JPH06103365A - Method and device for display of defective image color - Google Patents

Abstract

PURPOSE:To surely display the detected defect in a color as a still picture without impairing the defect detecting accuracy. CONSTITUTION:Sensor cameras 3a-3d contain a 1st sensor 22 for detecting defect which consists of a lens 21 and a CCD monochromatic linear image sensor set together by the image forming position of the lens 21 and a 2nd sensor 23 for displaying defect which consists of a CCD color linear image sensor are used to photograph a printed matter 1 which is moved under the same illumination in its width direction, and a 1st output signal sent from the sensor 22 is processed by a defect detector means 7 to detect the presence or absence of a defect. At the same time, the 2nd output signal received from the sensor 23 is accumulated by a defective image color display means 8 to generate the screen image color data. Then, the screen image color data including the defective color data corresponding to the defect are displayed on a monitor color TV 16 as a still picture based on the detected defect.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a defect detected on a test material such as a gravure printed material or an offset printed material having an inspection surface color printed, for example, as a still image on a monitor color television screen. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a defect image color display method and apparatus for displaying the defect image.

[0002]

2. Description of the Related Art In order to know the type and shape of a detected defect, it is effective to display the defect as a still image on a monitor television in order to realize an early countermeasure against the defect. As a display method therefor, the present applicant installs an image display camera downstream from the installation location of the defect detection device in the flow direction of the material to be inspected, and detects the detection signal based on the line speed by the defect detection signal of the defect detection device. A method of shifting, picking up an image of the defective portion with the display camera, and displaying the image as a still image on a monitor TV was previously developed.

More specifically, a moving test material is illuminated at an inspection position, and a CCD (Charge Coupled D) is illuminated under this illumination.
evice) A sensor camera for detecting defects, which uses a monochrome linear image sensor as a light receiving unit, and images the moving test material over the entire width direction. Then, the image signal from the camera is subjected to pattern matching processing to determine the quality of the material to be inspected, and when there is a defect in this determination, at which position in the width direction of the material to be inspected the defect is To measure. Next, at the defect monitoring position defined on the downstream side in the moving direction of the test material with respect to the inspection position where the camera is arranged, a monitoring color television camera movably provided in the width direction of the test material is provided. Based on the defect position information, the defect is moved to a predetermined position where the defect will pass. Then, when the defect passes through the predetermined position, the area including the defect is imaged by the television camera under the light emission of the strobe light emitter. Finally, the video signal from the television camera is displayed on the screen of the monitor television as a color still image.

In addition to the above, the present applicant previously developed the following defect image display method. In this method, first, the moved test material is illuminated at the inspection position, and CC is illuminated under this illumination.
A sensor camera for detection using a D monochrome linear image sensor as a light receiving unit captures an image of a moving test material over its entire width direction. Next, the output signal of this camera is input to the defect detection device and the defect image display device, respectively, and the presence or absence of the defect is detected by the pattern matching processing in the defect detection device, and at the same time, the output signal is accumulated by the defect image display device. Then, the surface image data is formed. Then, when the defect detection device detects a defect, the plane image data formed on the defect image display device including the defect data corresponding to the defect based on the position information of the defect is output to the monitor television, A still image is displayed on this TV screen. Therefore, when a defect is detected based on the information from the same sensor camera, an image including the defect can be displayed as a still image on the monitor television.

[0005]

However, in the former method of displaying a defect image, the defect detection sensor camera captures an image of the defect under illumination in which the position, the wavelength, etc. are taken into consideration so that the defect is conspicuous. However, the image pickup of the surveillance color television camera is performed under the strobe light emission different from the illumination. In strobe light emission, position and wavelength are not taken into consideration so that defects are prominent like defect detection, and the resolution (resolution) of the monitoring color television camera is inferior to that of the defect detection sensor camera. Therefore, even if a defect is contained in the visual field of the surveillance color television camera, the defect may not be clearly captured.

Moreover, since the surveillance color television camera has a low resolution, it is practically impossible to clearly display a small defect on the television screen. Therefore, the color television camera has a zoom-up function. By enlarging and capturing the image, it is possible to see even a small defect.

However, since the color television camera for monitoring needs time to move corresponding to the defect position, the distance between the inspection position and the monitoring position must be increased as the moving speed of the material to be inspected becomes faster. In addition, the amount of expansion and contraction of the test material differs between these two positions. Therefore, if the zoom-in function that reduces the angle of view is added,
It may be difficult to bring the detected defect into the visual field of the surveillance color television camera, which may cause a display error.

