CN111443040A - Imaging system and method for laser coding etching mark on surface of light-reflecting and light-transmitting composite material - Google Patents
Imaging system and method for laser coding etching mark on surface of light-reflecting and light-transmitting composite material Download PDFInfo
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- CN111443040A CN111443040A CN202010409344.3A CN202010409344A CN111443040A CN 111443040 A CN111443040 A CN 111443040A CN 202010409344 A CN202010409344 A CN 202010409344A CN 111443040 A CN111443040 A CN 111443040A
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- 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
- G01N21/01—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
- 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
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Abstract
The invention provides an imaging system and method for laser coding etching marks on the surface of a light-reflecting and light-transmitting composite material. For imaging of laser coding etching marks on the surface of a light-reflecting and light-transmitting composite material, the difficulties of unclear imaging on the surface of the light-transmitting material, incongruity in imaging on the surface of the light-transmitting and light-reflecting material and the like exist. The core idea of the invention is to image the etching trace on the surface of the reflective material by using diffuse reflection light on the front surface, image the etching trace on the surface of the transparent material by using diffuse reflection light on the back surface, and image the laser coding etching trace by improving the background contrast of the transparent area. The surface of the object to be measured is irradiated by the front main light source, the light-transmitting area is irradiated by the back modulated light source, and finally, clear imaging of the surface of the composite material is obtained by the image receiving device. The invention can clear the laser coding information on the surface of the imaging composite material and has the advantages of simple system and high integration level.
Description
Technical Field
The invention particularly relates to an imaging system and method for laser coding etching marks on the surface of a light-reflecting and light-transmitting composite material.
Background
The imaging of the surface of the light-reflecting material and the imaging of the surface of the light-transmitting material are widely applied in the fields of machine vision detection and the like, and meanwhile, the compound imaging of the surfaces of the light-transmitting material and the light-reflecting material is also widely concerned due to the characteristics of more practical requirements, high implementation difficulty and the like. In surface detection in the field of machine vision, flaw detection, barcode detection and the like are mostly surface detection of a single light-transmitting material and a single light-reflecting material, and with further development of market demands, surface detection of a non-single attribute material has an increasingly important meaning in practical application. The clear imaging of the surface of the light-transmitting and light-reflecting material is obtained, so that the practical application of the machine vision detection field is greatly promoted, and the current main method is mainly a multi-imaging mode, namely, the single imaging is respectively carried out on the light-reflecting material and the light-transmitting material. However, multiple imaging means that imaging stations are increased, so that the product cost is increased, and the fusion processing of subsequent image data generated by multiple imaging also increases the complexity and difficulty of a machine vision algorithm. Therefore, how to solve the problem of imaging the surfaces of the light-reflecting and light-transmitting materials by single imaging is of great significance to the development of machine vision surface detection products.
Surface imaging involving light reflecting and light transmitting materials using multiple imaging is a solution, i.e. each imaging is dedicated to solving surface imaging of light reflecting or light transmitting materials, but there are several problems: 1. the difficulty of image processing increases: multiple imaging means multiple images, and in order to obtain overall information, the obtained images need to be subjected to fusion processing, which increases the difficulty in subsequent image processing. 2. The product cost increases: multiple imaging increases the number of imaging devices, which increases the production cost for the molded product. 3. The product complexity increases: multiple imaging requirements increase the imaging stations, thereby increasing the structural complexity and bulk of the final product.
Therefore, there is a need for an imaging system and method for laser coding etching on the surface of a light-reflecting and light-transmitting composite material to solve the above problems.
Disclosure of Invention
The invention aims to provide an imaging system and an imaging method for laser coding etching marks on the surface of a light-reflecting and light-transmitting composite material, aiming at overcoming the defects of the prior art.
In order to meet the requirements, the technical scheme adopted by the invention is as follows: the imaging system for the laser coding etching mark on the surface of the light-reflecting and light-transmitting composite material comprises the following modules:
an image acquisition device for taking an image of an object;
the main light source is used for integrally illuminating the object to be detected so as to highlight the characteristic information of the object to be detected;
the auxiliary light source is used for complementing illumination on the object to be detected so that the characteristic information of the object to be detected is richer;
and the barrier device is used for modulating the auxiliary light source.
The imaging method of the laser coding etching mark on the surface of the light-reflecting and light-transmitting composite material comprises the following steps:
s1: sequentially arranging an auxiliary light source, a fence device, an object to be detected and image acquisition equipment according to the position sequence, and arranging a main light source at the side of the image acquisition equipment;
s2: placing a resolution plate on the surface of the object to be detected;
s3: adjusting the image acquisition equipment to enable imaging to be clear;
s4: irradiating the main light source onto the object to be measured;
s5: the diffuse reflection light of the etching mark in the light reflection area of the object to be detected enters the image acquisition equipment and is displayed in the image acquisition equipment;
s6: the light irradiated on the etching mark of the light-transmitting part penetrates through the object to be detected;
s7: and after passing through the fence device, light emitted by the auxiliary light source irradiates a light-transmitting area of the object to be detected to be etched, and the image acquisition equipment receives and displays diffuse reflection light of the object to be detected.
