Inspection Equipment

Abstract

To provide a technique for accurately detecting irregularities of an article being an inspection object.SOLUTION: An inspection device comprises: an imaging unit which images an article 9; an image processing unit which processes an image captured by the imaging unit; and a determination unit which determines the state of the article. The article is a polyhedron. At least one surface 9S of the article 9 has a first region 91. The first region 91 has a linear first edge E91. The image processing unit detects a first portion 911 located on an end side of the first edge E91 on the first edge E91 in the image, and a second portion 912 located apart in the first direction from the first portion 911 on the first edge E91. The determination unit determines the state of the article on the basis of a distance d1 in the height direction orthogonal to the one surface between the first portion 911 and the second portion 912.SELECTED DRAWING: Figure 7

Description

[Technical field]

[0001] The present invention relates to an inspection device. [Background technology]

[0002] Japanese Patent Application Laid-Open No. 2008-309577 discloses an inspection device for judging the unevenness of a container. The container has a boundary between one surface and another surface adjacent to each other. The inspection device includes a main light irradiation device, a secondary light irradiation device, a camera, an image processing device, and a quality determination device. The main light irradiation device irradiates the one surface near the boundary with linear main light along the boundary of the container. The secondary light irradiation device irradiates the other surface near the boundary with linear secondary light along the boundary. The camera is fixedly installed so as to be able to image the one surface. The image processing device processes the image captured by the camera to generate an image consisting of a reflected light portion and a non-reflected light portion. The quality determination device judges the boundary or the other surface to be defective if the image contains reflected light of the secondary light irradiated near the boundary. [Patent Document 1] JP 2008-309577 A Summary of the Invention [Problem to be solved by the invention]

[0003] However, in the case of the conventional technology, depending on the orientation of the container, reflected secondary light may be included in the image, which may lead to the container being erroneously determined to be defective even if the container is not uneven.

[0004] An object of the present invention is to provide a technique for accurately detecting unevenness of an object to be inspected. [Means for solving the problem]

[0005] In order to solve the above problem, a first aspect is an inspection device for inspecting an object, comprising: an image capturing unit for capturing an image of the object; an image processing unit for detecting a plurality of parts of the object by processing an image captured by the image capturing unit; and a determination unit for determining a state of the object based on the positions of the plurality of parts detected by the image processing unit. The object is a polyhedron. At least one surface of the object has a first region. The first region has a linear first edge. The image processing unit detects, in the image, a first portion of the first edge located on the end side of the first edge, and a second portion of the first edge located away from the first portion in a first direction. The determination unit determines the state of the object based on the distance between the first portion and the second portion in a height direction perpendicular to the one surface. Effect of the Invention

[0006] The state of the article is determined based on the distance in the height direction between the first portion and the second portion of the first edge portion, thereby making it possible to accurately detect the presence or absence of irregularities on one surface of the article. [Brief description of the drawings]

[0007] [Figure 1] FIG. 1 is a plan view showing the configuration of the inspection device. [Diagram 2] FIG. 2 is a perspective view showing an article. [Diagram 3] FIG. 3 is a diagram showing an image capturing unit that captures an image of a plurality of items housed in an exterior member. [Figure 4] FIG. 4 is a diagram showing an illumination unit that illuminates a plurality of items housed in an exterior member. [Diagram 5] FIG. 5 is a block diagram showing a hardware configuration of the information processing device. [Figure 6] FIG. 6 is a block diagram showing the software configuration of the information processing device. [Figure 7] FIG. 7 is a diagram for explaining the flow of inspecting an item. [Figure 8] FIG. 8 is a perspective view showing a modified example of an article. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. Note that the components described in the embodiment are merely examples, and are not intended to limit the scope of the present invention. In the drawings, the dimensions and numbers of each part may be exaggerated or simplified as necessary for ease of understanding.

