JP7081785B2 - Printed matter inspection method and printed matter inspection equipment - Google Patents

Description

The present invention relates to a printed matter inspection method and a printed matter inspection apparatus for capturing a printed surface of a printed matter with an image pickup means and determining print quality based on the obtained image information.

Conventionally, this type of printed matter inspection device is provided with an image pickup means for capturing an image of the printed surface of a printed matter, a lighting means for illuminating the image pickup surface, and a determination means for determining print quality based on image information obtained by the image pickup means. The determination means compares the density level of the area image of the master image of the reference symbol with the density level of the area image of the image information corresponding to the area image for the image information of the captured symbol, and the density level difference is predetermined. It is known that a portion having a value equal to or higher than a set allowable value is determined to be a defect (see, for example, Patent Document 1). Although each area image to be compared in this way is an RGB image, there is a problem that the accuracy of detecting (identifying) defects is particularly low for intermediate colors between R / G / B, such as yellow.

Further, the same problem occurs in the scene of color tone control (color matching) of the printing apparatus. Color control of the printing device can be performed over time using a dedicated expensive spectral density / colorimeter on an offline color observatory, but as a simpler and more practical method, the printing device is used. The color bar and color chart of a non-defective printed matter printed in 1 are measured by a camera, the color difference from the reference color information is calculated, and the ink key opening is adjusted.

Specifically, the RGB data of each color patch of the color bar and color chart captured by the camera is set to the device independent color (especially defined by ICC) which is neutral color information such as CIE-XYZ and Lab. Color matching is performed by comparing with the standard created by the color information of the device independent color (see, for example, Patent Documents 2 to 4). For conversion from RGB data, the ICC device profile as a conversion table provided in the camera is used, but it is also difficult to accurately distinguish between neutral colors such as yellow and black and blue colors, and color matching is performed. There was a problem that the accuracy of the was reduced.

In this color matching scene, in order to measure colors with higher accuracy, color information is acquired in a multi-band divided into four or more wavelength regions that exceed the three primary colors of RGB by imaging with multiple cameras equipped with color filters. However, it has been proposed to utilize a multi-band imaging technique that estimates (color reproduction) the spectral reflectance of the printed surface from this multi-band image (for example, a Chromasens spectrum with four cameras and a color filter). Color measurement line camera "true PIXA").

However, multi-band shooting is expensive because it requires multiple high-performance cameras, and calibration and field of view are required to prevent chromatic aberration, and it is delicate and the shooting area is limited, so it is special for color matching. It is a device that has been converted into a new device, and cannot be used as a camera for inspecting defects in patterns. Moreover, since the resolution of each camera is limited, there is a certain limit to the accuracy that can be obtained. Further, since a predetermined color filter is used, there is a problem that flexible measures such as changing the wavelength region to be divided according to the target color cannot be taken.

Japanese Unexamined Patent Publication No. 6-201611 Japanese Unexamined Patent Publication No. 2001-253054 Japanese Unexamined Patent Publication No. 2004-159332 Japanese Unexamined Patent Publication No. 2011-230413

Therefore, what the present invention seeks to solve in view of the above-mentioned situation is that it can accurately detect printing defects of intermediate colors such as yellow, and also uses multi-band photographing technology in the scene of color matching (color tone control). It is an object of the present invention to provide a printed matter inspection method and a printed matter inspection apparatus capable of performing color matching more accurately including neutral colors, blacks, and blues by also serving as an inexpensive imaging means for detecting print defects.

That is, the present invention includes the following inventions.
(1) An image pickup means for imaging the printed surface of a printed matter, a lighting means for illuminating the image pickup surface by the image pickup means, and a determination means for determining print quality based on the image information obtained by the image pickup means are provided. As the illuminating means, at least two kinds of light sources having different colors and illuminating on the same imaging surface are provided, and each light source is dimmed to control the illuminating light of the illuminating means. Inspection methods.

(2) A detection means for detecting color information is provided based on the image information obtained by the image pickup means, and the illumination light of the illumination means is the first illumination light to which each light source is dimmed for printing quality determination. , Each light source is switched to a dimmed second illumination light for color information detection, and the determination means excludes the color tone based on the image information obtained under the first illumination light. The printed matter inspection method according to (1), wherein the detection means detects the color information based on the image information obtained under the second illumination light.

(3) As the second illumination light, a plurality of illumination lights having different dimming balances by each light source are set, and the second illumination light of the illumination means is set for a plurality of the same printed surfaces. The printed matter inspection method according to (2), wherein the lighting is switched to different illumination lights.

