparent glass layer and the lower ink layer of the ink glass of the rear cover plate of the mobile phone into consideration, can be completed by one-time picture collection, and greatly improves the detection efficiency.
(2) According to the invention, the automatic detection of the workpiece to be detected can be realized through the control unit, the servo conveying mechanism and the position signal triggering module, so that the detection efficiency and the detection accuracy are greatly improved.
(3) According to the invention, the plurality of linear array camera modules can be used for acquiring images from multiple directions, and more accurate detection results can be obtained through calculation and comparison.
(4) The invention is generally rectangular according to the product to be detected (namely, the ink glass of the rear cover plate of the mobile phone), so that the four linear array camera modules are adopted to finish the image collection work of each angle.
(5) According to the universal servo conveying mechanism, the rotation of the product to be detected can be realized through the rotation of the turntable, so that a simpler and more effective mode is provided for multi-angle shooting on the premise of not moving the product to be detected.
(6) The detection method also realizes multi-angle image acquisition by utilizing the rotation of the turntable on the workpiece through cooperation, thereby greatly improving the detection efficiency and the detection accuracy.
Drawings
In order that the present disclosure may be more readily and clearly understood, reference is now made to the following detailed description of the present disclosure taken in conjunction with the accompanying drawings, in which
FIG. 1 is a schematic diagram of an imaging system for detecting ink glass defects on a rear cover plate of a mobile phone according to the present invention;
FIG. 2 is a schematic structural diagram of a servo conveying mechanism according to the present invention;
FIG. 3 is a schematic diagram of the electrical connections of the imaging system for detecting ink glass defects on the back cover of a mobile phone in accordance with the present invention;
FIG. 4 is a schematic structural diagram of a first line camera module according to the present invention;
FIG. 5 is a schematic structural diagram of a second linear array camera module according to the present invention;
FIG. 6 is a schematic structural diagram of a third linear array camera module according to the present invention;
FIG. 7 is a schematic structural diagram of a fourth linear array camera module according to the present invention;
FIG. 8 is a schematic view of a photograph taken with simultaneous illumination from a first line light source and a second line light source in accordance with the present invention;
FIG. 9 is a schematic view of a photograph taken under illumination from a first line source only in accordance with the present invention;
FIG. 10 is a schematic view of a photograph taken only under illumination of a second line source according to the present invention.
Detailed Description
(example 1)
Referring to fig. 1 to 3, the imaging system for detecting the defects of the ink glass of the rear cover plate of the mobile phone comprises four linear array camera modules 1; also comprises a control unit 2; the control unit 2 is used for controlling the linear array camera on the linear array camera module 1 to shoot; each linear array camera is electrically connected with the control unit 2; the automatic drawing machine also comprises a servo conveying mechanism 3 which is used for driving a product to be detected to enter and pass through the drawing station of each linear array camera module 1; the servo conveying mechanism 3 comprises a rack, a turntable 31, a servo motor 32 and a positioning tool 33; a plurality of positioning tools 33 for placing products to be detected are uniformly distributed on the turntable 31 along the circumference of the rotation axis of the turntable 31; the turntable 31 is rotatably arranged on the rack, and the servo motor 32 is fixedly arranged on the rack; an output shaft of the servo motor 32 is in transmission connection with the rotary table 31, and the servo motor 32 drives the rotary table 31 to rotate under the control of the control unit 2; the four linear array camera modules 1 are arranged around the rotary table 31 and are sequentially arranged along the conveying direction of the servo conveying mechanism 3, and when a product to be detected moves to a corresponding image acquisition station of the linear array camera module 1 along with the rotary table 31, the moving direction of the product to be detected is parallel to the extending direction of one edge of the product; each linear array camera module 1 respectively shoots and acquires images along the extending direction of four different edges of a product to be detected; the servo motor 32 is electrically connected to the control unit 2.
