CN111999309A - Positioning column defect industrial vision detection equipment and detection method - Google Patents
Positioning column defect industrial vision detection equipment and detection method Download PDFInfo
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- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
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Abstract
The invention relates to positioning column defect industrial vision detection equipment and a detection method. The detection equipment comprises a shooting module, an image processing and analyzing module and a first adjusting module, wherein the shooting module is used for shooting the positioning column along a shooting direction which forms a preset inclination angle with the extending direction of the positioning column of the product to be detected so as to obtain a detection image, and the detection image comprises a side image of the positioning column; the image processing and analyzing module is used for acquiring the side projection area of the positioning column and/or the side projection height of the positioning column according to the detection image and analyzing whether the positioning column has defects or not according to the side projection area of the positioning column and/or the side projection height of the positioning column, and the first adjusting module is used for adjusting the preset inclination angle of the shooting module.
Description
[ technical field ] A method for producing a semiconductor device
The invention relates to the field of industrial visual detection, in particular to an industrial visual detection method and detection equipment for defects of positioning columns.
[ background of the invention ]
Generally, an industrial vision inspection apparatus has an industrial camera for inspecting a dimensional specification, presence or absence of a defect, or the like of a product to be inspected based on a photographed inspection image.
With the development of industrial technology, industrial manufacturing processes are more and more precise. Many accessories (such as a mainboard, a flexible wire circuit board and a key) in electronic equipment (such as a mobile phone, a flat panel and the like) need to be fixed, and the fixing mode is as follows: positioning posts or locking screws. The positioning column has a positioning function, and is fixed in a screw locking mode, so that the precision of the fixing mode is guaranteed, and the fixing mode is firmer. If the reference column breaks off, when fixed accessory, lead to the location inaccurate, accessory aversion contact is bad, and more serious then can report useless product. Therefore, a method is needed to detect whether the positioning post of the housing (e.g., middle frame) of the electronic device is defective (e.g., broken) during the manufacturing process. The existing detection is mainly manual detection, and production operators can check the positioning columns one by the human eyes of each product. Manual detection needs a large amount of manpower, the labor cost is high, human eyes are easy to fatigue, and the risk of missing detection exists.
[ summary of the invention ]
In order to solve the problem that the existing positioning column has high labor cost or high missing detection risk due to manual detection, it is necessary to provide positioning column defect industrial visual detection equipment and a detection method.
An industrial vision inspection device for defects of positioning columns, comprising:
the device comprises a shooting module, a positioning module and a control module, wherein the shooting module is used for shooting a positioning column of a product to be detected along a shooting direction which forms a preset inclination angle with the extending direction of the positioning column so as to obtain a detection image, and the detection image comprises a side image of the positioning column; and
the image processing and analyzing module is used for acquiring the side projection area and/or the side projection height of the positioning column according to the detection image and analyzing whether the positioning column has defects or not according to the side projection area and/or the side projection height of the positioning column;
the first adjusting module is used for adjusting a preset inclination angle of the shooting module.
An industrial visual inspection method for defects of positioning columns comprises the following steps:
shooting the positioning column along a shooting direction which forms a preset inclination angle with the extending direction of the positioning column of the product to be detected to obtain a detection image, wherein the detection image comprises a side image of the positioning column;
acquiring the side projection area of the positioning column and/or the side projection height of the positioning column according to the detection image; and
and analyzing whether the positioning column has defects or not according to the side projection area and/or the side projection height of the positioning column.
Compared with the prior art, in the positioning column defect industrial vision detection equipment and the detection method provided by the embodiment of the invention, the positioning column is shot along the shooting direction which has a preset inclination angle with the extending direction of the positioning column of the product to be detected to obtain a detection image, and the detection image comprises a side image of the positioning column; acquiring the side projection area of the positioning column and/or the side projection height of the positioning column according to the detection image; and analyzing whether the positioning column has defects or not according to the side projection area and/or the side projection height of the positioning column, so that manual detection is not needed, the labor cost can be reduced, the detection efficiency is improved, and the missed detection risk is reduced.
[ description of the drawings ]
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without inventive efforts, wherein:
fig. 1 is a schematic block diagram of a part of an industrial vision inspection apparatus for detecting defects of positioning pillars according to a preferred embodiment of the present invention.
Fig. 2 is a schematic partial perspective view of an industrial vision inspection apparatus for detecting defects of positioning pillars according to a preferred embodiment of the present invention.
Fig. 3 is a schematic perspective view of another angle of the industrial vision inspection equipment for detecting defects of the positioning column according to an embodiment of the present invention.
Fig. 4 is a schematic structural diagram of a shooting module and a first adjusting module of an industrial vision inspection apparatus for detecting defects of a positioning column according to an embodiment of the present invention.
Fig. 5 is a flowchart of an industrial visual inspection method for detecting defects of positioning pillars according to an embodiment of the present invention.
Fig. 6 and 7 are schematic diagrams of light path reflection when two different positioning pillars are detected by the industrial vision inspection equipment for detecting defects of the positioning pillars according to an embodiment of the present invention.
Fig. 8 and 9 are schematic diagrams of detection images of the industrial vision inspection equipment for detecting defects of the positioning post according to an embodiment of the present invention when two different positioning posts are detected.