(4) When the printing surface has a symbol region and a color bar region, and the imaging surface for imaging the symbol region is illuminated with the first illumination light to image the color bar region. The image pickup surface is illuminated with the second illumination light, and the second illumination light is switched to the set different illumination light for the color bar areas of the same printing surface (2). The printed matter inspection method described.

(5) When the printing surface is a color chart for creating a conversion table, the printing surface of the same color chart is imaged a plurality of times by the imaging means, and the imaging surface of the color chart is seconded for each imaging. The printed matter inspection method according to (2), wherein the second illumination light is illuminated with the irradiation light, and the second illumination light is switched to the different illumination light set for the same print surface of the color chart for each imaging.

(6) As the light source of the lighting means, three types of LED light sources that emit illumination of each color of R / G / B are provided, and the LED light sources of each type are spaced along the width direction orthogonal to the printed matter transport direction. The printed matter inspection method according to any one of (1) to (5), wherein a plurality of light sources are arranged and the lighting light of the lighting means is controlled by dimming each LED light source.

(7) A printed matter inspection including an image pickup means for imaging the printed surface of the printed matter, a lighting means for illuminating the image pickup surface by the image pickup means, and a determination means for determining the print quality based on the image information obtained by the image pickup means. In the device, the lighting means includes at least two types of light sources having different colors from each other, which are illuminated on the same imaging surface, and dimming each light source to control the illumination light of the lighting means. A printed matter inspection device characterized in that a lighting control means is provided.

(8) A detection means for detecting color information based on the image information obtained by the image pickup means is provided, the illumination control means dimmes the illumination light of the illumination means, and each light source is dimmed for printing quality determination. The first illumination light and the second illumination light to which each light source is dimmed for color information detection are switched and controlled, and the determination means obtains the image information under the first illumination light. The printed matter inspection apparatus according to (7), which determines the print quality excluding the color tone based on the above.

(9) As the second illumination light, a plurality of illumination lights having different dimming balances by each light source are set, and the illumination control means uses a plurality of the same second illumination lights of the illumination means. The printed matter inspection apparatus according to (8), wherein the printed surface is illuminated by switching to the different set illumination light.

(10) The printing surface has a design area and a color bar area, and the lighting control means illuminates the illumination light of the lighting means with the first illumination light on the image pickup surface when the design area is imaged. The image pickup surface for imaging the color bar area is illuminated with the second illumination light, and the second illumination light is emitted to the color bar areas of a plurality of the same printing surfaces, which are different from each other. The printed matter inspection device according to (8), which switches to illumination light and illuminates the light.

(11) When the printed surface is a color chart for creating a conversion table,
The imaging means captures the printed surface of the same color chart multiple times, and at the same time,
The illumination control means illuminates the imaging surface of the color chart with the second irradiation light for each imaging, and the second illumination light is set for the same printing surface of the color chart for each imaging. The printed matter inspection device according to (8), which switches to a different illumination light for illumination.

(12) The lighting means includes, as the light source, three types of LED light sources that emit illumination of each color of R / G / B, and the LED light sources of each type are along the width direction orthogonal to the printed matter transport direction. The printed matter inspection device according to any one of (7) to (11), wherein a plurality of lighting control means are arranged at intervals, and the lighting control means dimmes each LED light source to control the lighting light of the lighting means.

According to the present invention as described above, at least two types of light sources having different colors are provided, and each light source is dimmed to control the illumination light of the lighting means, thereby printing as in the multi-band photographing technique. A multi-band image of a surface can be obtained, and detailed color information on the printed surface can be obtained from this multi-band image by using a known color reproduction technique (spectral color measurement technique), and printing defects of intermediate colors such as yellow can be obtained. Can be detected with high accuracy, and even in the scene of color matching (color tone control), color matching can be performed more accurately including intermediate colors, blacks, and blues.

Also, unlike the multi-band photography technology that divides the wavelength region with a color filter, the form of division can be freely changed by the dimming balance of each light source, so it is flexible and more optimal multi-band image according to the target color. Can be obtained in more detail, so that inspection and color matching can be performed more accurately.

Further, the camera side is not restricted and the field of view can be freely changed, and the shooting area can be freely set widely, so that it is suitable not only for color matching scenes but also for inspection of print defects of patterns. Therefore, the camera can be used for both color matching and inspection, and efficiency can be improved. Further, since the dimming is performed by increasing the types of light sources, it is not necessary to provide a large number of high-performance cameras and color filters, and the cost can be kept low.

