CN114577756A - Light transmission uniformity detection device and detection method - Google Patents
Light transmission uniformity detection device and detection method Download PDFInfo
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- CN114577756A CN114577756A CN202210496423.1A CN202210496423A CN114577756A CN 114577756 A CN114577756 A CN 114577756A CN 202210496423 A CN202210496423 A CN 202210496423A CN 114577756 A CN114577756 A CN 114577756A
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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
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/59—Transmissivity
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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Abstract
The invention relates to a light transmission uniformity detection device and a detection method, wherein the detection device comprises a camera, a light source and a positioning plate, the camera, the light source and the positioning plate are arranged in the camera, the positioning plate is used for placing an object to be detected, the light source is arranged below the positioning plate, the camera is arranged above the positioning plate, the camera is provided with a box door, a through part passing through the light source is arranged on the positioning plate, the detection device also comprises a detection system connected to the camera, and the detection system is used for controlling the camera and carrying out light transmission uniformity analysis on shot pictures. The device can accomplish the printing opacity degree of consistency to this product by a key and detect, very big promotion the work efficiency that detects, through detecting system's analysis calculation, make detection standard unified, the rate of accuracy is higher, and this detecting system can carry out the sign to the problem detection point, and the staff of being convenient for in time discovers the defective products and improves, and is more intelligent.
Description
Technical Field
The invention relates to the technical field of material measurement, in particular to a device and a method for detecting light transmission uniformity.
Background
Quality defects can appear in the manufacturing and forming process of the silica gel rubber, so that the light-transmitting uniformity is inconsistent after the finished product is assembled, namely, some places are dark and some places are bright under the condition that light on the back surface is lightened, and the sensory experience of a user is influenced. At the present stage, a silica gel rubber manufacturer judges the poor light transmittance by means of human eyes, and has the following problems that firstly, the sense organs of each person are different, so that a unified detection standard does not exist, the detection result is different due to the human eyes, secondly, the detection environment is easily influenced by an external light source, the accuracy is not high, and on the other hand, the detection by means of manual work is low in detection efficiency, so that the integral production efficiency of the product is restricted; on the other hand, some companies adopt a light-transmitting detection device, and in an invention patent with publication number CN111965199A entitled "a light-transmitting flat plate defect detection device capable of automatically focusing", a camera detection device is used to detect light-transmitting flat plate by combining with light source irradiation, and then a computer processes and analyzes the image, so as to determine whether the light-transmitting flat plate has defects. However, the device lacks a stability protection measure for the light source, natural light interference at different times can affect the accuracy of the detection result, and the device lacks an identification for a defect area, which is not beneficial to the analysis and improvement of the defect.
Accordingly, materials with certain light transmission characteristics have poor light transmission rate in the production process.
Disclosure of Invention
The invention aims to provide a device and a method for detecting the light transmission uniformity, which realize the quantitative detection of the light transmission uniformity of a light transmission material by combining a hardware analysis system and a software analysis system, and have high accuracy of a detection result.
In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a printing opacity degree of consistency detection device, include the camera bellows and set up in inside camera, the light source of camera bellows and be used for placing the locating plate that waits to detect the object, the light source set up in the below of locating plate, the camera set up in the top of locating plate, the camera bellows is provided with the chamber door, be equipped with the portion of lining up through the light source on the locating plate, detection device is still including being connected to the detecting system of camera, detecting system is used for control the camera carries out printing opacity degree of consistency analysis to taking the photo.
Preferably, the longitudinal section of the through part is an isosceles trapezoid, the upper side length of the isosceles trapezoid is less than the lower side length, and the angle formed by the waist of the isosceles trapezoid and the height of the isosceles trapezoid is set to be 5-10 degrees.
As the preferred scheme, the detection device further comprises a light source fixing frame used for fixing the light source and a positioning plate fixing frame used for fixing the positioning plate, wherein the light source fixing frame is arranged below the positioning plate fixing frame, and the periphery of the positioning plate fixing frame and the periphery of the light source fixing frame are connected with the light shielding plates.
Preferably, the light source is a surface light source covering the through portion.
Preferably, the distance range from the lens of the camera to the object to be detected is set to be 12-22 cm.
