JP2970663B1 - Printed matter contamination inspection device and inspection method - Google Patents

Abstract

An object of the present invention is to provide a printed matter contamination detection device and a detection method capable of responding to high-speed printing and capable of accurately and efficiently inspecting individual color components. SOLUTION: Regarding adjacent pictures of a printed matter in which a plurality of same pictures are printed vertically and horizontally, reflected light by illumination is detected in mutually different wavelength bands, and an output signal difference between the detected image information is calculated. The presence or absence of contamination is determined by comparing the input standard output signal difference.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and a method for inspecting contamination of a printed matter, in particular, a printed matter obtained by printing a plurality of identical pictures in multiple colors.

[0002]

2. Description of the Related Art In recent years, with the increase in printing speed and definition,
The demand for in-line inspection for contamination of printed matter is increasing. In particular, there is a need for an inspection method capable of coping with multicolor printing, and various devices and methods are being developed.

[0003] As a conventional multi-color printed matter contamination inspection method, a method of capturing an image of a printed matter by a camera, decomposing the image into three colors of red, green, and blue to determine the presence or absence of contamination for each color element. A method of rotating the three kinds of green and blue filters, capturing images obtained through the respective filters with a camera, and determining the presence or absence of contamination, respectively. The light sources of the three kinds of wavelength bands of red, green and blue are alternately blinked.
A method in which an image obtained by each light is captured by a camera and the presence or absence of contamination is determined. The transmittance of light of 400 to 500 nm is 500 to 700.
A method in which a filter having a transmittance larger than that of light of nm is arranged between the printed matter and the camera, and an image obtained through the filter is captured by the camera to determine the presence or absence of contamination (Japanese Patent Laid-Open No. 60-64851). No.) Reflected image obtained by illuminating printed matter with a white light source and 5
A method in which an image obtained through a filter that transmits light of 00 nm or more is captured by a camera, and the presence or absence of contamination is determined from the difference component between the image signals and the image from the white light source (Japanese Patent Laid-Open No. 4-305129). Etc. exist.

[0004]

However, each of the above methods has the following problems.

In the first method, the image information is
An optical system for decomposing the color, a circuit for separately processing them, and the like are required, and the apparatus is large and complicated, and the cost is high.

Further, the methods (1) and (2) reduce costs as compared with the method (2), but have a problem that they cannot sufficiently cope with high-speed printing due to time-division processing.

The method described above is excellent in that it is possible to inspect all colors while making the apparatus compact, but on the other hand, the detection accuracy of contamination for each color component is somewhat inferior. It was difficult to manufacture a filter that meets the conditions.

In the method (1), the method is improved to facilitate the manufacture of the filter, but the accuracy of detecting contamination of each color component is still insufficient.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an apparatus and a method for detecting contamination of a printed material which can respond to high-speed printing and can inspect the individual color components accurately and efficiently. .

In order to solve the above-mentioned problems, a printed matter contamination detecting apparatus according to the present invention comprises: an illuminating means for illuminating a printed matter on which a plurality of identical pictures are printed vertically and horizontally; Light detecting means for detecting reflected light from adjacent identical patterns in respective unique different wavelength bands to obtain image information, and the different wavelengths
Calculates signal difference components between image information detected in bands
The same method is used for the same picture without contamination in advance.
Before comparing with the standard signal difference component obtained by
An image information processing device for determining whether or not the printed matter is contaminated . This makes it possible to efficiently and reliably determine whether or not a specific color is contaminated by comparing the difference in image signal between adjacent pictures. In the image signal itself,
Use since only the image signal difference component is stored and compared.
Storage capacity of the information processing device that performs
It is advantageous in terms of.

Further, the printed matter contamination detecting apparatus according to the present invention is characterized in that the printed matter contamination detecting apparatus is provided with a scanning means as a light detecting means. This makes it possible to perform inspection by scanning a required portion or the entire surface of the target picture.

Further, the printed matter contamination detecting apparatus according to the present invention is characterized by comprising a plurality of light detecting means each having an optical system having unique and different optical characteristics. Thus, the reflected light is detected as image information in different wavelength bands by the respective light detecting means, and it is possible to efficiently and reliably determine whether or not a specific color is contaminated.

