KR20140031392A - Container mouth portion inspection method and device - Google Patents

Abstract

Ensure that the defects in the tip of the screw of the vial are correctly examined. Imaging the container spout from the upper side of the container with a camera, creating a ring-shaped inspection gate on the ring-shaped screw image in the captured image, and finding a dark portion exceeding a predetermined shade in this ring-shaped inspection gate. A screw tip inspection gate is created in a region of a part of the ring-shaped inspection gate including the dark portion. Within this screw tip inspection gate, a screw tip image that matches the registered image of the pre-registered screw tip in pattern is searched for, and the left and right inspection gates are placed in a part of the ring-shaped inspection gate on both sides of the pattern matched screw tip. Write. In this left and right part inspection gate, when the dark part which exceeds predetermined | prescribed light difference and area is detected, this dark part is determined as a defect.

Description

Container spout inspection method and apparatus {CONTAINER MOUTH PORTION INSPECTION METHOD AND DEVICE}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a container spout inspection method and apparatus for inspecting the presence or absence of defects (breaks) on the screw and the top surface of a spout portion of a container such as a glass bottle, and more particularly, to a container that can be transported to a conveyor.

An apparatus for inspecting a screw of a container being conveyed to a conveyor is disclosed in Patent Document 1 below. It is equipped with the mirror which reflects the light from the outer peripheral surface of a container spout part, and the camera which picks up the light from a mirror, The image processing apparatus processes the image projected from the beginning to the end of the screw which imaged with the camera, Where the pixel from the dark pixel to the bright pixel or the bright pixel to the dark pixel is found, and the part of the pixel changed from dark to light or light to dark is formed at the beginning of the screw or on the screw. It is judged as a defect (brokenness).

Japanese Patent Application Laid-Open No. 2010-151473

(Initiation of invention)

(Problems to be Solved by the Invention)

Since the conventional apparatus is to judge the part changed from dark to bright or light to dark as the beginning or defect of the screw, there is a problem that the defect of the beginning of the screw cannot be found. In addition, a screw defect often occurs at the beginning of the screw.

This invention makes it a subject to make it possible to detect the defect of the beginning of a screw in the spout inspection of the container conveyed by a conveyor.

(Claim 1)

The present invention comprises the steps of imaging the container spout with a camera from above the container,

Creating a ring-shaped inspection gate on the ring-shaped screw image in the captured image,

A step of finding a dark portion exceeding a predetermined shade of difference in the ring shape inspection gate;

Creating a screw tip inspection gate in a region of a part of the ring-shaped inspection gate including the dark portion;

A step of finding a screw tip image that matches the registered image of the screw tip registered in advance in this screw tip inspection gate;

Creating left and right inspection gates in a region of a part of the ring-shaped inspection gate on both sides of the pattern-matched screw tips;

A container spout which has a step of detecting a dark portion exceeding a predetermined light shade and an area within this left and right inspection gate, and determining the dark portion exceeding the predetermined dark difference and an area as a defect. It is a test method.

Since the crack of a screw mostly occurs in a screw tip (cutting | disconnection start part of a screw top end) and a 1st line of a screw, a defect (break) test of a screw can be performed by the image which imaged the container spout part from the above. Since the image picked up above is simple, the inspection accuracy is improved.

As will be described later, if there is a crack in the screw tip, a dark portion is generated adjacent to the dark portion of the image of the normal screw tip, so that the crack of the screw tip can be detected by inspecting the light and shade at the left and right inspection gates. .

(Claim 2)

The present invention further provides a step of creating a divided inspection gate in which a portion other than the screw tip inspection gate is divided into a plurality of radial lines as the ring-shaped inspection gate, and a predetermined shade difference in each of the divided inspection gates. And it has the step of detecting the dark part exceeding an area, It is the container spout test method of Claim 1 which determines the said dark part exceeding the said predetermined | prescribed light difference and area as a defect.

Thereby, the crack of the general part other than a screw tip can be detected correctly in the 1st line of a screw.

