WO2010026646A1 - Paper sheet discriminating device, paper sheet discriminating method, and paper sheet discriminating program - Google Patents

Paper sheet discriminating device, paper sheet discriminating method, and paper sheet discriminating program Download PDF

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Publication number
WO2010026646A1
WO2010026646A1 PCT/JP2008/066088 JP2008066088W WO2010026646A1 WO 2010026646 A1 WO2010026646 A1 WO 2010026646A1 JP 2008066088 W JP2008066088 W JP 2008066088W WO 2010026646 A1 WO2010026646 A1 WO 2010026646A1
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WO
WIPO (PCT)
Prior art keywords
paper sheet
reflection surface
image
surface image
image acquisition
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Application number
PCT/JP2008/066088
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French (fr)
Japanese (ja)
Inventor
貴 傅
尚司 冨谷
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グローリー株式会社
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Publication date
Application filed by グローリー株式会社 filed Critical グローリー株式会社
Priority to PCT/JP2008/066088 priority Critical patent/WO2010026646A1/en
Publication of WO2010026646A1 publication Critical patent/WO2010026646A1/en

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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

Definitions

  • the present invention relates to a paper sheet identification device that acquires image information of paper sheets such as banknotes, checks, bills, gift certificates, and the like, and identifies paper sheets from the image information. Among them, by identifying one side individually, for example, a paper sheet identification device, a paper sheet identification method, and a paper sheet identification capable of performing paper sheet contamination determination and paper sheet type specification with high accuracy Regarding the program.
  • paper sheets such as banknotes, checks, bills, gift certificates, etc. are irradiated with light, and the image information obtained by transmitting through the paper sheets is used to determine whether the paper sheets are dirty or not. It is known that there is a paper sheet identification device for specifying the type of the paper.
  • one side of the reference image information prepared in advance from the transmission image information on the front and back of the paper sheet obtained by irradiating one side of the paper sheet and transmitting through the paper sheet To obtain image information on one side irradiated with light and identify paper sheets based on the image information on one side, but for the other one side, Since it is not possible to acquire the image information of the kind, there is a problem that the paper sheet cannot be identified based on the image information on the other side.
  • the banknote table 601 when the banknote table 601 has a stain 602 and the banknote back 603 also has a stain 604, the banknote table 601 is irradiated with light.
  • a difference image 609 is obtained by multiplying the reference image 607 of the back 603 prepared in advance in the storage unit 606 by the correction coefficient ⁇ and subtracting the difference image 609 from the obtained transmission image 605, and from the obtained difference image 609.
  • the banknotes were identified for the presence or absence of banknotes.
  • the stain judgment for judging the bill as a stain ticket is performed for both sides of the bill.
  • the difference image 609 also includes a stain 604 on the back 603 of the banknote, even though the banknote table 601 has only one stain 602. Will end up.
  • the conventional paper sheet identification device for example, when a banknote is inserted in a state where the front of the banknote is used as a light irradiation surface, light is applied to the front of the banknote and a transmission image viewed from the front of the banknote is acquired. And the difference image in which the characteristic of the table
  • the conventional paper sheet identification device for example, when a banknote is inserted in a state where the back side of the banknote is used as a light irradiation surface, the back side of the banknote is irradiated with light, and the transmission seen from the back side of the banknote An image is acquired, and a difference image including the features on the back of the banknote is acquired.
  • the present invention has been made to solve the above-described problems, and is a paper sheet identification device, a paper sheet identification method, and a paper sheet that can individually identify one of both sides of a paper sheet.
  • the purpose is to provide an identification program.
  • the present invention provides a paper sheet identification device, a paper sheet identification method, and a paper sheet identification program capable of realizing highly accurate contamination determination by individually identifying the front and back contamination of a paper sheet.
  • the purpose is to do.
  • the present invention provides a paper sheet that can realize a highly accurate specification of a paper sheet type in a short time while significantly reducing the parts cost even in the case of a paper sheet whose characteristics only appear on one side.
  • An object is to provide an identification device, a paper sheet identification method, and a paper sheet identification program.
  • a paper sheet identification apparatus includes transmission image acquisition means for acquiring a transmission image through a paper sheet, and a reflection surface image of one side of the paper sheet.
  • transmitted light irradiating means for irradiating the paper sheet with transmitted light that passes through the paper sheet, and reflection for irradiating light on one side of the paper sheet.
