JP2004271238A - Method and apparatus for inspecting package - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inspection method capable of removing the effects of patterns in the surface of a package in the inspection method for inspecting the outer periphery of the package on the basis of images acquired by imaging the package. <P>SOLUTION: A pouch 100 formed in a bag shape by layering a sheet 101b is imaged by a camera 21 from a direction in which the sheet 101b is layered. The pouch 100 is inspected on the basis of an imaged image 200 in this inspection apparatus 6. The inspection apparatus 6 is provided with both a back light 22 for irradiating the pouch 100 with light from behind the pouch 100 when viewed from the camera 21 and a control device 12 for determining the appropriateness of the location or shape of the periphery of the pouch 100 on the basis of a silhouette image 201 of the pouch 100 imaged by the camera 21 by receiving light from the back light 22. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method and an apparatus for inspecting a package.
[0002]
[Prior art]
As a technique for inspecting the outer periphery of the package, the opening of the package having a welding layer inside the opening is heat-sealed, and the amount of the molten layer that has melted out of the opening is determined based on an image of the package. Inspection is known (Patent Document 1). Further, there is also known an apparatus that inspects the inclination of the spout with respect to the pouch main body and the presence / absence of turning-up of the opening of the pouch main body based on an image obtained by imaging the pouch with the spout (Patent Document 2).
[0003]
[Patent Document 1]
JP 2001-315718 A [Patent Document 2]
Japanese Patent Application Laid-Open No. 2000-226002
[Problems to be solved by the invention]
However, patterns, characters, and the like are printed on the surface of the package, and it is necessary to remove these effects in order to specify the outer periphery of the package based on the image.
[0005]
Therefore, an object of the present invention is to provide an inspection method for inspecting the outer periphery of a package based on an image of the package, which can remove the influence of a pattern on the surface of the package. .
[0006]
[Means for Solving the Problems]
Hereinafter, the present invention will be described. In addition, in order to facilitate understanding of the present invention, reference numerals in the accompanying drawings are added in parentheses, but the present invention is not limited to the illustrated embodiment.
[0007]
According to the inspection method of the present invention, the package (100) formed by overlapping the sheets (101b) to form a bag is imaged by the imaging means (21) from the direction in which the sheets are superimposed, and the captured image (200) In the inspection method for inspecting the package based on the above), the package is irradiated with light from behind the package as viewed from the imaging unit, and the irradiated light is received by the imaging unit and The above-described object is achieved by providing a step of acquiring an image (201) of a silhouette of a package and a step of determining whether the position or shape of the outer periphery of the package is appropriate based on the image of the silhouette. .
[0008]
According to the inspection method of the present invention, the imaging unit receives the light emitted by the rear illumination unit and images the silhouette of the package. That is, in the captured image, the luminance of the image corresponding to the package is lower than that of the image of the surrounding area. For this reason, it is possible to set a threshold value of the luminance which separates the image of the portion corresponding to the package from the image of the surrounding area. Therefore, even when a pattern or a character is printed on the surface of the package, it is possible to remove the influence and accurately specify the outer periphery of the package. Also, if the brightness of the rear lighting means is increased and the difference in brightness between the image of the portion corresponding to the package and the image of the surrounding area is increased, a position where the rate of change in the brightness distribution is large is defined as the outer periphery of the package. It is also possible to increase the accuracy of the specified image processing.
[0009]
In the inspection method of the present invention, the package is inserted into a package body (101) and an opening (101a) of the package body, and a spout (102) having higher light transmittance than the package body. In the step of acquiring the image of the silhouette, the image of the silhouette may be acquired while irradiating the inside of the spout with light. In this case, since the imaging unit captures the silhouette of the package while receiving the light of the spout illumination unit that has passed through the spout, the image of the portion corresponding to the spout is brighter than the image of the portion corresponding to the package body. Will be higher. For this reason, it is possible to set a threshold value of the luminance that separates the image of the part corresponding to the spout from the image of the part corresponding to the package body, and can accurately specify the spout and the package body, respectively. It is possible.
