WO2017145779A1 - Appareil d'identification de document de valeur, processeur de document de valeur, unité de capteur d'image et procédé de détection de zone d'élément variable optique - Google Patents

Appareil d'identification de document de valeur, processeur de document de valeur, unité de capteur d'image et procédé de détection de zone d'élément variable optique Download PDF

Info

Publication number
WO2017145779A1
WO2017145779A1 PCT/JP2017/004779 JP2017004779W WO2017145779A1 WO 2017145779 A1 WO2017145779 A1 WO 2017145779A1 JP 2017004779 W JP2017004779 W JP 2017004779W WO 2017145779 A1 WO2017145779 A1 WO 2017145779A1
Authority
WO
WIPO (PCT)
Prior art keywords
valuable document
light
angle
optical variable
variable element
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2017/004779
Other languages
English (en)
Japanese (ja)
Inventor
史哲 嶋岡
孝洋 柳内
晶 坊垣
高明 森本
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Glory Ltd
Original Assignee
Glory Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Glory Ltd filed Critical Glory Ltd
Priority to CN201780008355.7A priority Critical patent/CN108496207B/zh
Publication of WO2017145779A1 publication Critical patent/WO2017145779A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Images

Classifications

    • 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
    • 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

Definitions

  • the present invention relates to a valuable document identification device, a valuable document processor, an image sensor unit, and a method for detecting an optical variable element region. More specifically, a valuable document identification device and a valuable document processing machine equipped with an optical variable element region suitable for authenticity evaluation of valuable documents such as banknotes, gift certificates, checks, and card-like media.
  • the present invention relates to an image sensor unit and a method for detecting an optical variable element region.
  • banknotes Various security features are imparted to valuable documents such as banknotes, gift certificates, and checks to prevent counterfeiting.
  • paper used for banknotes is mainly made of vegetable fiber, but for the purpose of improving durability, water resistance, security, etc., paper made of synthetic fiber or synthetic resin sheet is used.
  • a polymer sheet may be used.
  • a banknote made from a polymer sheet is called a polymer banknote, and a polymer banknote provided with a transparent window is difficult to counterfeit.
  • an optical variable element (Optical Variable Device: OVD) is used in many countries.
  • the optical variable element uses an optical element such as a diffraction grating, a thin film, or a microlens to cause an optical effect such as a change in color or pattern.
  • the appearance of the optical variable element such as a color or a pattern is changed by changing the angle of light illuminating the optical variable element and / or the angle at which the optical variable element is seen.
  • Holograms, optically variable ink (Optical ari Variable Ink: ⁇ OVI), motion threads, and the like are types of optically variable elements.
  • a motion thread is formed by arranging microlenses on a plurality of minute images called icons via optical spacers (see, for example, Patent Document 1).
  • the optical variable element is useful not only for the naked eye but also for authenticity determination of valuable documents using the apparatus. Specifically, it is determined whether or not there is an optical variable element at a position corresponding to the type of the valuable document.
  • Other technologies that use optical variable elements for authenticity determination of valuable documents are disclosed below.
  • Patent Document 2 light sources having different emission angles are arranged on both sides of a lens combined with a photoelectric conversion element in order to detect color-shifting inks having different colors when viewed from different angles.
  • a contact image sensor having a non-reflective film attached to the inner surface of the plate is disclosed.
  • Patent Document 3 discloses a step of taking a first image of at least a part of a document while at least a part of the document is exposed to a first electromagnetic radiation from a first incident angle; Capturing a second image of at least a portion of a document while at least a portion is exposed to a second electromagnetic radiation from a second angle of incidence. Is disclosed.
  • Patent Document 4 discloses a verification device that identifies optically variable ink and verifies the authenticity of a valuable ticket.
  • the verification device includes a first light source light emitting unit, a second light source light emitting unit, a light receiving element, Are disposed on both sides of the normal line of the valuable ticket, and the angle formed by the optical axis of the second light source light emitting unit and the normal line is greater than the angle formed by the optical axis of the first light source light emitting unit and the normal line. large.
  • Patent Document 5 a first image captured by a first light source that irradiates light from a first direction toward a paper sheet, and a second light source that irradiates light from a second direction toward the paper sheet.
  • a paper sheet identification device that generates a captured second image and determines that the paper sheet has a motion thread when the thread image included in the first image is different from the thread image included in the second image. It is disclosed.
  • optical variable elements such as optical variable ink and color shift ink that change color according to the angle viewed by the observer and the incident angle of irradiation light, and optical variable elements whose pattern changes with color, such as rainbow holograms Detecting the presence or absence of an optical variable element that changes is useful for accurate authenticity determination of valuable documents such as banknotes.
  • the optical variable element is to be observed from different angles as in the case of observation with the naked eye, it is necessary to provide a plurality of optical sensors having different light receiving angles, which increases the cost of the apparatus. For this reason, it is preferable to provide a plurality of light sources having different irradiation angles and one photosensor. At this time, since the detection capability of the optical variable element varies depending on the angle of the light source and the angle of the optical sensor, each angle must be set to an appropriate angle.
  • Patent Documents 2 to 5 described above disclose apparatuses that use a plurality of light sources and one optical sensor to detect an optical variable element.
  • Patent document 2 is disclosing the sensor unit which has arrange
  • the banknote identification surface discoloration ink on the conveyed sheet is photographed from the vertical direction.
  • the color change of the optically variable ink viewed from the vertical direction is less than that observed from the oblique direction. Therefore, it is not suitable for detection of optically variable ink whose color changes according to the viewing angle.
  • Patent Document 3 discloses an example in which the incident angle of the electromagnetic radiation source is ⁇ 90 to 90 ° and the incident angle of the imaging device is ⁇ 90 to 90 °.
  • the optically variable material is directly irradiated with an electromagnetic irradiation beam and photographed.
  • a light source, a light receiving unit, an optical variable element, In general, a transparent window portion made of glass or the like is provided. When transparent glass is disposed, if the imaging device is disposed near ⁇ 90 °, illumination and photographing may not be performed satisfactorily due to reflection on the glass surface. Therefore, in Patent Document 3, the angle of the imaging device is not specified.
  • the angle between the optical axis of the first light source light emitting unit and the normal line of the valuable ticket is 0 to 30 °, and the angle between the optical axis of the light receiving element and the normal line is 0 to 20 °. is there.
  • the light receiving element is 0 to 20 °, as described above, it is not suitable for detecting optically variable ink whose color changes according to the viewing angle.
  • the first light source light emitting unit and the light receiving element are arranged at positions almost symmetrical with respect to the normal line of the valuable ticket, if a transparent window portion made of glass is provided, the light reflected on the glass surface May directly illuminate the light receiving sensor, and there is a possibility that the optical variable element cannot be imaged satisfactorily.
  • Patent Document 5 identifies a motion thread as described in Patent Document 1, that is, an optical variable element in which an image (symbol) itself changes according to a viewing angle
  • the identification disclosed in Patent Document 5 is disclosed.
  • the apparatus and the identification method cannot be used as they are for detecting holograms and optically variable ink. This is because, for holograms and optically variable inks that change color and pattern due to optical effects such as diffraction and interference, the motion thread color and pattern change is the color and pattern placed at the position where the microlens forms an image. It depends on. That is, since this is a problem in the design of a motion thread, a technique effective in a specific motion thread is not necessarily effective in other motion threads.
  • the present invention has been made in view of the above-described present situation, improves the determination accuracy of the presence or absence of an optical variable element region on the surface of a valuable document, and provides a valuable document identification device capable of determining the authenticity of a valuable document with high accuracy.
  • An object of the present invention is to provide a document processing machine, an image sensor unit, and an optical variable element region detection method.
  • the present invention relates to a valuable document identification device for identifying the authenticity of a valuable document having an optical variable element region, the first light source for irradiating the optical variable element region from a first direction, and a second direction A second light source for irradiating light to the optical variable element region, a light receiving unit for receiving light reflected from the optical variable element region from a third direction, and information on reflected light of the first light source.
  • a determination unit that determines presence / absence of the optical variable element region based on one reflected light information and second reflected light information that is information of reflected light of the second light source, and includes the optical variable element region A first angle that is an angle between a vertical line of the surface of the valuable document and the first direction; a second angle that is an angle between the vertical line and the second direction; and the vertical line And the third angle which is an angle formed by the third direction is different from each other, Serial third angle is 25 ° or more, and less than 90 °.