Referring to fig. 3, each line camera module 1 is correspondingly provided with a position signal trigger module 4, and the position signal trigger module 4 is electrically connected with the control unit 2; the position signal trigger module 4 is used for sensing that a product to be detected enters a corresponding image acquisition station of the linear array camera module 1, forming a trigger signal and transmitting the trigger signal to the control unit 2; the control unit 2 controls the corresponding linear array camera on the linear array camera module 1 to shoot and acquire pictures according to the trigger signal, and transmits the shot and acquired pictures to the background computing center 5 which can obtain a detection result according to picture computation.
The linear array camera module 1 comprises a linear array camera, a lens, a first linear light source and a second linear light source which are fixedly arranged on the mounting bracket and positioned above a product to be detected; the lens is correspondingly matched with the linear array camera (so-called corresponding matching, namely a shooting hole of the linear array camera is over against an image output end of the lens, an image input end of the lens is opposite to a product to be detected), and a shooting central axis of the linear array camera is vertical to the upper surface of the product to be detected; the first linear light source and the second linear light source are both positioned at the same side of the linear array camera and irradiate the upper surface of a product to be detected; the first line light source forms an included angle alpha 1 with the upper surface of the product to be detected, and the second line light source forms an included angle alpha 2 with the upper surface of the product to be detected.
The four linear array camera modules 1 are respectively a first linear array camera module, a second linear array camera module, a third linear array camera module and a fourth linear array camera module.
Referring to fig. 4, the first line camera module comprises a line camera b1, a lens, a first line light source a1 and a second line light source a 2; the included angle alpha 1 is 70 degrees, and the included angle alpha 2 is 40 degrees.
Referring to fig. 5, the second line camera module comprises a line camera b2, a lens, a first line light source a3 and a second line light source a 4; the included angle alpha 1 is 70 degrees, and the included angle alpha 2 is 40 degrees.
Referring to fig. 6, the third line camera module comprises a line camera b3, a lens, a first line light source a5 and a second line light source a 6; the included angle alpha 1 is 70 degrees, and the included angle alpha 2 is 40 degrees.
Referring to fig. 7, the fourth line camera module comprises a line camera b4, a lens, a first line light source a7 and a second line light source a 8; the included angle alpha 1 is 70 degrees, and the included angle alpha 2 is 40 degrees.
When only the first linear light sources a1, a3, a5 and a7 are used, the alpha 1 is between 65 and 75 degrees, the defects positioned on the bottom glass layer in the figure 9 can be shot out, but the surface layer cannot be matched. If α 1 is not between 65 ° and 75 °, the defects of the glass substrate cannot be completely expressed.
When only the second linear light sources a2, a4, a6 and a8 are used, alpha 2 is 35-45 degrees, the defects on the surface layer of the glass in the figure 10 can be shot out, but the defects cannot be matched with the bottom layer. If α 2 is not between 35 ° and 45 °, the defects of the glass surface layer cannot be completely expressed.
Through a large number of experiments, the defects of the glass surface layer and the glass bottom layer can be simultaneously shown only by using the combination of the first linear light sources a1, a3, a5 and a7 and the second linear light sources a2, a4, a6 and a8, wherein alpha 1 is 65-75 degrees, and alpha 2 is 35-45 degrees, as shown in fig. 8.
Wherein, the turntable 31 is rotationally connected on the frame through a bearing, the servo motor 32 is a universal part, and the technical personnel in the field can select and use the turntable according to the requirement; and the output shaft of the servo motor 32 is in transmission connection with the input end of the speed reducer, and the output end of the speed reducer is in transmission connection with the rotating disc 31. The position signal triggering module 4 is also a common component, and can generally adopt an angular displacement sensor, a Hall sensing arrangement mode, an infrared sensing device and the like. Since the position signal triggering module 4 is common in mechanical transmission, it will not be repeated here.
