JP2000055640A - Ptp seal inspecting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To detect a fine and irregular defect such as a rivelling without being affected by illuminance change, and to eliminate an influence of a printed matter. SOLUTION: This inspecting device has a light source 14 for irradiating a PTP sheet S with light, the first camera 11 for image-picking up an image reflected from the PTP sheet S, the second camera 12 for image-picking up the image reflected from the PTP sheet S, a phase limited correlation program 21 which Fourier-transforms an image data image-picked up by the first camera 11 to provide the first phase information, which Fourier-transforms an image data image-picked up by the second camera 12 to provide the second phase information, and which operates a correlation between the first phase information and the second phase information, and a seal defect determining program 22 for detecting a seal defect of the PTP sheet S based on a peak value found by the program 21.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a PTP seal inspection apparatus for detecting a seal failure of a PTP sheet formed by storing a tablet or the like in a molding recess of a synthetic resin sheet and thermally bonding an aluminum film thereon. It is about.

[0002]

2. Description of the Related Art As a PTP seal inspection apparatus, for example, Japanese Patent Application Laid-Open No. Sho 62-163950 discloses a method of projecting light on an aluminum film surface, detecting reflected light, and judging good / defective by increasing or decreasing the amount of light. An apparatus for determining is described. Japanese Patent Publication No. 7-40001 discloses that an aluminum film surface is irradiated with light to detect reflected light,
An apparatus is described in which a defective seal is determined when the detected light amount exceeds a predetermined value. In addition, 6-1895
In Japanese Patent Application Laid-Open No. 7-107, an PTP sheet to be inspected is illuminated diagonally from above by two illuminations, an illuminated PTP sheet is photographed from directly above by a television camera, and an image captured by an image processing apparatus is taken. To determine a PTP sheet seal failure.

[0003]

However, the conventional PTP seal inspection apparatus has the following problems. (1) In the device described in Japanese Patent Application Laid-Open No. Sho 62-163950, a defect is determined by increasing or decreasing the reflected light.
There is a problem that the influence of the intensity of the illumination is directly affected, and the defect determination becomes inaccurate due to a change in external light or the like. Further, in the apparatus described in Japanese Patent Publication No. 7-40001, since the defect is determined based on the amount of reflected light, it is directly affected by the intensity of illumination, and the defect is not determined due to a change in external light or the like. There was a problem that was accurate.

(2) A PTP sheet to be inspected by the PTP seal inspection apparatus is a PTP sheet formed by storing a tablet or the like in a pocket which is a molded concave portion of a synthetic resin sheet and thermally bonding an aluminum film thereon. is there. In the PTP sheet, the synthetic resin and the aluminum film are adhered and sealed at locations other than the pockets. If a seal failure such as wrinkles exists in the seal bonding portion, the confidentiality of the tablet or the like cannot be maintained. However, in the device described in Japanese Utility Model Laid-Open No. 6-18957, it is possible to determine whether the mirror is in a mirror-finished state or in a mesh-processed state,
In addition, there is a problem that irregular defects cannot be detected.

(3) In many cases, printing is performed on the aluminum film surface of the PTP sheet.
In the two prior arts, there is a problem that the defective determination is inaccurate because the reflected light and the captured image are directly affected by the printed portion.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and is not affected by a change in illuminance, can detect fine and irregular defects such as wrinkles, and is not affected by printed matter. It is an object to provide a PTP seal inspection device that does not have any.

[0007]

In order to achieve this object, a PTP seal inspection apparatus according to the present invention has the following configuration. (1) A light source that irradiates light to the PTP sheet, a first camera that captures an image reflected from the PTP sheet, a second camera that captures an image reflected from the PTP sheet, and image data captured by the first camera. Fourier transform, obtain the first phase information, Fourier transform the video data captured by the second camera, obtain the second phase information, calculate the correlation between the first phase information and the second phase information By doing, PTP
And a defective seal judging means for detecting a defective seal of the sheet.