  • the optical variable element region includes at least one of an optical interference structure and an optical diffraction structure.
  • the present invention is characterized in that, in the above invention, the determination unit determines the authenticity of the valuable document based on a color difference between the first reflected light information and the second reflected light information.
  • the present invention is the above invention, wherein the valuable document has an optical variable ink region and a hologram region as the optical variable element region, and the determination unit determines a type of the valuable document and determines the type. Identifying the position of the optically variable ink area and the position of the hologram area from information relating to the valuable document of the type determined by the section, wherein the optically variable ink area includes the first reflected light information and the second reflected light information; The authenticity of the valuable document is determined based on the color difference between the first reflected light information and the second reflected light information in the hologram area, and at least one of color, brightness, and shape between the first reflected light information and the second reflected light information is determined. The authenticity of the valuable document is determined based on the difference between the two.
  • the present invention is characterized in that, in the above-mentioned invention, the third angle is 60 ° or less.
  • the third angle is 55 ° or less.
  • the first angle is -10 ° to 20 °
  • the second angle is 40 ° to 70 °.
  • the first angle is ⁇ 5 ° to 15 °
  • the second angle is 45 ° to 65 °.
  • the first light source, the second light source, and the light receiving unit are arranged on the same plane
  • the valuable document identification device includes the first light source and the second light source.
  • a transparent plate disposed between the valuable document and the first light source and the second light source, when the transparent plate is irradiated with light, a region where specularly reflected light is incident on the light receiving unit is provided. It is characterized by being placed between them.
  • the light receiving unit includes a line sensor that images the valuable document in a straight line, and each of the first light source and the second light source includes a linear sensor by the line sensor.
  • the imaging region is irradiated with light.
  • the present invention is the above invention, wherein the light receiving unit receives light emitted from the first light source and the second light source and reflected by the optical variable element region, and the first angle,
  • the second angle and the third angle are angles on a reference plane orthogonal to the linear imaged region, the first angle is smaller than the third angle, and the second angle Is greater than the third angle.
  • the present invention is further characterized by further comprising a transport mechanism for transporting the valuable document.
  • the determination unit may compare the color of the first image based on the first reflected light information with the color of the second image based on the second reflected light information. It is characterized by determining the authenticity of the document.
  • a valuable document processing machine including the valuable document identification device.
  • the present invention also relates to a method for detecting an optical variable element region of a valuable document, wherein the optical variable element region is irradiated with light from a first direction, and the light reflected from the optical variable element region is received.
  • One reading step, a second reading step of irradiating the optical variable element region with light from a second direction and receiving light reflected from the optical variable element region, and a reflected light of the first reading step A determination step of determining presence or absence of the optical variable element region based on first reflected light information that is information and second reflected light information that is information of reflected light in the second reading step, and
  • the first irradiation step and the second irradiation step the light reflected from the optical variable element region is received from a third direction, and the vertical line of the surface of the valuable document including the optical variable element region and the first Angle with the direction of A first angle, a second angle that is an angle between the vertical line and the second direction, and a third angle that is an angle between the vertical line and
  • the present invention also provides an image sensor unit for detecting an optical variable element region of a valuable document, the first light source for irradiating the optical variable element region from a first direction, and the second direction.
  • the valuable document including the optical variable element region, comprising: a second light source that irradiates light to the optical variable element region; and a light receiving unit that receives light reflected from the optical variable element region from a third direction.
  • a first angle that is an angle between the vertical line of the surface and the first direction, a second angle that is an angle between the vertical line and the second direction, the vertical line and the first direction.
  • the third angle which is an angle formed with the three directions, is different from each other, and the third angle is 25 ° or more and less than 90 °.
  • the valuable document identification device the valuable document processor, the image sensor unit, and the optical variable element region detection method of the present invention, it is possible to improve the determination accuracy of the presence or absence of the optical variable element region on the valuable document surface. Therefore, the authenticity of the valuable document can be determined with high accuracy.
  • FIG. 1 is a schematic plan view of an image acquisition device according to Embodiment 1.
  • FIG. 3 is a schematic perspective view for explaining an imaging method in the image acquisition apparatus according to Embodiment 1.
  • FIG. It is a graph which shows the incident angle dependence of the reflectance on the surface of a transparent plate, The refractive index of a transparent plate is 1.5, and is derived from Fresnel's formula.
  • 6 is another schematic cross-sectional view of the image acquisition device according to Embodiment 1.
  • FIG. 1 is a schematic plan view of an image acquisition device according to Embodiment 1.
  • FIG. 3 is a schematic perspective view for explaining an imaging method in the image acquisition apparatus according to Embodiment 1.
  • FIG. It is a graph which shows the incident angle dependence of the reflectance on the surface of a transparent plate, The refractive index of a transparent plate is 1.5, and is derived from Fresnel's formula.
  • 6 is another schematic cross-sectional view of the image acquisition device according to Embodi
  • (A) is the figure which showed the captured image (irradiation angle 0 degree, light reception angle 45 degrees) which concerns on Embodiment 1
  • (b) is R, G, and B computed from the captured image of (a). It is a histogram which shows intensity distribution.
  • (A) is the figure which showed the captured image (irradiation angle 60 degrees, light reception angle 45 degrees) based on Embodiment 1
  • (b) is R, G, and B computed from the captured image of (a). It is a histogram which shows intensity distribution. In this ticket, it is a graph which shows the result of having normalized the color ratio of blue with the value of 60 degrees of irradiation angles.
  • FIG. 1 is a schematic cross-sectional view of a valuable document identification device according to Embodiment 1.
  • FIG. It is a functional block diagram of the valuable document identification device according to the first embodiment. It is a cross-sectional schematic diagram which shows the layer structure of the optical variable ink area
  • FIG. 1 is a schematic cross-sectional view of a valuable document identification device according to Embodiment 1.
  • FIG. It is a functional block diagram of the valuable document identification device according to the first embodiment. It is a cross-sectional schematic diagram which shows the layer structure of the optical variable ink area
  • FIG. 3 is a schematic cross-sectional view illustrating a layer configuration of an optically variable ink region according to Embodiment 1 and illustrates a case where the optically variable ink includes an optically variable pigment.
  • 6 is a flowchart showing optical variable ink region determination processing performed by the valuable document identification apparatus according to the first embodiment. 6 is a flowchart illustrating a method for determining an optically variable ink area performed by the valuable document identifying apparatus according to the first embodiment. It is a schematic diagram for demonstrating the case where the 100 yuan banknote issued in 2005 is processed with the flow shown in FIG. 6 is a flowchart illustrating a method for calculating an evaluation value of an optically variable ink area, which is performed by the valuable document identifying apparatus according to the first embodiment.
  • FIG. 1 is a perspective schematic diagram which shows the external appearance of the valuable document processing apparatus which concerns on Embodiment 1
  • (b) is a cross-sectional schematic diagram which shows the structure outline
  • FIG. It is a perspective view which shows the external appearance of another valuable document processing apparatus which concerns on Embodiment 1.
  • the image acquisition apparatus has a function of acquiring at least color image information as reflected light information from various valuable documents such as banknotes, checks, gift certificates, securities, and the like in the valuable document identification apparatus according to the present embodiment.
  • the feature is extracted from the acquired image information and used to determine the type of valuable document and the presence or absence of the optical variable element region.
  • the valuable document identification device includes an image acquisition device (image sensor unit) 10 shown in FIG.
  • the image acquisition device 10 acquires a reflected image of the valuable document 100 being conveyed.
  • the conveyance direction of the valuable document 100 is the negative X-axis direction
  • the axis perpendicular to the conveyance surface is the Z-axis
  • the Y-axis is orthogonal to the X-axis and the Z-axis.
  • the valuable document 100 is conveyed substantially parallel to the conveyance surface, and the positive side of the Z axis is referred to as the upper side, and the negative side of the Z axis is referred to as the lower side.