Preferably, the detection apparatus further includes a camera support assembly for fixing the camera, the camera support assembly includes a first guide post and a second guide post which are vertically arranged, and a slider, the first guide post and the second guide post are respectively slidably connected to the slider, and the camera is connected to one end of the second guide post. The first guide post and the second guide post respectively drive the camera to adjust the direction of the Z-axis direction and the Y-axis direction. The camera support assembly further comprises a sliding plate connected to the bottom of the camera bellows, connecting holes are formed in the sliding plate, and two rows of mounting holes matched with the connecting holes are formed in the bottom of the camera bellows along the X-axis direction and used for mounting the sliding plate and adjusting the position of the sliding plate.
The invention also provides a transmission uniformity detection method, which uses the transmission uniformity detection device of any scheme, and the detection method of the detection system comprises the following steps:
step one, modeling the shape of a detection point: modeling the shapes of detection points of an object to be detected by using an Ncc gray level matching model or a shape matching model based on an edge contour to form a shape model;
step two, matching the template image to measure the position of a detection point: searching the template image by using the established shape model, and calculating the position information of each detection point in the template image, wherein the position information comprises row, column and angle coordinate information;
step three, recognizing the position of a detection point of a shot image: during actual operation, the position of each detection point in the shot image is searched and calculated by using the established shape model, and a matching relation and a transformation matrix with the corresponding detection point in the template image are established;
step four, spot detection: using a gray threshold or a dynamic threshold (when the detection precision requirement is high), identifying an area with the transmittance of each detection point different from other areas, alarming spots lower than or higher than the transmittance threshold and higher than the area threshold, and displaying the corresponding detection point area and the alarming spots on a screen;
step five, analyzing the light transmission uniformity of the detection points: carrying out gray level analysis (mean value and standard deviation) on each detection point area, judging whether the light transmission of a single detection point is uniform or not according to the standard deviation, comparing whether the light transmission has larger difference between detection points or not by comparing different detection point mean values, alarming when the light transmission exceeds a set threshold value, and displaying the problem detection point area on a screen.
Compared with the prior art, the invention has the beneficial effects that:
(1) the device is whole through the bellows design, makes the light source stable, fixed through designs such as area source, light screen, only needs to wait to detect the product and put into the locating plate, can accomplish the printing opacity degree of consistency to this product by a key and detect. The detection efficiency is greatly improved, and the detection standard is unified and the accuracy is higher through the analysis and calculation of the detection system.
(2) Carry out the analysis to taking the photo through detecting system, but automatic calculation, demonstration treat the printing opacity degree of consistency of detecting the product to carry out the sign with the problem check point, the staff of being convenient for in time discovers the defective products and improves, easy operation, convenient, it is more intelligent.
Drawings
FIG. 1 is a schematic view of an overall structure of a device for detecting uniformity of transmitted light according to the present invention;
FIG. 2 is a schematic view of another exemplary embodiment of a device for detecting uniformity of transmitted light;
FIG. 3 is a schematic view of the interior of the dark box of the apparatus for detecting uniformity of transmittance of light according to the present invention;
FIG. 4 is a schematic view of a positioning plate according to the present invention;
FIG. 5 is a rear view of the positioning plate of the present invention;
FIG. 6 is a cross-sectional view taken along line A-A of FIG. 5;
the various reference numbers in the figures mean:
1. a dark box; 2. a camera; 3. a surface light source; 4. positioning a plate; 5. a first door; 6. a second door; 8. a support pillar; 9. a light source fixing frame; 10. a positioning plate fixing frame; 11. a through part; 12. a visor; 13. taking a hand position; 14. a positioning column; 15. a vacuum adsorption hole; 71. a sliding plate; 72. a first guide post; 73. fastening a handle; 74. a slider; 75. a second guide post; 76. connecting holes; 77. and (7) installing holes.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.
