CN214211370U - Detection system and sorter based on time-sharing coaxial illumination imaging - Google Patents
Detection system and sorter based on time-sharing coaxial illumination imaging Download PDFInfo
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- CN214211370U CN214211370U CN202022508838.5U CN202022508838U CN214211370U CN 214211370 U CN214211370 U CN 214211370U CN 202022508838 U CN202022508838 U CN 202022508838U CN 214211370 U CN214211370 U CN 214211370U
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Abstract
The utility model provides a detecting system and sorter based on coaxial illumination formation of image of timesharing formula, include: the image acquisition unit is used for acquiring a product image; the shading body is a matte metal box body subjected to black spraying treatment; the mirror surface of the semi-transparent semi-reflective spectroscope is plated with an optical coating film with the reflectivity and the transmissivity of 50 percent, and the optical coating film is used for changing the transmission direction of the emergent light of the light source module and transmitting the reflected light reflected by the surface of the object to be measured; several groups of light source modules are used to provide time-sharing light source; the light source module driving unit outputs pulse width modulation signals to drive the light source modules, each group of light source modules are respectively lightened once in each clock period, the problem that mirror reflection objects to be detected are prone to being missed and mistakenly detected due to the fact that the surfaces of the existing detection systems are smooth is solved, meanwhile, a plurality of groups of systems of image data under different-angle illumination are collected, the contrast ratio of defects and backgrounds is increased, and missed detection or mistaken detection caused by the randomness of surface flaws of the objects to be detected are greatly reduced.
Description
Technical Field
The utility model relates to a machine vision detects technical field, especially relates to a detecting system who is applicable to the coaxial illumination formation of image of timesharing formula that specular reflection determinand appears easily.
Background
Machine vision inspection technology is showing people in all industries by using different light sources, cameras, signal processing systems and rejection systems. The basic principle of different machine vision detection systems is similar, namely, the light sources with different wave bands are used for illuminating an object to be detected, reflected light or transmitted light of the object to be detected is imaged on a camera sensor with a selected wave band through a selected lens, the camera transmits acquired data to a data processing system through analog-to-digital conversion, the processing system marks a target object meeting or not meeting conditions through a set judgment algorithm and transmits target object position information to a rejection system for processing, the method can better detect flaw information, surface color information or size, thickness and the like of the object to be detected, but when surface flaw detection is carried out on the objects to be detected with smooth surfaces and easy mirror reflection, such as glass, smooth plastic sheets, metal plates and other objects to be detected, if the illumination imaging angle is not good, the final image contrast is not high, the flaw information of the surface of the object to be detected can not be highlighted, so that the problems of missing detection or false detection can be caused.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a detecting system based on coaxial illumination formation of image of timesharing formula has solved current detecting system and has appeared leaking the problem of examining and the false retrieval easily to the smooth easy appearance specular reflection determinand that appears of surface, gathers the system of the image data under the different angle illumination of multiunit simultaneously, increases defect and background contrast, has significantly reduced because the hourglass of determinand surface flaw randomness cause examines or the false retrieval.
In order to achieve the above object, the technical solution of the present invention is specifically realized as follows:
the utility model discloses a detecting system based on timesharing formula coaxial illumination formation of image on one hand, including image acquisition unit, anti-dazzling body, semi-transparent semi-reflecting spectroscope, light source module drive unit, wherein, image acquisition unit is used for gathering the product image; the shading body is a matte metal box body subjected to black spraying treatment; the mirror surface of the semi-transparent semi-reflective spectroscope is plated with an optical coating film with the reflectivity and the transmissivity of 50 percent, and the optical coating film is used for changing the transmission direction of the emergent light of the light source module and transmitting the reflected light reflected by the surface of the object to be measured; the plurality of groups of light source modules are used for providing time-sharing light sources; the light source module driving unit outputs pulse width modulation signals to drive the plurality of light source modules, and each group of light source modules are respectively lightened once in each clock period.
Further, the light source module comprises an LED light bar and a cylindrical lens, wherein the LED light bar is provided with a lamp bead for providing a light source; the cylindrical lens is used for shaping and condensing the light rays emitted by the LED lamp strip.
Further, the image acquisition unit comprises at least one industrial camera.
