WO2016052749A1 - 紙葉類識別装置及び紙葉類識別方法 - Google Patents
紙葉類識別装置及び紙葉類識別方法 Download PDFInfo
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- WO2016052749A1 WO2016052749A1 PCT/JP2015/078223 JP2015078223W WO2016052749A1 WO 2016052749 A1 WO2016052749 A1 WO 2016052749A1 JP 2015078223 W JP2015078223 W JP 2015078223W WO 2016052749 A1 WO2016052749 A1 WO 2016052749A1
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- light
- banknote
- light source
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- paper sheet
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Classifications
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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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
- G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
- G01N21/64—Fluorescence; Phosphorescence
-
- 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
- G07D7/06—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
- G07D7/1205—Testing spectral properties
-
- 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/27—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands using photo-electric detection ; circuits for computing concentration
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/59—Transmissivity
Definitions
- the present invention relates to a paper sheet identification device and a paper sheet identification method for acquiring optical characteristics of the paper sheet in order to identify the paper sheet.
- Patent Document 1 discloses that a paper sheet is irradiated with light of a predetermined wavelength, and the authenticity of the paper sheet is identified from features appearing in a spectrum of fluorescence emission or phosphorescence emission excited on the paper sheet.
- An apparatus is disclosed.
- Patent Document 2 a plurality of light sources having different light irradiation angles on a paper sheet are arranged, and the difference in reflection spectrum obtained by irradiating light from each light source is determined on the paper sheet.
- An apparatus for determining the presence or absence of a hologram is disclosed. In this apparatus, the authenticity of a paper sheet is identified by the presence or absence of a hologram on the paper sheet.
- the present invention has been made to solve the above-described problems caused by the prior art, and is a paper sheet identification device and a paper sheet that can efficiently acquire optical characteristics from a plurality of partial areas on the paper sheet.
- An object is to provide an identification method.
- the present invention identifies a paper sheet using a spectral spectrum acquired from the paper sheet by irradiating light on the paper sheet conveyed through the conveyance path.
- a light source unit including a plurality of light sources arranged corresponding to a plurality of partial areas on the paper sheet, and arranged to receive light from the plurality of partial areas.
- the light source unit for acquiring a spectral spectrum from a predetermined partial region on the paper sheet, a reading unit having a light receiving surface, a sensor unit for acquiring a spectral spectrum from light received on the light receiving surface Information for specifying at least one light source corresponding to the partial area among a plurality of light sources, information for specifying timing for turning on the at least one light source, and information for specifying timing for turning off the light source turned on at the timing
- the light that irradiates the paper sheet is obtained by obtaining reflected light from the paper sheet, obtaining transmitted light that has passed through the paper sheet, exciting fluorescence emission on the paper sheet, and phosphorescent light emission on the paper sheet. Irradiated from a light source for the purpose of excitation or the like.
- the present invention is characterized in that, in the above-mentioned invention, information for specifying a light emission amount when the at least one light source is turned on is stored in association with the spectroscopic measurement condition.
- the spectroscopic measurement condition further associates information specifying timing for starting acquisition of a spectroscopic spectrum by the sensor unit and information specifying timing for stopping acquisition of the spectroscopic spectrum. It is characterized by being stored.
- the present invention is characterized in that, in the above-described invention, the spectroscopic measurement condition further stores information specifying an adjustment amount of a signal gain when acquiring a spectroscopic spectrum by the sensor unit in association with each other. .
- the storage unit stores the spectroscopic measurement conditions for each type and direction of the paper sheet
- the light source control unit is a paper sheet transported through the transport path. Spectroscopic measurement conditions corresponding to the kind and direction of the class are read from the storage unit and the light source unit is controlled.
- the light source unit can irradiate at least two types of light having different wavelength ranges
- the information for specifying the light source under the spectroscopic measurement conditions includes information for specifying the type of light. It is characterized by.
- the present invention is the above invention, wherein the light source unit irradiates light from an upstream side in a transport direction with respect to a light receiving region on the paper sheet that receives light by the light receiving surface, and the light. And a light source that irradiates the light receiving region from the downstream side in the transport direction.
- a paper sheet image indicating the optical characteristics of the paper sheet is generated by representing the partial region from which the spectral spectrum is acquired based on the spectral spectrum acquired by the sensor unit as an image. It is characterized by doing.
- the present invention also relates to a paper sheet identification method for identifying a paper sheet using a spectral spectrum acquired from a paper sheet conveyed through a conveyance path, wherein the spectral spectrum is obtained by a light source unit including a plurality of light sources.
- Spectroscopy in which information for specifying at least one light source corresponding to the partial region for acquiring the information, information for specifying the timing for turning on the at least one light source, and information for specifying the timing for turning off the light source turned on at the timing are associated
- a spectroscopic measurement condition acquisition step for acquiring measurement conditions
- a light source control step for controlling the light source unit based on the acquired spectroscopic measurement conditions, and light from a plurality of partial regions on the paper sheet by the light receiving surface of the reading unit
- a spectral spectrum acquisition step of acquiring a spectral spectrum from the light received on the light receiving surface by the sensor unit.
- a plurality of light sources arranged so as to be able to irradiate light are provided to each of a plurality of partial areas on a paper sheet, and a light source that is turned on among these light sources, and a timing at which the light source starts to be turned on Each light source can be controlled based on a spectroscopic measurement condition in which the timing for turning off the light source is set.
- a desired identification on the paper sheet can be obtained by the paper sheet identification device capable of receiving light from the entire main scanning direction on the paper sheet by the reading unit and acquiring a spectral spectrum from the received light by the sensor unit. It is possible to irradiate only the partial area with light and obtain a spectral spectrum from this partial area.
- spectroscopic measurement conditions it is possible to acquire spectral spectra from a plurality of partial areas on a paper sheet conveyed on the conveyance path. For example, a plurality of parts at positions separated in the main scanning direction It is also possible to acquire a spectral spectrum simultaneously in a region, or to sequentially acquire a spectral spectrum over the entire surface of a paper sheet by alternately lighting each light source.
- the amount of light emitted when the light source is turned on can be specified as a spectroscopic measurement condition, so that the amount of light emitted from the light source can be reduced according to the light emission phenomenon excited by the paper sheet. Can be adjusted.
- the timing for acquiring a spectral spectrum can be specified as a spectroscopic measurement condition, so that, for example, both fluorescent and phosphorescent spectral spectra can be acquired from the same partial region.
- the signal gain when acquiring the spectrum can be specified as the spectroscopic measurement condition. For example, even when the emission intensity of phosphorescence is weak, The signal gain can be adjusted so that features such as peaks clearly appear.
- the present invention for example, to identify the paper sheet based on the identification result of the type and direction of the paper sheet obtained by using a conventional line sensor, magnetic sensor, thickness sensor or the like. Since the spectral spectrum can be acquired only on the partial region necessary for the processing, the processing load related to the acquisition of the spectral spectrum can be reduced.
- the type of light emitted toward the paper sheet can be specified as a spectroscopic measurement condition. For example, in order to excite light emission in each partial region such as ultraviolet light and infrared light. The necessary light can be selected and irradiated.
- the present invention when irradiating light toward the paper sheet, the light is irradiated from both the upstream side and the downstream side in the transport direction with respect to the partial region on the paper sheet from which the spectrum is acquired. Therefore, for example, even when a paper sheet has a wrinkle or a crease, light emission can be surely excited to emit light.
- the present invention it is possible to generate a paper sheet image reflecting the characteristics appearing in the spectral spectrum by using the spectral spectrum acquired from the paper sheet.
- the denomination, authenticity, etc. of the banknote can be identified by comparison with a banknote image prepared in advance according to the above.
- FIG. 1 is a schematic diagram illustrating a configuration example of a banknote processing apparatus that uses the paper sheet identification apparatus according to the present embodiment as an identification unit.
- FIG. 2 is an external view showing the configuration of the spectroscopic unit.
- FIG. 3 is a schematic diagram illustrating a schematic configuration of the light source unit and the reading unit.
- FIG. 4 is a schematic diagram illustrating an example in which the reading unit and the light guide unit are formed by a plurality of light guide plates.
- FIG. 5 is a block diagram showing a schematic functional configuration of the identification unit.
- FIG. 6 is a diagram for explaining a method for acquiring data relating to optical characteristics from the entire bill surface.
- FIG. 7 is a diagram showing a method for measuring the entire surface of the banknote and acquiring data relating to optical characteristics from a partial region on the banknote.
- FIG. 8 is a diagram illustrating an example of a banknote in which fluorescence emission is observed in three partial regions.
- FIG. 9 is a diagram for explaining the spectroscopic measurement conditions set for the banknote shown in FIG.
- FIG. 10 is a schematic diagram showing the banknote image of the banknote shown in FIG. 8 generated based on the spectral spectrum.
