JP4986255B1 - Container mouth inspection method and apparatus - Google Patents

Abstract

Enables accurate inspection of defects at the beginning of glass bottle screws.
The container mouth is imaged from above the container with a camera, a ring-shaped inspection gate is created on the ring-shaped screw image in the captured image, and the darkness exceeding a predetermined gray level difference in the ring-shaped inspection gate A portion of the ring-shaped inspection gate including the dark portion is searched for and a screw end inspection gate is formed. In the screw end inspection gate, a screw end image that matches the registered image of the screw end that has been registered in advance is searched, and left and right side inspections are performed on a part of the ring-shaped inspection gate on both sides of the pattern matched screw end. Create a gate. In the left and right inspection gates, when a dark part exceeding a predetermined density difference and area is detected, the dark part is determined as a defect.
[Selection] Figure 12

Description

  The present invention relates to a container mouth inspection method and apparatus for inspecting the presence or absence of defects (chips) in the mouth of a container such as a glass bottle, and more particularly to a container inspecting a container being conveyed by a conveyor.

  An apparatus for inspecting a screw of a container being conveyed by a conveyor is disclosed in Patent Document 1 below. This includes a mirror that reflects the light from the outer peripheral surface of the container mouth and a camera that captures the light from the mirror, and an image processing device processes images from the beginning to the end of the screw imaged by the camera. When the pixel in the image has changed from a dark pixel to a bright pixel or from a bright pixel to a dark pixel, the portion of the pixel that has changed from dark to bright or bright to dark is the start of the screw or screw. It is determined as a formed defect (chip).

JP 2010-151473 A

  The above-described conventional apparatus has a problem in that a defect at the start of the screw cannot be found because the portion that has changed from dark to light or from bright to dark is determined as the start or defect of the screw. Moreover, screw defects often occur at the beginning of the screw.

  An object of the present invention is to make it possible to find a defect at the start of a screw in the mouth inspection of a container being conveyed by a conveyor.

(Claim 1)
The present invention includes the step of imaging the container mouth from above the container with a camera;
Creating a ring-shaped inspection gate on a ring-shaped screw image in the captured image;
A step to search for parts component that exceeds a predetermined shading difference in inside of the ring-shaped test gate,
Creating a screw end inspection gate in a partial region of the ring-shaped inspection gate including the crossing portion;
In the screw end inspection gate, searching for a screw end image that matches a registered image of a screw end registered in advance;
Creating left and right inspection gates in a partial region of the ring-shaped inspection gate on both sides of the pattern matched screw ends;
In left and right portions inspection gate, comprising the step of detecting the dark portion exceeding a predetermined area at a predetermined less brightness, determining a dark portion exceeding a predetermined area below the predetermined brightness as defect It is the container mouth part inspection method characterized.

  Most of the chipping of the screw occurs at the screw end (starting portion of the upper end of the screw) and the first thread of the screw. Therefore, the screw defect (chip) can be inspected by an image obtained by imaging the container mouth from above. Since the image taken from above is simple, the inspection accuracy is improved.

  As will be described later, if there is a chip at the screw end, a dark part will occur adjacent to the dark part of the normal screw end image. Can be detected.

(Claim 2)
The present invention further includes a step of creating a divided inspection gate in which the portion other than the screw end inspection gate is divided into a plurality of portions along a radial line, and a predetermined inspection is performed in each divided inspection gate. The container mouth inspection method according to claim 1, further comprising a step of detecting a dark portion that is less than brightness and exceeds a predetermined area, and that a dark portion that is less than the predetermined brightness and exceeds the predetermined area is determined as a defect. It is.

  Thereby, the chip | tip of general parts other than a screw end can be accurately detected in the 1st thread.

(Claim 3)
The present invention further includes a step of creating a divided inspection gate for detecting an outer edge by dividing a ring-shaped region including the ring-shaped inspection gate into a plurality of lines along a radial direction, and each divided inspection gate for detecting an outer edge. And searching for the position of the outer peripheral edge where the brightness is equal to or greater than a predetermined brightness, and the difference between the distance from the outer peripheral edge position of the adjacent peripheral edge detection division inspection gate to the center is predetermined. The container mouth inspection method according to claim 1, wherein it is determined that there is a defect when the threshold value is exceeded.

  Thereby, the chip | tip of a screw outer peripheral part can be accurately detected in the 1st thread | sled.

