JP4671992B2 - Appearance inspection apparatus and image processing method thereof - Google Patents

Description

  The present invention relates to an appearance inspection apparatus for inspecting a state of a peripheral surface of an object to be inspected and an image processing method thereof.

As an appearance inspection apparatus for inspecting the appearance of an object to be inspected, for example, there is one described in Patent Document 1. In Patent Document 1, a chip component is rotated by a predetermined angle in conjunction with a revolving movement of a predetermined angle, and a top image of the chip component on a feeder is captured by a first camera, and then the side surface of the chip component is detected. An appearance inspection apparatus is described in which an image is picked up by second to fifth cameras, and a lower surface image of the chip part is picked up by a sixth camera to sequentially judge the quality of the chip part.
In the appearance inspection apparatus described in Patent Document 1, since a CCD camera that images one surface of a chip component at a time is used, when inspecting each surface of an object to be inspected, it is necessary to image multiple times. . In this appearance inspection apparatus, not only the object to be inspected is rotated but also revolved, so that a plurality of cameras are installed according to the number of times of imaging.

  If a plurality of cameras are installed, the scale of the apparatus increases and the cost of the apparatus also increases. Therefore, if the camera is a line camera in which imaging elements are arranged in a line, and the object to be inspected is rotated and the surrounding surface is scanned with the line camera, and the captured images are combined, the entire surface to be inspected is obtained. Can be imaged as a single image, so that the appearance of the inspection object can be inspected with one line camera. Such appearance inspection apparatuses are described in Patent Documents 2 and 3.

  In Patent Document 2, the surface of the inspection object is imaged about two rotations by a line sensor in which photoelectric elements such as CCDs are arranged one-dimensionally in the vertical direction while rotating the inspection object around the rotation axis. Then, by extracting the feature points from the obtained image data using the template matching method, the same pattern as the reference image is found, the inspection image for one rotation is cut out, and the presence or absence of print defects on the outer surface of the inspection object A printing inspection apparatus for a cylindrical container for discriminating the above is described.

  Further, in Patent Document 3, a container moving on a conveyor is rotated by a head unit that moves at the same speed together with the conveyor, and the outer peripheral surface of the rotated container is imaged about 1.4 times by a line scan camera, A device for inspecting the outer periphery of a cylindrical container is described in which a video taken by a camera is compared with a reference image by an image processing unit to determine whether the image is good or bad.

JP 2000-203713 A JP 2000-103039 A JP 2005-227257 A

  In order to inspect the inspection surface, it suffices if there is an image for one round of the inspection object. However, in Patent Documents 2 and 3, the inspection surface of the rotating inspection object is equivalent to two or 1.4 laps By taking an image, it is possible to prevent the image of the print pattern to be inspected and the image of the label from being interrupted.

  However, if the image to be inspected is imaged for two or 1.4 laps so that the image to be inspected is not interrupted, extra time is required to rotate the inspection object, which requires time. In addition, since the size of the captured image increases, it takes more time to process the image.

  This increase in time is not a problem when the number of objects to be inspected is small, but is a serious problem when inspecting products manufactured in large quantities.

  Therefore, an object of the present invention is to provide an appearance inspection apparatus and an image processing method thereof that can inspect the appearance state of an object to be inspected in a short inspection time.

  An appearance inspection apparatus according to the present invention is an appearance inspection apparatus for inspecting a state of an inspection object on an inspection surface of an object to be inspected, and includes a turntable for rotating the inspection object and at least one turn of the inspection surface. A line camera that sequentially captures and outputs each as a scanned image, and an original image obtained by combining the scanned images as an inspection surface image, and whether or not the inspection target image included in the inspection surface image is divided. When the determination is made and it is determined that the inspection target image is divided, the inspection surface image is divided into two from the position corresponding to the reference position of the inspection surface, and each of the inspection surface images divided into two is divided. The image processing unit includes an image processing unit that replaces the positions and combines them to form an inspection image.