Fig. 10 is a schematic diagram illustrating the principle of determining the defect of the positioning post according to the side projection area and/or the side projection height of the positioning post according to the industrial vision inspection equipment and the inspection method for the defect of the positioning post according to an embodiment of the invention.
[ detailed description ] embodiments
Referring to fig. 1 and fig. 2, fig. 1 is a schematic block diagram of a part of a positioning post defect industrial vision inspection apparatus 10 according to an embodiment of the present invention, and fig. 2 is a schematic perspective view of a part of the positioning post defect industrial vision inspection apparatus 10 according to a preferred embodiment of the present invention. The detection device 10 is used for detecting the product 90 to be detected with the positioning column 91 to know whether the positioning column 91 of the product 90 to be detected has a defect, for example, whether the positioning column 91 of the product 90 to be detected is broken and shortened or disappears. The product 90 to be detected may be a casing of an electronic device (e.g., a middle frame of a mobile phone or a tablet), and has one or more positioning columns 91, where the positioning columns 91 may be used to cooperate with positioning grooves and the like of other elements of the electronic device (e.g., a rear cover of a mobile phone) to realize assembly and fixation of the product to be detected and the other elements. It is understood that the material of the product to be detected may comprise an aluminium alloy, a plastic composite material. The mobile phone or tablet middle frame can be a main component of a mobile phone mechanism, and refers to a connection area between a front panel and a rear cover and is used for fixing important accessories such as a mobile phone or tablet main board, a battery, a mobile phone camera, an SIM card and the like, the front side of the mobile phone or tablet middle frame is used for fixing a mobile phone display screen, and the back side of the mobile phone or tablet middle frame is used for fixing the rear cover.
In this embodiment, the detecting apparatus 10 may include a shooting module 20 and an image processing and analyzing module 30. The camera module 20 may be electrically or communicatively connected to the image processing and analyzing module 30. The shooting module 20 is configured to shoot the positioning column 91 along a shooting direction (as shown in D1 in fig. 2) at a preset inclination angle with respect to an extending direction (as shown in D2 in fig. 2) of the positioning column 91 of the product 90 to be detected to obtain a detection image, where the detection image includes a side image of the positioning column 91. The camera module 20 may provide the inspection image to the image processing and analyzing module 30. The image processing and analyzing module 30 is configured to obtain a side projection area of the positioning post 91 and/or a side projection height of the positioning post 91 according to the detection image, and analyze whether the positioning post 91 has a defect according to the side projection area of the positioning post 91 and/or the side projection height of the positioning post 91.
It is understood that the shooting direction may be an extending direction of an optical axis of the shooting module 20, such as an optical axis direction of a lens of the shooting module 20. The extending direction of the positioning column 91 may be the direction of the central axis of the positioning column 91, and if the positioning column 91 is an elliptic cylinder, a rectangular cylinder, or the like, the extending direction of the positioning column 91 may be the direction of the central axis of the elliptic cylinder, the cylinder, or the rectangular cylinder. The preset inclination angle may be in the range of 0 to 90 degrees. Specifically, in this embodiment, the preset inclination angle may be in a range from 15 degrees to 35 degrees, so as to achieve a more accurate defect determination result of the positioning pillar 91.
As shown in fig. 2 and 3, the inspection apparatus 10 may further include a mounting table 40, a first adjusting module 50, a light source 60, and a second adjusting module 70.
The shooting module 20 may be installed on the installation table 40, and specifically, may be installed on the installation table 40 through the first adjusting module 50, which is used to adjust the preset inclination angle. The light source 60 is configured to emit light to the product 90 to be detected, and the light emitted by the light source 60 can enter the shooting module 20 after being reflected by the positioning column 91, the light source 60 can be installed on the installation table 40, specifically, can be installed on the installation table 40 through the second adjusting module 70, and the second adjusting module 70 is configured to adjust the direction of the light emitted by the light source 60, so that the light emitted by the light source 60 can enter the shooting module 20 after being reflected by the positioning column 91.
The shooting module 20 may include a camera 21 and an industrial lens 22 mounted on the camera 21, and the camera 21 may be an area-array camera or a line-scan camera. In this embodiment, the camera 21 is an area-array camera, and it can be understood that the area-array camera is a camera capable of acquiring an image at a time and collecting the image in time, and it realizes the pixel matrix shooting. In the image shot by the area-array camera, the details of the image are determined by the resolution instead of the number of pixels, wherein the resolution is determined by the focal length of the selected lens, and the same area-array camera has different resolutions by selecting lenses with different focal lengths. The area array camera is adopted to help to acquire clear detection images.
Referring to fig. 3, the mounting table 40 includes a substrate 41 and a support 42 connected to the substrate 41. The number of the supporters 42 may be two, and the two supporters 42 may respectively support both ends of the substrate 41. The substrate 41 may have an opening 411. The first adjusting module 50 is mounted on the substrate 41, so that the photographing module 20 is located at one side of the substrate 41, the second adjusting module 70 is mounted on the substrate 41, so that the light source 60 is located at one side of the substrate 41 far from the photographing module 20, the product 90 to be detected can be disposed at one side of the light source 60 far from the photographing module 20, and the photographing module 20 can receive the light reflected by the positioning column 91 through the opening 411.