- FIG. 11 is a diagram illustrating an example of a banknote in which fluorescence emission and phosphorescence emission are observed.
- FIG. 12 is a diagram for explaining the spectroscopic measurement conditions set for the banknote shown in FIG. FIG.
- FIG. 13 is a schematic diagram showing a banknote image of the banknote shown in FIG. 11 generated based on the spectral spectrum.
- FIG. 14 is a flowchart illustrating a case where the processing by the identification sensor unit and the processing by the spectroscopic unit are performed in series.
- FIG. 15 is a flowchart illustrating a case where the processing by the identification sensor unit and the processing by the spectroscopic unit are performed in parallel.
- the paper sheet identification apparatus has a function of identifying the type, authenticity, correctness, and the like of the paper sheet based on the optical characteristics of the paper sheet acquired by the spectroscopic unit.
- the paper sheet identification device the paper sheet is divided into a plurality of regions from a plurality of light sources arranged in the main scanning direction of the sensor that acquires the spectral spectrum. Specify at least one light source that irradiates light to a partial area to be measured among the partial areas, and irradiate the type (wavelength) of light emitted from the light source, the amount of light, the timing of starting the light irradiation, and the light. Time etc. can be controlled. Thereby, it is possible to irradiate a desired partial region on the paper sheet with light and obtain a spectral spectrum of light excited in this partial region.
- At this time by controlling the lighting timing and extinguishing timing of the light source and the timing of acquiring a signal from the sensor, at least one of fluorescence emission and phosphorescence emission can be measured. Further, in the paper sheet identification device, at least one of a current value and a light emission time for controlling the light emission amount of light emitted from the light source so that a characteristic part such as a peak appearing on the signal waveform of the spectral spectrum becomes clear. One of them can be adjusted, and it is also possible to adjust at least one of the gain and the measurement time of a signal obtained by measuring the light emission excited by the paper with a sensor.
- the light source is used for the purpose of obtaining reflected light from paper sheets, obtaining transmitted light transmitted through the paper sheets, exciting fluorescence on the paper sheets, exciting phosphorescence on the paper sheets, etc.
- the paper sheet identification device by controlling the light source and the sensor, at least one of a reflection spectrum, an absorption spectrum, a transmission spectrum, a fluorescence spectrum, and a phosphorescence spectrum is acquired as a spectrum. Can do. Below, the example which irradiates excitation light to a paper sheet from a light source and measures the spectrum of excited light emission mainly is demonstrated.
- the paper sheet identification device can process various types of paper sheets such as banknotes, checks, and other securities, but in the following, the paper sheet identification device is a banknote processing target. The details will be described by taking as an example the case of being used as an identification unit in the bill processing apparatus.
- FIG. 1 is a schematic diagram showing a schematic configuration of a bill processing apparatus 2 that uses a paper sheet identification apparatus 1 (hereinafter referred to as “identification unit 1”) according to the present embodiment.
- the banknote handling apparatus 2 includes a deposit slot 10 on which a plurality of banknotes can be placed, a conveyance path 60 that conveys banknotes fed from the deposit slot 10 one by one into the apparatus, and a banknote that is conveyed on the conveyance path 60.
- the identification unit 1 for identifying the denomination, true / false, damage, etc., the storage unit 40 for storing the banknotes identified as storable in the apparatus according to the identification result by the identification unit 1, and the identification unit 1 cannot be identified.
- a reject port 50 for discharging reject banknotes such as banknotes and counterfeits.
- the identification unit 1 includes a line sensor for acquiring an image of a banknote, a magnetic sensor for acquiring a magnetic characteristic of the banknote, a sensor unit for identification 20 including a thickness sensor for measuring the thickness of the banknote, and the like. And a spectroscopic unit 30 for acquiring a spectrum. Since the conventional technology can be used for the banknote recognition process performed by the identification unit 1 using the identification sensor unit 20 and the banknote processing apparatus 2 performed according to the identification result, detailed description thereof is omitted. Hereinafter, details of the spectroscopic unit 30 will be described.
- FIG. 2 is an external view for explaining the configuration of the spectroscopic unit 30.
- FIG. 2A shows a plan view seen from above the transport path 60 (Z-axis positive direction)
- FIG. 2B shows a plan view seen from the side of the transport path (X-axis positive direction). The figure is shown.
- the banknote 100 is transported between an upper guide 61 and a lower guide 62 that form the transport path 60.
- the spectroscopic unit 30 includes a light source unit 31, a reading unit 32, a light guide unit 33, and a sensor unit 34.
- the light source unit 31, the reading unit 32, and the sensor unit 34 transmit light so that noise light does not enter from the outside. It is housed in a box-shaped case made of black resin or metal. Further, the light guide unit 33 that connects the reading unit 32 and the sensor unit 34 disposed at a position away from the reading unit 32 and guides the light received by the reading unit 32 to the sensor unit 34 becomes noise. It is housed in a cylindrical case made of black soft resin or fiber that does not transmit light so that light does not enter from the outside and can be bent. Thereby, in the spectroscopic unit 30, only the light received by the reading unit 32 is guided to the sensor unit 34 through the light guide unit 33.
- the reading unit 32 is arranged on the conveyance path 60 so that the main scanning direction is orthogonal to the conveyance direction of the banknote 100 (white arrow in FIG. 2).
- the light source unit 31 is disposed in correspondence with the reading region so that the reading unit 32 irradiates the reading region where the optical characteristics of the banknote 100 are read.
- the arrangement position of the sensor unit 34 that acquires the spectral spectrum by the light received by the reading unit 32 is not particularly limited, and the light received by the reading unit 32 is guided to the sensor unit 34 by the bendable light guide unit 33. It has become. Then, the data relating to the spectral spectrum obtained by the sensor unit 34 is input to an identification processing unit (see FIG. 5) for identifying the denomination, authenticity, correctness, etc. of the banknote 100.
- the light source unit 31 is disposed below the transport path 60 (Z-axis negative direction), so that the transport path 60 is
- the spectroscopic unit 30 and the light source unit 31 are arranged on the upper side of the conveyance path 60, and the bill The case where the reflection spectrum of the upper surface of 100 is acquired will be described as an example.
- FIG. 3 is a schematic diagram showing a schematic configuration of the light source unit 31 and the reading unit 32.
- FIG. 3A is a perspective view showing the internal structure of the reading unit 32
- FIG. 3B is a cross-sectional view of the inside of the light source unit 31 as seen from the X-axis negative direction side. These show the top view which looked at the bottom face of the light source part 31 which opposes the conveyance path 60 from the Z-axis negative direction side.
- 16 optical fibers that receive light from above the bill 100 so that light can be received from the entire main scanning direction (X-axis direction) of the bill 100.
- the light receiving surfaces 501 to 516 are arranged at equal intervals in a line in the X-axis direction.
- the light guide portion 33 is formed by bundling these 16 optical fibers. Light received by the light receiving surfaces 501 to 516 on one end side of the optical fiber is guided through the optical fiber forming the light guide portion 33 into the sensor portion 34 from the other end side.
- a transparent member 311 that can irradiate the banknote 100 with light and receive light from the banknote 100 is fitted into the bottom surface of the light source unit 31.
- the light receiving surfaces 501 to 516 of the reading unit 32 are fixed in a state where they are exposed from the bottom surface of the reading unit 32.
- Light emitted from the plurality of light sources 601 a to 608 a and 601 b to 608 b forming the light source unit 31 is transmitted through the transparent member 311 to be applied to the bill 100, and the light reflected by the bill 100 is transmitted through the transparent member 311. Light is received by the light receiving surfaces 501 to 516 of the reading unit 32.
- sixteen light sources 601a to 608a arranged at equal intervals in a line in the X-axis direction and eight light sources 601b to 608b arranged at equal intervals in a line in the X-axis direction.
- the sixteen light receiving surfaces 501 to 516 are arranged symmetrically with respect to a line (broken line in the figure) arranged in one row.
- the 16 light sources 601a to 608a, 601b to 608b, and the 16 light receiving surfaces 501 to 516 are divided into 8 sets, each including 2 light sources and 2 light receiving surfaces.
- two adjacent light receiving surfaces 501 and 502, one light source 601a on the Y axis positive direction side with respect to these, and one light source 601b on the Y axis negative direction side, Is one set.
- the light source 601a and the light source 601b are on the center line parallel to the Y axis between the light receiving surface 501 and the light receiving surface 502, and the distance from the light receiving surface 501 to the light source 601a, the distance from the light receiving surface 501 to the light source 601b, and the light receiving surface 502
- the distance from the light source 601a and the distance from the light receiving surface 502 to the light source 601b are all equal.
- the arrangement relationship between the two light receiving surfaces and the two light sources forming each of the eight groups is the same.