The imaging system and the method for the laser coding etching mark on the surface of the light-reflecting and light-transmitting composite material have the advantages that:
the invention utilizes the illumination characteristics of the reflective material and the light-transmitting material, respectively obtains the surface information of the reflective material and the light-transmitting material through the light sources with different attributes, and the two light sources are not interfered with each other, thereby obtaining clear and accurate surface images. The invention has the characteristics of simple system, high integration level and the like, and also comprises the idea of introducing a special light source through a simple fence device, thereby providing a new and simplified design idea for the composite imaging of the light-transmitting material and the light-reflecting material.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:
fig. 1 schematically shows a schematic structural diagram of an imaging system for laser coding etching on the surface of a light-reflecting and light-transmitting composite material according to an embodiment of the application.
Fig. 2 schematically shows a structural diagram of a barrier device of an imaging system for laser coding etching on the surface of a light-reflecting and light-transmitting composite material according to an embodiment of the application.
Fig. 3 schematically shows a flow chart of an imaging method for laser coding etching on the surface of the light-reflecting and light-transmitting composite material according to an embodiment of the application.
Wherein: 1. an image acquisition device; 2. a primary light source; 3. an auxiliary light source; 4. a barrier device; 5. and (5) preparing a sample.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be described in further detail with reference to the accompanying drawings and specific embodiments.
In the following description, references to "one embodiment," "an embodiment," "one example," "an example," etc., indicate that the embodiment or example so described may include a particular feature, structure, characteristic, property, element, or limitation, but every embodiment or example does not necessarily include the particular feature, structure, characteristic, property, element, or limitation. Moreover, repeated use of the phrase "in accordance with an embodiment of the present application" although it may possibly refer to the same embodiment, does not necessarily refer to the same embodiment.
Certain features that are well known to those skilled in the art have been omitted from the following description for the sake of simplicity.
According to an embodiment of the present application, there is provided an imaging system for laser coding etching marks on a surface of a light-reflecting and light-transmitting composite material, as shown in fig. 1-2, including the following modules:
the image acquisition equipment 1 is used for shooting an image of an object and comprises an imaging main lens and a CCD sensor, wherein the main lens and the sensor need to keep strict F number matching;
the main light source 2 is used for integrally illuminating the object to be detected so as to highlight the characteristic information of the object to be detected, consists of a COB light source, forms a horizontal 45-degree included angle with the surface of the object to be detected, and has a small elevation angle in the vertical direction, so that the image receiving device receives more information carried by surface reflection light while illuminating the surface of the reflective material;
the auxiliary light source 3 is used for complementing illumination to the object to be detected to make the characteristic information of the object to be detected richer, is composed of a COB light source, is parallel to the surface of the object to be detected, and irradiates the surface of the light-transmitting material to complement reflected light on the surface of the light-transmitting material;
and the fence device 4 is used for modulating the auxiliary light source, is placed between the back auxiliary light source module and the object to be detected and is parallel to the light source surface and the surface of the object to be detected, and the fence module consists of light reflecting rectangular strips at equal intervals, wherein the intervals between every two long strips are equal and equal to the width of the long strips, and is used for modulating the back auxiliary light source into special light through the light of the back auxiliary light source so as to more fully irradiate the surface of the light-transmitting material.
According to an embodiment of the application, the image acquisition device 1, the main light source 2, the auxiliary light source 3 and the barrier device 4 of the imaging system for laser coding and etching on the surface of the light-reflecting and light-transmitting composite material are all arranged above the base device, and the base device is used for carrying out position adjustment on the image acquisition device 1, the main light source 2, the auxiliary light source 3 and the barrier device 4.
According to an embodiment of the present application, the base device at the bottom of the image capturing device 1 of the imaging system for laser coding etching on the surface of the light-reflecting and light-transmitting composite material is used for adjusting the image capturing device 1 in the transverse direction, the longitudinal direction and the front-back direction.
According to one embodiment of the application, the main light source 2 of the imaging system for laser coding etching marks on the surface of the light-reflecting and light-transmitting composite material is positioned at the side of the image acquisition equipment 1,
according to one embodiment of the application, the fence device 4 of the imaging system for laser coding etching marks on the surface of the light-reflecting and light-transmitting composite material is positioned between the auxiliary light source 3 and the object to be detected 5, and the object to be detected 5 is positioned between the fence device 4 and the image acquisition equipment 1.