Referring to fig. 1, fig. 2 and fig. 3, the present embodiment discloses a device for detecting uniformity of light transmission, which is used for detecting uniformity of light transmission of light-transmitting materials such as silicone rubber and acrylic plates. This printing opacity degree of consistency detection device includes camera 1, 1 inside camera 2 that is provided with of camera, the light source, and be used for placing the locating plate 4 that waits to detect the object, camera 2 is external to have detecting system, utilize camera 2 to wait to detect the object through the light source illumination and shoot, and will shoot the photo and transmit to detecting system, carry out the analysis to the photo of shooting through detecting system, automatic calculation, demonstrate the printing opacity degree of consistency that waits to detect the object, and carry out the sign with bad area, display screen and user through detecting system carry out the information interaction. The camera 2 further comprises a camera body, preferably a black and white industrial camera, in this embodiment a BASLER brand ASLER-500W black and white industrial camera, and a lens, in this embodiment a MORTEX brand ML-M0822 UR. The shell of the camera bellows 1 is made of sheet metal materials, and the inner wall of the camera bellows is coated with matte black, so that the uniqueness of a light source is ensured, and light interference is avoided. Further, the camera bellows 1 is provided with an openable door so as to facilitate taking and placing of the object to be detected and connection of the circuit wiring harness. In a preferred embodiment, the chamber doors include a first chamber door 5 and a second chamber door 6, the camera bellows 1 is provided with a first chamber door 5 and a second chamber door 6 on two opposite sides thereof, the first chamber door 5 is disposed at a middle lower portion of the camera bellows 1, an electric circuit inside the camera bellows 1 is connected and arranged by opening the first chamber door 5, the first chamber door 5 is made of the same material as a housing of the camera bellows 1 and is hinged to the housing of the camera bellows 1 by a hinge, and a door handle is disposed on an outer wall of the first chamber door 5, so that a user can open and close the first chamber door 5 by holding the door handle. The second chamber door 6 sets up in the opposite side of first chamber door 5, utilizes second chamber door 6 to adjust, change and wait to detect camera 2 in camera bellows 1 and wait to detect operations such as getting of object, location, and second chamber door 6 sets up to the shading rolling slats door, adopts black POM material, and the outer wall also is provided with the door handle, can upwards push-and-pull carry out opening of second chamber door 6.
Referring to fig. 3, in the camera bellows 1, a camera support assembly is connected to the bottom of the camera bellows 1 for supporting and fixing the camera 2, in this embodiment, the camera 2 is disposed above the object to be detected. The side of the camera bracket assembly is sequentially connected with a light source fixing frame 9 used for fixing a light source and a positioning plate fixing frame 10 used for fixing the positioning plate 4 through four supporting columns 8, the light source fixing frame 9 is arranged below the positioning plate fixing frame 10, and the positioning plate fixing frame 10 is arranged below the camera 2. The light source irradiates the object to be detected from below the object, and the camera 2 photographs the irradiated object from above the object to be detected. In this embodiment, the positioning plate fixing frame 10 is provided with a hollow-out shape through which the light source can pass. The shape of the positioning plate 4 needs to be matched with the shape of the object to be detected for specific setting, and for the specific part to be detected of the object to be detected, the corresponding position of the positioning plate 4 is provided with a through part 11 so that the light source can pass through. The light source is preferably a surface light source 3, and the surface light source 3 should cover the whole surface of the through part 11 of the positioning plate 4 to ensure the brightness of the light source projected onto the object to be detected to be consistent.
In order to ensure the shooting definition and the accuracy of the detection result, the distance from the lens to the object to be detected is set to be 12-22cm, and the distance can be properly adjusted according to the shape of the object to be detected.
Referring again to fig. 3, in one embodiment, the camera bracket assembly for fixing the camera 2 can adjust the orientation of the camera to ensure the best position matching with the object to be detected, specifically, the camera bracket assembly includes a sliding plate 71 detachably connected to the bottom of the camera chamber 1, a first guiding post 72 is fixedly arranged on the upper surface of the sliding plate 71, and a sliding block 74 slidably connected to the first guiding post 72, the sliding block 74 is provided with two through holes arranged perpendicular to each other, the first guiding post 72 is slidably connected to one of the through holes of the sliding block 74, through which the sliding block 74 performs reciprocating motion along the Z-axis direction of the first guiding post 72, a fastening handle 73 is arranged at a position where the sliding block is connected, and the relative positions of the sliding block 74 and the first guiding post 72 can be fastened or loosened by rotating the fastening handle 73; further, a second guide post 75 is slidably connected to the other through hole of the slider 74, and it is understood that the second guide post 75 is provided perpendicularly to the first guide post 72, the second guide post 75 is capable of reciprocating in the Y-axis direction with respect to the slider 74, a fastening knob 73 is similarly provided at the position of the slide connection lock, and the relative position of the slider 74 and the second guide post 75 can be fastened or unfastened by rotating the fastening knob 73. The camera 2 is connected to one end of the second guide post 75, and then the camera 2 can be driven by the camera support assembly to perform reciprocating motion in the Z-axis direction and the Y-axis direction, so that the orientation of the camera 2 can be adjusted. Furthermore, the sliding plate 71 is provided with strip-shaped connecting holes 76 at four corners thereof, and two rows of mounting holes 77 matched with the connecting holes 76 of the sliding plate 71 are respectively arranged at the bottom of the camera bellows 1 along the X-axis direction for mounting the sliding plate 71 and adjusting the position thereof, so that the sliding plate 71 can be adjusted in position along the X-axis direction at the bottom of the camera bellows 1, thereby adjusting the orientation of the camera 2 along the X-axis direction.