(2) It has a light source for irradiating light to the PTP sheet and a camera for picking up an image reflected from the PTP sheet, and stores phase information obtained by Fourier-transforming the image data of the reference PTP sheet. Then, by calculating the correlation with the phase information obtained by Fourier transforming the image data of the PTP sheet to be inspected captured by the camera,
A seal failure determining means for detecting a seal failure of the PTP sheet to be inspected;

(3) A light source for irradiating the PTP sheet with light, a camera for capturing an image reflected from the PTP sheet, and transport means for transporting the PTP sheet below the camera, the PTP captured by the camera The image data of the sheet is Fourier transformed to obtain first phase information, and the conveying device conveys the PTP sheet by a predetermined distance, and then the image data of the PTP sheet captured by the camera is Fourier transformed to obtain second phase information. A seal failure determining means for detecting a seal failure of the PTP sheet by calculating a correlation between the first phase information and the second phase information.

(4) A light source for irradiating the PTP sheet with light, a camera for capturing an image reflected from the PTP sheet, and image data of the PTP sheet captured by the camera are divided into two or more sections. Fourier transform from the video data to obtain the first phase information, Fourier transform from the second section of the video data to obtain the second phase information, and calculate the correlation between the first phase information and the second phase information By that, P
A seal failure determining means for detecting a seal failure of the TP sheet.

(5) A light source for irradiating light to a PTP sheet having a printed portion on its surface, a camera for selectively picking up only infrared light among reflected light reflected from the PTP sheet, and video data picked up by the camera And a defective seal judging means for detecting a defective seal of the PTP sheet. (6) In the PTP seal inspection device according to any one of (1) to (4), the first camera and the second camera selectively capture only infrared light among reflected light reflected from the PTP sheet. It is characterized by being.

Next, the PTP of the present invention having the above-mentioned structure will be described.
The operation of the seal inspection device will be described. The PTP sheet to be inspected by the PTP seal inspection apparatus is a flat plate having pockets containing tablets and the like arranged in a fixed number of rows at regular intervals. A light source irradiates the PTP sheet with light. A first camera captures an image of a first predetermined area of a PTP sheet illuminated by a light source and captures first video data. Similarly,
A second camera captures an image of a second predetermined area of the PTP sheet illuminated by the light source, and captures second video data. The captured first video data is Fourier transformed. Here, the first predetermined region is a region including a predetermined row of pockets storing tablets and the like, and is a region having no pocket at the boundary. The second predetermined region is a region that is shifted by a predetermined distance from the first region, and is a region that looks exactly the same as the first predetermined region in appearance if the PTP sheet is a non-defective product.

It is known that, among the information subjected to the Fourier transform, the phase information contains much more information on the form of an object than the amplitude information. Therefore, when obtaining the product in the spectral domain, the amplitude information is modified so as to be replaced with a fixed value, and the first phase information is obtained. Also,
The second phase information is obtained from the second video data by the same method. Next, the correlation between the first phase information and the second phase information is calculated. Thereby, the phase-only correlation can be obtained. If the PTP sheet has no defect, the first predetermined area captured by the first camera and the second predetermined area captured by the second camera have exactly the same appearance. Indicates a strong correlation.

On the other hand, if there is a seal failure in either of them, the correlation between the first phase information and the second phase information becomes weak. The quality of the seal can be determined based on the strength of the correlation. In addition, in the case where both of the seal defects are present, if the same wrinkles are generated in the first predetermined region and the second predetermined region, the defect of the seal cannot be detected. Is practically nonexistent, so the PTP seal inspection apparatus of the present invention has no practical problem.

In some cases, the PTP sheet is printed. At this time, since the camera uses an infrared camera equipped with a filter that passes only infrared light, the visible light reflected from the printed matter is blocked by the filter. Can be captured. Here, the infrared camera refers to a camera using a CCD having sensitivity in an infrared region. In particular, those that are not affected by the smear phenomenon due to infrared rays are more suitable. This makes it possible to determine a defect such as a wrinkle based on video data that is not affected by the printed matter, thereby improving the accuracy of the defect determination.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows the overall configuration of a PTP seal inspection apparatus according to the present embodiment. Light from the light source 14 is applied to the surface of the PTP sheet S opposite to the surface on which the pockets 16 are formed. On the surface opposite to the surface on which the pocket 16 is formed, as shown in FIGS. 2A and 2B, the lid 16b of the pocket 16 has a space on the back side and does not constitute a seal portion. Also, wrinkles may occur on the lid 16b, but this is not related to the sealing property.
6b is out of the detection target of the PTP seal inspection device of the present invention. The seal portion includes a print portion Sb on which “ABC” is printed in the drawing. 2A and 2B are different from each other in that a wrinkle F is present in the seal portion in FIG. This will be described later in detail.