[0009] <1. First embodiment> Fig. 1 is a plan view showing the configuration of the inspection device 1. Fig. 2 is a perspective view showing an article 9. Fig. 3 is a diagram showing an imaging unit 3 that images a plurality of articles 9 housed in an exterior member 110. Fig. 4 is a diagram showing an illumination unit 5 that illuminates a plurality of articles 9 housed in an exterior member 110.

[0010] As shown in FIG. 1, the inspection device 1 includes an imaging unit 3, an irradiation unit 5, and an information processing device .

[0011] The inspection device 1 inspects the object 9 for the presence or absence of unevenness. The inspection device 1 inspects the object 9 transported in one direction by the transport conveyor 100. In the following description, the direction in which the transport conveyor 100 transports the object 9 is referred to as the "transport direction." The transport direction is the horizontal direction. The horizontal direction perpendicular to the transport direction is referred to as the "width direction."

[0012] <Photography Team> The photographing unit 3 has a plurality of cameras. Specifically, the photographing unit 3 has a first camera 31, a second camera 32, a third camera 33, and a fourth camera 34. The first camera 31 to the fourth camera 34 are positioned on one widthwise side with respect to the article 9. That is, the photographing unit 3 photographs the article 9 from one widthwise side.

[0013] The second camera 32 is positioned away from the first camera 31 in the width direction. The third camera 33 is positioned away from the first camera 31 in the conveying direction. The fourth camera 34 is positioned away from the third camera 33 in the width direction. In addition, the fourth camera 34 is positioned away from the second camera 32 in the conveying direction. The third camera 33 is positioned between the first camera 31 and the second camera 32 in the width direction.

[0014] As shown in FIG. 1, the transport conveyor 100 transports an object 9. The transport conveyor 100 transports, for example, one exterior member 110 housing a plurality of objects 9. The exterior member 110 has, for example, a box shape with an open top. The exterior member 110 can house a total of 12 objects 9 arranged, for example, in three rows in the transport direction and four rows in the width direction. As shown in FIG. 3 and FIG. 4, when a plurality of objects 9 are housed in the exterior member 110, an upper surface 9S of the object 9 is covered with a transparent film 112.

[0015] The first camera 31 to the fourth camera 34 simultaneously photograph different articles 9. In detail, the first camera 31 photographs the articles 9 in the first row in the width direction. The second camera 32 photographs the articles 9 in the third row in the width direction. The third camera 33 photographs the articles 9 in the second row in the width direction. The fourth camera 34 photographs the articles 9 in the fourth row in the width direction.

[0016] The first camera 31 and the second camera 32 are fixed at the same position in the conveying direction. The article 9 photographed by the first camera 31 and the article 9 photographed by the second camera 32 are at the same position in the conveying direction. The third camera 33 and the fourth camera 34 are fixed at the same position in the conveying direction. The article 9 photographed by the third camera 33 and the article 9 photographed by the fourth camera 34 are at the same position in the conveying direction.

[0017] The distance between the first camera 31 and the third camera 33 in the conveying direction matches the distance between the articles 9 in the conveying direction in the exterior member 110. The distance between the first camera 31 and the second camera 32 in the width direction matches the distance between the articles 9 in the width direction in the exterior container.

[0018] The photographing unit 3 can simultaneously photograph, with the first camera 31 to the fourth camera 34, four articles 9 located at different positions in the conveyance direction or width direction at approximately the same angle.

[0019] The third camera 33 is disposed away from the first camera 31 in the conveying direction and disposed between the first camera 31 and the second camera 32 in the width direction. This allows multiple cameras to be disposed in a limited range in the width direction.

[0020] The first camera 31 to the fourth camera are electrically connected to the information processing device . The first camera 31 to the fourth camera output the captured images to the information processing device .

[0021] In the inspection device 1, one camera (first camera 31 to fourth camera 34) is associated with one article 91. This allows multiple articles 91 to be inspected under the same inspection conditions. In addition, since multiple articles 91 can be inspected in parallel, the inspection time can be shortened.