[0010]
Another inspection method of the present invention includes a package body (101) and a spout (102) inserted into the opening (101a) of the package body and having higher light transmission than the package body. In the inspection method of imaging the package (100) by the imaging means (21) and inspecting the package based on the captured image (200), the inside of the spout is irradiated with light and the irradiation is performed. A step of receiving light by the imaging means to obtain an image (201a) of the silhouette of the opening; and a step of determining whether the shape of the outer periphery of the package body is appropriate based on the image of the silhouette. This solves the above-mentioned problem.
[0011]
According to another inspection method of the present invention, since the imaging unit receives the light of the spout illumination unit that has passed through the spout and images the silhouette of the opening, the boundary between the spout and the package body has different brightness. It can be specified as the boundary of the region. Therefore, it is possible to accurately perform image processing such as edge detection and pattern matching, and to accurately specify the shape of the boundary line.
[0012]
The inspection apparatus of the present invention captures an image of a package (100) formed by stacking sheets (101b) in a bag shape from an overlapping direction of the sheets by an imaging unit (21), and the captured image (200). In the inspection device (6) for inspecting the package body based on the above, the rear illumination means (22) for irradiating the package body with light from behind the package body as viewed from the imaging means; And a determination unit (12) for determining whether the position or shape of the outer periphery of the package is appropriate based on an image (201) of the silhouette of the package captured by the image capturing unit by receiving the light of (1). Solves the above-described problem.
[0013]
According to the inspection apparatus of the present invention, the above-described inspection method of the present invention can be realized.
[0014]
In the inspection device of the present invention, the package has a package main body (101) and a spout (102) inserted into an opening (101a) of the package main body, and the discriminating means includes the silhouette. The suitability of the relative position between the package body and the spout may be determined based on the image of (1). In this case, it is possible to inspect the shape of the outer periphery of the package by determining whether the relative position between the package body and the spout is appropriate. The suitability of the relative position between the package body and the spout may be inspected in the spout insertion direction, may be inspected in a direction orthogonal to the insertion direction, or inspected for the inclination of the spout with respect to the package body. May be. Further, the spout may have higher light transmission than the package body.
[0015]
In the inspection device of the present invention, the package is inserted into the package body (101) and the opening (101a) of the package body, and the spout (102) having higher light transmittance than the package body. And a spout illuminating means (23) for irradiating the inside of the spout with light, wherein the discriminating means receives light from the spout illuminating means and based on the silhouette image taken by the imaging means. Thus, the suitability of the position or shape of the outer periphery of the package may be determined. In this case, it is possible to realize a preferable mode of irradiating the inside of the spout with light in the above-described inspection method of the present invention.
[0016]
In the inspection device of the present invention, the package is transported by a predetermined transport unit (2), and the imaging unit receives light from the rear illumination unit across a transport path of the package by the transport unit. And the determining unit may determine whether the transport position of the package is appropriate based on the image of the silhouette. In this case, it is possible to avoid inconvenience caused by a shift in the transport position when performing various processes on the package transported by the transport unit. For example, when heat-sealing a package that is being conveyed by the conveyance means, if the conveyance position is shifted, the resin part that is not the part that should be heated is heated, and the melted resin adheres to the seal head. The inconvenience of doing so occurs. However, such an inconvenience can be avoided by inspecting the transport position of the package using the inspection device of the present invention before heat sealing. When the package is formed of a plurality of members, such as a pouch with a spout, the transport position may be inspected for each of the members.
[0017]
In the inspection device of the present invention, the determination unit may determine whether the relative position between the package body and the spout is appropriate based on the image of the silhouette. In this case, it is possible to inspect the shape of the outer periphery of the package by determining whether the relative position between the package body and the spout is appropriate. The suitability of the relative position between the package body and the spout may be inspected in the spout insertion direction, may be inspected in a direction orthogonal to the insertion direction, or inspected for the inclination of the spout with respect to the package body. May be.
[0018]
In the inspection device of the present invention, the determination unit may determine whether the shape of the opening of the package body is appropriate based on an image of the silhouette of the opening. In a package with a spout, for example, when the spout is inserted into the package body, the spout may be caught in the opening, causing the opening to be turned or torn. However, by irradiating the inside of the spout with light, it is possible to illuminate the turning and tearing from the inside and image the silhouette thereof. Therefore, according to the inspection device of the present invention, it is possible to effectively inspect for turning up and tearing.