The light from the light source 14 irradiates almost the entire surface of the PTP sheet S. On the upper surface of the PTP sheet S, a first camera 11 and a second camera 12 are provided at predetermined intervals. The first camera 11 and the second camera 12 are provided with an infrared filter 13 that transmits only infrared light. As shown in FIG. 1, the first camera 11 targets a first predetermined region R1 of the PTP sheet S as an imaging target. FIG. 2A shows an image when the first predetermined region R1 is visually observed. In addition, the second camera 12 targets a second predetermined region R2 of the PTP sheet S as an imaging target. FIG. 2B shows an image when the second predetermined region R2 is visually observed.

Here, the first predetermined region R1 is a region including a predetermined row of pockets containing tablets or the like, and is a region having no pocket at the boundary. The second predetermined region R2 is a region deviated from the first predetermined region R1 by a predetermined distance. If the PTP sheet S is a good product, that is, if the wrinkles F are temporarily removed,
This is an area that looks exactly the same as the first predetermined area R1 in appearance. It has been experimentally confirmed that if a region having no pocket is set as the predetermined region as in the present embodiment, even if the positioning of the PTP sheet is slightly shifted, the influence on the detection accuracy is small. .

Video data captured by the first camera 11 and the second camera 12 is input to the control device 15. The control device 15 includes a CPU 20 as an arithmetic unit, an I / O 17 as an input / output unit, a RAM 18 as a data storage unit, and a ROM 19 for storing a control program. R
The OM 19 stores a phase-only correlation program 21 and a seal failure determination program 22. The phase-only correlation program 21 and the seal failure determination program 22
It constitutes a seal failure judging means.

[0020] Of the video data obtained from the first camera 11 and the second camera 12, the lid 16b of the pocket 16 is not related to the sticker and must be excluded as data. In the present embodiment, the pocket 1 is used as an exclusion method.
The movement of the PTP sheet S is controlled so that the lid 16b of the sixth sheet is always at a predetermined position. Thus, the data value at a predetermined position corresponding to the lid 16b in the video data is replaced with zero. When it is difficult to control the PTP sheet S at the fixed position, as another method, the center of gravity of the lid 16b of the pocket 16 is obtained by image processing, and a certain area is determined from the coordinates of the center of gravity. The unit 16b may replace a predetermined data value of the video data with zero.

Conventionally, it has been known that, among the information subjected to the Fourier transform, the phase information contains much more information on the form of an object than the amplitude information. The phase-only correlation program 21 performs a Fourier transform on the data obtained by removing the data of the region of the lid 16b from the video data obtained from the first camera 11, and replaces the amplitude information with a fixed value when obtaining a product in the spectral domain. To obtain the first phase information. The phase-only correlation program 21 performs a Fourier transform on the data obtained by removing the area data of the lid 16b from the video data obtained from the second camera 12, and calculates the amplitude information with a fixed value when calculating the product in the spectral domain. The second phase information is obtained by modifying to replace.

Next, the phase only correlation program 21
The correlation between the first phase information and the second phase information is calculated.
That is, a composite image is obtained by multiplying the first phase information by the complex conjugate of the second phase information. Then, by subjecting the synthesized image to inverse Fourier transform, the image converted to the correlation domain is set as a correlation intensity image. Then, the similarity between the first predetermined region R1 and the second predetermined region R2 can be determined by evaluating the peak value of the amplitude in the correlation strength image. The first predetermined region R1 imaged by the first camera 11 and the second predetermined region R2 imaged by the second camera 12 have exactly the same appearance unless the PTP sheet S has a defect. And the second phase information
Shows strong correlation.