(Claim 4 )
The present invention also provides illumination for illuminating the container mouth,
A camera that images the container mouth from above;
Create a ring-shaped test gates on the ring-shaped thread image in the mouth image captured by the camera, looking for a part component that exceeds a predetermined shading difference in inside of the ring-shaped test gate, the exceeding portion An inspection gate for creating a screw end inspection gate in a partial region of the ring-shaped inspection gate including the image and searching for a screw end image that matches a registered image of the screw end registered in advance in the screw end inspection gate Detection means;
Left and right inspection gates are created in a part of the ring inspection gate on both sides of the pattern matched screw ends, and dark portions exceeding a predetermined area with a predetermined brightness or less in the left and right inspection gates. It is a container mouth inspection device characterized by having a screw end left and right part chipping detection means for detecting and determining as a defect a dark portion which is equal to or less than the predetermined brightness and exceeds a predetermined area.

  Since the apparatus of the present invention performs the inspection in the inspection direction of claim 1, it is possible to accurately detect the chipping of the screw end.

(Claim 5 )
Further, the present invention further creates a divided inspection gate in which a portion other than the screw end inspection gate, which is the ring-shaped inspection gate, is divided into a plurality of radial lines, and each divided inspection gate has a predetermined brightness. detecting the dark portion exceeding a predetermined area below the container opening the inspection according to claim 4 having a screw general portion missing detecting means for determining the dark portion exceeding a predetermined area below the predetermined brightness as defect Device.

  Since this invention apparatus test | inspects in the test | inspection direction of Claim 2, it can detect accurately the chip | tip of general parts other than a screw end in the 1st thread | thread.

(Claim 7)
Further, the present invention further creates a divided inspection gate for detecting an outer edge by dividing a ring-shaped region including the ring-shaped inspection gate into a plurality of lines along a radial direction, and the divided inspection gate for detecting the outer edge is formed from the outside. When searching the inside to detect the position of the outer edge where the brightness is equal to or greater than the predetermined brightness, the difference in the distance from the outer edge to the center of the adjacent outer edge detection division inspection gate exceeds a predetermined threshold The container opening inspection device according to claim 5, further comprising a screw outer peripheral chip detection unit that determines that there is a defect.

  Since this invention apparatus test | inspects in the test | inspection direction of Claim 3, the chip | tip of a screw outer peripheral part can be detected with a sufficient precision in the 1st thread | thread.

(Claim 7 )
Moreover, this invention is a container opening | mouth inspection apparatus of Claim 4 with which the said illumination and a camera are provided on the conveyance means of a container, and a camera images the container currently conveyed by the conveyance means.

  The device of the present invention can accurately inspect the mouth of a container being conveyed by a conveyor or the like.

  In the mouth inspection method and apparatus of the present invention, since a screw defect (chip) inspection is performed with a simple image obtained by imaging the container mouth from above, the inspection can be performed with high accuracy. Further, by performing the density inspection at the left and right inspection gates, it is possible to detect the chipping of the screw end with high accuracy.

It is a block diagram of container mouth part inspection device 1 of an example. It is explanatory drawing of embodiment of this invention. It is sectional drawing of dome illumination. 3 is a flowchart of the container mouth portion inspection apparatus 1. It is the side view and captured image schematic diagram of a container mouth part without a defect. It is the side view and captured image schematic diagram of a container opening part with a defect. It is a flowchart of inspection gate creation. It is explanatory drawing of outer periphery edge detection. It is explanatory drawing of inner periphery circular edge detection. It is explanatory drawing of ring-shaped inspection gate 22 preparation. It is a flowchart of screw end right and left part chipping detection. It is explanatory drawing of a screw end right-and-left part chipping detection. It is a flowchart of a screw general part chip | tip detection. It is explanatory drawing of a screw general part chip | tip detection. It is a flowchart of a screw outer peripheral part chip | tip detection. It is explanatory drawing of screw outer peripheral part chip | tip detection. It is a flowchart of a top surface part chip | tip detection. It is explanatory drawing of a top surface part chip | tip detection.

