JP2014120929A - Method of inspecting forgery preventing medium and forgery preventing medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable enhancement of forgery resistance.SOLUTION: The forgery preventing medium of an embodiment includes a first image that emits fluorescence with excitation light outside of a visible light band on a substrate, wherein the first image contains a first piece of sub information restored on the basis of predetermined key information.

Description

  Embodiments described herein relate generally to a method for inspecting a falsification preventing medium and a falsification preventing medium.

  Conventionally, media such as securities and certificates include forgery / alteration prevention media equipped with various forgery / alteration prevention technologies in order to improve resistance to forgery / alteration. As one of the techniques for preventing forgery and alteration, there is a digital watermark in which additional information is embedded in a main image that is visible in the visible light band in a state that cannot be visually recognized by human eyes (invisible state). In this digital watermark, additional information is embedded in the main image using the characteristics of high spatial frequency components and color difference components that are difficult for humans to detect.

JP 2009-65364 A

  However, in the prior art, since a digital watermark is embedded in a main image that can be viewed in the visible light band, it may be easily copied due to high performance of a scanner or printer, and it is difficult to determine whether it is genuine or counterfeit. There was a possibility.

  In order to solve the above-described problem, a method for inspecting a forgery / alteration medium according to an embodiment is a method for inspecting a forgery / alteration medium in an inspection apparatus that inspects a forgery / alteration medium to be inspected. In contrast, an irradiation step of irradiating excitation light outside the visible light band for causing the fluorescent material applied to the base material of the forgery / alteration prevention medium to emit fluorescence, and a first emission of fluorescence by the irradiation of the excitation light An imaging step of capturing an image, a restoration step of restoring the first sub information included in the taken first image based on preset key information, and the restored first sub information Determining whether the forgery / alteration preventing medium is true or false based on whether or not is sub-information.

  Further, the forgery / alteration prevention medium of the embodiment includes a first image that emits fluorescence with excitation light outside the visible light band on the base material, and the first image is based on preset key information. First sub information to be restored is included.

FIG. 1 is a front view illustrating a forgery / alteration preventing medium according to the first embodiment. FIG. 2 is a front view illustrating the forgery / alteration preventing medium according to the first embodiment. FIG. 3 is a front view illustrating the forgery / alteration preventing medium according to the first embodiment. FIG. 4 is a conceptual diagram illustrating an apparatus configuration for inspecting a falsification preventing medium. FIG. 5 is a block diagram illustrating a hardware configuration of the inspection apparatus. FIG. 6 is a conceptual diagram illustrating an example of inspection of a forgery / alteration medium according to the first embodiment. FIG. 7 is a flowchart illustrating an example of the operation of the inspection apparatus. FIG. 8 is a front view illustrating a forgery / alteration preventing medium according to the second embodiment. FIG. 9 is a conceptual diagram showing an example of inspection of a forgery / alteration medium according to the second embodiment. FIG. 10 is a flowchart illustrating an example of the operation of the inspection apparatus. FIG. 11 is a flowchart illustrating an example of the operation of the inspection apparatus. FIG. 12 is a flowchart illustrating an example of the operation of the inspection apparatus. FIG. 13 is a front view illustrating a forgery / alteration preventing medium according to the third embodiment. FIG. 14 is a front view illustrating a forgery / alteration preventing medium according to the third embodiment. FIG. 15 is a front view illustrating a forgery / alteration preventing medium according to the third embodiment. FIG. 16 is a front view illustrating a forgery / alteration preventing medium according to a modification of the third embodiment.

  Hereinafter, a method for inspecting a forgery / alteration medium and a forgery / alteration prevention medium according to an embodiment will be described in detail with reference to the accompanying drawings.

(First embodiment)
1 to 3 are front views illustrating the forgery / alteration preventing medium 1 according to the first embodiment. As shown in FIG. 1, the forgery / alteration prevention medium 1 is an identification card or the like, and irradiates a face image 2 of an owner, character information 3 such as ID (Identification Data) to identify the owner, and excitation light. Thus, the fluorescent material 4 that emits fluorescence by excitation light outside the visible light band (for example, ultraviolet rays or infrared rays) is formed on the substrate 5 by printing or the like.