  Further, the image processing method of the appearance inspection apparatus according to the present invention includes a turntable for rotating an object to be inspected, and a line camera that sequentially images at least one inspected surface of the object to be inspected and outputs each as a scanned image. And an image processing unit that generates an inspection image for inspecting the state of the inspection object on the inspection surface based on the inspection surface image, and an original image obtained by combining the scanned images with each other An image processing method for an appearance inspection apparatus comprising: a division determination step for determining whether or not an inspection target image included in the inspection surface image is divided; and the inspection target image is divided If determined, an image dividing step of dividing the inspection surface image from a position corresponding to a reference position of the inspection surface, and an inspection image obtained by combining the respective positions of the divided inspection surface images Characterized in that it comprises an image combining step that.

  As the object to be inspected is mounted on the turntable and rotates, the peripheral surface as the surface to be inspected is sequentially imaged by the line camera. The line camera outputs an image obtained by sequentially capturing the surface to be inspected for at least one round as a scanned image. The image processing unit first sets an original image obtained by combining the scanned images as an inspection surface image. Since the surface image to be inspected is an image that is sequentially captured by a line camera from an arbitrary location, the image to be inspected that is an image of the inspection target on the surface to be inspected is divided into two parts by starting imaging from the middle. It may be in a state. Therefore, the image processing unit determines whether or not the inspection target image included in the inspection surface image is divided, and then the image processing unit determines that the inspection target image is divided, The surface image is divided from the position corresponding to the reference position of the surface to be inspected. Then, the positions of the divided surface images to be inspected are interchanged to form an inspection image. By doing so, in order not to rotate the object to be inspected much, even if the inspection target image to be inspected is an divided image, the inspection target image can be made an original continuous image. Therefore, even if the image of the surface to be inspected is not included in the original image continuously for one round, the inspection can be performed, so that it is necessary to rotate extra to inspect the object to be inspected. Absent.

  The image processing unit uses an image obtained by combining more than one round of scanned images by the line camera as an original image, and a cut-out image obtained by cutting out one round from the original image is a surface image to be inspected Is desirable. When imaging the entire surface to be inspected by rotating the turntable, if there is uneven rotation in the rotation of the turntable, even if the original image for one round is divided into two parts and the positions are changed and combined, , The joints may not match. Therefore, the image processing unit generates an original image from a scanned image obtained by capturing more than one round of the surface to be inspected, and a cut-out image obtained by cutting out one round from the original image is used as the surface to be inspected. An image for one continuous round of the inspection surface can be obtained with certainty.

The turntable is provided with marks that are arranged at equal intervals along the direction in which the surface to be inspected rotates, and is imaged together with the surface to be inspected by the line camera. A function of detecting the length of one round of the surface to be inspected based on the number of captured marks and cutting out one round of the surface to be inspected based on the length from the original image is provided. Is desirable.
If there is uneven rotation on the turntable, the length in the time direction of the sequentially captured original images changes. Then, the length of one round of the surface to be inspected is determined in advance, and one round of the surface to be inspected is cut out from the original image with the determined length, and the respective positions of the divided cut-out images are exchanged and combined. If the inspection image is used, there is a possibility that the joint portion does not match. Therefore, if there are marks arranged at equal intervals on the turntable, even if there is uneven rotation on the turntable, the interval between the captured images changes according to the rotation unevenness, but the number of marks does not change. Therefore, the cut image can be generated accurately by determining the length of one round of the surface to be inspected from the number of marks.

  It is desirable that the mark has a predetermined width along a direction in which the surface to be inspected rotates. When generating a cutout image, it is necessary to accurately detect the position of the mark. However, when imaging the surface to be inspected with a line camera, if the rotation of the turntable is uneven, the mark in the original image may be distorted or missing, and the mark position may not be detected accurately. . If the mark has a predetermined width along the direction in which the surface to be inspected rotates, the mark is imaged firmly in the original image captured by the line camera, so the position of the mark can be detected accurately Can do.

  It is desirable that a rotary encoder that outputs rotation information for each predetermined angle according to the rotation of the turntable is provided, and the line camera images the surface to be inspected based on the rotation information. Even if there is uneven rotation on the turntable, the line camera images the surface to be inspected based on the rotation information output from the rotary encoder, so that distortion of the original image due to uneven rotation can be suppressed.

