JP5799425B2 - Printed material capable of authenticating authenticity, manufacturing apparatus and manufacturing method thereof, authentication apparatus for printed matter capable of authenticating authenticity and authentication method thereof - Google Patents

Description

  The present invention relates to a printed matter capable of authenticating authenticity for valuable printed matter such as securities, various certificates and important documents for the prevention of counterfeiting, an apparatus for manufacturing the same, a manufacturing method thereof, an authentication apparatus for printed matter capable of determining authenticity, and It relates to the authentication method.

  Countermeasures against counterfeiting and alteration are important elements in printed materials such as securities, various certificates and important documents. As a main forgery and alteration prevention measure, there is a method of embedding invisible information into a printed material by some means and reading the invisible information by some means.

  Today, there are various methods and means depending on the sensor for reading. As a mechanical reading inspection method for printed matter, there are mainly used functional inks such as magnetic ink, infrared reflection absorption ink and fluorescent ink, and detection of materials such as fibers, materials and chemicals forming a printing medium. However, these technologies are caused by specific electromagnetic waves that cannot be detected by humans. Many of these technologies depend on the material suitability for producing printed matter, and are only applied to products that are economical in terms of production cost. I can't.

  On the other hand, as a method not particularly considering the production cost of the printed matter, there is an optical reading method for a pattern on the printed matter to which a printing material such as a visible general printing ink can be applied. As comparatively easy optical reading methods, OCR, OMR, barcode, two-dimensional code, etc. are known, but the figures used in these optical reading methods do not have any design properties and are not available in existing products. When used, it is required to change the design and specifications.

  In addition, these optical reading methods are also widely available in the market, and since codes can be seen as printed lines, there is a risk of decoding and tampering. It is enough.

  Furthermore, there is a series of techniques generally called electronic watermarks as a method for providing reading information without changing the design such as the design by the optical reading method. The electronic watermark is also called a concealed image or a digital watermark, and is a technology for embedding copyright information in a document file or a printed material in a copy technology or a DTP technology with high functionality as a main application. As a well-known representative technique for printed materials, there is a method called frequency utilization type.

  Electronic watermarks are said to have little deterioration in frequency characteristics even in duplicates. Recently, digital watermarks are often applied to digital images distributed on the Internet for the purpose of copyright protection. In addition, since it has an effect on printed matter, it is often used for posters.

  It is a continuous gradation (photographic gradation) pattern that an electronic watermark can exert the most effect. Since the continuous tone (photo gradation) pattern is multi-valued image data, there is sufficient redundancy, so not only the frequency-based type but also the pixel replacement type, the pixel space usage type, the quantization error diffusion type, etc. A method is proposed, and there are many literatures and patent applications.

  However, since many electronic watermarks are designed for image resolution of general commercial printing, there is a feature that the original information is copied as it is in the duplicate, and as a measure to show the copyright of the duplicate Is suitable, but the original and the copy cannot be distinguished, and it is insufficient as a technique for authenticating the article.

Therefore, the present inventors have described "a printed matter and a discrimination method capable of determining authenticity and a method for embedding information in the printed matter" (Patent Document 1), "a printed matter and a discrimination method capable of determining authenticity, and the printed matter." the embedding method of the information "(Patent Document 2) and" printed matter, as well as the authentication method of the printed matter "(Patent Document 3), the background pattern, the print image lines consisting of free curves like Simon patterns, mechanically There has already been filed a printed matter characterized by identification. However, since these inventions are techniques applied to the chromatic pattern by the line expression shown in FIG. 1, they cannot be applied to a continuous gradation (photographic gradation) pattern.

JP 2003-200367 A JP 2003-246134 A WO2006 / 106677

  The present invention has been made in view of the above points, and the present invention cannot visually recognize the color components having high brightness constituting the color printed material in valuable printed materials such as securities, various certificates and important documents. By giving frequency modulation at a level, the object is to give predetermined information to be embedded without losing the artistic effect while maintaining continuous tone in color prints. In addition, in order to strengthen the signal of information used in the conventional information embedding / reading technology, a true regularity is achieved by giving a highly regular image line a concentric image line structure with high regularity. It is an object of the present invention to provide a printed material that can be falsely identified, an apparatus for producing the printed material, a method for producing the printed material, an authentication apparatus for the printed material that is capable of authenticating the authenticity, and an authentication method thereof.

  The printed matter capable of authenticating authenticity of the present invention extracts a predetermined color element having a high lightness from among a plurality of color elements, and extracts the predetermined color extracted from the plurality of color elements. When a frequency analysis is performed on an image composed of the color elements, a frequency component corresponding to the information to be embedded is extracted, and the printed material is capable of authenticating authenticity. Each of the color elements has a different hue and a predetermined color. An image composed of elements is formed by at least one region in which concentric lines having a predetermined interval set so that frequency components corresponding to information to be embedded are extracted, and an image composed of the remaining dye is formed. The line area ratio of the drawing line group formed by at least one region where the drawing line group having a shape different from that of the concentric line is arranged, and having a shape different from that of the concentric line and the concentric line is represented by a continuous floor. According to key Not allowed, characterized in that it is formed.

  The interval between the lines of the concentric lines of the printed matter capable of determining authenticity according to the present invention is selected from a plurality of preset intervals for each piece of information to be embedded.

  The printed matter capable of authenticating authenticity of the present invention is characterized in that a predetermined color element having high brightness is a yellow component, and the remaining color elements are a cyan component and a magenta component.

  The image line group having a shape different from the concentric lines of the printed matter capable of authenticating authenticity according to the present invention is formed by at least one of a direct image line and a dot pattern.

  The printed matter capable of authenticating authenticity according to the present invention has a line area ratio of an image composed of predetermined color elements having high lightness, and a line area of a concentric line in the center line of each line. The distance between the center lines of the respective image lines is always kept at the same distance.

  In the printed matter capable of determining authenticity of the present invention, the area where the concentric lines are arranged is divided into a plurality of areas, and each of the divided areas is formed with concentric lines that share the same center point. The interval between the drawing lines of the concentric lines in each of the divided areas is different for each area.

  In the printed matter of the present invention, the area where the concentric lines are arranged is divided into a plurality of areas, and each of the divided areas has a different center point for each area, and the concentric lines are arranged. The interval between the lines of concentric lines formed in each of the divided areas is different for each area.

  In the printed matter capable of determining authenticity of the present invention, the area where the concentric lines are arranged is divided into a plurality of rings, and each of the divided areas has a concentric line sharing the same center point. At the boundary of each region formed and divided into multiple regions, an interpolation region is provided that is composed of an average value of the interval between the concentric lines in one adjacent region and the interval between the concentric lines in the other region. And the continuity of concentric lines is maintained at the boundary.