- each of the light sources 601a to 608a and 601b to 608b one or a plurality of light emitting elements such as LEDs are used.
- one light emitting element that emits only light of one wavelength may be used as one light source 601a, or a plurality of light emitting elements that emit light of different wavelengths may be used as one light source 601a.
- One light emitting element that can emit light may be used as one light source 601a.
- the type of the light emitting element to be used is determined according to the type of light necessary to excite light emission by the banknote 100. In the following description, it is assumed that at least one of infrared light and ultraviolet light can be emitted from each of the light sources 601a to 608a and 601b to 608b.
- FIG. 4 is a schematic diagram illustrating an example in which the reading unit 32 and the light guide unit 33 are formed by a plurality of light guide plates 401 to 404.
- the reading unit 32 and the light guide unit 33 are formed by a plurality of light guide plates 401 to 404.
- FIG. 4B four light guide plates 401 to 404 supported by a base 322 are housed in a cover 321.
- each of the light guide plates 401 to 404 has four light receiving surfaces, and the 16 light receiving surfaces 501 to 516 of the reading unit 32 are formed by these light receiving surfaces. .
- the light source unit 31 including the transparent member 311 and the case 312 has a plurality of light sources 601a to 608a and 601b to 608b. As shown in FIG. 4C, each light source 601a to 608a, 601b to 608b and each light receiving unit.
- the surfaces 501 to 516 are arranged in the same positional relationship as that in FIG.
- the sensor unit 34 When the sensor unit 34 receives light received by the reading unit 32 and guided by the light guide unit 33, the sensor unit 34 converts the light into a scattering plate, a first 45-degree polarizing plate, a Wollaston prism, and a second 45-degree polarized light. Using a plate, the light is separated into extraordinary light and ordinary light, and an image is formed on a CCD sensor by a lens, thereby obtaining a spectral spectrum.
- FIG. 5 is a block diagram showing an outline of the functional configuration of the identification unit 1.
- the identification unit 1 includes the identification sensor unit 20 and the spectral unit 30 shown in FIG. 1, a control unit 70, a storage unit 80, and a display unit 90 that can display a spectral spectrum, a banknote image, and the like.
- the control unit 70 includes a conveyance information acquisition unit 71, a light source control unit 72, a data acquisition unit 73, and an identification processing unit 74. Below, the function and operation
- the conveyance information acquisition unit 71 has a function of acquiring the conveyance information of the banknote 100 by the conveyance path 60 and specifying the conveyance position of the banknote 100 on the conveyance path 60. For example, based on the conveyance speed of the banknote 100 conveyed by a conveyance roller or a conveyance belt, the detection result by the detection sensor which detects passage of a banknote in the predetermined position on the conveyance path 60, etc. of the banknote 100 on the conveyance path 60 Specify the transport position. With the function of the conveyance information acquisition unit 71, it is possible to specify the timing at which the banknote 100 passes through the reading area on the conveyance path 60 where the light source unit 31 emits light and the reading unit 32 reads the light.
- the light source control unit 72 has a function of controlling the operation of the light source unit 31 based on the transport position of the banknote 100 on the transport path 60 specified by the transport information acquisition unit 71. Specifically, the light source control unit 72 uses a plurality of LEDs or the like to irradiate light toward the banknote 100 in accordance with the timing when the banknote 100 passes through the reading area of the light receiving surfaces 501 to 516 of the reading section 32.
- the light source unit 31 having the light sources 601a to 608a and 601b to 601b selects an LED to be lit.
- the light source control unit 72 controls the light emission amount of the LED by controlling the timing of lighting the selected LED, the lighting time of the LED, the current value at the time of lighting the LED, and the like.
- the data acquisition unit 73 controls the operation of the identification sensor unit 20 such as a line sensor, a magnetic sensor, or a thickness sensor based on the transport position of the banknote 100 on the transport path 60, and the image of the banknote 100 and the magnetic characteristics. It has a function of acquiring data relating to characteristics of the banknote 100 such as thickness. In addition, the data acquisition unit 73 controls the operation of the sensor unit 34 based on the position of the banknote 100 on the transport path 60 specified by the transport information acquisition unit 71, and obtains data related to the optical characteristics of the banknote 100. Has a function to acquire. The data acquisition unit 73 has a function of adjusting at least one of the gain of the signal output from the sensor unit 34 and the measurement time in accordance with the emission intensity of the light excited on the banknote 100.
- the identification unit 1 even if the light emission intensity excited on the banknote 100 is weak due to the functions of the light source control unit 72 and the data acquisition unit 73, the light emission emitted from the light source unit 31 according to the light emission intensity. At least one of a current value for controlling the amount, a time for irradiating light from the light source unit 31, a gain of a signal when the sensor unit 34 measures light emission excited by the bill 100, and a measurement time for measuring light emission The signal intensity of the spectral spectrum acquired from the banknote 100 can be adjusted.
- the identification processing unit 74 has a function of identifying the denomination, authenticity, and the like of the banknote 100 based on the data acquired by the data acquisition unit 73 using the identification sensor unit 20.
- the identification processing unit 74 has a function of identifying the denomination, authenticity, and the like of the banknote 100 based on the data acquired by the data acquisition unit 73 using the spectroscopic unit 30.
- the storage unit 80 is a non-volatile storage device such as a semiconductor memory used for storing the spectroscopic measurement conditions 81 and the identification data 82.
- the light source control unit 72 and the data acquisition unit 73 operate based on the spectroscopic measurement condition 81.
- the identification data 82 stored in the storage unit 80 is data used to identify the denomination, authenticity, etc. of the banknote 100 based on the data acquired by the identification sensor unit 20 and the spectroscopic unit 30. For example, for each denomination of the banknote 100, data obtained from the banknote 100 using the identification sensor unit 20, data obtained from the banknote 100 using the spectroscopic unit 30, and the like are stored in advance as identification data 82. ing.
- the identification processing unit 74 compares the data obtained by using the identification sensor unit 20 from the banknote 100 transported on the transport path 60 with the identification data 82, whereby the money of the banknote 100 on the transport path 60 is compared. Identify seeds, transport status, etc.
- the identification processing unit 74 identifies the denomination of the conveyed banknote 100 by comparing the data obtained from the conveyed banknote 100 using the spectroscopic unit 30 with the identification data 82. Similarly, the identification processing unit 74 also uses the identification data 82 to identify whether the banknote 100 is authentic or not.
- the spectroscopic measurement condition 81 stores the measurement condition for acquiring a spectroscopic spectrum from a predetermined partial region on the banknote 100.
- information for specifying at least one light source that irradiates light toward a partial region among the plurality of light sources 601 a to 608 a and 601 b to 608 b included in the light source unit 31, on the conveyance path 60 information for specifying the timing for turning on the light source in accordance with the transport position of the banknote 100, information for specifying the timing for turning off the light source that has been turned on, and the like are stored in an associated state.
- the spectroscopic measurement condition 81 includes, in addition to this, a current value when the light source is turned on, information for specifying the timing at which the data acquisition unit 73 starts acquisition of a signal related to the spectral spectrum from the sensor unit 34, and from the sensor unit 34.
- the information for specifying the timing to stop the acquisition of the signal, the information for specifying the gain adjustment amount of the signal acquired from the sensor unit 34, and the like are also included.
- the light source control unit 72 controls the light source unit 31 by referring to the spectroscopic measurement condition 81 if the denomination, front / back direction, and top / bottom direction of the banknote 100 transported through the transport path 60 can be specified.
- the method and the acquisition method of the data from the sensor part 34 by the data acquisition part 73 are determined, and the spectrum can be acquired from the banknote 100 on the conveyance path 60.
- the identification processing unit 74 first acquires data using the identification sensor unit 20 disposed on the upstream side in the transport direction from the spectroscopic unit 30, and stores the banknote 100 such as denomination and old and new. While specifying a kind, the conveyance state of the banknote 100 is specified, such as whether the banknote 100 is conveyed by making the upper surface into the upper surface, and which direction the banknote 100 is set to the conveyance direction front.
- the light source control unit 72 refers to the spectroscopic measurement condition 81 based on the information related to the type and conveyance state of the banknote 100 specified by the identification processing unit 74, thereby emitting light that is excited on the banknote 100.
- the data acquisition unit 73 based on the spectroscopic measurement condition 81, the type of light emission excited on the banknote 100, the partial area on the banknote 100 where the light emission is excited, and the light emission excited in the partial area. And the positional relationship between the partial area and the light receiving surfaces 501 to 516 of the reading unit 32 are recognized. In this way, a method for exciting light emission on the banknote 100 and a method for measuring excited light emission are set.
- the light source control unit 72 causes the light source unit 31 to synchronize with the timing when the banknote 100 transported through the transport path 60 passes through the reading region by the spectroscopic unit 30.