  In the present invention, since the inspection image can be inspected even if the image of the inspection surface is not included in the original image continuously for one round, an extra rotation is performed to inspect the inspection object. There is no need. Therefore, this invention can test | inspect the state of the external appearance of a to-be-inspected object in short inspection time.

  A label inspection apparatus which is an example of an appearance inspection apparatus according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a schematic plan view of a label inspection apparatus according to an embodiment of the present invention. FIG. 2 is a schematic perspective view of the label inspection apparatus shown in FIG. FIG. 3 is a view for explaining a pressing unit of the label inspection apparatus shown in FIG. FIG. 4 is a diagram for explaining the rotary encoder of the label inspection apparatus shown in FIG. FIG. 5 is a block diagram for explaining the configuration of the inspection apparatus main body of the label inspection apparatus shown in FIG.

The label inspection apparatus inspects the label affixed state and the printed state on the label using a label affixed to the peripheral surface (inspected surface) of a shochu bottle as an inspection object.
As shown in FIG. 1, the label inspection apparatus 1 includes a carry-in unit 2 that conveys a bottle B filled with shochu, a carry-out unit 3 that carries the inspected bottle B, and a bottle B that is carried by the carry-out unit 3. A defective product transport unit 4 that extracts and transports a bottle B determined to be defective from the inside, and an inspection apparatus main body 5 that inspects the bottle B are provided.

  The carry-in unit 2 has an upstream conveyor 21 that carries the bottle B and conveys it, and a spiral groove is formed on the entire peripheral surface of the rod-like body from the upstream in order to keep the front and back distances of the bottle B being conveyed constant. To the opposite side of the timing screw 22 across the upstream conveyor 21 to guide the bottle B conveyed by the timing screw 22 and the timing screw 22 that gradually spreads and finally becomes constant. A guide plate 23 provided and an upstream star wheel 24 for taking the bottle B into the inspection apparatus main body 5 in synchronization with the bottles B aligned by the timing screw 22 are provided.

  The carry-out unit 3 includes a downstream star wheel 31 that takes out the bottle B that has been inspected from the inspection apparatus main body 5, and a downstream conveyor 32 that conveys the taken out bottle B.

  The defective product transport unit 4 includes a sorting unit 41 that pushes out the bottles B on the downstream conveyor 32, and a defective product transport conveyor 42 that transports the bottles B whose appearance is judged to be defective by the sorting unit 41. Yes.

  The inspection apparatus body 5 includes an inspection stage 51 that takes in and moves the bottle B from the upstream star wheel 24, a line camera 52 that images the peripheral surface of the bottle B on the inspection stage 51 as an inspection surface, and a line camera 52. And a control unit 53 that processes the image picked up by the above and performs inspection determination.

  The inspection stage 51 is arranged so as to draw a circle on the index table 511 that revolves the bottle B clockwise in plan view, and rotates the bottle B by rotating horizontally around the axis of the bottle B. An inspection table 512 to be rotated and three rollers 513 for rotating the inspection table 512 are provided.

  Below the index table 511, a motor (not shown) that generates continuous rotation, and the index table 511 is driven by converting the rotation from the motor into intermittent rotation that stops every predetermined angle. An index unit (not shown) is provided. Above the index table 511, there is provided a pressing unit 514 (see FIG. 3) that presses the bottle B revolving while rotating on the inspection table 512 from above. The pressing unit 514 is provided so as to be movable up and down on a circular support plate 511 b disposed on a support column 511 a erected from the center of the index table 511.

  As shown in FIG. 4, the inspection table 512 is a turntable that mounts the bottle B and rotates. In the upper part of the peripheral surface of the inspection table 512, 24 circular marks 512a are arranged at equal intervals over the entire circumference. It is desirable that the marks 512a have such an interval that the images are not picked up in a state where the marks 512a are connected to each other due to uneven rotation of the inspection table 512 because the spaces between the marks 512a are too narrow.

