JPH04301753A - Picture image processing device - Google Patents

Abstract

PURPOSE:To carry out the inspection of a cylindrical body more accurately by dividing the picture image at the bottom surface of the cylindrical body into two parts to convert binary and then by deciding. CONSTITUTION:In a picture image of a turner 89a, an image at the bottom surface is divided into the shoulder part S and the central part C, and the corresponding images are stored in a memory 20a and a memory 20b respectively. In such a way, the images are stored by dividing into memories 20a to 20d, and 21a to 21d corresponding to photographed areas. The images of the shoulder part S and the central part C stored in the memories 20a and 20b are delivered to a video checker A 90, and in the video checker A 90, the images of the shoulder part S and the central part C are converted into binary depending on the separate standards respectively, and then they are decided.

Description

[Detailed description of the invention]

0001

[Industrial Field of Application] The present invention relates to an image processing device, particularly,
The present invention relates to an image processing device used in an inspection device that images the inner bottom surface of a cylindrical body and inspects its quality.

0002

[Prior Art] Conventionally, as a method of inspecting the inner bottom surface of a cylindrical body such as a laminate tube, especially the inner bottom surface having a concave portion, for defects such as scratches and dirt, human inspection was carried out by visual inspection. It was the Lord.

0003

[Problems to be Solved by the Invention] However, with this method, there is a limit to inspection efficiency, and even if other manufacturing processes for laminated tubes are automated and speeded up, this inspection process still limits the overall speed. There was a problem that complete automation could not be achieved. Furthermore, it has been a difficult problem whether there is an image processing device that can accurately inspect the inner bottom surface of such a cylindrical body.

An object of the present invention is to provide an image processing device that can image and inspect the inner bottom surface of a cylindrical body at high speed, automatically, and accurately.

[0005]

[Means for Solving the Problems] The present invention having the above objects includes an imaging means for imaging the inner surface of a cylindrical body having a bottom face at one end and a concave portion on the bottom face, and an image conveyed by the imaging means. The image processing apparatus includes a storage means for dividing an image into a plurality of parts and storing the image in order to process the divided images, and a determination means for binarizing the image stored by the storage means and making a determination based on the data.

[0006]

[Operation] According to the present invention having the above object, the inner surface of a cylindrical body having a bottom surface at one end and a concave portion on the bottom surface is imaged, and a plurality of images of the inner surface of the cylindrical body are captured. Divide and memorize. The divided and stored videos are individually binarized and judged using separate criteria. In other words, since the image of the concave portion normally becomes black, if the binarization level is increased for the concave portion, the other bright bottom portion becomes extremely bright, making it impossible to detect scratches or dust on the inner bottom surface. In order to prevent this, the inner bottom surface is divided into two parts, the shoulder part and the central concave part, and binarized according to the standards of each part, and the two parts are judged separately. Accurate judgment can be made and the inner bottom surface can be accurately inspected.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, preferred embodiments of the present invention will be described with reference to the drawings. This embodiment discloses an example in which the cylindrical body to be imaged or inspected according to the present invention is a laminate tube. Next, the configuration of a rotary tube inspection machine, which is an embodiment of the cylindrical internal body bottom surface inspection apparatus according to the present invention, will be described with reference to FIGS. 1, 2, and 9. This rotary tube inspection machine 2 includes a base 35, a motor 36, a rotating shaft 37, a rotating inspection table 12, a cam 46, a cam follower 47, and a holder lifting/lowering rotating shaft 4.
8, centering jig 38, and tube inner inspection device 3
9, a camera selector 43, a mixer 44, an antenna section 45, a rotary resolver 49, a fixed resolver 50,
It includes a light amount checker 51, a cam positioner 87, and a discrimination device 84. Here, the motor 36 and the rotating shaft 3
7 and the rotating inspection table 12 constitute a transfer means. The tube inspection device 39 constitutes an imaging means. Moreover, the above constitutes a cylindrical body bottom surface imaging device. Further, the antenna section 45 constitutes a signal transmitting/receiving means. The discriminating device 84 constitutes discriminating means.