- the data acquisition unit 73 acquires data relating to the spectral spectrum from the sensor unit 34 by irradiating light by controlling the above. By irradiating a predetermined partial region on the banknote 100 with predetermined light from the thus obtained spectral spectrum, it can be determined whether or not predetermined light emission has been excited. Thereby, the identification accuracy of the banknote 100 can be improved by using the data obtained by the data acquisition unit 73 for the identification process of the banknote 100 by the identification processing unit 74.
- the identification unit 1 can measure the spectral spectrum on the entire surface of the bill 100 by setting based on the spectral measurement condition 81, or can acquire the spectral spectrum from only one or a plurality of partial regions. Moreover, it can respond
- the light source unit 31 includes a first light source unit 31a that irradiates ultraviolet light (hereinafter “UV light”) and a second light source unit 31b that irradiates infrared light (hereinafter “IR light”). A specific method for acquiring a spectral spectrum will be described as an example.
- UV light ultraviolet light
- IR light infrared light
- the first light source unit 31a and the second light source unit 31b are realized by the light sources 601a to 608a and 601b to 608b. Specifically, it is possible to irradiate at least one of UV light and IR light from each of the light sources 601a to 608a and 601b to 608b, and the first light source unit 31a irradiates the UV light. When controlled, UV light is emitted from the light sources 601a to 608a and 601b to 608b. When the second light source unit 31b is controlled to irradiate IR light, the IR light is emitted from the light sources 601a to 608a and 601b to 608b.
- FIG. 6 is a diagram for explaining a method of acquiring data relating to optical characteristics from the entire surface of the banknote 100 by controlling the operation of the spectroscopic unit 30.
- FIG. 6A shows a channel formed by the light receiving surfaces 501 to 516 of the spectroscopic unit 30 and the light sources 601a to 608a and 601b to 608b.
- FIG. 6B shows blocks 701 to 740 in which the entire surface of the banknote 100 is divided into a plurality of partial areas corresponding to the respective channels shown in FIG.
- FIG. 6C shows a spectroscopic measurement condition 81 showing a control method of the light source unit 31 and the sensor unit 34 for acquiring data from all the blocks 701 to 740 shown in FIG.
- FIG. 6D shows a control method of the first light source unit 31a, the second light source unit 31b, and the sensor unit 34 based on the spectroscopic measurement condition 81 shown in FIG.
- the spectroscopic unit 30 controls the light receiving surface 501, the light receiving surface 502, the light source 601a, and the light source 601b as one set (one channel). Similarly, by performing channel setting with a combination of two light receiving surfaces and two light sources, the spectroscopic unit 30 is divided into eight channels 1 to 8 (Ch1 to Ch8 in the figure).
- the upward direction of the drawing is the conveyance direction of the banknote 100.
- the light source unit 31 turns on the light sources 601 a and 601 b of the channel 1 at a timing when the block 701 illustrated in FIG. 6B overlaps with the reading region by the reading unit 32 immediately below the spectroscopic unit 30.
- the reflected light from the banknote 100 is received by the light receiving surfaces 501 and 502 of the reading unit 32, whereby the spectral spectrum of the block 701 can be acquired by the sensor unit 34.
- the sensor unit 34 obtains a spectral spectrum from the light received by all the light receiving surfaces 501 to 516 using a prism or the like. Only the light sources 601a and 601b of the channel 1 are turned on to emit light to the block 701. By irradiating, the light receiving surfaces 501 and 502 receive the reflected light from the block 701, and the spectral spectrum of the block 701 can be acquired. That is, when light is emitted from the light source toward the partial region on which the spectral spectrum is to be acquired on the banknote 100 in an environment where only the light from the light source is irradiated on the banknote 100 without light that becomes noise, this partial area The light excited by is read, and a spectrum can be acquired.
- the banknote 100 continues to be transported on the transport path 60 while irradiating the block 701 with light and acquiring data, so when acquiring data from the block 702 after acquiring data from the block 701,
- the position of the block 702 is shifted from the block 701 in the direction opposite to the conveying direction (downward in the drawing).
- the conveyance speed of the banknote 100 is 2000 mm / S and the time required for data acquisition of the block 701 is 500 ⁇ S
- the shift amount in the conveyance direction between the block 701 and the block 702 is 1 mm.
- the amount of deviation in the transport direction is 8 mm in one row of blocks 701 to 708, but banknotes that are transported at high speed can be obtained by setting the blocks 701 to 740 with respect to the banknote 100 as shown in FIG. A spectrum can be acquired from each of the blocks 701 to 740 for the entire surface of 100.
- FIG. 6C shows a spectroscopic measurement condition 81 for acquiring a spectroscopic spectrum in order from the entire surface of the banknote 100, that is, the blocks 701 to 740 shown in FIG.
- the spectroscopic measurement condition 81 “No.” indicating the measurement order, “Bill position” indicating the position of the banknote 100 on the transport path 60 in millimeters, “Sensor” in which the measurement method by the sensor unit 34 is set, UV
- first light source that sets the control method of the first light source unit 31a that irradiates light
- second light source that sets the control method of the second light source unit 31b that irradiates IR light
- the spectroscopic measurement condition 81 in FIG. 6C shows an example in which the entire surface of the bill 100 is irradiated with UV light and fluorescence emission is measured.
- the setting content is such that only the first light source unit 31a is used to irradiate UV light, and the fluorescence excited on the banknote 100 is measured while the UV light is irradiated.
- the position of the banknote 100 on the transport path 60 when the spectroscopic unit 30 starts the measurement of the block 701 shown in FIG. The banknote position of the banknote 100 after 500 ⁇ S after the measurement of the block 701 is 1 mm, and the banknote position of the banknote 100 after 500 ⁇ S is 2 mm.
- the banknote 100 is included in the “measurement start” item in the sensor item of the spectroscopic measurement condition 81, the “lighting start” item in the first light source item, and the “lighting start” item in the second light source item.
- the timing at which the banknote position is reached is set to 0 (zero), and the number of seconds after which measurement or lighting is started is shown.
- the sensor item of 0 indicates that the measurement by the sensor unit 34 is started with a gain of 1 at the timing when the banknote position becomes 0 mm (0 ⁇ S), and the measurement is terminated when it reaches 500 ⁇ S. ing.
- the item of the first light source of 0 is the timing (0 ⁇ S) when the bill 100 reaches the bill position of 0 mm, the current value is 10 mA, the light sources 601a and 601b of the channel 1 of the first light source unit 31a are turned on, and the UV light It shows that the light sources 601a and 601b are turned off when the time of 500 ⁇ S has elapsed from the start of irradiation.
- FIG. 6D is a timing chart showing a control method of the first light source unit 31a, the second light source unit 31b, and the sensor unit 34 performed based on the spectroscopic measurement condition 81 shown in FIG.
- the timing chart according to the present embodiment including FIG. 6D shows that the time elapses as it proceeds in the right direction, and the elapse of this time is indicated by the scale of the uppermost banknote position.
- the numerical value of the banknote position corresponds to the banknote position of the spectroscopic measurement condition 81, and one scale per 1 mm indicates a time of 500 ⁇ S.
- the light sources that are turned on to acquire the spectral spectrum are indicated by the charts of the first light source unit 31a and the second light source unit 31b and the charts of the channels 1 to 8 (Ch1 to 8 in the figure).
- the charts of the first light source unit 31a and the second light source unit 31b and the charts of the channels 1 to 8 are indicated by the charts of the first light source unit 31a and the second light source unit 31b and the charts of the channels 1 to 8 (Ch1 to 8 in the figure).
- the charts of the sensor unit 34 shows a state in which the measurement is not performed in the OFF state, and the spectral state is measured by receiving light from the light receiving surfaces 501 to 516 of the reading unit 32 in the ON state. Show.
- the UV light is irradiated on the channel 1 and the spectroscopic spectrum is measured.
- the bill position is 1 to 2 mm
- UV light is irradiated on the channel 2 and the spectrum is measured, so that the UV light is sequentially irradiated on each channel 1 to 8 of the first light source unit 31a.
- Spectral spectra are measured during the time.
- the sensor unit 34 Based on the spectroscopic measurement condition 81, the sensor unit 34 performs alternating lighting control to turn on and off the light sources of the channels 1 to 8 in order while the banknote position ranges from 0 mm to 8 mm. Data in the first column of the blocks 701 to 708 shown can be acquired. Subsequently, when the banknote position reaches 8 mm, the sensor unit 34 can acquire the data in the second column of the blocks 709 to 716 by sequentially turning on and off the light sources of the channels 1 to 8 again. it can.
- the spectral spectrum from the blocks 701 to 740 including the entire surface of the banknote 100 is obtained. Can be obtained.