[0019]
In the inspection device of the present invention, the determination unit specifies an apparent width of the package projected on the imaging unit based on the image of the silhouette, and determines the apparent width of the package based on the specified width. The presence or absence of twist may be determined. When the package is twisted, the apparent width of the package projected on the imaging means becomes narrow. Therefore, by specifying the width of the package projected on the imaging means, it is possible to inspect the twist of the package.
[0020]
Another inspection device of the present invention includes a package body (101) and a spout (102) inserted into the opening (101a) of the package body and having higher light transmission than the package body. A spout illumination for irradiating light to the inside of the spout in an inspection device (6) for imaging the package (100) by an imaging means (21) and inspecting the package based on the imaged image (200). Determining the suitability of the outer shape of the package body based on the means (23) and the image (201a) of the silhouette of the opening imaged by the imaging means by receiving light from the spout lighting means. The above-mentioned problem is solved by providing the determination means (12) for performing the determination.
[0021]
According to another inspection apparatus of the present invention, the above-described other inspection method of the present invention can be realized.
[0022]
In another inspection apparatus of the present invention, the determination unit may determine whether the shape of the opening of the package body is appropriate based on the image of the silhouette. In this case, the imaging unit receives the light of the spout illumination unit that has passed through the spout and images the silhouette of the opening, so that the boundary between the spout and the opening is specified. Thus, the appropriateness of the shape of the opening is accurately determined.
[0023]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 shows a spout mounting device 1 to which the inspection device of the present invention is applied. The spout attachment device 1 is for manufacturing the pouch 100 with a spout by sealing the opening 101a with the spout 102 inserted into the opening 101a of the pouch main body 101 (see FIG. 2). The pouch body 101 is formed in a bag shape by, for example, laminating a sheet 101b on which aluminum foil is laminated, and can block light. The spout 102 is formed, for example, by injection molding a resin, and is capable of transmitting light.
[0024]
As shown in FIG. 1, the spout attachment device 1 includes a transport device 2 that rotates in a circumferential direction indicated by an arrow y1. The transport device 2 includes a plurality of arms 3 extending in the radial direction. As shown in FIG. 2, the arms 3... 3 are provided with suction tools 3a, 3a and holding tools 3b, 3b, which are arranged on the outer peripheral end so as to face each other with the pouch 100 interposed therebetween. The suction tools 3a, 3a and the holding tools 3b, 3b located in the blind spot of the pouch 100 are not shown.), And the pouch body 101 and the spout 102 are sandwiched and held by the suction tools 3a, 3a, and the holding tools 3b, 3b. Is possible. Further, the suction tools 3a, 3a and the holding tools 3b, 3b are provided so as to hold the pouch 100 with the sheet stacking direction of the pouch main body 101 directed in the radial direction of the transport device 2. Therefore, the transport device 2 can transport the pouch 100 in the direction indicated by the arrow y2 along the outer periphery.
[0025]
In FIG. 1, a pouch main body supply device 4 that supplies a pouch main body 101 to the conveyance device 2 and a spout 102 are inserted into an opening 101 a of the pouch main body 101 being conveyed to the conveyance device 2 around the conveyance device 2. A spout supply device 5, a first inspection device 6 for inspecting the pouch 100, a first sealing device 7 for heat-sealing a portion of the opening 101a of the pouch main body 101 that is not bulged by the spout 102, and an opening of the pouch main body 101 A second sealing device 8 for heat-sealing a portion of the part 101a having a bulge due to the spout 102, a cooling sealing device 9 for cooling the opening 101a of the pouch body 101, a second inspection device 10 for inspecting the pouch 100, A discharge device 11 for taking out the pouch 100 from the transfer device 2 and discharging the same is provided. In addition, the spout mounting device 1 includes a control device 12 that controls operations of the transport device 2 and each of the devices 4 to 11.
[0026]
The transfer device 2 transfers the pouch 100 while rotating at a constant speed. Each of the devices 4 to 11 executes a predetermined process in synchronization with the rotation of the transport device 2. In addition, each of the sealing devices 7 to 9 is provided so as to be able to reciprocate along the outer periphery of the transfer device 2, and seals the pouch 100 while rotating at the same speed as the transfer device 2 in the rotation direction of the transfer device 2. Then, when the sealing is completed, the conveying device 2 moves in a direction opposite to the rotation direction. Each of the sealing devices 7 to 9 includes eight sealing machines 13... 13, 14... 14, 15... 15, and is configured to be able to simultaneously seal eight arms 3. The other devices 4 to 6, 10, and 11 are provided at fixed positions. Note that the transport device 2 may be intermittently rotated.