The detection method by using the imaging system for detecting the defects of the ink glass on the rear cover plate of the mobile phone comprises the following steps:
s1, feeding: with the rotation of the turntable 31, products to be detected are sequentially placed on the positioning tools 33 of the turntable 31; when a product to be detected is placed on the positioning tool 33, a transparent glass layer is arranged on the product, and an ink layer is arranged below the product; along with the rotation of the turntable 31, the plurality of positioning tools 33 on the turntable 31 synchronously enter the next station;
s2, the product to be detected enters a pattern picking station of the first linear array camera module along with the turntable 31, and when the product to be detected moves in the pattern picking station, the moving direction of the product to be detected is parallel to the extending direction of one edge of the product to be detected; the first linear array camera module shoots and acquires images of a product to be detected and sends shot and acquired pictures to the background computing center 5 through the control unit 2;
s3, the product to be detected enters the image acquisition station of the second linear array camera module along with the turntable 31, and when the product to be detected moves in the image acquisition station, the product to be detected rotates ninety degrees compared with the position in the previous image acquisition station; the movement direction of the product to be detected in the image acquisition station is ninety degrees to the movement direction of the product to be detected in the previous image acquisition station; the second linear array camera module shoots and acquires images of the product to be detected and sends shot and acquired pictures to the background computing center 5 through the control unit 2;
s4, the product to be detected enters the image acquisition station of the third linear array camera module along with the turntable 31, and when the product to be detected moves in the image acquisition station, the product to be detected rotates ninety degrees compared with the position in the previous image acquisition station; the movement direction of the product to be detected in the image acquisition station is ninety degrees to the movement direction of the product to be detected in the previous image acquisition station; the third linear array camera module shoots and acquires images of the product to be detected and sends shot and acquired pictures to the background computing center 5 through the control unit 2;
s5, the product to be detected enters the image acquisition station of the fourth linear array camera module along with the turntable 31, and when the product to be detected moves in the image acquisition station, the product to be detected rotates ninety degrees compared with the position in the previous image acquisition station; the movement direction of the product to be detected in the image acquisition station is ninety degrees to the movement direction of the product to be detected in the previous image acquisition station; the fourth linear array camera module shoots and acquires images of the product to be detected and sends shot and acquired pictures to the background computing center 5 through the control unit 2;
s6, the background computing center 5 receives the pictures shot and collected by the four linear array camera modules 1, and defect identification and classification are carried out based on a deep learning algorithm, so that a detection result is obtained;
s7, blanking: and taking down the inspected product from the positioning tool 33 according to the detection result, and sorting and classifying the inspected product.
(example 2)
The first linear array camera module comprises a linear array camera b1, a lens, a first linear light source a1 and a second linear light source a 2; the included angle alpha 1 is 65 degrees, and the included angle alpha 2 is 35 degrees.
The second line camera module comprises a line camera b2, a lens, a first line light source a3 and a second line light source a 4; the included angle alpha 1 is 65 degrees, and the included angle alpha 2 is 35 degrees.
The third line camera module comprises a line camera b3, a lens, a first line light source a5 and a second line light source a 6; the included angle alpha 1 is 65 degrees, and the included angle alpha 2 is 35 degrees.
The fourth line camera module comprises a line camera b4, a lens, a first line light source a7 and a second line light source a 8; the included angle alpha 1 is 65 degrees, and the included angle alpha 2 is 35 degrees.
Other technical features are the same as those of embodiment 1.
(example 3)
The first linear array camera module comprises a linear array camera b1, a lens, a first linear light source a1 and a second linear light source a 2; the included angle alpha 1 is 75 degrees, and the included angle alpha 2 is 45 degrees.
The second line camera module comprises a line camera b2, a lens, a first line light source a3 and a second line light source a 4; the included angle alpha 1 is 75 degrees, and the included angle alpha 2 is 45 degrees.
The third line camera module comprises a line camera b3, a lens, a first line light source a5 and a second line light source a 6; the included angle alpha 1 is 75 degrees, and the included angle alpha 2 is 45 degrees.
The fourth line camera module comprises a line camera b4, a lens, a first line light source a7 and a second line light source a 8; the included angle alpha 1 is 75 degrees, and the included angle alpha 2 is 45 degrees.