Explanatory drawing which shows the printed matter inspection apparatus and printing apparatus which concerns on this invention. Explanatory drawing which shows the lighting apparatus. Explanatory drawing which shows the structure of the processing apparatus which concerns on 1st Embodiment. An explanatory diagram showing the configuration of the storage means as well. Explanatory drawing which shows the structure of the processing apparatus which concerns on 2nd Embodiment. An explanatory diagram showing the configuration of the storage means as well.

Next, an embodiment of the present invention will be described in detail with reference to the accompanying drawings. First, the first embodiment will be described with reference to FIGS. 1 to 4.

As shown in FIG. 1, the printed matter inspection device 1 according to the present invention is obtained by an image pickup means 2 for imaging a printed surface P of a printed matter, a lighting means 3 for illuminating an image pickup surface F by the image pickup means 2, and an image pickup means 2. It is a device provided with a determination means 41a for determining print quality based on the image information to be obtained, and the illumination means 3 is illuminated on the same image pickup surface, and at least two kinds of light sources having different colors from each other (this example). In addition to providing R / G / B LED light sources 30R, 30G, 30B), lighting control means 41b for dimming each light source 30R / 30G / 30B to control the illumination light by the illumination means 3 is provided. It is characterized by that.

The printed matter to be inspected in the present invention exemplifies a method of printing on a plurality of sheets in a cut state, but the same type of printing is printed on a continuous strip-shaped sheet instead of the cut sheet. The present invention can also be applied in the same manner. It may be other than a sheet. In addition to paper, various printed matter materials such as synthetic resin films and aluminum foil are included. Reference numerals 11A, 11B, 11C, and 11D indicate four printing devices that print inks of four kinds of colors. The printing devices 11A, 11B, 11C, and 11D are, for example, offset rotary printing machines, and can be applied to various printing devices such as flexographic printing machines and gravure printing machines.

Similar to the image pickup means used in the conventional inspection device, the image pickup means 2 is provided with a plurality of image pickup cameras along the width direction orthogonal to the transport direction 10 of the printed matter, and images an area over the entire width of the work. A line sensor camera in which a plurality of CCD or CMOS image sensors are arranged side by side in the horizontal direction orthogonal to the transport direction may be used. The number and arrangement of the cameras are not particularly limited as long as they can image the work W, and even if a single or multiple area sensor cameras in which a plurality of CCD or CMOS image sensors are arranged side by side in the vertical and horizontal directions are provided in addition to the line sensor camera. good.

As shown in FIG. 2A, the lighting means 3 includes three types of LED light sources that emit illumination of each color of RGB as a light source, and the LED light sources 30R, 30G, and 30B of each type are in the printed matter transport direction, respectively. A plurality of them are arranged at intervals along the orthogonal width direction. In addition to arranging three rows in parallel in a straight line as shown in the figure, each type of light source is uniformly distributed in each row in a staggered manner as shown in FIG. 2 (b). This form is also preferable in that the light from each light source is uniformly synthesized as the illumination light. The lighting means 3 illuminates the printed matter with substantially uniform illuminance over the entire width.

The LED light sources 30R, 30G, and 30B use red LEDs, green LEDs, and blue LEDs, respectively, but may be a combination of LEDs of other colors. Further, some or all of the LEDs may be of the same color (for example, white), and by providing a color filter thereof, two or more kinds of light sources that emit different colors may be used. Further, in the present invention, it is sufficient that a multi-band image can be obtained with at least two kinds of light sources having different colors, and it is not necessary to have three kinds as in this example, and it is not necessary to use an LED. Of course, a straight tubular fluorescent lamp or a halogen lamp that is long in the lateral direction may be provided. However, LEDs are preferable because they can be switched instantly.

The determination means 41a and the lighting control means 41b are provided in the processing device 41 constituting the computer. Reference numeral 42 is a storage means connected to the processing device 41. The processing device 41 is mainly composed of a CPU such as a microprocessor, and is connected to an image pickup means 2, a lighting means 3, a storage means 42, and an adjustment mechanism 12 of the printing devices 11A to 11D through an input / output unit and a bus line, respectively. Send and receive various information. The storage means 42 is composed of storage memories such as RAMs and ROMs inside and outside the processing device 41, a hard disk, and the like, and stores programs and processing data that define procedures for various processing operations in the processing device 41. FIG. 3 shows the configuration of the processing device 41 of the present embodiment, and FIG. 4 shows the configuration of the storage means 42 as well.

