WO2011099140A1 - Dispositif de détermination de l'authenticité d'un support et procédé de détermination de l'authenticité d'un support - Google Patents

Dispositif de détermination de l'authenticité d'un support et procédé de détermination de l'authenticité d'un support Download PDF

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Publication number
WO2011099140A1
WO2011099140A1 PCT/JP2010/052038 JP2010052038W WO2011099140A1 WO 2011099140 A1 WO2011099140 A1 WO 2011099140A1 JP 2010052038 W JP2010052038 W JP 2010052038W WO 2011099140 A1 WO2011099140 A1 WO 2011099140A1
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WIPO (PCT)
Prior art keywords
medium
light
value
evaluation value
optically variable
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PCT/JP2010/052038
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English (en)
Japanese (ja)
Inventor
良 池本
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グローリー株式会社
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Priority to PCT/JP2010/052038 priority Critical patent/WO2011099140A1/fr
Publication of WO2011099140A1 publication Critical patent/WO2011099140A1/fr

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    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
    • G07D7/00—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency
    • G07D7/06—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency using wave or particle radiation
    • G07D7/12—Visible light, infrared or ultraviolet radiation
    • G07D7/121—Apparatus characterised by sensor details
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/20—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof characterised by a particular use or purpose
    • B42D25/29—Securities; Bank notes
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
    • G07D7/00—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency
    • G07D7/20—Testing patterns thereon
    • G07D7/202—Testing patterns thereon using pattern matching
    • G07D7/205—Matching spectral properties
    • B42D2033/20—
    • B42D2035/24—

Definitions

  • authenticity determination refers to determining whether or not the banknote is forged.
  • a bill that is not forged is described as a genuine note, and a bill that is forged is described as a forged bill.
  • Such an optically variable ink has the property that the color changes depending on the viewing angle, and exhibits an excellent effect for preventing counterfeiting, but is very expensive and therefore used for a very small part of the printed surface of banknotes. There are many cases.
  • Patent Document 1 discloses a technique for performing true / false determination by performing color imaging each time a banknote as a determination target is sequentially irradiated by light sources arranged at a plurality of positions and analyzing the captured image. ing.
  • Patent Document 2 discloses a technique for performing authenticity determination by imaging a banknote as a determination target with a plurality of cameras having a mechanism with a movable tilt angle and analyzing the captured image. It is disclosed.
  • JP 2008-84179 A US Patent Application Publication No. 2005 / 0169511A1
  • Patent Document 1 when the technique of Patent Document 1 described above is used, it is necessary to arrange a plurality of light sources in the apparatus, and the camera is also limited to those capable of color imaging, so that the apparatus cost increases. there were.
  • the ink can be used on the printing surface without grasping the characteristics of the optically variable ink that changes color depending on the viewing angle. The accuracy of authenticity of the banknotes that had been lost was reduced.
  • the present invention has been made to solve the above-described problems caused by the prior art. Even when optically variable ink is used on the printing surface of a medium, the present invention is low-cost and highly accurate. It is an object of the present invention to provide a medium authenticity determination device and a medium authenticity determination method capable of performing false determination.
  • the present invention provides a medium authenticity determination device for determining the authenticity of a medium including an optically variable portion whose color changes depending on a viewing angle.
  • a light emitting means for emitting visible light of a predetermined color so as to be incident at a predetermined incident angle; and a light receiving means for receiving reflected light reflected by the medium at a reflection angle different from the incident angle;
  • a true / false determining means for determining the authenticity of the medium by comparing the amount of the reflected light in the optically variable portion with a predetermined threshold value;
  • the present invention is characterized in that, in the above invention, the light receiving means is arranged in a direction orthogonal to the light receiving surface of the medium.
  • the present invention is the above invention, wherein the light emitting means is configured to change the color of the reflected light received by the light receiving means to the predetermined color when white light is incident on the medium at the incident angle. It is characterized by.
  • the sum of pixel values for each block including image data acquisition means for acquiring image data of the medium based on the reflected light and a predetermined number of pixels included in the image data.
  • the present invention is also a medium authenticity determination method for determining the authenticity of a medium including an optically variable portion whose color changes depending on a viewing angle, wherein the predetermined color is incident on the medium at a predetermined incident angle.