On the other hand, if any one of the seal failures exists, the correlation between the first phase information and the second phase information becomes weak. The seal failure determination program 22 determines the quality of the seal based on the strength of the correlation. Here, if exactly the same wrinkles occur in the first predetermined region R1 and the second predetermined region R2, a defective seal cannot be detected, but such a possibility is practically negligible. The PTP seal inspection apparatus of the present invention has no practical problem.

Next, the operation of the PTP seal inspection device having the above configuration will be described. Light emitted from the light source 14 is reflected by the first predetermined region R1, passes through the infrared filter 13 that transmits only infrared light, and is input to the first camera 11. Therefore, the video data captured by the first camera 11 is, as shown in FIG.
The video data is obtained by removing the printing unit Sb from (a). The wrinkles F can be identified by infrared rays, and are included in the video data. The light emitted from the light source 14 is in the second predetermined region R
Infrared filter 1 that reflects at 2 and transmits only infrared light
3 and input to the second camera 12. Therefore, as shown in FIG. 3B, the video data captured by the second camera 12 is video data obtained by removing the printing unit Sb from FIG. 2B, which is a visual video.

Therefore, the same video data can be obtained whether or not there is a printed matter on the PTP sheet surface.
Since the influence of the printed matter can be eliminated, the accuracy of detecting a defective seal can be improved.

The CPU 20 executes a phase-only correlation program 2
1, the video data obtained from the first camera 11 is stored in the RAM
18 and the lid 16b of the pocket 16 is not related to the seal. Therefore, the data value of the video data corresponding to the predetermined position where the lid 16b of the pocket 16 is always present is replaced with zero and stored in the RAM 18 again. I do. Further CP
U20 is stored in RAM by the phase only correlation program 21.
The Fourier transform of the video data stored in 18 and when calculating the product in the spectral domain, the amplitude information is modified to be replaced with a fixed value, and the first phase information is obtained.
It is stored in the RAM again.

The CPU 20 executes the phase-only correlation program 2
1, the video data obtained from the second camera 12 is stored in the RAM
18 and the lid 16b of the pocket 16 is not related to the seal. Therefore, the data value of the video data corresponding to the predetermined position where the lid 16b of the pocket 16 is always present is replaced with zero and stored in the RAM 18 again. I do. Further CP
U20 is stored in RAM by the phase-only correlation program 21.
The Fourier transform of the video data stored in 18 and when calculating the product in the spectral domain, the amplitude information is modified to be replaced with a fixed value, and the second phase information is obtained.
It is stored in the RAM 18 again.

Next, the CPU 20 calculates the correlation between the first phase information and the second phase information by the phase-only correlation program 21. That is, a composite image is obtained by multiplying the first phase information by the complex conjugate of the second phase information. Then, by subjecting the synthesized image to inverse Fourier transform, the image converted to the correlation domain is set as a correlation intensity image. Then, a peak value of the amplitude is obtained from the correlation strength image. The seal failure determination program 22 evaluates the peak value obtained by the phase-only correlation program 21,
The similarity between the first predetermined region R1 and the second predetermined region R2 is determined.

That is, the first predetermined region R1 imaged by the first camera 11 and the second predetermined region R2 imaged by the second camera 12 have exactly the same appearance unless the PTP sheet S has a defect. , The first phase information and the second phase information show a strong correlation, and the peak value exceeds a predetermined value. On the other hand, when a seal failure exists in one of them, as shown in FIG. 3A, when a wrinkle F or the like exists, the correlation between the first phase information and the second phase information is weak. And the peak value becomes equal to or less than the predetermined value. When the peak value is equal to or less than the predetermined value, the seal failure determination program 22 determines that the seal is defective and outputs the occurrence of the seal failure to a central control device (not shown).

Here, the advantages of the phase-only correlation will be described. FIG. 4A shows a stereoscopically displayed composite image obtained by the PTP seal inspection apparatus according to the present embodiment. The peak value P1 protrudes to the center where the positions of the two images match, and in other parts where the positions of the two images do not match,
It is substantially zero, and the first predetermined region R1 and the second predetermined region R2
Can be determined. On the other hand, FIG.
Shows a stereoscopic display of a composite image without phase limitation. A lot of matching information exists in a part other than the center where the two images do not match together with the center 1 where the two images match. For this reason, it is difficult to judge the coincidence or non-coincidence, and it is not possible to judge good / bad. Therefore, the PTP seal inspection device of the present embodiment using the phase-only correlation
Stable and good compared to the case without phase-only correlation
You can judge the defect.