- the identification unit 1 can acquire the spectrum from the entire surface of the banknote 100 by preparing in advance the setting for acquiring the spectrum from the blocks 701 to 740 as the spectrum measurement condition 81 in advance. it can.
- FIG. 7 is a diagram illustrating a method of measuring the entire surface of the banknote 100 and acquiring a spectral spectrum from a partial region where light emission is excited on the banknote 100.
- FIG. 7A shows an example of the banknote 100 in which fluorescence is excited in the three partial regions 101 to 103 when UV light is irradiated.
- the partial areas 101 to 103 are included in four blocks set on the banknote 100. Therefore, when the entire banknote is measured as shown in FIG.
- the spectral spectra of the fluorescence emission excited in the partial regions 101 to 103 are acquired.
- FIGS. 7B to 7D show spectral spectra acquired by blocks corresponding to the partial regions 101 to 103, respectively. As shown in FIGS. 7B to 7D, spectral spectra having different characteristics such as peak wavelength, peak level, and signal waveform are acquired in the three partial regions 101 to 103. The characteristics of the acquired spectrum can be used for identification processing such as denomination and authenticity of the banknote 100.
- the identification unit 1 identifies the banknote 100 based on features such as the peak wavelength, peak level, and signal waveform of the spectral spectrum that appear in the spectral spectrum, and identifies the banknote 100 based on the banknote image generated from the spectral spectrum. It is also possible to do.
- the banknote image is generated by the data acquisition unit 73, and the banknote 100 is identified by the identification processing unit 74.
- FIG. 7E is a schematic diagram showing a banknote image 200 of the banknote 100 in FIG. 7A generated based on the spectral spectra shown in FIGS.
- the banknote image 200 is formed of blocks obtained by dividing the entire banknote into 40 blocks in accordance with the blocks 701 to 740 used for acquiring a spectral spectrum.
- the partial areas 191 to 193 corresponding to the partial areas 101 to 103 where the fluorescence emission is excited are schematically shown using different patterns, but in the actual image, each of the areas 191 to 191 is shown.
- Reference numeral 193 denotes a color image having a different color and brightness. Specifically, based on a preset method, an image of each block of the banknote image 200 is generated from the spectrum obtained by each of the blocks 701 to 740 set on the banknote 100.
- the block image is a red image
- the block image Is a green image
- the block image is an image of a color in which red and green are mixed according to the peak ratio.
- the brightness of the image is changed according to the peak level.
- a block in which a characteristic waveform based on a spectrum is not obtained is displayed in a background color.
- the background color is not particularly limited, but in the present embodiment, the background color is displayed as white for convenience of illustration.
- FIG. 191 is formed from four blocks.
- FIG. 7B since a spectral spectrum having a peak in the yellow wavelength region is obtained from the partial region 101 on the banknote 100, the partial region 191 of the banknote image 200 is a yellow image.
- FIG. 7C since a spectral spectrum having a peak in the green wavelength region is obtained from the partial region 102 on the banknote 100, the partial region 192 on the banknote image 200 corresponding to the partial region 102 is obtained. Becomes a green image. Further, as shown in FIG.
- the partial region 193 on the banknote image 200 corresponding to the partial region 103 is obtained. Becomes a blue image.
- the corresponding partial areas 191 to 193 on the banknote image 200 are displayed as color images corresponding to the partial areas 101 to 103 on which the fluorescence emission is excited on the banknote 100, while the entire surface of the banknote 100 is displayed. Blocks for which no luminescence was observed when measuring are displayed with a white background.
- the banknote image 201 the area corresponding to the block on the banknote 100 in which the fluorescence emission is excited is displayed as an image corresponding to the spectrum of the fluorescence emission excited in this block. Since the position of the block where the fluorescence emission is observed, the spectrum obtained by each block, and the like differ depending on the type of the banknote 100, the denomination and authenticity of the banknote 100 can be identified based on the banknote image 200. .
- the banknote image generated based on the spectral spectrum is stored in the storage unit 80 in advance as the identification data 82, so that the stored banknote image and the data acquisition unit 73 are used. Based on the correlation with the banknote image 200 generated from the spectroscopic spectrum, the denomination of the banknote 100 can be determined.
- the identification unit 1 can acquire a spectral spectrum only from a predetermined partial area on the banknote 100 in addition to acquiring a spectral spectrum of the entire banknote 100 as shown in FIG.
- a method for acquiring data relating to optical characteristics from only the partial areas 111 to 113 on the banknote 100 will be described using the banknote 100 shown in FIG. 8 as an example.
- FIG. 8 is a diagram illustrating an example of the banknote 100 in which light emission is observed in the three partial regions 111 to 113.
- FIG. 8A shows three partial areas 111 to 113 in which light emission is observed on the banknote 100
- FIGS. 8B to 10D show the measurement of the light emission of the partial areas 111 to 113.
- FIG. Shows the spectrum obtained. Specifically, in the partial region 111, as shown in FIG. 8B, when IR light is irradiated, a spectral spectrum by reflected light is acquired. Further, in the partial region 112, as shown in FIG. 8C, when UV light is irradiated, a spectrum by fluorescence emission is acquired. Further, in the partial region 113, as shown in FIG.
- a spectroscopic measurement condition 81 is set as shown in FIG.
- FIG. 9 is a diagram for explaining the spectroscopic measurement conditions 81 set for the banknote 100 shown in FIG. 9A shows the positional relationship between the partial areas 111 to 113 on the banknote 100 and the blocks 701 to 740 set on the banknote 100, and FIG. 9B shows the setting contents of the spectroscopic measurement condition 81.
- FIG. 3C shows a timing chart relating to the operations of the first light source unit 31a, the second light source unit 31b, and the sensor unit 34 when acquiring a spectral spectrum based on the spectral measurement condition 81.
- FIG. 9A shows an example in which the settings of blocks 701 to 740 shown in FIG. 6 are used.
- the block setting for acquiring a spectral spectrum is not limited to the example shown in FIG. Absent.
- the partial area 111 is included in four blocks.
- the block can be set so that the partial area 111 is included in three or less blocks, or the partial area 111 includes five partial areas 111. It can also be set to be included in more than one block.
- the bill position of the spectroscopic measurement condition 81 shown in FIG. 9B, the lighting start timing and lighting time of the first light source unit 31a and the second light source unit 31b, and the measurement starting timing and measuring time by the sensor unit 34 are set.
- a block having an arbitrary size can be set at an arbitrary position on the banknote 100, and the spectrum can be measured with this block.
- the block setting shown in FIG. 6 is used. An example of measuring a spectral spectrum will be described.
- the identification unit 1 acquires data only from these partial areas 111 to 113. be able to. Specifically, as shown in FIG. 9A, blocks 705 to 707 corresponding to the partial area 111, blocks 710, 711, 718 and 719 corresponding to the partial area 112, and blocks corresponding to the partial area 113 The spectral spectrum is measured only at 729-731.
- the banknote processing apparatus 2 when only the banknote 100 shown in FIG. 9A is processed by the banknote processing apparatus 2, or the identification processing unit 74 is transporting the conveyance path 60 based on the data obtained by the identification sensor unit 20.
- the denomination of the banknote 100 is identified as the denomination of the banknote 100 shown in FIG. 9A
- the spectroscopic measurement condition 81 shown in FIG. As described above, the process of acquiring the spectrum from only the partial regions 111 to 113 is performed.
- spectral spectrum measurement is completed in block 707 between bill positions 6-7 mm, the light source is not turned on and spectral spectra are not acquired until the bill position reaches 9 mm. And when the banknote position of the banknote 100 reaches 9 mm, the measurement of the spectral spectrum is started again, and as shown in FIGS. The measurement shown in 3 to 6 is performed, and a spectrum is acquired in blocks 710, 711, 718 and 719 corresponding to the partial region 112. Specifically, no.
- the timing when the banknote 100 arrives at the 9 mm banknote position is set to 0 ⁇ S, and the light sources 602 a and 602 b of the channel 2 of the first light source unit 31 a are turned on at a current value of 10 mA for 500 ⁇ S from here. Irradiate.
- the spectral spectrum of the light emitted by the block 710 is acquired by acquiring the spectral spectrum by the sensor unit 34 during this 500 ⁇ S irradiation with UV light.
- UV light is emitted from the first light source unit 31 a and a spectrum is acquired in a block 711.
- the measurement is stopped.
- the measurement is started again, and No.
- the measurements shown in 5 and 6 are performed, and spectral spectra are acquired at blocks 718 and 719.
- no. With the measurement of 3 to 6, the spectrum can be acquired in the blocks 710, 711, 718 and 719 corresponding to the partial region 112.
- no. 7 to 9 correspond to the partial region 113 by irradiating UV light sequentially from the channels 5 to 7 of the first light source 31a and irradiating IR light sequentially from the channels 5 to 7 of the second light source 31b.