Other technical features are the same as those of embodiment 1.
(example 4)
The first linear array camera module comprises a linear array camera b1, a lens, a first linear light source a1 and a second linear light source a 2; the included angle alpha 1 is 65 degrees, and the included angle alpha 2 is 45 degrees.
The second line camera module comprises a line camera b2, a lens, a first line light source a3 and a second line light source a 4; the included angle alpha 1 is 65 degrees, and the included angle alpha 2 is 45 degrees.
The third line camera module comprises a line camera b3, a lens, a first line light source a5 and a second line light source a 6; the included angle alpha 1 is 65 degrees, and the included angle alpha 2 is 45 degrees.
The fourth line camera module comprises a line camera b4, a lens, a first line light source a7 and a second line light source a 8; the included angle alpha 1 is 65 degrees, and the included angle alpha 2 is 45 degrees.
Other technical features are the same as those of embodiment 1.
(example 5)
The first linear array camera module comprises a linear array camera b1, a lens, a first linear light source a1 and a second linear light source a 2; the included angle alpha 1 is 75 degrees, and the included angle alpha 2 is 35 degrees.
The second line camera module comprises a line camera b2, a lens, a first line light source a3 and a second line light source a 4; the included angle alpha 1 is 75 degrees, and the included angle alpha 2 is 35 degrees.
The third line camera module comprises a line camera b3, a lens, a first line light source a5 and a second line light source a 6; the included angle alpha 1 is 75 degrees, and the included angle alpha 2 is 35 degrees.
The fourth line camera module comprises a line camera b4, a lens, a first line light source a7 and a second line light source a 8; the included angle alpha 1 is 75 degrees, and the included angle alpha 2 is 35 degrees.
Other technical features are the same as those of embodiment 1.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. The utility model provides an imaging system for detecting cell-phone back shroud printing ink glass defect which characterized in that: comprises at least one line camera module; the linear array camera module comprises a linear array camera, a lens, a first linear light source and a second linear light source, wherein the linear array camera is fixedly arranged on the mounting bracket and is positioned above a product to be detected; the lens is correspondingly matched with the linear array camera, and the shooting central axis of the linear array camera is vertical to the upper surface of a product to be detected; the first linear light source and the second linear light source are both positioned at the same side of the linear array camera and irradiate the upper surface of a product to be detected; the first line light source forms an included angle alpha 1 with the upper surface of the product to be detected, and the second line light source forms an included angle alpha 2 with the upper surface of the product to be detected; the included angle alpha 1 is 65-75 degrees, and the included angle alpha 2 is 35-45 degrees.
2. The imaging system for detecting ink glass defects on a back cover plate of a mobile phone according to claim 1, wherein: also includes a control unit; the control unit is used for controlling the linear array camera on the linear array camera module to shoot; each linear array camera is electrically connected with the control unit;
the system also comprises a servo conveying mechanism which is used for driving the product to be detected to enter and pass through the image acquisition stations of the linear array camera modules;
each linear array camera module is correspondingly provided with a position signal triggering module which is electrically connected with the control unit; the position signal trigger module is used for sensing that a product to be detected enters a corresponding image acquisition station of the linear array camera module, forming a trigger signal and transmitting the trigger signal to the control unit; the control unit controls the linear array camera on the corresponding linear array camera module to shoot and acquire pictures according to the trigger signal, and transmits shot and acquired pictures to a background computing center which can obtain detection results according to picture computation.
3. The imaging system for detecting ink glass defects on a back cover plate of a mobile phone according to claim 2, wherein: a plurality of linear array camera modules are sequentially arranged along the conveying direction of the servo conveying mechanism, and the number of the linear array camera modules is equal to the number of edges of a product to be detected; and each linear array camera module shoots and acquires images along the extending direction of different edges of the product to be detected.