  As shown in FIG. 1, the container mouth inspection device 1 of the embodiment includes a camera 11, an illumination 12, a memory 10 a, an inspection gate detection unit 2, a screw end left and right part chipping detection unit 3, a screw general part chipping detection unit 4, The screw outer peripheral portion chipping detection means 5 and the top surface portion chipping detection means 6 are provided. The inspection gate detection means 2 includes a ring-shaped inspection gate detection means 2a and a screw end position detection means 2b. Light from the illumination 12 is reflected by the top surface of the container mouth, a screw, and the like, and the reflected light is imaged by the camera 11. The captured image is stored in the memory 10a. The image data read from the memory 10a is subjected to creation of a ring-shaped inspection gate and detection of the screw end position by the inspection gate detection means 2. Further, the image data is sent to the screw end left and right part chipping detection means 3, the screw general part chipping detection means 4, the screw outer peripheral part chipping detection means 5, and the top surface chipping detection means 6 for each inspection. If each detection means determines that the failure is detected, a failure signal is output. In addition to being recorded in the memory, the failure signal can be used for the operation of a warning device, the operation of a defective container removal device, and the like.

  For example, a commercially available high-speed area sensor camera can be used as the camera 11. The illumination may be anything as long as it can irradiate light evenly on the container mouth portion. For example, red LED dome illumination is very suitable. FIG. 3 is a cross-sectional view of the red dome illumination. A hole 12b is formed at the top of the dome-shaped reflector, and a plurality of red LEDs 12a are provided at the lower end of the inner periphery. The red light of the red LED 12a is reflected by the dome-shaped reflector and irradiated downward.

  As the memory 10a, a memory attached to or connected to a personal computer (PC) can be used. The inspection gate detection means 2, the screw end left and right part chipping detection means 3, the screw general part chipping detection means 4, the screw outer peripheral part chipping detection means 5, and the top surface chipping detection means 6 are in a PC or an I / O circuit connected thereto. Operated by software.

  As shown in FIG. 2, the mouth inspection of the present invention can be performed on a container being conveyed by a conveyor. The container 7 is conveyed on the conveyor 14 in the arrow direction (right direction). It is desirable that the transport surface of the conveyor 14 be colored black in order to maintain inspection accuracy. The conveyor 14 is provided with an encoder 14a that generates a pulse each time the transport surface moves a predetermined distance. An illumination 12 (dome illumination) is fixed above the conveyor 14, and a camera 11 is fixed above it. In addition, a timing sensor 15 is provided for detecting the container that has come directly under the camera. Reference numeral 10 denotes a PC, which is provided with a memory 10a, an inspection gate detection means 2, a screw end left / right part chipping detection means 3, a screw general part chipping detection means 4, a screw outer periphery chipping detection means 5, and a top surface chipping detection means 6. ing. Reference numeral 13 denotes an exclusion control unit.

  When the container 7 comes directly below the camera 11, the timing sensor 15 detects it, and a timing signal is sent to the PC via the exclusion control unit 13, and the shutter of the camera 11 is released. The captured image is sent to a PC for various inspections. When it is determined as defective in the inspection, a defect signal is sent from the PC to the rejection control unit 13, and the rejection control unit 13 reaches the front of the air nozzle 13a from the timing signal of the timing sensor 15 and the pulse signal of the encoder 14a. The air nozzle 13a is actuated at the timing, and the defective container is blown away and removed from the conveyor 14.

Next, the outline of the processing in the container mouth inspection apparatus 1 will be described with reference to FIG.
Step 101 ... Is the data processing command ON?
Is determined first, and if it is YES,
Step 102: Proceed to data processing (detection of defect), the inspection gate detection means 2 creates a ring-shaped inspection gate and detects the screw end position, and the screw end right and left chipping detection means 3, the screw general part The inspection is performed by the chip detection means 4, the screw outer periphery chip detection means 5, and the top surface chip detection means 6. After this,
Step 103 ... Is it defective?
If YES, the process proceeds to Step 104... Recording a defect, the defect information is recorded in the memory of the PC, and the process proceeds to Step 105. If NO, the process proceeds to step 105 as it is.
Step 105: Returning to the step 101 from the next data processing command, the above processing (steps 101 to 105) is repeated for the next line data.

  FIG. 5 is a schematic diagram of a mouth image taken with a camera in the upper part and a side view in the upper part of the mouth part without defects of the container 7. In the upper side view, reference numeral 70 denotes a screw, 71 denotes a screw end, and 75 denotes a top surface. In the lower mouth image, the first screw image 70a is a bright ring, the top image 75a is a slightly dark ring inside, and the outside of the screw image 70a and the inside of the top image 75a are dark. . In the bright screw image 70a, the screw end image 71a is dark.