The first adjusting module 50 is used for adjusting the preset inclination angle, and specifically, the first adjusting module 50 can drive the camera module 20 to move to adjust the preset inclination angle. It can be understood that the preset clear angle is adjustable by the first adjusting module 50, so that a user can select a proper preset clear angle according to actual needs, and the preset clear angle is suitable for detecting the positioning columns 91 of different products 90 to be detected.
As shown in fig. 4, the first adjusting module 50 includes an angle adjusting member 51, a fixing plate 52 connected to the angle adjusting member 51, and a mounting plate 53. The mounting plate 53 may be disposed on the base plate 41 adjacent to the opening, the angle adjusting member 51 is connected to the mounting plate 53, and the fixing plate 52 is connected between the angle adjusting member 51 and the photographing module 20.
Specifically, the photographing module 20 may be mounted on the fixing plate 52. The camera module 20 can also be slidably connected to the fixing plate 52, so that the camera module 20 can slide along the shooting direction to change the shooting height (or the distance between the camera module and the product 90 to be detected) to obtain a clear image. The angle adjusting member 51 includes two first calibration plates 511 oppositely disposed and an adjusting plate 512 disposed between the two first calibration plates 511. The two first scale plates 511 may be connected to the mounting plate 53, and the adjusting plate 512 may be connected to the photographing module 20 through the fixing plate 52.
The two first scale plates 511 each have a first scale groove 513, and both ends of the adjusting plate 512 are mounted in the first scale grooves 513 and can slide along the first scale grooves 513, so that the preset inclination angle is changed; the first scale groove 513 is an arc scale groove; the edge of the first scale plate 511 adjacent to the first scale groove 513 is further provided with a scale mark 514 and a scale reference mark 515 for indicating the preset inclination angle, and the scale mark 514 of the first scale plate is adjacent to the edge of the first scale groove 513 and can be perpendicular to the extending direction of the first scale groove 513. One of the graduation marks 514 extends in the same direction as the adjusting plate 512, and can be used to indicate the preset inclination angle in combination with the graduation reference mark 515. Further, the fixing plate 52 includes a fixing plate 522 having a sliding slot 521, and at least a portion of the photographing module 20 is slidably connected to the sliding slot 522; the fixing plate 522 may be a rectangular plate, and the extending direction of the sliding slot 521 is the same as the extending direction of the fixing plate 522; the fixing plate 522 is vertically connected to one end of the adjusting plate 512 adjacent to the product 90 to be detected.
Referring to fig. 2, the light source 60 may include a first surface 61 located on a side away from the photographing module 20, a second surface 62 opposite to the first surface 61, and a light-transmitting area 63 penetrating through the first surface 61 and the second surface 62, the first surface 61 is used for emitting light toward the product 90 to be detected, and the light reflected by the positioning column 91 can enter the photographing module 20 through the light-transmitting area 63. In this embodiment, the light source 60 may include a blue light emitting source for emitting blue light toward the product 90 to be detected, and the light reflected by the positioning column 91 can enter the shooting module 20 through the light-transmitting area 63.
The second adjusting module 70 includes two second scale plates 71 disposed oppositely, and two ends of the light source 60 can be installed between the two second scale plates 71; the two second scale plates 71 each have a second scale groove 711, and both ends of the light source 60 can be mounted in the second scale grooves 711 and can slide along the second scale grooves 711, so that the direction of the light emitted by the light source 60 is changed; the second scale groove 711 is an arc scale groove; the second scale plate 71 may also be provided with scale lines adjacent to the edges of the second scale grooves 711.
The image processing and analyzing module 30 may be, but is not limited to, a computer device, which may include a processor. The image processing and analyzing module 30 may calculate the side projection area of the positioning pillar by obtaining the gray scale value of each pixel point in the detection image, extracting the gray scale value within a preset gray scale range, and according to the gray scale value within the preset gray scale range.
Specifically, in some embodiments, the image processing and analyzing module 30 may convert the detected image into a black-and-white image, and obtain a gray scale value of each pixel point in the black-and-white image as a gray scale value of each pixel point in the detected image. When the highest gray scale value of the detected image is 255, the preset gray scale range is 60 gray scale values to 110 gray scale values. It can be understood that the side projection area of the positioning pillar 91 is equal to the product of the area corresponding to a single pixel and the number of gray scale values in the preset gray scale range, where the area corresponding to a single pixel may default to a unit fixed value (e.g. 1 square millimeter), and does not need to be set to an actual area value, so that the number of pixels in the preset gray scale range in the detection image can be used as the side projection area of the positioning pillar 91. It can be understood that each pixel of the detection image includes a red sub-pixel, a green sub-pixel, and a blue sub-pixel, and in the process of converting the detection image into the black-and-white image, the following conversion formula may be adopted: in this embodiment, the conversion constants may be 0.3, 0.59, and 0.11, that is, the Gray level value after each pixel is converted into a black-and-white image is Gray level value of R0.3 + G0.59 + B0.11, but it is understood that the conversion constants are related to the color photographing attributes of the photographing module 20, and may be different for different photographing modules.