Further, the printed matter contamination detecting apparatus of the present invention is characterized in that it comprises a plurality of light detecting means each having a lens or a filter having unique and different optical characteristics. Thereby, the reflected light is detected as image information in different wavelength bands by the respective light detecting means, and it becomes possible to efficiently and reliably determine whether or not the specific color is contaminated.

Further, the printed matter contamination detecting apparatus of the present invention is characterized by comprising a plurality of light detecting means each having a lens and a filter having unique and different optical characteristics. Thereby, the reflected light is detected as image information in different wavelength bands by the respective light detecting means, and it becomes possible to efficiently and reliably determine whether or not the specific color is contaminated.

Further, the printed matter contamination detecting apparatus of the present invention is characterized in that it comprises a plurality of illuminating means for illuminating adjacent identical patterns with light of different wavelength bands.
As a result, the light reflected by each of the adjacent pictures is detected as image information in a different wavelength band, and it is possible to efficiently and reliably determine the presence or absence of contamination for a specific color.

Further, the printed matter contamination detecting apparatus according to the present invention is characterized in that it comprises a plurality of illuminating means each including a light source having a unique and different luminous sensitivity characteristic. As a result, the light reflected by each of the adjacent pictures is detected as image information in a different wavelength band, and it is possible to efficiently and reliably determine the presence or absence of contamination for a specific color.

Further, the printed matter contamination detecting apparatus of the present invention includes a plurality of illuminating means including a light source and a plurality of filters transmitting light in a specific wavelength band with respect to light emitted from each of the light sources, and It is characterized in that the wavelengths of the light transmitted by the filter are different from each other. As a result, the light reflected by each of the adjacent pictures is detected as image information in a different wavelength band, and it is possible to efficiently and reliably determine the presence or absence of contamination for a specific color.

Further, the printed matter contamination detecting apparatus according to the present invention is characterized in that it is provided with printed matter conveying means. As a result, it is possible to continuously perform high-speed inspection after printing as well as in-line inspection during printing.

Further, the printed matter contamination detecting apparatus according to the present invention is characterized in that the printed matter contamination detecting apparatus is provided with means for conveying the light detecting means between the pictures of the printed matter. This makes it possible to perform not only the in-line inspection at the time of printing but also the inspection after printing continuously and at high speed.

Further, the printed matter contamination detecting apparatus according to the present invention is characterized in that it is provided with a means for conveying an illuminating means between pictures of the printed matter. As a result, not only the in-line inspection at the time of printing but also the inspection after printing can be performed continuously and at a high speed, and the unevenness in illumination is reduced and the inspection accuracy is improved. Further, it is not necessary to illuminate the entire printed matter, and only the portion being scanned need be illuminated. Therefore, cost reduction effects such as reduction in power consumption can be obtained.

Further, the printed matter contamination detecting apparatus according to the present invention is characterized in that reflected light from adjacent same patterns is different from each other.
An image storage unit for storing each of the image information by detecting the wavelength band, a calculation circuit for calculating an output signal difference of the image information, obtained in advance from the same pattern with each other with no contamination
A threshold value storage unit to which the standard output signal difference has been input, and comparing the output signal difference with the standard output signal difference to determine the presence or absence of contamination, and to determine the presence of contamination if there is contamination. And a circuit. This makes it possible to efficiently and reliably determine contamination for a specific color. Also, not the image signal itself but the image signal difference component
Only the information processing device to be used is stored and compared.
The storage capacity may be small, which is advantageous in terms of cost.
In addition, if there is contamination, it can be announced
It becomes possible.

Further, the printed matter contamination detecting apparatus according to the present invention is characterized by comprising printed matter position information confirming means and address circuit controlling means for controlling image information processing based on the obtained position information. As a result, it is possible to accurately recognize the position of the picture pattern on the printed material and perform a more accurate inspection.