  • a light emitting step for emitting visible light a light receiving step for receiving reflected light reflected by the medium at a reflection angle different from the incident angle, and a light amount of the reflected light in the optically variable portion.
  • visible light of a predetermined color is emitted so as to enter the medium at a predetermined incident angle, and the reflected light reflected by the medium is received at a reflection angle different from the incident angle. Since the authenticity of the medium is determined by comparing the amount of reflected light in the optically variable portion with a predetermined threshold, even if the optically variable ink is used on the printing surface of the medium Thus, it is possible to perform true / false discrimination with high accuracy at low cost.
  • the color of the reflected light received by the light receiving element is set to the predetermined color. It is possible to increase the reflectance of the reflected light in the portion where the variable ink is used, and it is possible to perform true / false discrimination with high accuracy.
  • the optically variable portion included in the image data since the difference between the block value of the optically variable portion included in the image data and the reference block value of the optically variable portion included in the template is used as the evaluation value, the optically variable There is an effect that it is possible to perform true / false discrimination with high accuracy according to the position of the portion and the block value.
  • the minimum value and / or quasi-minimum value of the block value of the optically variable portion included in the image data, and the minimum value and / or quasi-value of the reference block value of the optically variable portion included in the template Since the evaluation value is calculated by comparing with the minimum value, there is an effect that it is possible to perform the true / false discrimination with high accuracy according to the position and brightness of the optically variable portion.
  • the medium includes a card-like medium in which banknotes, securities, and valuable values are associated
  • optically variable ink is used on a printing surface of banknotes, gift certificates, credit cards, and the like. Even if it is, it is effective in being able to respond
  • FIG. 1 is a diagram showing an outline of a medium authenticity determination method according to the present invention.
  • FIG. 2 is a diagram for explaining the reception of diffusely reflected light.
  • FIG. 3 is a schematic diagram of a line sensor provided in the bill authenticity determination device according to the present embodiment.
  • FIG. 4 is a block diagram illustrating a configuration of the bill authenticity determination device according to the present embodiment.
  • FIG. 5 is a diagram illustrating an example of the emission color information.
  • FIG. 6 is a diagram illustrating an example of an OVI template.
  • FIG. 7 is a diagram for explaining an evaluation value calculation process performed by the evaluation value calculation unit.
  • FIG. 8 is a diagram illustrating an example of the discrimination reference threshold.
  • FIG. 1 is a diagram showing an outline of a medium authenticity determination method according to the present invention.
  • FIG. 2 is a diagram for explaining the reception of diffusely reflected light.
  • FIG. 3 is a schematic diagram of a line sensor provided in the bill authenticity determination device according to the present embodiment.
  • FIG. 1 is a diagram showing an outline of a medium authenticity determination method according to the present invention.
  • the medium authenticity determination method according to the present invention is such that visible light is incident on a medium at a predetermined incident angle, and reflected light having a reflection angle different from the incident angle is received. Has the main characteristics. Another feature is that the reflectance of the reflected light in the OVI portion is increased by making the color of the incident visible light the same color as the reflected light received by the light receiving unit.
  • the light emitting element e1 makes visible light having the same color as the OVI portion A incident on the banknote 1 at a predetermined incident angle (see (1) in the figure).
  • (1) of the same figure shows the example seen from the thickness direction of the banknote 1.
  • the similar color refers to the color of reflected light received in a direction orthogonal to the OVI portion A when white light is incident on the banknote 1 at a predetermined incident angle, that is, the OVI portion A is viewed from directly above.
  • the color when And the reflectance of OVI part A can be raised by injecting the light of this same color with respect to the banknote 1.
  • the definition information of the similar color obtained by previously injecting white light into the banknote 1 is provided for each denomination of the banknote 1, for example. To do. Details of this point will be described later with reference to FIG.
  • the light receiving element e2 receives the reflected light from the OVI portion A of the banknote 1 as shown in FIG. At this time, the light receiving element e2 is oriented perpendicular to the banknote 1 so as to receive not the regular reflected light Sr having a reflection angle equal to the incident angle but the diffuse reflected light Dr having a reflection angle different from the incident angle (hereinafter referred to as “directly above”). (Refer to (2) in the figure).