- blocks 729 to 731 both the spectrum by the UV light and the spectrum by the IR light are acquired.
- the processing load can be reduced by acquiring the spectral spectrum only from this partial region.
- partial regions 111 to 113 in which light emission is observed on the banknote 100 by measuring the spectrum from only 10 blocks among the 40 blocks 701 to 740 forming the banknote 100.
- Spectral spectra can be acquired for all of the above.
- the spectral spectrum as shown in FIG. 8B is acquired in the blocks 705 to 707 corresponding to the partial region 111, and the blocks 710, 711, 718 and 719 corresponding to the partial region 112 are shown in FIG.
- Such a spectrum is acquired, and in the blocks 729 to 731 corresponding to the partial region 113, a spectrum as shown in FIG.
- FIG. 10 is a schematic diagram showing banknote images 201 and 202 generated based on the spectral spectra acquired from the partial regions 111 to 113. As in the case of FIG. 7, in the actual banknote images 201 and 202, each of the regions 211 to 213 is a color image corresponding to the spectral spectrum. In FIG. 10, these images are schematically shown using patterns. Show.
- FIG. 10A shows a banknote image 201 generated from a spectrum obtained by irradiating UV light
- FIG. 10B shows a banknote image 202 generated from a spectrum obtained by irradiating IR light. Is shown.
- the banknote images 201 and 202 can be separately generated according to the type of light emitted from the light source unit 31.
- a spectral spectrum due to fluorescence emission is acquired in the partial regions 112 and 113, and as shown in FIG.
- the partial areas 212 and 213 corresponding to the 100 partial areas 112 and 113 are images of colors according to the spectral spectrum.
- a spectral spectrum by reflected light is acquired in the partial areas 111 and 113, so that the partial area of the banknote 100 is displayed on the banknote image 202 as shown in FIG.
- the partial areas 211 and 213 corresponding to 112 and 113 are images of colors according to the spectral spectrum.
- the identification unit 1 can acquire a spectrum of phosphorescence emission in addition to fluorescence emission. Below, the method to acquire the data concerning an optical characteristic is demonstrated to the example of the banknote 100 shown in FIG. 11 in which both fluorescence emission and phosphorescence emission are observed.
- FIG. 11 is a diagram illustrating an example of the banknote 100 in which light emission is observed in the four partial areas 121 to 124.
- FIG. 11 (A) shows four partial areas 121 to 124 where light emission is observed on the banknote 100
- FIGS. 11 (B) to (E) show when the light emission of the respective partial areas 121 to 124 is measured. Shows the spectrum obtained.
- the partial region 121 as shown in FIG. 11B, when UV light is irradiated, a spectrum by fluorescence emission is acquired.
- FIG. 11C when UV light is irradiated, a spectral spectrum by fluorescence emission and phosphorescence emission is acquired.
- a spectrum by phosphorescence is acquired in the partial region 123, as shown in FIG. 11D.
- a spectrum by phosphorescence is acquired in the partial region 124, as shown in FIG. 11E.
- UV light when UV light is irradiated, a spectral spectrum by phosphorescence emission is obtained in a wavelength region of 700 nm or less, and when irradiated with IR light, 700 nm or more.
- a spectral spectrum by phosphorescence emission is acquired in the wavelength region of.
- a spectroscopic measurement condition 81 is set as shown in FIG.
- the position and size of the block can be set in accordance with the partial areas 121 to 124 shown in FIG. 11, but in this embodiment, the spectral spectrum is measured using the block setting shown in FIG. An example will be described.
- a spectral spectrum can only be measured directly above a partial region that emits light. For this reason, as shown in FIG. 12A, even when a part of the partial areas 121, 123, and 124 where light emission is excited on the banknote 100 is outside the area of the blocks 710, 720, and 730 to be measured, From each of the blocks 710, 720, and 730, the spectrum of the light emitted in each of the partial regions 121, 123, and 124 can be measured. On the contrary, even when the partial region 122 is included in the block 711 and a partial region in the block 711 becomes the partial region 122, light emission excited from the block 711 in the partial region 122 is obtained. Can be measured.
- FIG. 12 is a diagram for explaining the spectroscopic measurement conditions 81 set for the banknote 100 shown in FIG. 12A shows the positional relationship between the partial areas 121 to 124 on the banknote 100 and the blocks 701 to 740 set on the banknote 100, and FIG. 12B shows the setting contents of the spectroscopic measurement condition 81.
- FIG. 3C shows a timing chart relating to the operations of the first light source unit 31a, the second light source unit 31b, and the sensor unit 34 when acquiring a spectral spectrum based on the spectral measurement condition 81.
- the block 710 corresponding to the partial area 121, the block 711 corresponding to the partial area 122, the block 720 corresponding to the partial area 123, and the partial area 124 are supported.
- the spectral spectrum is measured only at block 730.
- the banknote processing apparatus 2 when only the banknote 100 shown in FIG. 12A is processed by the banknote processing apparatus 2, or the identification processing unit 74 is transporting the transport path 60 based on the data obtained by the identification sensor unit 20.
- the denomination of the banknote 100 is identified as the denomination of the banknote 100 shown in FIG. 12A
- the spectroscopic measurement condition 81 shown in FIG. Thus, the spectral spectrum is measured only in the partial regions 121-124.
- a spectral spectrum is acquired by the sensor unit 34, thereby acquiring a spectral spectrum of light emission excited in the block 710.
- the spectroscopic measurement condition 81 of No. In the measurement shown in 1 and 2, UV light is irradiated from the light sources 603a and 603b of the channel 3 of the first light source unit 31a, and the spectrums of the fluorescence emission and phosphorescence emission excited in the block 711 are acquired.
- the spectral spectrum of fluorescence emission is acquired by simultaneously acquiring the spectral spectrum while irradiating the UV light within 500 ⁇ S at the bill position of 10 to 11 mm.
- the phosphorescence emission spectrum is acquired with a gain of 2 for 500 ⁇ S after the irradiation of UV light is stopped after 500 ⁇ s has elapsed since the bill position reaches 10 mm.
- a phosphorescent emission spectrum is acquired with a gain of 2 for 500 ⁇ S at the banknote position 11 to 12 mm.
- Fluorescence emission is emitted from the moment when light irradiation is started from the light source and disappears at the moment when light irradiation is stopped, whereas phosphorescence continues to emit light after the light irradiation is stopped and gradually disappears. Afterglow is observed. For this reason, a spectral spectrum by fluorescence emission is acquired during irradiation of UV light, and after stopping irradiation of UV light, a spectral spectrum of phosphorescence emission is acquired. The emission intensity of phosphorescence is weaker than the emission intensity of fluorescence. For this reason, no. In the measurement of No. 1, the gain of the sensor unit 34 when measuring the fluorescence emission is set to 1.
- the gain of the sensor unit 34 when measuring phosphorescence emission is set to 2.
- the measurement result of the spectral spectrum can be obtained in a state where the peak level of the spectral spectrum of phosphorescence emission is raised.
- the current values of the light source units 31a and 31b set in the spectroscopic measurement condition 81 are changed as necessary, and the light sources 601 to 608a and 601b to 608b are irradiated. By increasing the amount of light, the amount of phosphorescent light emission can be increased.
- the current value for controlling the amount of light emitted from the light source to excite the light emission, the time for irradiating the light, the gain of the signal obtained by measuring the excited light emission, and the signal measurement time By adjusting at least one of them, a spectrum having an appropriate peak level in both fluorescence emission and phosphorescence emission can be obtained.
- the current value and light emission time when the light source is turned on, and the gain and measurement time when the sensor signal is acquired clearly show features such as peaks on the signal waveform of each spectral spectrum, and the sensor unit 34 receives light.
- the light receiving element is set so as not to be saturated.
- the light source is not turned on and the spectrum is not acquired until the bill position reaches 19 mm. .
- attains a 19 mm banknote position the measurement of a spectral spectrum will be started again.
- the spec. 3 is performed, and a spectrum is acquired at block 720 corresponding to the partial region 123. Specifically, no. In the measurement of 3, the timing when the banknote 100 reaches the banknote position of 19 mm is set to 0 ⁇ S, and the light source 604a, 604b of the channel 4 of the second light source unit 31b is lit at a current value of 10 mA for 500 ⁇ S from here to emit IR light. Irradiate.
- the measurement by the sensor unit 34 is not performed for 500 ⁇ S during irradiation with IR light, and 500 ⁇ S has elapsed after the banknote position has reached 19 mm and irradiation of IR light has been stopped for 500 ⁇ S (banknote position 20 to 21 mm). In the meantime, measurement by the sensor unit 34 is performed with a gain of 2. As a result, the spectrum of phosphorescence emitted by the IR light is obtained in the block 720 corresponding to the partial region 123.