Further, in the printed matter contamination detection method according to the present invention, reflected light by illumination is reflected in different wavelength bands from each other in at least one of the same picture vertically and horizontally printed on the same picture. Detect and before
Image information detected in different wavelength bands
Find the signal difference components between each other,
Standard signal difference obtained by the same method for cats
The presence or absence of contamination is determined by comparing with components . This makes it possible to draw adjacent pictures
By comparing the image signal differences, it is possible to efficiently and reliably determine the presence or absence of contamination for a specific color. Also, only the image signal difference component, not the image signal itself
Is stored and compared.
The capacity may be small, which is advantageous in terms of cost.

Further, in the printed matter contamination detecting method of the present invention, at a position facing the picture on the printed matter, the light detecting means scans a part or the whole of the picture to detect reflected light by illumination.
It is characterized by detecting . This makes it possible to inspect a required portion of the target picture.

Further, in the printed matter contamination detecting method according to the present invention, the reflected light by illumination is applied to a picture which conveys a printed matter on which a plurality of identical pictures are printed vertically and horizontally and which is adjacent to the picture in a direction perpendicular to the conveying direction of the printed matter. Are continuously detected in different wavelength bands from each other, and
The signal difference component between the image information detected in
Use the same method for the same picture without contamination in advance.
By comparing with the standard signal difference component
The presence or absence of contamination is determined . As a result, it is possible to continuously perform high-speed inspection after printing as well as in-line inspection during printing.

Further, in the printed matter contamination detecting method of the present invention, the light detecting means is transported at a position facing the printed matter. As a result, it is possible to continuously perform high-speed inspection after printing as well as in-line inspection during printing.

Further, the printed matter contamination detecting method of the present invention is characterized in that the illuminating means is transported at a position facing the printed matter. This reduces illumination unevenness and improves inspection accuracy. In addition, it is not necessary to illuminate the entire printed matter, and it is sufficient to illuminate only the portion being scanned. Therefore, it is possible to obtain a cost reduction effect such as reduction in power consumption.

Further, the printed matter detection method according to the present invention is characterized in that, for adjacent pictures, reflected light due to illumination is detected by light detecting means comprising an optical system having unique and different optical characteristics. Thereby, the reflected light is detected as image information in different wavelength bands by the respective light detecting means, and it becomes possible to efficiently and reliably determine whether or not the specific color is contaminated.

Further, the printed matter contamination detecting method of the present invention is characterized in that the reflected light due to the illumination is respectively detected by light detecting means having a lens and / or a filter having unique and different optical characteristics. Thereby, the reflected light is detected as image information in different wavelength bands by the respective light detecting means, and it becomes possible to efficiently and reliably determine whether or not the specific color is contaminated.

Further, the printed matter contamination detecting method of the present invention is characterized in that adjacent identical patterns are illuminated with light of different wavelength bands. As a result, the light reflected by each of the adjacent pictures is detected as image information in a different wavelength band, and it is possible to efficiently and reliably determine the presence or absence of contamination for a specific color.

Further, the printed matter contamination detection method of the present invention is characterized in that adjacent identical patterns are illuminated by a plurality of illuminating means comprising light sources having mutually different luminous sensitivity characteristics. As a result, the light reflected by each of the adjacent pictures is detected as image information in a different wavelength band, and it is possible to efficiently and reliably determine the presence or absence of contamination for a specific color.

Further, the printed matter contamination detection method of the present invention uses a plurality of illuminating means comprising a light source and a filter which transmits only light in a specific wavelength band with respect to the light emitted from the light source, and uses a plurality of illuminating means for adjoining the same picture. Are respectively illuminated. As a result, the light reflected by each of the adjacent pictures is detected as image information in a different wavelength band, and it is possible to efficiently and reliably determine the presence or absence of contamination for a specific color.

Further, the printed material contamination detection method of the present invention, the same pattern Nitsu adjacent to at least an aspect or position direction
The reflected light from the illumination in different wavelength bands
Detecting and detecting in said different wavelength bands
The signal difference component between the image information
I asked for the same pattern by the same method
Compares with the standard signal difference component.
At some point, it is judged that there is contamination, and it is determined that contamination exists.
It is characterized by outputting . This makes it possible to efficiently and reliably determine contamination for a specific color. Ma
Also, not the image signal itself but only the image signal difference component
Storage capacity of the information processing device used
May be small, which is advantageous in terms of cost. further,
If there is contamination, it will be possible to announce its existence.
You.