  • FIG. 2 is a diagram for explaining the reception of the diffuse reflection light Dr.
  • A in the figure shows the case where the banknote 1 ′ is a fake note
  • B shows the case where the banknote 1 is a genuine note
  • C shows the OVI portion. The difference in reflectance between A ′ and A is shown respectively.
  • the OVI portion A ′ of the banknote 1 ′ is the same as the printing surface that does not use normal OVI. . Therefore, the light incident on the OVI portion A 'is reflected only on the surface of the banknote 1' as in the normal printing surface.
  • the light receiving element e2 disposed immediately above the banknote 1 receives the diffuse reflection light Dr at the reflection point P1 of the regular reflection light Sr with respect to the OVI portion A ′ (see (A) in the figure). .
  • the genuine OVI portion A (that is, OVI) is composed of a plurality of layers having different refractive indexes.
  • the figure shows an example of an OVI portion A composed of two layers, a light transmissive dielectric layer and a light reflecting regular reflector layer.
  • the light-transmitting dielectric layer is a translucent medium that transmits light
  • the light-reflecting regular reflector layer is a regular-reflecting medium such as a mirror surface.
  • the refractive index n 1 in the air is assumed to have a relationship of “n 1 ⁇ n 2 , n 2 > n 3 ”.
  • the regular reflection light Sr shown in FIG. 5B is light that is regularly reflected at the reflection point P 1 on the surface of the banknote 1.
  • part of the incident light is refracted at the boundary between the air and the light-transmitting dielectric layer, and travels through the OVI portion A. Then, the light is regularly reflected at a reflection point P2 that is a boundary point between the light-transmitting dielectric layer and the light-reflecting regular reflector layer, and then is emitted into the air as refracted reflected light Re (see (B) in the figure). ).
  • the light receiving element e2 receives different light in the case of a counterfeit note (see (A) in the figure) and in the case of a genuine note (see (B) in the figure). .
  • the authenticity determination of the banknote 1 including the OVI portion A is performed based on the difference in reflectance of the diffuse reflected light Dr. Further, by making visible light of the same color as that of the OVI portion A (see (1) in FIG. 1), the reflectance of the OVI portion A is increased, and the difference in diff shown in (C) of FIG. was made to appear prominently.
  • the light receiving element e2 receives the diffuse reflected light Dr (see (2) in the figure)
  • the input image data 1D is generated based on the received light data.
  • the evaluation value of the OVI portion A is calculated from the generated input image data 1D (see (3) in the figure).
  • the input image data 1D shown in (3) of the figure has 32 values from 0 to 31 in the column direction (see the “m-axis” in the figure) and the row direction (see the “n-axis” in the figure). , And a total of 512 blocks of 16 from 0 to 15. Here, each block is assumed to be composed of the same number of pixels.
  • blocks in which “m” included in the OVI part A is “22” and “n” is “12” are “5”, “4”, “7”, “
  • the authenticity of the banknote 1 is determined by comparing the calculated evaluation value with a predetermined threshold value (see (4) in the figure). Details of this point will be described later with reference to FIG.
  • the evaluation value is calculated for each block constituting the OVI portion A (see (3) in the figure). However, the evaluation value is calculated for each pixel constituting the block. Thus, more accurate authenticity determination may be performed.
  • the line sensor is a mechanism that captures an image of the banknote 300, and a large number of detectors are arranged in parallel in a direction orthogonal to the conveyance direction of the banknote 300 that is the imaging target.
  • the detector includes an LED (Light Emitting Diode) array that is a light emitting element, a photodiode array that is a light receiving element, and the like.
  • the line sensor images the banknote 300 by detecting the distribution of physical quantities such as reflected light and transmitted light at a predetermined position on the banknote 300 to be imaged.
  • the line sensor 200 includes a first line sensor 210 that scans one surface of a bill 300 that is an imaging target, and a second line sensor 220 that scans the other surface. Note that the banknote 300 to be imaged is conveyed in the conveyance direction 600 through the gap between the first line sensor 210 and the second line sensor 220.
  • the first line sensor 210 includes a reflection light source 211 that irradiates one surface of the bill 300 with light of a predetermined wavelength (for example, invisible light such as infrared light or visible light such as green light), and reflection.