(Claim 3)

The present invention further provides a step of creating a split inspection gate for outer edge detection in which a plurality of ring-shaped regions including the ring-shaped inspection gate are divided into radial lines in a plurality, and the split inspection for each outer edge detection. A step of searching the gate from the outside to the inside and detecting the position of the outer edge which is equal to or greater than a predetermined brightness, and the difference between the distance from the outer edge position of the divided inspection gate for neighboring outer edge detection to the center has a predetermined threshold value. It is a container spout test method of Claim 1 which judges that there is a defect when it exceeds.

Thereby, the crack of a screw outer peripheral part can be detected correctly in a screw first line.

(Claim 4)

The present invention further provides a ring-shaped top inspection gate on an image of the top of the ring-shaped spout in the picked-up image, and a top-level split inspection gate in which the top surface inspection gate is divided into a plurality of radial lines. And a step of detecting a dark portion or a bright portion exceeding a predetermined shade and difference in each of the top surface divided inspection gates, and the dark portion or a bright portion exceeding the predetermined shade and difference as areas as a defect. It is a container spout test method of Claim 1 to determine.

Thereby, the crack of the upper surface of a snout part can be detected correctly.

(Claim 5)

In another aspect, the present invention provides a light to illuminate the container spout,

A camera for capturing the container spout from above;

The ring-shaped inspection gate is created on the ring-shaped screw image in the spout portion image captured by the camera, the dark portion exceeding a predetermined shade is found in the ring-shaped inspection gate, and the ring including the dark portion Inspection gate detection means for creating a screw tip inspection gate in a portion of the shape inspection gate and finding a screw tip image that matches the registered image of the screw tip registered in advance in the screw inspection gate;

Left and right inspection gates are created in regions of a part of the ring-shaped inspection gates on both sides of the pattern-matched screw tips, and dark areas exceeding a predetermined shade and area are detected in the left and right inspection gates. It is a container spout test | inspection apparatus characterized by having the screw tip left-right part crack detection means which determines the dark part which exceeds the said predetermined | prescribed light difference and area as a defect.

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

(Claim 6)

In addition, the present invention further provides a divided inspection gate which is a ring inspection gate and divides a portion other than the screw tip inspection gate into a plurality of radial lines. It is a container spout test | inspection apparatus of Claim 5 which has a screw general part crack detection means which detects the dark part exceeding and determines the dark part exceeding the said predetermined | prescribed light difference and area as a defect.

Since the apparatus of the present invention performs the inspection in the inspection direction of claim 2, it is possible to accurately detect the crack of the general portion other than the screw tip at the first line of the screw.

(Claim 7)

Moreover, this invention also creates the division inspection gate for outer edge detection which divided the ring-shaped area | region containing the said ring-shaped inspection gate into the radial line in multiple numbers, and this division inspection gate for edge detection is outer side Detect the position of the outer edge which is searched inward from the inner side to be equal to or greater than the predetermined brightness, and is defective when the difference from the outer edge position of the divided inspection gate for neighboring outer edge detection to the center exceeds a predetermined threshold. It is a container spout test | inspection apparatus of Claim 5 which has a screw outer periphery crack detection means to determine.

Since the apparatus of the present invention performs the inspection in the inspection direction of claim 3, the first row of the screws can accurately detect the breakage of the outer periphery of the screws.

(Claim 8)

In addition, the present invention further creates a ring-shaped top inspection gate on an image of the top of the ring-shaped spout in the captured image, and creates a top split inspection gate in which the top inspection gate is divided into a plurality of radial lines. And detecting a dark portion or a bright portion exceeding a predetermined shade and difference within this top-level split inspection gate, and determining a dark portion or bright portion exceeding the predetermined shade and difference as a defect as a defect. It is a container spout test apparatus of Claim 5 which has a means.

Since the apparatus of the present invention performs the inspection in the inspection direction of claim 4, it is possible to accurately detect the crack of the top of the spout.