  As shown in FIG. 2, the fluorescent material 4 is formed so as to present a face image 4a (first image) of the same owner as the face image 2 as a visible image when irradiated with excitation light. Specifically, the fluorescent material 4 is printed using fluorescent ink that emits red, green, and blue fluorescence when irradiated with excitation light, and is visually recognized as a color image. In this color image printing method using the fluorescent material 4, the ink used in the inkjet or other printing method is formed as a fluorescent ink using pigments that exhibit red, green, and blue fluorescence emission with excitation light having the same wavelength. For example, it can be realized by using a known technique such as Japanese Patent Application Laid-Open No. 2008-6615 “Self-luminous color image printing method”. Note that the face image 2 and the face image 4a do not have to be face images of the owner or the like, and may be images of a predetermined shape such as symbol marks.

  As shown in FIG. 3, the face image 4a of the fluorescent material 4 includes, for example, Japanese Patent Application Laid-Open No. 9-248935 “Image Recording / Reproduction Device” and Japanese Patent Application Laid-Open No. 2009-65364 “Image processing method, image processing device and Sub-information 4b (first sub-information) such as letters and numbers is embedded by digital watermark using color difference modulation as in the “recorded material”. Specifically, the sub-information 4b is embedded in the face image 4a as an invisible state that cannot be recognized by human vision. After the face image 4a is captured, it is taken into a PC (Personal Computer) or the like, and preset key information is obtained. It is obtained by restoring to the base. Then, by determining whether or not the obtained sub information 4b is a predetermined character or number, it is possible to make a true / false determination.

  Next, an apparatus configuration for inspecting the forgery / alteration preventing medium 1 to be inspected will be described. FIG. 4 is a conceptual diagram illustrating an apparatus configuration for inspecting the falsification preventing medium 1. As shown in FIG. 4, the inspection apparatus 103 includes an irradiation apparatus 100 that emits excitation light for causing the fluorescent material 4 applied to the forgery / alteration prevention medium 1 to emit fluorescence, and light in a wavelength region in which the fluorescent material 4 emits fluorescence. An LP filter 101 (LP: low-pass filter) that transmits light, an imaging device 102 such as a CCD (Charge Coupled Device) image sensor or a CMOS (Complementary Metal Oxide Semiconductor) image sensor that captures light transmitted through the LP filter 101, and an inspection result. A display device 116 for displaying is provided.

  FIG. 5 is a block diagram illustrating a hardware configuration of the inspection apparatus 103. As shown in FIG. 5, the inspection device 103 includes a CPU 110 (Central Processing Unit), a ROM 111 (Read Only Memory), a RAM 112 (Random Access Memory), a storage unit 113, an I / O control unit 114, and a display device 116 on a bus 117. Connected by. The CPU 110 centrally controls the operation of the storage unit 113 by reading the basic program stored in the ROM 111 and the program D1 stored in the storage unit 113, developing the program in the work area of the RAM 112, and sequentially executing the program. The storage unit 113 is a storage device such as an HDD (Hard Disk Drive), and is a preset setting such as a program D1 for executing the inspection of the forgery / alteration prevention medium 1 and key information referred to during the inspection. Information D2 is stored. The I / O control unit 114 connects the operation device 115 such as a keyboard and a mouse that accepts user operations, the irradiation device 100, the imaging device 102, and the CPU 110. Note that the inspection apparatus 103 is incorporated into an automatic teller machine or the like that handles the forgery and alteration prevention medium 1 such as securities even if it is an information device such as a PC (Personal Computer) connected to the irradiation apparatus 100 or the imaging apparatus 102. It may be.