That is, in the case where the two images coincide with each other, if the phase is not limited, the coincidence information immediately becomes zero even if the amount of the shift is large although the center where the two images coincide is the peak. However, in the phase-only correlation method, the coincidence information becomes zero except for the center. On the other hand, when the two images do not match, when the phase is not limited, there is not much difference because the match mismatch is not clear from the beginning, but in the case of the phase only correlation method,
The difference in the matching information between the center and the other part is reduced, and this clearly indicates that the two images do not match.

As described in detail above, according to the PTP seal inspection apparatus of the present embodiment, the light source 14 for irradiating the PTP sheet S with light and the first camera 11 for capturing an image reflected from the PTP sheet S A second camera 12 for capturing an image reflected from the PTP sheet, and a first camera 11
Performs a Fourier transform on the video data captured by the second camera 12, obtains first phase information, performs a Fourier transform on the video data captured by the second camera 12, obtains second phase information, and obtains the first phase information and the second phase information. Since it has a phase-only correlation program 21 for calculating the correlation with the information and a seal failure determination program 22 for detecting the seal failure of the PTP sheet S from the peak value obtained by the phase-only correlation program 21, the lighting Defective sealing can be detected without being affected by strength. In addition, since small defects such as wrinkles can be detected, it is possible to guarantee sealing performance with high accuracy.

Further, the PTP seal inspection apparatus according to the present embodiment selects the light source 14 for irradiating light to the PTP sheet S having the printed portion Sb on the surface, and selects only infrared light from the reflected light reflected from the PTP sheet. Cameras 11 and 12 having a filter 13 for transmitting light therethrough, and cameras 11 and 1
2 calculates the image data captured by the
Seal failure judging means 2 for detecting sheet seal failure
Because of the fact that the printed image has the numbers 1 and 22, it is possible to accurately detect defects such as wrinkles while eliminating the influence of the printed matter.

It should be noted that the present invention is not limited to the above embodiment, and various changes can be made without departing from the gist of the present invention. For example, in the PTP seal inspection apparatus of the present embodiment, a filter is used to capture only infrared light with a camera. However, the same is true even if the PTP sheet is illuminated only with an infrared light source and no filter is used.

Further, only one camera device is used. First, a non-defective PTP sheet having no wrinkles on a reference seal portion is imaged, and phase information obtained by Fourier-transforming the video data is used as reference phase information. It is stored in a storage means such as a RAM. Thereafter, the PTP sheet as the subject is imaged each time, and the correlation between the phase information obtained by Fourier transforming the video data and the reference phase information stored in the storage means is calculated. The defect of the sheet can be determined. According to this method, the correlation with the reference data which is always one good product can be calculated.
Inspection results are stable.

Further, only one camera device is used.
First phase information obtained by taking an image of the TP sheet and performing Fourier transform on the video data is stored in a storage unit such as a RAM. Then, the next PTP sheet is conveyed below the camera by the conveying means, and the PTP sheet is imaged,
The second phase information obtained by Fourier transforming the video data is stored in a storage unit such as a RAM. And
By calculating the correlation between the first phase information and the second phase information, it is possible to determine whether the PTP sheet is defective. According to this method, the configuration can be simplified because it can be performed by one camera. If the data inspected this time is used as the next comparison data as the phase information to be stored in the storage means, the data is sequentially replaced with new data for each inspection, so that there is no need to manage the stored data. Further, even when the illumination or the like changes over time, since it is compared with the immediately preceding data, it is less affected by the illumination change.

Further, only one camera device is used.
The TP sheet is imaged, the video data is divided into two or more sections, the first phase information is obtained by Fourier transforming the first section video data, and the second section video data is Fourier transformed by the Fourier transform. Obtaining two-phase information, first phase information,
By calculating the correlation with the second phase information, the PTP
The defect of the sheet can be determined. In this case, it is necessary that the first section and the second section have substantially the same size. According to this method, the configuration can be simplified because it can be performed by one camera.