  FIG. 6 is a schematic diagram of a mouth image of the mouth part having a defect in the container 7, which is a side view in the upper stage and a camera imaged in the lower stage. In the upper side view, the chip 72 is a chip at the screw end, the chip 73 is a chip at the general part of the screw, the chip 74 is a chip at the outer periphery of the screw, and the chip 76 is a chip at the top surface. In the lower mouth image, when there is a chip at the screw end, a dark chipped image 72a and a chipped image 72b appear adjacent to each other. The chipped image 73a of the general screw portion appears dark in the ring of the screw image 70a. The chipped image 74a at the outer periphery of the screw appears dark on the outer periphery of the screw image 70a. The chipped image 76a on the top surface appears dark in the ring-shaped top surface image 75a.

(Inspection gate creation)
Next, the creation of the inspection gate will be described with reference to FIGS.
Step 201: By setting the outer circumference circle range in the screw image portion, the outer circumference circle range 20 between the inner and outer circles indicated by the thick chain line in the upper part of FIG. 8 is set in the mouth image. The center coordinates and radius of these two chain circles are set in advance. The inspection line is automatically drawn radially from the center of the inner and outer two circles, and the upper edge of the inspection line is detected between the inner and outer two circles. A point where the density rapidly changes from light to dark and from dark to light is detected as an edge. When the edge inspection is performed from the outer circle toward the inner circle under the condition that changes from dark to bright and the largest circle is detected, the outer periphery of the screw part is detected as an edge, and the detected point on the outer periphery of the screw part is detected. An approximate circle is drawn. Then, as shown in the lower part of FIG. 8, the circle detected by the approximation substantially coincides with the outer periphery of the screw image 70a, and the outer peripheral circle edge 20a is formed.
Step 202 .. Could the outer peripheral circle edge of the screw image be detected and the center position calculated?
Thus, as shown in the lower part of FIG. 8, it is determined whether the outer circumferential edge 20a has been formed and the center position O1 has been calculated. If NO, a failure signal is output as NG, and if YES, step 203... Starting from the center position of the outer circle edge, a process for setting the inner circle range in the screw image portion is performed. This sets an inner circumferential circle range 21 between two inner and outer circles indicated by a thick chain line in the upper part of FIG. The center of these two chain line circles is the center O1 of the outer peripheral circle edge 20a, and the radius is preset. Thereafter, the inspection line is automatically drawn radially from the center of the inner and outer two circles, and the upper edge of the inspection line is detected between the inner and outer two circles. When the edge inspection is performed from the inner circle to the outer circle under the condition of detecting the largest circle that changes from dark to light, as shown in the lower part of FIG. 9, the smaller chain line circle shows the screw image 70a. Substantially coincides with the inner circumference of the inner circumference, and an inner circumference circular edge 21a is formed. Thereby, the position (coordinates) on the imaging screen of the screw image 70a is determined.
Step 204 .. Could the inner circumferential edge of the screw image be detected and the center position calculated?
As shown in the lower part of FIG. 9, it is determined whether the inner circumferential edge 21a is formed and the center position O2 is calculated. If NO, a failure signal is output as NG, and if YES, the process goes to step 205. move on.
Steps 201 to 204 are processed in the ring-shaped inspection gate detection means 2a, and the subsequent steps 205 to 209 are processed in the screw end position detection means 2b.
Step 205... A process of setting a ring-shaped inspection gate in the screw image is performed to detect the screw end. FIG. 10 shows an example of the ring-shaped inspection gate 22. As described above, the ring-shaped inspection gate 22 is desirably set to be outside by several pixels (for example, two to three pixels) from the inner peripheral circular edge 21a so as to be aligned with the outer peripheral circular edge 20a.
Step 206 .. Did a dark part with a density difference greater than a predetermined value be detected?
Then, as shown by an arrow in FIG. 10, the difference in density is performed in the ring-shaped inspection gate 22 along the circumferential direction, and a pair of edges from light to dark and edges from dark to light is searched. The larger the density difference is and the closer the pair interval is to the setting, the more the screw end is detected. The pair interval is determined in advance.
In step 207..., The screw end inspection gate is set in the detected portion. As shown in FIG. 12, the screw end inspection gate 23 is set so as to include the detected dark portion. The size of the screw end inspection gate is determined in advance. afterwards,
Step 208: The position of the screw end is detected by pattern matching with the registered image in the screw end inspection gate. Reference numeral 77 in FIG. 12 denotes a registered typical screw end image, and pattern matching between this and the image in the screw end inspection gate 23 is performed. The pattern match ratio is determined in advance. afterwards,
Step 209. Is there a screw end image exceeding the set pattern match ratio?
In the case of matching, it is determined that the image is a screw end, the process proceeds to the screw end left and right part chipping detection means 3, and if only an image that does not exceed the pattern match ratio is found, a failure signal is indicated as NG. Is issued.