In the latter defect image display method,
Since the defect image display device processes the signal output from the CCD monochrome linear image sensor, the defect is displayed as a still image in monochrome. Therefore, there is a problem that the defect cannot be displayed in color and the condition of the defect cannot be accurately monitored.

By the way, this display problem can be solved by using a CCD color linear image sensor as the light receiving portion of the sensor camera, but there arises a problem that the defect detection accuracy is impaired. That is, the conventional CCD color linear image sensor has a color filter formed on-chip in its photosensitive pixel row, and its red (R), green (G),
The blue (B) primary color filter is
The photosensitive pixel rows are arranged in parallel in the column direction, and the RGB color filters cover a region of 1/3 of one pixel. Then, in order to simplify the circuit processing in the defect detection device, the pattern matching processing may be performed using the signal charges generated by the light incident through the color filters of the same color.

Therefore, for example, if the signal charge of the pixel portion covered with the red color filter is used, the detection information (signal charge) of the portion corresponding to the green and blue color filters is canceled. Therefore, the actual resolution of the surface to be inspected, which is handled by one pixel, is reduced to 1/3 of the resolution of one pixel of the CCD monochrome image sensor, and accordingly the detection accuracy of the defect detection by the defect detection device is reduced. I will end up.

An object of the present invention is to provide a defect image color display method and apparatus capable of surely displaying the detected defect as a still image in color without impairing the defect detection accuracy.

[0012]

In order to achieve the above object, the defect image color display method according to claim 1 illuminates a material to be moved to be inspected at an inspection position, and a lens and an image forming position of this lens. A sensor camera having a first sensor for detecting defects, which is composed of a CCD monochrome linear image sensor, and a second sensor for displaying defects, which is composed of a CCD color linear image sensor, which are arranged in parallel with each other. The inspection material is imaged in the width direction, the first output signal from the first sensor is input to the defect detecting means, and the reference pattern stored in the defect detecting means is compared with the first output signal. At the same time as performing pattern matching processing to detect the presence or absence of a defect, the second output signal from the second sensor is input to the defect image color display means, and the second output is performed by this display means. Area data to form surface image color data, and based on the defect detection of the defect detecting means, surface image color data formed in the defect image color display means including defect color data corresponding to the detected defect. Is displayed on a monitor color television as a still image.

In order to achieve the same object, in the defect image color display apparatus of claim 2, the moving object to be inspected is placed at an inspection position where the illuminating means illuminates the object to be inspected. A lens, a first sensor for detecting a defect, which is composed of a CCD monochrome linear image sensor and a second sensor for displaying a defect, which is composed of a CCD color linear image sensor and which are installed to face each other And a sensor camera for imaging the material under test in the width direction thereof under illumination, a reference pattern relating to a non-defective product is stored, and a first output signal from the first sensor is input, Defect detecting means for performing pattern matching processing for comparing the first output signal with the reference pattern to detect the presence / absence of a defect; The second output signal from the two sensors is inputted, and the defect image color display means for accumulating the second output signal to form the surface image color data and the surface image color data formed by the defect image color display means A monitor color television for displaying a still image of the surface image color data formed on the defect image color display means, which includes defect color data corresponding to the detected defect, which is input based on the defect detection of the defect detection means. It is equipped.

Further, in order to simplify the structure of the sensor camera and improve the accuracy of color display of defects, the second sensor includes a first photosensitive pixel row covered with a red primary color filter. Second covered with blue primary color filter
Of the photosensitive pixel column and the third photosensitive pixel column covered with the green primary color filter, at least the first and second photosensitive pixel columns are provided, and these are arranged adjacent to each other in parallel. In addition, the first sensor is arranged in parallel adjacent to the second sensor, and the size of each pixel of the photosensitive pixel row of the first sensor and each pixel of each photosensitive pixel row of the second sensor are The pixels of the same size are arranged, and the pixels of each of the pixel columns are arranged side by side in a direction orthogonal to the column direction of each of the photosensitive pixel columns, and the first sensor and the second sensor are integrated. It is advisable to configure the sensor assembly as a combined sensor.

[0015]

In the structure of the present invention, the CCD of the sensor camera
The monochrome linear image sensor obtains detection information for defect detection by imaging the material to be inspected in the width direction under illumination at the inspection position illuminated by the illumination means. This detection information is the entire signal charge photoelectrically converted / accumulated in each pixel of the photosensitive pixel array of the sensor, and is input to the defect detecting means as the first output signal by reading the signal charge.

At the same time, the CCD color linear image sensor of the sensor camera obtains detection information for defect display by imaging the material to be inspected in the width direction under illumination by the illumination means. This detection information is a signal charge photoelectrically converted and accumulated in each pixel of the photosensitive pixel array of the color linear image sensor, and is read out and input to the defect image color display means as a second output signal.