  • the Z-axis positive side surface of the valuable document 100 is referred to as an upper surface
  • the Z-axis negative side surface of the valuable document 100 is referred to as a lower surface.
  • the valuable document 100 is provided with an optical variable element region 101, and symbols and patterns such as numerals are drawn in the optical variable element region 101 by the optical variable element.
  • the optical variable element that can be used in the present embodiment include an optical variable element that changes its color or pattern due to an optical effect such as a hologram and an optical variable ink.
  • an optical variable element that changes color by an optical effect such as an optical variable ink, is preferable.
  • the color change of the optical variable element is caused by interference of reflected light of the light irradiated to the optical variable element due to the effect of a thin film or a diffraction grating.
  • the image acquisition apparatus 10 includes a housing 18, and a transparent plate 19 formed of glass or resin is fitted on one surface of the housing 18 (a surface facing the valuable document 100) to form a transparent window portion. .
  • the image acquisition apparatus 10 includes a first light source 11 and a second light source 12 that irradiate light on the surface of the valuable document 100, and a light receiving unit 13 that receives light reflected on the surface of the valuable document 100. The light emitted from the first light source 11 and the second light source 12 is reflected by the surface of the valuable document 100 and received by the light receiving unit 13.
  • the light receiving unit 13 includes a line sensor 14, and the line sensor 14 includes a plurality of imaging elements 15, a substrate 17, and a plurality of light receiving elements 16 provided on the substrate 17.
  • the plurality of imaging elements 15 are arranged in the Y-axis direction to form an imaging element array
  • the plurality of light-receiving elements 16 are arranged in the Y-axis direction to form a light-receiving element array.
  • the imaging element 15 condenses the reflected light emitted from the first light source 11 and reflected from the surface of the valuable document 100 and the reflected light emitted from the second light source 12 and reflected from the surface of the valuable document 100.
  • the light receiving element 16 is arranged to receive light. As shown in FIG.
  • the line sensor 14 having the light receiving element array and the imaging element array arranged in the Y-axis direction images the linear imaged region 102 of the valuable document 100 all at once over the entire Y-axis direction. . Further, the line sensor 14 captures the entire valuable document 100 by sequentially performing such imaging on the valuable document 100 being conveyed.
  • the imaging element 15 is a transparent cylindrical condensing lens called a rod lens, and condenses the reflected light reflected by the valuable document 100 on the light receiving element 16 and propagates it.
  • the light receiving element 16 is an arrayed light receiving element such as a CCD (Charge-Coupled Device) or CMOS (Complementary Metal Oxide Semiconductor). When the reflected light reflected by the valuable document 100 is received, the light receiving element 16 corresponds to the amount of light received. A signal is output to the substrate 17.
  • Each of the light receiving elements 16 is provided with a color selection filter, specifically, a color filter of red (R), green (G), or blue (B) that is the three primary colors of light. Thereby, each pixel has color information and the output signal is colored.
  • the type of sensor of the light receiving unit 13 is not limited to the line sensor 14, and other sensors such as an area sensor used for the camera may be used.
  • the imaging element 15 is not limited to an equal-magnification optical system such as a rod lens as long as a clear image can be picked up by the sensor of the light receiving unit 13, and may be a reduction optical system. A structure without an optical system such as the child 15 may be used. Further, depending on the configuration of the imaging element 15, for example, using a mirror, the optical axis of the imaging element 15 and the imaging optical axis of the light receiving element 16 may not be on a straight line.
  • the substrate 17 includes a drive circuit for driving the light receiving element 16 and a signal processing circuit for processing and outputting a signal from the light receiving element 16.
  • the substrate 17 takes out and amplifies the output signal of each light receiving element 16 by AFE (Analog Front End), converts it to a digital value by an A / D converter, cuts the dark output, and outputs it to an image processing unit to be described later. .
  • AFE Analog Front End
  • the 1st light source 11 and the 2nd light source 12 are arrange
  • each of the light sources 11 and 12 is a linear light source, and when the valuable document 100 passes, it can irradiate at least a region including the linear imaged region 102 with linear light. it can.
  • the light sources 11 and 12 emit white light including red, green, and blue light.
  • the first light source 11 and the second light source 12 for example, a linear light source using an LED array in which red LED elements, green LED elements, and blue LED elements are arrayed or an LED array in which white LEDs are arrayed is used. be able to.
  • the linear light source which propagates the light from a red LED element, a green LED element, a blue LED element, or from white LED with a light guide, and irradiates light linearly can be utilized.
  • each of the light sources 11 and 12 is not particularly limited as long as it includes light having a wavelength corresponding to the color of the optical variable element region 101.
  • each of the light sources 11 and 12 may sequentially emit red, green, and blue light.
  • each light receiving element 16 may not be provided with a color selection filter.
  • the light sources 11 and 12 may be surface light sources.
  • the first light source 11 and the second light source 12 irradiate the valuable document 100 (optical variable element region 101) with light from the first direction and the second direction, respectively. It is arranged.
  • the light receiving unit 13 is disposed so as to receive light reflected from the valuable document 100 (optical variable element region 101) from the third direction. More specifically, the optical axes 11A and 12A of the light emitted from the first light source 11 and the second light source 12 are parallel to the first direction and the second direction, respectively, and have a refractive index of the transparent plate 19.
  • the value document 100 is arranged with an offset to the vertical line 103 side (Z-axis positive side) of the surface of the valuable document 100.
  • the optical axis 15A of each imaging element 15 and the imaging optical axis 16A of each light receiving element 16 are parallel to the third direction, and the vertical axis 103 side (Z-axis positive side) according to the refractive index of the transparent plate 19. It is offset and arranged.
  • the amount of offset of each optical axis is determined according to the refractive index and thickness of the transparent plate 19. Since the traveling direction of the light before entering the light transmitting plate 19 and the traveling direction of the light after passing through the light transmitting plate 19 are parallel to each other as shown in FIG. In the description regarding the angles formed by the first direction, the second direction, and the third direction and the vertical line 103, the description will be made without considering the offset of each optical axis unless otherwise required.
  • the angles formed by the first direction, the second direction, and the third direction with respect to the vertical line 103 of the surface of the valuable document 100 are the first angle ⁇ 1, the second angle ⁇ 2, and the third angle, respectively.
  • the first light source 11, the second light source 12, and the light receiving unit 13 are arranged such that ⁇ 1, ⁇ 2, and ⁇ 3 are different from each other. Thereby, the appearance of the color or the like of the optical variable element region 101 in the first image of the valuable document 100 by the first light source 11, and the color or the like of the optical variable element region 101 in the second image of the valuable document 100 by the second light source 12. As a result, the optical variable element region 101 can be detected.
  • the third angle ⁇ 3 is set to be 25 ° or more and less than 90 °.
  • ⁇ 3 is set to 25 ° or more, as described later, it is possible to clarify the difference between the color of the optical variable element region 101 in the first image and the color of the optical variable element region 101 in the second image.
  • the variable element region 101 can be detected with high accuracy.
  • ⁇ 3 is less than 25 °, these color changes are scarce and the detection accuracy of the optical variable element region 101 is significantly lowered.
  • the upper limit of the third angle ⁇ 3 is not particularly limited as long as it is within a range in which the reflected light on the surface of the valuable document 100 can be received, that is, less than 90 °, but is preferably 65 ° or less, and more preferably 60 ° or less. Preferably, it is 55 degrees or less.
  • the reflectance on the surface of the transparent plate 19 rapidly increases when the incident angle exceeds 65 °. Therefore, when ⁇ 3 exceeds 65 °, it is caused by the reflected light on the surface of the transparent plate 19. Thus, the first image and the second image may be unclear. If ⁇ 3 exceeds 60 °, it may be difficult to accommodate the light receiving unit 13 in the housing 18.
  • ⁇ 3 by setting ⁇ 3 to 55 ° or less, the color change between the optical variable element region 101 in the first image and the optical variable element region 101 in the second image can be made more reliable.
  • the first angle ⁇ 1 and the second angle ⁇ 2 are not particularly limited, but it is preferable to increase the color change of the optical variable element region 101. Accordingly, the first direction is preferably as close as possible to the vertical line 103, while the second direction is preferably as far away from the vertical line 103 as possible.
  • the specular reflection component from the second light source 12 may directly enter the light receiving unit 13 as described later.
  • the reflectance at the surface of the transparent plate 19 increases rapidly when the incident angle exceeds 65 °.
  • ⁇ 1 is preferably ⁇ 10 ° to 20 °
  • ⁇ 2 is preferably 40 ° to 70 °
  • ⁇ 1 is ⁇ 5 ° to 15 °
  • ⁇ 2 is 45 °. More preferably, it is ⁇ 65 °.
  • the first light source 11, the second light source 12, and the light receiving unit 13 are arranged in parallel along the linear imaged region 102. Therefore, as shown in FIGS. 4 and 6, the positional relationship between the reference surface 104 orthogonal to the imaging region 102 at an arbitrary position is the positional relationship as illustrated.