In one embodiment, the light source fixing frame 9 and the positioning plate fixing frame 10 have the same length and width specifications, and a light shielding plate 12 is arranged around the positioning plate fixing frame 10 and the light source fixing frame 9, and the light shielding plate 12 extends downwards from the positioning plate fixing frame 10 and covers at least the periphery of the light source fixing frame and is generally connected to the bottom of the dark box 1. The light shielding plate 12 can further ensure the uniqueness of the light source, eliminate the interference of external light and ensure the accuracy of detection results.
Referring to fig. 4-6, in one embodiment, the through portion 11 of the positioning board 4 has a longitudinal section generally configured as an isosceles trapezoid, which is narrow at the top and wide at the bottom, i.e. the cross-sectional area of the through portion 11 increases from the top surface to the bottom surface of the positioning board 4, and the arrangement can make full use of the reflection of the light source, so that the light source can be fully illuminated under the object to be detected. The angle formed by the waist of the isosceles trapezoid and the height of the isosceles trapezoid is set to be 5-10 degrees. Further, the positioning plate fixing frame 10 is provided with a sunken step, the center of the sunken step is set to be a hollow shape which can enable the light source to penetrate through, the positioning plate 4 is embedded into the sunken step, and the two corresponding side positions of the positioning plate 4 are respectively set to be structures recessed inwards and are the handle positions 13 in order to facilitate taking and placing of the positioning plate 4. The positioning plate 4 for placing the object to be detected generally adopts a mode including but not limited to setting a positioning column, utilizing a vacuum absorption hole structure or setting a buckle or the like to position and fix the object to be detected. For convenience of understanding, referring to fig. 4-6, the remote controller upper cover of the present embodiment is described as an example of an object to be detected being made of a silica gel material, and the positioning plate 4 is respectively provided with a through portion 11 corresponding to 22 keys of the remote controller upper cover to be subjected to light transmission detection, a positioning column 14 for positioning the remote controller upper cover, and a vacuum suction hole 15 for sucking the remote controller upper cover.
The invention also provides a detection method of the light transmission uniformity, the detection method of the detection system of the detection device in each embodiment is as follows:
(1) modeling the shape of the detection point: modeling the shapes of all detection points of the object to be detected by using an Ncc gray level matching model or a shape matching model based on an edge profile to form a shape model;
(2) matching the template image to measure the position of a detection point: searching the template image by using the established shape model, and calculating the position information of each detection point in the template image, wherein the position information comprises row, column and angle coordinate information;
(3) recognizing the positions of detection points of shot images: during actual operation, the position of each detection point in the shot image is searched and calculated by using the established shape model, and a matching relation and a transformation matrix with the corresponding detection point in the template image are established;
(4) and (3) spot detection: using a gray threshold or a dynamic threshold (when the detection precision requirement is high), identifying an area with the transmittance of each detection point different from other areas, alarming spots lower than or higher than the transmittance threshold and higher than the area threshold, and displaying the corresponding detection point area and the alarming spots on a screen;
(5) and (3) analyzing the light transmission uniformity of the detection points: carrying out gray level analysis (mean value and standard deviation) on each detection point area, judging whether the light transmission of a single detection point is uniform or not according to the standard deviation, comparing whether the light transmission has larger difference between detection points or not by comparing different detection point mean values, alarming when the light transmission exceeds a set threshold value, and displaying the problem detection point area on a screen.