[0027]
FIG. 2 is a diagram illustrating a configuration of the first inspection device 6. The second inspection device 10 has the same configuration. The first inspection device 6 includes an inspection unit 20A that inspects the pouch 100 from the inner peripheral side of the transport device 2 and an inspection unit 20B that inspects the pouch 100 from the outer peripheral side of the transport device 2 (hereinafter, both are inspected). When there is no need to distinguish them, they are simply referred to as “inspection units 20”. In FIG. 2, the inspection unit 20A is located on the upstream side of the inspection unit 20B in the transport direction of the pouch 100, but any one may be located on the upstream side.
[0028]
The inspection unit 20 includes a camera 21 as an imaging unit, a backlight 22 as a back illumination unit, and a top spotlight 23 as a spout illumination unit. The camera 21 is configured as, for example, a CCD camera. The camera 21 and the backlight 22 are arranged with the conveyance path of the pouch 100 interposed therebetween. In the inspection unit 20A, the camera 21 is disposed on the inner peripheral side of the transport device 2, and in the inspection unit 20B, the camera 21 is disposed on the outer peripheral side of the transport device 2. The top spotlight 23 is disposed above the transport path of the pouch 100 and can irradiate the inside of the spout 102 with light. The camera 21, the backlight 22, and the top spotlight 23 are connected to the control device 12 (not shown), and their operations are controlled by the control device 12.
[0029]
The usage state of the inspection unit 20 as described above will be described. During the operation of the spout mounting device 1, the backlight 22 and the top spotlight 23 are constantly turned on. When the pouch 100 being transported by the transport device 2 reaches below the top spot 23, the camera 21 captures an image of the pouch 100. At this time, the image captured by the camera 21 is as shown in FIG.
[0030]
FIG. 3 is a diagram conceptually showing an image 200 captured by the camera 21. The camera 21 receives the light emitted from the backlight 22 and images the silhouette of the pouch 100. For this reason, in the image 200, the luminance of the pouch image 201 corresponding to the pouch 100 is lower than that of the surrounding area 202 over the entirety. For this reason, it is possible to set a threshold value of luminance for separating the pouch image 201 from the surrounding area 202. Therefore, even if a pattern or a character is printed on the surface of the pouch 100, it is possible to remove the influence and to accurately specify the outer periphery of the pouch 100. If the luminance of the backlight 22 is increased and the luminance difference between the pouch image 201 and the area 202 is increased, image processing for detecting a position where the rate of change in the luminance distribution is large as the outer periphery of the pouch 100 (edge detection). It is also possible to increase the accuracy of
[0031]
The brightness of the spout portion 201b of the pouch image 201 is higher than that of the main body portion 201a when the camera 21 receives the light of the top spotlight 23 transmitted through the spout 102.
[0032]
As for the inspection of the outer periphery of the pouch 100 using the inspection device 6, various items can be inspected. For example, the inspection items described below may be inspected.
[0033]
FIG. 4A shows a case in which the transfer positions of the pouch main body 101 and the spout 102 are checked for appropriateness. For example, the inspection device 6 detects the positions of the upper end portion 101c and both end portions 101d, 101d of the pouch main body 101 by edge detection. Then, it is determined whether or not the upper end portion 101c and the both end portions 101d and 101d are within the allowable ranges p1 set in the Y-axis direction and the allowable ranges p2 and p3 set in the X-axis direction, respectively. The X axis and the Y axis are coordinate systems fixed to the spout mounting device 1. In this way, the appropriateness of the transfer position of the pouch 101 is determined. Similarly, the transfer position of the spout 102 depends on whether the upper end 102a and the side end 102b of the spout 102 are within the allowable range p4 set in the Y-axis direction and the allowable range p5 set in the X-axis direction, respectively. Determine the suitability.