  • a lens 212 that collects light emitted from the light source 211 and reflected by the bill 300, a light receiving unit 213 that converts the light collected by the lens 212 into an electrical signal, and an electrical signal converted by the light receiving unit 213.
  • An A / D conversion unit 214 that converts the signal into a signal and a shielding unit 215 that blocks light from the reflection light source 222 of the second line sensor 220 described later are provided.
  • the second line sensor 220 is irradiated from the transmission light source 221 and the reflection light source 222 that irradiates the other surface of the bill 300 with light of a predetermined wavelength, and reflected by the bill 300.
  • a lens 223 that collects the collected light
  • a light receiving unit 224 that converts the light collected by the lens 223 into an electrical signal
  • an A / D conversion unit 225 that converts the electrical signal converted by the light receiving unit 224 into a digital signal.
  • a shielding unit 226 that blocks light from the reflection light source 211 of the first line sensor 210.
  • the light receiving unit 213 of the first line sensor 210 detects part of the light emitted from the transmission light source 221 of the second line sensor 220 via the lens 212. Therefore, the transmission light source 221 is disposed on the optical axis of the lens 212 of the first line sensor 210.
  • LED about the light source 221 / reflective light source 211 and 222 for reflection, it is good also as using light emitting elements other than LED.
  • a double-sided reflection / double-sided transmission type line sensor other than the above-described line sensor may be applied, or a sensor having a simple structure other than the line sensor may be applied.
  • the first line sensor 210 shown in the figure is mainly used, and the reflection light source 211 is assumed to be an RGB light source. Therefore, in the present embodiment, the reflection light source 211 outputs visible light.
  • FIG. 4 is a block diagram illustrating a configuration of the bill authenticity determination device 10 according to the present embodiment.
  • FIG. 4 is a block diagram illustrating a configuration of the bill authenticity determination device 10 according to the present embodiment.
  • only components necessary for explaining the features of the bill authenticity discriminating apparatus 10 are shown, and descriptions of general components are omitted.
  • the denomination information includes a banknote issuing country, a denomination, a scanning direction, and the like. Shall be included.
  • a modification in which the denomination information is recognized by the bill authenticity discriminating device itself will be described later with reference to FIG.
  • the line sensor unit 11 is a device corresponding to the line sensor 200 shown in FIG. 3, and emits light of a predetermined color with respect to a banknote conveyed by a conveyance mechanism (not shown) based on an instruction from the denomination information receiving unit 12 a. Output.
  • the denomination information receiving unit 12a is a processing unit that performs a process of receiving denomination information from the receiving apparatus 100. Further, the denomination information receiving unit 12a determines the emission color for the banknote based on the received denomination information, and also performs a process of instructing the determined emission color to the line sensor unit 11. When determining the emission color, the denomination information receiving unit 12a refers to the emission color information 13a.
  • FIG. 5 is a diagram illustrating an example of the emission color information 13a.
  • the light emission color information 13a is information including a “country name” item, a “denomination” item, a “scanning direction” item, and a “light emission color” item.
  • the light emission color information 13a is static information defined in advance through a verification test of the bill authenticity determination device 10 or the like.
  • the “country name” item is an item in which the issuing country of the banknote that is the object of authenticity determination is stored.
  • the “denomination” item is an item in which the denomination of the banknote issued in each issuing country is stored. For example, in the case shown in the figure, it indicates that the banknotes issued in the ⁇ country are of two types, A denomination and B denomination.
  • the “scanning direction” item is an item in which the scanning direction when a bill that is the target of authenticity determination is scanned by the line sensor is stored.
  • the scanning direction when a bill that is the target of authenticity determination is scanned by the line sensor is stored.
  • the color of the light stored in the “emission color” item is a color that looks down on the OVI portion from directly above when white light is incident on the banknote.
  • the reflectance of the diffuse reflected light in an OVI part can be raised by injecting the light of this color with respect to a banknote.
  • the color of light incident on the front right and left banknotes of country A denomination is green. Therefore, it can be seen that when white light is incident on the front side of the same denomination, the color of the OVI portion viewed from directly above is green.
  • the figure shows the case where the color of light incident on the back side of the denomination B of country ⁇ is not stored, but this indicates that there is no OVI part on the back side of the denomination. Yes.