As shown in FIG. 3, the processing device 7 functionally detects color information (multi-band image) based on the image information obtained by the image pickup means 2 in addition to the determination means 41a and the illumination control means 41b. Adjustment command processing that emits a control signal that controls the adjustment mechanism 12 of the printing device, the conversion processing unit 41d that converts the color information detected by the detection means 41c into the color space coordinates of the color reference value of each color patch. It includes at least a unit 41e, and these functions are realized by the above program.

In the present embodiment, the determination means 41a is a first determination means 51 for determining print quality such as print defects excluding color tones, and a second determination means for determining color tone variation from image information of each color patch of the color bar. It is equipped with 52. Further, the illumination control means 41b uses the illumination light of the illumination means 3 for the first illumination light to which each light source is dimmed for printing quality determination (for determination by the first determination means) and for color information detection (for color information detection). Each light source is switched to the dimmed second illumination light for determination by the second determination means) and controlled.

As for the second illumination light, a plurality of illumination lights having different dimming balances by each light source are set, and the illumination control means 41b directs the second illumination light of the illumination means to a plurality of the same printed surfaces. Then, it is switched to the different illumination light set and illuminated. As a result, a plurality of multi-band images are obtained, and the determination accuracy of the second determination means related to the color tone variation is improved.

The first determination means 51 determines the print quality excluding the color tone based on the image information obtained under the first illumination light, and the master image and the image to be inspected (image) extracted from the master image storage unit 42a. Information) is compared to inspect the surface to be inspected for defects. A known method can be widely adopted for the processing of the comparative inspection. In this example, the method described in JP-A-6-201611 is adopted. Here, the first illumination light may be white illumination with each light source having the same amount of light, or may be other illumination with a different light amount balance.

Specifically, it is composed of a comparison value calculation processing unit 51a and an allowance determination processing unit 51b, and the comparison value calculation processing unit 51a has a density level of an area image of a master image and an image to be inspected (image information) corresponding to the area image. The density level difference is obtained by comparing with the density level of the area image of the above, and if the tolerance determination processing unit 51b compares this density level difference with the preset allowable value and becomes equal to or more than the allowable value, the relevant portion is determined as a defective part. Then, it is stored in the determination result storage unit 42b. The master image may be an image obtained by capturing an image of a passing product of an actually printed printed matter, or may be digital data created by DTP (Desk Top Publishing) or CTP (Computer To Plate).

The detection means 41c has a plurality of multi-bands for each image information captured under illumination switched to the preset different illumination light each time the position of the same color bar of a plurality of printed materials is captured by the lighting control means 41b. Images are obtained and sequentially stored in the band image storage unit 42c of the storage means, and these are extracted from the storage means to obtain detailed color information of each color patch by a known color reproduction technique in the field of spectroscopic color measurement, and colors are obtained. It is stored in the information storage unit 42d.

Further, the conversion processing unit 41d extracts the color information detected by the detection means 41c from the color information storage unit 42d, converts it into the color space coordinates of the color reference value of the color patch, and converts it into the color space coordinate storage unit 42e. It is stored and calculated approximately to the XYZ color system, which is the color space of the standard value, or converted to the CIE-Lab color system, which is the color space of the standard value, using a preset conversion table (profile). It is preferable to do so. It may be converted into a d value which is the depth of the color and compared with the d value of the reference color patch.

The second determination means 52 compares the value of the color space coordinate storage unit 42e converted by the conversion processing unit 41d with the reference value of the same color space coordinate system stored in the reference value storage unit 42f, and the result thereof. The comparison value calculation processing unit 52a that calculates the comparison value (for example, ΔE of the CIE-Lab color system) and stores it in the comparison value storage unit 42g, calculates whether or not this comparison value is within the allowable range, and if it is out of the allowable range. For example, it is provided with a permissible determination processing unit 52b that stores the determination result storage unit 42h of the storage means as having a color tone variation. When the tolerance determination processing unit 52b determines that there is a color tone variation, the adjustment command processing unit 41e calculates the control amount of each ink key opening degree of the printing devices 11A to 11D, and generates and adjusts a command signal for the control. It is transmitted to the mechanism 12.