- the light source After acquiring the phosphorescent emission spectrum in block 720, the light source is not turned on and the spectrum is not acquired until the bill position reaches 29 mm. And when the banknote 100 reaches
- the measurement shown in FIG. 4 is performed, and a spectrum is acquired at block 730 corresponding to the partial region 124. Specifically, no.
- the timing when the banknote 100 arrives at the 29 mm banknote position is 0 ⁇ S, and the light sources 606a and 606b of the channel 6 of the first light source unit 31a and the second light source unit 31b are set at a current value of 10 mA for 400 ⁇ S from here. Turns on and emits both UV light and IR light.
- the measurement by the sensor unit 34 is not performed during 400 ⁇ S for irradiating UV light and IR light, and after 400 ⁇ S has elapsed after the banknote position has reached 29 mm, both UV light and IR light irradiation are stopped. Measurement is performed by the sensor unit 34 with a gain of 2 during 500 ⁇ S. That is, assuming that the time when the bill 100 reaches the 29 mm bill position is 0 (zero), only UV light and IR light are irradiated between 0 and 400 ⁇ S, and the spectrum is not acquired, and 400 ⁇ S has elapsed. After the irradiation of UV light and IR light is stopped, phosphorescence emission by UV light and phosphorescence emission by IR light are measured between 400 and 900 ⁇ S.
- the load related to the measurement can be reduced.
- all of the partial areas 121 to 124 where light emission is observed on the banknote 100 are measured by measuring the spectrum with four blocks among the 40 blocks 701 to 740 forming the banknote 100.
- Spectral spectra can be acquired for.
- a spectrum as shown in FIG. 11B is acquired from the fluorescence emission excited by the UV light.
- a spectrum as shown in FIG. 11C is acquired from the fluorescence emission and phosphorescence emission excited by UV light.
- a spectral spectrum as shown in FIG. 11D is acquired from phosphorescence emitted by IR light.
- a spectrum as shown in FIG. 11E is acquired from phosphorescence emitted by UV light and phosphorescence emitted by IR light.
- FIG. 13 is a schematic diagram showing banknote images 203-205 generated based on the spectral spectra acquired from the partial regions 121-124.
- the regions 221 to 224 are color images corresponding to the spectral spectrum. In FIG. 13, these are schematically illustrated using different patterns. Is shown.
- FIG. 13A shows a banknote image 203 generated from a fluorescence emission spectrum obtained by irradiating UV light
- FIG. 13B shows a phosphorescence emission spectrum obtained by irradiating UV light.
- generated from the figure is shown
- the same figure (C) has shown the banknote image 205 produced
- the identification unit 1 can also separately generate the banknote images 203 to 205 according to the type of light emitted from the light source unit 31 and the type of excited light emission.
- the partial areas 221 and 222 on the banknote image 203 are images of colors according to the spectral spectrum.
- a spectral spectrum by phosphorescence emission is acquired in the partial regions 122 and 124, so as shown in FIG. 13B, corresponding to the partial regions 122 and 124 on the banknote 100.
- the partial areas 222 and 224 on the banknote image 204 are images of colors according to the spectral spectrum.
- the partial areas 223 and 224 on the banknote image 205 are images of colors according to the spectral spectrum.
- FIGS. 11 to 13 show a mode in which the spectral spectra of visible fluorescence and visible phosphorescence when irradiated with UV light and IR fluorescence and IR phosphorescence when irradiated with IR light are shown. It is not limited to this. Specifically, for example, it is possible to obtain an optical spectrum of IR fluorescence and IR phosphorescence when irradiated with UV light, and IR fluorescence and IR phosphorescence when irradiated with visible light.
- the wavelength range of the light irradiated on the banknote 100 and the wavelength range of the spectral spectrum acquired from the banknote 100 are appropriately determined according to the light emission phenomenon excited by the banknote 100.
- the identification data 82 for the banknote 100 shown in FIG. 11, a fluorescent banknote image at the time of UV light irradiation, a phosphorescent banknote image at the time of UV light irradiation, and a phosphorescent banknote image at the time of IR light irradiation. If stored in the storage unit 80 in advance, based on the correlation between these images and the banknote images 203 to 205 generated by acquiring the spectral spectrum from the banknote 100 transported through the transport path 60, It becomes possible to determine whether the banknote 100 is the banknote 100 shown in FIG.
- the example in which the light source of the channel through which this region passes immediately below is turned on with respect to the region where light emission is observed.
- the present embodiment is not limited to this, and the light emission is performed.
- the spectroscopic measurement condition 81 can be set so that light is emitted obliquely from above the light emitting region.
- the timing for irradiating light toward the light emitting region, the timing for stopping the irradiation of light, and the timing for measuring phosphorescence can be set to values different from the above-described example.
- the spectral spectrum from the banknote 100 conveyed at 2000 mm / S is acquired in all blocks within a time of 500 ⁇ S, and when measuring fluorescence emission, the light from the light source is measured during this 500 ⁇ S.
- it is set to finish all the irradiation of light from the light source, the stoppage of light irradiation, and the measurement of phosphorescence emission during this 500 ⁇ S. Is also possible.
- phosphorescence measurement for example, in one block of phosphorescence measurement, light is emitted from a light source between 0 and 400 ⁇ S, and phosphorescence is measured between 400 and 500 ⁇ S after irradiation of light from the light source is stopped.
- the spectral spectrum related to phosphorescence emission in 500 ⁇ S in the first block is acquired in 500 ⁇ S.
- one or a plurality of light sources that are lit to excite light emission in each partial region on the banknote 100 can be selected according to the spectroscopic measurement condition 81. Further, in the spectroscopic measurement condition 81, the type (wavelength) of light emitted from the selected light source, the amount of light emitted, the irradiation angle, the light emission, etc. It is also possible to set a start timing and a stop timing, a measurement start timing and a stop timing of light emission excited in each partial region, a gain at the time of measurement, and the like. Thereby, while exciting light emission in the arbitrary partial area
- the identification unit 1 uses features such as the peak wavelength and peak level appearing in the spectral spectrum and the banknote image generated from the spectral spectrum for identifying the banknote 100, and also uses the bill waveform 100 based on the signal waveform of the spectral spectrum. Species etc. can also be identified. Specifically, for example, if the signal waveform of the spectral spectrum obtained on the banknote 100 is stored in the storage unit 80 in advance as the identification data 82 for each denomination of the banknote 100, the identification processing unit 74 It becomes possible to identify the denomination and the like of the banknote 100 based on the correlation between the signal waveform of the spectral spectrum obtained by the data acquisition unit 73 and the signal waveform stored as the identification data 82.
- the processing by the spectroscopic unit 30 can be performed after the processing by the identification sensor unit 20 is finished, or the processing by the identification sensor unit 20 and the processing by the spectroscopic unit 30 can be performed in parallel.
- FIG. 14 is a flowchart showing a case where the processing by the identification sensor unit 20 and the processing by the spectroscopic unit 30 are performed in series.
- the image, magnetic characteristics, thickness, and the like of the banknote 100 are measured by the identification sensor unit 20 (step S11), and the type and authenticity of the banknote 100 are identified based on the measurement result (step S12).
- the spectroscopic measurement condition 81 corresponding to the banknote 100 is read from the storage unit 80 (step S13).
- the spectroscopic unit 30 measures the spectroscopic spectrum (step S14).
- step S15 When the measurement result of the spectral spectrum is obtained, the authenticity of the banknote 100 is identified by comparing with the identification data 82 stored in the storage unit 80 (step S15). In this way, when the type and the authentic identification result of the banknote 100 using the identification sensor unit 20 and the authentic authentication result of the banknote 100 using the spectroscopic unit 30 are obtained, the type of the banknote 100 is based on these. And true / false is finally determined (step S16).
- FIG. 15 is a flowchart showing a case where the processing by the identification sensor unit 20 and the processing by the spectroscopic unit 30 are performed in parallel.
- the image, magnetic characteristics, thickness and the like of the banknote 100 are measured by the identification sensor unit 20 (step S21), and the type and authenticity of the banknote 100 are identified based on the measurement result (step S23).
- the spectroscopic unit 30 measures the spectral spectrum (step S22), and the type and authenticity of the banknote 100 are identified based on the measurement result (step S24).
- the spectroscopic unit 30 when performing the measurement by the spectroscopic unit 30 in a state where the type of the banknote 100 is unknown, measurement of a spectral spectrum necessary for distinguishing all types of the banknote 100 from each other is performed.
- the banknote 100 processed by the banknote processing apparatus 2 is from a predetermined issuing country, each partial region on the banknote 100 that needs to be measured to identify the type of the banknote 100 of the issuing country,
- the light source corresponding to the partial region, the wavelength of light emitted from the light source, the timing and time of light irradiation, the timing and time of measuring the spectral spectrum, and the like are stored in the storage unit 80 in advance as the spectral measurement condition 81.