The illuminating means is such that the position, wavelength, etc. with respect to the material to be inspected are taken into consideration so as to highlight the drawbacks.
Under the illumination of the inspection position by the one illumination means, the first and second sensors arranged side by side at the image forming position in the same sensor camera simultaneously image the material to be inspected. Due to the defect display, the lighting conditions can be the same.

The defect detecting means to which the first output signal is input compares the first output signal input to this with the reference pattern to detect whether or not there is a defect. Since the first output signal used for this detection is the entire signal charge photoelectrically converted and accumulated in each pixel of the photosensitive pixel row of the first sensor including the CCD monochrome linear image sensor, the resolution is lowered unlike the color signal. Never.

The defect image color display means to which the second output signal is input accumulates the second output signal to form the surface image color data, and when the defect detecting means detects the defect, this defect is detected. The surface image color data formed including the corresponding defect color data is input to the monitor color television. This color television displays the input surface image color data as a still image in color on the screen. Further, although the resolution of the defect due to the second output signal of the second sensor, which is a color signal, is lowered, this signal does not affect the defect detection and is displayed in color as a defect image. The condition can be easily monitored.

According to the third aspect of the invention, the CCD
Since the first sensor for detecting a defect, which is a monochrome linear image sensor, and the second sensor for displaying a defect, which is a CCD color linear image sensor, can have the same resolution, the accuracy of color display of the defect can be improved. Moreover, the first sensor and the second sensor, which are arranged in parallel at the image forming position in the same sensor camera, are integrated to form a sensor assembly,
The number of sensor camera components can be reduced.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a block diagram showing the system configuration of a defect image color display apparatus according to the first embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a continuous long printed material (test material) that has been subjected to, for example, gravure printing, and this is moved in the front-back direction on the paper surface on which FIG. 1 is drawn. A camera unit 2 is provided at an inspection position arbitrarily determined with respect to the moving line of the printed matter 1. The unit 2 includes, for example, four sensor cameras 3a to 3d, which are arranged so as to face the printing surface (inspection surface) of the printed material 1.

In FIG. 1, reference numeral 4 is a pulse generator which is provided with a detecting portion in contact with an edge portion of the printed material 1 to be moved or a rotating portion of a mechanism for moving the printed material 1, which is the position of the printed material 1. It is used to detect information.

At the inspection position, there is a first surface facing the printing surface.
The illuminating device 5 and the second illuminating device 6 facing the back surface of the printed matter 1 are arranged respectively. These lighting devices 5 and 6 are
Either one or both of them are used at the same time depending on the material of the printed matter 1 to illuminate the field of view of the sensor cameras 3a to 3d and to emit light having a wavelength necessary for highlighting a defect in the illumination from a specific direction. Irradiate 1.

Each of the sensor cameras 3a and 3b has the same structure, and the print surface is imaged (scanned) over the entire width of the printed material 1 by these sensors. The sensor cameras 3a-3b are formed as shown in FIGS.

That is, each of the sensor cameras 3a to 3b has a lens 21 (in the drawing, one convex lens is shown as a representative, but in reality, a plurality of lenses are combined together).
And the first and second sensors 22 and 23. The first and second sensors 22 and 23 are arranged in parallel at the image forming position of the lens 21. Note that f in FIGS. 4 and 6 is the focal length, and 24 in FIGS. 4 and 5 has a focal length f of 3
An image forming area of the lens 21 of 5 mm, and an area 25 of 36 mm in length and width in this area 24 indicates an image forming area used for photography, and 36 mm × 24 in this area.
Area 26, shown in mm, represents the effective imaging area for 35 mm photographic film.

The first sensor 22 is a CCD monochrome image sensor for detecting defects, and in the effective image forming area 26, for example, the optical axis 21a of the lens 21.
The printed matter 1 is arranged so as to extend in the width direction of the printed matter 1. The configuration of the photosensitive pixel array 27 included in the first sensor 22 is shown in FIG.
Is shown in. The photosensitive pixel array 27 has a function of converting the energy of light incident on the photosensitive pixel array 27 into an electric signal by photoelectric conversion and temporarily accumulating the obtained signal charge, and the photosensitive pixel row 27 is arranged in series. The size of each pixel 27a is, for example, 14 μm in length and width.