The light transmission uniformity detection device provided by the invention has the advantages that the object to be detected is flatly placed in the positioning plate above the surface light source in the dark box, the lower surface of the object to be detected is ensured to be in the same plane and not to warp and deform, the surface light source is lightened, the camera shoots the object to be detected and then transmits the object to be detected to the detection system, the light transmission uniformity of each detection point is analyzed through the detection system, except the point to be detected, the device is shielded from light in other regions, the detection region is ensured not to be influenced by other light sources to shoot and analyze, the brightness uniformity can be detected by the device is more than 95%, and the brightness can be adjusted and measured. The detection of the light transmission uniformity can be finished by one key only by manually putting an article to be detected into the positioning plate, the efficiency is improved, the accuracy is ensured, and the detection device is very intelligent and has good application prospect.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and the preferred embodiments of the present invention are described in the above embodiments and the description, and are not intended to limit the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. The utility model provides a printing opacity degree of consistency detection device, its characterized in that, including camera bellows (1) and set up in camera (2), the light source of camera bellows (1) inside and be used for placing locating plate (4) of waiting to detect the object, the light source set up in the below of locating plate (4), camera (2) set up in the top of locating plate (4), camera bellows (1) is provided with the chamber door, be equipped with through portion (11) through the light source on locating plate (4), detection device is still including being connected to the detecting system of camera (2), detecting system is used for control camera (2) and carry out printing opacity degree of consistency analysis to the picture of shooing.
2. The uniformity detecting apparatus for transmittance according to claim 1, wherein the longitudinal section of the through portion (11) is an isosceles trapezoid, the upper side length < the lower side length of the isosceles trapezoid.
3. The apparatus of claim 2, wherein the angle between the waist of the isosceles trapezoid and the height of the isosceles trapezoid is set to be 5 ° to 10 °.
4. The light transmission uniformity detection device according to claim 1, further comprising a light source fixing frame (9) for fixing a light source and a positioning plate fixing frame (10) for fixing the positioning plate (4), wherein the light source fixing frame (9) is disposed below the positioning plate fixing frame (10), and the periphery of the positioning plate fixing frame (10) and the light source fixing frame (9) is connected with light shielding plates (12).
5. The light transmission uniformity detecting device according to claim 1, wherein the light source is a surface light source (3), and the surface light source (3) covers the through portion (11).
6. The light transmission uniformity detection device according to claim 1, wherein the distance from the lens of the camera (2) to the object to be detected is set to be 12-22 cm.
7. The light transmittance uniformity detection apparatus according to claim 1, further comprising a camera bracket assembly for fixing the camera (2), wherein the camera bracket assembly comprises a first guide post (72) and a second guide post (75) which are vertically arranged, and a slider (74), the first guide post (72) and the second guide post (75) are respectively slidably connected to the slider (74), and the camera (2) is connected to one end of the second guide post (75).
8. The light transmission uniformity detection device according to claim 7, wherein the camera bracket assembly further comprises a sliding plate (71) connected to the bottom of the camera bellows (1), the sliding plate (71) is provided with a connecting hole (76), and the bottom of the camera bellows (1) is provided with two rows of mounting holes (77) matched with the connecting hole (76) along the X-axis direction for mounting the sliding plate (71) and adjusting the position thereof.
9. A transmission uniformity detecting method, using the transmission uniformity detecting apparatus of any one of claims 1-8, the detecting method of the detecting system is:
step one, modeling the shape of a detection point: modeling the shapes of all detection points of an object to be detected to form a shape model;
step two, matching the template image to measure the position of a detection point: searching the template image by using the established shape model, and calculating the position information of each detection point in the template image;
step three, recognizing the position of a detection point of a shot image: searching and calculating the position of each detection point in the shot image by using the shape model, and establishing a matching relation and a transformation matrix with the corresponding detection point in the template image;
step four, spot detection: identifying the transmittance of each detection point by using a gray threshold or a dynamic threshold, alarming the spots which are lower than or higher than the transmittance threshold and higher than the area threshold, and identifying the corresponding detection point areas and the alarming spots;
step five, analyzing the light transmission uniformity of the detection points: and carrying out gray level analysis on each detection point area, judging whether the light transmission of a single detection point is uniform or not according to the standard deviation, comparing the average values of different detection points, comparing the difference of the light transmission between the detection points, alarming when the set threshold value is exceeded, and displaying the problem detection point area on a screen.
10. The method of claim 9, wherein the position information comprises row, column, and angle coordinate information.
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