(Claim 9)

Moreover, this invention is the container spout test apparatus of Claim 5 which image | photographs the container in which the said illumination and a camera are installed on the conveyance means of a container, and a camera is conveyed by a conveyance means.

The apparatus of the present invention can accurately perform spout inspection of a container being conveyed to a conveyor or the like.

Since the spout part inspection method and apparatus of this invention test a defect (brokenness) of a screw with the simple image which image | photographed the container spout part, it can test | inspect correctly. In addition, by inspecting the light and shade in the left and right inspection gates, cracking of the screw tip can be detected with high accuracy.

1 is a block diagram of the container spout inspection device 1 of the embodiment.
2 is an explanatory diagram of an embodiment of the present invention.
3 is a cross-sectional view of the dome illumination.
4 is a flowchart of the container spout inspection device 1.
5 is a side view and a captured image schematic view of a container spout without a defect.
6 is a side view and a captured image schematic view of a defective container spout.
7 is a flowchart of inspection gate creation.
8 is an explanatory diagram of outer circumferential edge detection.
9 is an explanatory diagram of inner circumference edge detection.
10 is an explanatory diagram for preparing the ring shape inspection gate 22.
11 is a flowchart of screw tip left and right crack detection.
12 is an explanatory diagram of screw tip left and right crack detection.
Fig. 13 is a flowchart of thread general part break detection.
It is explanatory drawing of the thread normal part crack detection.
15 is a flowchart of screw outer circumference crack detection.
It is explanatory drawing of the screw outer periphery crack detection.
17 is a flowchart of top surface crack detection.
18 is an explanatory diagram of top surface crack detection.

(Mode for carrying out the invention)

As shown in Fig. 1, the container spout inspection device 1 of the embodiment includes a camera 11, an illumination 12, a memory 10a, an inspection gate detection means 2, and screw tip left and right crack detection means ( 3) The screw general part crack detection means 4, the screw outer peripheral part crack detection means 5, and the top surface part crack detection means 6 are provided. The inspection gate detecting means 2 consists of a ring shaped inspection gate detecting means 2a and a screw tip position detecting means 2b. The light from the illumination 12 is reflected by the container spout top, a screw, etc., and the reflected light is imaged with the camera 11. The captured image is stored in the memory 10a. In the image data read out from the memory 10a, the inspection gate detecting means 2 creates a ring-shaped inspection gate and detects a screw tip position. Further, the image data is sent to the screw tip left and right crack detection means 3, the screw general part crack detection means 4, the screw outer peripheral crack detection means 5, and the top surface crack detection means 6, and each inspection is performed. All. In the case where it is determined that the detection means is defective, the failure signal is output. In addition to being recorded in the memory, the bad signal can be used for the operation of the warning device, the operation of the defective container exclusion device, or the like.

The camera 11 can use a commercially available high speed area sensor camera, for example. The illumination may be anything as long as it can irradiate light uniformly to the container spout. For example, a red LED dome illumination is very suitable. 3 is a cross sectional view of a red dome illumination. Holes 12b are formed in the top of the dome-shaped reflector, a plurality of red LEDs 12a are provided at the lower end of the inner circumference, and red light of the red LED 12a is reflected by the dome-shaped reflector and irradiated downward.

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

As shown in FIG. 2, the spout test of this invention can be performed with respect to the container conveyed by a conveyor. The container 7 is conveyed on the conveyor 14 in the arrow direction (right direction). The conveying surface of the conveyor 14 is preferably colored black to maintain inspection accuracy. The conveyor 14 is provided with the encoder 14a which generate | occur | produces a pulse whenever a conveyance surface moves a predetermined distance. Illumination 12 (dome illumination) is fixed above the conveyor 14, and the camera 11 is fixed above it. Moreover, the timing sensor 15 which detects the container which was just under the camera is provided. Reference numeral 10 denotes a PC, and includes a memory 10a, inspection gate detection means 2, screw tip left and right crack detection means 3, screw general part crack detection means 4, screw outer circumference crack detection means 5, and top surface part. The crack detection means 6 is provided. Reference numeral 13 is an exclusion control unit.