  The printed matter capable of determining authenticity of the present invention is characterized in that the interval between the lines of concentric lines is 50 μm to 350 μm.

  A device for producing authenticity-identifiable printed matter of the present invention, a color image input means for inputting a color image as a motif of a printed image of the authenticity-identifiable printed matter, and a color image obtained by the color image input means Color separation means that separates the predetermined color channel into color elements having high brightness and the remaining pigment, and frequency components corresponding to information to be embedded are extracted. Information input means for inputting information on concentric lines having a predetermined interval set, and a frequency component corresponding to information to be embedded in a predetermined color element having a high lightness obtained by color separation of the color image is extracted. The information of the concentric lines having a predetermined interval set in the above is input by the information input means to generate the concentric lines data, and the remaining pigment has at least one image different from the concentric lines. A document file is created by combining information embedding means for generating group data, concentric line data set for predetermined color elements having high brightness, and at least one line group data set for the remaining pigments. The image synthesizing means to be generated, and the document file are provided with output means for printing on a base material with a predetermined color ink for output.

  Production of a printed matter capable of authenticating authenticity of the present invention using an apparatus for producing authenticity-identifiable printed matter provided with a color image input means, color separation means, information input means, information embedding means, image composition means and output means A method of inputting a color image that is a motif of a printed image of a printed matter that can be checked for authenticity by a color image input unit, and a predetermined color channel in which the input color image can be printed by a color separation unit And separating the predetermined color channel into high-luminance color elements and remaining pigments, and a predetermined frequency component set so that frequency components corresponding to information to be embedded are extracted by the information input means. The step of inputting information on concentric lines having intervals and the information embedding means convert the extracted information into predetermined color elements having high brightness. Generating at least one image line group data different from the concentric lines for the remaining pigment, and concentric line data set to predetermined color elements having high brightness by the image composition means A step of generating a document file by synthesizing at least one image line group data set for the remaining pigments, and an output means for outputting the document file by being overprinted on a substrate with a predetermined color ink It has a step.

  The method for producing a printed matter capable of authenticating authenticity according to the present invention is characterized in that a color element having high brightness is a yellow component, and the remaining pigments are a magenta component and a cyan component.

  An authentication apparatus for printed matter capable of authenticating authenticity according to the present invention, comprising: a reading unit that reads a print image in which predetermined information to be embedded is embedded as a color image; and a gray color element having high brightness from the read color image. Color separation means for extracting a scale image, conversion means for Fourier transforming the extracted gray scale image to generate an FFT pattern, analysis means for extracting a frequency component from the FFT pattern, and memory for storing authenticity determination data And determining means for authenticating a printed matter that can be determined as authenticity by comparing and comparing the frequency component and the authenticity determination data stored in the storage means.

  An authentication method for a printed matter capable of authenticating authenticity according to the present invention, using an authentication device for authenticating a printed matter provided with a reading means, a color separating means, a converting means, an analyzing means, a determining means, and a storage means, A step of reading a print image in which predetermined information to be embedded is embedded as a color image by a reading unit; and a step of extracting a grayscale image of a color element having high brightness from the read color image by a color separation unit; A step of Fourier transforming the extracted grayscale image by the conversion means to generate an FFT pattern, a step of extracting a frequency component from the FFT pattern by the analysis means, a frequency component extracted by the determination means, and storage Printed material that can be checked for authenticity by comparing and checking the authenticity determination data stored in the means Authentication comprises carrying out.

  The method for authenticating printed matter capable of authenticating authenticity according to the present invention is characterized in that a color element having high brightness is a yellow component.

  According to the present invention having the above-described configuration, information to be embedded is determined in advance in a color component having high brightness that constitutes a printed matter that can be determined as authenticity so that it cannot be recognized by human vision. It is possible to detect the embedded information in a digital device such as a scanner or a copying machine, and by performing operations such as extraction of a predetermined color component, Fourier transform, and extraction of a specific frequency on the digital device. It becomes possible to analyze the embedded information.

  Further, in the image line used in the present invention, it is impossible to recognize the information embedded in the printed matter that can be determined as authenticity by human vision. It is possible to give information to any subject without reducing the image.

  In addition, since the interval between the lines of the concentric circles in the present invention is 50 μm to 350 μm, it is not visually recognized by the naked eye, and exhibits an anti-counterfeit effect even in a color copying machine or the like.

  Furthermore, compared to the technology that embeds and reads invisible information described in the prior art, the signal strength of the information is very high because it gives a highly regular image line with a highly concentric image line configuration. Therefore, it is possible to give information with excellent readability.

  Because of these effects, the present invention performs actions such as reading invisible information given to valuable prints such as securities, various certificates and important documents with a digital device and stopping the operation of the digital device based on the information. It is effective for starting.

It is the figure in which the color separation image which consists of subtractive color mixture in the full color printed matter was shown. FIG. 3 is a diagram illustrating a line configuration of a general cyan image C and a magenta image M. FIG. 3 is a diagram illustrating a line configuration of a general yellow image Y. FIG. 5 is a diagram illustrating a state in which a cyan image, a magenta image, and a yellow image are printed on a base material with respective color inks and reconstructed on a printed material. FIG. 5 is a diagram showing an RGB image of a general print image and an FFT pattern in frequency analysis thereof. It is the figure which showed the RGB pattern of the printed image of this invention, and the FFT pattern in the frequency analysis. FIG. 3 is a partially enlarged view showing the image line configuration of one yellow image and a partially enlarged view showing the image line configuration of the other yellow image in the present invention. FIG. 5 is a diagram illustrating a state in which a cyan image, a magenta image, and a yellow image are printed on a base material with respective color inks and reconstructed on a printed material. It is the figure in which one printed image in this invention and the FFT pattern in the frequency analysis were shown. It is the figure where the other printed image in this invention and the FFT pattern in the frequency analysis were shown. It is a schematic diagram of the drawing line structure expressed by changing continuously the drawing line width of a concentric circle line. It is the figure where the drawing line structure comprised by the three types of area | region where the center point of each concentric circle line is arrange | positioned equally is shown. It is the figure where the drawing line structure comprised by three types of area | regions where the center point of each concentric circle line is equal and arrange | positioned equally is shown. It is the figure where the drawing line structure comprised by three types of area | regions which the center point P of each concentric circle line differs and has the same area | region area is shown. It is the figure where the drawing point structure comprised by three types of area | regions where the center point P of each concentric circle line is equal and is arrange | positioned at ring shape is shown. It is a block diagram of a manufacturing apparatus in the present invention. It is the flowchart in which the preparation process step in this invention was shown. It is a block diagram of the authentication apparatus in this invention. It is the flowchart in which the authentication process step in this invention was shown. It is a data table in which information to be embedded is registered.