(Detection of left and right part of screw end detection)
Next, the detection of the chipped left and right part chipping will be described with reference to FIGS.
Step 301... The left and right inspection gates 24 are set adjacent to the left and right sides of the screw ends detected by pattern matching by setting the left and right inspection gates on the left and right sides of the screw ends. The size of the left and right inspection gates 24 is determined in advance. afterwards,
Step 302... The threshold value in detecting the left and right part missing of the screw end is set by setting the brightness / area threshold value of the left and right part inspection gates. Specifically, the brightness threshold detects pixels that are darker than the set threshold, and the area threshold is the threshold for the number of pixels in the cluster that are darker than the brightness threshold. . After that, step 303... Is there a pixel darker than the brightness threshold value in the left and right side inspection gates?
From each of the left and right inspection gates, it is determined whether or not there is a pixel equal to or lower than the brightness threshold value. If NO, it is determined that the product is non-defective (no missing left and right parts of the screw end). If YES,
Step 304: Is there an image that exceeds the area threshold at the left and right inspection gates?
To determine whether the number of pixels in the cluster that are below the brightness threshold exceeds the area threshold. If NO, it is determined that the product is non-defective (no missing left and right parts of the screw end). If YES Is determined to have chipping (defects) on the left and right sides of the screw end.

  FIG. 12 shows an example in which the screw ends are missing, and the missing images 72 a and 72 b are dark in the ring-shaped inspection gate 22. Since the missing image 72a resembles the shape of the registered image 77, the pattern matches. However, since the left and right inspection gates 24 are set and inspected adjacent thereto, it is determined that there is a defect by detecting the missing image 72b. Is done. In the present invention, the chipping of the screw end is thus detected.

(Detection of chipping in general screw parts)
Next, the general screw part detection will be described with reference to FIGS.
Step 401... By setting a divided inspection gate obtained by dividing the ring-shaped inspection gate by a radial line, as shown in FIG. 14, the ring-shaped inspection gate 22 other than the screw end inspection gate 23 (pattern-matched) The divided inspection gate 25 is created by dividing the portion of the portion into a plurality of lines along the radial direction. The split inspection gate excludes the screw end inspection gate portion. afterwards,
Step 402... The threshold value for detecting a general screw chipping is set by setting the brightness / area threshold value of the divided inspection gate. Specifically, the brightness threshold detects pixels that are darker than the set threshold, and the area threshold is the threshold for the number of pixels in the cluster that are darker than the brightness threshold. . After that, in step 403..., Is there a pixel that is darker than the brightness threshold in the divided inspection gate?
From each of the divided inspection gates, it is determined whether or not there is a pixel that is equal to or less than the brightness threshold value. If NO, it is determined that the product is non-defective (no missing general screw portion). If YES,
Step 4 04 ...... Is there an image that exceeds the area threshold at the division inspection gate?
To determine whether or not the number of pixels of the cluster that are below the brightness threshold exceeds the area threshold. If NO, it is determined that the product is non-defective (no missing general screw portion). If YES, It is determined that there is a chipping (defect) in the general screw portion.

  FIG. 14 shows an example in which there is a chipped image 73a due to the chipped portion 73 of the general screw portion. Since the chipped image 73a is darker than the other parts of the divided inspection gate, there is a chipped (defect) in the general screw portion. Determined.