  • the transparent plate 19 is disposed between the first light source 11 and the second light source 12 and the valuable document 100. Therefore, as shown in FIG. 6, there is a region 19 ⁇ / b> R where regular reflection light from the transparent plate 19 can enter the light receiving unit 13.
  • the detection accuracy of the optical variable element region 101 decreases. Therefore, the first light source 11 and the second light source 12 are not disposed in the region 19R, but are disposed with the region 19R interposed therebetween. Thereby, regular reflection light from the transparent plate 19 is effectively suppressed from entering the light receiving unit 13.
  • an antireflection layer may be provided on at least one surface (preferably both surfaces) of the transparent plate 19, and this also reduces the incidence of regular reflection light from the transparent plate 19 on the light receiving unit 13. Is possible.
  • a 100 yuan banknote issued in 2005 (hereinafter referred to as a “100 yuan banknote”) and an optically variable ink of this book at various illumination angles of light sources and light receiving angles of various light receiving sections.
  • a transparent plate was not disposed, and a white light source (parallel light) was directly illuminated on the banknote and photographed by a line sensor.
  • the irradiation angle means an angle formed between the irradiation direction (optical axis) of the light source and the vertical line of the banknote surface, and corresponds to the above ⁇ 1 and ⁇ 2.
  • the light receiving angle means an angle formed between the imaging direction (imaging optical axis) of the line sensor and the vertical line of the banknote surface, and corresponds to the above ⁇ 3.
  • FIGS. 7A and 8A data of 5 ⁇ 5 pixels (0.5 mm ⁇ 0.5 mm) at the same place is obtained from images obtained under each condition. Extracted. The range of pixels to be extracted was determined so that the color change was large depending on the irradiation angle and the light receiving angle.
  • FIGS. 7B and 8B R, G, and B intensity distributions were calculated in the extracted range.
  • the average of each intensity of R, G, B is calculated, and the calculated average intensity of each of R, G, B is The ratio (color ratio) of R, G, and B to the entire average intensity was calculated.
  • variation of the blue color ratio at the time of changing an irradiation angle and a light reception angle was evaluated.
  • the reason why the blue color ratio is used is that the optically variable ink area of the 100 yuan banknote changes from green to blue as the irradiation angle and the light receiving angle increase, and the change of the blue component is large.
  • 9 to 11 show the results of normalizing the blue color ratio with the value of the irradiation angle of 60 ° for each medium.
  • the measurement was performed at an irradiation angle of 25 ° or more at a light reception angle of 0 ° and at an irradiation angle of 10 ° or more at a light reception angle of 15 °.
  • the variation of the blue color ratio when the irradiation angle is changed at any light receiving angle is small, but as shown in FIG. Then, when the light receiving angle was increased to some extent, the variation in the blue color ratio when the irradiation angle was changed increased.
  • Table 1 shows the results of calculating the blue increase rate by dividing the blue color ratio at the irradiation angle of 60 ° by the blue color ratio at the minimum irradiation angle at each light receiving angle.
  • the light receiving angle is 25 ° or more (preferably 30 ° or more), the change in the color of the optically variable ink region becomes sufficiently large, so that the optically variable ink region can be detected.
  • the blue increase rate of the coupon is small and the blue increase rate of the test sample is low. There is a risk of being confused with a large one.
  • the valuable document identification device and the valuable document identification method according to the present embodiment will be described in detail.
  • the valuable document identifying apparatus determines the presence or absence of an optical variable element region in the valuable document to be identified. Any valuable document provided with an optical variable element region can be applied regardless of the type of valuable document.
  • the optical variable element whose appearance changes depending on the observation angle
  • the optical that is observed at the position of the light receiving unit The change in the appearance of the variable element region is used. That is, the valuable document is irradiated with light from two different directions, and the reflected light information of the two optical variable element regions obtained by using the light from each direction, specifically, the valuable information based on the image information. It is determined whether or not the document has an optical variable element region.
  • the valuable document identification apparatus 1 includes a timing sensor 2 that detects the arrival of the valuable document 100, a roller (conveying mechanism) 3 that conveys the valuable document 100, and two image acquisitions.
  • Devices (image sensor units) 10a and 10b are provided on the Z axis direction positive side and the Z axis direction negative side of the transport surface, respectively.
  • Each of the image acquisition devices 10a and 10b has a configuration similar to that of the image acquisition device 10 described above.
  • the valuable document identification device 1 according to the present embodiment includes such two image acquisition devices 10a and 10b, thereby imaging one of the upper surface and the lower surface of the valuable document 100 or both the upper and lower surfaces of the valuable document 100.
  • the optical variable element region of the valuable document 100 can be imaged regardless of the front and back of the valuable document 100 that has been conveyed.
  • the timing sensor 2 has a function of detecting the arrival of the valuable document 100 to be identified, and is used to determine the timing for starting processing related to the valuable document 100.
  • the timing sensor 2 is formed by, for example, a light projecting unit and a light receiving unit.
  • the arrival of the valuable document 100 is detected by utilizing the fact that the light projected from the light projecting unit and received by the light receiving unit is blocked by the valuable document 100 conveyed between the light projecting unit and the light receiving unit. .
  • processing for capturing an image of the valuable document 100 is started. Details of these processes will be described later.
  • the roller 3 is driven by a driving device (not shown) such as a motor and functions as a transport mechanism that transports the valuable document 100 in the valuable document identification device 1.
  • the valuable document 100 received by the valuable document identification apparatus 1 is conveyed by a plurality of rollers 3 provided in the apparatus, passes between the image acquisition apparatuses 10a and 10b, and is discharged out of the apparatus.
  • Each roller 3 is installed so as to be rotatable in both clockwise and counterclockwise directions, and the rotation of these rollers 3 is controlled by a later-described conveyance control unit, whereby the valuable document 100 has an X-axis negative direction. It is conveyed in the direction.
  • the conveyance direction (X-axis direction) of the valuable document 100 is parallel to the longitudinal direction or the short direction of the valuable document 100.
  • the valuable document 100 may be conveyed in either the longitudinal direction or the short direction of the valuable document 100.
  • the appearance of the optical variable element region such as the color changes only when it is conveyed in a direction parallel to either the longitudinal direction or the lateral direction of the valuable document 100
  • the longitudinal direction or the short direction parallel to that direction is changed.
  • the valuable document 100 may be conveyed in the hand direction.
  • the method for transporting the valuable document 100 including the transport direction and the transport speed is appropriately determined according to the characteristics of the optical variable element so that the presence or absence of the optical variable element region can be detected by a method described later.
  • the valuable document identification device 1 includes a communication interface 4 (hereinafter referred to as “communication I / F”), a control unit 20 and a storage unit 30 as shown in FIG. have.
  • the control unit 20 also identifies the type of the valuable document 100 and the like, determines the presence / absence of the optical variable element region, the light source control unit 22 that controls each of the light sources 11 and 12, It has an image processing unit 23 that performs image processing of a captured image, and a conveyance control unit 24 that controls a conveyance mechanism such as a roller 3 that conveys the valuable document 100.
  • the storage unit 30 also includes a first image 31 of the valuable document 100 captured by the irradiation light from the first light source 11, and a second image 32 of the valuable document 100 captured by the irradiation light from the second light source 12.
  • Each of the images 31 and 32 obtained by capturing the valuable document 100 or various reference images 33 used for performing the determination processing of the characteristic portion and the like and information related thereto are stored.
  • the determination unit 21 compares the first image 31 or the second image 32 obtained by capturing the valuable document 100 with the reference image 33 stored in the storage unit 30 with respect to the valuable document 100 to be processed in advance. It has a function of specifying the type of document 100 and the like.
  • the storage unit 30 stores in advance a reference image of each dollar bill, $ 2, $ 5, $ 10, $ 20, $ 50, and $ 100. 33 is stored. Then, the characteristic portion of the image obtained by capturing the valuable document 100 being processed is compared with each reference image 33. As a result, if the characteristic portion of the image obtained by capturing the valuable document 100 matches the reference image 33 of the 100 dollar bill and is different from the reference image 33 of another denomination, the valuable document 100 is a 100 dollar bill. judge.
  • the determination unit 21 performs denomination identification as described above, authenticity determination for determining whether or not the banknote is genuine, and the banknote as a predetermined standard. It is also possible to perform processing such as damage determination for determining whether or not the bill is reusable.
  • Such a valuable document identification process is a technique conventionally used in the field of a valuable document identification apparatus, and thus detailed description thereof is omitted.