When the container 7 comes directly under the camera 11, the timing sensor 15 detects, the timing signal is sent to the PC via the exclusion control unit 13, and the shutter of the camera 11 is pressed. The captured image is sent to a PC, and various inspections are performed. If it is determined in the inspection that the defect is bad, a bad signal is sent from the PC to the exclusion control unit 13, and the exclusion control unit 13 receives the air nozzle from the timing signal of the timing sensor 15 and the pulse signal of the encoder 14a. The air nozzle 13a is operated at the timing of reaching the front side of the 13a, and the defective container is blown out and removed from the conveyor 14.

Next, the outline | summary of the process in the container spout test | inspection apparatus 1 is demonstrated by FIG.

Step 101... ... Is the data processing command ON?

Is determined first, and if it is YES,

Step 102... ... Data Processing (Defect Detected)

In the inspection gate detection means 2, the ring-shaped inspection gate is created and the detection of the screw tip position is performed, and the left and right crack detection means 3, the screw general part crack detection means 4, and the screw are performed. Inspection is performed by the outer peripheral part crack detecting means 5 and the uppermost part crack detecting means 6. This next,

Step 103... ... Is it bad?

Is determined, and if it is YES

Step 104... ... Recorded bad

Proceeds to the step of recording the defective information into the memory of the PC, and proceeds to step 105. If NO, the flow proceeds to step 105 as it is.

Step 105... ... Next Data Processing Command

The process returns to step 101, and the above processes (steps 101 to 105) are repeated for the next line data.

FIG. 5 relates to a spout without a defect in the container 7, and shows a side view at the upper end and a schematic view of the spout image captured by the camera at the lower end. In the side view of the top, reference numeral 70 denotes a screw, 71 a screw tip, and 75 a top surface. In the lower spout portion image, the first screw image 70a has a bright ring shape, and the uppermost image 75a has a slightly darker ring shape on the inside thereof, and the outer and uppermost image 75a of the screw image 70a. The inside of is darkened. In the bright screw image 70a, the screw tip image 71a is darkened.

FIG. 6 relates to a snout having a defect in the container 7, and shows a schematic view of a snout part image captured by a camera at the top and a side view at the top. In the side view of the upper part, the crack 72 is a crack of a screw tip, the crack 73 is a crack of a screw general part, the crack 74 is a crack of a screw outer peripheral part, and the crack 76 is a crack of a top surface. In the image of the lower spout portion, when there is a crack in the screw tip, the dark broken image 72a and the broken image 72b appear adjacent to each other. The broken image 73a of the screw general part appears dark in the ring of the screw image 70a. The broken image 74a of the screw outer circumference appears dark in the outer circumference of the screw image 70a. The topmost broken image 76a appears dark in the ring-shaped top surface image 75a.

(Create Inspection Gate)

Next, the creation of the inspection gate will be described based on FIGS. 7 to 12.

Step 201... ... Set the outer circumference range in the screw burn section

By this, the outer periphery range 20 between two inside and outside circles shown by a thick dashed line at the upper end of FIG. 8 is set in the spout portion image. The center coordinates and the radius of these two dashed circle circles are preset. The inspection line is automatically drawn radially from the center of the two inner and outer circles, and edge detection on the inspection line is performed between the two inner and outer circles. The density is detected as an edge where the concentration rapidly changes from light to dark and from dark to light. When the edge inspection is performed from the outer circle to the inner circle on the condition of changing from dark to bright and detecting the largest circle, the thread outer periphery is detected as an edge, and the circle is approximated to the point of the detected thread outer periphery. 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 periphery edge 20a is formed.

Step 202... ... Can the outer circumferential edge of the screw image be detected and the center position calculated?

By the way, as shown in the lower part of FIG. 8, it is judged whether the outer periphery edge 20a was formed or the center position O1 was computed, and when NO, a bad signal is output as NG, and when it is YES

Step 203... ... Set the inner circumferential range in the screw image area from the center position of the outer circumferential edge.