Further, the sensor of the industrial camera is a linear CCD or CMOS of a selected wave band.
Further, the LED lamp strip is driven in a constant current driving mode.
Furthermore, the number of times of collecting images by the image collecting unit in each clock period is the same as the number of the groups of the light source modules.
Further, the light source module driving unit comprises a CPLD device.
Another aspect of the present invention discloses a sorting machine, comprising any one of the above-mentioned detecting systems based on time-sharing coaxial illumination imaging.
The beneficial technical effects are as follows:
1. the utility model discloses a detecting system based on time-sharing coaxial illumination imaging, which comprises an image acquisition unit, a shading body, a semi-transparent semi-reflective spectroscope, a light source module and a light source module driving unit, wherein the image acquisition unit is used for acquiring a product image; the shading body is a matte metal box body subjected to black spraying treatment; the mirror surface of the semi-transparent semi-reflective spectroscope is plated with an optical coating film with the reflectivity and the transmissivity of 50 percent, and the optical coating film is used for changing the transmission direction of the emergent light of the light source module and transmitting the reflected light reflected by the surface of the object to be measured; the plurality of groups of light source modules are used for providing time-sharing light sources; the light source module driving unit outputs pulse width modulation signals to drive the light source modules, each group of light source modules are respectively lightened once in each clock period, and a system for acquiring a plurality of groups of image data under different-angle illumination is used for increasing the contrast ratio of defects and backgrounds, so that the problem that the existing detection system is easy to miss-detect and miss-detect for the object to be detected due to mirror reflection easily occurring on the smooth surface is solved, and miss-detect or miss-detect caused by the randomness of the surface flaws of the object to be detected is greatly reduced;
2. the utility model discloses in, light source module drive unit output pulse width modulation signal drive is a plurality of in every clock cycle, every group the light source module is lighted once respectively, and the technique is lighted in LED light source timesharing, reduces owing to the hourglass of causing of the randomness of determinand surface flaw is examined or the false retrieval.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings used in the description of the embodiments will be briefly described below.
Fig. 1 is a schematic structural diagram of a detection system based on time-sharing coaxial illumination imaging according to the present invention;
fig. 2 is a front view of a detection system based on time-sharing coaxial illumination imaging according to the present invention;
fig. 3 is a top view of a detection system based on time-sharing coaxial illumination imaging according to the present invention;
fig. 4 is a schematic structural diagram of the detection system based on time-sharing coaxial illumination imaging applied to a vertical sorting machine according to the present invention;
FIG. 5 is a schematic diagram of a light source module driving module sending out PWM signals to control a plurality of light source modules;
fig. 6 is a flowchart of a detection system based on time-sharing coaxial illumination imaging.
The system comprises an image acquisition unit, a 2-light shielding body, a 3-semi-transparent semi-reflective spectroscope, a 4-light source module, a 41-LED lamp bar, a 42-cylindrical lens, a 5-light source module driving unit, a 6-second group of light source modules, a 7-third group of light source modules, an 8-feeding device, a 9-slideway, a 10-good product, a 11-defective product, a 12-three-color background lamp, a 14-rejecting device, a 15-waste hopper and a 16-good product hopper.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
In the coaxial illumination technology, light emitted by the LED white light source is integrally condensed by the cylindrical lens and is emitted from the emergent surface of the cylindrical lens in a manner of approaching parallel light, and the parallel light is emitted by the cylindrical lens
The angle of 45 degrees is incident to the half-transparent half-reflecting mirror, and the incident light ray and the normal line form an included angle
And when the reflected light passes through the semi-transparent semi-reflecting mirror, part of the light directly penetrates through the semi-transparent semi-reflecting mirror, a lens at a receiving end images the light on a camera sensor, and at the moment, the camera transmits a digital signal to a signal processing system through analog-to-digital conversion. The signal processing system judges whether the object to be measured has flaws after image processing and image recognition according to a set image processing algorithm, if the flaws exist, a command is sent to the grading system to finish grading of defective products, if the surface of the object to be measured is smooth and flat, incident light coincides with a normal line according to a light reflection law, the incident angle is equal to 0 degree, the reflection angle is equal to the incident angle and is also 0 degree, the reflection light exits along the direction of the incident light, the image shot by the camera is a uniform bright-field image, if flaws such as stains and scratches appear on the surface of the object to be measured, when the parallel light reaches the surface of the object to be measured, diffuse reflection is generated at the flaws, mirror reflection is generated at the positions without flaws, the image shot by the camera is in an uneven state, the positions with flaws are darker, and the positions without flaws are brighter.