  • a light irradiating means; and a light receiving means for receiving the transmitted light irradiated by the transmitted light irradiating means and receiving reflected light of the light irradiated by the reflected light irradiating means, and the transmitted image acquiring means Receives the transmitted light by the light receiving means to acquire a transmission image of the paper sheet, and the reflection surface image acquisition means receives the reflected light by the light receiving means and receives the reflected light of the paper sheet. A reflection surface image is acquired.
  • the paper sheet identifying apparatus further includes a correction coefficient setting unit that sets a correction coefficient of the difference image acquisition unit so that the reflection surface image can be accurately differentiated from the transmission image. It is characterized by.
  • the correction coefficient setting is based on the transmission image acquired by the transmission image acquisition unit and the reflection surface image acquired by the reflection surface image acquisition unit.
  • correction coefficient setting changing means for changing the correction coefficient set by the means.
  • the paper sheet identification means determines whether or not the type of the paper sheet has been specified based on the transmission image and / or the reflection surface image.
  • a paper sheet type specifying unit that determines the type of the paper sheet based on the difference image when the paper sheet type cannot be specified based on the transmission image and / or the reflection surface image. It is characterized by having.
  • the paper sheet identification means includes authenticity determination means for determining the authenticity of the paper sheet based on the transmission image and the reflection surface image. It is characterized by having.
  • the paper sheet identification means determines the presence or absence of fouling on one side of the paper sheet based on the reflection surface image, and the difference image. Based on the above, the present invention is characterized in that there is a contamination determination means for determining whether the other side of the paper sheet is stained.
  • the stain determination means specifies the one side as the front or back of the paper sheet based on the reflection surface image, and the specification result Based on the front and back specifying means for specifying the other side as the back or front of the paper sheet, and determining whether or not the front side of the paper sheet specified by the front and back specifying means is soiled, It has a front and back fouling judgment means for judging the presence or absence of fouling on the back side.
  • a transmission image acquisition step of acquiring a transmission image through the paper sheet, and a reflection surface image acquisition for acquiring a reflection surface image of one side of the paper sheet A difference image that obtains a difference image obtained by subtracting the reflection surface image of one side of the paper sheet acquired in the reflection surface image acquisition step from the transmission image of the paper sheet acquired in the step and the transmission image acquisition step An acquisition step; and a paper sheet identification step for identifying the paper sheet based on the transmission image, the reflection surface image, and the difference image of the paper sheet.
  • a transmission image acquisition procedure for acquiring a transmission image through the paper sheet and a reflection surface image acquisition for acquiring a reflection surface image of one side of the paper sheet.
  • a difference image that obtains a difference image obtained by subtracting a reflection surface image of one side of the paper sheet acquired by the reflection surface image acquisition procedure from the transmission image of the paper sheet acquired by the procedure and the transmission image acquisition procedure
  • a computer is caused to execute a program including an acquisition procedure and a paper sheet identification procedure for identifying the paper sheet based on the transmission image, the reflection surface image, and the difference image of the paper sheet.
  • the transmission image acquisition means for acquiring the transmission image through the paper sheet
  • the reflection surface image acquisition means for acquiring the reflection surface image of one side of the paper sheet
  • the transmission image acquisition Difference image acquisition means for acquiring a difference image obtained by subtracting the reflection surface image of one side of the paper sheet acquired by the reflection surface image acquisition means from the transmission image of the paper sheet acquired by means
  • the paper sheet Paper sheet identifying means for identifying the paper sheet based on the transmission image, the reflection surface image, and the difference image of the paper sheet.
  • transmitted light irradiating means for irradiating the paper with transmitted light that transmits the paper
  • reflected light irradiating means for irradiating light on one side of the paper
  • a light receiving means for receiving the transmitted light irradiated by the transmitted light irradiating means and receiving reflected light of the light irradiated by the reflected light irradiating means
  • the transmitted image acquiring means is the light receiving means.
  • the light receiving means for receiving two kinds of transmitted light and reflected light can be combined into one, without adding an expensive light receiving means, The cost of parts can be reduced.
  • correction coefficient setting means for setting a correction coefficient of the difference image acquisition means so that the reflection surface image can be accurately differentiated from the transmission image.
  • one side of the paper sheets can be identified.