A fixed shaft (not shown) is provided on the base 35, and a tubular rotating shaft 37 shares an axis with the fixed shaft and is provided so as to cover the fixed shaft. The rotating shaft 37 is configured to be rotationally driven by the motor 36. Further, a rotary resolver 49 and a fixed resolver 50 are provided to measure the angular positions of the fixed shaft and the rotating shaft. The rotating inspection table 12 is connected to a rotating shaft 37 and rotates as the rotating shaft 37 rotates. A holder H can be placed on the rotating inspection table 12. The holder H is lifted and lowered and rotated by a holder lifting and lowering rotation shaft 48. The vertical movement of the holder vertical rotation shaft 48 is performed by a cam 46 and a cam follower 47 provided at the lower end of the holder vertical rotation shaft 48 . The squeeze opening side of the laminate tube T can be fitted into the holder H. Additionally, a centering jig 38 holds the tail side of the laminate tube T in a circular shape.
is supported above the holder H. An intra-tube inspection device 39 for inspecting the inside of the laminate tube T includes an intra-tube insertion section 40, a borescope 41, and a CCD camera 42. The borescope 41 includes a borescope main body 52 and a borescope insertion section 53. The tube insertion section 40 is a borescope insertion section 53
, a light emitting diode section 54, a photosensor section 55,
Contains. Of these, the borescope insertion section 53 mainly inspects the inner bottom side of the laminate tube T in the diagram, that is, the squeezing opening side, and the light emitting diode section 54 and the photosensor section 55 mainly inspect the inner surface of the laminate tube T. 12 for rotary tube inspection machine 2
In-tube inspection devices 39 are provided, and 12 cam followers 47 and 12 holder lifting/lowering rotation shafts 48 are also provided. The number of these objects is not limited to 12 and may be any other number. Each tube inspection device 39 is connected to a camera selector 43 by a lead wire, and the camera selector 43 is connected to a mixer 44. Mixer 44 is connected to antenna section 45. The antenna section 45 is connected to the discrimination device 84.

Next, the operation of the rotary tube inspection machine 2 will be explained with reference to FIGS. 1 and 2. In Figure 1,
The laminate tube T is placed on a holder H and conveyed to the star foil 11 by a conveyor 9 or the like. The star foil 11 takes the laminate tube T together with the holder H onto the rotating inspection stand 12 of the rotary tube inspection machine 2. After being taken onto the rotating rotating inspection table 12,
The holder H rises in accordance with the cam curve of the cam 46 as the holder elevating and lowering rotation shaft 48 moves up and down, and performs intermittent rotational movement around the holder elevating and lowering rotating shaft 48 . That is, as shown in FIG. 2, the rotating inspection table 12 rotates on its own axis while revolving in the rotational direction, and at that time, P1 and P2 in the figure
, P3, and P4, the rotation is temporarily stopped for a predetermined period of time. As the holder H rises, the laminate tube T also rises, and the intra-tube insertion section 40 of the intra-tube inspection device 39 is inserted into the tube held in a circular shape by the centering jig 38. In this way, with the tube inner insertion part 40 inserted inside the tube, the laminate tube T rotates intermittently between points P1 and P4, and the inner tube inspection device 39 is used to inspect this section. The inner bottom surface and inner surface of the tube can be inspected. This intermittent rotational movement corresponds to relative plane movement between the cylindrical body and the imaging means. 1
When the inspection of the two tubes is completed, the defective laminate tubes T are discharged. In addition, before the tube insertion section 40 is inserted into the laminate tube T, the light amount of the light emitting section is checked by a light amount checker 51.
The results are reflected during data processing. Furthermore, if the light intensity is less than a reference value, an alarm can be issued and parts can be replaced.

Next, a more detailed configuration of the tube insertion portion will be explained based on FIG. 3. FIG. 3(A) shows the tube insertion part 4 inserted into the laminate tube T.
0 in the I-I direction. Also, Figure 3(C)
is a cross-sectional view in the II-II direction, and FIG. 3(D) is a cross-sectional view in the II-II direction.
FIG. 2 is a cross-sectional view in the II direction. The tube insertion part 40 is
A joining metal fitting 56 is attached to the light emitting diode portion 54 of the borescope 41 via a bolt 57.
A light emitting diode section 54 and photosensors 55a and 55b
, 55c, 55d, 55e, and 55f are attached.

A sectional view of the borescope insertion portion 53 is shown in FIG.
Shown in B). In the borescope insertion section 53, a lens section 60 for capturing an image is provided inside a stainless steel tube 58, and a light source fiber section 59 including a thin glass fiber is provided around the lens section 60. In the figure, the end surface S of the borescope insertion part 53 is perpendicular to the axis of the borescope insertion part 53, but it may be cut obliquely so as to have a certain angle with respect to the axis. In this case, the field of view is expanded not only vertically downward but also diagonally. Also,
The borescope insertion portion 53 is eccentric from the axis of the laminate tube T, and its positional relationship is shown in FIGS. 4(A) and 4(C). That is, in this case, the inspection possible area F1 of the borescope insertion part 53 is a quarter-circular part obtained by excluding the mask part (hatched part) from the square camera field of view. As shown in Fig. 2, the laminate tube T rotates intermittently at points P1, P2, P3, P
4, the inspection possible area F1 in FIG. 4C can be inspected when the point P1 is stopped, and the inspection possible area F2 can be inspected when the point P2 is stopped. Thereafter, in the same manner, the testable area F3 can be inspected when the point P3 is stopped, and the testable area F4 can be inspected when the point P4 is stopped. In this way, by dividing the inspection area as shown in FIGS. 4(A) and (C) and imaging and inspecting the inner bottom surface, as shown in FIGS. 4(B) and (D), Compared to installing the borescope insertion part 53 at the axis of the laminate tube T and inspecting it as one inspection area, the resolution can be further improved and defects such as finer contaminants and scratches can be detected. becomes. The division of the inspection area is not limited to four, and may be any other number.