  FIG. 6 is a conceptual diagram illustrating an example of inspection of the forgery / alteration medium 1 according to the first embodiment. As shown in FIG. 6, when inspection is started by accepting a user's operation or the like by the operation device 115 and executing the program D1, the inspection device 103 receives the forgery / alteration prevention medium 1 to be inspected from the irradiation device 100. Is irradiated with excitation light 104. The irradiated excitation light 104 excites the fluorescent material 4 to generate a fluorescent light emission 105 of the face image 4a. The imaging device 102 acquires the fluorescent light emission 105 generated by the fluorescent material 4 through the LP filter 101. After that, the inspection apparatus 103 restores the sub information 4b embedded in the face image 4a from the key information set in advance as the setting information D2.

  FIG. 7 is a flowchart showing an example of the operation of the inspection apparatus 103. As shown in FIG. 7, when the process is started under the control of the CPU 110, the inspection apparatus 103 irradiates the forgery / alteration prevention medium 1 to be inspected with the excitation light 104 from the irradiation apparatus 100 (S1). Next, the inspection apparatus 103 performs an image scan of the forgery / alteration prevention medium 1 when the excitation light 104 is irradiated with the imaging apparatus 102 (S2). That is, in S2, if the forgery / alteration prevention medium 1 to be inspected is a genuine product to which the fluorescent material 4 exhibiting the face image 4a is applied, the face image 4a in a visualized state is captured.

  Next, the inspection apparatus 103 determines whether or not there is a face image 4a (fluorescent image) in the image of the forgery / alteration medium 1 captured in S2 (S3). In S3, it is determined whether or not the face image 4a exists at a predetermined position on the forgery / alteration prevention medium 1. When there is no face image 4a (S3: NO), the inspection apparatus 103 does not form the face image 4a of the fluorescent material 4 on the base material 5 of the forgery / alteration medium 1, and therefore the forgery / alteration prevention medium to be inspected. 1 is determined to be a counterfeit product (S7).

  When there is the face image 4a (S3: YES), the inspection apparatus 103 restores the sub information 4b from the face image 4a using key information preset in the setting information D2 (S4), and whether there is the sub information 4b. It is determined whether or not (S5). Specifically, in S5, it is determined whether or not the restored sub information 4b is regular sub information 4b based on whether or not the restored sub information 4b matches a value set in advance in the setting information D2 or the like. Do.

  When there is the sub information 4b (S5: YES), the inspection apparatus 103 prevents the falsification of the inspection target because the face image 4a of the fluorescent material 4 is formed on the base material 5 so as to include the sub information 4b. It is determined that the medium 1 is a genuine product (S6). If there is no sub information 4b (S5: NO), the inspection apparatus 103 determines that the face image 4a of the fluorescent material 4 is not formed on the base material 5 so as to include the sub information 4b. It is determined that the alteration preventing medium 1 is a counterfeit (S7). The inspection device 103 notifies the user of the determination results of S6 and S7 by screen display on the display device 116 or voice notification from a speaker (not shown), and ends the process.

  As described above, the forgery / alteration prevention medium 1 includes the face image 4a (first image) of the fluorescent material 4 that emits fluorescence with the excitation light 104 outside the visible light band on the substrate 5, and the face image 4a includes Sub information 4b (first sub information) restored based on preset key information is included. The inspection device 103 irradiates the forgery / alteration prevention medium 1 with excitation light 104 outside the visible light band for causing the fluorescent material 4 applied to the base material 5 of the forgery / alteration prevention medium 1 to emit fluorescence. A face image 4 a that emits fluorescence when irradiated with the excitation light 104 is captured. Then, the inspection apparatus 103 restores the sub information 4b included in the captured face image 4a based on preset key information, and the restored sub information 4b is preset as sub information that is set as regular sub information. Whether the forgery / alteration prevention medium 1 is true or false is determined. Therefore, the forgery / alteration prevention medium 1 is not likely to be duplicated easily due to high performance of a scanner or a printer, and can improve the forgery / alteration resistance. Moreover, in the inspection method of the inspection apparatus 103, the authenticity of the forgery / alteration prevention medium 1 described above can be determined.