Further, the image processing and analyzing module 30 is further configured to compare the side projection area of the positioning column 91 and/or the side projection height of the positioning column 91 with a preset area value and/or a preset height value, and when the side projection area of the positioning column 91 and/or the side projection height of the positioning column 91 is smaller than or equal to the preset area value and/or the preset height value, the image processing and analyzing module 30 determines that the positioning column 91 is broken.
In an embodiment, the image processing and analyzing module 30 may compare the projected area of the positioning pillar 91 with the predetermined area value, and when the projected area of the positioning pillar 91 is smaller than or equal to the predetermined area value, the image processing and analyzing module 30 determines that the positioning pillar 91 is broken.
In another embodiment, the image processing and analyzing module 30 may compare the projected side height of the positioning post 91 with the preset height value, and when the projected side height of the positioning post 91 is smaller than or equal to the preset height value, the image processing and analyzing module 30 determines that the positioning post 91 is broken.
In another embodiment, the image processing and analyzing module 30 can compare the projected area of the side of the positioning post 91 with the predetermined area value, and the image processing and analyzing module 30 can also compare the projected height of the side of the positioning post 91 with the predetermined height value. When the side projection area of the positioning column 91 is smaller than or equal to the preset area value and the side projection height of the positioning column 91 is smaller than or equal to the preset height value, the image processing and analyzing module 30 determines that the positioning column 91 is broken.
Referring to fig. 5, the steps and principles of the industrial visual inspection equipment 10 and the inspection method for detecting defects of the positioning post are described with reference to the flowchart of the industrial visual inspection method for detecting defects of the positioning post. It is understood that the detection method can be executed by the image processing and analyzing module 30 of the industrial vision inspection equipment 10 for detecting defects of the positioning column. The detection method includes steps S1, S2, and S3.
Step S1, shooting the positioning column along a shooting direction which forms a preset inclination angle with the extending direction of the positioning column of the product to be detected to obtain a detection image, wherein the detection image comprises a side image of the positioning column.
When the detection equipment 10 is used for detecting the defect of the positioning column 91 of the product 90 to be detected, the product 90 to be detected can be firstly placed at a detection position, the product 90 to be detected can be positioned between the two supporting members 42 and on one side of the light source 60 away from the shooting module 20, and the shooting direction of the shooting module 20 is adjusted through the first and second adjusting modules 50 and 70, so that the shooting module 20, the light-transmitting area 63 of the light source 60 and the positioning column 91 of the product 90 to be detected are approximately positioned on a straight line, the preset inclination angle can be between 15 degrees and 35 degrees, and the height of the shooting module 20 can be further adjusted along the shooting direction by driving the shooting module 20 to slide along the sliding chute. It can be understood that the main body board surface of the product 90 to be detected can be located in the horizontal plane, the extending direction of the positioning column 91 can be perpendicular to the main body board surface, i.e., extend toward the vertical direction, the shooting direction of the shooting module 20, i.e., the optical axis direction, can be inclined relative to the extending direction of the positioning column 91 (i.e., the vertical direction), i.e., the shooting direction of the shooting module 20 and the extending direction of the positioning column 91 are the preset inclined angle.
After the product 90 to be detected is placed and the position and angle of the shooting module 20 and the light source 60 are adjusted, the light source 60 can be turned on, and light emitted by the light source 60 irradiates the end face of the top of the positioning column 91 and the surface of the product 90 to be detected around the positioning column 91. On one hand, the end surface of the top of the positioning column 91 and the surface of the product to be detected 90 around the positioning column 91 directly emit the light emitted by the light source 60 and enter the shooting module 20 through the light-transmitting area 63; on the other hand, the light emitted by the light source 60 and received by the surface of the product to be detected 90, which is close to the side of the photographing module 20, of the positioning column 91 can be further reflected to the side surface of the positioning column 91, which is close to the side of the photographing module 20, and the light enters the photographing module 20 through the light-transmitting area 63 after being reflected by the side surface, so that the photographing module 20 can photograph the positioning column 91 along a photographing direction which forms a preset inclination angle with the extending direction of the positioning column 91 of the product to be detected 90 to obtain a detection image, where the detection image at least includes a side image of the positioning column 91. It is understood that the inspection image generally also includes an image of the end surface of the top of the positioning column 91 and the surface of the product to be inspected 90 around the positioning column 91. The camera module 20 may provide the inspection image to the image processing and analyzing module 30.
Step S2, obtaining a side projection area of the positioning post and/or a side projection height of the positioning post according to the detection image.
Specifically, the step S2 and its sub-steps may be performed by the image processing and analyzing module 30, and in some embodiments, the step S2 may further include the sub-steps of:
step S21, obtaining the gray scale value of each pixel point in the detection image,
step S22, extracting gray scale values in a preset gray scale range; and
step S23, calculating a side projection area of the positioning pillar according to the gray scale value within the preset gray scale range.