  • the determination unit 21 has a function of determining whether the valuable document 100 has the optical variable element region 101. Whether or not the valuable document 100 has the optical variable element region 101 is determined by using the first image 31 and the second image 32 obtained by capturing the valuable document 100, details of which will be described later.
  • the light source control unit 22 has a function of controlling lighting of the first light source 11 and the second light source 12 of each of the image acquisition devices 10a and 10b. In order to capture individual valuable document images from the light sources 11 and 12, dynamic lighting control is performed to turn on the light sources 11 and 12 in order.
  • the image processing unit 23 has a function of controlling light reception by the light receiving element 16 in accordance with the lighting timing of the light sources 11 and 12 controlled by the light source control unit 22. Further, it has a function of processing the output signal from the light receiving unit 13 and saving the first image 31 and the second image 32 in the storage unit 30. In addition, it also has a function of performing image processing on each of the images 31 and 32 in accordance with processing by the determination unit 21, and details thereof will be described later.
  • the storage unit 30 includes a storage device such as a volatile or nonvolatile memory or a hard disk, and is used to store various data necessary for processing performed by the valuable document identification device 1.
  • the communication I / F 4 has a function of receiving a signal from the outside of the valuable document identification device 1 and transmitting a signal from the valuable document identification device 1 to the outside.
  • the communication I / F 4 receives, for example, an external signal, changes the operation setting of the control unit 20, and performs update, addition, and deletion processing of software programs and data stored in the storage unit 30. Or the determination result of the valuable document 100 by the valuable document identification device 1 can be output to the outside.
  • control unit 20 includes, for example, a software program for realizing various processes, a CPU that executes the software program, and various hardware controlled by the CPU.
  • a storage unit 30 For storage of software programs and data necessary for the operation of each unit, a storage unit 30, a memory such as a RAM and a ROM provided separately, a hard disk, and the like are used.
  • the optically variable ink or the color shift ink is an optically variable ink (printing) depending on the light irradiation angle and the light receiving angle (observation direction). This is a special ink structure in which the color of the printed pattern), more specifically, the hue and / or lightness is observed to change.
  • the optically variable ink region 110 is provided with an optical interference structure composed of a multilayer thin film structure in which reflected lights at different interfaces interfere with each other. More specifically, as shown in FIG.
  • a multilayer thin film structure (light interference structure) 111 may be laminated on the base material 105 of the valuable document 100, or as shown in FIG.
  • a layer formed from an ink containing a multilayer thin film structure (light interference structure) 111 may be provided as the pigment.
  • the multilayer thin film structure 111 has a structure in which a reflective layer 112, a light transmission layer 113, and a coating layer 114 are laminated in this order from the substrate 105 side.
  • the multilayer thin film structure 111 has a structure in which the entire structure in which the reflective layer 112 is sandwiched between the light transmission layers 113 is covered with the coating layer 114.
  • the reflective layer 112 is formed from a metal such as aluminum
  • the light transmission layer 113 is formed from a light transmission material such as resin or glass
  • the coating layer 114 is a translucent metal layer. Acts as a mirror. With such a structure, light having a strengthening wavelength is emitted by interference between reflected light from the reflective layer 112 and reflected light from the coating layer 114. Then, the color of the interference light changes depending on the incident angle and the reflection angle. Further, by changing the thickness of the light transmission layer 113, inks of various colors can be produced.
  • the 100 yuan banknote changes from green to blue
  • the US 20 dollar banknote issued in 2003 changes from yellow to green
  • the 50 euro banknote issued in 2002 changes from purple to green
  • the 5 euro banknote issued in 2013 changes from green to blue.
  • the position of the light receiving unit 13 and the positions of the first light source 11 and the second light source 12 with respect to the light receiving unit 13 are adjusted so that the colors of the optically variable ink areas 110 to be different from each other. That is, the above-described angles ⁇ 1, ⁇ 2, and ⁇ 3 are adjusted so that images of the optically variable ink regions 110 of different colors are captured by the light sources 11 and 12, respectively.
  • step S1 when it is detected by the timing sensor 2 that the valuable document 100 has arrived at the valuable document identification device 1 (step S1; Yes), the control unit 20 performs lighting control of the light sources 11 and 12 by the light source control unit 22. At the same time, imaging of the valuable document 100 by the image processing unit 23 and storage processing of the captured image in the storage unit 30 are started (step S2).
  • the valuable document identification device 1 is in a state of monitoring the arrival of the valuable document 100 while the valuable document 100 is not detected (step S1; No).
  • step S2 the first image by the first light source 11 and the second image by the second light source 12 of the image acquisition device 10a and the image acquisition device during one transport of the valuable document 100 passing below the line sensor 14.
  • Four types of images ie, a first image by the first light source 11 and a second image by the second light source 12 are captured.
  • an image of only that side may be taken.
  • the optical variable ink region 110 is provided on the top surface of the valuable document 100, that is, the image acquisition device 10a side will be described.
  • the case where the optical variable ink region 110 is provided on the bottom surface of the valuable document 100 is described. Can be processed similarly.
  • the light source control unit 22 performs dynamic lighting control for repeatedly lighting the light sources 11 and 12 at different timings. Then, the reflected light emitted from each of the light sources 11 and 12 and reflected by the valuable document 100 is measured by the line sensor 14 of the light receiving unit 13. A signal measured by the line sensor 14 is input to the image processing unit 23.
  • the data appropriately processed by the image processing unit 23 is stored in the storage unit 30 as data forming the first image 31 and the second image 32. Data of each image 31 and 32 is stored for each color of red (R), green (G), and blue (B).
  • the light sources 11 and 12 are controlled to emit light at different timings, and signals measured by the light receiving unit 13 using the light sources 11 and 12 are sequentially stored in the storage unit 30.
  • the storage unit 30 stores the first image 31 and the second image obtained by capturing the entire surface of the valuable document 100 under the light sources 11 and 12.
  • the image 32 is stored.
  • Specific dynamic lighting control is not particularly limited. Further, if the first image 31 of the valuable document 100 by the first light source 11 and the second image 32 of the valuable document 100 by the second light source 12 can be captured separately, the light emission timings and data of the light sources 11 and 12 are obtained.
  • the order of processing is not particularly limited, and is determined as appropriate according to the processing speed of the line sensor 14 and the like. For example, when it is not required to process the valuable document 100 at a high speed, dynamic lighting is not performed, and the valuable document 100 is conveyed in the positive direction of the X axis and the first image 31 is captured by the first light source 11. Thereafter, the valuable document may be conveyed again in the negative direction of the X axis and the second image 32 by the second light source 12 may be captured.
  • the images 31 and 32 are preferably images obtained by capturing the entire surface of the valuable document 100 so that the images can be used for other identification processing performed using the valuable document image. Instead, it may be an image obtained by capturing only a partial area including the optical variable
  • the determination unit 21 determines the type (denomination in the case of banknotes) and direction of the valuable document 100 (step S3). Thereafter, the determination unit 21 determines whether or not the valuable document 100 has the optically variable ink area 110 (step S4). In the following, a case where a 100 yuan banknote is used will be described as appropriate, but any kind of valuable document 100 can be processed in the same manner.
  • the flow shown in FIG. 17 calculates the difference between the color of the optically variable ink area 110 of the first image 31 and the color of the optically variable ink area 110 of the second image 32, thereby calculating the optically variable ink area.
  • the presence or absence of 110 is determined.
  • FIG. 18 shows a case where 100 yuan banknotes are processed.
  • the image processing unit 23 corresponds to the optically variable ink region 110 from the first image 31.
  • a partial area image (hereinafter referred to as “first OVI image”) is extracted, and similarly, a partial area image corresponding to the optically variable ink area 110 from the second image 32 (hereinafter referred to as “second OVI image”). ) Is extracted (step S10).
  • a pixel at a specific position corresponding to the type and direction of the valuable document 100 may be extracted from each of the images 31 and 32 so as to be each OVI image.
  • a specific mask image corresponding to the type and direction of the valuable document 100 specifically, a mask image in which the optically variable ink portion is 1 and the other portion is 0 is multiplied with each image 31 and 32 to extract pixels.
  • Each OVI image may be used.
  • step S11 processing for calculating the evaluation value of the optically variable ink region 110 is performed (step S11).
  • FIG. 20 shows an example of measurement results and calculation results of a 100 yuan banknote under conditions of a light receiving angle of 45 °, an irradiation angle of 5 ° at the time of first image capturing, and an irradiation angle of 60 ° at the time of second image capturing.
  • the determination unit 21 performs the entire pixel of the optical variable ink unit, a specific pixel with the optical variable ink (for example, 10 ⁇ 10 pixels), or the optical variable ink region 110.