In the detection of common flat surface products, because surface flaws have randomness, it is difficult to find a proper illumination angle for illumination imaging to increase contrast, and the use of a uniform surface light source also results in the homogenization of defect characteristics and the low contrast ratio between the presented defect and the background.
In view of the above problems, the present invention discloses a detection system based on time-sharing coaxial illumination imaging, referring to fig. 1-3, the detection system based on time-sharing coaxial illumination imaging comprises an image acquisition unit 1, a light shielding body 2, a semi-transparent semi-reflective spectroscope 3, a light source module 4 and a light source module driving unit 5, wherein, the image acquisition unit 1 is used for acquiring the product image, preferably, the image acquisition unit 1 at least comprises an industrial camera, the industrial camera comprises a lens for imaging in a selected wave band, a camera sensor of the industrial camera is a linear array CCD or CMOS in the selected wave band, the industrial camera for imaging is arranged at equal intervals, according to different use requirements, lenses with different focal lengths are arranged, so that the camera working distance, the camera vision and the like meet the requirements, and the number of times of acquiring images by the image acquisition unit 1 in each clock period is the same as the number of the light source modules 4; the light shading body 2 is a matte metal box body subjected to black spraying treatment; the mirror surface of the semi-transparent semi-reflective spectroscope 3 is coated with an optical coating film with the reflectivity and the transmissivity of 50 percent, and the optical coating film is used for changing the transmission direction of emergent light of the light source module 4 and transmitting reflected light reflected by the surface of an object to be measured; the light source modules 4 comprise a plurality of groups, the plurality of groups of light source modules 4 are used for providing time-sharing light sources, preferably, the light source modules comprise LED light bars 41 and cylindrical lenses 42, wherein the LED light bars 41 are provided with lamp beads for providing light sources, and the LED light bars are driven in a constant current mode to ensure the brightness consistency and the service life of the LED light bars; the cylindrical lens 42 is used for shaping and collecting light rays emitted by the LED lamp strip 41, so that the emergent light rays approach parallel light while the brightness is improved; the light source module driving unit 5 comprises a CPLD device and generates PWM waves, the light source module driving unit 5 outputs pulse width modulation signals to drive the plurality of light source modules 4, and each group of light source modules 4 is lighted once in each clock cycle, specifically, referring to fig. 5, when a first group of light bars, namely, a high level, are lighted, and a second group and a third group of light bars are not lighted at a low level; at the next moment, the second group of light bars are lightened, namely, the second group of light bars are lightened at a high level, and the first group of light bars and the third group of light bars are lightened out; similarly, the third group of light bars is high level, and the first group and the second group of light bars are at low level and are not lighted, namely only one group of lights are lighted at each time. When the CPLD device sends a first camera trigger signal, the first group of LED lamp strips are lightened, so that a product image at the illumination angle is acquired, each group of lamp strips are lightened once in each clock cycle, the camera is exposed for 3 times respectively and is respectively at different observation angles, the line of data at different illumination angles is obtained, and if the PWM signal frequency is 21KHZ, the real line frequency of a single camera is 7 KHZ.