  The three rollers 513 are disk-shaped members provided with an annular elastic member at the peripheral edge in order to rotationally drive the inspection table 512 by friction, and the drive shaft 513a is connected to a motor (not shown). A rotary encoder 515 (see FIG. 4) that outputs rotation information for each predetermined angle is attached to the roller 513 positioned in front of the line camera 52. The rotary encoder 515 is connected to the control unit 53 via a communication unit (not shown).

  The line camera 52 is a camera that images the inspection surface of the bottle B for each line in the vertical direction and outputs it to the control unit 53 as a scanned image by arranging the image pickup elements in a line.

  As shown in FIG. 5, the control unit 53 includes a control unit main body 531 that performs overall control of the entire label inspection apparatus 1, a display unit 532 that displays an inspection status and is configured by a CRT, LCD, etc., a keyboard, a mouse, and the like The input part 533 comprised by this is provided.

  The control unit main body 531 inputs a scanned image from the line camera 52, performs image processing, and performs an inspection based on the inspection image, an image processing unit 531a that outputs an inspection image in which the label image is not divided. And an inspection processing unit 531b that notifies the sorting unit 41 of the defective product transporting unit 4 of the result. The control unit 53 can be a computer that can function as the image processing unit 531a and the inspection processing unit 531b by operating the inspection program.

  The operation of the label inspection apparatus 1 according to the embodiment of the present invention configured as described above will be described with reference to the drawings.

  First, as shown in FIG. 1, the bottle B is conveyed in a state of being connected to the upstream conveyor 21. While being supported by the guide plate 23, the bottle B reaches the upstream star wheel 24 with the front and rear intervals being made constant by the timing screw 22. Next, the bottle B is transferred to the inspection table 512 by the upstream side star wheel 24. The transferred bottle B moves to the position of the first roller 513 by intermittent rotation of the index table 511. Then, when the first roller 513 comes into contact with the peripheral surface of the inspection table 512, the inspection table 512 starts to rotate. Then, when the inspection table 512 moves to the position of the second roller 513 by the intermittent rotation of the next index table 511, the second roller 513 and the inspection table 512 come into contact with each other, and the inspection table 512 is further rotated. .

  A considerable weight is added to the inspection table 512 because the bottle B filled with the shochu is mounted. Therefore, stable rotation can be obtained by applying rotation to the inspection table 512 in advance before imaging by the line camera 52. Then, the inspection table 512 is moved to the position of the third roller 513 by the intermittent rotation of the next index table 511, so that the third roller 513 becomes a more stable rotation state.

  Rotation information is output from the rotary encoder 515 to the control unit 53 every time the roller 513 positioned in front of the line camera 52 has a predetermined angle. When receiving the rotation information, the control unit 53 instructs the line camera 52 to image the peripheral surface of the bottle B. That is, the rotation information from the rotary encoder 515 is the timing at which the shutter of the line camera 52 is released. Accordingly, the line camera 52 can be accurately imaged according to the rotation of the inspection table 512.

  Each time the line camera 52 captures an image, the captured image is output to the control unit 53 as a scanned image. The image processing unit 531a of the control unit 53 shown in FIG. 5 combines the scanned images to form an original image, and generates an inspection image for inspecting the state of the label on the inspection surface based on the original image.

  Here, the image processing method of the image processing unit 531a will be described in detail based on FIG. 6 and FIG. FIG. 6 is a flowchart for explaining the image processing method of the image processing unit 531a. FIGS. 7A to 7E are diagrams illustrating examples of images processed by the image processing unit.

  First, the image processing unit 531a sequentially captures and combines the scanned images output from the line camera 52 into a memory, thereby forming one original image G1 as shown in FIG. 7A (step S10). In this case, if the inspection table 512 rotates clockwise in plan view, the scanned images are combined so as to be stacked from the left end to the right end of the original image G1. In the present embodiment, the original image G1 is generated based on the scanned image of the bottle B for about 1.2 turns.