The printed matter contamination detecting method according to the present invention is characterized in that the position of each picture on the printed matter is confirmed by the printed matter position information confirming means, and the image information is controlled by the address control circuit based on the position information. Features. As a result, it is possible to accurately recognize the position of the picture pattern on the printed material and perform a more accurate inspection.

In the present invention, printed matter of the same picture printed in the vertical and horizontal directions is illuminated, and reflected light of the picture adjacent in at least one of the vertical and horizontal directions is detected in mutually different wavelength bands. Each of the detected reflected lights is taken into the image processing apparatus as image information, and a signal difference component of the image information is calculated. This signal difference component is compared with a standard signal difference component that has been input in advance, that is, a signal difference component obtained from two pieces of the picture having no contamination, and the presence or absence of contamination is determined based on the magnitude of the difference between the two.

At this time, the comparison may be made only in one of the vertical and horizontal directions, but the inspection accuracy is further improved by comparing adjacent pictures in the other direction.
For example, image information in mutually different wavelength bands is detected for horizontally adjacent pictures, and image information is similarly detected for vertically adjacent pictures. Alternatively, image information in the same wavelength band may be detected in the vertical direction. In any case, a signal difference component of each image information is calculated, and a comparison with a standard signal difference component is performed. Determine the presence or absence of contamination. In this way, it is possible to compare pictures in two directions, and the inspection accuracy is improved, which is more desirable.

Further, if a printed matter position information confirming means such as an address control circuit is installed and the inspection is performed while grasping the accurate position of the printed matter, more accurate inspection can be performed.

In order to detect the reflected light, a light detecting means similar to the conventional one, that is, an image input device such as a CCD camera is used. Further, it is desirable that the light detecting means has a structure capable of scanning the image to be inspected individually. In this way, it is possible to perform an inspection according to the situation, such as a specific place on the pattern that requires inspection, or the entire surface of the pattern.

As a method of performing the above-mentioned "in different wavelength bands", there is a method of performing detection by light detecting means having optical characteristics different from each other. For example, each of the light detection means is provided with a lens or / and a filter having different optical characteristics from each other, and light detection is performed by these. As a result, of the adjacent reflected lights of the same pattern, only light of a specific wavelength band is transmitted, and image information in mutually different wavelength bands can be obtained. The optical characteristics of the lens and / or filter to be used may be appropriately determined depending on the color of the contamination to be detected. At this time, the required number of light detection means may be set according to the number of pictures printed on the inspection object. The illuminating means may be provided with a luminous intensity and a number sufficient to illuminate the pictures to be inspected without uneven illumination, but it is desirable to install the illuminating means for each light detecting means in order to minimize the uneven lighting.

Further, there is a method of illuminating adjacent same patterns in different wavelength bands. For example, by arranging lighting means that emit light of different wavelength bands unique to each,
There is a method of illuminating each adjacent identical pattern. In addition, a light source that emits light in the same wavelength band may be used, and filters having unique optical characteristics different from each other may be arranged between the illumination unit and the printed material. Further, these methods may be combined. As a result, light having a unique wavelength band is reflected for each of the same adjacent picture patterns, and image information in mutually different wavelength bands can be obtained. The wavelength band of the light emitted by the illumination means and the filter to be used may be appropriately determined according to the color of the contamination to be detected. At this time, the necessary number of light detection means and illumination means may be set according to the number of pictures printed on the inspection object.

Note that a method of capturing image information with a photodetector having different optical characteristics and a method of illuminating with light having different wavelength characteristics may be selected according to the situation. For example, when it is difficult or expensive to manufacture a filter, the wavelength band is adjusted with a light source. Also, both methods may be used in combination.

In carrying out the above-mentioned inspection method, it is desirable to carry out in-line during continuous printing. However, in order to enable inspection after printing, it is more desirable to provide a printed matter transport unit. The printed material conveying means may be the same as that generally used in printing.

Further, the printed matter may be kept stationary, and the light detecting means provided at a position facing the picture may be conveyed.

At this time, it is desirable to adopt a structure in which the illuminating means is also conveyed at the same time in order to minimize the unevenness of the illumination.