Processing is performed. This sets the inner circumferential circle range 21 between the two inner and outer circles indicated by a thick chain line at the upper end of FIG. The center of these two dashed circle | round | yen circles is the center O1 of the outer periphery edge 20a, and the radius is preset. Thereafter, the inspection line is automatically drawn radially from the center of the two inner and outer circles, and edge detection on the inspection line is performed between the two inner and outer circles. When the edge inspection is performed from the inner circle to the outer circle on the condition of detecting the largest circle that changes from dark to bright, as shown in the lower part of FIG. 9, the small dashed line circle of the screw image 70a is used. Substantially coincides with the inner circumference, and an inner circumferential edge 21a is formed. Thereby, the position (coordinate) of the screw image 70a on the imaging screen is determined.

Step 204... ... Can the inner circumferential edge of the thread 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 or the center position O2 is calculated. If NO, a bad signal is issued as NG, and in the case of YES The flow proceeds to step 205.

The above steps 201 to 204 are processed by the ring-shaped inspection gate detecting means 2a, and subsequent steps 205 to 209 are processed by the screw tip position detecting means 2b.

Step 205... ... Set the ring-shaped inspection gate on the thread image to detect the end of the thread

Processing is performed. 10 is an example of a ring shaped inspection gate 22. In this way, the ring-shaped inspection gate 22 is preferably set to be outside the inner circumferential edge 21a by a few pixels (for example, 2-3 pixels) outside the inner circumferential edge 21a. Do.

Step 206. ... Was it possible to detect dark areas with more than a certain shade of difference?

In Fig. 10, as indicated by the arrows in Fig. 10, the inside of the ring-shaped inspection gate 22 is subjected to a difference in light and shade along the circumferential direction, and a pair of edges that turn from bright to dark and edges that turn from dark to bright is found. The darker the difference and the closer the pair is to the setting, the more it is detected as a screw tip. The pair interval is determined in advance.

Step 207... ... Set the screw tip inspection gate on the detected part

In FIG. 12, the screw tip inspection gate 23 is set to include the detected dark portion. The size of the screw tip inspection gate is determined in advance. After that,

Step 208... ... Pattern matching of registration image in the screw tip inspection gate

By this, the position of the screw tip is detected. Reference numeral 77 in Fig. 12 denotes a registered typical screw tip image, and pattern matching between this and the image in the screw tip inspection gate 23 is performed. The pattern match ratio is determined in advance. After that,

Step 209. ... Are there any screw tip images that exceed the set pattern match ratio?

Is judged, and if a match is found, the image is judged to be a screw tip, and is passed to the screw tip left and right crack detection means 3, and when only an image that does not exceed the pattern match ratio is found, it is set as NG and a bad signal. Comes out.

(Break end detection of screw tip)

Next, based on FIG. 11, 12, the crack detection of a screw tip left and right is demonstrated.

Step 301. ... Set left and right inspection gates on left and right sides of screw tip

By this, the left and right inspection gates 24 are set adjacent to the left and right sides of the screw tips detected in the pattern match. The size of the left and right inspection gates 24 is determined in advance. After that,

Step 302. ... Set the dark and light threshold values for the left and right inspection gates

By this, the threshold value in the detection of the screw tip left and right portions is set. Specifically, the dark and dark threshold value detects pixels darker than the set threshold value, and the area threshold is the pixel number threshold value of the mass of dark pixels below the dark and dark difference threshold value. After that

Step 303... ... In the left and right inspection gates, are there pixels darker than the shade difference threshold?

In each of the left and right inspection gates, it is judged whether or not there is a pixel below the light-difference threshold value, and in the case of NO, it is determined as good quality (no crack in the left and right ends of the screw tip), and in the case of YES,

Step 304... ... Are there any images above the area threshold at the left and right inspection gates?