  Embodiments of the present invention will be described below in detail with reference to the drawings based on examples. FIG. 1 shows a color separation image composed of subtractive color mixture in a full-color printed product. The full color representation of general commercial printing and color printers is formed by color images based on subtractive color mixing. The original image 1 is a 24-bit RGB color image having a resolution of 400 dpi of 21.7 mm × 21.7 mm. A cyan image C, a magenta image M, and a yellow image Y based on subtractive color mixing are formed on the original image 1 by a known color separation method called process color separation. In the normal process color separation, a black image is also formed. However, in the embodiment for carrying out the present invention, the black image is omitted.

  The cyan image C, the magenta image M, and the yellow image Y having continuous tone shown in FIG. 1 are image lines in an assembly of fine components, also called dot patterns (or halftone dots), so as to have a configuration suitable for printing. By changing the area ratio continuously, the shade of each color image is expressed. Dot patterning of an image is generally called screening. Today, dot patterning of an image by a dot pattern is generally performed through a plate making apparatus incorporating image processing called a dot generator. FIG. 2 shows image line configurations of the cyan image C and the magenta image M. FIG. 2A is a partially enlarged view (in a circle) showing the image line structure of a cyan image, and FIG. 2B is a partially enlarged view (in a circle) showing the image line structure of a magenta image. . Both the dot pattern of the cyan image and the magenta image have a screen line number of 210 lines / inch, and the angle of the dot pattern array is changed in order to prevent moiré during overprinting. It is called. Here, the cyan image C in FIG. 2A is set to 108 degrees, and the magenta image M in FIG. 2B is set to 162 degrees. FIG. 3 shows the image line structure of the yellow image Y. FIG. 3A is a partially enlarged view (in a circle) showing the image line structure of the yellow image Y. FIG. The dot pattern is the same as that in FIG. 2, and the screen line number is 210 lines / inch and the screen angle is 90 degrees. In normal process printing, a full-color image is formed by printing an image having the image line configuration shown in FIGS. 2 and 3A on a substrate with each color ink.

On the other hand, FIG. 3B is a partially enlarged view (in a circle) showing the image line structure of the yellow image Y1. Yellow image Y1 is equal to the continuous tone of the yellow image Y in FIG. 3 (a), unlike the dot pattern of image line structure yellow image Y, regions arranged in concentric line screen consisting distance d ₁ of 80μm A. Although FIG. 3 (b) is described as being formed with concentric circles, the present invention is not limited to this, and any concentric lines such as concentric angular lines may be used. Embodiments 1 to 5 shown below may be concentric lines. However, concentric circles are preferable. The line area ratio of the yellow image Y1 is expressed by continuously changing the line widths of the concentric circle lines. A method for continuously changing the line widths of concentric lines will be described in the first embodiment.

  FIG. 4 is a diagram showing a state in which a cyan image, a magenta image, and a yellow image are printed on a base material with respective color inks and reconstructed on a printed material. FIG. 4A shows the cyan image shown in FIG. 2A, the magenta image shown in FIG. 2B, and the yellow image Y shown in FIG. A printed image 2 obtained by being overprinted on the material is shown. On the other hand, FIG. 4A shows a cyan image shown in FIG. 2A, a magenta image shown in FIG. 2B, and a yellow image Y1 shown in FIG. The printed image 3 obtained by printing on the base material is shown.

  FIG. 5 shows the RGB image of the print image 2 and the FFT pattern in the frequency analysis thereof. The printed image 2 shown in FIG. 4A is input with a resolution of 1200 dpi by an optical scanner, and a 24-bit RGB image consisting of 1024 × 1024 pixels shown in FIG. 5A is generated. . FIG. 5B is an FFT pattern obtained by Fourier transforming the B channel in the RGB image shown in FIG. In addition, in order to explain the feature of the spatial frequency in an easy-to-understand manner, a frequency intensity graph is superimposed and displayed in the fourth quadrant of the FFT pattern in FIG. In the image line formed in the print image 2 in FIG. 5A, no significant feature is seen in the spatial frequency.

FIG. 6 shows the RGB image of the print image 3 and the FFT pattern in the frequency analysis thereof. The print image 3 shown in FIG. 4B is input with a resolution of 1200 dpi by an optical scanner, and a 24-bit RGB image consisting of 1024 × 1024 pixels shown in FIG. 6A is generated. . The area A of the yellow image on the printed material shown in FIG. 3B is arranged with concentric circles having an interval d _{1 of} 80 μm, and the concentric circles constituting the area A are thin lines and have high brightness. Since it is printed in yellow, it cannot be visually recognized that it is composed of concentric circles. Furthermore, since the cyan image C and the magenta image M having low brightness are simultaneously overprinted, they become a camouflage pattern, and the concentric circles constituting the area A are not visually recognized. The cyan image C and the magenta image M are formed by a group of image lines having a shape different from that of the concentric circles composed of frequency components different from the frequency components of the concentric circles forming the yellow image. FIG. 6B is an FFT pattern obtained by Fourier transforming the B channel in the RGB image shown in FIG. Similarly to FIG. 5, in order to explain the feature of the spatial frequency in an easy-to-understand manner, a frequency intensity graph is superimposed on the fourth quadrant of the FFT pattern of FIG. 6B. As shown in frequency intensity graph of FIG. 6 (b), inverse spatial distance q _d1 intensity peaks are observed. This is what the distance d ₁ that shown in FIG. 3 (b) appeared on the reciprocal space. With respect to the inverse spatial distance of the intensity peak on the FFT pattern, various parameters relating to image input, that is, when the interval d ₁ of 80 μm provided in the area A on the printed material shown in FIG. If the number of pixels on one side of the image and the resolution of the image are known, the calculation can be easily performed using equation (1).

Since the RGB image in FIG. 6A includes the region A shown in FIG. 3B, the inverse spatial distance q _{d1 of the} intensity peak caused by the interval d ₁ between the lines of the concentric circles in the region A is provided. Appears at a position of 271 pixels from the center of the FFT pattern as shown in FIG.

FIG. 7A is a partially enlarged view (in a circle) showing the image line structure of the yellow image Y2. Yellow image Y2 is equal to the continuous tone of the yellow image Y in FIG. 3 (a), unlike the dot pattern of image line structure yellow image Y, regions arranged in concentric line screen consisting distance d ₁ of 80μm A and a region B arranged by concentric circles having a distance d _{2 of} 100 μm. On the other hand, FIG. 7B is a partially enlarged view (in a circle) showing the image line structure of the yellow image Y3. Yellow image Y3 is equal to the continuous tone of the yellow image Y in FIG. 3 (a), unlike the dot pattern of image line structure yellow image Y, are arranged in a concentric line screen consisting distance d ₁ of 80μm area A, a region B arranged with concentric circles having a spacing d _{2 of} 100 μm, and a region C arranged with concentric circles having a spacing d _{3 of} 130 μm. The line area ratios of the yellow image Y2 and the yellow image Y3 are expressed by continuously changing the line widths of the concentric circles. A method for continuously changing the line widths of concentric lines will be described in the first embodiment. Moreover, there is no restriction | limiting in the arrangement | positioning of each area | region, The position of the center of a concentric circle line may be different.