As described above, according to the present invention, it is not necessary to perform the three-color separation processing for performing the contamination inspection for a specific color as in the related art, thereby reducing the scale of the image processing apparatus. Therefore, costs can be reduced. In addition, the inspection accuracy is high, and the quality reliability of the printed matter can be improved.

[0046]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention is shown in FIG. 1 and will be described below. As shown in FIG. 1A, the same pattern is continuously printed on row A and row B on the printed matter 100. As shown in FIG. 1B, the white light sources 110A and 110A are located above the rows A and B.
OB are provided respectively. Further, similarly, light detection means 120A and 120B are provided respectively, and have a structure capable of performing control so as to perform scanning while facing each picture to be inspected.

The light detecting means 120A and 120B have optical systems 121A and 121A having different optical characteristics, respectively.
1B, and takes in the reflected light from the patterns in the rows A and B as image information only for different unique wavelength bands. In the present embodiment, the optical system 121
A filter (not shown) that transmits only light of a specific wavelength band is disposed on the front surface of the lens (not shown), but is not limited thereto, and a lens that transmits only light of a specific wavelength band. May be used, or a filter and a lens may be used in combination.

Now, in order to make the description more specific, the inspection process will be described by taking as an example the case where red contamination is present on the white portion of the pattern A1 of the printed matter 100 and this is detected.

Adjacent identical patterns printed at the positions A1 and B1 are illuminated by the white light source 110. The number of white light sources 110 may be one as long as the amount of light is sufficient,
In order to eliminate the adverse effect of disturbance light, it is desirable to install the light source in each of the row A and the row B. Here, the case where the white light sources 110A and 110B are arranged will be described.

Each of the light detecting means 120A and 120B is composed of a camera for taking in the reflected light from the picture of A1 and B1, respectively, and filters having different optical characteristics are provided on the front surface of the lens. That is, as shown in FIG. 2, a filter that transmits light of 550 nm or less is installed in the light detecting means 120A, and a filter that transmits light of 650 nm or more is installed in the light detecting means 120B as shown in FIG. .

The light detecting means 120A can take in only light of 550 nm or less. That is, it has a sensitivity of a blue system, and the reflected light from the white portion of the pattern of A1 is captured as image information in which only the red contaminated portion has fallen off. On the other hand, the light detecting means 120B can take in light of 650 nm or more. That is, it has a sensitivity of red system, and the white portion of the pattern of B1 is taken as image information as it is.

The image information thus obtained is stored in the image memories 131A and 131B, respectively, and the signal difference component between the respective image information is calculated in the calculation circuit 132C and transferred to the judgment circuit 133C. The threshold value memory 134C stores standard signal difference components obtained under the same conditions for two non-contaminated images of the same pattern as the inspection object. The determination circuit 133C compares the standard signal difference component with the previously transferred signal difference component, and determines the presence or absence of contamination based on the magnitude of the difference. If it is determined that there is contamination, a defect signal is output to notify the operator.

On the other hand, the same pictures A1, A2, A3... And B1, B2, B3 which are repeated in the transport direction of the printed matter 100
Are sequentially stored in the image memories 131A and 131B.
And calculation circuits 132A and 132B, respectively.
Is sequentially transferred to. The calculation circuit 132A calculates A1 and A
2, the image information signal difference components of A2 and A3, A3 and A4... Are sequentially calculated, while the calculation circuit 132B calculates B1 and B2,
The image information signal difference components of B2 and B3, B3 and B4... Are calculated and transferred to the determination circuit 133A. The threshold value memory 134A stores standard signal difference components obtained under the same conditions for two non-contaminated images of the same pattern as the inspection object. The determination circuit 133A compares this standard signal difference component with the previously transferred signal difference component, and determines the presence or absence of contamination based on the magnitude of the difference. If it is determined that there is contamination, a defect signal is output to notify the operator.

At this time, the position information of each picture accompanying the conveyance of the printed material 100 is obtained by the address control circuit 135, and the image processing is performed based on the position information. For example, a pulse is supplied from the address control circuit 135 to the photodetector 120A, and a rotary encoder 140 is arranged below the printed matter 100 as shown in FIG. It is preferable to obtain position information in the XY) directions. By doing so, accurate position information can be obtained, control of each process such as writing and reading in image information processing can be performed more accurately, and inspection accuracy can be improved.