[0022] <Irradiation unit> The irradiation unit 5 irradiates light onto the object 9. The irradiation unit 5 has, for example, a first light source unit 51 and a second light source unit 52. The first light source unit 51 and the second light source unit 52 are located vertically above the object 9 transported by the transport conveyor 100. In the transport direction, the second light source unit 52 is located upstream of the first light source unit 51. The distance between the first light source unit 51 and the second light source unit 52 in the transport direction matches the distance between the objects 9 contained in the exterior member 110 in the transport direction. The first light source unit 51 and the second light source unit 52 are positioned with a shift in the width direction. The distance between the first light source unit 51 and the second light source unit 52 in the width direction matches the distance between the objects 9 contained in the exterior member 110 in the width direction. The irradiation unit 5 can simultaneously irradiate light from the same angle to each of the objects 9 photographed by the first camera 31 to the fourth camera 34 using the first light source unit 51 and the second light source unit 52. Note that the irradiation unit 5 may be composed of only one light source.

[0023] <Structure of the item> The article 9 is, for example, a paper container capable of containing liquid. The article 9 is a polyhedron, specifically, a rectangular parallelepiped that is a hexahedron. The article 9 is formed by folding a sheet of paper into a three-dimensional shape. For water resistance, the inner surface of the article 9 may be coated with polyethylene or the like.

[0024] The article 9 has an upper surface 9S (one surface). The upper surface 9S has a first region 91 and a second region 92. The first region 91 has a linear first edge E91. The first edge E91 is a portion of the first region 91 that is overlapped on the upper side of the second region 92 (first overlapping portion). The first edge E91 is located higher in the height direction than the second region 92. In other words, the first edge E91 forms a step between the first region 91 and the second region 92.

[0025] At least a first edge E91 of the first region 91 is in contact with the second region 92. The first edge E91 of the upper surface 9S is more likely to have unevenness than other parts of the article 9. As described below, the inspection device 1 inspects the presence or absence of unevenness on the upper surface 9S based on the first edge E91.

[0026] The first region 91 has a third region 93 and a fourth region 94. The third region 93 has a linear second edge portion E92. The second edge portion E92 extends in a direction intersecting the first edge portion E91 (in this example, in a direction substantially perpendicular to the first edge portion E91).

[0027] For example, when the contents contained in the article 9 expand, the linear first edge E91 may be deformed into a convex shape. Also, when an external force is applied to the article 9, the linear first edge E91 may be deformed into a concave shape. Therefore, the inspection device 1 inspects the unevenness of the article 9 by detecting the first edge E91, as described below.

[0028] The second edge E92 is a portion (second overlapping portion) of the third region 93 overlapped on the upper side of the fourth region 94. The second edge E92 is located higher than the fourth region 94 in the height direction. In other words, the second edge E92 forms a step between the third region 93 and the fourth region 94. At least the second edge E92 of the third region 93 is in contact with the fourth region 94.

[0029] The article 9 has a printed portion 96 on the upper surface 9S. The printed portion 96 is a colored portion that is colored with a chromatic or achromatic color. The printed portion 96 is a character, a symbol, or a picture (design). The irradiation unit 5 may emit infrared rays. The irradiation unit 5 may preferably emit near-infrared rays having a wavelength of 850 nm to 860 nm. When the irradiation unit 5 emits infrared rays, the printed portion 96 can be made lighter or erased in the image captured by the imaging unit 3 (the original image 301 or the corrected image 311 shown in FIG. 7). Therefore, even if the article 9 has the printed portion 96 on the upper surface 9S, the presence or absence of unevenness on the upper surface 9S can be well inspected.

[0030] The transport conveyor 100 transports the article 9 so that a first edge E91 of the article 9 is parallel to the transport direction and a second edge E92 of the article 9 is parallel to the width direction (see FIG. 1). Furthermore, each of the first camera 31 to fourth camera 34 of the photographing unit 3 can photograph the entire top surface 9S of one article 9.