The second sensor 23, which is a CCD color image sensor for displaying defects, is parallel to the first sensor 22 in the effective image forming area 26, for example, slightly displaced from the optical axis 21a of the lens 21. It is arranged.
A color filter is formed on-chip in the photosensitive pixel array 28 included in the second sensor 23, and its configuration is shown in FIG. That is, each pixel 28 of the photosensitive pixel row 28
In a, primary color filters of red (R), green (G), and blue (B) are arranged in parallel in the column direction of the photosensitive pixel column 28, and each of these RGB color filters is one pixel. It covers the 1/3 area of 28a. Each pixel 28a of the second sensor 23 has a size of, for example, 14 μm in length and 21 μm in width. Therefore, each of the RGB color filters has a length of 1 μm.
It has a size of 4 μm and a width of 7 μm.

Therefore, the second sensor 23 is the first sensor 2
It is formed to be ⅓ longer than 2, and as shown in FIG. 5, one end is arranged to protrude from the image formation region 25.
Among the signal charges accumulated in the photosensitive pixel row 28 of the second sensor 23, a pixel group at a position corresponding to the length L (see FIG. 5) of the photosensitive pixel row 27 of the first sensor 22 is set as an effective pixel. Only the signal charge read out from is used as an output signal.

The first output signal read from the first sensor 22 as a voltage signal by the pixel reading function of each of the television cameras 3a to 3d is input to the defect detecting means 7 shown in FIG. At the same time, the second output signal read from the second sensor 23 as a voltage signal by the pixel reading function of each of the television cameras 3a to 3d is input to the defect image color display means 8 shown in FIG.

The defect detecting means 7 is, for example, a contour extracting circuit,
A first defect recognition unit, a first defect determination circuit, a second defect recognition unit,
A second defect determination circuit is provided to process an input signal and detect whether or not there is a defect by pattern matching.

That is, by inputting the first output signals from the sensor cameras 3a to 3d for the printed matter judged to be non-defective products to the defect detection means 7, the contour extraction circuit extracts the contour pattern for the non-defective products, and the contour pattern is extracted. The pattern is input to the first and second defect recognition units. The first defect recognizing unit stores the input as a master contour pattern (first reference pattern) in the memory, and the second defect recognizing unit stores the allowable value in the contour pattern input to the second defect recognizing unit. The master enlargement pattern (second reference pattern) obtained by performing the enlargement process marked with is stored in the memory.

After storing such a reference pattern, the sensor cameras 3a to 3d for the printed matter 1 as the material to be inspected.
The first output signal from the is supplied to both defect recognizers. Then, the first defect recognition section compares and collates the master contour pattern stored in the memory with the inspection pattern obtained by enlarging the contour pattern of the printed matter 1. By this pattern matching process, the inspection pattern of the printed matter 1
If there is a defect of so-called chipping property such as a part of the print being missing or blurring, a part of the master contour pattern sticks out against the inspection pattern of the enlarged test material. Recognize the exposed portion as defective defect information. This defect information is input to the first defect judgment circuit to judge whether or not it is a defect.

Further, the second defect recognizing section compares and collates the first output signal inputted thereto with the master enlargement pattern stored in the memory as it is without enlarging it. By this pattern matching processing, when the inspection pattern of the printed matter 1 has a so-called flying defect that is caused by a defect such as scattered ing or stains attached to a place other than a predetermined printing spot, On the other hand, since a part of the inspection pattern of the printed matter 1 is exposed, this exposed portion is recognized as defect information of flying property. This defect information is input to the second defect judgment circuit to judge whether or not it is a defect.

The structure of the defect image color display means 8 to which the second output signals from the sensor cameras 3a to 3d are supplied in parallel with the input of the first output signal to the defect detecting means 7 is shown in FIG. It is shown. Reference numeral 11 in FIG. 2 is, for example, a switch for switching an analog signal, and the second output signal from each of the sensor cameras 3a to 3d is A through this switch 11.
The multi-valued digital outputs that are individually input to the A / D converters 12a to 12d and further output from the A / D converters 12a to 12d are image memories 13a provided corresponding to the respective sensor cameras 3a to 3d. To 13d are input separately. The output ends of the respective image memories 13a to 13d are connected to the display memory buffer 15 via the bus line 14, and the monitor color television 16 is connected to the output end of the buffer 15.

The switch 11 is a sensor camera 3a to 3d.
The second output signal (color signal) from the A / D converter 12a is normally supplied to the corresponding image memories 13a to 13d.
˜12d, but when one camera picks up a defect, it is switched so that the second output signal including the defect is input to another image memory via the A / D converter. Is.

The switching is performed by the defect detection signal from the defect detection means 7 and the PG from the pulse generator 4.
This is performed by the timing controller 17 to which signals (positional information) and the like are input. In this case, the switching is performed by applying a predetermined delay (delay) from the input of the defect detection signal. In this embodiment, for example, an adjacent image memory is used as the other image memory.