Further, in some embodiments, step S21 may include the steps of: and converting the detection image into a black-and-white image, and acquiring the gray scale value of each pixel point in the black-and-white image as the gray scale value of each pixel point in the detection image. It is understood that, in some embodiments, the predetermined gray scale range may be 60 gray scale values to 110 gray scale values when the highest gray scale value of the detected image is 255 experimentally determined, that is, the pixel region with the gray scale value of 60-110 in the detected image is the projected area of the side surface of the positioning pillar 91, but in other embodiments, the predetermined gray scale range may be different from the above range, and an appropriate range may be set according to actual situations. Further, it can be understood that the preset gray scale range is set in relation to the light emitted by the light source 60, and when the light emitted by the light source 60 becomes stronger in intensity or the light emitting angle changes so that the light irradiated to the side surface of the positioning column 91 becomes larger, the gray scale value of the preset gray scale range will correspondingly become higher. Further, it can be understood that the setting of the preset gray scale range is also related to the preset inclination angle, when the larger the preset inclination angle is, the more the light rays are irradiated to the side surface of the positioning column 91 and reflected to the shooting module 20, and the gray scale value of the preset gray scale range will correspondingly become higher, such as 80 gray scale value-130 gray scale value. However, in the embodiment, for the detection of the positioning column of a certain product to be detected, the light intensity and the light emitting angle of the light source 60 and the preset inclination angle may be set to be preferred fixed values respectively, and the preset gray scale range is also set to be a preferred numerical range and remains unchanged.
Further, it can be understood that the side projection area of the positioning pillar may be equal to the product of the area corresponding to a single pixel and the number of gray scale values within the preset gray scale range, wherein the area corresponding to a single pixel may default to a unit fixed value (e.g. 1 square millimeter), and does not need to be set as an actual area value, so that the number of pixels located within the preset gray scale range in the detection image can be used as the side projection area of the positioning pillar 91.
Step S3, analyzing whether the positioning post has defects according to the side projection area and/or the side projection height of the positioning post.
Specifically, the step S3 and its sub-steps can also be performed by the image processing and analyzing module 30, and in some embodiments, the step S3 can further include the sub-steps of: and comparing the side projection area and/or the side projection height of the positioning column with a preset area value and/or a preset height value, and when the side projection area and/or the side projection height of the positioning column are smaller than or equal to the preset area value and/or the preset height value, judging that the positioning column is broken and shortened or disappears.
As shown in fig. 6, it can be understood that when the positioning pillars 91 are not defective, such as not broken, not shortened or disappeared, the positioning post 91 has a higher height, the side surface of the positioning post 91 reflects more light to the shooting module 20, the side projection area value of the positioning post 91 obtained by the calculation in the steps S1 and S2 is larger, by comparing the projected area of the side of the positioning post 91 (as shown in fig. 8) with the predetermined area value and/or the predetermined height value, when the projected area of the side of the positioning post 91 matches (e.g. is greater than or equal to) the predetermined area value and/or the predetermined height value, then, it is determined that the positioning post 91 is not broken, shortened or disappeared, and the image processing and analyzing module 30 can output a detection result that the positioning post 91 is not defective.
As shown in fig. 7, when the positioning post 91 has a defect, such as broken, not shortened or disappeared, the positioning post 91 has a higher height, the side surface of the positioning post 91 reflects less light to the shooting module 20, the side projected area value of the positioning post 91 obtained by the calculation of the steps S1 and S2 is small, by comparing the projected area of the side of the positioning post 91 (as shown in fig. 9) with the predetermined area value and/or the predetermined height value, when the projected area of the side of the positioning post 91 matches (e.g. is less than or equal to) the predetermined area value and/or the predetermined height value, then, it is determined that the positioning post 91 is broken, shortened or disappeared, and the image processing and analyzing module 30 can output a detection result that the positioning post 91 has a defect (such as broken, shortened or disappeared).
It can be understood that the above embodiments are mainly described by taking the side projection area of the positioning post 91 according to the inspection image and analyzing whether the positioning post 91 has a defect according to the side projection area of the positioning post 91. However, in other embodiments, the side projection height of the positioning post 91 may be obtained according to the inspection image, and whether the positioning post 91 has a defect may be analyzed according to the side projection height of the positioning post 91, wherein the side projection height of the positioning post 91 may be calculated according to the length of the longest line of pixels on the positioning post 91 in the extending direction on the inspection image (such as the lengths L1, L2 shown in fig. 8 and 9).
In addition, it can be understood that the detection images obtained by shooting the positioning column 91 of the product 90 to be detected of the same style are different under different preset inclination angles and/or different light emitting intensities and light emitting angles of the light sources 60, and therefore, in order to ensure the accuracy of defect detection on the positioning column 91 of the product 90 to be detected of the same style, when the defect detection is performed on the positioning column 91 of the product to be detected of the same style during the operation of the detection equipment 10 and the detection method, the preset inclination angle should be set to be kept unchanged, such as a preferred fixed value; meanwhile, the light emitting intensity and the angle of the light source 60 should be set to be constant, and are also preferably fixed values; the preset gray scale range, the preset area value and the side projection height value stored in the image processing and analyzing module 30 should be set to be kept unchanged respectively, and are preferably fixed values.