(Screw outer periphery detection)
Next, detection of the outer periphery of the screw will be described with reference to FIGS.
Step 501... The peripheral edge detection divided inspection gate 26 is set in the mouth image by setting the peripheral edge detection divided inspection gate obtained by dividing the ring-shaped region including the ring-shaped inspection gate by the radial line. As shown in FIG. 16, the ring-shaped region at this time desirably has the screw outer peripheral edge 20a in the middle. The peripheral edge detection division inspection gate 26 excludes the screw end inspection gate 23 (pattern matched) portion.
Step 502... Setting the sensitivity for detecting the peripheral edge by the peripheral edge detection divided inspection gate As shown by the thick arrow in the lower part of FIG. 16, the peripheral edge detection divided inspection gate is searched from the outside to the inside. Detects the position of the outer edge that exceeds the set brightness. Depending on the sensitivity setting, it is possible to set whether to detect an edge having a high density difference or an edge having a low density difference.
Step 503: By setting a threshold value of the peripheral edge difference between adjacent peripheral edge detection divided inspection gates, the distance from the peripheral edge position detected for each peripheral edge detection inspection gate to the center coordinate is calculated ( FIG. 16 (lower dotted arrow). The unevenness on the outer periphery is calculated by calculating the difference in distance calculated between adjacent gates over the entire outer periphery. Set the threshold value for the difference. afterwards,
Step 504... Does any image exceed the outer edge difference threshold value?
As shown by arrows in the lower part of FIG. 16, each outer edge detection division inspection gate scans from the outer side to the inner side, calculates the distance from the detected edge position to the center coordinate, and each adjacent outer edge The difference is determined for each detection division inspection gate, and it is determined whether there is any that exceeds the threshold value. If NO, it is determined that the product is non-defective (no chipping on the outer periphery of the screw). If YES, the outer periphery of the screw is determined. It is determined that there is a chipping (defect).

  The lower part of FIG. 16 shows a case where there is a chipped image 74a due to a chip 74 at the outer periphery of the screw, and the lengths from the edge to the center detected by the divided inspection gate for detecting the outer peripheral edge of the part are adjacent to each other. Shorter than that, and chipping of the outer periphery of the screw is detected.

(Top face detection)
Next, detection of the outer periphery of the screw will be described with reference to FIGS.
Step 601: A ring-shaped top surface inspection gate is formed on the ring-shaped top surface image 75a in the mouth image by the processing of setting a top surface division inspection gate obtained by dividing the top surface portion by a radial line. 27 is set. There are various methods for setting the top surface inspection gate 27. For example, a circle whose radius is several pixels smaller than the inner circumferential edge 21a is set as the outer periphery of the top surface inspection gate, and a circle whose radius is appropriately smaller than the number of pixels is set as the inner periphery. There is a method. Further, the top surface inspection gate 27 is divided by a line in the radial direction, and a top surface division inspection gate 27a is set as shown in FIG. afterwards,
Step 602... The threshold value for detecting the top surface defect is set by setting the brightness / area threshold value of the top surface division inspection gate. Brightness threshold, specifically detects the dark pixels or bright pixels than the threshold value set, the area threshold of mass has become a dark pixels or bright pixels than the brightness threshold This is the pixel number threshold. afterwards,
Step 603: Is there any image that exceeds the brightness threshold at the top division inspection gate?
From each of the top surface division inspection gates, it is determined whether or not there is a pixel that exceeds the brightness threshold value. If NO, it is determined that the pixel is non-defective (no chip on the top surface). If YES,
Step 604: Is there an image that exceeds the area threshold at the top division inspection gate?
To determine whether the number of pixels that exceed the brightness threshold exceeds the area threshold. If NO, it is determined that the product is non-defective (no chip on the top), and if YES, the top is missing. It is determined that there is a (defect).

  FIG. 18 shows an example in which there is a chipped image 76a due to the top surface chipping 76. Since the chipped image 76a is darker and brighter than the other parts of the top surface division inspection gate, there is a top surface chipping (defect). It is determined.

  It is determined as NG by the inspection gate detection means 2 or any one of the detection means of the screw end left and right part chipping detection means 3, the screw general part chipping detection means 4, the screw outer periphery chipping detection means 5 and the top surface chipping detection means 6. The container determined to have a defect is eliminated by the air nozzle 13a in FIG.