[0034]
For example, when the pouch main body supply device 4 or the spout supply device 5 attaches the pouch main body 101 or the spout 102 to the conveyance device 2, the holding position of the pouch 100 by the suction tool 3 a and the holding tool 3 b is shifted. It is caused by things. In this case, for example, when heat sealing is performed on the pouch 100 with the transport position shifted by the first sealing device 7, the spout 102 is directly heated by the seal head, and the melted portion adheres to the seal head. Disadvantages occur. However, it is possible to avoid the above-described inconvenience by inspecting the transport position of the pouch main body 101 and the spout 102 by the first inspection device 6 and not performing sealing when the transport position is not within the allowable range. It is possible. Further, since the inspection is performed before the sealing, the pouch main body 101 and the spout 102 that have been discharged as defective due to the shift of the transport position can be supplied again to the transport device 2 for use.
[0035]
Note that the position of the pouch main body 101 and the spout 102 may be detected by using another image processing method such as pattern matching that is compared with images of the pouch main body 101 and the spout 102 recorded in the control device 12 in advance. The inspection reference position may be arbitrarily determined, such as by inspecting the center of gravity of the pouch main body 101 instead of the edge of the upper end portion 101a or the like. The inspection direction is not limited to the X-axis direction and the Y-axis direction, and may be determined as needed. For example, the inclination may be inspected.
[0036]
FIG. 4B shows a case where the appropriateness of the relative position between the pouch main body 101 and the spout 102 is inspected in the X-axis direction. For example, the inspection device 6 specifies the outer circumference of the pouch main body 101 and the spout 102 by edge detection, and specifies the center of gravity 101e of the pouch main body 101 and the center of gravity 102c of the spout 102 based on the specified outer circumference. Then, it is determined whether or not the shift amount s1 in the X-axis direction between the center of gravity position 101e and the center of gravity position 102c is within a predetermined allowable range. Thereby, the suitability of the relative position between the pouch main body 101 and the spout 102 is inspected.
[0037]
The detection of the positions of the pouch main body 101 and the spout 102 is not limited to edge detection, and other image processing methods such as pattern matching may be used. As shown in FIG. 3, in the pouch image 201, the spout portion 201b has higher luminance than the main body portion 201a, so that the centroid positions 101e and 102c may be respectively specified by binarized area measurement. The inspection reference position may be determined arbitrarily, such as by inspecting the relative position between the edges of the pouch body 101 and the spout 102 instead of the relative position between the centers of gravity.
[0038]
FIG. 5A shows a case where the suitability of the relative position between the pouch main body 101 and the spout 102 is checked in the Y-axis direction and the rotation direction. For example, the inspection device 6 specifies the position of the upper end 101c of the pouch main body 101 and the positions of both ends 102e and 102f of the flange 102d of the spout 102 by edge detection. Next, distances s2 and s3 between the upper end portion 101c and both end portions 102e and 102f are specified, respectively. Then, by judging whether or not the distances s2 and s3 are within a predetermined allowable range, the suitability of the relative position in the Y-axis direction is checked. Further, by comparing the distance s2 and the distance s3, the suitability of the relative position (inclination) in the rotation direction is checked.
[0039]
Note that the reference position of the inspection is not limited to the upper end portion 101c and both end portions 102e and 102f, and may be arbitrarily determined, such as using the center of gravity as the reference position. Other image processing methods such as pattern matching and binarized area measurement may be used for position detection.
[0040]
FIG. 5B shows a case where the opening 101a of the pouch main body 101 is inspected for turning up or tearing. The opening 101a is turned or torn, for example, when the spout 102 is inserted into the opening 101a by the spout supply device 5 and the spout 102 is caught on the upper end 101c.
[0041]
The inside of the spout 102 is illuminated by a top spotlight 23. For this reason, when the opening 101a is turned up or torn, as shown in FIG. 5B, it is possible to illuminate the torn or the like from the inside and image the silhouette thereof. For this reason, the boundary line L1 between the spout 102 and the pouch main body 101 can be specified as a boundary line between regions having different luminances. Therefore, it is possible to accurately perform image processing such as edge detection and pattern matching, and accurately specify the shape of the boundary line L1. Since the brightness of the spout 102 is higher than that of the pouch main body 101 over the entire area, image processing such as binarized area measurement is performed, and the presence or absence of a break or the like is accurately determined based on the area ratio between the spout 102 and the pouch main body 101. Can also be determined. In addition, since the inspection device 6 includes the inspection unit 20A for inspecting the outer side of the transport path of the pouch 100 and the inspection unit 20B for inspecting the inner side of the pouch 100, it is necessary to inspect both sides of the pouch 100 for breakage or the like. Is possible. It is desirable that the inspection unit 20A and the inspection unit 20B be arranged at appropriate intervals so that the backlights 22 do not interfere with each other during imaging.