Further, the following describes the reason why whether the positioning post is defective or not is determined according to the side projection area and/or the side projection height of the positioning post: as can be seen from fig. 10, the side projection height L of the positioning post 91, the height H obtained by photographing the positioning post 91 from the direction perpendicular to the extending direction of the positioning post 91 (i.e. the actual height H of the positioning post 91), and the predetermined inclination angle θ satisfy the following relation: l ═ H × tan θ; similarly, the projected area P of the side surface of the positioning post 91 and the actual area P 'of the side surface obtained by photographing the positioning post 91 from the direction perpendicular to the extending direction of the positioning post 91 should also correspond to P' × tan θ; since the side projection area P of the positioning post 91 and the actual side area P ' of the positioning post 91 have a linear relationship, and the side projection height of the positioning post 91 and the actual height H also have a linear relationship, the side projection area and/or the side projection height of the positioning post 91 can be obtained by analyzing the detection image, and the side projection area and/or the side projection height of the positioning post 91 and the corresponding preset area value and/or the preset height value can be compared, and the determination of the defect of the positioning post 91 can be performed without converting the side projection area and/or the side projection height of the positioning post 91 obtained according to the detection image into the actual side area P ' and/or the actual height H according to the relational expression P '. tan θ and/or L ═ H tan θ, moreover, the data processing amount of the above determination method can be small.
Of course, in some modified embodiments, the image processing and analyzing module 30 may also store the actual side area P 'and/or the actual height H as a preset actual area value and/or a preset actual height value, and the image processing and analyzing module 30 obtains the side projection area and/or the side projection height of the positioning pillar 91 according to the detected image, converts the side projection area and/or the side projection height of the positioning pillar 91 into the actual side area and/or the actual height of the positioning pillar 91 according to the preset inclination angle θ, the relational expression P'. gtan θ and/or L ═ H tan θ, and compares the actual side area and/or the actual height with the preset actual area value and/or the preset actual height value to determine whether the positioning pillar 91 is defective, so that a person skilled in the art can fully understand how to implement the modification according to the description of the present application The detailed description of the embodiments is omitted here. In summary, in a modified embodiment, the step S3 executed by the image processing and analyzing module 30 may also include the following sub-steps: converting the side projection area of the positioning column and/or the side projection height of the positioning column into an actual side area and an actual height, comparing the actual side area and the actual height with a preset actual area value and/or a preset actual height value, and judging that the positioning column is broken and shortened or disappears when the actual side area and the actual height are less than or equal to the preset actual area value and/or the preset actual height value.
Further, it can be understood that, before the defect detection of the positioning column 91 of the product to be detected 90 is performed by using the detection apparatus 10 and the detection method, the preset area value and/or the side projection height value stored by the image processing and analyzing module 30 should be determined first, and the principle and method how to determine the preset area value and/or the side projection height value stored by the image processing and analyzing module 30 are described below.
The preset area value and/or the side projection height value stored by the image processing and analyzing module 30 may be determined and stored through a pre-test, specifically, the pre-test process is briefly described as follows: providing said detecting device 10 andthe sunk product 90 to be detected and the positioning column 91 thereof (as shown in fig. 6) are arranged at the detection position of the detection equipment 10, and the included angle between the shooting direction of the shooting module 20 and the extending direction of the positioning column 91 is determined to be theta through adjustment0The light source 60 has a luminous intensity of Q0And the light emitting angle of the light source 60 is a0(i.e., the included angle between the light-emitting direction of the light source 60 and the extending direction of the positioning post 91), the image capturing module 20 captures the product 90 to be detected and the positioning post 91 thereof shown in fig. 6 to obtain a test image, and further, the image processing and analyzing module 30 or other image analyzing devices may analyze the test image to obtain a gray scale value of each pixel of the side image of the positioning post 91 in the test image, a side projection area of the positioning post 91 in the test image (e.g., a product of the number of pixels of the side image of the positioning post 91 and a unit area), a side projection height of the positioning post 91 in the test image (e.g., a product of the longest row of pixels of the side image of the positioning post 91 and the unit area), and the like, so that the preset gray scale range may be determined according to the gray scale value of each pixel of the side image of the positioning post 91 in the test image, the preset area value is determined according to the side projection area of the positioning column 91 in the test image (for example, the side projection area of the positioning column 91 in the test image is used as the preset area value), the preset height value is determined according to the side projection height of the positioning column 91 in the test image, and the preset gray scale range, the preset area value and/or the preset height value determined in the above manner are stored in the image processing and analyzing module 30, so that the image processing and analyzing module 30 uses the gray scale range, the preset area value and/or the preset height value when detecting the defect of the positioning column 91 of the product 90 to be detected. Further, it can be understood that, in order to ensure the accuracy of the defect detection of the positioning column 91 of the detection apparatus 10 and the detection method, the product to be detected is performed by using the detection apparatus 10 and the detection method90, the preset inclination angle, the light emitting intensity of the light source 60 and the light emitting angle of the light source 60 set by the inspection apparatus 10 should be the same as those in the test process, that is, the preset inclination angle is set to θ0The light emission intensity of the light source 60 is set to Q0And the light emitting angle of the light source 60 is set to a0。
Compared with the prior art, in the positioning column defect industrial vision detection equipment 10 and the detection method provided by the embodiment of the invention, the positioning column 91 is shot along the shooting direction which has a preset inclination angle with the extending direction of the positioning column of the product to be detected to obtain a detection image, and the detection image comprises a side image of the positioning column 91; acquiring the side projection area of the positioning column 91 and/or the side projection height of the positioning column 91 according to the detection image; and analyzing whether the positioning column has defects or not according to the side projection area of the positioning column 91 and/or the side projection height of the positioning column 91, so that manual detection is not needed, the labor cost can be reduced, the detection efficiency is improved, and the missed detection risk is reduced. Particularly, the defect that the positioning column is broken and shortened or disappears can be detected, the defect that a defective product enters a subsequent assembly process is avoided, the assembly efficiency can be improved, and the product yield can be improved.
