TWI583943B - Bottle flaw defect detection device and method thereof - Google Patents

Description

Bottle mouth defect detecting device and method thereof

The invention relates to a bottle mouth, and more particularly to a device for detecting the end face of a bottle mouth and a method therefor.

Glass bottles can be filled with liquids, which is one of the most common beverage containers for commercial beverages. The glass bottles are more sealed than aluminum foils, and often use more cosmetic or health drinks that are more susceptible to deterioration. They are widely used beverage containers.

Unevenness, notches, scratches, etc. of the bottle mouth may cause leakage after sealing. There are a number of techniques for verifying the finish of the bottle. For example, the Taiwan New Type Announcement No. 191541 "Installation of Bottles or Their Similar Devices" patent mainly adopts the method of gray value evaluation and comparison. When the difference of gray values between two adjacent areas is greater than the set A maximum limit (ie, the existence of a defect). The bottle is considered to be bad and it is rejected. In this image processing method, it is necessary to repeatedly compare the gray values of adjacent regions, especially when the resolution is improved, the number of adjacent regions will increase rapidly, that is, the number of comparisons will increase rapidly, resulting in an operation amount. It is too large to judge whether it is a defective product in a short period of time. It cannot keep up with the output of the existing production line, so it can only be carried out by sampling.

The Taiwan Patent No. 592295 "Botting and Teeth Detection Equipment" is also based on the method of gray scale comparison to determine whether there is a defect, and in order to speed up the image processing speed, the image processing technique uses a one-dimensional curve approximation. Instead of a two-dimensional surface approximation, the complexity of the operation is much reduced, so that the balance of speed and precision is achieved. However, this technology still cannot keep up with the demand of the current production line.

In addition, Taiwan Patent No. 371745 "Bottle Thread Inspection System and Operation Method" converts images into black and white images, and then compares the white image area of a specific area to determine whether a defect occurs, but it is a total area. In comparison, when different defects are mixed, it may cause the white image area to still conform to the specification. In order to increase the accuracy, it is necessary to reduce the area of a specific area, which also causes an increase in the amount of calculation, and the speed still cannot keep up with the current production. Line demand.

Accordingly, the main object of the present invention is to disclose a bottle mouth defect detecting device and method thereof that can meet the requirements of current production lines.

In order to achieve the above object, the present invention is a bottle mouth defect detecting device for detecting the flatness of a bottle mouth end face of a plurality of glass bottles, the device comprising an image capturing unit, an image processing unit and a glass bottle transport unit, wherein The image capturing unit captures a bottle end face image of the glass bottles; the image processing unit performs a Blob algorithm to obtain the number of spots of the bottle end face image, and judges the glass bottles according to the number of spots. Whether the end of the bottle mouth is complete; and the glass bottle transport unit transfers the glass bottles to the corresponding image capturing unit.

In the method of the present invention, the glass bottles are transferred to the corresponding image capturing unit by the glass bottle transport unit; and the image of the bottle end is captured by the image capturing unit. Then, an image processing unit performs a Blob algorithm to obtain the number of spots of the image of the end face of the bottle mouth, thereby determining whether the end faces of the glass bottles are intact. If the number of spots is only one, indicating that the end face of the bottle mouth is not a complete closed ring, it can be judged that there is a flaw in the end face of the bottle mouth, that is, the end face of the bottle mouth is incomplete, and there is a problem of air leakage when used.

Accordingly, the present invention performs the Blob algorithm through the image processing unit to obtain the number of spots of the end face image of the bottle mouth, and can determine whether the end faces of the glass bottles are complete, that is, only a simple Blob algorithm and a simple Logical judgment, so the processing speed is quite fast, which can meet the capacity requirements of the current production line.

10‧‧‧Image capture unit

11‧‧‧Photosensitive coupling element

12‧‧‧focus lens

13‧‧‧Light source

131‧‧‧Lighting diode

20‧‧‧Image Processing Unit

30‧‧‧ glass bottle transport unit

31‧‧‧Conveyor belt

32‧‧‧Secondary device

321‧‧‧Put

33‧‧‧Asymmetric temporary storage area

90, 90A‧‧‧ glass bottles

91‧‧‧End of mouth image

Figure 1 is a front elevational view showing the structure of the detecting device of the present invention.

Figure 2 is a plan view showing the structure of the detecting device of the present invention.

FIG. 3 is a schematic diagram of a complete bottle mouth end image according to the Blob calculation of the present invention.

4 is a schematic view of an incomplete bottle end face image according to the Blob calculation of the present invention.

5A-5C are schematic views showing the operation of the bottle dividing device of the present invention.

