JP2020057308A - Workpiece inspection device - Google Patents

Abstract

To provide a workpiece inspection device capable of automatically switching an inspection method even if there are a workpiece having a code and a workpiece not having a code as types for which inspection is performed.SOLUTION: A processing unit of a workpiece inspection device includes: a camera for imaging a photographing region to obtain an image; a code reading unit 103 for reading a code from the obtained image; a first inspection unit 106 for determining whether a workpiece is good or not on the basis of a read result by the code reading unit 103 by using a code image reflecting a code at the time of inspection; a second inspection unit 107 for determining whether the workpiece is good or not by an inspection method different from the first inspection unit 106 on the basis of the obtained image at the time of inspection; and an inspection switching unit 108 for validating inspection by the first inspection unit 106 if there is an image from which the code is successfully read out among images obtained for one workpiece and validating inspection by the second inspection unit 107 if there is no image from which the code is successfully read out at the time of step change.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a work inspection device for inspecting a work.

  2. Description of the Related Art Conventionally, a work inspection method using a code has been widely used (for example, see Patent Document 1). In this inspection method, a one-dimensional or two-dimensional code (for example, a barcode or a QR code (registered trademark, omitted from the following description)) is provided on a work in advance by printing or pasting a label. Then, the work flowing through the inspection line is imaged by a camera, and a code is read from the image obtained by the camera to inspect the work.

JP 2012-114886 A

  However, if there is a work that does not have a code as well as a work that has a code as a product type to be inspected, the operator manually sets the inspection method and setting during setup change when the product type is changed. You need to switch. In this case, the setup change process often takes a lot of trouble and time.

  The present invention has been made in order to solve the above-described problem, and even when there are a work having a code and a work having no code as a type to be inspected, a work capable of automatically switching an inspection method. It is intended to provide an inspection device.

  A work inspection apparatus according to the present invention includes an imaging unit that captures an image of an imaging region to obtain an image, a code reading unit that reads a code from an image obtained by the imaging unit, and a code that is reflected during inspection. A first inspection unit that uses a code image to determine whether the work is correct based on the result of reading by the code reading unit, and an inspection that differs from the first inspection unit based on an image obtained by the imaging unit during inspection. There is a second inspection unit that determines whether the work is correct or not, and an image that has been successfully read by the code reading unit among the images obtained for one work by the imaging unit during setup change. A test switching unit that validates the inspection by the first inspection unit and validates the inspection by the second inspection unit when there is no image whose code has been successfully read by the code reading unit. .

  According to the present invention, as described above, the inspection method can be automatically switched even when there are a work having a code and a work having no code as a type to be inspected.

FIG. 2 is a diagram illustrating a configuration example of a work inspection device according to the first embodiment. 5 is a diagram illustrating a configuration example of a processing unit according to Embodiment 1. FIG. FIG. 2 is a diagram illustrating a configuration example of a collating machine to which the work inspection device according to the first embodiment is applied; 5 is a diagram illustrating an example of imaging timing of a camera in Embodiment 1. FIG. 5 is a flowchart illustrating an operation example of setup change by a processing unit according to the first embodiment. 5 is a flowchart illustrating an example of an inspection operation by a processing unit according to the first embodiment. 13 is a flowchart illustrating an example of an inspection operation performed by a processing unit according to the second embodiment.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
Embodiment 1 FIG.
FIG. 1 is a diagram illustrating a configuration example of a work inspection device 1 according to the first embodiment.
The work inspection device 1 inspects a work. The work includes a work provided with a code by printing or attaching a label, and a work having no code. Examples of the code type include a one-dimensional barcode, a two-dimensional barcode, a QR code, an SP code, a Vericode, a maxicode, a CP code, a DataMatrix or a chameleon code, and a code reading unit that is a code reader. Anything that can be read by 103 can be used.

The work inspection apparatus 1 includes a camera (imaging unit) 101 and a processing unit 102, as shown in FIG.
The camera 101 images a predetermined imaging region at a predetermined imaging timing. Data indicating an image obtained by the imaging by the camera 101 is output to the processing unit 102.
The processing unit 102 inspects the workpiece based on the image obtained by the camera 101. As shown in FIG. 2, the processing unit 102 includes a code reading unit 103, a code image setting unit 104, a code image registration unit 105, a first inspection unit 106, a second inspection unit 107, and an inspection switching unit 108. . The processing unit 102 is realized by a processing circuit such as a system LSI (Large Scale Integration) or a CPU (Central Processing Unit) that executes a program stored in a memory or the like.

  The code reading unit 103 reads a code from an image obtained by the camera 101.

  When a code is read by the code reading unit 103 at the time of setup change, the code image setting unit 104 sets an image in which the code appears as a code image.

  The code image registration unit 105 registers data indicating the code image set by the code image setting unit 104.