(Second Embodiment)
Next, a second embodiment will be described. In the second embodiment, the face image 2 under visible light also includes sub-information by digital watermark.

  FIG. 8 is a front view illustrating a forgery / alteration preventing medium 1a according to the second embodiment. As shown in FIG. 8, the face image 2 (second image) in the forgery / alteration prevention medium 1a is similar to the face image 4a by sub-information 2b (first information) such as letters and numbers by digital watermark using color difference modulation. 2 sub-information) is embedded. Similar to the sub information 4b, the sub information 2b is embedded in the face image 2 as an invisible state that cannot be recognized by human vision. After the face image 2 is captured, the sub information 2b is captured in a PC (Personal Computer) or the like, and preset key information. It is obtained by restoring on the basis of Then, by determining whether or not the obtained sub information 2b is a predetermined character or number, it is possible to determine whether it is true or false. Note that the sub information 2b and the sub information 4b may be the same information or different information.

  FIG. 9 is a conceptual diagram showing an example of inspection of the forgery / alteration preventing medium 1a according to the second embodiment. As shown in FIG. 9, in the second embodiment, the excitation light 104 and white light 204 (illumination light in the visible light band) are applied from the irradiation devices 100 and 200 to the base material 5 on which the face image 2 and the fluorescent material 4 are provided. ), And the imaging device 102 captures the face image 2 and the reflected light 205 of the fluorescent material 4. Thereafter, the inspection apparatus 103 restores the sub information 4b embedded in the face image 4a and the sub information 2b embedded in the face image 2 from the key information set in advance as the setting information D2.

  FIG. 10 is a flowchart illustrating an example of the operation of the inspection apparatus 103. As shown in FIG. 10, when the processing is started under the control of the CPU 110, the inspection apparatus 103 sends the excitation light 104 and the white light 204 from the irradiation apparatuses 100 and 200 to the forgery / alteration prevention medium 1a to be inspected. Irradiate (S1b). Next, the inspection apparatus 103 performs an image scan of the forgery / alteration preventing medium 1a during irradiation with the excitation light 104 and the white light 204 with the imaging apparatus 102 (S2).

  Next, the inspection apparatus 103 determines whether or not the face image 4a (fluorescent image) is included in the image of the forgery / alteration medium 1a imaged in S2 (S3). When there is no face image 4a (S3: NO), the inspection apparatus 103 does not form the face image 4a of the fluorescent material 4 on the base material 5 of the forgery / alteration medium 1, and therefore the forgery / alteration prevention medium to be inspected. 1 is determined to be a counterfeit product (S7).

  When there is the face image 4a (S3: YES), the inspection apparatus 103 restores the sub-information 4b from the face image 4a and the sub-information 2b from the face image 2 using key information preset in the setting information D2 (S4b ), Whether there is sub information 4b and sub information 2b is determined (S5). When there is the sub information 4b and the sub information 2b (S5: YES), the inspection apparatus 103 is formed on the base material 5 so that the face image 4a of the fluorescent material 4 includes the sub information 4b, and the face image 2 is sub information. Since it is formed on the base material 5 so as to include 2b, it is determined that the forgery / alteration prevention medium 1a to be inspected is a genuine product (S6).

  When the sub information 4b and the sub information 2b are not present (S5: NO), the inspection apparatus 103 is not formed on the base material 5 so that the face image 4a of the fluorescent material 4 includes the sub information 4b, or the face image 2 Is not formed on the base material 5 so as to include the sub information 2b, it is determined that the forgery / alteration prevention medium 1a to be inspected is a forgery product. The inspection device 103 notifies the user of the determination results of S6 and S7 by screen display on the display device 116 or voice notification from a speaker (not shown), and ends the process.

  As described above, in the forgery / alteration preventing medium 1a, it is possible to perform authenticity determination using not only the sub information 4b included in the face image 4a of the fluorescent material 4 but also the sub information 2b included in the face image 2. Further, the falsification resistance can be improved.