[0042]
FIG. 6 shows a case where the torsion of the pouch main body 101 is inspected. The twist may be detected by utilizing the fact that when the pouch main body 101 is twisted, the apparent width of the pouch main body 101 projected on the camera 21 is reduced. For example, the inspection device 6 specifies the positions of both side ends 101d, 101d by edge detection, and based on the positions, the width W1 near the upper end of the pouch main body 101 projected on the camera 21 and the vicinity of the center of the pouch main body 101. Is specified. Next, the width W1 is subtracted from the width W2 to calculate a difference dW between the two. When the difference dW is larger than a predetermined reference value, it is determined that the pouch main body 101 is twisted. Even when the pouch main body 101 is not twisted, the width W1 is smaller than the width W2 due to the swelling of the spout 102 because the spout 102 is inserted into the opening 101a. Therefore, when setting a reference value, it is necessary to consider the influence of this bulge.
[0043]
Note that the position of the side end portion 101c may be detected by using another image processing method such as pattern matching. Not only the width near the upper end and the vicinity of the center, but also the inspection may be performed based on the width of an arbitrary position, and it is not necessary to compare the measured widths. It may be compared with the width.
[0044]
The present invention is not limited to the above embodiments, and may be implemented in various forms as long as the technical idea of the present invention is substantially the same.
[0045]
The camera 21 does not need to image the entire pouch 100, and may image the pouch 100 in a range necessary for the inspection. For example, only the vicinity of the upper end of the pouch main body 101 may be imaged.
[0046]
Regarding the arrangement of the camera 21 and the backlight 22, any arrangement is possible as long as the camera 21 can image the silhouette of the pouch 100 due to the light emitted by the backlight 22. For example, a mirror that reflects the light of the backlight 22 toward the camera 21 may be provided between the pouch 100 and the camera 21 in order to secure a shooting distance from the camera 21 to the pouch 100. In this case, the camera 21 and the backlight 22 need not be arranged so as to sandwich the transport path of the pouch 100. Similarly, the top surface spot 23 may be arranged at any position as long as the inside of the spout 102 can be irradiated.
[0047]
The camera 21 only needs to be able to image the silhouette of the package, and for example, a phototube camera may be used.
[0048]
The backlight 22 and the top spotlight 23 need only be able to emit light when the camera 21 captures an image. Therefore, a strobe-type backlight 22 and a top spotlight 23 may be used, and light may be emitted only when the camera 21 captures an image.
[0049]
An image in a state where the top surface spotlight 23 does not irradiate the inside of the spout 102 with light is generated, and an image in a state where the light is radiated is generated. You may use it. Alternatively, the outer periphery of the pouch body 101 or the spout 102 may be specified by performing image processing for obtaining a difference between the two images.
[0050]
The attachment position of the spout 102 is not limited to the upper center of the pouch main body 101, and the spout 102 may be provided at a corner of the pouch main body 101. Further, it may be provided on the side portion, the bottom portion, or the like, and the spout 102 may not be provided. The pouch 100 is not limited to a flat pouch, and can be applied to various shapes such as a gusset type provided with a gore on the side, a stand type provided with a bottom and made free standing, and a bottle type. The pouch main body 101 may be one in which one sheet is folded and overlapped.
[0051]
【The invention's effect】
As described above, according to the present invention, the imaging unit receives the light emitted from the rear illumination unit and images the silhouette of the package. Therefore, in the captured image, the luminance of the image corresponding to the package is lower than that of the image of the surrounding area. In other words, it is possible to set a threshold value of luminance for separating the image of the portion corresponding to the package from the image of the surrounding area. Therefore, even when a pattern or a character is printed on the surface of the package, it is possible to remove the influence and accurately specify the outer periphery of the package. Also, if the brightness of the rear lighting means is increased and the difference in brightness between the image of the portion corresponding to the package and the image of the surrounding area is increased, a position where the rate of change in the brightness distribution is large is defined as the outer periphery of the package. It is also possible to increase the accuracy of the specified image processing.