- a predetermined spectroscopic spectrum can be acquired from a predetermined partial region according to the type of the banknote 100. For example, for each type of banknote 100, information such as a spectral spectrum to be obtained and a partial region from which the spectral spectrum is obtained is prepared in advance as identification data 82, whereby the identification data 82 and the conveyance path 60 are conveyed. The type and authenticity of the banknote 100 can be identified based on the spectral spectrum obtained from the banknote 100 to be processed.
- a banknote image obtained from the spectral spectrum is prepared in advance as identification data 82, whereby the identification data 82 and the spectral spectrum of the banknote 100 transported through the transport path 60 are obtained.
- the type and authenticity of the banknote 100 can be identified based on the obtained banknote image.
- the banknote 100 is based on these.
- Type and true / false are determined (step S25).
- the identification unit 1 can determine the correctness of the banknote 100 based on the waveform of the spectral spectrum in the predetermined wavelength range.
- the kind of light to irradiate is not limited to ultraviolet light and infrared light.
- the light source unit 31 may irradiate only one type of light.
- the light emitted from the light source unit 31 may use three or more types of light such as white light and visible light having a predetermined wavelength.
- the number of light receiving surfaces arranged in the reading unit 32 is not limited to 16, and the number of channels is not limited to 8 channels.
- the number of light receiving surfaces, the number of channels, the number of light sources, the type of light emitted from the light sources, etc. are appropriately determined according to the light emission phenomenon observed on the banknote 100 to be identified and the position and size of the partial region where light emission is excited. It is to be decided.
- No. in FIG. 1 shows a mode in which the measurement by the sensor unit 34 is performed in a plurality of times. Similarly, it is set so that light irradiation from the light sources 601a to 608a and 601b to 608b is performed in a plurality of times. You can also. Specifically, for example, when fluorescence emission and phosphorescence emission are excited by light emitted from the same light source, the phosphor light emission is excited after turning on the light source with a current value set to excite the fluorescence emission. For this reason, the same light source may be turned on with the current value set for this purpose.
- the spectroscopic measurement condition 81 the timing, time, and number of times of irradiating light from the light source and the timing, time, and number of times of measuring the excited light are measured. It can be set according to the light emission.
- the present embodiment only one light source corresponding to one block is turned on in one measurement, and a spectrum is acquired with this block.
- the present embodiment is limited to this. is not.
- a mode in which light sources of a plurality of channels are turned on at the same time and a spectrum is simultaneously acquired from a block corresponding to each channel may be used. For example, when spectral spectra in different wavelength ranges are obtained in the block 701 and the block 705 shown in FIG. 6A, the light sources 601 a and 601 b of the channel 1 corresponding to the block 701 and the channel 5 corresponding to the block 705 are obtained.
- the light sources 605a and 605b of the first and second light sources 605a and 605b can be turned on at the same time, and spectral spectra can be acquired simultaneously from the block 701 and the block 705.
- a block is set according to each partial region.
- the spectroscopic measurement conditions 81 may be set so that the light sources corresponding to the respective blocks are turned on simultaneously and the spectroscopic spectrum is measured simultaneously.
- the extinction and controlling the timing at which the sensor unit 34 acquires the spectral spectrum it is possible to acquire the spectral spectra of the fluorescence emission and the phosphorescence emission.
- the kind, authenticity, correctness, etc. of the banknote 100 can be identified using the banknote image produced
- the paper sheet identification apparatus and the paper sheet identification method according to the present invention identify paper sheets based on data relating to optical characteristics efficiently acquired from a plurality of regions on the paper sheets. It is a useful technique.
- Identification unit paper sheet identification device
- Bill processing device 10
- Deposit port 20
- Identification sensor unit 30
- Spectroscopic unit 31, 31a, 31b
- Light source unit 32
- Reading unit 33
- Light guide unit 34
- Sensor unit 40
- Storage unit 50
- Reject port 60
- Transport path 61
- Upper guide 62
- Lower guide 70
- Control Unit 71
- transport information acquisition unit 72
- light source control unit 73
- data acquisition unit 74
- identification processing unit 80 storage unit
- spectroscopic measurement condition 82
- identification data 90 display unit 311 transparent member 312 base 322 base 401 to 404 light guide plates 501 to 516 light receiving surface 601a 608a, 601b to 608b
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- Spectroscopy & Molecular Physics (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- Immunology (AREA)
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- Investigating, Analyzing Materials By Fluorescence Or Luminescence (AREA)
Abstract
Description
2 紙幣処理装置
10 入金口
20 識別用センサ部
30 分光部
31、31a、31b 光源部
32 読取部
33 光ガイド部
34 センサ部
40 収納部
50 リジェクト口
60 搬送路
61 上側ガイド
62 下側ガイド
70 制御部
71 搬送情報取得部
72 光源制御部
73 データ取得部
74 識別処理部
80 記憶部
81 分光測定条件
82 識別用データ
90 表示部
311 透明部材
312 ケース
322 ベース
401~404 導光板
501~516 受光面
601a~608a、601b~608b 光源
Claims (9)
- 搬送路を搬送される紙葉類に光を照射して紙葉類から取得した分光スペクトルを利用して該紙葉類を識別する紙葉類識別装置であって、
前記紙葉類上の複数の部分領域に対応して配置された複数の光源を含む光源部と、
前記複数の部分領域から光を受光可能に配置された受光面を有する読取部と、
前記受光面で受けた光から分光スペクトルを取得するセンサ部と、
前記紙葉類上の所定の部分領域から分光スペクトルを取得するために、前記光源部に含まれる複数の光源のうち前記部分領域に対応する少なくとも1つの光源を特定する情報、前記少なくとも1つの光源を点灯するタイミングを特定する情報、及び前記タイミングで点灯した光源を消灯するタイミングを特定する情報を関連付けた分光測定条件を保存する記憶部と、
前記分光測定条件に基づいて前記光源部を制御する光源制御部と
を備えることを特徴とする紙葉類識別装置。 - 前記分光測定条件では、さらに、前記少なくとも1つの光源を点灯する際の発光量を特定する情報が関連付けて保存されていることを特徴とする請求項1に記載の紙葉類識別装置。
- 前記分光測定条件では、さらに、前記センサ部により分光スペクトルの取得を開始するタイミングを特定する情報及び前記分光スペクトルの取得を停止するタイミングを特定する情報が関連付けて保存されていることを特徴とする請求項1又は2に記載の紙葉類識別装置。
- 前記分光測定条件では、さらに、前記センサ部により分光スペクトルを取得する際の信号ゲインの調整量を特定する情報が関連付けて保存されていることを特徴とする請求項1~3のいずれか1項に記載の紙葉類識別装置。
- 前記記憶部では、紙葉類の種類及び方向毎に、前記分光測定条件が保存されており、
前記光源制御部は、前記搬送路を搬送される紙葉類の種類及び方向に対応する分光測定条件を前記記憶部から読み出して前記光源部を制御する
ことを特徴とする請求項1~4のいずれか1項に記載の紙葉類識別装置。 - 前記光源部は波長域の異なる少なくとも2種類の光を照射可能であり、
前記分光測定条件で光源を特定する情報は光の種類を特定する情報を含む
ことを特徴とする請求項1~5のいずれか1項に記載の紙葉類識別装置。 - 前記光源部は、前記受光面によって光を受光する前記紙葉類上の受光領域に対して搬送方向の上流側から光を照射する光源と、該光を前記受光領域に対して前記搬送方向の下流側から照射する光源とを含むことを特徴とする請求項1~6のいずれか1項に記載の紙葉類識別装置。
- 前記センサ部によって取得した分光スペクトルに基づいて該分光スペクトルを取得した部分領域を画像で表すことにより前記紙葉類の光学特性を示す紙葉類画像を生成することを特徴とする請求項1~7のいずれか1項に記載の紙葉類識別装置。
- 搬送路を搬送される紙葉類から取得した分光スペクトルを利用して該紙葉類を識別する紙葉類識別方法であって、
複数の光源を含む光源部で分光スペクトルを取得する部分領域に対応する少なくとも1つの光源を特定する情報、前記少なくとも1つの光源を点灯するタイミングを特定する情報、及び前記タイミングで点灯した光源を消灯するタイミングを特定する情報を関連付けた分光測定条件を取得する分光測定条件取得工程と、
取得した前記分光測定条件に基づいて前記光源部を制御する光源制御工程と、
読取部の受光面により前記紙葉類上の複数の部分領域から光を受光する受光工程と、
センサ部により前記受光面で受光した光から分光スペクトルを取得する分光スペクトル取得工程と
を含んだことを特徴とする紙葉類識別方法。
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