Therefore, the other image memory for the sensor camera 3a corresponding to the image memory 13a is the image memory 13b, and the other image memory for the sensor camera 3b corresponding to the image memory 13b is the image memory 13c.
And the sensor camera 3c corresponding to the image memory 13c
The other image memory for is the image memory 13d,
The other image memory for the sensor camera 3d corresponding to the image memory 13da is the image memory 13a. In addition,
Each of the sensor cameras 3a to 3d is stored in the other image memory.
A dedicated memory may be prepared in addition to the image memory corresponding to the above.

As the image memories 13a to 13d, those having a storage capacity equivalent to half the storage capacity of the display buffer memory 15 are used. In this case, the storage capacity of the display buffer memory 15 is 512 KB which is the same as the number of scanning lines of the monitor color television 16 which displays the surface image color data.
Since it is (kilobytes), each image memory 13a ...
The storage capacity of 13d is 256 KB. Moreover, in the present embodiment, the image memories 13a to 13d are not independent of each other, but a one-chip memory having a capacity of 1 MB (megabyte) is allocated to four, and the allocated portions are respectively image memories 13a to 13d. Used as. Therefore, in the present embodiment, although it is a one-chip image memory, it is possible to record surface image color data for up to two screens including defects.

The image memories 13a to 13d store the second output signals output from the sensor cameras 3a to 3d and A / D converted while scrolling unless a defect is detected. When a defect is detected, the second output signal is stored after the delay. Writing of the second output signal is stopped. Further, the surface image color data including the defect color data corresponding to the defect accumulated in each of the image memories 13a to 13d is transferred to the display buffer memory 15 through the bus line 14 at the moment when the writing is stopped.

The display buffer memory 15 synthesizes two surface image color data corresponding to half screens successively transferred from the two image memories to form synthesized image color data corresponding to one screen. Perform processing. And
The composite image color data is held in the display buffer memory 15 unless a reset command is given, and the surface image color data is transferred from any of the image memories 13a to 13d, whereby the previous composite image color data is transferred. Will be canceled. Further, if necessary, a window command can be applied to the display buffer memory 15, and by this command, a central portion (a range surrounded by a dotted line in FIG. 3) including a defect of the composite image color data can be cut out. The window designation is given in advance at the time of initial setting.

The monitor color television 16 to which the output of the display buffer memory 15 is input displays the composite image color data as a still image on its screen, and, of course, is installed in the operator room and has a drawback. The operator is monitored based on the notification of the alarm that is issued at the same time as the detection of.

In the above-mentioned structure, the plurality of sensor cameras 3a to 3d are under the illumination of at least one of the illumination devices 5 and 6 at the inspection position, and the printed matter 1 as the material to be inspected.
The printing surface of is imaged over the entire width direction. The first output signals from the respective sensor cameras 3a to 3 obtained by this image pickup are input to the defect detecting means 7 and are used for the defect detection by the pattern matching process. At the same time, since the second output signals from the sensor cameras 3a to 3 are input to the defect image color display means 8, the second output signals are sent to the cameras 3a to 3a.
Image memories 13a to 13 provided respectively corresponding to 3d.
After being A / D converted to d, they are respectively input to form surface image color data. And when a defect is detected,
The plane image color data including the defect color data corresponding to this defect is displayed in color on the color television camera 16 as a still image.

In the defect detection, the defect detection detection information input to the defect detection means 7 is the first output signal from the first sensor 22 of the sensor cameras 3a to 3d. Since it is formed by the CCD monochrome linear image sensor, the first output signal is the entire signal charge photoelectrically converted and accumulated in each pixel 27a of the photosensitive pixel row 27 shown in FIG. That is, FIG.
The detection field A of the surface to be inspected corresponding to one pixel 27a shown in FIG.
The signal charge proportional to the amount of incident light from can be output as 100% as the first output signal, and there is no cancellation.

Therefore, although the defect can be displayed as a still image in color, the defect detection accuracy of the defect detection means 7 for pattern matching the first output signal does not decrease, and the defect can be detected reliably. it can.

Since the same illumination devices 5 and 6 and the sensor cameras 3a to 3d are used for the defect detection and the color display of the defect image which will be described in detail below, the defects are emphasized and monitored. Therefore, there is no inconsistency in the illumination optical system. Therefore, in the defect image color display, the defect is not clearly displayed on the screen of the color television camera 16. Furthermore, since the defect inspection position and the monitoring position are the same by sharing the illumination means 5 and 6 for defect detection and defect display, even if the printed matter 1 extends in the moving direction, it is not affected.