[0038]

According to the PTP seal inspection apparatus of the present invention, a light source for irradiating the PTP sheet with light, a first camera for capturing an image reflected from the PTP sheet, and a second camera for capturing an image reflected from the PTP sheet. Fourier transform the video data captured by the second camera and the first camera to obtain first phase information, and perform Fourier transform on the video data captured by the second camera to obtain the second phase information and obtain the first phase information. A seal failure judging means for detecting a seal failure of the PTP sheet by calculating a correlation between the phase information and the second phase information, so that the seal failure can be detected without being affected by the illumination intensity. it can. In addition, since small defects such as wrinkles can be detected, it is possible to guarantee sealing performance with high accuracy.

The PTP seal inspection device of the present invention
Calculates a light source that irradiates light to a PTP sheet with a printed part on its surface, a camera equipped with a filter that selectively transmits only infrared light among the reflected light reflected from the PTP sheet, and video data captured by the camera By doing so, since there is provided a seal failure judging means for detecting a seal failure of the PTP sheet, it is possible to accurately detect defects such as wrinkles while eliminating the influence of printed matter.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an overall configuration of a PTP seal inspection device according to an embodiment of the present invention.

FIG. 2 is a diagram in which a predetermined area of a PTP sheet to be inspected is visually observed.

FIG. 3 is an image diagram based on video data obtained by capturing an image of the area in FIG. 2 with a camera.

FIG. 4 is a diagram showing a correlation of a composite image showing a calculation result.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 First camera 12 Second camera 13 Infrared filter 14 Light source 15 Controller 18 RAM 19 ROM 20 CPU 21 Phase-only correlation program 22 Seal failure judgment program

Claims (6)

[Claims] A light source that irradiates light to the PTP sheet; a first camera that captures an image reflected from the PTP sheet; a second camera that captures an image reflected from the PTP sheet; Fourier transform the captured video data to obtain first phase information, Fourier transform the video data captured by the second camera, obtain second phase information, the first phase information and the second A seal failure judging means for detecting a seal failure of the PTP sheet by calculating a correlation with the phase information.
TP seal inspection device. 2. A light source for irradiating light to a PTP sheet, and a camera for picking up an image reflected from the PTP sheet, and storing phase information obtained by Fourier transforming image data of a reference PTP sheet. A seal failure detecting the seal failure of the inspection target PTP sheet by calculating a correlation with the phase information obtained by Fourier transforming the image data of the inspection target PTP sheet captured by the camera. A PTP seal inspection device, comprising: a determination unit. 3. A light source for irradiating the PTP sheet with light, a camera for capturing an image reflected from the PTP sheet, and transport means for transporting the PTP sheet below the camera, wherein the camera captures an image. The first phase information is obtained by Fourier transforming the video data of the PTP sheet thus obtained, and the transport device transports the PTP sheet by a predetermined distance, and the Fourier transform is performed on the video data of the PTP sheet captured by the camera. A PTP seal comprising: a seal failure judging means for detecting a seal failure of the PTP sheet by obtaining phase information and calculating a correlation between the first phase information and the second phase information. Inspection equipment. 4. A light source that irradiates light to the PTP sheet, a camera that captures an image reflected from the PTP sheet, and video data of the PTP sheet captured by the camera is divided into two or more sections. Fourier transform from the video data to obtain first phase information, Fourier transform from the second section of video data to obtain second phase information, correlation between the first phase information and the second phase information A PTP seal inspection device, comprising: a seal failure determining unit that detects a seal failure of the PTP sheet by calculating the following. 5. A light source for irradiating light to a PTP sheet having a printed portion on its surface, a camera for selectively picking up only infrared light among reflected light reflected from the PTP sheet, and an image picked up by the camera A PTP seal inspection apparatus comprising: a seal failure determining unit that detects a seal failure of the PTP sheet by calculating data. 6. The PTP according to claim 1, wherein:
The PTP seal according to any one of the seal inspection devices, wherein the first camera and the second camera are cameras that selectively capture only infrared light among reflected light reflected from the PTP sheet. Inspection equipment.