According to an embodiment of the application, this imaging system's of reflection of light printing opacity combined material surface laser coding etching the light emitting area of auxiliary light source 3 with wait to examine the object 5 the face parallel that awaits measuring, just wait to examine the light transmission area of object 5 and be located the intermediate position of the illumination of auxiliary light source 3 light emitting area.
According to one embodiment of the application, the light-transmitting area of the surface to be detected of the object 5 of the imaging system for laser coding etching marks on the surface of the light-reflecting and light-transmitting composite material is flush with the center of the fence device 4.
According to an embodiment of the present application, the imaging system for laser coding etching marks on the surface of the light-reflecting and light-transmitting composite material further comprises a resolution plate disposed on the surface of the object 5 to be measured.
According to an embodiment of the present application, the imaging system for laser coding etching marks on the surface of the light-reflecting and light-transmitting composite material is an integral body, so that the irradiation range of the main light source 2 includes the whole surface of the non-light-transmitting material, and the irradiation range of the special light source modulated by the grating device 4 includes the whole surface of the light-transmitting material.
According to an embodiment of the application, the surface of the auxiliary light source 3, the surface of the barrier device 4, the surface of the object 5 to be measured and the surface of the lens of the image acquisition device 1 of the imaging system for laser coding etching marks on the surface of the light-reflecting and light-transmitting composite material are parallel and coaxial.
According to one embodiment of the application, the specific use flow of the imaging system for laser coding etching marks on the surface of the light-reflecting and light-transmitting composite material is as follows: firstly, image acquisition equipment is installed according to the predicted working distance and the space position corresponding to the object to be measured, and then the position of a main light source is installed according to the irradiation angle (forming an included angle of 45 degrees with the surface of the object to be measured) of the main light source and the included irradiation range of the area to be measured. The fence device is arranged close to the rear surface of the object to be measured at a short distance, the fence plane is required to be parallel to the front surface of the object to be measured, the middle position of the fence device and the light transmission area of the object to be measured are positioned at the same spatial height, and the light transmission area is completely covered by the fence device after one spatial translation. And finally, mounting a back auxiliary light source, wherein the surface of the light source needs to be parallel to the surface of the fence, the spatial position and the fence keep the same height, and the light-transmitting area of the object to be detected needs to be covered by the back auxiliary light source after the object to be detected is subjected to spatial translation once.
In conclusion, the system adopts a double-light-source imaging mode, a main light source is used for lighting the front side to illuminate the surface of the reflective material, an auxiliary light source is used for lighting the back side, and an auxiliary fence device is added between the auxiliary back light source and the object to be measured, so that the back light source is converted into a modulated light source to better illuminate the surface of the light-transmitting material, and meanwhile, the fence device also improves the contrast for identifying the etching of the light-transmitting part, so that the surface imaging is clearer; the system utilizes the front side irradiation to obtain the reflection information of the surface of the reflective material, utilizes the modulated special light source on the back side to irradiate the information-carrying area on the surface of the transparent material, thereby obtaining the information of the surface of the transparent material, and then utilizes the image receiving device to receive the information, and finally obtains the whole image of the surface of the reflective material and the transparent material.
According to one embodiment of the application, the imaging method of the laser coding etching mark on the surface of the light-reflecting and light-transmitting composite material comprises the following steps:
s1: sequentially arranging an auxiliary light source 3, a barrier device 4, an object to be detected 5 and an image acquisition device 1 according to the position sequence, and arranging a main light source 2 at the side of the image acquisition device 1;
s2: placing a resolution plate on the surface of the object to be measured 5;
s3: adjusting the image acquisition device 1 to make imaging clear;
s4: irradiating the main light source 2 onto the object to be measured 5;
s5: the diffuse reflection light of the etching in the light reflection area of the object to be measured 5 enters the image acquisition equipment 1 and is displayed in the image acquisition equipment 1;
s6: the light irradiated on the light-transmitting portion of the etching mark passes through the transmissive object 5, and the light entering the lens by diffused reflection is small, and the portion of the etching mark cannot be clearly displayed. (ii) a
S7: after passing through the fence device 3, light emitted by the auxiliary light source 3 irradiates the etch of the light-transmitting area of the object to be detected, the light is modulated into a special light source, the modulated light has the characteristic of larger divergence angle, meanwhile, the fence also improves the background contrast of the light-transmitting area, so that the etch of the light-transmitting area is displayed more clearly, and the image acquisition equipment 1 receives and displays diffuse reflection light of the image acquisition equipment.
The imaging method of the laser coding etching mark on the surface of the light-reflecting and light-transmitting composite material comprises the steps of irradiating the laser coding etching mark on the surface of a light-reflecting area of an object to be detected by a front main light source, irradiating the laser coding etching mark on the surface of a light-transmitting area by a back modulated light source, and receiving returned light information by an image receiving device, so that clear imaging of the laser coding etching mark on the surface of the composite material is obtained.