On the other hand, the light emitting diode section 54 has a length that covers the inner bottom surface of the laminate tube T from the upper opening surface, and can illuminate the inner surface from the upper end to the lower end. Three photosensors 55a to 55f are provided on each side of the light emitting diode section 54, and are provided so that their inspection areas overlap as shown in FIG. 3(C). With this configuration, the photosensors 55a to 55f can be used during the period when the laminate tube T is rotating, that is, at points P1 and P in FIG.
The inner surface can be inspected during periods other than those stopped at 2, P3, and P4. Here, the photosensors 55a to 55f may be provided in one row, or may be other photoelectric conversion elements other than the photosensors, such as CCD elements.

Next, processing of inspection information detected by the tube inspection device 39 will be explained. The image information of the inner bottom surface of the laminate tube T detected by the CCD camera 42 is converted into a video signal, and the inspection information of the inner bottom surface of the laminate tube T detected by the photosensor section 55 is converted into an audio signal, and both are mixed. , is transmitted to the outside to determine whether or not it is defective. FIG. 9 is a block diagram showing the flow of image information processing of the inner bottom surface of the laminate tube T detected by the CCD camera 42. 9 is roughly divided into a rotating block 85 and a fixed block 86. The rotating block 85 has 12 CCD cameras 42a to 4.
2l and 12 CCD cameras for every 3 cameras
a VIDEO selector 43a that selects one of the three cameras divided into three groups and selects its image information;
43b, 43c, and 43d. The image information selected by the VIDEO selectors 43a, 43b, 43c, and 43d is converted by the RF converter, and the information is
Amplified by an amplifier. The signal amplified by the RF amplifier is passed through a band pass filter, and then passed through four VIs.
The signals selected from the DEO selectors 43a, 43b, 43c, and 43d are sent to a mixer 94 for mixing. The signal output from mixer 94 is sent to antenna unit 46 through BPF 95.

The fixed part includes a distributor 88 that distributes the received image information to the four tuners, and a distributor 88 that distributes the received image information to the four tuners.
A tuner 89a corresponding to the frequency converted by d
, 89b, 89c, 89d, and memory sections 20a, 20b, 20c, 20d, 21 that record images reproduced by the four tuners 89a, 89b, 89c, 89d.
a, 21b, 21c, and 21d.

Video image checkers 90A, 9 process the image data stored in these memory sections.
Sent to 0B. Video image checker 90A,
The data processed by 90B is outputted for judgment via an output amplifier. On the other hand, video image checker 90A
, 90B, and are amplified by signal amplifiers 92a, 92b.Then, the signals from the signal amplifiers 92a, 92b are sent to amplifiers 93a, 93b, 93c, 93d, respectively, to be transmitted to the rotating section. transmitted and amplified. After that, the amplifiers 93a, 93b
, 93c, 93d are mixed by mixers 94a, 94b, and the signals from B. P. It is sent to the rotating part by the antenna unit via F. The signal received by the antenna unit of the rotating section is distributed by the distributor 95 to two sets of receiving side AMPs. AMP96a, 96b, 96
The signals output from c and 96d are sent to buffers 97 and 98.
The images are distributed to the CCD cameras 42a to 42l via the CCD cameras 42a to 42l. This synchronization signal is transmitted from the CCD camera together with the image, and the image is identified by the synchronization signal.

Here, processing of the inspection information detected by the tube inspection device 39 will be explained. The image information of the inner bottom surface of the laminate tube T from each CCD camera 42a to 42l is obtained from the angular position of the rotating inspection table 12 detected by the rotating resolver 49 and the height position of the cam follower 47 detected by the cam positioner 87. The camera 43 specifies the camera to be taken in, selects and takes in only image information from that camera, and transmits it to the mixer 44. As is clear from FIG. 2, when a certain laminate tube T reaches point P4, the following laminate tubes T have already reached point P3, point P2, and point P1, so 4
Image information from two cameras is captured. mixer 44
B. mixes these four image information. P. F. 95
The signal is output to the transmitting antenna 96 via. Receiving antenna 7
The mixed image information received by the receiver 5 is divided into frequency bands by a distributor 88 and sent to each tuner 89a to 89h, where information signals are detected. Each tuner 89a-89
d, information signals from tuners 89a and 89b are sent to video image checker 90A. Further, information signals from tuners 89c and 89d are sent to video image checker 90B.