Therefore, for these reasons, the display error of the defect can be prevented, and the state of the defect can be accurately monitored by the color display. Based on this monitoring, it is possible to properly adjust the printing early for the gravure printing machine having a relationship with the defect.

Next, details of the defect image color display will be described with reference to FIG. Note that, in FIG. 3, for convenience of explanation, a sensor camera 3a, an image memory 13a corresponding thereto, another image memory 13b adjacent thereto, a bus line 14, a display buffer memory 15, and a monitor television 16 are provided. Only are shown representatively and will be described in this range.

By inputting the second output signal from the sensor camera 3a, the image memory 13a scroll-stores the digitized second output signal from the camera 3a. This storage corresponds to half the storage capacity of the display buffer memory 15. Then, when the camera 3a images the defect and the defect detecting means 7 detects the defect, the switch 11 is switched by the timing controller 17, so that the scroll operation is stopped after a delay of a certain time. Then, at the time of this write stop,
The surface image color data stored in the image memory 13a includes defect color data corresponding to half E1 of the detected defects.

Immediately after this writing is stopped, the image memory 1
The plane image color data including the defect E1 accumulated in 3a is transferred to the display buffer memory via the bus line 14 while rearranging in time series. During the transfer, the second output signal continuously output from the sensor camera 3a that has detected the defect is input to the adjacent image memory 13b by switching the switch 11 and scroll-stored.

When storage corresponding to half the storage capacity of the display buffer memory 15 is stored in the image memory 13b, the switch 11 is switched back to the original state at that time and the surface stored in the image memory 13b is restored. The image color data is transferred to the buffer memory 15 via the bus line 14 while being rearranged in time series. The surface image color data transferred from the image memory 13b includes defect color data corresponding to the remaining half E2 of the detected defects.

Then, the display buffer memory 15
Combines (rearranges) the surface image color data previously transferred from the image memory 13a with the surface image color data transferred subsequently from the image memory 13b. In this composite image, since half of the defects E1 and E2 form the shape of the original defect E that is detected by overlapping, this defect position is always arranged at the substantially central position of the composite image.

Then, the display buffer memory 15 causes the monitor color television 16 to display the composite image as a still image. As a result, the image of the defect E can be displayed at a height position which is 1/2 the vertical direction of the screen of the monitor color television 16.

Since the display position of the defect E thus detected on the monitor color television 16 screen can be stabilized, it is not necessary for the operator to search for the defect E on the monitor screen. The visibility of defects on 16 screens can be improved.

In this color display, the second color sensor 23 having the photosensitive pixel array 28 as shown in FIG.
Is used, each pixel 28 of the second sensor 23 is based on the size (width 7 μm) of the color filters of the three RGB.
The resolution of a is [(3 × 7) μm / 1 pixel. ] Is reduced to about 67% of the resolution [14 μm / 1 pixel] of each pixel 27a of the first sensor 22.

However, the second output signal from the second sensor 23 is not used for detecting a defect requiring high accuracy, but is used for displaying the detected defect in color. When the operator visually recognizes the defect image on the monitor color television 16, there is no problem in practice in spite of the decrease in the resolution, and the state of the defect detected by the color display can be easily monitored. . The first and second sensors 2 of this embodiment
In the configurations Nos. 2 and 23, there is a displacement of about 30% between the detected defect and the displayed defect position, which corresponds to the difference in resolution. Even with respect to such a displacement, the operator monitors the color television 16 However, it does not significantly impair the visibility of the color image, which is a drawback of the above method, and has no problem in practical use.

Further, in the defect detection image color display system having the above-described structure, as described above, the sensor cameras 3a ...
Since the second output signal from 3d is processed by the image memories 13a to 13d, the display memory buffer 15, etc., and the defect is displayed in color on the screen of the monitor color television 16,
In addition to the sensor cameras 3a to 3d, a monitoring color television camera and a moving mechanism therefor, which are conventionally required, can be eliminated, and the illuminating means 5 and 6 can be halved.

Therefore, the entire structure of the defect detection image color display system can be simplified, and the mechanical components of the defect detection image color display system are provided only at the inspection position, and need not be provided at other places. Therefore, the space factor can be improved accordingly, which is advantageous in installing the system in the inspection line.

Since it is not necessary to move the camera in the width direction of the printed matter in order to display the defect, the camera cannot be moved in time even when the defects are continuously detected such as when the defects are close to each other. It is possible to prevent the occurrence of display errors due to defects on the monitor screen, and it is also possible to easily deal with higher inspection line speeds.