Note that the code image registration unit 105 is configured by a hard disk drive (HDD), a digital versatile disc (DVD), a memory, or the like.
In FIG. 1, the code image registration unit 105 is provided inside the work inspection device 1. However, the present invention is not limited to this, and the code image registration unit 105 may be provided outside the work inspection apparatus 1.

  At the time of inspection, the first inspection unit 106 uses a code image indicated by the data registered in the code image registration unit 105 and determines whether or not the work is correct based on the result of reading by the code reading unit 103. At this time, the first inspection unit 106 determines that if there is an image in which the code read by the code reading unit 103 is the same as the code in the code image among the images obtained for one work by the camera 101, The work is determined to be correct. On the other hand, the first inspection unit 106 determines whether there is no image in which the code read by the code reading unit 103 is the same as the code in the code image among the images obtained for one work by the camera 101, or If there is no image whose code has been successfully read by the code reading unit 103, it is determined that the work is not correct.

  At the time of inspection, the second inspection unit 107 determines whether or not the work is correct based on an image (inspection image) obtained by the camera 101 using an inspection method different from that of the first inspection unit 106. At this time, the second inspection unit 107 determines whether the work is correct using, for example, pattern matching or appearance inspection of an image.

  As an inspection method by the second inspection unit 107, an inspection method using an apparatus used as the code reading unit 103 as an input device can be considered. For example, when the code reading unit 103 uses a laser, scanning of the code by the laser and scanning of the workpiece are performed simultaneously, and the inspection using the code by the first inspection unit 106 and the laser by the second inspection unit 107 are performed. Use with visual inspection. In addition, as an inspection method by the second inspection unit 107, a method of performing image inspection using a line scanner, a charge coupled device (CCD) camera, a complementary metal oxide semiconductor (CMOS) camera, or the like instead of scanning with a laser is also considered. Can be

  The inspection switching unit 108 enables or disables the inspection by the first inspection unit 106 and the inspection by the second inspection unit 107 based on the code reading result by the code reading unit 103 during the setup change. At this time, if there is an image whose code has been successfully read by the code reading unit 103 among the images obtained for one work by the camera 101, the inspection switching unit 108 performs the inspection by the first inspection unit 106. Is valid, and the inspection by the second inspection unit 107 is invalid. On the other hand, if there is no image whose code has been successfully read by the code reading unit 103 among the images obtained for one work by the camera 101, the inspection switching unit 108 performs the inspection by the second inspection unit 107. The inspection by the first inspection unit 106 is invalidated.

  When there are a plurality of types of codes included in the work, the work inspection apparatus 1 can repeat the code reading process at the time of the setup change by the types.

Next, an operation example of the workpiece inspection device 1 according to the first embodiment will be described. Hereinafter, a case where the work inspection apparatus 1 according to the first embodiment is applied to the collating machine 2 shown in FIG. 3 will be described.
The collating machine 2 includes a transport path 201 and a plurality of stockers (pieces) 202, as shown in FIG. The transport path 201 is a conveyor mechanism or the like. The stocker 202 is provided along the transport path 201, and stores the signature 5 (work). In this collating machine 2, the signatures 5 stored in the respective stockers 202 are extracted one by one from the top one, for example, and supplied onto the transport path 201 in accordance with the transport speed of the transport path 201. . Thus, in the collating machine 2, the signatures 5 are sequentially stacked from the upstream side of the transport path 201, and the collating machine 2 finally supplies the signatures 5 to the bookbinding machine.
A camera 101 of the work inspection apparatus 1 is provided above the stocker 202 with respect to the collating machine 2. Then, the processing unit 102 of the work inspection apparatus 1 inspects the signature 5 from the image obtained by the camera 101. In FIG. 3, illustration of the processing unit 102 is omitted. In the following, as shown in FIG. 4, the camera 101 changes the position of the imaging area with respect to one signature 5 according to the transport speed (drawing speed) of the signature 5 extracted from the stocker 202. The operation is controlled so that a plurality of images of a predetermined size are obtained. For example, the camera 101 sets an image area of 4 cm × 4 cm as an image composed of 480 pixels × 480 pixels, and obtains a total of eight (# 1 to # 8) images for one signature 5.

  First, an operation example of the setup change by the processing unit 102 according to the first embodiment will be described with reference to FIG. The camera 101 captures an image of the signature 5 extracted from the stocker 202 by capturing an image of a predetermined imaging region at a predetermined imaging timing. In the above example, the camera 101 obtains a total of eight images (teaching images) for one signature 5 (# 1 to # 8). Data indicating the teaching image obtained by the imaging by the camera 101 is output to the processing unit 102.

  In the operation example of the setup change by the processing unit 102, as shown in FIG. 5, first, the code reading unit 103 reads a code from a teaching image obtained by the camera 101 (step ST501). The size of the code reading area is set in advance.