  • the denomination information receiving unit 12a shown in FIG. 4 refers to the emission color information 13a and determines the color stored in the “emission color” item of the record that matches the denomination information received from the receiving apparatus 100. An instruction is given to the line sensor unit 11.
  • the image data acquisition unit 12b is a processing unit that performs processing for synthesizing the output from the line sensor unit 11 for one banknote and generating image data for the entire banknote. Further, the image data acquisition unit 12b performs a process of dividing the generated image data into predetermined blocks to obtain input image data 1D (see FIG. 1) and outputting the input image data to the OVI part specifying unit 12c.
  • the OVI part specifying unit 12c is a processing unit that performs a process of extracting an OVI template that matches the denomination and scanning direction of the input image data 1D from the OVI template group 13b. Further, the OVI part specifying unit 12c specifies the OVI part on the input image data 1D in block units in light of the extracted OVI template, and also performs a process of outputting the block position to the evaluation value calculating unit 12d. .
  • FIG. 6 is a diagram illustrating an example of the OVI template.
  • (A) in the figure shows an OVI template 1T having one OVI part A
  • (B) in the figure shows an OVI template 2T having a plurality of OVI parts A1 to A3. .
  • the OVI template 1T is registered in advance in the OVI template group 13b as the template information of the banknote (see (A) in the figure).
  • the position of the block constituting the OVI portion A and the reference block value are defined in units of blocks. Therefore, in the case shown in the figure, the 15 block positions and the reference block values constituting the OVI portion A are defined in units of blocks.
  • the block shown in (A) of FIG. 5 where “m” is [22] and “n” is “12” (see FIG. 1 for m and n) is the reference of each pixel constituting the block.
  • This is a block having pixel values “3”, “4”, “6”, and “2”.
  • each OVI template is registered for each banknote denomination and scanning direction. Therefore, when the bill authenticity discriminating apparatus 10 can perform scanning in four directions for each denomination of banknotes, four OVI templates are registered for each denomination.
  • the evaluation value calculation unit 12d calculates the evaluation value based on the block value and the reference block value of each block of the OVI part specified by the processing unit 12c in light of the OVI template extracted by the OVI part specification unit 12c. Is a processing unit.
  • the evaluation value calculation unit 12d also performs a process of outputting the calculated evaluation value of each block to the determination unit 12e.
  • FIG. 7 is a diagram for explaining an evaluation value calculation process performed by the evaluation value calculation unit 12d.
  • (A) of the same figure shows the case where a block value is collated
  • (B) of the same figure shows the case where the pixel value of each pixel which comprises a block is collated, respectively.
  • the evaluation value calculation unit 12d calculates the evaluation value of the input block by collating the block value. Specifically, the sum of the pixel values constituting the input block is calculated as a block value (see (A-1) in the figure), and the difference between the block value of the input block and the reference block value of the template block is calculated. Assume an evaluation value (see (A-2) in the figure).
  • the pixel values of the input block are “5”, “4”, “7”, and “4”, and the reference block values of the template blocks corresponding thereto are It is assumed that it is “15”.
  • the evaluation value of the input block may be calculated by collating the pixel value of each pixel constituting the block instead of the block value. Specifically, the difference between corresponding pixels in the input block and the template block is taken (see (B-1) in the figure), and the sum of the differences may be used as the evaluation value (see the figure). (See (B-2)).
  • each pixel value of the input block is “5”, “4”, “7”, “4”, and each reference pixel value of the template block corresponding thereto. Are “3”, “4”, “6”, and “2” in this order.
  • the sum of the block values of all the blocks included in the OVI portion A of the input image data 1D shown in FIG. 7, and the sum of the block values of all the blocks included in the OVI portion A of the OVI template 1T And the evaluation value of the OVI portion A may be calculated.
  • the image data may be normalized by the average value of the block values included in the OVI portion A.
  • FIG. 11 is a diagram for explaining another method related to calculation of an evaluation value.
  • (A) in the figure shows the case based on the ratio of the OVI part A and the non-OVI part B
  • (B) in the figure shows the minimum or quasi-minimum block value of the OVI part A. Each case is shown.