DESCRIPTION OF SYMBOLS 1 Mouth inspection apparatus 10 Personal computer 10a Memory 11 Camera 12 Dome illumination 13 Exclusion control part 13a Air nozzle 14 Conveyor 14a Encoder 15 Timing sensor 2 Inspection gate detection means 2a Ring-shaped inspection gate detection means 2b Screw end position detection means 20 Outer circumference circle range 20a Peripheral circle edge 21 Inner circle range 21a Inner circle edge 22 Ring-shaped inspection gate 23 Screw end inspection gate 24 Left and right part inspection gate 25 Divided inspection gate 26 Divided gate for outer periphery edge detection 27 Top surface inspection gate 27a Top surface division inspection Gate 3 Screw end left / right chipping detection means 4 Screw general section chipping detection means 5 Screw outer periphery chipping detection means 6 Top surface chipping detection means 7 Glass bottle 70 Screw 70a Screw image 71 Screw end 71a Screw end image 72 Chipping 72a Chipping image 7 2b chipped image 73 chipped 73a chipped image 74 chipped 74a chipped image 75 top surface 75a top surface image 76 chipped 76a chipped image 77 registered image

Claims (7)

Imaging the container mouth from above the container with a camera;
Creating a ring-shaped inspection gate on a ring-shaped screw image in the captured image;
A step to search for parts component that exceeds a predetermined shading difference in inside of the ring-shaped test gate,
Creating a screw end inspection gate in a partial region of the ring-shaped inspection gate including the crossing portion;
In the screw end inspection gate, searching for a screw end image that matches a registered image of a screw end registered in advance;
Creating left and right inspection gates in a partial region of the ring-shaped inspection gate on both sides of the pattern matched screw ends;
In left and right portions inspection gate, comprising the step of detecting the dark portion exceeding a predetermined area at a predetermined less brightness, determining a dark portion exceeding a predetermined area below the predetermined brightness as defect A method for inspecting a container mouth. Furthermore, creating a split inspection gates said a ring-shaped test gate is divided into a plurality of portions other than the threaded end inspection gates in radial lines, given in respective divided inspection gate at a predetermined less brightness 2. The container mouth inspection method according to claim 1, further comprising a step of detecting a dark portion exceeding an area of the second portion , and determining a dark portion that is equal to or less than the predetermined brightness and exceeds the predetermined and area as a defect. Further, a step of creating a divided inspection gate for detecting the peripheral edge by dividing the ring-shaped region including the ring-shaped inspection gate into a plurality of lines along a radial direction, and each of the divided inspection gates for detecting the peripheral edge from the outside to the inside A step of searching and detecting a position of an outer peripheral edge that is equal to or greater than a predetermined brightness, and a difference in distance from the outer peripheral edge position of the adjacent peripheral edge detection division inspection gate to the center exceeds a predetermined threshold value The container mouth inspection method according to claim 1, wherein it is determined that there is a defect. Lighting to illuminate the container mouth,
A camera that images the container mouth from above;
Create a ring-shaped test gates on the ring-shaped thread image in the mouth image captured by the camera, looking for a part component that exceeds a predetermined shading difference in inside of the ring-shaped test gate, the exceeding portion An inspection gate for creating a screw end inspection gate in a partial region of the ring-shaped inspection gate including the image and searching for a screw end image that matches a registered image of the screw end registered in advance in the screw end inspection gate Detection means;
Left and right inspection gates are created in a part of the ring inspection gate on both sides of the pattern matched screw ends, and dark portions exceeding a predetermined area with a predetermined brightness or less in the left and right inspection gates. A container mouth inspection device comprising: screw end right and left chipping detection means for detecting and determining, as a defect, a dark portion having a predetermined brightness or less and exceeding a predetermined area as a defect. Further, a divided inspection gate is formed by dividing the ring-shaped inspection gate other than the screw end inspection gate into a plurality of radial lines, and each divided inspection gate has a predetermined area with a predetermined brightness or less. 5. The container mouth part inspection device according to claim 4 , further comprising: a screw general part chipping detection unit that detects a dark part that exceeds the predetermined brightness and determines a dark part that is less than or equal to the predetermined brightness and exceeds a predetermined area as a defect. Further, a divided inspection gate for detecting an outer edge is formed by dividing a ring-shaped region including the ring-shaped inspection gate into a plurality of radial lines, and the divided inspection gate for detecting the outer edge is searched from outside to inside. Detect the position of the outer edge where the brightness is more than the predetermined brightness, and determine that there is a defect when the difference in the distance from the outer edge to the center of the adjacent inspection edge for detecting the outer edge exceeds a predetermined threshold The container mouth inspection device according to claim 4 , further comprising a screw outer peripheral chip detection unit. The container mouth inspection device according to claim 4 , wherein the illumination and the camera are provided on a container transport unit, and the camera images the container transported by the transport unit.

Images