[0031] The irradiation unit 5 irradiates the upper surface 9S of each article 9 with light from the first region 91 side toward the second region 92 side. That is, the irradiation unit 5 emits light toward one side in the width direction toward the upstream side in the conveying direction (see FIG. 1). Also, in the width direction parallel to the upper surface 9S, the first edge E91 of each article 9 is located between the irradiation unit 5 and the photographing unit 3. In this case, the light incident on the first edge E91 is reduced, so that the reflection of light at the first edge E91 is suppressed. As a result, the brightness of the first edge E91 is reduced in the image acquired by the photographing unit 3, so that the image of the first edge E91 can be made clear.

[0032] Moreover, the irradiation unit 5 irradiates the upper surface 9S of each article 9 with light from the third region 93 side toward the fourth region 94 side and from the third region 93 side toward the second region 92 side. That is, the irradiation unit 5 emits light toward one side in the width direction toward the upstream side in the conveying direction (see FIG. 1). Furthermore, in the conveying direction parallel to the upper surface 9S, the second edge E92 of each article 9 is located between the irradiation unit 5 and the photographing unit 3. In this case, the light incident on the second edge E92 is reduced, so that the reflection of light at the second edge E92 is suppressed. Therefore, in the image acquired by the photographing unit 3, the brightness of the second edge E92 is reduced, so that the image of the second edge E92 can be made clear.

[0033] The inclination of the optical axis A5 of the first light source unit 51 or the second light source unit 52 of the irradiation unit 5 (angle β that the optical axis A5 forms with respect to the top surface 9S) is smaller than the inclination of the imaging axis A3 of the first camera 31 to the fourth camera 34 of the photographing unit 3 (angle α that the imaging axis A3 forms with respect to the top surface 9S). As a result, even if the reflectivity of the top surface 9S of the article 9 is high or the top surface 9S is covered with a film 112 with high reflectivity, the light reflected by the top surface 9S or the film 112 and incident on the photographing unit 3 can be reduced. As a result, the first edge E91 can be made clear in the image acquired by the photographing unit 3.

[0034] <Information processing device> Fig. 5 is a block diagram showing a hardware configuration of the information processing device 7. Fig. 6 is a block diagram showing a software configuration of the information processing device 7.

[0035] The information processing device 7 has a configuration as a general computer. In detail, the information processing device 7 has a processor 71, a RAM 72, a storage unit 73, a device interface 74, and a communication interface 75. The hardware elements of the information processing device 7 are electrically connected via a bus 76.

[0036] The information processing device 7 is electrically connected to the photographing unit 3, the input unit 77, and the display 78 via the device interface 74. The input unit 77 is, for example, an input device such as a keyboard or a mouse. The display 78 displays various information such as characters and images. The display 78 may be a touch panel and function as the input unit. The information processing device 7 is also connected to a network (for example, a local area network or the Internet) via the communication interface 75.

[0037] The processor 71 includes, for example, a CPU or a GPU. The storage unit 73 is, for example, a non-transitory recording medium such as a hard disk drive. The storage unit 73 stores a program P. The processor 71 executes the program P to realize various functions of the information processing device 7. Specifically, as shown in FIG. 6, the information processing device 7 functions as an image processing unit 711 and a determination unit 713. Note that the information processing device 7 may include a dedicated circuit such as an ASIC (Application Specific Integrated Circuit) that realizes each functional block shown in FIG. 6.

[0038] The image processing unit 711 detects multiple parts of the article 9 by processing the image captured by the imaging unit 3. The determination unit 713 determines the state of the article 9 based on the positions of the multiple parts detected by the image processing unit 711. Specific processing contents of the image processing unit 711 and the determination unit 713 will be described later.

[0039] <Processing of image processing unit and judgment unit>

[0040] FIG. 7 is a diagram for explaining the flow of inspecting an item 9. An original image 301 shown in FIG. 7 is an image obtained by the photographing unit 3 photographing the item 9. Hereinafter, in the original image 301, the horizontal direction is referred to as the "first direction" and the vertical direction is referred to as the "second direction". The first direction is a direction corresponding to the conveying direction. The left side of the first direction corresponds to the downstream side of the conveying direction, and the right side of the first direction corresponds to the upstream side of the conveying direction.