[Brief description of the drawings]
FIG. 1 is a diagram showing a spout mounting device to which an inspection device of the present invention is applied.
FIG. 2 is a diagram showing an inspection device of the spout mounting device of FIG. 1;
FIG. 3 is a view showing an image captured by a camera of the inspection apparatus in FIG. 2;
FIG. 4 is a diagram showing inspection items inspected by the inspection device of FIG. 2;
FIG. 5 is a diagram showing inspection items inspected by the inspection device of FIG. 2;
FIG. 6 is a diagram showing inspection items inspected by the inspection device of FIG. 2;
[Explanation of symbols]
6 Inspection device 12 Control device 21 Camera 22 Backlight 23 Top spotlight 100 Pouch 101 Pouch body 101a Opening 101b Sheet 102 Spout 200 Image 201 Pouch image

Claims (12)

In an inspection method of imaging a package formed by stacking sheets into a bag shape from an orientation in which the sheets are stacked by an imaging unit and inspecting the package based on the captured image,
A step of irradiating the package with light from behind the package as viewed from the imaging unit, and receiving the irradiated light by the imaging unit to obtain an image of the silhouette of the package,
Based on the image of the silhouette, determining the suitability of the position or shape of the outer periphery of the package,
An inspection method, comprising: The package has a package body and a spout that is inserted into the opening of the package body and has higher light transmission than the package body.
The inspection method according to claim 1, wherein in the step of acquiring the image of the silhouette, the image of the silhouette is acquired while irradiating the inside of the spout with light. A package body, and a package having a spout that is inserted into the opening of the package body and has higher light transmissivity than the package body is imaged by an imaging unit, and based on the imaged image, In the inspection method of inspecting the package, while irradiating light to the inside of the spout, receiving the irradiated light by the imaging means to obtain an image of the silhouette of the opening,
Based on the image of the silhouette, determining the suitability of the shape of the outer periphery of the package body,
An inspection method, comprising: In an inspection apparatus for imaging a package formed by stacking sheets into a bag shape by an imaging unit from a direction in which the sheets are stacked, and inspecting the package based on the captured image,
Back lighting means for irradiating the package with light from behind the package as viewed from the imaging means,
Based on an image of the silhouette of the package captured by the imaging unit by receiving light from the rear illumination unit, a determination unit that determines whether the position or shape of the outer periphery of the package is appropriate or not,
An inspection apparatus comprising: The package has a package body and a spout inserted into an opening of the package body,
The inspection device according to claim 4, wherein the determination unit determines whether the relative position between the package body and the spout is appropriate based on the image of the silhouette. The package has a package body and a spout that is inserted into the opening of the package body and has higher light transmission than the package body.
A spout illuminating unit that irradiates light to the inside of the spout,
The said determination means determines the suitability of the position or shape of the outer periphery of the said package based on the image of the said silhouette which the said imaging means imaged, receiving the light from the spout illumination means. 5. The inspection device according to 4. The package is transported by predetermined transport means,
The imaging unit is arranged to receive light from the rear illumination unit across a conveyance path of the package by the conveyance unit,
The inspection device according to claim 4, wherein the determination unit determines whether the transport position of the package is appropriate based on the image of the silhouette. The inspection device according to claim 6, wherein the determination unit determines whether the relative position between the package body and the spout is appropriate based on the image of the silhouette. The inspection apparatus according to claim 6, wherein the determination unit determines whether the shape of the opening of the package body is appropriate based on the image of the silhouette. The determining unit specifies an apparent width of the package projected on the imaging unit based on the image of the silhouette, and determines whether the package is twisted based on the specified width. The inspection device according to claim 4 or 6, wherein: A package body, and a package having a spout that is inserted into the opening of the package body and has higher light transmissivity than the package body is imaged by an imaging unit, and based on the imaged image, In an inspection device that inspects a package,
Spout lighting means for irradiating light to the inside of the spout,
Based on an image of the silhouette of the opening captured by the imaging unit by receiving light from the spout illumination unit, a determination unit that determines whether the outer shape of the package body is appropriate or not,
An inspection apparatus comprising: The inspection apparatus according to claim 11, wherein the determination unit determines whether the shape of the opening of the package body is appropriate based on the image of the silhouette.

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