  FIG. 8 is a diagram showing a state in which a cyan image, a magenta image, and a yellow image are printed on a base material with respective color inks and reconstructed on a printed material. FIG. 8A shows the cyan image shown in FIG. 2A, the magenta image shown in FIG. 2B, and the yellow image Y2 shown in FIG. A printed image 4 obtained by being overprinted on the material is shown. On the other hand, FIG. 8B shows the cyan ink shown in FIG. 2A, the magenta image shown in FIG. 2B, and the yellow image Y3 shown in FIG. The printed image 5 obtained by overprinting on the substrate is shown.

FIG. 9 shows the printed image 4 and the FFT pattern in the frequency analysis thereof. The printed image 4 shown in FIG. 8A is input with a resolution of 1200 dpi by an optical scanner, and a 24-bit RGB image consisting of 1024 × 1024 pixels shown in FIG. 9A is generated. . The area A of the yellow image on the printed material shown in FIG. 7A is arranged with concentric circles having an interval d _{1 of} 80 μm, and the area B is arranged with concentric circles having an interval d _{2 of} 100 μm. The concentric circles constituting the regions A and B are printed with a fine line and yellow with high brightness, so that it cannot be visually recognized that they are composed of concentric circles. Furthermore, since the cyan image C and the magenta image M having low brightness are simultaneously overprinted, they become a camouflage pattern, and the concentric circles constituting the regions A and B are not visually recognized. The cyan image C and the magenta image M are formed by a straight line, a curved line, and / or a dot pattern (halftone dot) composed of frequency components different from the frequency components of the concentric circles forming the yellow image. FIG. 9B is an FFT pattern obtained by performing Fourier transform on the B channel in the RGB image shown in FIG. Similarly to FIG. 5, in order to explain the feature of the spatial frequency in an easy-to-understand manner, a frequency intensity graph is superimposed on the fourth quadrant of the FFT pattern of FIG. 9B. As shown in the frequency intensity graph of FIG. 9B, the inverse spatial distance q _d1 and the inverse spatial distance q _d2 of the intensity peak can be seen.

As shown in the calculation of Equation 1, since the RGB image in FIG. 9A includes the area A shown in FIG. 7A, the interval between the lines of concentric lines in the area A is as follows. The inverse spatial distance q _d1 of the intensity peak caused by d ₁ appears at a position of 271 pixels from the center of the FFT pattern, as shown in FIG. 9B. Furthermore, since the RGB image shown in FIG. 9 (a) also includes region B shown in FIG. 7 (a), the inverse of the intensity peaks resulting spacing d ₂ of streaking concentric parallel line provided in the region B The spatial distance _qd2 appears at a position of 217 pixels from the center of the FFT pattern as shown in FIG. 9B.

On the other hand, the print image 5 shown in FIG. 8B is inputted with a resolution of 1200 dpi by an optical scanner, and a 24-bit RGB image consisting of 1024 × 1024 pixels shown in FIG. 10A is generated. Is done. The area A of the yellow image on the printed material shown in FIG. 7B is arranged by concentric circles having an interval d _{1 of} 80 μm, and the area B is arranged by concentric circles having an interval d _{2 of} 100 μm. , region C are arranged in concentric line screen consisting distance d ₃ of 130 .mu.m, the area a, the concentric parallel line constituting the region B and the region C subfraction lines and visually because that is printed in high lightness yellow Then, it cannot be visually recognized that it is composed of concentric circles. Furthermore, since the cyan image C and the magenta image M having low brightness are simultaneously overprinted, they become a camouflage pattern, and the concentric circles constituting the regions A, B, and C are not visually recognized. The cyan image C and the magenta image M are formed by a straight line, a curved line, and / or a dot pattern (halftone dot) composed of frequency components different from the frequency components of the concentric circles forming the yellow image. FIG. 10B is an FFT pattern obtained by Fourier transforming the B channel in the RGB image shown in FIG. Similarly to FIG. 5, in order to explain the feature of the spatial frequency in an easy-to-understand manner, a frequency intensity graph is superimposed on the fourth quadrant of the FFT pattern in FIG. As shown in the frequency intensity graph of FIG. 10B, the inverse spatial distance q _d1 , inverse spatial distance q _d2, and inverse spatial distance q _d3 of the intensity peak can be seen.

As shown in Equation 1, since the RGB image in FIG. 10 (a) includes the area A shown in FIG. 7 (b), the interval between the lines of concentric lines in the area A is as follows. The inverse spatial distance q _d1 of the intensity peak caused by d ₁ appears at a position of 271 pixels from the center of the FFT pattern as shown in FIG. Furthermore, since the RGB image shown in FIG. 10 (a) also includes region B shown in FIG. 7 (b), the inverse of the intensity peaks resulting spacing d ₂ of streaking concentric parallel line provided in the region B The spatial distance q _d2 appears at a position of 217 pixels from the center of the FFT pattern as shown in FIG. Furthermore, because it contains also a region C shown in FIG. 7 (b) in the RGB image of FIG. 10 (a), the intensity peaks resulting interval d ₃ streaks concentric parallel line provided in the region C The inverse spatial distance q _d3 appears at a position of 167 pixels from the center of the FFT pattern as shown in FIG.

  Thus, by including concentric circles in an arbitrary region, the characteristics of the spatial frequency of the concentric circles are shown as intensity peaks in the FFT pattern. Note that the position of the intensity peak varies depending on the interval between the drawing lines of the concentric circles. The difference in the pattern can be identified as information by the difference in the position of the intensity peak in the FFT pattern.

  Thus, by including a concentric circle in a region having a high lightness color element, the spatial frequency of the concentric circle that is camouflaged by another region having a low lightness color element and emphasized by a specific color filter These features are shown as intensity peaks in the FFT pattern. Note that the position of the intensity peak varies depending on the interval between the drawing lines of the concentric circles. The difference in pattern can be identified by the difference in the position of the intensity peak in this FFT pattern. In addition, as long as the area | region which has a color element with high lightness, and the other area | region which has a color element with low lightness satisfy | fill the conditions that a hue differs, each color will not be limited at all.