By this, it is judged whether or not the number of pixels of the mass below the light-difference threshold exceeds the area threshold, and in the case of NO, it is determined as good quality (no crack in the left and right ends of the screw tip), and in the case of YES, the screw tip right and left It is determined that there is a negative crack (defect).

12 shows an example in which the screw tip is broken, and broken images 72a and 72b are darkened in the ring-shaped inspection gate 22. The broken image 72a is pattern matched because it resembles the shape of the registered image 77, but since the left and right inspection gates 24 are set and inspected adjacent thereto, it is determined that the broken image 72b is defective. do. In this invention, the crack of a screw tip is detected in this way.

(Screw normal part crack detection)

Next, based on FIGS. 13 and 14, crack normal detection will be described.

Step 401... ... Set up the split inspection gate by dividing the ring shape inspection gate into radial lines

By this, as shown in FIG. 14, the division | segmentation inspection gate which divided the part of the ring-shaped inspection gate 22 other than the screw tip inspection gate 23 (pattern matched) into the radial line in multiple numbers. Write (25). The split inspection gate excludes the screw tip inspection gate portion. After that,

Step 402. ... Set the threshold and area threshold of the segmentation inspection gate

By this, the threshold value in the screw general part crack detection is set. Specifically, the dark and dark threshold value detects pixels darker than the set threshold value, and the area threshold is the pixel number threshold value of the mass of dark pixels below the dark and dark difference threshold value. After that,

Step 403... ... In the segmentation check gate, are there pixels darker than the shade difference threshold?

In each of the division inspection gates, it is judged whether or not there is a pixel below the dark-difference threshold value, and when it is NO, it is determined as good quality (no crack in the screw general part), and when it is YES

Step 304... ... Are there any images above the area threshold at the split inspection gate?

By this, it is judged whether or not the number of pixels of the mass below the light-difference threshold exceeds the area threshold, and when NO, it is determined as good quality (no crack in the screw general part), and in the case of YES, the screw general part is broken It is determined that there is (defect).

14 shows an example in which there is a broken image 73a due to the crack 73 of the screw general portion, and because the broken image 73a is darker than other portions of the divided inspection gate, there is a broken (defect) portion of the screw general portion. Is determined.

(Screw break detection of outer circumference)

Next, based on FIG. 15, 16, the crack detection of a screw outer peripheral part is demonstrated.

Step 501... ... Set a split inspection gate for outer edge detection by dividing a ring shaped region including a ring shaped gate into radial lines

By this, the division inspection gate 26 for outer edge detection is set in the spout portion image. As shown in FIG. 16, it is preferable that the screw outer peripheral edge 20a is contained in the ring-shaped area at this time. The outer edge detection split inspection gate 26 excludes the screw tip inspection gate 23 (pattern matched).

Step 502... ... Sensitivity for detecting the outer edge at the split inspection gate for outer edge detection

In Fig. 16, as indicated by the thick arrows in Fig. 16, the outer edge detection divided inspection gate is searched from the outside to the inside to detect the position of the outer edge which is equal to or higher than the brightness set by the sensitivity. By setting the sensitivity, it is possible to detect an edge having a high dark difference or to detect an edge having a low dark difference.

Step 503... ... Sets the threshold value of the outer edge difference of the divided inspection gate for detecting the neighboring outer edge.

In Fig. 3, the distance from the outer edge position detected for each outer edge detection inspection gate to the center coordinate is calculated (lower dashed line arrow in Fig. 16). The unevenness of the outer circumference is calculated by calculating the difference in the distance calculated between adjacent gates over the outer circumference. Set the threshold value of the difference at the time of difference. After that,

Step 504... ... Are there any images that exceed the outer edge difference threshold?

As shown by an arrow at the lower end of Fig. 16, scanning is performed in the inward direction from the outward direction of each of the outer periphery edge detection divided inspection gates, the distance from the detected edge position to the center coordinate is calculated, and each of the neighboring perimeters The difference is determined for each edge detection gate for edge detection, and it is determined whether or not it exceeds the threshold value. If NO, it is judged as good quality (no crack in the outer peripheral part of the screw). Is determined to be present.