  Next, code reading section 103 determines whether or not there is an image whose code has been successfully read among the teaching images obtained for one signature 5 by camera 101 (step ST502).

  In step ST502, when the code reading unit 103 determines that there is an image for which the code has been successfully read, the code image setting unit 104 sets an image in which the code is reflected as a code image, and sets the code image registration unit 105 registers data indicating the code image (step ST503).

  Further, inspection switching section 108 enables the inspection by first inspection section 106 and invalidates the inspection by second inspection section 107 (step ST504).

  On the other hand, in step ST502, when the code reading unit 103 determines that there is no image for which the code has been successfully read, the inspection switching unit 108 validates the inspection by the second inspection unit 107 and performs the inspection by the first inspection unit 106. The inspection is invalidated (step ST505).

  As described above, the work inspection apparatus 1 according to the first embodiment automatically switches the inspection method according to the code reading result at the time of setup change, and sets the code image when the code is read. Is performed automatically, the labor and time required for the setup change can be reduced as compared with the related art.

  Next, an example of the inspection operation of the signature 5 by the processing unit 102 according to the first embodiment will be described with reference to FIG. In FIG. 6, it is assumed that the inspection by the first inspection unit 106 is valid in the work inspection apparatus 1. Further, the camera 101 captures an image of a predetermined imaging region at a predetermined imaging timing, and outputs data indicating the obtained image (inspection image) to the processing unit 102. For example, the camera 101 sets a 4 cm × 4 cm imaging area to an image composed of 480 pixels × 480 pixels, and obtains a total of eight inspection images for one signature 5.

  In the inspection operation example of the signature 5 by the processing unit 102, as shown in FIG. 6, first, the code reading unit 103 reads a code from the inspection image obtained by the camera 101 (step ST601).

  Next, first inspection unit 106 determines whether signature 5 is correct based on the result of reading by code reading unit 103 using the code image indicated by the data registered in code image registration unit 105 (step ST602). At this time, the first inspection unit 106 determines, among inspection images obtained by the camera 101 for one signature 5, an image in which the code read by the code reading unit 103 is the same as the code in the code image. In some cases, the signature 5 is determined to be correct. On the other hand, the first inspection unit 106 has no image in which the code read by the code reading unit 103 is the same as the code in the code image among the inspection images obtained for one signature 5 by the camera 101. In this case, or when there is no image whose code has been successfully read by the code reading unit 103, the signature 5 is determined to be incorrect.

  In the above description, the inspection switching unit 108 validates the inspection by the first inspection unit 106 and invalidates the inspection by the second inspection unit 107 when there is an image whose code has been successfully read by the code reading unit 103. However, the present invention is not limited thereto, and the inspection switching unit 108 enables the inspection by the first inspection unit 106 and the inspection by the second inspection unit 107 when there is an image whose code has been successfully read by the code reading unit 103. May also be valid. As described above, the work inspection apparatus 1 according to the first embodiment improves the strictness of the inspection by using the inspection based on the code reading and the inspection based on another inspection method, and reduces the possibility of defective products flowing out. It can be reduced.

  As described above, according to the first embodiment, the work inspection apparatus 1 includes the camera 101 that captures an image of the imaging region and obtains an image, and the code reading unit that reads a code from the image obtained by the camera 101. 103, a first inspection unit 106 that uses a code image in which a code is reflected at the time of inspection, and determines whether or not the work is correct based on the result of reading by the code reading unit 103. A second inspection unit 107 that determines whether the work is correct or not based on the image obtained by the first inspection unit 106 using an inspection method different from that of the first inspection unit 106, and an image obtained for one work by the camera 101 during setup change. Of these, when there is an image whose code has been successfully read by the code reading unit 103, the inspection by the first inspection unit 106 is validated, and the code reading unit 103 If there is no image that has been successfully taken and a test switching unit 108 to enable the inspection by the second inspection unit 107. As a result, the work inspection apparatus 1 according to the first embodiment can automatically switch the inspection method even when there are a work having a code and a work having no code as types to be inspected.

Embodiment 2 FIG.
In the first embodiment, when the inspection by the first inspection unit 106 is valid, the first inspection unit 106 performs the inspection regardless of whether the code reading unit 103 successfully reads the code. . In this case, when reading of the code fails due to reasons such as poor print quality of the code, the product may be determined to be a defective product although it is a good product, and the yield may be deteriorated. Therefore, in a second embodiment, a method for solving the above problem will be described. The configuration example of the work inspection device 1 according to the second embodiment is the same as the configuration example of the work inspection device 1 according to the first embodiment shown in FIGS.

  In addition, in addition to the functions described in the first embodiment, the second inspection unit 107 according to the second embodiment uses the camera 101 to perform one work by the camera 101 when the inspection by the first inspection unit 106 is valid. When there is no image whose code has been successfully read by the code reading unit 103 out of the images obtained for, the work is re-inspected.