According to one embodiment of the application, the imaging system for laser coding etching marks on the surface of the light-reflecting and light-transmitting composite material comprises an image acquisition device, a main light source 2, an auxiliary light source 3 and a fence device 4 for modulating the light source. For imaging of laser coding etching marks on the surface of a light-reflecting and light-transmitting composite material, the difficulties of unclear imaging on the surface of the light-transmitting material, incongruity in imaging on the surface of the light-transmitting and light-reflecting material and the like exist. The core idea of the invention is to image the etching trace on the surface of the reflective material by using diffuse reflection light on the front surface, image the etching trace on the surface of the transparent material by using diffuse reflection light on the back surface, and image the laser coding etching trace by improving the background contrast of the transparent area. The surface of the object to be measured is irradiated by the front main light source, the light-transmitting area is irradiated by the back modulated light source, and finally, clear imaging of the surface of the composite material is obtained by the image receiving device. The invention can clear the laser coding information on the surface of the imaging composite material and has the advantages of simple system and high integration level.
The above-mentioned embodiments only show some embodiments of the present invention, and the description thereof is more specific and detailed, but should not be construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the claims.
Claims (9)
1. The imaging system for the laser coding etching mark on the surface of the light-reflecting and light-transmitting composite material is characterized by comprising the following modules:
an image acquisition device for taking an image of an object;
the main light source is used for integrally illuminating the object to be detected so as to highlight the characteristic information of the object to be detected;
the auxiliary light source is used for complementing illumination on the object to be detected so that the characteristic information of the object to be detected is richer;
and the barrier device is used for modulating the auxiliary light source.
2. The imaging system for laser coding etching on the surface of the light-reflecting and light-transmitting composite material according to claim 1, wherein: the image acquisition equipment, the main light source, the auxiliary light source and the fence device are all arranged above the base device, and the base device is used for adjusting the positions of the image acquisition equipment, the main light source, the auxiliary light source and the fence device.
3. The imaging system for laser coding etching on the surface of the light-reflecting and light-transmitting composite material according to claim 1, wherein: the base device at the bottom of the image acquisition device is used for adjusting the image acquisition device in the transverse direction, the longitudinal direction and the front-back direction.
4. The imaging system for laser coding etching on the surface of the light-reflecting and light-transmitting composite material according to claim 1, wherein: the primary light source is located to the side of the image acquisition device.
5. The imaging system for laser coding etching on the surface of the light-reflecting and light-transmitting composite material according to claim 1, wherein: the barrier device is located the auxiliary light source with wait to examine between the thing, it locates to examine between the barrier device with the image acquisition equipment.
6. The imaging system for laser coding etching on the surface of the light-reflecting and light-transmitting composite material according to claim 1, wherein: the light emitting surface of the auxiliary light source is parallel to the surface to be detected of the object to be detected, and the light transmission area of the object to be detected is located in the middle of the lighting of the light emitting surface of the auxiliary light source.
7. The imaging system for laser coding etching on the surface of the light-reflecting and light-transmitting composite material according to claim 1, wherein: the light-transmitting area of the surface to be detected of the object to be detected is flush with the center of the fence device.
8. The imaging system for laser coding etching on the surface of the light-reflecting and light-transmitting composite material according to claim 1, wherein: the device also comprises a resolution plate which is arranged on the surface of the object to be measured.
9. An imaging method for laser coding etching marks on the surface of a light-reflecting and light-transmitting composite material is characterized by comprising the following steps:
s1: sequentially arranging an auxiliary light source, a fence device, an object to be detected and image acquisition equipment according to the position sequence, and arranging a main light source at the side of the image acquisition equipment;
s2: placing a resolution plate on the surface of the object to be detected;
s3: adjusting the image acquisition equipment to enable imaging to be clear;
s4: irradiating the main light source onto the object to be measured;
s5: the diffuse reflection light of the etching mark in the light reflection area of the object to be detected enters the image acquisition equipment and is displayed in the image acquisition equipment;
s6: the light irradiated on the etching mark of the light-transmitting part penetrates through the object to be detected;
s7: and after passing through the fence device, light emitted by the auxiliary light source irradiates a light-transmitting area of the object to be detected to be etched, and the image acquisition equipment receives and displays diffuse reflection light of the object to be detected.
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| CN202010409344.3A CN111443040A (en) | 2020-05-14 | 2020-05-14 | Imaging system and method for laser coding etching mark on surface of light-reflecting and light-transmitting composite material |
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| CN202010409344.3A CN111443040A (en) | 2020-05-14 | 2020-05-14 | Imaging system and method for laser coding etching mark on surface of light-reflecting and light-transmitting composite material |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111912848A (en) * | 2020-08-13 | 2020-11-10 | 蚌埠中光电科技有限公司 | Artificial reinspection device for high-generation large-size glass substrate |
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