As described above, in the present embodiment, the image pickup surface when imaging the design area of the print surface is illuminated with the first illumination light to perform a quality inspection other than the color tone, and at the same time, the color bar area of the printed matter is also imaged. At this time, a plurality of different second illumination lights are sequentially illuminated, detailed color information is obtained for each carla patch of the same color bar, and color tone variation is determined by color matching. The color bar area is imaged under the illumination of the second illumination light, which is different for each shooting, but the timing does not need to be imaged for all the printed matter, and the images are taken every predetermined number of printed matter, and the total is taken. It suffices to obtain the required multiple multi-band images.

Next, a second embodiment will be described with reference to FIGS. 1, 5, and 6.

In this embodiment, the color tone variation is not determined by the color bar of the printed matter, but the ICC profile as a conversion table for directly determining the color tone variation from the color information in the design area of the printed surface is captured by the print quality inspection device. It is created in detail by means, and color matching of the design area is performed by using this, so that the color tone variation can be determined. Since the basic configuration is the same as that of the first embodiment, the same reference numerals are used and the description thereof will be omitted.

That is, in the present embodiment, the printing surface of the color chart for creating the ICC profile at the initial stage of printing by the printing apparatus is imaged a plurality of times by the imaging means 2 under the second illumination light. Here, the illumination control means 41b switches the second illumination light to a different preset illumination light for each image pickup to illuminate the image. As a result, a plurality of multi-band images can be obtained for each color patch of the color chart. Therefore, as in the case of the first embodiment, this is used as detailed color information by a known color reproduction technique, and the color chart is the same as before. Compare the color of the printed surface with the coordinate values of the CIE-lab color system or CMYK color system, which is the standard for color measurement using a dedicated spectral density / colorimeter (for example, x-rite eXact manufactured by X-Rite). Then, the ICC profile which is a conversion table can be created.

The color chart of the same printed matter is used as the standard, but the proof of the same color chart may be color-measured, the standard value (for example, Japan color), and others may be used as the reference value.

Similar to the first embodiment, the printed matter inspection device 1 of the present embodiment has an imaging means 2 for imaging the printed surface P of the printed matter and a lighting means 3 for illuminating the imaging surface F by the imaging means 2, as shown in FIG. A device including a determination unit 41a for determining print quality based on image information obtained by the image pickup means 2, and at least different colors of the illumination means 3 are illuminated on the same image pickup surface. Lighting control provided with two types of light sources (R / G / B LED light sources 30R, 30G, 30B in this example) and dimming each light source 30R / 30G / 30B to control the illumination light by the illumination means 3. Means 41b are provided.

FIG. 5 shows the configuration of the processing device 41'of the present embodiment, and FIG. 6 shows the configuration of the storage means 42'. In the present embodiment, the second determination means 52'of the determination means 41a'is to be processed after the ICC profile is created, and the color tone changes (CIE-Lab) using the ICC profile from the image information in the design area. Performs a process of determining (such as ΔE of the color system). The illumination light of the illumination means 3 at this time may be the first illumination light or the second illumination light.

The detection means 41c'is related to a process at the time of creating an ICC profile, and a plurality of multis for each image information captured under illumination switched to a different illumination light preset each time a color chart is imaged. Band images are obtained and sequentially stored in the band image storage unit 42c, and these are extracted from the storage means to obtain detailed color information of each color patch of the color chart by a known color reproduction technique, and the color information storage unit 42d Remember in.

In the present embodiment, the corresponding coordinates of the color information stored in the color information storage unit 42d and the reference CIE-lab color system or CMYK color system stored in the reference value storage unit 42e'of the storage means. A profile creation processing unit 41f'that creates an ICC profile that is a conversion table by comparing with the value and stores and manages the ICC profile is provided in the profile storage unit 42f. The created ICC profile is used at the time of determining the color tone variation by the second determination means 52.

When the second determination means 52 determines that there is a color tone variation, the determination result storage unit 42g'stores it, and the adjustment command processing unit 41e calculates the control amount of each ink key opening degree of the printing devices 11A to 11D. A command signal for the control is generated and transmitted to the adjustment mechanism 12.

Although the embodiments of the present invention have been described above, the present invention is not limited to these examples, and the present invention is carried out in various forms as long as the gist of the present invention is not deviated, for example, those which do not perform color matching. Of course, it can be done.