  In the above description, concentric lines are formed on the yellow image, which is the predetermined color element with the highest brightness, and dot patterns are formed on the cyan image and magenta image, which are the remaining pigments. Without being limited to the above configuration, a predetermined color element having the highest brightness among a plurality of color elements is extracted, and a frequency component corresponding to information to be embedded in an image composed of the predetermined color elements is extracted. The concentric circles having a predetermined set interval may be arranged, and the image formed from the remaining dye may be formed by at least one region in which the image line group having a shape different from that of the concentric circles is arranged. The image line group in which the image composed of the remaining dyes has a shape different from that of the concentric circles is preferably formed by at least one of a direct image line and a dot pattern. Moreover, it is preferable that the space | interval of the drawing line of a concentric circle line is 50 micrometers-350 micrometers. The same applies to the printed matter of the first to third embodiments described below that can determine authenticity.

  In the printed matter capable of determining authenticity of the present invention, the interval between the lines of concentric circles is selected from a plurality of preset intervals for each piece of information to be embedded. For example, as shown in the data table of FIG. 20, Code 1 is applied as data for obtaining the FFT pattern shown in FIG. 6B, and the FFT pattern shown in FIG. Code 2 is applied as data for obtaining, and Code 3 is applied as data for obtaining the FFT pattern shown in FIG. The more information that should be embedded in this data table is registered, the more information for authenticity determination can be utilized.

  The present invention has a concentric line in the area of surface expression, that is, a plurality of fine lines having regularity, so that it can be identified in a high-resolution input image by a digital device such as a scanner or a copying machine. By adding fine and regular parts that are difficult for humans to visually recognize, analyzing the correlation of the intervals between line drawings for securities on the digital device, and identifying the information embedded in the printed material The authenticity can be determined, and an action such as operation stop of a digital device such as a copying machine used for counterfeiting can be performed based on the information.

(1) Embodiment 1
In the first embodiment, the relationship between concentric circles and continuous gradation will be described. The first embodiment will be described in detail with reference to the drawings.

In the above description, the present invention provides arbitrary information by including concentric circles in a region having color elements with high brightness. At the same time, an area having a color element with high brightness is a part of the color elements constituting the print image line and has an image line structure with continuous gradation. For example, the line area ratios of the yellow image Y1 shown in FIG. 3B, the yellow image Y2 shown in FIG. 7A, or the yellow image Y3 shown in FIG. It is expressed by continuously changing the line width of the line. The features common to these are as shown in the schematic diagram of the drawing line configuration in FIG. 11, while the distance d ₁ between the center lines L1 to L3 of the concentric circles in the region A is always kept the same distance, and the center lines L1 to L1 are maintained. A distance is set so that the image line area has a predetermined image area ratio inside and outside L3. The state where the line area ratio is 100% means that the line width of the concentric circle lines is the same as the interval d ₁ of the concentric circle lines. That is intended to refer to a streaking area of each spread from the center line of each image line by 50% in distance d ₁ to the inside and outside (100% by combining the inside and outside) in concentric ten thousand lines.

For example, if the image line area is 25%, keeping the same distance _{d 1} to the respective center lines L1 to L3, to 12.5% of the distance _{d 1} to the inside and outside (25% combined inner and outer) The area is expanded. Further, if the image line area is 50%, maintaining the same distance _{d 1} to the respective center lines L1 to L3, and spread to the inside and outside to 25% of the distance _{d 1} (50% by combining the inside and outside) The stroke area is assumed. Further, if the image line area is 75%, maintaining the same distance _{d 1} to the respective center lines L1 to L3, to 37.5% of the distance _{d 1} to the inside and outside (75% combined inner and outer) The area is expanded. Thus, what streaked distance d ₁ in the area ratio is kept constant, can be understood clearly the characteristics of the spatial frequency from the FFT pattern obtained by Fourier transform. The feature of the spatial frequency can be clarified when the image area ratio is 5% to 95%. In other words, it is desirable to keep the circle of the printed image line as continuous as possible.

(2) Embodiment 2
In the second embodiment, the shape of the region including the concentric circles and the position of the concentric circles will be described. The second embodiment will be described in detail with reference to the drawings.

FIG. 12 includes three types of regions. Basically, the configuration is the same as that of the yellow image Y3 shown in FIG. Yellow image in FIG. 7 (b) Y3 is, 80 [mu] m and an area A disposed concentric line screen consisting distance _{d 1} of the region B arranged in a concentric line screen consisting distance _{d 2} of 100 [mu] m, distance 130μm It is constituted by a region C that are arranged in a concentric line screen consisting of d _3. As shown in the schematic diagram of FIG. 12, the center points P of the concentric circles of regions A, B, and C are equal, and regions A and B are arranged on the left side of the drawing, respectively. C is arranged. Even in this case, the characteristics of the spatial frequencies of the regions A, B, and C can be clearly identified.

Further, FIG. 13 is composed of three types of regions, similar to the schematic diagram of FIG. 12, and similarly to the yellow image Y3 of FIG. 7B, a region A arranged by concentric circles having an interval d _{1 of} 80 μm. And a region B arranged with concentric circles having a spacing d _{2 of} 100 μm and a region C arranged with concentric circles having a spacing d _{3 of} 130 μm. As shown in the schematic diagram of FIG. 13, the center points P of the concentric circles of the regions A, B, and C are equal, and the regions A, B, and C are the centers of the concentric circles. The points P are equally divided into three equal parts. Even in this case, the characteristics of the spatial frequencies of the regions A, B, and C can be clearly identified.

  That is, in the printed matter using the concentric circle lines shown in FIGS. 12 and 13, the region where the concentric circles are arranged is divided into a plurality of regions, and each of the divided regions has the same center point. A common concentric circle is formed, and the interval between the lines of the concentric circles in each of the divided regions is different for each region.

Further, FIG. 14 is composed of three types of regions, as in the schematic diagrams of FIGS. 12 and 13, and is arranged in concentric circles having an interval d _{1 of} 80 μm, as in the yellow image Y3 of FIG. 7B. Region A, a region B arranged with concentric circles having a spacing d _{2 of} 100 μm, and a region C arranged with concentric circles having a spacing d _{3 of} 130 μm. As shown in the schematic diagram of FIG. 14, the center points P of the concentric circles of the regions A, B, and C are different, and the regions A, B, and C have the same region area. Are arranged. Even in this case, the characteristics of the spatial frequencies of the regions A, B, and C can be clearly identified.

  That is, in the printed matter using the concentric circle lines shown in FIG. 14, the region where the concentric circles are arranged is divided into a plurality of regions, and each of the divided regions has a different center point for each region. Thus, concentric circles are formed, and the interval between the lines of the concentric circles in each of the divided regions is different for each region.