Although the above description has been given of a printed matter composed of two rows, that is, row A and row B, the present invention is not limited to this. If they are arranged, it is possible to perform the inspection similarly.

Next, a second embodiment of the present invention will be described. The present embodiment is almost the same as the first embodiment, but illuminating means having different optical characteristics from each other is arranged for the rows A and B of the printed matter 100.

For example, light sources for irradiating light in different wavelength bands are arranged. Alternatively, for light sources in the same wavelength band,
A filter having optical characteristics different from each other, that is, a filter that transmits only light in a specific wavelength band different from each other is arranged.

In the light detecting means, the rows A and B may be the same, but those having different optical characteristics as in the first embodiment may be arranged.

As described above, the contamination inspection can be performed in exactly the same procedure as in the first embodiment. The effect is the same as that of the first embodiment.

Next, a third embodiment of the present invention will be described. Although the first and second embodiments show the case where the inspection is performed in-line at the time of printing, the present embodiment is an embodiment where the inspection is performed after the printing is completed.

The printed matter 100 in FIG. 1 is fixed, and the light detecting means 120A and 120B are scanned along the rows A and B. The detailed inspection procedure is the same as in the first and second embodiments.

When the inspection procedure is the same as that of the first embodiment, the number of illumination means may be one, but in order to eliminate the adverse effect of disturbance light, the light detection means 120A and 120A are required.
It is desirable to arrange for each of B and scan simultaneously. When the inspection procedure is the same as that of the second embodiment, the illuminating means is changed to the light detecting means 120A and 120B.
It goes without saying that they are arranged for each.

[0063]

As described above, according to the present invention, it is possible to cope with high-speed printing, and it is possible to accurately and efficiently perform a contamination test for a specific color component.

[Brief description of the drawings]

FIG. 1 is an apparatus schematic diagram for explaining a first embodiment of the present invention.

FIG. 2 is a diagram illustrating optical characteristics of a light detection unit according to the first embodiment of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 100 printed matter 110 white light source 120 light detection means 121 optical system 130 image processing device 131 image memory 132 calculation circuit 133 determination circuit 134 threshold value memory 135 address control circuit 140 rotary encoder

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B41F 33/14 G01N 21/89 G06T 7/00

Claims (26)