(Modification 1)
FIG. 11 is a flowchart showing an example of the operation of the inspection apparatus 103. More specifically, FIG. 11 is a flowchart showing the operation of the first modification of the second embodiment. As shown in FIG. 11, in the first modification, the sub-information 2b of the face image 2 is restored using the first key information, and the sub-information 4b of the face image 4a is different from the first key information. The point which restores using key information differs from the 2nd embodiment mentioned above.

  Specifically, as shown in FIG. 11, when there is a face image 4a (S3: YES), the inspection apparatus 103 uses the first key information preset in the setting information D2 from the face image 2. The information 2b is restored (S4c), and it is determined whether there is sub information 2b (S5a). When there is no sub information 2b (S5a: NO), the inspection apparatus 103 does not form the face image 2 on the base material 5 so as to include the sub information 2b restored by the first key information. It is determined that the target forgery / alteration prevention medium 1a is a forgery (S7).

  If there is the sub information 2b (S5a: YES), the inspection apparatus 103 restores the sub information 4b from the face image 4a using the second key information preset in the setting information D2 (S4d), and the sub information 4b. It is determined whether or not there is (S5b). When there is no sub information 4b (S5b: NO), the inspection apparatus 103 does not form the face image 4a on the base material 5 so as to include the sub information 4b restored by the second key information. It is determined that the target forgery / alteration prevention medium 1a is a forgery (S7).

  When there is the sub information 4b (S5b: NO), the inspection apparatus 103 is formed on the base material 5 so that the face image 4a of the fluorescent material 4 includes the sub information 4b restored by the second key information. Since the image 2 is formed on the base material 5 so as to include the sub information 2b restored by the first key information, it is determined that the forgery / alteration prevention medium 1a to be inspected is a genuine product (S6). .

(Modification 2)
FIG. 12 is a flowchart showing an example of the operation of the inspection apparatus 103. More specifically, FIG. 12 is a flowchart showing the operation of the second modification of the second embodiment. As shown in FIG. 12, in the second modification, the sub-information 2b of the face image 2 is restored using the first key information, and the sub-information 2b of the face image 4a restored from the face image 2 is used as the key. The point which is restored as information is different from the second embodiment described above.

  Specifically, as shown in FIG. 12, after the sub information 2b is restored from the face image 2 using the first key information preset in the setting information D2, the inspection apparatus 103 has the sub information 2b. Is determined (S5c). When there is no sub information 2b (S5c: NO), the inspection apparatus 103 does not form the face image 2 on the base material 5 so as to include the sub information 2b restored by the first key information. It is determined that the target forgery / alteration prevention medium 1a is a forgery (S7).

  When there is the sub information 2b (S5c: YES), the inspection apparatus 103 uses the sub information 2b as the second key information, and restores the sub information 4b from the face image 4a using the second key information (S4d). Then, it is determined whether there is sub information 4b (S5b). When there is no sub information 4b (S5b: NO), the inspection apparatus 103 does not form the face image 4a on the base material 5 so as to include the sub information 4b restored by the second key information. It is determined that the target forgery / alteration prevention medium 1a is a forgery (S7).

  When there is the sub information 4b (S5b: NO), the inspection apparatus 103 is formed on the base material 5 so that the face image 4a of the fluorescent material 4 includes the sub information 4b restored by the second key information. Since the image 2 is formed on the base material 5 so as to include the sub information 2b restored by the first key information, it is determined that the forgery / alteration prevention medium 1a to be inspected is a genuine product (S6). . In the second modification described above, the restored sub-information 2b is exemplified as the key information used for restoring the sub-information 4b. However, the reverse relationship may be used. Specifically, the sub-information 4b is restored using the second key information preset in the setting information D2, and the sub-information 2b of the face image 2 is restored using the restored sub-information 4b as key information. Good.