The utility model discloses a detection system based on time-sharing coaxial illumination imaging, which can be applied to a vertical sorting machine, but not limited to, a vertical sorting machine, and also a crawler-type sorting machine, referring to fig. 4, the material feeding device 8 comprises a high-frequency vibrator and a material feeding hopper, so that the material fed into the material feeding hopper can be uniformly discharged without adhesion, 9 is a slideway, the flat plate type slideway or the rice channel type slideway can be selected and matched according to different materials to provide the support and the sliding direction for the materials, when material enters the detection system based on time-sharing coaxial imaging illumination from the slideway, the RGB three-color background lamp 12 is used for providing a background signal which is different from a foreground signal, when a material to be detected passes through a viewpoint, the LED lamp strips in the first group of light source modules 4 are lightened at a high level, and after the material passes through the cylindrical lens for shaping and light gathering, the industrial camera is triggered at the same time to collect the reflected light of the material; at the next moment, white light emitted by the LED lamp bars in the second group of light source modules 6 is condensed through the shaping of the cylindrical lens and is reflected to the surface of the material at the viewpoint through the semi-transparent semi-reflective mirror 3, and the reflected light is received by a sensor of the industrial camera through the semi-transparent semi-reflective mirror 3 by the surface of the material; at the next moment, when the high level of the LED light bar in the third group of light source modules 7 is lighted, the industrial camera 6 collects the reflected light on the surface of the material, all three groups of data are transmitted to the signal processing module, the three groups of data respectively correspond to the reflected light information on the surface of the material to be detected under the illumination of three different angles, and the removing device 14 is a high-frequency blow valve and is used for changing the motion track of defective products, so that the defective products enter the waste hopper 15, and the defective products are not processed and automatically fall into the defective product hopper 16.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above embodiments are only intended to describe the preferred embodiments of the present invention, but not to limit the scope of the present invention, and various modifications and improvements made by the technical solutions of the present invention by those skilled in the art should fall within the protection scope defined by the claims of the present invention without departing from the design spirit of the present invention.
Claims (8)
1. A detection system based on time-sharing coaxial illumination imaging is characterized by comprising:
the image acquisition unit (1) is used for acquiring a product image;
the light shielding body (2), the light shielding body (2) is a matte metal box body subjected to black spraying treatment;
the light source module comprises a semi-transparent semi-reflective spectroscope (3), wherein the mirror surface of the semi-transparent semi-reflective spectroscope (3) is plated with an optical coating film with the reflectivity and the transmissivity of 50% for changing the transmission direction of emergent light of the light source module (4) and transmitting reflected light reflected by the surface of an object to be measured;
the light source modules (4), a plurality of groups of the light source modules (4) are used for providing time-sharing light sources;
the light source module driving unit (5) outputs pulse width modulation signals to drive the light source modules (4), and each group of light source modules (4) are respectively lighted once in each clock period.
2. The detection system based on time-sharing coaxial illumination imaging according to claim 1, wherein the light source module (4) comprises:
the LED lamp strip (41), wherein a lamp bead is arranged on the LED lamp strip (41) and is used for providing a light source;
and the cylindrical lens (42) is used for shaping and condensing the light emitted by the LED light bar (41).
3. The detection system based on time-sharing coaxial illumination imaging according to claim 1, characterized in that the image acquisition unit (1) comprises at least one industrial camera.
4. The time-sharing coaxial illumination imaging-based detection system according to claim 3, wherein the sensor of the industrial camera is a selected waveband linear CCD or CMOS.
5. The detection system based on time-sharing coaxial illumination imaging is characterized in that the LED lamp bar (41) is driven in a constant-current driving mode.
6. The detection system based on time-sharing coaxial illumination imaging is characterized in that the number of times of acquiring images by the image acquisition unit (1) in each clock cycle is the same as that of the groups of the light source modules (4).
7. The detection system based on time-sharing coaxial illumination imaging according to claim 1, wherein the light source module driving unit (5) comprises a CPLD device.
8. A sorter comprising a time-sharing coaxial illumination imaging based detection system as claimed in any one of claims 1 to 7.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114453262A (en) * | 2021-12-20 | 2022-05-10 | 苏州镁伽科技有限公司 | Method and device for detecting device, storage medium and detection equipment |
| CN114815280A (en) * | 2022-06-29 | 2022-07-29 | 深圳市信润富联数字科技有限公司 | Method and system for multi-faceted focused imaging |
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2020
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114453262A (en) * | 2021-12-20 | 2022-05-10 | 苏州镁伽科技有限公司 | Method and device for detecting device, storage medium and detection equipment |
| CN114453262B (en) * | 2021-12-20 | 2023-12-15 | 苏州镁伽科技有限公司 | Method, apparatus, storage medium and detection device for detecting device |
| CN114815280A (en) * | 2022-06-29 | 2022-07-29 | 深圳市信润富联数字科技有限公司 | Method and system for multi-faceted focused imaging |
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