  • the average of each intensity is calculated for each color of R, G, and B in a specific row of pixels (step S20).
  • the determination unit 21 calculates a ratio (color ratio) between the calculated average intensities of R, G, and B for the first OVI image and the second OVI image (step S21).
  • the determination unit 21 compares the color ratio of a specific color between the first OVI image and the second OVI image (step S22). Specifically, for example, a change rate (increase rate) of the color ratio of the specific one color of the second OVI image with respect to the color ratio of the specific one color of the first OVI image is calculated, or the first OVI A ratio or a change rate of the color ratio of the specific two colors of the second OVI image to the ratio or difference of the color ratios of the specific two colors of the image is calculated.
  • the color to be used varies depending on the type (denomination) of the valuable document 100. For example, in 100 yuan banknotes, the color ratio of B or G may be compared to calculate the increase rate of B or G.
  • the presence or absence of the optically variable ink region 110 can be determined by comparing the first OVI image and the second OVI image with the first reference image and the second reference image recorded in the storage unit 30 in advance.
  • the first reference image and the second reference image are references corresponding to the first OVI image and the second OVI image obtained when the optical variable ink region 110 is imaged by the first light source 11 and the second light source 12, respectively. It is an image.
  • the determination unit 21 sets the value calculated in step S22 as an evaluation value (step S23).
  • the determination unit 21 compares the calculated evaluation value with a predetermined threshold value, and determines whether or not the evaluation value is larger than the threshold value (step S12 in FIG. 17). If the obtained evaluation value is larger than the threshold (step S13; Yes), it is determined that the valuable document 100 has the optical variable ink region 110. On the other hand, when the evaluation value is equal to or less than the threshold value (step S14; No), it is determined that the valuable document 100 does not have the optical variable ink area 110.
  • the determination result of the presence or absence of the optically variable ink area 110 obtained in this way is used as one of the determination conditions for determining the authenticity of the valuable document 100 inside the valuable document identification device 1 or output to the outside by the communication I / F 4. And used for processing in an external device.
  • the first light source 11, the second light source 12, and the line sensor 14 are arranged so that different colors can be obtained. Whether or not the valuable document 100 has the optical variable ink area 110 can be correctly determined from the difference in the color of the image of the optical variable ink area 110. If there is no optical variable ink area 110, it is processed as a fake ticket or a true / false uncertain ticket.
  • the evaluation value specifically blue color
  • a 100-yuan banknote this voucher
  • a test sample in which the design of the optically variable ink portion of the voucher is printed with general ink.
  • evaluation values were calculated for 1000 tickets and 250 test samples.
  • the irradiation angles were 5 ° and 60 °, and the light receiving angle was 45 °.
  • an evaluation value at a light receiving angle other than 45 ° is obtained by multiplying the evaluation value at each light receiving angle by a ratio of 45 ° to the light receiving angle.
  • a calculation example is shown in Table 3 below.
  • the verification results of these evaluation value distributions are shown in Table 4 below.
  • the threshold value was (average value ⁇ 3 ⁇ ).
  • the evaluation value of the ticket that is, the color change rate of the optically variable ink area 110 is small, so that the pass rate of the test sample is significantly increased. End up.
  • the light receiving angle is 25 ° or more, preferably 30 ° or more, the passing rate of the test sample can be 0%, and the presence or absence of the optically variable ink region 110 can be determined with very high accuracy. I found it possible. Therefore, the authenticity of the valuable document 100 can be determined with high accuracy.
  • the type of the valuable document 100 (denomination in the case of banknote) and the presence or absence of the optical variable element region 101 are determined.
  • the type of the valuable document 100 may be performed using another image acquisition device. Specifically, the type is determined based on the image of the valuable document 100 acquired by another image acquisition device arranged on the upstream side of the image acquisition devices 10a and 10b, and the image acquisition device and / or 10b is determined.
  • the presence / absence of the optical variable element region 101 may be determined based on the first image 31 and the second image 32 acquired in step S2.
  • the determination unit 21 may determine the type of the valuable document 100 based on the first image 31 or the second image 32 and information acquired by the sensor unit 215 described later. Thereafter, the determination unit 21 may specify the position of the optically variable ink area 110 and the position of the hologram area from the reference image 33 relating to the determined type of valuable document 100.
  • the presence or absence of the optical variable ink region 110 is determined based on the color difference between the first image 31 and the second image 32 at the position specified as the optical variable ink region 110, and the position specified as the hologram region
  • the presence / absence of the hologram region may be determined based on at least one difference in color, luminance, and shape between the first image 31 and the second image 32 in FIG.
  • the hologram region usually includes a light diffraction structure in which a diffraction grating is formed.
  • the valuable document identification apparatus 1 can be realized by itself, but the valuable document identification apparatus 1 is built in the valuable document processing apparatus as shown in FIG. 27 or 28, for example. To be used.
  • the valuable document processing apparatus 200 includes a hopper 210 on which a plurality of valuable documents 100 can be placed, a conveyance path 211 that conveys banknotes placed on the hopper 210, and a valuable value.
  • the stacking unit 213 that accumulates the valuable documents 100 identified by the valuable document identification device 1, the valuable document 100 that cannot be identified, and the valuable document 100 that satisfies a predetermined condition
  • a reject unit 214 that separates and accumulates the valuable documents 100.
  • the valuable document processing apparatus 200 includes a sensor unit 215 other than the line sensor 14 in accordance with the identification process of the valuable document 100 to be processed.
  • the sensor unit 215 for example, an optical line sensor for measuring optical characteristics of the valuable document 100 by irradiating a plurality of types of light such as infrared light, ultraviolet light, and visible light, or the valuable document 100.
  • processing of the valuable document identification device 1, specifically, the presence / absence of the optical variable ink region 110 is determined. For example, from the first image 31 and the second image 32 acquired by the image acquisition device 10a and / or 10b based on the type (denomination), direction, etc. of the valuable document 100 determined from the information acquired by the sensor unit 215. The position of the optical variable element region 101 to be extracted may be determined. By performing the role assignment in this way, the authenticity of the valuable document 100 can be determined with higher accuracy. Since the sensor unit 215 is a technique that has been conventionally used in the field of banknote processing devices, a detailed description thereof will be omitted.
  • the valuable document processing apparatus 300 is a small banknote processing apparatus that is installed on a table and used.
  • the valuable document identification apparatus (not shown) performs identification processing of the valuable document 100. )
  • Each stacker unit 306 has a display unit 305 for displaying information such as the banknote identification count result and the stacking status of each stacker unit 306.
  • the valuable document 100 determined to be a fake ticket or a genuine / indeterminate ticket without the optical variable element region may be returned to the reject unit 302 or may be stored in any stacker unit 306.
  • the first light source 11, the second light source 12, and the light receiving unit 13 are arranged so that the first angle ⁇ 1, the second angle ⁇ 2, and the third angle ⁇ 3 are different from each other.
  • ⁇ 3 is 25 ° or more and less than 90 °, the presence / absence of the optical variable element region 101 can be detected with high accuracy, and as a result, the authenticity determination accuracy of the optical variable element region 101 is improved. can do.
  • the light receiving element 16 may be an arrayed light receiving element as described above, or may be a single light receiving element such as a photodiode or a color sensor.
  • each light source 11 and 12 may be a point light source. In this case, the relationship between the light receiving element 16 and the light sources 11 and 12 is the same as that shown in FIGS.
  • the light sources 11 and 12 are point light sources, the light sources 11 and 12 are not limited to the reference plane 104 but can be positioned in any direction.
  • the present invention is a useful technique for accurately identifying the authenticity of a valuable document in which an optical variable element is employed to prevent forgery.
  • Valuable document identification device 2 Timing sensor 3: Transport mechanism 4: Communication interface 10, 10a, 10b: Image acquisition device (image sensor unit) 11: first light source 11A: optical axis 12 of the first light source 12: second light source 12A: optical axis 13 of the second light source 13: light receiving unit 14: line sensor 15: imaging element 15A: optical axis 16 of the imaging element: light reception Element 16A: Imaging optical axis 17 of the light receiving element 17: Substrate 18: Housing 19: Transparent plate 19R: Regular reflection light incident area 20: Control unit 21: Determination unit 22: Light source control unit 23: Image processing unit 24: Conveyance control unit 30 : Storage unit 31: first image 32: second image 33: reference image 100: valuable document 101: optical variable element region 102: imaged region 103: vertical line 104: reference surface 105: substrate 110: optical variable ink region 111: Multilayer thin film structure (light interference structure) 112: reflection layer 113: light transmission layer 114: coating layer 200: valuable document processing