  • the evaluation value can be calculated based on the ratio of the OVI part A and the non-OVI part B. For example, the ratio of the sum of the block values of the OVI portion A of the input image data 1D to the sum of the block values of the non-OVI portion B is calculated (see (A-1) in the figure).
  • the same calculation is performed for the same area on the template, and the evaluation value can be calculated by comparing the calculation ratio of the input image data 1D with the calculation ratio on the template ((A in FIG. -2)).
  • the evaluation value can be calculated based on the minimum value or the quasi-minimum value of the block value of the OVI portion A.
  • the minimum value or quasi-minimum value of the block value of the OVI portion A of the input image data 1D is extracted (see (B-1) in the figure), and the minimum value or quasi-minimum value of the same area on the template
  • the evaluation value may be calculated by comparison (see (B-2) in the figure).
  • (B) of the figure shows the case where the minimum value or the quasi-minimum value is used
  • the minimum value when used, the OVI portion and the contaminated portion may not be distinguished. Therefore, in such a case, it is preferable to use a quasi-minimum value.
  • not only one of the minimum value and the quasi-minimum value but both may be used together, and can be changed as appropriate according to the accuracy of true / false determination.
  • (B) in the figure shows the case where the minimum value or the quasi-minimum value of the block value is used, but the pixel values constituting the block may be used.
  • the determination unit 12e is a processing unit that performs a final authenticity determination process by comparing the evaluation value of each block received from the evaluation value calculation unit 12d with the determination reference threshold 13c of the storage unit 13.
  • the discrimination criterion threshold 13c is, for example, a threshold that indicates the upper limit value of the evaluation value for each block included in the OVI portion, and the discrimination unit 12e has even one block whose evaluation value exceeds the discrimination criterion threshold 13c. When there is, it discriminate
  • FIG. 8 is a diagram illustrating an example of the discrimination reference threshold 13c.
  • the discrimination reference threshold 13 c includes the “country name” item, the “denomination” item, the “scan direction” item, the X “evaluation position” items, and the X “threshold values”. Information including items. Note that the value X is equivalent to m ⁇ n (see FIG. 1 for m and n), and is equal to the total number of blocks of the input image data 1D.
  • the “country name” item, the “denomination” item, and the “scan direction” item are the same as those in the above-described emission color information 13a (see FIG. 5), and thus description thereof is omitted here.
  • the “evaluation position” item is an item in which the position of the block included in the OVI portion is stored, and the threshold value of the evaluation value allowed in the block at the position is stored in the “threshold value” item.
  • the block where “m” is “9” and “n” is “12” is 1 as the evaluation position. This indicates that the threshold value of the evaluation value allowed for such a block is “5”.
  • threshold value that is an upper limit value and a threshold value that is a lower limit value are stored and allowed for each block. It is good also as defining the tolerance
  • the storage unit 13 is a storage unit configured by a storage device such as a hard disk drive or a nonvolatile memory, and stores the emission color information 13a, the OVI template group 13b, and the discrimination reference threshold 13c.
  • storage part 13 is defined as static definition information beforehand through the verification test at the time of development of the banknote authenticity discrimination device 10, etc.
  • the light emission color information 13a is information on the light emission color that is referred to when the denomination information receiving unit 12a performs the light emission color determination process. Since the details of the emission color information 13a have been described above (see FIG. 5), description thereof is omitted here.
  • the OVI template group 13b is a template group in which a predetermined position and a predetermined reference block value of each block included in the OVI part are defined in advance for each denomination and scanning direction of the banknote.
  • the OVI part specifying unit 12c and the evaluation Referenced by the value calculator 12d Since the details of the OVI template group 13b have also been described above (see FIG. 6), description thereof is omitted here.
  • the discrimination reference threshold 13c is information relating to a predetermined threshold that is referred to when the discrimination unit 12e performs authenticity discrimination processing. Since the details of the discrimination reference threshold 13c have also been described above (see FIG. 8), description thereof is omitted here.
  • FIG. 9 is a flowchart illustrating a processing procedure executed by the bill authenticity determination device 10 according to the present embodiment.
  • the denomination information receiving unit 12a determines the emission color based on the received denomination information (step S101). And the line sensor part 11 injects light into the banknote which is a discrimination
  • the OVI part specifying unit 12c extracts the corresponding OVI template from the OVI template group 13b according to the denomination information (step S103).