  Since the front label, the rear label, and the shoulder label, which are inspection targets, are attached to the shochu bottle B, the front label image L1 and the rear label image L2 are respectively included in the original image G1 as inspection target images. And a shoulder label image L3. Further, since the mark 512a arranged on the peripheral surface of the inspection table 512 is provided along the direction in which the inspection table 512 rotates, the mark image M is also included along the time direction in which the image is captured. In the original image G1, the position where the line camera 52 starts imaging is not determined for each bottle B, so the front label image L1 and the shoulder label image L3 are separated.

  Next, the image processing unit 531a cuts out one round of the outer peripheral surface (inspected surface) from the original image G1, and generates a cut-out image G2 as shown in FIG. (Image cutting step). In the present embodiment, the scanned image of about 1.2 rounds of the bottle B is combined to form the original image G1, but the original image that combines the scanned images of the round of the bottle B is used as the inspection surface image. Thus, the image cutting step may be omitted. However, when the original image G1 is generated with only one scan image, the roller 513 is moved when the inspection table 512 and the roller 513 that rotates the inspection table 512 start to contact or during contact. By sliding, the rotation of the inspection table 512 becomes uneven, and a difference can be made between the rotation angle of the inspection table 512 and the rotation angle of the roller 513 detected by the rotary encoder 515. If so, there is a possibility that it is less than one round of the peripheral surface of the bottle B. Therefore, by capturing a scan image for 1.2 laps more than one round to obtain an original image G1, and cutting out one round of the peripheral surface of the bottle B from the original image G1 to obtain a cut-out image G2, it is ensured. The original image G1 including one round of the peripheral surface of the bottle B can be obtained.

  At this time, the original image G1 may be cut out with the number of dots corresponding to the length of one circumference of the peripheral surface of the bottle B to generate a cutout image. The length in the time direction may differ from the actual one round of the bottle B. In that case, there is a possibility that it is less than one round of the peripheral surface of the bottle B.

  Therefore, the image processing unit 531a detects one round of the bottle B by counting the mark images M. In the present embodiment, since 24 marks 512a are provided on the peripheral surface of the inspection table 512 at equal intervals, the length of 24 mark images M is one round of the bottle B (step S20). ). Accordingly, from the left end of the original image G1 in which about 28 mark images M shown in FIG. 7A are captured, the mark image M whose center is captured is taken as the left end mark image M1, and the 24th from the left end mark image M1. The cut image G2 as shown in FIG. 7B is accurately obtained by cutting out the mark image M as the right end mark image M2 from the original image G1 from the center of the left end mark image M1 to the center of the right end mark image M2. (Step S30). That is, the left end mark image M1 and the right end mark image M2 are the same mark 512a.

  The mark 512a is formed in a circular shape. However, the mark 512a may be a triangle, a quadrangle, a polygon more than that, a star or an irregular shape, or a simple scale. However, if thin lines are arranged at regular intervals like a scale, if the inspection table 512 has the rotation unevenness as described above, the inspection table 512 may be distorted or removed. In the present embodiment, since the mark 512a has a predetermined width along the direction in which the peripheral surface of the bottle B, which is the surface to be inspected, rotates, the mark 512a is marked even if the inspection table 512 has uneven rotation. Since the original image G1 is firmly captured as the image M, there is no distortion or missing. Therefore, the image processing unit 531a can accurately detect the position of the mark 512a. In order to prevent distortion and omission of the mark 512a, it is sufficient that the width is at least two lines of the line camera 52.

  Next, the image processing unit 531a determines whether or not the front label image L1, the back label image L2, and the shoulder label image L3, which are inspection target images included in the cut image G2, are divided (partition determination step). ). Whether or not the inspection target image is divided is determined by determining a distance from a predetermined reference position of the bottle B to the right end or the left end of the cut image G2. As shown in FIG. 7C, for example, the upper left corner K1 of the front label image L1 is detected by pattern matching, and the distance to the right end of the cutout image G2 is determined. Similarly, the lower right corner K2 of the back label image L2 is detected by pattern matching, and the distance to the left end of the cutout image G2 is determined. If the determined distance is shorter than the predetermined distance, it is determined that the inspection target image is divided (step S40). In the cutout image G2 shown in FIG. 7C, since it is determined that either the front label image L1 or the back label image L2 is divided, the cutout image G2 is not subjected to image processing as it is. Recognize that it cannot be used as an inspection image. If it is determined that the inspection target image is not divided, the image processing unit 531a uses the inspection surface image, which is the cut image G2, as it is as the inspection image.