Landscapes

  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Inspection Of Paper Currency And Valuable Securities (AREA)

Abstract

L'invention concerne : un appareil d'identification de document de valeur permettant d'améliorer la précision de détermination de la présence d'une zone d'élément variable optique sur une surface d'un document de valeur, ainsi que de déterminer très précisément l'authenticité d'un document de valeur ; un processeur de document de valeur ; une unité de capteur d'image ; et un procédé de détection de la zone d'élément variable optique. Selon l'invention, l'appareil d'identification de document de valeur comprend : une première source lumineuse et une seconde source lumineuse dont la lumière est appliquée à la zone d'élément variable optique à partir d'une première direction et d'une deuxième direction ; une unité de réception de lumière qui reçoit, d'une troisième direction, la lumière réfléchie par la zone d'élément variable optique ; et une unité de détermination qui détermine la présence de la zone d'élément variable optique d'après les informations concernant la lumière réfléchie de la première source lumineuse et les informations concernant la lumière réfléchie de la seconde source lumineuse. Un premier angle formé entre une ligne verticale par rapport à une surface du document de valeur et la première direction, un deuxième angle formé entre la ligne verticale et la deuxième direction ainsi qu'un troisième angle formé entre la ligne verticale et la troisième direction sont différents l'un de l'autre, le troisième angle n'étant pas inférieur à 25° mais inférieur à 90°.
PCT/JP2017/004779 2016-02-23 2017-02-09 Appareil d'identification de document de valeur, processeur de document de valeur, unité de capteur d'image et procédé de détection de zone d'élément variable optique Ceased WO2017145779A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201780008355.7A CN108496207B (zh) 2016-02-23 2017-02-09 有价票券识别装置、有价票券处理机、图像传感器单元及光学可变元件区域的检测方法

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2016032543A JP6751569B2 (ja) 2016-02-23 2016-02-23 有価書類識別装置、有価書類処理機、画像センサユニット及び光学可変素子領域の検出方法
JP2016-032543 2016-02-23