The detailed description of the preferred embodiments of the present invention will be apparent from

Referring to FIG. 1 and FIG. 2, the present invention is a bottle mouth defect detecting device and method thereof for detecting the flatness of a bottle mouth end face of a plurality of glass bottles 90, the device comprising an image capturing unit 10 An image processing unit 20 and a glass bottle transport unit 30, wherein the image capturing unit 10 captures a bottle end face image 91 (shown in FIG. 3) of the glass bottles 90, and the image capturing unit 10 can A focusing lens 12 and a focusing light source 13 are disposed in the photosensitive coupling element 11. The light source 13 can be a plurality of LEDs 131, and the LEDs The body 131 surrounds the focus lens 12.

The image processing unit 20 performs a Blob algorithm to obtain the number of spots of the bottle end face image 91, and determines whether the end faces of the glass bottles 90 are complete according to the number of spots. The so-called Blob algorithm is a fairly mature image processing technology. A black-and-white image processing that converts a grayscale image through an arbitrary threshold reference to 0 or 1 is called "binarization processing" (usually black (0), white (1)). The method of analyzing the black and white image that completes the binarization process is called "BLOB". That is to say, the Blob algorithm can analyze the shape characteristics of black (0) and white (1) blocks, such as the presence, size, area, position, length and direction of black and white images, which is one of the most basic methods of image processing.

The glass bottle transport unit 30 transfers the glass bottles 90 to the corresponding image capturing unit 10, and the glass bottle transport unit 30 can have a conveyor belt 31, a bottle dividing device 32 and an abnormal temporary storage area 33. The conveyor belt 31 is configured to transport the glass bottles 90 through the image capturing unit 10, and when the image processing unit 20 determines that the bottle end faces of the glass bottles 90 are incomplete, the bottle dividing device 32 is displaced to The abnormal storage area 33 is stored, and the dispensing device 32 can be a push rod 321 , and the push rod 321 and the abnormal temporary storage area 33 are respectively disposed on opposite sides of the conveyor belt 31 , and the push rod 321 There is a starting position that does not pass through the conveyor belt 31 and a pushing position that penetrates the conveyor belt 31.

The method of the present invention, the steps are as follows:

First, the glass bottles 90 are transferred by the glass bottle transport unit 30 to the corresponding image capturing unit 10. The glass bottle transport unit 30 can have a conveyor belt 31, a bottle dividing device 32 and an abnormal temporary storage area 33. The conveyor belt 31 is used to transport the glass bottles 90 through the image capturing unit 10, and can be transferred. The glass bottles 90 are corresponding to the image capturing unit 10.

Please refer to FIG. 3 and FIG. 4 for a complete and incomplete schematic diagram of the end face image 91 of the bottle mouth after Blob calculation. The present invention then captures the image by the image capturing unit 10. The image capturing unit 10 of the glass bottle 90 can include the photosensitive coupling element 11 , the focusing lens 12 and the lighting source 13 , wherein the focusing lens 12 can be used for the glass bottle 90 The focal length of the focus lens 12 is adjusted in height, that is, the glass bottles 90 of various sizes can be applied.

Then, the Blob algorithm is used by the image processing unit 20 to obtain the number of spots of the end face image 91 of the bottle mouth. The image of the end face image 91 of the bottle mouth may be as shown in FIG. 3 or FIG. 4 by the Blob algorithm. According to the number of spots, it can be judged whether the end faces of the glass bottles 90 are intact. In more detail, if the end face of the bottle mouth has a through defect, that is, when the end face of the bottle mouth is incomplete, the image of the end face of the bottle mouth is analyzed by the Blob algorithm, and the number of spots is only one (as shown in Fig. 4). When the number of spots is only one, it can be judged that there is a flaw in the end face of the bottle mouth, and there is a problem of air leakage when used; on the other hand, when the end face of the bottle mouth is complete, the image of the end face of the bottle mouth is subjected to Blob calculation. After the analysis, there will be two spots (such as "Fig. 3"), so when there are two spots, it can be determined that the end faces of the glass bottles 90 are intact.

Please refer to FIG. 5A to FIG. 5C. Finally, when the image processing unit 20 determines that the end faces of the glass bottles 90A are incomplete, the image separation unit 32 can be displaced to the The abnormal temporary storage area 33 is stored, and the splitting device 32 is used as an example of the push rod 321 . Since the push rod 321 and the abnormal temporary storage area 33 are respectively disposed on opposite sides of the conveyor belt 31, when the push When the rod 321 is displaced from the starting position to the pushing position, the glass bottles 90A whose incomplete end faces are moved into the abnormal temporary storage area 33 (as shown in FIG. 5A), and for the speed of movement In the above requirement, the incomplete glass bottle 90A is slid into the abnormal temporary storage area 33 by inertia, that is, the push rod 321 only needs to extend into the conveyor belt 31 by about one quarter to one third. Retracting (such as "Fig. 5A" - "Fig. 5C"), the incomplete glass bottle 90A can be moved into the abnormal temporary storage area 33.