4. The imaging system for detecting ink glass defects on a back cover plate of a mobile phone according to claim 3, wherein: four linear array camera modules are sequentially arranged along the conveying direction of the servo conveying mechanism, and each linear array camera module is used for shooting and picking images along the extending direction of four different edges of a product to be detected respectively.
5. The imaging system for detecting ink glass defects on a back cover plate of a mobile phone according to claim 4, wherein: the servo conveying mechanism comprises a rack, a turntable and a servo motor; the turntable is provided with at least one positioning tool for placing a product to be detected; the turntable is rotationally arranged on the rack, and the servo motor is fixedly arranged on the rack; an output shaft of the servo motor is in transmission connection with the rotary table, and the servo motor drives the rotary table to rotate under the control of the control unit; the four linear array camera modules are arranged around the turntable; when the product to be detected moves to the image acquisition station of the corresponding linear array camera module along with the turntable, the movement direction of the product to be detected is parallel to the extension direction of one edge of the product; the servo motor is electrically connected with the control unit.
6. The imaging system for detecting ink glass defects on a back cover plate of a mobile phone according to claim 5, wherein: and a plurality of positioning tools are uniformly distributed on the turntable along the circumference of the rotation axis of the turntable.
7. The detection method by using the imaging system for detecting the ink glass defect of the rear cover plate of the mobile phone as claimed in claim 5, is characterized by comprising the following steps:
s1, feeding: with the rotation of the turntable, products to be detected are sequentially placed on a positioning tool of the turntable; when a product to be detected is placed on the positioning tool, the upper surface of the product is a transparent glass layer, and the lower surface of the product is an ink layer;
s2, enabling the product to be detected to enter a pattern picking station of a first linear array camera module along with the turntable, wherein when the product to be detected moves in the pattern picking station, the moving direction of the product to be detected is parallel to the extending direction of one edge of the product to be detected; the first linear array camera module shoots and acquires images of a product to be detected and sends shot and acquired pictures to the background computing center through the control unit;
s3, the product to be detected enters the image acquisition station of the second linear array camera module along with the turntable, and when the product to be detected moves in the image acquisition station, the product to be detected rotates ninety degrees compared with the position in the previous image acquisition station; the movement direction of the product to be detected in the image acquisition station is ninety degrees to the movement direction of the product to be detected in the previous image acquisition station; the second linear array camera module shoots and acquires images of the product to be detected and sends shot and acquired pictures to the background computing center through the control unit;
s4, enabling the product to be detected to enter a drawing station of a third linear array camera module along with the turntable, and when the product to be detected moves in the drawing station, rotating the product to be detected by ninety degrees compared with the position in the previous drawing station; the movement direction of the product to be detected in the image acquisition station is ninety degrees to the movement direction of the product to be detected in the previous image acquisition station; the third linear array camera module shoots and acquires images of the product to be detected and sends shot and acquired pictures to the background computing center through the control unit;
s5, enabling the product to be detected to enter a drawing station of a fourth linear array camera module along with the turntable, and enabling the product to be detected to rotate ninety degrees compared with the position in the previous drawing station when the product to be detected moves in the drawing station; the movement direction of the product to be detected in the image acquisition station is ninety degrees to the movement direction of the product to be detected in the previous image acquisition station; the fourth linear array camera module shoots and acquires images of the product to be detected and sends shot and acquired pictures to the background computing center through the control unit;
s6, the background computing center receives the pictures shot and collected by the four linear array camera modules, and defect identification and classification are carried out based on a deep learning algorithm, so that a detection result is obtained;
s7, blanking: and taking down the inspected product from the positioning tool according to the detection result, and sorting and classifying the inspected product.
8. The detection method according to claim 7, characterized by comprising the steps of: a plurality of positioning tools are uniformly distributed on the rotary table along the circumference of the rotary axis of the rotary table; along with the carousel rotates, a plurality of location frocks on the carousel synchronous entering next station.
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| CN113245241B (en) * | 2021-06-17 | 2022-08-12 | 苏州中科行智智能科技有限公司 | Glass slide defect detection method based on machine vision |
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