  In the present embodiment, the upper left corner K1 of the front label image L1 and the lower right corner K2 of the rear label image L2 are used as reference patterns for pattern matching. However, the bottle B in which the inspection target image is not divided. The determination may be made by preparing an image of the entire peripheral surface of the image in advance and comparing this image as a reference pattern. However, if the image of the entire peripheral surface of the bottle B is used as a reference pattern, not only a large amount of memory is required, but also time is required for image processing. Therefore, it is desirable to use a partial pattern as a reference pattern.

  Next, when it is determined that the inspection target image is divided, the cut-out image G2 is divided (image division step). In the present embodiment, since the intermediate position between the front label and the back label is set as the reference position, as shown in FIG. 7D, the upper left corner K1 of the front label image L1 and the lower right of the back label image L2 are displayed. An intermediate position with respect to the corner K2 is divided as a position corresponding to the reference position to obtain divided images D1 and D2 (step S50). The reference position may be any position as long as it does not divide the inspection target image, but the positions of the corner K1 and the corner K2 can be determined when determining the division of the inspection target image. Therefore, a faster execution speed can be realized by setting the intermediate position as the reference position.

  Finally, as shown in FIG. 7E, the image processing unit 531a generates the inspection image T by switching the positions of the divided images D1 and D2 divided from the intermediate positions of the corner K1 and the corner K2. Image combining step). In this way, the image processing unit 531a can generate an image for one round of the peripheral surface of the bottle B (step S60).

  Next, based on the inspection image T generated by the image processing unit 531a, the inspection processing unit 531b performs an inspection. In the inspection, whether the inclination of the front label image L1, the back label image L2, and the shoulder label image L3 is within an allowable range, whether the positional relationship between the front label image L1, the back label image L2, and the shoulder label image L3 is shifted, Compared with the front label image, back label image, and shoulder label image when applied correctly, turning and smearing, incorrect labeling, correct barcode, date of manufacture Check whether or not is printed.

  In the present embodiment, the angle information output from the rotary encoder 515 is only the timing at which the line camera 52 captures an image. However, each time interval at which the angle information is output is measured and based on a deviation from the standard time. Thus, the deviation in the time direction of the inspection image T may be corrected. By doing so, the shift | offset | difference of the length of the time direction of the front label image L1, the back label image L2, or the shoulder label image L3 can be corrected.

  If the inspection processing unit 531b detects a defect, it notifies the sorting unit 41 of the defective product transporting unit 4 so that the bottle B that is sequentially moved to the downstream side is transferred to the defective product transporting conveyor 42 as a non-defective product. Sort out.

  As described above, even if the front label image L1, the back label image L2, and the shoulder label image L3 included in the original image G1 are divided, the inspection target image can be an original continuous image. Therefore, the inspection can be performed even if the image of the peripheral surface of the bottle B is not included in the original image in advance for one round. Accordingly, since it is not necessary to rotate the bottle B excessively in order to inspect the bottle B, it is possible to inspect the appearance of the bottle B in a short inspection time.

  In the present embodiment, the bottle B whose inspection surface is a cylindrical shape has been described as an example of the inspection object. However, the inspection object is not limited to the cylindrical shape, and the inspection object is rotated regardless of whether it is a rectangular parallelepiped or an irregular shape. If it is possible to obtain an image in which the peripheral surface is developed into a flat surface by taking an image with a line camera, the inspection can be similarly performed with a small number of rotations.

  Further, in the label inspection apparatus 1 according to the present embodiment, the bottle B is rotated by the inspection table 512 while revolving by the index table 511, but is rotated while the inspection object is being conveyed by the linear conveyor. It is good also as a thing like the outer peripheral surface test | inspection apparatus of the patent document 3, for example, which test | inspects the state of the test surface which is a surrounding surface of a to-be-inspected object.