As described above, the present invention performs a Blob algorithm through the image processing unit to obtain the number of spots of the image of the end face of the bottle mouth, and can determine whether the end faces of the glass bottles are intact, and the bottle dividing device can be used. The complete glass bottles are detected, which requires only a simple Blob algorithm and simple logic judgment. The burden of image calculation is relatively small, so the processing speed is quite fast, which can meet the production capacity requirements of the current production line.

The above is only the preferred embodiment of the present invention, and the scope of the present invention is not limited thereto, that is, the simple equivalent changes and modifications made by the scope of the invention and the description of the invention are All remain within the scope of the invention patent.

10‧‧‧Image capture unit

11‧‧‧Photosensitive coupling element

12‧‧‧focus lens

13‧‧‧Light source

131‧‧‧Lighting diode

20‧‧‧Image Processing Unit

30‧‧‧ glass bottle transport unit

31‧‧‧Conveyor belt

32‧‧‧Secondary device

321‧‧‧Put

90, 90A‧‧‧ glass bottles

Claims (10)

[Item 1]
A bottle mouth defect detecting device for detecting the flatness of a bottle mouth end face of a plurality of glass bottles, comprising:
An image capturing unit, the image capturing unit captures a bottle end face image of the glass bottles;
An image processing unit, the image processing unit performs a Blob algorithm, obtains the number of spots of the image of the end face of the bottle mouth, and determines whether the end faces of the glass bottles are complete according to the number of spots; and a glass bottle transport unit, The glass bottle transport unit transfers the glass bottles to the corresponding image capturing unit. [Item 2]
The bottle mouth defect detecting device of claim 1, wherein the image capturing unit comprises a photosensitive coupling element, and the capturing image focuses on a focusing lens and a light source in the photosensitive coupling element. [Item 3]
The bottle mouth defect detecting device of claim 2, wherein the light source is a plurality of light emitting diodes, and the light emitting diodes surround the focus lens. [Item 4]
The bottle mouth defect detecting device according to claim 1, wherein the glass bottle transport unit has a conveyor belt, a bottle dividing device and an abnormal temporary storage area, wherein the conveyor belt is used to transport the glass bottles through the The image capturing unit, and when the image processing unit determines that the end faces of the glass bottles are incomplete, the bottle dividing device is displaced to the abnormal temporary storage area for storage. [Item 5]
The bottle mouth defect detecting device of claim 4, wherein the bottle dividing device is a push rod, and the push rod and the abnormal temporary storage area are respectively disposed on opposite sides of the conveyor belt, and the pushing The rod has a starting position that does not pass through the conveyor belt and a push position that penetrates the conveyor belt. [Item 6]
A bottle mouth defect detecting method for detecting the flatness of a bottle mouth end face of a plurality of glass bottles, the steps comprising:
Transferring the glass bottles to a corresponding image capturing unit by a glass bottle transport unit;
The image capturing unit captures a bottle end face image of the glass bottles;
The blob algorithm is performed by an image processing unit to obtain the number of spots of the image of the end face of the bottle mouth, thereby determining whether the end faces of the glass bottles are intact. [Item 7]
The method for detecting a bottle mouth defect according to the sixth aspect of the invention, wherein the image capturing unit comprises a photosensitive coupling element, and the focusing image is focused on the focusing lens and the light source in the photosensitive coupling element, wherein The focus lens adjusts the focal length of the focus lens by the height of some glass bottles. [Item 8]
The bottle mouth defect detecting method according to claim 6, wherein the light source is a plurality of light emitting diodes, and the light emitting diodes surround the focusing lens. [Item 9]
The bottle mouth defect detecting method according to claim 6, wherein the glass bottle transport unit has a conveyor belt, a bottle dividing device and an abnormal temporary storage area, and the conveyor belt is used for conveying the glass bottles through the The image capturing unit, and when the image processing unit determines that the end faces of the glass bottles are incomplete, the bottle dividing device is displaced to the abnormal temporary storage area for storage. [Item 10]
The bottle mouth defect detecting method according to claim 9, wherein the bottle dividing device is a push rod, and the push rod and the abnormal temporary storage area are respectively disposed on opposite sides of the conveyor belt, and the pushing The rod has a starting position that does not pass through the conveyor belt and a pushing position that penetrates the conveyor belt. When the pushing rod is displaced from the starting position to the pushing position, the end surface of the bottle opening is incomplete. The glass bottle is pushed into the abnormal temporary storage area.