Incidentally, FIG. 12, each of the regions shown in the schematic diagram of FIG. 13 and FIG. 14, as shown in the first embodiment, the center of each individual streaked range intervals d ₁ of concentric parallel line Continuous gradation is expressed by continuously changing the line width from the line.

(3) Embodiment 3
The third embodiment describes a positional relationship in which a plurality of regions are arranged in a ring shape, and the concentric circles provided in each region have natural continuity at the boundary between the regions. is there. The third embodiment will be described in detail with reference to the drawings.

Since the concentric circles provided in the region in the present invention are printed with a color ink having high brightness such as yellow, even if the entire continuous tone can be visually recognized by the naked eye, the shape of the image line cannot be identified. However, it can be further prevented from being identified by the positional relationship of the image lines. FIG. 15 looks like a concentric circle formed at the same distance from the center point P, but in reality, it is constituted by three types of regions as in the schematic diagrams of FIGS. 12, 13 and 14. . As with the yellow image Y3 of FIG. 7 (b), a region A arranged in concentric line screen consisting distance _{d 1} of 80 [mu] m, and the region B arranged in a concentric line screen consisting distance _{d 2} of 100 [mu] m, the 130μm It is constituted by a region C that are arranged in a concentric line screen consisting distance d _3.

In the schematic diagram of FIG. 15A, the center points P of the concentric circles of the regions A, B, and C are equal, and the center point P, the region A, the region B, and the region C are arranged in a ring shape in this order. It is a thing. First, the region A is a concentric circle formed at a distance d ₁ from the center point P. Outside the region A, interpolation interval X ₁ consisting of the average value of the distance d ₂ between concentric parallel line spacing d ₁ and the region B of concentric parallel line region A is a region B provided are arranged in a ring. Region B is a concentric line screen formed with a spacing d _2. Outside the region B, region C interpolation interval X ₂ is provided consisting of the average value of the distance d ₂ and spacing d ₃ concentric parallel line region C concentric parallel line area B are arranged in a ring. Region C is a concentric line screen formed with a spacing d _3.

On the other hand, in the schematic diagram of FIG. 15B, the center points P of the concentric circles of the regions C, B, and A are equal, and the center C, the region C, the region B, and the region A are ring-shaped in this order. It is arranged. First, the region C is a concentric circle formed with a distance d ₃ from the center point P. Outside the region C, an interpolation interval X ₂ consisting of an average value of the interval d ₃ between concentric circles in the region C and the interval d ₂ between concentric circular lines in the region B is provided, and the region B is arranged in a ring shape. Region B is a concentric line screen formed with a spacing d _2. Outside the region B, an interpolation interval X ₁ consisting of an average value of the interval d ₁ between the concentric circles in the region A and the interval d ₁ between the concentric circles in the region A is provided, and the region A is arranged in a ring shape. Region A is a concentric circle formed with a distance d ₁ .

  As a result, in the image line configurations of FIGS. 15A and 15B, the regions A, B, and C are arranged in a ring shape in order, but concentric circles are naturally formed at the boundaries of the regions. Continuity is maintained. Also, the image line configurations in FIGS. 15A and 15B are the same, and the spatial frequency characteristics of the regions A, B, and C can be clearly identified.

Incidentally, each of the regions shown in the schematic diagram of FIG. 15 (a) and 15 Figure 15 (b) as shown in the first embodiment, each individual picture in a range of distance d ₁ of the concentric parallel line Continuous gradation is expressed by continuously changing the line width from the center line of the line.

  That is, in the printed matter using the concentric circle lines in FIG. 15, the region where the concentric circles are arranged is divided into a plurality of rings, and each of the divided regions has the same center point. A common concentric circle is formed, and at the boundary of each of the divided areas, an average value of the interval between the concentric circles provided in one adjacent region and the interval between the concentric circles provided in the other region An interpolation area is provided, and continuity of concentric circles is maintained at the boundary.

(4) Embodiment 4
In the above description, as described in the first to third embodiments, the present invention gives predetermined information to be embedded to a continuous tone image. An apparatus and a manufacturing method will be described.

  As shown in the block diagram of FIG. 16, the manufacturing apparatus according to the fourth embodiment includes a color image input unit M1, an information input unit M2, an output unit M3, a display unit M4, an editing unit M5, a format database M6, and a communication interface. M7 is provided. The editing unit M5 includes a color separation unit M5a, an information embedding unit M5b, and an image composition unit M5c.

  The color image input unit M1 receives a color image that is a motif of a printed image of a printed matter that can be determined as authentic. The color image input means M1 is a camera, a digital camera, a scanner, or the like, and is not particularly limited. Visible information can be obtained from a personal information database in which personal information registered in the same personal computer as a format database to be described later is input, an external database server in which personal information is input in advance through a communication interface, or the like.

  The information input means M2 inputs information on concentric lines having a predetermined interval set so that frequency components corresponding to information to be embedded are extracted. For example, an input from a keyboard or the like, a database (not shown) in which information registered in the same personal computer as a format database M6 described later is input, and information to be embedded predetermined by a communication interface are input. Information can be obtained from an external database server (not shown). Note that a database in which information registered in the same personal computer is input is provided in storage means (not shown), and has a predetermined interval set so that frequency components corresponding to information to be embedded are extracted. Information on concentric lines is stored.

  The output means M3 writes out a plurality of document files that can be held as color channels, or the document file is printed on a substrate with a predetermined color ink and output. The format of the document file is not particularly limited.

  The display means M4 is not particularly limited, such as a personal computer monitor or a dedicated monitor.

  The color separation unit M5a color-separates the color image obtained by the color image input unit M1 into printable predetermined color channels, and divides the predetermined color channel into the color element having the highest brightness and the remaining pigment.

  The information embedding unit M5b stores information on concentric lines having a predetermined interval set so that a frequency component corresponding to information to be embedded in a predetermined color element having the highest brightness obtained by color separation of the color image is extracted. Concentric circular line data is generated by the information input means M2, and at least one image line group data different from the concentric circular line is generated for the remaining pigment.

  The image synthesizing unit M5c generates a document file by synthesizing the concentric circle line data set for a predetermined color element having the highest brightness and at least one line group data set for the remaining pigment. For example, the document file is generated by combining the concentric circle line data in which the color element having the highest lightness is the yellow component, the image line group data of the magenta component and the image line group data of the cyan component are the remaining pigments.

  The format database M6 stores necessary data in addition to the color image input means M1 and the information input means M2. Specifically, for example, a card mount pattern is sent to the editing unit M5, and is synthesized with the print image 3, the print image 4, or the print image 5 by the image synthesis unit M5c.

  The communication interface M7 is RS-232C, IEEE1394, or the like, and is not particularly limited.