Furthermore, when the range of the preset inclination angle is 15 degrees to 35 degrees, better detection result accuracy can be achieved.
Further, the industrial lens 22 may be used in conjunction with an area camera or a line camera to obtain a clear and appropriate detection image.
Further, the first adjusting module 50 is used to adjust the preset inclination angle, specifically, the first adjusting module 50 can drive the camera module 20 to move to adjust the preset inclination angle. It can be understood that the preset clear angle is adjustable by the first adjusting module 50, so that a user can select a proper preset clear angle according to actual needs, and the preset clear angle is suitable for detecting the positioning columns 91 of different products 90 to be detected.
Further, the first adjusting module 50 includes an angle adjusting member 51 and a fixing plate 52 connected to the angle adjusting member 51, and the photographing module 20 is mounted on the fixing plate 52. It can be seen that the structure of the first adjusting module 50 is also relatively simple
Further, the shooting module 20 is also slidably connected to the fixing plate 52, so that the shooting module 20 can slide along the shooting direction to change the shooting height, thereby improving the application range and obtaining the appropriate detection image. Further, the fixing plate 52 includes a fixing plate 522 having a sliding slot 521, and the sliding connection is realized by using a sliding slot structure, so that the overall structure is simple, the implementation is easy, and the reliability is high.
The extending direction of the sliding groove 521 is the same as the extending direction of the fixing plate 522, and the fixing plate 522 is vertically connected with one end of the adjusting plate adjacent to the product to be detected.
Further, the two first calibration plates 511 having the first calibration slots 513 and the calibration lines 514 are oppositely disposed, and the adjusting plate 512 is disposed between the two first calibration plates 511, so that the adjustment of the preset inclination angle can be facilitated.
Further, the first scale groove 513 is an arc-shaped scale groove, so that the adjustment of the preset inclination angle is smoother and more convenient.
Further, the light source 60 is used for shooting and supplementing light, which is beneficial to obtaining a clear detection image.
Further, the photographing module 20 photographs the detection image with the positioning post 91 image through the light-transmitting area 63, so that the detection image is clearer and more accurate, and an accurate detection result is obtained.
Further, the direction of the light emitted by the light source 60 can be adjusted by the second adjusting module 70, and the shooting direction of the shooting module 20 can be adapted, which is helpful for obtaining a clear detection image and an accurate detection result.
Further, the second scale groove 711 is an arc-shaped scale groove, so that the angle of the light emitted by the light source 60 can be adjusted more smoothly and conveniently.
Further, through the mounting table 40, the first adjusting module 50, the shooting module 20, the light source 60, the second adjusting module 70, and the like can be effectively fixed, so that the reliability of the detection apparatus 10 is improved.
Further, the side projection area of the positioning column 91 is calculated by obtaining the gray scale value of each pixel point in the detection image, extracting the gray scale value within a preset gray scale range, and according to the gray scale value within the preset gray scale range. Therefore, the side projection area of the positioning column 91 is obtained by setting a preset gray scale range; and converting the detection image into a black-and-white image, and acquiring the gray scale value of each pixel point in the black-and-white image as the gray scale value of each pixel point in the detection image.
Further, by comparing the side projection area of the positioning column 91 and/or the side projection height of the positioning column 91 with a preset area value and/or a preset height value, when the side projection area of the positioning column 91 and/or the side projection height of the positioning column 91 is less than or equal to the preset area value and/or the preset height value, it is determined that the positioning column is broken and shortened or disappears. The judgment mode is simple, the data processing amount is small, and the method is easy to realize.
The above-described embodiments are merely exemplary, and the division of the modules is only one logical function division, and other division manners may be available in actual implementation. Furthermore, it is obvious that the word "comprising" does not exclude other elements or steps, and the singular does not exclude the plural. Several units or means recited in the system claims may also be implemented by one and the same unit or means in software or hardware. The terms first, second, etc. are used to denote names, but not any particular order.
So that the manner in which the above recited objects, features and advantages of the present invention can be understood in detail, a more particular description of the invention, briefly summarized above, may be had by reference to the embodiments thereof which are illustrated in the appended drawings. It should be noted that the embodiments of the present invention and features of the embodiments may be combined with each other without conflict. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Claims (14)
1. The utility model provides a reference column defect industry visual detection equipment which characterized in that: the detection apparatus includes:
the device comprises a shooting module, a positioning module and a control module, wherein the shooting module is used for shooting a positioning column of a product to be detected along a shooting direction which forms a preset inclination angle with the extending direction of the positioning column so as to obtain a detection image, and the detection image comprises a side image of the positioning column; and
the image processing and analyzing module is used for acquiring the side projection area and/or the side projection height of the positioning column according to the detection image and analyzing whether the positioning column has defects or not according to the side projection area and/or the side projection height of the positioning column;
the first adjusting module is used for adjusting a preset inclination angle of the shooting module.