1 Printed matter inspection device 2 Imaging means 3 Lighting means 7 Processing device 10 Transport directions 11A, 11B, 11C, 11D Printing device 12 Adjustment mechanism 30R / 30G / 30B Light source 41 Processing device 41a, 41a'Judgment means 41b Lighting control means 41c, 41c 'Detecting means 41d Conversion processing unit 41e Adjustment command processing unit 41f Profile creation processing unit 42 Code 42 Storage means 42a Master image storage unit 42b Judgment result storage unit 42c Band image storage unit 42c Sequential band image storage unit 42d Color information storage unit 42e Color Spatial coordinate storage unit 42e'Reference value storage unit 42f Reference value storage unit 42f'Profile storage unit 42g Comparison value storage unit 42g' Judgment result storage unit 42h Judgment result storage unit 51 First determination means 51a Comparison value calculation processing unit 51b, 51b'Allowance judgment processing unit 52 Second judgment means 52a Comparison value calculation processing unit 52b Allowance judgment processing unit P Print surface W Work

Claims (8)

An image pickup means for capturing an image of the printed surface of a printed matter, a lighting means for illuminating the image pickup surface by the image pickup means, and a determination means for determining print quality based on the image information obtained by the image pickup means are provided.
As the illumination means, at least two kinds of light sources having different colors, which are illuminated on the same imaging surface, are provided.
It is a printed matter inspection method that controls the illumination light of the lighting means by dimming each light source.
A detection means for detecting color information based on the image information obtained by the image pickup means is provided.
The illumination light of the illumination means is switched and controlled between a first illumination light in which each light source is dimmed for printing quality determination and a second illumination light in which each light source is dimmed for color information detection.
Based on the image information obtained under the first illumination light, the determination means determines the print quality excluding the color tone, and determines the print quality.
A printed matter inspection method in which the detection means detects color information based on the image information obtained under the second illumination light. As the second illumination light, a plurality of illumination lights having different dimming balances by each light source are set.
The printed matter inspection method according to claim 1, wherein the second illumination light of the illumination means is switched to the set different illumination light to illuminate a plurality of the same printed surface. The printed surface has a design area and a color bar area.
The first illumination light is illuminated on the image pickup surface when the symbol area is imaged.
The second illumination light is illuminated on the image pickup surface when the color bar area is imaged.
The printed matter inspection method according to claim 1, wherein the second illumination light is switched to the set different illumination light to illuminate a plurality of color bar areas on the same print surface. When the printed surface is a color chart for creating a conversion table,
The image pickup means captures the printed surface of the same color chart multiple times and at the same time.
The imaging surface of the color chart is illuminated with the second irradiation light for each imaging.
The printed matter inspection method according to claim 1, wherein the second illumination light is switched to the different illumination light set for the same print surface of the color chart for each imaging. An imaging means that captures the printed surface of printed matter, and
Illumination means for illuminating the image pickup surface by the image pickup means, and
A printed matter inspection device including a determination unit for determining print quality based on image information obtained by the image pickup means.
The illumination means includes at least two light sources having different colors and being illuminated on the same imaging surface.
A printed matter inspection device provided with a lighting control means for dimming each light source and controlling the lighting light of the lighting means.
A detection means for detecting color information based on the image information obtained by the image pickup means is provided.
The illumination control means uses the illumination light of the illumination means as a first illumination light to which each light source is dimmed for printing quality determination and a second illumination light to which each light source is dimmed for color information detection. Switch to and control,
A printed matter inspection device in which the determination means determines print quality excluding color tones based on the image information obtained under the first illumination light. As the second illumination light, a plurality of illumination lights having different dimming balances by each light source are set.
The printed matter inspection device according to claim 5 , wherein the illumination control means switches the second illumination light of the illumination means to the set different illumination lights on a plurality of the same printed surfaces. The printed surface has a design area and a color bar area.
The illumination control means illuminates the illumination light of the illumination means with the first illumination light on the imaging surface when imaging the symbol region, and the imaging surface when imaging the color bar region is the second. The printed matter inspection apparatus according to claim 5 , wherein the second illumination light is illuminated by the illumination light, and the second illumination light is switched to and illuminated by the different illumination lights set for the color bar areas of the same printing surface. When the printed surface is a color chart for creating a conversion table,
The imaging means captures the printed surface of the same color chart multiple times, and at the same time,
The illumination control means illuminates the imaging surface of the color chart with the second irradiation light for each imaging, and the second illumination light is set for the same printing surface of the color chart for each imaging. The printed matter inspection device according to claim 5 , wherein the lighting is switched to a different illumination light.

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