  The manufacturing method according to the present embodiment is executed by the processing steps shown in the flowchart of FIG. 17 using the manufacturing apparatus shown in FIG.

  First, in step f1, the color image input means M1 inputs an RGB color image that is a motif of a printed image of a printed matter that can be determined as authenticity of the present invention. A bitmap multi-valued image is input, and there is no limitation on the number of pixels. Further, the color separation of the color image shown in step f3 is performed by the color separation means M5a included in the editing means M5 shown in FIG. In step f3, the color image input by the color separation means M5a is color-separated into predetermined color channels that can be printed, and the predetermined color channel is divided into color elements having the highest brightness and the remaining pigments.

  On the other hand, in step f2, information on concentric circles having a predetermined interval set so that a frequency component corresponding to information to be embedded is extracted by the information input means M2 is input. For example, the input information is input from a keyboard or the like, a database (not shown) in which information registered in the same personal computer as the format database M6 is input, or an external in which information is input in advance by a communication interface Information can be obtained from a database server (not shown). Note that a database in which information registered in the same personal computer is input is provided in storage means (not shown), and has a predetermined interval set so that frequency components corresponding to information to be embedded are extracted. Information on concentric lines is stored.

  Further, by the information embedding unit M5b included in the editing unit M5 shown in FIG. 16, in step f4, at least one line group data different from the concentric circles is generated for the remaining pigment. For example, generation of dot patterns having different screen angles for a cyan image and a magenta image, and in step f5, concentric circle line data is generated for a predetermined color element having the highest brightness. For example, a concentric line pattern for a yellow image defined by the input information to be embedded is generated.

  Next, in steps f6 to f8, each channel is output to a predetermined color element having the highest brightness obtained by the color separation in step f3 and the remaining pigment. Next, in Steps f9 to 11, each channel output produced in Steps f6 to 8 is applied to the dot pattern. For example, the cyan image is output to the cyan channel of the document file in step f6, and the magenta image obtained by the color separation in step f3 is output to the magenta channel of the document file in step f7. The yellow image obtained by f3 color separation is output to the yellow channel of the document file in step f8.

  Then, the dot pattern for the cyan image obtained in step f4 is applied to the cyan channel in step f9, and the dot pattern for the magenta image is applied to the magenta channel in step f10. Further, the concentric pattern for the yellow image obtained in step f5 is applied to the yellow channel in step f11.

  Next, the image synthesizing unit M5c included in the editing unit M5 shown in FIG. 16 uses the concentric line data set for the predetermined color element with the highest brightness and at least one image set for the remaining pigment. A document file is generated by combining line group data. For example, the channels are combined at step f12 and written to the document file at step f13. The document file generated in this way is printed on the base material with the respective color inks, so that a color printed matter in which information is embedded can be obtained.

(5) Embodiment 5
As described in the first to third embodiments, the present invention provides information to a continuous tone image. In the fifth embodiment, an authentication apparatus and an authentication method will be described. .

  A printed matter authentication apparatus according to the fifth embodiment will be described. As shown in FIG. 18, this apparatus includes a reading means M8 comprising an optical scanner, an input means M9 comprising an operation panel, a display means M10 comprising a CRT, a liquid crystal panel, a printer, etc., a communication interface M11, a storage means. M13 is further provided with a calculation means M12 having a color separation means M12a, a conversion means M12b, an analysis means M12c, and a determination means M12d.

  The calculation means M12 performs all the calculations necessary for the authenticity determination process, and includes a color separation means M12a, a conversion means M12b, an analysis means M12c, and a determination means M12d. The calculation means M12 is connected to the storage means M13, the communication interface M11, the reading means M8, the input means M9, and the display means M10. The color separation unit M12a extracts a gray scale image of a color element having the highest brightness from the read color image. For example, a gray scale image of a yellow component is extracted from a color image. The conversion means M12b performs an Fourier transform on the extracted gray scale image to generate an FFT pattern. The analysis unit M12c extracts a frequency component from the FFT pattern. The determination unit M12d authenticates the printed matter that can be determined by comparing and comparing the frequency component and the authenticity determination data stored in the storage unit.

  The reading unit M8 acquires, as a color image, a print image that is printed on a printed material that can be checked for authenticity and in which predetermined information to be embedded is embedded.

  The read color image is transferred to and stored in the storage unit M13 via the calculation unit M12.

  The input means M9 inputs data necessary for authenticity determination processing and transfers the data to the calculation means M12.

  The display unit M10 displays the data input to the input unit M9, the result of the authenticating unit M12 performing authenticity determination, and the like.

  The communication interface M11 is connected to a computer terminal (not shown) in order to acquire, for example, a reference value related to a genuine printed material when the authenticity determination data is not stored in the storage unit. Also, RS-232C, IEEE 1394, etc. are not particularly limited.

  The storage unit M13 stores authenticity determination data. Further, various data and discrimination results given from the calculation means M12 are stored.

  The authentication method according to the present embodiment is executed by the processing steps shown in the flowchart of FIG. 19 using the authentication apparatus shown in FIG.

  As shown in FIG. 19, in step f14, a print image in which predetermined information to be embedded is embedded is read as a color image (RGB image) by reading means M8 such as a digital camera or an optical scanner. For example, reading is performed as an RGB image with a high resolution of 1200 dpi and an image size of 1024 × 1024 pixels.

  In step f15, the color separation means M12a extracts a grayscale image of the color element having the highest brightness from the read color image (RGB image) in step f14. For example, the B (blue) channel grayscale image is extracted by the color separation means M12a.

  In step f16, the gray scale image (for example, B (blue) channel) extracted in step f15 is Fourier transformed by the converting unit M12b to generate an FFT pattern.

  In step f17, frequency components are extracted from the FFT pattern created in step f16 by the analyzing unit M12c.

  In step f18, the determination unit M12d authenticates the printed material that can be determined by comparing and comparing the extracted frequency component and the authenticity determination data (frequency component) stored in the storage unit.

  Since the frequency component is a component of a region formed by concentric drawing lines, it is possible to extract a frequency component that is clearer than before, so erroneous recognition of a predetermined frequency component in comparison verification There is nothing to do.