  • the OVI part specifying unit 12c matches the input image data 1D with the extracted OVI template, and specifies the position of each block included in the OVI part as the evaluation position (step S104). Then, the evaluation value calculation unit 12d calculates the evaluation value while collating the value regarding the pixel at the evaluation position with the value regarding the pixel at the same position in the OVI template (step S105).
  • determination part 12e compares an evaluation value with a predetermined threshold value about all the evaluation positions (step S106).
  • the discrimination reference threshold 13c is referred to.
  • determination part 12e judges whether the evaluation value has exceeded the predetermined threshold value about all the evaluation positions (step S107).
  • step S107 If the evaluation values for all the evaluation positions do not exceed the predetermined threshold (step S107, Yes), the determination unit 12e determines that the banknote to be determined is a genuine note (step S108), and ends the process. .
  • step S107 determines that the banknote to be determined is a fake note (step S109), and ends the process.
  • the denomination information receiving unit determines the color of light incident on the banknote based on the received denomination information
  • the line sensor unit determines the light of the determined color. Is emitted so as to be incident at a predetermined incident angle, and reflected light having a reflection angle different from the incident angle is received, and the image data acquisition unit generates input image data based on the reflected light, and generates an OVI portion.
  • the specifying unit specifies the OVI portion of the generated input image data by collating with a pre-defined OVI template, and the evaluation value calculating unit determines the evaluation value of the specified OVI portion as a pixel of a pixel constituting the block
  • the bill authenticity discrimination device is configured such that the block is calculated for each block, and the discrimination unit compares the calculated evaluation value with the discrimination reference threshold value to determine the authenticity of the bill. Therefore, even if the optically variable ink is used on the printing surface of the banknote, the authenticity determination can be performed with low cost and high accuracy.
  • the bill authenticity discriminating apparatus identifies the denomination based on the input from the external accepting apparatus.
  • FIG. 10 is a block diagram illustrating a configuration of a bill authenticity determination device 10a according to a modification.
  • FIG. 10 the same components as those in the banknote authenticity determination device 10 according to the embodiment shown in FIG. 4 are denoted by the same reference numerals, and in the following, the same components as those in the above-described embodiment will be described. The description of will be omitted.
  • the bill authenticity determination device 10 a includes a denomination information identification unit 12 f instead of the denomination information reception unit 12 a (see FIG. 4) in the control unit 12. It differs from the banknote authenticity determination apparatus 10 which concerns on the Example mentioned above by the point further provided with the denomination template group 13d in the memory
  • FIG. 10 shows that the bill authenticity determination device 10 a according to the modified example includes a denomination information identification unit 12 f instead of the denomination information reception unit 12 a (see FIG. 4) in the control unit 12. It differs from the banknote authenticity determination apparatus 10 which concerns on the Example mentioned above by the point further provided with the denomination template group 13d in the memory
  • the image data acquisition unit 12b outputs to the denomination information identification unit 12f, and the denomination information identification unit 12f outputs to the OVI part identification unit 12c. This is different from the bill authenticity discrimination device 10 according to the above-described embodiment.
  • the denomination template group 13d is a banknote image data group for each denomination and scanning direction, and is static definition information registered in advance for denomination identification.
  • the line sensor unit 11 is incident while switching a plurality of types of light instantaneously (in a so-called time slice method).
  • the breakdown of the plurality of types of light includes light for acquiring input image data for denomination identification (for example, white light) and light for acquiring an input image data group for authenticity determination. is there. Further, for the light for acquiring the input image data group for authenticity determination, all types of light assumed as the predetermined color of the OVI portion (that is, all types of the emission color information 13a) are sequentially incident.
  • the image data acquisition unit 12b acquires the input image data for denomination identification and the input image data group for authenticity determination based on the reflected light of each of the plurality of types of light, and the denomination information identification unit Processing to output to 12f is performed.
  • the denomination information identifying unit 12f performs a process of collating the denomination input image data with each denomination template of the denomination template group 13d to identify the denomination and the scanning direction of the banknote.
  • the denomination information identification unit 12f refers to the emission color information 13a, determines the emission type corresponding to the identified denomination and scanning direction, and has already acquired the input image data by the reflected light of the emission color. A process of specifying from the input image data group for true / false discrimination is performed.