[0041] When the article 9 is arranged at an angle to the conveying direction, the image of the article 9 in the original image 301 is tilted with respect to the first direction. Then, the orientation of the image of the first edge portion E91 in the original image 301 varies, which may reduce the inspection accuracy of unevenness. For this reason, the image processing unit 711 performs a rotation correction process to align the orientation of the article 9 between the original images 301. Specifically, the image processing unit 711 rotates the original image 301 so that the image of the first edge portion E91 in the original image 301 is aligned with the first direction. The rotation correction process generates a corrected image 311 in which the orientation of the article 9 in the original image 301 is corrected.

[0042] In the rotation correction process, the image processing unit 711 detects a first line segment L1 corresponding to a part of the first edge E91 in the first detection frame F1 of the original image 301. The first detection frame F1 is an area having a predetermined size and shape (e.g., rectangular). The position of the first detection frame F1 is set appropriately. The first line segment L1 corresponds to, for example, a middle part of the first edge E91 located between both ends of the first edge E91 in the first direction.

[0043] The image processing unit 711 detects the second edge portion E92 in the original image 301. Specifically, the image processing unit 711 detects a second line segment L2 corresponding to a part of the second edge portion E92 within the second detection frame F2 of the original image 301. The second detection frame F2 has a predetermined size and shape (e.g., rectangular). The position of the second detection frame F2 may be set relatively based on the position of the first line segment L1.

[0044] The image processing unit 711 detects the first edge E91 based on the first line segment L1 and the second line segment L2. Specifically, the image processing unit 711 detects the third line segment L3, which is the middle part of the first edge E91, within the third detection frame F3. In the first direction, the width of the third detection frame F3 may be smaller than the width of the first detection frame F1.

[0045] The image processing unit 711 detects a fourth line segment L4, which is the left end portion (part of the side on the downstream side in the transport direction) of the upper surface 9S in the original image 301, based on the second line segment L2 and the third line segment L3.

[0046] The image processing unit 711 detects a fifth line segment L5, which is the right end portion (part of the side on the upstream side in the transport direction) of the upper surface 9S in the original image 301, based on the second line segment L2 and the third line segment L3.

[0047] The image processing unit 711 detects, in the original image 301, a sixth line segment L6 that is a part of the first edge E91 near the left end, based on the second line segment L2 and the third line segment L3.

[0048] The image processing unit 711 detects, in the original image 301, a seventh line segment L7 that is a part of the first edge E91 near the right end, based on the second line segment L2 and the third line segment L3.

[0049] The image processing unit 711 obtains the position of a left intersection C1 in the original image 301, which is the intersection between an extension of the fourth line segment L4 and an extension of the sixth line segment L6.

[0050] The image processing unit 711 obtains the position of a right intersection C2 in the original image 301, which is the intersection between an extension of the fifth line segment L5 and an extension of the seventh line segment L7.

[0051] The image processing unit 711 rotates the original image 301 based on the left intersection point C1 and the right intersection point C2. Specifically, the image processing unit 711 calculates the inclination of a straight line passing through the left intersection point C1 and the right intersection point C2. Then, the image processing unit 711 rotates the original image 301 around the center point between the left intersection point C1 and the right intersection point C2 so that the inclination of the straight line coincides with the first direction. In this way, the image processing unit 711 generates a corrected image 311 in which the inclination of the article 9 is corrected.

[0052] The image processing unit 711 detects, in the corrected image 311, an eighth line segment L8 that is part of the second edge E92.

[0053] The image processing unit 711 detects a first portion 911, which is a part of the first edge E91, based on the position of the eighth line segment L8 in the corrected image 311. The first portion 911 is, for example, a portion located at the center of the first edge E91. The position of the center of the first edge E91 is found based on the eighth line segment L8.

[0054] The image processing unit 711 detects a second portion 912, which is a part of the first edge E91, based on the position of the eighth line segment L8 in the corrected image 311. The second portion 912 is located farther in the first direction than the first portion 911. The second portion 912 is, for example, a portion close to the left end of the first edge E91.