In the lower part of FIG. 16, there is a broken image 74a due to the crack 74 of the screw outer peripheral portion, whereby the length from the edge to the center detected by the divided inspection gate for outer edge detection of the portion is determined. It becomes shorter than neighboring, and a screw outer part crack is detected.

(Top crack detection)

Next, based on FIG. 17 and FIG. 18, crack detection of a screw outer peripheral part is demonstrated.

Step 601... ... Set up the split top inspection gate with the spout top part divided by radial lines

The ring-shaped top surface inspection gate 27 is set on the ring-shaped top surface image 75a in the spout portion image by the processing of. Although there are various methods of setting the top surface inspection gate 27, for example, a circle whose radius is smaller than the inner circumferential edge 21a is the outer circumference of the top surface inspection gate, and a circle having a smaller number of pixels having a suitable radius is formed. There is a way. In addition, the top inspection gate 27 is divided into radial lines, and as shown in FIG. 18, the top inspection gate 27a is set. After that,

Step 602... ... Sets the shade and area thresholds of the topmost split inspection gate.

By this, the threshold value in the top surface crack detection is set. Specifically, the dark and dark threshold values detect pixels darker or lighter than the set threshold, and the area threshold is the pixel count threshold of the darker or lighter pixels. After that,

Step 603... ... At the top splitting inspection gate, are there any images that exceed the shade difference threshold?

Is judged whether or not there is a pixel exceeding the dark-difference threshold value in each top face division inspection gate, and when it is NO, it is determined as good quality (no crack of the top face), and when YES,

Step 604... ... At the top splitting inspection gate, are there any images that exceed the area threshold?

By this, it is judged whether or not the number of pixels of the mass exceeding the dark-difference threshold value exceeds the area threshold value, and when NO, it is determined as good quality (no crack on the top surface), and when YES, crack on the top surface (defect) Is determined to be present.

18 shows an example in which there is a broken image 76a due to the crack 76 on the top surface, and because the broken image 76a is brighter than other portions of the top split inspection gate, the top surface is broken (defects). It is determined.

It is determined as NG by the inspection gate detecting means 2, or the left and right crack detection means 3 of the screw tip, the screw general part crack detection means 4, the screw outer part crack detection means 5, and the top surface crack detection means 6 The container, which is determined to be defective in any of the detecting means, is excluded by the air nozzle 13a of FIG.

1 spout inspection device
10 pcs
10a memory
11 Camera
12 dome lights
13 exclusion control unit
13a air nozzle
14 conveyor
14a encoder
15 timing sensor
2 inspection gate detection means
2a ring shape inspection gate detection means
2b screw end position detecting means
20 Outsourcing Ranges
20a Outsourcing Edge
21 Range of Members
21a inner circle edge
22 ring geometry inspection gate
23 thread end inspection gate
24 Left and Right Inspection Gate
25 split inspection gate
26 Split gate for outer edge detection
27 top inspection gate
27a Top View Split Inspection Gate
3 Screw tip crack detection means
4 screw General part crack detection means
5 Screw outer crack detection means
6 Top surface crack detection means
7 glass bottles
70 screws
70a screw burn
71 screw ends
71a screw tip burn
72 broken
72a cracked burn
72b cracked burn
73 broken
73a cracked burn
74 broken
74a cracked burn
75 top
75a top burn
76 broken
76a cracked burn
77 registration images

Claims (9)