  In the present invention, not only the label inspection apparatus for inspecting the label applied to the peripheral surface of the object to be inspected, but also the product name, display of contents, date of manufacture, etc. are directly printed on the surface to be inspected. It is suitable for an appearance inspection apparatus and an image processing method for inspecting the appearance of an inspected object.

1 is a schematic plan view of a label inspection apparatus according to an embodiment of the present invention. It is a schematic perspective view of the label inspection apparatus shown in FIG. It is a figure for demonstrating the press unit of the label inspection apparatus shown in FIG. It is a figure for demonstrating the rotary encoder of the label inspection apparatus shown in FIG. It is a block diagram for demonstrating the structure of the inspection apparatus main body of the label inspection apparatus shown in FIG. It is a flowchart for demonstrating the image processing method of an image process part. (A)-(E) are figures which show an example of the image which an image process part processes.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Label inspection apparatus 2 Carry-in part 21 Upstream conveyor 22 Timing screw 23 Guide plate 24 Upstream star wheel 3 Carry-out part 31 Downstream star wheel 32 Downstream conveyor 4 Defective article conveyance part 41 Sorting part 42 Defective article conveyance conveyor 5 Inspection apparatus Main body 51 Inspection stage 511 Index table 511a Support column 511b Support plate 512 Inspection table 512a Mark 513 Roller 513a Drive shaft 514 Press unit 515 Rotary encoder 52 Line camera 53 Control unit 531 Control unit main body 531a Image processing unit 531b Inspection processing unit 533 Input unit G1 Original image G2 Cut image L1 Front label image L2 Rear label image L3 Shoulder label image M Mark image M1 Left end mark image M2 Right end mark image T Inspection image

Claims (3)

In the visual inspection device that inspects the state of the inspection object on the inspection surface of the inspection object,
A line camera for outputting each sequentially captured pre Symbol test surface as a scanned image,
The marks that are arranged at equal intervals along the direction in which the surface to be inspected rotates and are imaged together with the surface to be inspected by the line camera have a width that is equal to or more than two line widths of the scanned image captured by the line camera. A turntable for rotating the object to be inspected.
An image obtained by combining more than one round of scanned images by the line camera is used as an original image, and the length of one round of the surface to be inspected is detected based on the number of marks captured in the original image. Whether or not the inspection target image included in the inspection surface image is divided by cutting out one turn of the inspection surface based on the length from the image and using the cut image as the inspection surface image , When the inspection target is determined by pattern matching and it is determined that the inspection target image is divided, the inspection surface image is divided into two from the position corresponding to the reference position of the inspection surface. An appearance inspection apparatus comprising: an image processing unit that replaces and combines the positions of the inspected surface images to form an inspection image. A rotary encoder that outputs rotation information for each predetermined angle according to the rotation of the turntable is provided,
Said line camera, the appearance inspection apparatus of claim 1 Symbol placement is for imaging the inspection surface based on the rotation information. And a turntable for rotating the object to be inspected, a line camera for outputting each sequentially images the inspected surface of the object to be inspected as a scanned image, the original image obtained by combining the scanned image respectively inspected surface image, An image processing method of an appearance inspection apparatus comprising: an image processing unit that generates an inspection image for inspecting a state of an inspection object on the inspection surface based on the inspection surface image;
Marks arranged on the turntable at equal intervals along the direction in which the surface to be inspected rotates, and provided with a width equal to or more than two line widths of a scanning image captured by the line camera. Imaging with the surface to be inspected by the line camera;
An image obtained by combining more than one round of scanned images by the line camera as an original image, and detecting the length of one round of the surface to be inspected based on the number of marks captured in the original image;
Cutting out one round of the surface to be inspected based on the length from the original image and making the cut-out image as an inspected surface image;
Whether the inspection target image included in the surface image to be inspected is divided or not is determined by pattern matching the inspection target ,
When it is determined that the inspection target image is divided, an image dividing step of dividing the inspection surface image from a position corresponding to a reference position of the inspection surface;
An image processing method for an appearance inspection apparatus, comprising: an image combining step in which the positions of the divided surface images to be inspected are replaced and combined to form an inspection image.

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