[0055] The image processing unit 711 obtains a distance d1 in the second direction between the first portion 911 and the second portion 912 in the corrected image 311. This distance d1 in the second direction corresponds to the distance in the height direction (height difference) between the center portion (first portion 911) and the portion toward the left end (second portion 912) of the first edge E91.

[0056] The determination unit 713 determines whether or not there is unevenness in the first edge E91 based on the distance d1. For example, the determination unit 713 determines whether the distance d1 is within a predetermined range. If the determination unit 713 determines that the distance d1 is within the predetermined range, the determination unit 713 determines that the article 9 is a non-defective product (i.e., there is no unevenness). On the other hand, if the determination unit 713 determines that the distance d1 is outside the predetermined range, the determination unit 713 determines that the article 9 is a defective product (i.e., there is unevenness).

[0057] <Effects> The inspection device 1 determines the state of the article 9 based on the distance d1 in the height direction between the first portion 911 and the second portion 912 of the first edge E91. This makes it possible to accurately detect the presence or absence of unevenness on the top surface 9S of the article 9.

[0058] The image processing unit 711 detects the first portion 911 and the second portion 912 of the first edge E91 based on the position of the second edge E92. Therefore, the first portion 911 and the second portion 912 can be identified more accurately than when the position of the second edge E92 is not used as a reference.

[0059] Furthermore, since the second edge E92 extends in a direction intersecting the first edge E91, the first portion 911 and the second portion 912 can be detected more appropriately than if the second edge E92 extended parallel to the first edge E91.

[0060] The image processing unit 711 calculates the distance d1 between the first portion 911 and the second portion 912 in the corrected image 311 obtained by rotating and correcting the original image 301. Therefore, the inspection device 1 can appropriately inspect the presence or absence of unevenness (for example, the presence or absence of expansion) on the upper surface 9S.

[0061] When the irradiation unit 5 irradiates infrared rays, the printed portion 96 can be made faint or erased in the image captured by the imaging unit 3 (the original image 301 or the corrected image 311 shown in FIG. 7). Therefore, even if the article 9 has the printed portion 96 on the upper surface 9S, the first portion 911 and the second portion 912 of the first edge portion E91 can be accurately identified. This allows the presence or absence of unevenness on the upper surface 9S to be favorably inspected.

[0062] The inspection device 1 can capture an image with the influence of the film 112 suppressed. This allows the top surface 9S of the article 9 to be captured clearly. Also, the first edge portion E91 in the captured original image 301 can be made clear. This allows the first portion 911 and the second portion 912 to be detected with high accuracy based on the first edge portion E91. Therefore, the presence or absence of unevenness in the article 91 can be favorably inspected.

[0063] <2. Modification> Although the embodiment has been described above, the present invention is not limited to the above, and various modifications are possible.

[0064] For example, the number of cameras included in the inspection device 1 is not limited to four. For example, the inspection device 1 may include only one camera.

[0065] It is not essential that a portion of the first region 91 overlaps the second region 92 on the upper surface 9S of the article 9. For example, a first edge E91 of the first region 91 and an edge of the second region 92 may face each other. In this case, the first edge E91 of the first region 91 may be located at the same height as the edge of the second region 92.

[0066] 8 is a perspective view showing a modified article 9A. As in the upper surface 9S of the article 9A, the first region 91A may be overlapped with the second region 92 so that the first region 91A covers the entire second region 92. Also, for example, the first region 91A may or may not have a third region 93 and a fourth region 94. When the first region 91A does not have the third region 93 and the fourth region 94, the second edge portion E92 may not be provided, and the upper surface 9S may be a flat surface.

[0067] The direction in which the transport conveyor 100 transports the articles 9 may be reversed from the direction shown in FIG.

[0068] When making a judgment based on the distance d1, a threshold value may be set. The judgment unit 713 may make a judgment based on the threshold value.