Publications (1)

Publication Number Publication Date
WO2017145779A1 true WO2017145779A1 (fr) 2017-08-31

Family

ID=59686563

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2017/004779 Ceased WO2017145779A1 (fr) 2016-02-23 2017-02-09 Appareil d'identification de document de valeur, processeur de document de valeur, unité de capteur d'image et procédé de détection de zone d'élément variable optique

Country Status (3)

Country Link
JP (1) JP6751569B2 (fr)
CN (1) CN108496207B (fr)
WO (1) WO2017145779A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2023157949A (ja) * 2018-05-11 2023-10-26 エルジー イノテック カンパニー リミテッド カメラモジュール及びこの動作方法

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP7496744B2 (ja) 2020-09-08 2024-06-07 グローリー株式会社 紙葉類識別装置、紙葉類処理装置及び紙葉類識別方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010277252A (ja) * 2009-05-27 2010-12-09 Toshiba Corp 紙葉類判別装置
JP2013020540A (ja) * 2011-07-13 2013-01-31 Glory Ltd 紙葉類識別装置及び紙葉類識別方法
JP2013527909A (ja) * 2010-01-07 2013-07-04 デ ラ ルー ノース アメリカ インコーポレイテッド 光学的可変材料を検出するためのシステムと方法
JP2014223768A (ja) * 2013-05-17 2014-12-04 凸版印刷株式会社 偽造防止媒体および偽造防止媒体の読取方法
JP2014240832A (ja) * 2013-05-17 2014-12-25 旭硝子株式会社 被検査物の検査方法、被検査物の検査装置およびガラス板の製造方法

Family Cites Families (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3223730B2 (ja) * 1994-11-30 2001-10-29 凸版印刷株式会社 不可視インキによるマークの真偽鑑定方法
US6473165B1 (en) * 2000-01-21 2002-10-29 Flex Products, Inc. Automated verification systems and methods for use with optical interference devices
US7672475B2 (en) * 2003-12-11 2010-03-02 Fraudhalt Limited Method and apparatus for verifying a hologram and a credit card
JP2006133054A (ja) * 2004-11-05 2006-05-25 Oki Electric Ind Co Ltd 干渉顔料検出装置
JP4073907B2 (ja) * 2004-11-16 2008-04-09 株式会社日本コンラックス 紙葉類識別装置
JP2007249656A (ja) * 2006-03-16 2007-09-27 Toshiba Corp ホログラム検査装置
JP4779792B2 (ja) * 2006-04-27 2011-09-28 凸版印刷株式会社 情報記録媒体、及び情報記録媒体の真偽判定装置
JP2007325050A (ja) * 2006-06-02 2007-12-13 Sharp Corp 画像読取り装置、画像読取り方法
JP2008257395A (ja) * 2007-04-03 2008-10-23 Toshiba Corp 紙葉類処理装置
JP2009157504A (ja) * 2007-12-25 2009-07-16 Toshiba Corp 紙葉類判別装置
CN101533536B (zh) * 2009-04-15 2010-08-18 谭一舟 用于鉴别纸币光谱差异及凹印特征的双光路成像装置
JP2010266647A (ja) * 2009-05-14 2010-11-25 Sony Corp ホログラム判定装置
JP2011107512A (ja) * 2009-11-19 2011-06-02 Osaka Univ 偏角画像撮像装置
CN101986353A (zh) * 2010-11-02 2011-03-16 北京新岸线软件科技有限公司 一种多角度光学特征检测方法及装置
CN102999964B (zh) * 2011-09-16 2015-02-11 谭伟基 变色油墨识别装置和纸币鉴伪装置
CN103018243B (zh) * 2011-09-27 2015-08-05 中钞特种防伪科技有限公司 用于屏蔽被检测物中的全息图文的装置

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010277252A (ja) * 2009-05-27 2010-12-09 Toshiba Corp 紙葉類判別装置
JP2013527909A (ja) * 2010-01-07 2013-07-04 デ ラ ルー ノース アメリカ インコーポレイテッド 光学的可変材料を検出するためのシステムと方法
JP2013020540A (ja) * 2011-07-13 2013-01-31 Glory Ltd 紙葉類識別装置及び紙葉類識別方法
JP2014223768A (ja) * 2013-05-17 2014-12-04 凸版印刷株式会社 偽造防止媒体および偽造防止媒体の読取方法
JP2014240832A (ja) * 2013-05-17 2014-12-25 旭硝子株式会社 被検査物の検査方法、被検査物の検査装置およびガラス板の製造方法

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2023157949A (ja) * 2018-05-11 2023-10-26 エルジー イノテック カンパニー リミテッド カメラモジュール及びこの動作方法
JP7633330B2 (ja) 2018-05-11 2025-02-19 エルジー イノテック カンパニー リミテッド カメラモジュール及びこの動作方法

Also Published As

Publication number Publication date
CN108496207A (zh) 2018-09-04
CN108496207B (zh) 2020-11-17
JP2017151654A (ja) 2017-08-31
JP6751569B2 (ja) 2020-09-09

Similar Documents

Publication Publication Date Title
EP1490828B1 (fr) Procede de verification du papier-monnaie
CN102610023B (zh) 用于有价证券鉴伪的光学检测装置及其检测方法
CN101986353A (zh) 一种多角度光学特征检测方法及装置
RU2598296C2 (ru) Способ проверки оптического защитного признака ценного документа
JP7473677B2 (ja) 光学センサ、紙葉類識別装置、紙葉類処理装置及び光検出方法
US8509492B2 (en) Detection of color shifting elements using sequenced illumination
WO2011036748A1 (fr) Dispositif d'identification de feuilles de papier et procédé d'identification de feuilles de papier
WO2018167876A1 (fr) Dispositif de détection de feuilles de papier, appareil de traitement de feuilles de papier et procédé de détection de feuilles de papier
JP5752549B2 (ja) 光学読取装置および紙葉類処理装置
CN103051825B (zh) 图像读取装置以及纸张类处理装置
JP2019040315A (ja) 不可視特性検知装置、シート識別装置、シート処理装置、印刷検査装置、及び不可視特性検知方法
JP4703403B2 (ja) 検査装置
JP6751569B2 (ja) 有価書類識別装置、有価書類処理機、画像センサユニット及び光学可変素子領域の検出方法
JP2020113270A (ja) 画像取得装置、紙葉類処理装置、紙幣処理装置及び画像取得方法
CN106780957B (zh) 图像获取装置、纸制品处理装置以及图像获取方法
JP4074917B1 (ja) 紙葉類識別装置
JP7508400B2 (ja) 重送検知装置及び重送検知方法
JP4062200B2 (ja) 紙葉類の鑑別装置および鑑別方法
WO2021193465A1 (fr) Capteur optique et dispositif d'identification de feuille de papier
US20250005940A1 (en) Paper sheet identifying device, paper sheet processing device, and paper sheet identification method
CN108604397A (zh) 有价票券处理装置及有价票券处理方法
JP7496744B2 (ja) 紙葉類識別装置、紙葉類処理装置及び紙葉類識別方法
JP7337572B2 (ja) 記番号読取装置、紙葉類処理装置、及び記番号読取方法
JP4377872B2 (ja) 表面検査装置
WO2014005085A1 (fr) Systèmes de capture d'images d'un document

Legal Events

Date Code Title Description
NENP Non-entry into the national phase

Ref country code: DE

121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 17756220

Country of ref document: EP

Kind code of ref document: A1

122 Ep: pct application non-entry in european phase

Ref document number: 17756220

Country of ref document: EP

Kind code of ref document: A1