9 and 10 show a second embodiment of the present invention. The configuration of this embodiment is the same as that of the first embodiment including the not-shown portion except that the position of the second sensor 23 is changed by using the spectroscope 31 for the sensor cameras 3a to 3d. Only parts different from the first embodiment will be described.

A half mirror is used for the spectroscope 31,
It is arranged between the lens 21 and the first sensor 22 at an angle of 45 ° with respect to the optical axis of the lens 21. In addition, instead of the half mirror, a prism is used for the spectroscope 3.
It may be used as 1. The second sensor 23 is provided so as to face the oblique spectral surface 31a of the spectroscope 31. Therefore, as shown in FIG. 10, the first sensor 22 and the second sensor 23 are arranged side by side, and the second sensor 23 is arranged outside the image forming area 24 of the lens 21 in this embodiment. Of course, the second sensor 23 is arranged at the image forming position of the lens 21 via the spectroscope 31.

Sensor cameras 3a to 3d having such a configuration
Also in the second embodiment using, the intended object of the present invention can be achieved by the same operation as in the first embodiment. Moreover, according to this embodiment, the position of the defect detection and the position of the defect display can be aligned with the portion where the optical axis 21a of the lens 21 intersects with the printed matter 1. The performance of color display can be improved.

11 and 12 show a third embodiment of the present invention. In this embodiment, the sensor cameras 3a to 3d are used.
The configuration other than the point that the first and second sensors 22 and 23 are integrated into a sensor assembly 45 is the same as that of the first embodiment including a portion not shown. Only different parts will be described.

The second sensor 23, which is a CCD color linear image sensor, has a first photosensitive pixel row 41 covered with a red primary color filter and a second photosensitive pixel row 42 covered with a blue primary color filter. , And the third photosensitive pixel row 43 covered with a green color filter is arranged in parallel with each other.

The photosensitive pixel array 27 of the first sensor 22 composed of a CCD monochrome linear image sensor is the second sensor 23.
Are installed next to each other. Both of these sensors 22, 23
Pixels 27a, 41 of each photosensitive pixel row 27, 41-43
The sizes of a to 43a are the same, for example, 14 μm in each length and width. Therefore, as shown in FIG. 12, the pixels of the adjacent photosensitive pixel columns are arranged side by side in the direction orthogonal to the column direction. In this way, the first sensor 22 and the second sensor 23 form an integrated sensor assembly 45.

This sensor assembly 45 is arranged at the image forming position of the lens 21 as shown in FIG. 11A, and within the effective image forming area 26 of the lens 21 as shown in FIG. 11B. In, the lens 21 is arranged so as to extend in the width direction of the printed matter 1 through the optical axis 21a of the lens 21.

Therefore, such a sensor assembly 45
Since the printing surface of the printed matter 1 is scanned over the entire width direction by the built-in 3a to 3b, the intended object of the present invention can be achieved by the same operation as in the first embodiment. In addition, according to this embodiment, the position of the defect detection and the position of the defect display can be made substantially coincident with the portion where the optical axis 21a of the lens 21 intersects with the printed material 1, so that the second sensor 2
Since the resolution of 3 matches the resolution of the first sensor 22,
The accuracy of color display of the detected defect on the monitor color television 16 can be improved. Furthermore, since the first and second sensors 22 and 23 are integrated, the number of parts forming each of the sensor cameras 3a to 3d can be reduced.

In the third embodiment, the second sensor 23 may be formed by arranging the first and second photosensitive pixel rows 41 and 42 adjacent to each other and in parallel. In the case of carrying out in this way, after producing the output signal relating to the green component based on the second output signals read from these pixel columns 41 and 42, these signals are processed by the defect image color display means. Then, the surface image color data may be formed and implemented.

[0068]

As described above in detail, according to the inventions described in claims 1 and 2, the illumination means for defect detection and defect display are shared, and the defect detection and the defect detected accordingly. Since color images are displayed, it is of course necessary for the illumination to have consistency. In addition to using a CCD monochrome linear image sensor for detecting defects, a CCD color image sensor for displaying defects is used to detect defects. It is possible to provide a defect image color display method and an apparatus thereof which can surely display the detected defect as a still image in color without impairing the defect detection accuracy in displaying the image in color.

According to the third aspect of the invention, it is possible to provide a defect image color display device capable of displaying a defect displayed in color with the same accuracy as the detection accuracy of this defect and simplifying the configuration of the sensor camera. .

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration according to a first embodiment of a defect detection image color display system for carrying out the method of the present invention.

FIG. 2 is a block diagram showing a circuit configuration of a defect image color display means according to the first embodiment.