  • the denomination information identifying unit 12f outputs the identified input image data as input image data 1D (see FIG. 1) to the OVI part identifying unit 12c. Thereafter, the bill authenticity determination device 10a according to the modification performs the same authenticity determination as the bill authenticity determination device 10 according to the above-described embodiment.
  • the line sensor part 11 showed the example which injects, switching several types of light instantly,
  • a banknote is conveyed twice.
  • the light source and the light receiver may be provided in two stages.
  • the input image data for denomination identification may be acquired at the time of the first conveyance or by the first-stage sensor unit. Then, it is assumed that the input image data 1D for authenticity determination is acquired with the emission type corresponding to the denomination of the input image data and the scanning direction at the second transport time or with the second stage sensor unit. Good.
  • the medium that is the target of the authenticity determination is not particularly limited.
  • a gift certificate or a credit card associated with a valuable value may be used.
  • the medium authenticity determination apparatus and the medium authenticity determination method according to the present invention are low-cost and highly accurate authenticity even when optically variable ink is used on the printing surface of the medium. This is useful when it is desired to make a determination, and is particularly suitable for application to a device that determines the authenticity of a valuable medium such as banknotes that is highly circulated.

Abstract

L'invention concerne un dispositif de détermination de l'authenticité d'un support configuré de telle sorte qu'une lumière visible ayant une couleur prédéterminée est irradiée, à un angle d'incidence prédéterminé, sur un support comprenant une portion optiquement variable dans laquelle la couleur change en fonction d'un angle d'observation. Selon l'invention, une lumière réfléchie ayant un angle de réflexion différent de l'angle d'incidence est reçue, une valeur d'évaluation en rapport avec la portion optiquement variable est calculée en se basant sur la quantité de lumière réfléchie au niveau de la portion optiquement variable et la valeur d'évaluation est comparée avec une valeur de seuil prédéterminée pour déterminer l'authenticité du support.
PCT/JP2010/052038 2010-02-12 2010-02-12 Dispositif de détermination de l'authenticité d'un support et procédé de détermination de l'authenticité d'un support WO2011099140A1 (fr)

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PCT/JP2010/052038 WO2011099140A1 (fr) 2010-02-12 2010-02-12 Dispositif de détermination de l'authenticité d'un support et procédé de détermination de l'authenticité d'un support

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PCT/JP2010/052038 WO2011099140A1 (fr) 2010-02-12 2010-02-12 Dispositif de détermination de l'authenticité d'un support et procédé de détermination de l'authenticité d'un support

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015169964A (ja) * 2014-03-04 2015-09-28 株式会社東芝 検査装置

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62242291A (ja) * 1986-04-14 1987-10-22 富士電機株式会社 紙葉類の識別方法
JP2005196627A (ja) * 2004-01-09 2005-07-21 Olympus Corp 偽券検知機能付きカメラ及びカメラを用いた偽券検知方法
JP2006146321A (ja) * 2004-11-16 2006-06-08 Nippon Conlux Co Ltd 紙葉類識別装置および方法
WO2009072211A1 (fr) * 2007-12-07 2009-06-11 Glory Ltd. Dispositif d'identification de billet de banque et procédé d'identification de billet de banque
JP2009230448A (ja) * 2008-03-24 2009-10-08 Hitachi Omron Terminal Solutions Corp 紙葉類識別装置

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62242291A (ja) * 1986-04-14 1987-10-22 富士電機株式会社 紙葉類の識別方法
JP2005196627A (ja) * 2004-01-09 2005-07-21 Olympus Corp 偽券検知機能付きカメラ及びカメラを用いた偽券検知方法
JP2006146321A (ja) * 2004-11-16 2006-06-08 Nippon Conlux Co Ltd 紙葉類識別装置および方法
WO2009072211A1 (fr) * 2007-12-07 2009-06-11 Glory Ltd. Dispositif d'identification de billet de banque et procédé d'identification de billet de banque
JP2009230448A (ja) * 2008-03-24 2009-10-08 Hitachi Omron Terminal Solutions Corp 紙葉類識別装置

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015169964A (ja) * 2014-03-04 2015-09-28 株式会社東芝 検査装置

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