  Next, an example of an inspection operation of the signature 5 by the processing unit 102 according to the second embodiment will be described with reference to FIG. In FIG. 7, it is assumed that the inspection by the first inspection unit 106 is effective in the work inspection apparatus 1. Further, the camera 101 captures an image of a predetermined imaging region at a predetermined imaging timing, and outputs data indicating the obtained image (inspection image) to the processing unit 102. For example, the camera 101 sets a 4 cm × 4 cm imaging area to an image composed of 480 pixels × 480 pixels, and obtains a total of eight inspection images for one signature 5.

  In the inspection operation example of the signature 5 by the processing unit 102, as shown in FIG. 6, first, the code reading unit 103 reads a code from the inspection image obtained by the camera 101 (step ST701).

  Next, code reading section 103 determines whether there is an image whose code has been successfully read out of the inspection images obtained for one signature 5 by camera 101 (step ST702).

  In step ST702, if the code reading unit 103 determines that there is an image whose code has been successfully read, the first inspection unit 106 uses the code image indicated by the data registered in the code image registration unit 105, Whether the signature 5 is correct or not is determined based on the result of reading by the code reading unit 103 (step ST703). At this time, if there is an image in which the code is the same as the code in the code image among the images for which the code reading unit 103 has successfully read the code, the first inspection unit 106 determines that the signature 5 is correct. I do. On the other hand, if there is no image in which the code is the same as the code in the code image among the teaching images from which the code reading unit 103 has successfully read the code, the first inspection unit 106 determines that the signature 5 is incorrect. judge.

  On the other hand, in step ST702, when the code reading unit 103 determines that there is no image for which the code has been successfully read, the second inspection unit 107 performs the first inspection unit based on the inspection image obtained by the camera 101. Whether the work is correct or not is determined by an inspection method different from 106 (step ST704).

  As described above, in the state where the inspection by the first inspection unit 106 is enabled, the work inspection apparatus 1 according to the second embodiment, when the reading of the code fails at the time of the inspection, is performed by the second inspection unit. A retest is performed by 107. As a result, in addition to the effects of the first embodiment, the workpiece inspection apparatus 1 according to the second embodiment determines that the code is defective even if the code reading fails due to poor code print quality or the like. Can be suppressed, and the yield can be improved.

  In the first and second embodiments, the case where the camera 101 obtains a plurality of images at different positions of the imaging region for one workpiece has been described. However, the present invention is not limited to this, and the camera 101 may obtain one image of the entire work for one work. Note that the number of images obtained by the camera 101 for one work is appropriately set according to the relationship between the resolution of the camera 101 and the processing time.

  In addition, within the scope of the present invention, the present invention can freely combine any of the embodiments, modify any of the components in each of the embodiments, or omit any of the components in each of the embodiments. is there.

DESCRIPTION OF SYMBOLS 1 Work inspection apparatus 2 Collator 5 Signature 101 Camera (imaging part)
102 processing unit 103 code reading unit 104 code image setting unit 105 code image registration unit 106 first inspection unit 107 second inspection unit 108 inspection switching unit 201 transport path 202 stocker

Claims (5)

An imaging unit that captures an image by capturing an imaging area;
A code reading unit that reads a code from an image obtained by the imaging unit;
At the time of inspection, using a code image in which a code is reflected, a first inspection unit that determines whether or not the work is correct based on a result of reading by the code reading unit;
At the time of inspection, based on an image obtained by the imaging unit, a second inspection unit that determines whether the work is correct or not using an inspection method different from that of the first inspection unit;
At the time of the setup change, among the images obtained for one workpiece by the imaging unit, when there is an image for which the code reading unit has successfully read the code, the inspection by the first inspection unit is validated, An inspection switching unit that validates the inspection by the second inspection unit when there is no image whose code has been successfully read by the code reading unit. The work inspection apparatus according to claim 1, wherein the imaging unit obtains a plurality of images having different positions of an imaging region for one work. At the time of setup change, when a code is read by the code reading unit, a code image setting unit that sets an image in which the code is reflected as a code image,
The work inspection apparatus according to claim 1, wherein the first inspection unit uses a code image set by the code image setting unit at the time of inspection. The inspection switching unit is configured to perform the first inspection when the code reading unit successfully reads a code among images obtained for one workpiece by the imaging unit during the setup change. The work inspection apparatus according to any one of claims 1 to 3, wherein the inspection by the second inspection unit is also effective in addition to the inspection by the unit. In the state where the inspection by the first inspection unit is valid, the second inspection unit may include, among the images obtained for the one workpiece by the imaging unit during the inspection, the code reading unit of the code reading unit. The work inspection apparatus according to any one of claims 1 to 3, wherein when there is no image that has been successfully read, the work is re-inspected.

Images