1 Original Image 2 Print Image 3 Print Image 4 Print Image 5 Print Image C Cyan Image M Magenta Image Y Yellow Image Y1 Yellow Image Y2 Yellow Image Y3 Yellow Image d ₁ Interval d ₂ Interval d ₃ Interval L1, L2, L3 Centerline M1 Color image input means M2 Information input means M3 Output means M4 Display means M5 Editing means M5a Color separation means M5b Information embedding means M5c Image composition means M6 Format database M7 Communication interface M8 Reading means M9 Input means M10 Display means M11 Communication interface M12 Calculation means M12a Color separation means M12b Conversion means M12c Analysis means M12d Determination means M13 Storage means P center q _d1 inverse spatial distance q _d2 inverse spatial distance q _d3 inverse spatial distance X ₁ interpolation interval X ₂ interpolation interval

Claims (14)

For a print image having a continuous tone composed of a plurality of color elements, a predetermined color element having a high brightness is extracted from the plurality of color elements, and a frequency analysis is performed on the image including the extracted predetermined color element. In this case, it is a printed matter in which the frequency component corresponding to the information to be embedded is extracted and the authenticity determination is possible,
The plurality of color elements have different hues.
Said predetermined concentric shape parallel line having a set predetermined distance so that an image composed of color component frequency component corresponding to information to be embedded the is extracted is formed by at least one region is arranged, the predetermined The line area ratio of the image composed of the color elements is set to a predetermined line area ratio inside and outside each center line of the image line as the line area of the concentric line. The distance between the center lines of the respective image lines is always kept at the same distance, and the image composed of the remaining pigment is at least one region in which image lines having different shapes from the concentric lines are arranged. Formed,
The printed matter capable of authenticating authenticity, wherein the concentric lines and the line area ratios of the line groups having different shapes from the concentric lines are formed according to the continuous tone.   2. The printed matter capable of authenticating authenticity according to claim 1, wherein the interval between the lines of the concentric lines is selected from a plurality of preset intervals for each piece of information to be embedded.   3. The printed matter capable of authenticating authenticity according to claim 1, wherein the predetermined color element having high brightness is a yellow component, and the remaining color elements are a cyan component and a magenta component.   The true / false discrimination according to any one of claims 1 to 3, wherein the image line group having a shape different from that of the concentric line is formed by at least one of a direct image line and a dot pattern. Possible prints. The region where the concentric lines are arranged is divided into a plurality of parts,
Each of the regions divided into a plurality is formed with concentric lines that share the same center point,
It said plurality split interval streaks concentric shape parallel line of each region is, according to claim 1 or authenticity discrimination possible printed matter one claim 4, characterized in different for each said area. The region where the concentric lines are arranged is divided into a plurality of parts,
Each of the divided areas has a central point that is different for each area, and concentric lines are formed.
It said plurality split interval streaks concentric shape parallel line of each region is, according to claim 1 or authenticity discrimination possible printed matter one claim 4, characterized in different for each said area. The region where the concentric lines are arranged is divided into a plurality of rings,
Each of the regions divided into a plurality is formed with concentric lines that share the same center point,
An interpolation region is provided at the boundary of each of the plurality of regions divided by the average value of the interval between the concentric lines in one of the adjacent regions and the interval between the concentric lines in the other region. And
Claims 1 to any one authenticity discrimination possible prints according to 4, characterized in that the continuity of the concentric type parallel line is maintained at the boundary. The printed matter capable of authenticating authenticity according to any one of claims 1 to 7 , wherein the interval between the lines of the concentric lines is 50 µm to 350 µm. A device for producing a printed matter capable of authenticating authenticity according to any one of claims 1 to 8 ,
A color image input means for inputting a color image that is a motif of a printed image of the printed matter capable of authenticating;
Color separation means for color-separating the color image obtained by the color image input means into printable predetermined color channels, and dividing the predetermined color channel into color elements having high brightness and remaining pigments;
Information input means for inputting information of concentric lines having a predetermined interval set so that a frequency component corresponding to the information to be embedded is extracted;
Information on concentric lines having a predetermined interval set so that a frequency component corresponding to information to be embedded in a predetermined color element having a high lightness obtained by color separation of the color image is extracted by the information input means. Information embedding means for generating concentric line data and generating at least one line group data different from the concentric line in the remaining pigment;
Image synthesizing means for generating a document file including concentric line data set in the predetermined color element having high brightness and at least one line group data set in the remaining pigment;
An apparatus for producing a printed matter capable of authenticating authenticity, comprising output means for outputting the document file by printing it on a substrate with a predetermined color ink. 10. The printed material production apparatus according to claim 1, comprising a color image input unit, a color separation unit, an information input unit, an information embedding unit, an image synthesis unit, and an output unit. 10. A method for producing a printed matter that can be distinguished
A step of inputting, by the color image input means, a color image that is a motif of a printed image of the printed matter capable of authenticating;
Separating the inputted color image into predetermined printable color channels by the color separation means, and dividing the predetermined color channel into color elements having high brightness and remaining pigments;
Inputting information of concentric lines having a predetermined interval set so that a frequency component corresponding to information to be embedded is extracted by the information input means;
The information embedding means generates concentric line data for the predetermined color element having the high brightness from the extracted information, and at least one line group data different from the concentric line for the remaining pigment. A step of generating
A step of generating a document file including concentric line data set for the predetermined color element having high brightness and at least one line group data set for the remaining pigment by the image synthesis means; When,
A method of producing a printed matter capable of authenticating authenticity, comprising the step of outputting the document file by printing on a base material with a predetermined color ink by the output means. 11. The method of producing a printed matter capable of authenticating authenticity according to claim 10 , wherein the color element having high brightness is a yellow component, and the remaining pigment is a magenta component and a cyan component.
An authentication device for printed matter capable of authenticating authenticity according to any one of claims 1 to 8 ,
Reading means for reading a print image embedded with information to be embedded in advance as a color image;
Color separation means for extracting a grayscale image of a color element having high brightness from the read color image;
Transform means for generating an FFT pattern by Fourier transforming the extracted grayscale image;
Analyzing means for extracting a frequency component from the FFT pattern;
Storage means for storing authenticity determination data;
Authentication of printed matter capable of authenticating authenticity, comprising: determination means for authenticating printed matter capable of authenticating authenticity by comparing and comparing the frequency component and authenticity determination data stored in the storage means apparatus. The authenticity can be determined according to any one of claims 1 to 8 , using an authentication device for a printed matter including a reading unit, a color separating unit, a converting unit, an analyzing unit, a determining unit, and a storage unit. A method for authenticating printed materials,
A step of reading, as a color image, a print image in which predetermined information to be embedded is embedded by the reading unit;
Extracting a grayscale image of color elements having high brightness from the read color image by the color separation means;
A step of Fourier transforming the extracted grayscale image by the conversion means to generate an FFT pattern;
Extracting frequency components from the FFT pattern by the analyzing means;
The determination means authenticates a printed material that can be determined by comparing and comparing the extracted frequency component and the authenticity determination data stored in the storage means. To authenticate printed materials. 14. The method for authenticating printed matter capable of authenticating authenticity according to claim 13, wherein the color element having high brightness is a yellow component.

Images