(57) [Claims] An illumination means for illuminating a printed matter on which a plurality of identical pictures are printed vertically and horizontally, and reflected light from the same picture which is adjacent in at least one of the pictures in the vertical and horizontal directions is different from each other. Light detecting means for obtaining image information by detecting in a wavelength band; and image information detected in the different wavelength bands.
Signal difference component of the same pattern without contamination in advance
The standard signal difference component obtained by the same method
To determine the presence or absence of contamination of the printed matter by comparing
Printed matter contamination detection apparatus characterized by comprising an image information processing apparatus. 2. The printed matter contamination detecting apparatus according to claim 1, further comprising scanning means for light detecting means. 3. A printed matter contamination detecting apparatus according to claim 1, further comprising a plurality of light detecting means each having an optical system having unique and different optical characteristics. 4. The printed matter contamination detecting device according to claim 3, further comprising a plurality of light detecting means each having a lens or a filter having a unique optical characteristic different from each other. 5. The printed matter contamination detection apparatus according to claim 4, further comprising a plurality of light detection units each having a lens and a filter having unique and different optical characteristics. 6. The printed matter contamination detection according to claim 1, further comprising a plurality of illuminating means for illuminating adjacent identical patterns with light of different wavelength bands. apparatus. 7. The printed matter contamination detection apparatus according to claim 6, further comprising a plurality of illumination units each including a light source having a unique light emission sensitivity characteristic. 8. A light source comprising: a plurality of illuminating units each including a light source and a filter that transmits light in a specific wavelength band with respect to light emitted from each of the light sources; The printed matter contamination detection device according to claim 6, wherein the printed matter contamination detection devices are different from each other. 9. The printed matter contamination detecting apparatus according to claim 1, further comprising a printed matter conveying means. 10. The printing apparatus according to claim 1, further comprising means for transporting the light detecting means between the pictures of the printed matter.
9. The printed matter contamination detection device according to any one of items 9 to 9. 11. The printed matter contamination detecting apparatus according to claim 10, further comprising means for conveying an illuminating means between pictures of the printed matter. 12. Reflected light from adjacent identical patterns
An image storage unit for storing each of the image information by detecting the respective specific different wavelength ranges, a calculation circuit for calculating an output signal difference of the image information, if the same pattern without contamination
Then, a threshold value storage unit to which a standard output signal difference obtained in advance is input, and the presence / absence of contamination is determined by comparing the output signal difference with the standard output signal difference. The printed matter detection apparatus according to any one of claims 1 to 11, further comprising a determination circuit that outputs presence. 13. The printing apparatus according to claim 1, further comprising: printed matter position information checking means; and address circuit control means for controlling image information processing based on the obtained position information. Printed matter contamination detection device according to the above. 14. A pattern in which a plurality of identical pictures are printed vertically and horizontally, and at least one of the pictures adjacent in the vertical or horizontal direction detects light reflected by illumination in different wavelength bands, and detects the different wavelength bands. Detected at
The signal difference component between the obtained image information
No similar patterns are asked for in the same way
Contamination by comparing with the standard signal difference component
A printed matter contamination detection method characterized by determining absence . 15. A position facing the pattern of the printed matter, according to the design of the part or the entire surface by scanning light detecting means, and detects the light reflected by the illumination
Item 15. A method for detecting printed matter contamination according to Item 14 . 16. Conveying a printed matter on which a plurality of identical pictures are printed vertically and horizontally, and continuously reflecting reflected light by illumination in a wavelength band different from each other for a picture adjacent to the picture in a direction perpendicular to the conveying direction of the printed matter. detected in, said of you each other
Between image information detected in different wavelength bands
Calculate the signal difference component and find the same pattern without contamination in advance.
And the standard signal difference component obtained by the same method.
16. The printed matter contamination detection method according to claim 14 , wherein the presence or absence of contamination is determined by performing a comparison . 17. The printed matter contamination detecting method according to claim 14, wherein the light detecting means is transported at a position facing the printed matter, and the reflected light by illumination is continuously detected. 18. The printed matter contamination detection method according to claim 17, wherein the illuminating means is transported at a position facing the printed matter. 19. The method according to claim 14, wherein, for adjacent identical patterns, reflected light due to illumination is respectively detected by light detecting means comprising an optical system having unique and different optical characteristics. The method for detecting contamination of printed matter according to one of the preceding claims. 20. The method according to claim 1, wherein the light reflected by the illumination is detected by light detecting means having a lens or a filter having unique and different optical characteristics.
10. The method for detecting printed matter contamination according to item 9. 21. The method according to claim 1, wherein the light reflected by the illumination is detected by light detecting means having a lens and a filter having unique and different optical characteristics.
10. The method for detecting printed matter contamination according to item 9. 22. The adjacent same pattern is illuminated with light of different wavelength bands from each other.
The method for detecting printed matter contamination according to any one of the above. 23. The printed matter contamination detecting method according to claim 22, wherein adjacent identical patterns are illuminated by a plurality of illuminating means including light sources having light emission sensitivity characteristics unique to each other. 24. A plurality of illuminating means comprising a light source and a filter which transmits only light in a specific wavelength band with respect to light emitted from the light source, and illuminates adjacent identical patterns, respectively. The method for detecting contamination of printed matter according to claim 22. 25. Reflected light by illumination is different for at least the same picture adjacent in the vertical or horizontal position direction.
Wavelength detected in the wavelength band, different to each other of said composed
Calculates signal difference components between image information detected in bands
The same method is used for the same picture without contamination in advance.
Is compared with the standard signal difference component obtained by
Is judged to be contaminated if the difference between
2. The method according to claim 1, further comprising outputting the presence of a dye.
25. The printed matter contamination detection method according to any one of 4 to 24. 26. The image processing apparatus according to claim 14, wherein the position of each picture on the printed matter is confirmed by the printed matter position information confirming means, and image information processing is controlled by an address control circuit based on the position information. The printed matter contamination detection method according to any one of the above.