2. The detection device of claim 1, wherein: the defects of the positioning column comprise the defect that the positioning column is broken to be shortened or disappear, and the range of the preset inclination angle is 15-35 degrees.
3. The detection apparatus of claim 2, wherein: the first adjusting module comprises an angle adjusting piece and a fixing plate connected with the angle adjusting piece, and the shooting module is installed on the fixing plate; the angle adjusting piece comprises two first scale plates and an adjusting plate positioned between the two first scale plates, the two first scale plates are provided with first scale grooves, and two ends of the adjusting plate are mounted in the first scale grooves and can slide along the first scale grooves, so that the preset inclination angle is changed; the fixed plate is provided with a sliding groove, and at least part of the shooting module is in sliding connection with the sliding groove; the extending direction of the sliding groove is the same as that of the fixing plate; the fixing plate is vertically connected with one end, adjacent to the product to be detected, of the adjusting plate.
4. A testing device according to claim 3, wherein: the detection equipment further comprises a light source and a second adjusting module, the light source is used for emitting light to the product to be detected, the light emitted by the light source can enter the shooting module after being reflected by the positioning column, and the second adjusting module is used for adjusting the direction of the light emitted by the light source, so that the light emitted by the light source can enter the shooting module after being reflected by the positioning column.
5. The detection device of claim 4, wherein: the second adjusting module comprises two second scale plates which are oppositely arranged, and two ends of the light source are arranged between the two second scale plates; the two second scale plates are provided with second scale grooves, and two ends of the light source are installed in the second scale grooves and can slide along the second scale grooves, so that the direction of light rays emitted by the light source is changed; the second scale groove is an arc scale groove.
6. The detection device of claim 5, wherein: the detection equipment comprises a mounting table, the mounting table comprises a substrate and a supporting piece connected with the substrate, the substrate is provided with an opening, the first adjusting module is installed on the substrate, so that the shooting module is located on one side of the substrate, the second adjusting module is installed on the substrate, so that the light source is located on one side, away from the shooting module, of the substrate, the product to be detected can be arranged on one side, away from the shooting module, of the light source, and the shooting module can receive light reflected by the positioning column through the opening.
7. The detection device of claim 1, wherein: the image processing and analyzing module is used for obtaining the gray scale value of each pixel point in the detection image, extracting the gray scale value within a preset gray scale range and calculating the side projection area of the positioning column according to the gray scale value within the preset gray scale range.
8. The detection device of claim 1, wherein: the image processing and analyzing module is further used for comparing the side projection area of the positioning column and/or the side projection height of the positioning column with a preset area value and/or a preset height value, and when the side projection area of the positioning column and/or the side projection height of the positioning column are smaller than or equal to the preset area value and/or the preset height value, the image processing and analyzing module judges that the positioning column is broken and shortened or disappears.
9. The detection device of claim 1, wherein: the image processing and analyzing module is used for converting the side projection area of the positioning column and/or the side projection height of the positioning column into an actual side area and an actual height, comparing the actual side area and the actual height with a preset actual area value and/or a preset actual height value, and judging that the positioning column is broken and shortened or disappears when the actual side area and the actual height are smaller than or equal to the preset actual area value and/or the preset actual height value.
10. An industrial visual detection method for defects of positioning columns is characterized by comprising the following steps: the detection method comprises the following steps:
shooting the positioning column along a shooting direction which forms a preset inclination angle with the extending direction of the positioning column of the product to be detected to obtain a detection image, wherein the detection image comprises a side image of the positioning column;
acquiring the side projection area of the positioning column and/or the side projection height of the positioning column according to the detection image; and
and analyzing whether the positioning column has defects or not according to the side projection area and/or the side projection height of the positioning column.
11. The detection method according to claim 10, characterized in that: the step of obtaining the side projection area of the positioning column and/or the side projection height of the positioning column according to the detection image comprises:
acquiring the gray-scale value of each pixel point in the detection image,
extracting gray scale values in a preset gray scale range; and
and calculating the side projection area of the positioning column according to the gray scale value in the preset gray scale range.
12. The detection method according to claim 11, characterized in that: the step of obtaining the gray-scale value of each pixel point in the detection image comprises: converting the detection image into a black-and-white image, and acquiring the gray scale value of each pixel point in the black-and-white image as the gray scale value of each pixel point in the detection image; when the highest gray scale value of the detected image is 255, the preset gray scale range is 60 gray scale values to 110 gray scale values; the side projection area of the positioning column is equal to the product of the area corresponding to a single pixel and the number of gray scale values in the preset gray scale range.
13. The detection method according to claim 12, characterized in that: the step of analyzing whether the positioning column has a defect according to the side projection area and/or the side projection height of the positioning column comprises: and comparing the side projection area and/or the side projection height of the positioning column with a preset area value and/or a preset height value, and when the side projection area and/or the side projection height of the positioning column are smaller than or equal to the preset area value and/or the preset height value, judging that the positioning column is broken and shortened or disappears.
14. The detection method according to claim 13, characterized in that: the step of analyzing whether the positioning column has a defect according to the side projection area and/or the side projection height of the positioning column comprises: and when the actual side surface area and the actual height are less than or equal to the preset actual area value and/or the preset actual height value, the image processing and analyzing module judges that the positioning column is broken and shortened or disappears.
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