The image of the tuner 89a is divided into a shoulder part (FIG. 5(A)) and a central part (FIG. 5(B)), and the corresponding image, that is, the shoulder part, is stored in the memory part 20a.
(Fig. 5(A)), and the central part is the memory part 20b (Fig. 5(B)).
)) respectively. Similarly, the position in Figure 6
Memory section 2 corresponding to each area of the position in ■
It is stored separately into 0a to 20d and 21a to 21d. The images of the shoulder S and center C stored in 20a and 20b are sent to the video image checker A90A, and the video image checker A90A analyzes the images of the shoulder S and center C using different standards. Value. That is, since the center portion C is normally dark, the data is binarized using that data as a reference, and the shoulder portion S is brighter than the center portion C, so the data is binarized using the brightness as a reference. In this way, in order to binarize the shoulder part S and the center part C using different standards, the center part C is binarized by applying the criterion of the center part C, and the shoulder part S is binarized. There is no reduction in the accuracy of result judgment.

As a result of binarization using the video image checker A90A, it is OK if no scratches, dust, etc. are found.
Amplifier 9 outputs NG signals if they are detected.
1, and the amplified signal is output as a judgment output. Information signals from tuners 89c and 89d are sent to video image checker 90B and subjected to similar processing. The cam positioner 92 identifies the camera number from the detected angular position of the rotating inspection table 12 and the height position of the cam follower 47 detected by the cam positioner 92 and transmits it to the defect determination circuit 93. A selection signal is issued to the controller 90A or the controller 90B, and the defect judgment circuit 9 is selected from among the information signals from each tuner.
Select the signal to be sent to 3. The defect determination circuit 93 determines whether or not the image information signal from each camera is defective, and outputs the result to the outside. For example, the image information signal is binarized based on brightness and judged based on the number of pixels in the dark area.

FIG. 7 shows an example of the configuration of the antenna section 45.
Explain using. Here, the hatched portions indicate examples of fixed blocks. The antenna section 45 is a transmitting antenna 74
It has a receiving antenna 75, an electromagnetic shielding cover for electromagnetically shielding these, an electromagnetic shielding cover, mounting fittings 76 and 77 for each antenna, and lead wires 81 and 82 for supplying signals. The transmitting antenna 74 and the receiving antenna 75 are in a non-contact state and always face each other even when the rotating block rotates, allowing stable transmission and reception of information signals. Since it is shielded, it is not affected by external noise.

FIG. 8 is an operation timing chart of the camera and controller. By operating in this manner, the number of expensive controllers can be reduced and the small number of controllers can be operated efficiently. In addition, in the above embodiment, the laminate tube T is a cylindrical body with a tapered end at the bottom and an opening in a part of the tube, but this is similar to a bottle or can with one end closed. A cylindrical body with a bottom may also be used.

[0021]

[Effects of the Invention] As explained above, according to the present invention,
Since the inner bottom surface of the cylindrical body is divided into a plurality of images and image processed, images can be taken and inspected automatically and accurately at high speed, and the efficiency of the entire cylindrical body manufacturing line can be improved.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram of a tube inspection system using an image processing device of the present invention.

FIG. 2 is an explanatory diagram of the operation of the rotary tube inspection machine of the present invention.

FIG. 3 is a sectional view showing an intra-tube insertion portion inserted into a laminate tube.

FIG. 4 is an explanatory diagram illustrating the camera field of view of the tube insertion section.

FIG. 5 is an explanatory diagram showing image information processing of the inner bottom surface of the laminate tube detected by the CCD camera.

FIG. 6 is an explanatory diagram showing image information processing of the inner bottom surface of the laminate tube detected by the CCD camera.

FIG. 7 is a configuration diagram of an antenna section.

FIG. 8 is an operation timing chart of the camera and controller.

FIG. 9 is a block diagram of an image processing device of the present invention.

[Explanation of symbols]

1...Tube insertion part 2...Rotary tube inspection machine 3...Tube extraction part 4...Transport device 5...Emergency discharge conveyor 6... Accumulation conveyor 7...Pusher 8...Tube insertion jig

Claims (1)

[Claims] Claims: 1. Imaging means for taking an image of the inner surface of a cylindrical body having a bottom surface at one end and a concave portion on the bottom surface, and a plurality of images for dividing and processing the image taken by the imaging means An image processing device comprising: a storage means for dividing and storing images; and a determination means for binarizing the video stored by the storage means and making a determination based on the data.