(Third embodiment)
Next, a third embodiment will be described. FIGS. 13 to 15 are front views illustrating a forgery / alteration preventing medium 1b according to the third embodiment. As shown in FIG. 13, in the third embodiment, a face image 4a made of a fluorescent material 4 is printed on a face image 2 that is visible under visible light on the forgery / alteration prevention medium 1b.

  Here, the face image 4a to be printed over the face image 2 is transparent in normal time (when the excitation light 104 is not irradiated) so as not to hide the information of the face image 2. Further, the face image 4a is assumed to be a mixed color (for example, white) of at least two kinds of fine dots of red, green, and blue (not to be printed with a single color fluorescent ink). The sub information 4b of the face image 4a and the sub information 2b of the face image 2 are the same information, and the color difference modulation information is in the same state. Therefore, as shown in FIG. 14, under visible light, the sub-information 2b can be acquired by capturing the face image 2 and restoring it with the key information.

  Further, when the forgery / alteration prevention medium 1b is simultaneously irradiated with white light (visible light illumination light) and the excitation light 104, and the face image 2 and the face image 4a on the forgery / alteration prevention medium 1b are captured, When the alteration preventing medium 1b is an authentic product, the sub information 4b of the face image 4a and the sub information 2b of the face image 2 are the same information and the color difference modulation information is in the same state. 2b and 4b can be restored. Here, when the forgery / alteration preventing medium 1b is a forgery, the color difference modulation information is disturbed, so that the sub information 2b, 4b cannot be restored.

  As described above, in the forgery / alteration preventing medium 1b, the face image 4a is printed over the face image 2, and the sub information 4b of the face image 4a and the sub information 2b of the face image 2 are set as the same information. Therefore, whether or not the sub information 2b and 4b can be obtained based on the image captured when the forgery and alteration prevention medium 1b is simultaneously irradiated with the white light (visible light illumination light) and the excitation light 104. By performing the authenticity determination based on the above, the falsification resistance can be improved.

(Modification of the third embodiment)
FIG. 16 is a front view illustrating a forgery / alteration preventing medium 1c according to a modification of the third embodiment. As shown in FIG. 16, in the forgery / alteration prevention medium 1c, when the forgery / alteration prevention medium 1b is simultaneously irradiated with white light (illumination light in the visible light band) and the excitation light 104, the sub-counterfeit prevention medium 1c includes The information 4b is formed so as to inhibit the restoration of at least a part of the sub information 2b included in the face image 2. In the illustrated example, when the face image 2 is imaged under white light and the sub-information 2b is restored, it is reproduced as “ABCDE”, but the face image 4a is formed so as to inhibit “B”.

  Specifically, it is assumed that the sub-information 4b of the face image 4a and the sub-information 2b of the face image 2 are the same information except for the obstructed portion, and the color difference modulation information is in the same state. Further, in the portion “B” to be inhibited, as shown in (enlarged) in the figure, the color difference modulation information 2ba of the face image 2 exemplified in black and white and the color difference modulation information 4ba of the face image 4a are included. The states are opposite to each other. Therefore, the portion “B” cannot be restored because the color difference modulation information is disturbed when white light and excitation light are simultaneously irradiated.

  As described above, in the forgery / alteration preventing medium 1c, the face image 4a is printed on the face image 2, and the sub information 4b of the face image 4a and the sub information 2b of the face image 2 are set as the same information. For this reason, some of the images printed so as not to be disturbed based on an image captured when the forgery / alteration prevention medium 1b is irradiated with white light (illumination light in the visible light band) and the excitation light 104 simultaneously. By performing the authenticity determination based on whether or not the sub information 2b and 4b are obtained, the anti-counterfeit resistance can be improved.

  Note that the program D1 executed by the inspection apparatus 103 of the present embodiment is provided by being incorporated in advance in a ROM or the like. The program D1 executed by the inspection apparatus 103 of the present embodiment is a file in an installable or executable format, such as a CD-ROM, a flexible disk (FD), a CD-R, a DVD (Digital Versatile Disk), or the like. The information may be provided by being recorded on a recording medium that can be read by the user.