Imaging the container spout with a camera from above the container;
Creating a ring-shaped inspection gate on the ring-shaped screw image in the captured image,
A step of finding a dark portion exceeding a predetermined shade of difference in the ring shape inspection gate;
Creating a screw tip inspection gate in a region of a part of the ring-shaped inspection gate including the dark portion;
A step of finding a screw tip image that matches the registered image of the screw tip registered in advance in this screw tip inspection gate;
Creating left and right inspection gates in a region of a part of the ring-shaped inspection gate on both sides of the pattern-matched screw tips;
A container spout which has a step of detecting a dark portion exceeding a predetermined light shade and an area within this left and right inspection gate, and determining the dark portion exceeding the predetermined dark difference and an area as a defect. method of inspection. The method of claim 1,
Further, a step of creating a divided inspection gate in which a portion other than the screw tip inspection gate is divided into a plurality of radial lines as the ring-shaped inspection gate, and exceeding a predetermined shade and area in each of the divided inspection gates The container spout part inspection method characterized by having a step of detecting a dark part, and determining the dark part which exceeds the said predetermined | prescribed light difference and area as a defect. The method of claim 1,
Further, a step of creating a divided inspection gate for outer edge detection in which a plurality of ring-shaped regions including the ring shaped inspection gate is divided into radial lines in a plurality, and the divided inspection gates for outer peripheral edge detection are formed from the outside to the inside. Has a step of detecting the position of the outer edge which is searched for and is equal to or greater than a predetermined brightness, and there is a defect when the distance from the outer edge position of the divided inspection gate for neighboring outer edge detection to the center exceeds a predetermined threshold value Container spout inspection method characterized in that it is determined. The method of claim 1,
In addition, a step of creating a ring-shaped top surface inspection gate on an image of the top of the ring-shaped spout portion in the captured image, and creating a top surface division inspection gate obtained by dividing the top surface inspection gate into a plurality of radial lines. And detecting a dark portion or a bright portion exceeding a predetermined shade and difference in the uppermost divided inspection gate, and determining the dark portion or a bright portion exceeding the predetermined shade and difference as a defect. How to check the snout. Lighting to light the container spout,
A camera for capturing the container spout from above;
The ring-shaped inspection gate is created on the ring-shaped screw image in the spout portion image captured by the camera, the dark portion exceeding a predetermined shade is found in the ring-shaped inspection gate, and the ring including the dark portion Inspection gate detection means for creating a screw tip inspection gate in a portion of the shape inspection gate and finding a screw tip image that matches the registered image of the screw tip registered in advance in the screw inspection gate;
Left and right inspection gates are created in regions of a part of the ring-shaped inspection gates on both sides of the pattern-matched screw tips, and dark areas exceeding a predetermined shade and area are detected in the left and right inspection gates. And a screw tip left and right crack detection means for determining a dark portion exceeding the predetermined shade and area as a defect. The method of claim 5, wherein
Further, as the ring-shaped inspection gate, a divided inspection gate in which a portion other than the screw tip inspection gate is divided into a plurality of radial lines is created, and a dark portion exceeding a predetermined shade and area in each of the divided inspection gates. And screw general part crack detection means for detecting as a defect a dark portion exceeding the predetermined shade and area as a defect. The method of claim 5, wherein
Further, a divided inspection gate for outer edge detection is obtained by dividing a plurality of ring-shaped regions including the ring-shaped inspection gate into radial lines, and the divided inspection gate for outer edge detection is searched from the outside to the inside. Screw outer circumference broken by detecting the position of outer circumferential edge that is equal to or greater than a predetermined brightness and determining that there is a defect when the distance from the outer circumferential edge position of the divided inspection gate for neighboring outer circumferential edge detection exceeds the predetermined threshold value Container spout inspection apparatus characterized by having a detection means. The method of claim 5, wherein
Further, a ring-shaped top inspection gate is created on the image of the top of the ring-shaped spout in the captured image, and a top split inspection gate is formed by dividing the top inspection gate into a plurality of radial lines. Characterized in that it has a top surface crack detection means for detecting a dark portion or a bright portion exceeding a predetermined dark shade and area within the inspection gate, and determining the dark portion or a bright portion exceeding the predetermined shade and difference and area as a defect. Container spout inspection apparatus made with. The method of claim 5, wherein
The container spout inspection apparatus, wherein the illumination and the camera are provided on the conveying means of the container, and the camera photographs the container being conveyed by the conveying means.

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