FIG. 3 is a diagram illustrating a method of displaying a defect image on a monitor color television by the defect image color display unit according to the first embodiment.

FIG. 4 is a diagram showing a relationship between a main part of the sensor camera and a printed matter according to the first embodiment.

FIG. 5 is a diagram showing an arrangement of first and second sensors with respect to an image forming area of a lens in the sensor camera according to the first embodiment.

FIG. 6 is a diagram showing a relationship between a main part of the sensor camera according to the first embodiment and a printed matter as viewed from the arrow Z direction in FIG. 4;

FIG. 7 is a diagram showing a configuration of a photosensitive pixel row of the first sensor according to the first embodiment.

FIG. 8 is a diagram showing a configuration of a photosensitive pixel row of a second sensor according to the first embodiment.

FIG. 9 is a diagram showing a relationship between a main part of a sensor camera and a printed matter according to a second embodiment of the invention.

FIG. 10 is a diagram showing an arrangement of first and second sensors with respect to an image forming area of a lens in the sensor camera according to the second embodiment.

FIG. 11A is a diagram showing a relationship between a main part of a sensor camera according to a second embodiment of the present invention and a printed material. (B) is the second
FIG. 6 is a diagram showing the arrangement of first and second sensors with respect to the image forming area of the lens in the sensor camera according to the embodiment.

FIG. 12 is a diagram showing a configuration of a photosensitive pixel row of a sensor assembly according to a third embodiment of the invention.

[Explanation of symbols]

1 ... Printed material (test material), 3a to 3d ... Sensor camera,
5, 6 ... Illumination means, 7 ... Defect detection means, 8 ... Defect image color display means, 11 ... Switch, 12a-12d ... A /
D converter, 13a to 13d ... Image memory, 14 ... Bus line, 15 ... Display memory buffer, 16 ... Monitor TV, 17 ... Timing controller, 21 ... Lens, 2
2 ... 1st sensor, 23 ... 2nd sensor, 27, 28, 4
1, 42, 43 ... Photosensitive pixel rows, 27a, 28a, 41
a, 42a, 43a ... Pixels.

Claims (3)

[Claims] 1. A first defect detection device comprising a lens and a CCD monochromatic linear image sensor arranged in parallel at an image forming position of the lens for illuminating a test material to be moved.
A sensor camera having a sensor and a second sensor for displaying a defect including a CCD color linear image sensor is used to image the material to be tested in the width direction under the illumination, and the first sensor from the first sensor is used. The output signal is input to the defect detecting means, and a pattern matching process for detecting the presence or absence of a defect is performed by comparing the reference pattern stored in the defect detecting means with the first output signal. The second output signal from the defect image color display means, the display means accumulates the second output signal to form surface image color data, and the surface image color data is detected based on the defect detection by the defect detection means. The surface image color data including defect color data corresponding to the defect formed on the defect image color display means is displayed as a still image on a monitor color television. A disadvantage image color display method comprising. 2. A moving material to be inspected is installed at an inspection position where the illuminating means illuminates the material to be inspected, and the lens is provided in parallel with the imaging position of the lens. C
It has a first sensor for defect detection composed of a CD monochrome linear image sensor and a second sensor for defect display composed of a CCD color linear image sensor, and images the test material in its width direction under the illumination. A sensor camera and a reference pattern relating to a non-defective product are stored, and a first output signal from the first sensor is input.
Defect detecting means for performing a pattern matching process for detecting the presence or absence of a defect by comparing an output signal with the reference pattern, and a second output signal from the second sensor are inputted at the same time as the pattern matching process. Defect image color display means for accumulating output signals to form surface image color data, and surface image color data formed by the defect image color display means are inputted and detected based on the defect detection of the defect detection means. A defect image color display device comprising: a monitor color television for displaying a still image of the surface image color data formed on the defect image color display means including defect color data corresponding to the defect. 3. The defect image color display apparatus according to claim 2, wherein the second sensor includes a first photosensitive pixel row covered with a red primary color filter and a second photosensitive pixel row covered with a blue primary color filter. At least one of the two photosensitive pixel rows and the third photosensitive pixel row covered with the green primary color filter
A second photosensitive pixel row is provided, these are arranged adjacent to each other in parallel, the first sensor is arranged in parallel adjacent to the second sensor, and the first sensor is arranged in parallel. The size of each pixel of the photosensitive pixel row is the same as the size of each pixel of each photosensitive pixel row of the second sensor, and each pixel of each pixel row is orthogonal to the row direction of each photosensitive pixel row. A defect image color display device, which is arranged along a line and forms a sensor assembly in which the first sensor and the second sensor are integrated.