  Furthermore, the program D1 executed by the inspection apparatus 103 of the present embodiment may be stored on a computer connected to a network such as the Internet and provided by being downloaded via the network. Further, the program D1 executed by the inspection apparatus 103 of the present embodiment may be provided or distributed via a network such as the Internet.

  The program D1 executed by the inspection apparatus 103 according to the present embodiment has a module configuration including the above-described functional configuration. As actual hardware, a CPU (processor) reads the program D1 from the ROM and executes it. Thus, the functional configuration is loaded on the main storage device and generated on the main storage device.

  Note that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. Moreover, various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, the constituent elements over different embodiments may be appropriately combined.

  DESCRIPTION OF SYMBOLS 1, 1a, 1b, 1c ... Forgery prevention medium 2, 4a ... Face image, 2b, 4b ... Sub information, 2ba, 4ba ... Color difference modulation information, 3 ... Character information, 4 ... Fluorescent material, 5 ... Base material, DESCRIPTION OF SYMBOLS 100 ... Irradiation device, 101 ... LP filter, 102 ... Imaging device, 103 ... Inspection apparatus, 104 ... Excitation light, 105 ... Fluorescence emission, 110 ... CPU, 111 ... ROM, 112 ... RAM, 113 ... Memory | storage part, 114 ... I / O control unit, 115 ... operation device, 116 ... display device, 117 ... bus, 200 ... irradiation device, 204 ... white light, 205 ... reflected light, D1 ... program, D2 ... setting information

Claims (10)

An inspection method of a forgery / alteration medium in an inspection apparatus for inspecting a forgery / alteration medium to be inspected
An irradiation step of irradiating the anti-counterfeit prevention medium with excitation light outside the visible light band for causing the fluorescent material applied to the base material of the anti-counterfeit prevention medium to emit fluorescence.
An imaging step of capturing a first image that is fluorescently emitted by irradiation with the excitation light;
A restoration step of restoring the first sub-information included in the captured first image based on preset key information;
A determination step of determining the authenticity of the forgery / alteration medium based on whether the restored first sub information is predetermined sub information;
Method for inspecting forgery / alteration medium including The imaging step captures a second image on the substrate under visible light,
The restoration step restores the second sub-information included in the captured second image based on preset key information,
The determination step determines whether the forgery / alteration medium is true or false based on whether the restored first sub information and second sub information are predetermined sub information;
The method for inspecting a falsification preventing medium according to claim 1. The restoration step restores the first sub information included in the captured first image based on the restored second sub information,
The determination step determines whether the forgery / alteration medium is true or false based on whether the restored first sub information is predetermined sub information;
The method for inspecting a falsification preventing medium according to claim 2. The restoration step restores the second sub-information included in the captured second image based on the restored first sub-information,
In the determination step, the authenticity of the forgery / alteration medium is determined based on whether or not the restored second sub information is predetermined sub information.
The method for inspecting a falsification preventing medium according to claim 2. A first image that emits fluorescence with excitation light outside the visible light band on the substrate;
The first image includes first sub information restored based on preset key information.
Anti-counterfeit medium. A second image readable under visible light is provided on the substrate,
The second image includes second sub-information restored based on preset key information.
The forgery / alteration preventing medium according to claim 5. The second sub information is key information used when restoring the first sub information.
The forgery / alteration preventing medium according to claim 6. The first sub information is key information used to restore the second sub information.
The forgery / alteration preventing medium according to claim 6. The first image and the second image are overlapped on the substrate,
The first sub information and the second sub information are the same information.
The forgery / alteration preventing medium according to claim 6. The first image and the second image are overlapped on the substrate,
When the excitation light and the visible light are irradiated simultaneously, the first sub information is formed so as to inhibit the restoration of at least a part of the second sub information.
The forgery / alteration preventing medium according to claim 6.

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