[0069] Although the present invention has been described in detail, the above description is merely illustrative in all respects, and the present invention is not limited thereto. It is understood that countless variations not illustrated can be envisioned without departing from the scope of the present invention. The configurations described in the above embodiments and variations can be appropriately combined or omitted as long as they are not mutually contradictory. [Industrial Applicability]

[0070] The present invention can be used in an inspection device. [Explanation of symbols]

[0071] 1. Inspection equipment 3. Photography Department 5. Irradiation unit 7. Information processing equipment 9 Goods 9S top 31 Camera No. 1 32 Second Camera 33 Third Camera 91 1st area 92 Second area 93 Third area 94 4th area 96 Printing Department 301 Original Image 311 Corrected Image 711 Image Processing Unit 713 Judgment section 911 Part 1 912 Part 2 E91 First edge E92 2nd edge

Claims

1. An inspection device for inspecting an object formed by folding paper into a three-dimensional shape, comprising: An imaging unit that images an item; an image processing unit that detects a plurality of parts of the article by processing the image captured by the imaging unit; a determination unit that determines a state of the article based on the positions of the plurality of parts detected by the image processing unit, the article is a polyhedron; At least one surface of the article has a first region; The first region has a linear first edge, The image processing unit, in the image, A first portion of the first edge portion located on an end side of the first edge portion; a second portion of the first edge portion that is spaced apart from the first portion in a first direction; The determination unit determines a state of the article based on a distance between the first portion and the second portion in a height direction perpendicular to the one surface, the one surface of the article having a second region; An inspection device, wherein the first edge of the first region is a first overlapping portion overlapping the second region.

2. 2. The inspection device according to claim 1, An inspection device, wherein the first overlapping portion is located at a higher position in the height direction than the second region.

3. The inspection device according to claim 1 or 2, The first region has a third region, The third region has a linear second edge portion, The image processing unit includes: Detecting the second edge in the image; An inspection device that detects the first portion and the second portion based on a position of the second edge.

4. The inspection device according to claim 3 , wherein the second edge portion extends in a direction intersecting with the first edge portion.

5. The inspection device according to claim 3 or 4, The first region has a fourth region, the second edge portion is a second overlapping portion overlapping the fourth region, An inspection device, wherein the second edge portion is located at a higher position in the height direction than the fourth region.

6. 3. The inspection device according to claim 2, An irradiation unit that irradiates the article with light, The irradiating unit irradiates the light from the first region toward the second region, An inspection device, wherein the first edge portion is located between the irradiation unit and the imaging unit in a direction parallel to the one surface.

7. 6. The inspection device according to claim 5, An irradiation unit that irradiates the article with light, the irradiating unit irradiates the light from the third region side toward the fourth region side and from the third region side toward the second region side, An inspection device, wherein in a direction parallel to the one surface, the second edge portion is located between the irradiation unit and the imaging unit.

8. The inspection device according to claim 6 or 7, The irradiation unit is an inspection device that irradiates infrared rays.

9. The inspection device according to any one of claims 6 to 8, An inspection apparatus, wherein a tilt of an optical axis of the irradiation unit with respect to the first region is smaller than a tilt of an imaging axis of the imaging unit with respect to the first region.

10. The inspection device according to any one of claims 1 to 9, The image processing unit includes: Rotating and correcting the image according to the inclination of the article in the image captured by the photographing unit; An inspection device that detects the first portion and the second portion in the corrected image that has been rotationally corrected.

11. The inspection device according to any one of claims 1 to 10, A conveying mechanism capable of simultaneously conveying a plurality of the articles along a predetermined conveying direction, The imaging unit includes: A first camera; a second camera positioned away from the first camera in a width direction perpendicular to the conveying direction.

12. 12. The inspection device according to claim 11, The imaging unit includes: The inspection apparatus further comprises a third camera positioned away from the first camera in the conveying direction.

13. 13. The inspection device according to claim 12, An inspection device, wherein the third camera is positioned between the first camera and the second camera in the width direction.

Images