  • the correction coefficient setting unit sets the transmission image acquired by the transmission image acquisition unit and the reflection surface image acquired by the reflection surface image acquisition unit. Since it has a correction coefficient setting changing means for enabling the correction coefficient to be changed, in addition to the effect of the above-mentioned claim 3, while correcting the product error, one side of the paper sheet is accurately set. Can be identified.
  • the paper sheet identifying means determines whether or not the type of the paper sheet has been specified based on the transmission image and / or the reflection surface image, and the transmission
  • the paper sheet type specifying means for specifying the paper sheet type based on the difference image is provided. Therefore, in addition to the effect described in claim 1 or 2, even in the case of paper sheets whose features appear only on one side, the high-precision paper sheets in a short time while reducing the component cost The type can be specified.
  • the paper sheet identifying means includes authenticity determination means for determining the authenticity of the paper sheet based on the transmission image and the reflection surface image. Therefore, in addition to the effect of the first or second aspect, it is possible to realize a highly accurate determination of the authenticity of the paper sheet while reducing the component cost.
  • the paper sheet identifying means determines the presence or absence of contamination on one side of the paper sheet based on the reflection surface image, and based on the difference image, the paper sheet
  • one side of each sheet is individually identified.
  • the stain determination means specifies the one side as the front or back of the paper sheet based on the reflection surface image, and based on the specification result, the other side Front / back specifying means for specifying one side as the back or front of the paper sheet, and determining whether the front side of the paper sheet specified by the front / back specifying means is fouled, and whether the back side of the paper sheet is fouled
  • the front and back stains of the paper sheet are individually identified for stains with high accuracy. Can be realized.
  • a transmission image acquisition procedure for acquiring a transmission image by transmitting paper sheets
  • a reflection surface image acquisition procedure for acquiring a reflection surface image of one side of the paper sheets
  • the transmission A difference image acquisition procedure for acquiring a difference image obtained by subtracting the reflection surface image of the one side of the paper sheet acquired by the reflection surface image acquisition procedure from the transmission image of the paper sheet acquired by the image acquisition procedure;
  • a computer to execute a program including a paper sheet identification procedure for identifying the paper sheet based on the transmission image, the reflection surface image, and the difference image of the paper sheet.
  • FIG. 1 is a block diagram showing a schematic configuration inside the banknote recognition apparatus of the present embodiment.
  • FIG. 2 is an explanatory view briefly showing the arrangement configuration of sensors on the conveyance path inside the banknote recognition apparatus.
  • FIG. 3 is an explanatory diagram simply showing four types of reference patterns of banknotes.
  • FIG. 4 is an explanatory diagram that briefly shows the relationship between banknote fouling and transmittance.
  • FIG. 5 is a flowchart showing the processing operation inside the control unit related to the bill recognition process of the bill recognition device.
  • FIG. 6 is an explanatory view briefly showing an outline of the operation of the banknote recognition apparatus.
  • FIG. 7 is an explanatory view briefly showing an outline of the operation of the conventional paper sheet identification apparatus.
  • the banknote identification apparatus transmits a banknote and acquires a transmission image, acquires a reflection surface image on one side of both sides of the banknote, and further acquires a difference image obtained by subtracting the reflection surface image from the transmission image.
  • a banknote based on the acquired transmission image, reflection surface image, and difference image, one side of both banknotes can be individually identified. As a result, it is possible to realize banknote stain determination, banknote type identification, and banknote authenticity determination with high accuracy.
  • FIG. 1 is a block diagram showing a schematic configuration inside the banknote recognition apparatus of the present embodiment.
  • a banknote identification device 1 shown in FIG. 1 includes a banknote transport identification mechanism 2 including various sensors on a transport path for transporting banknotes, a storage unit 3 that stores various information such as image information, and various buttons such as an operation start button. , A display unit 5 that displays various information such as identification results, and a control unit 6 that controls the entire bill recognition device 1.
  • the banknote transport identification mechanism 2 includes a timing sensor 11 that detects the passage timing of banknotes on the transport path, a line sensor 12 that detects a banknote image with respect to banknotes on the transport path, a roller and a motor that transport banknotes on the transport path, and the like.
  • the mechanical mechanism 13 is provided.
  • FIG. 2 is an explanatory view briefly showing the arrangement configuration of sensors on the conveyance path inside the banknote recognition apparatus 1, wherein (A) is a plan view of the conveyance path and (B) is a side view of the conveyance path.
  • a total of four timing sensors 11 described above are arranged at the entrance and exit on the conveyance path shown in FIG. 2, and a line sensor 12 is arranged at the center of the conveyance path.
  • the timing sensor 11 includes a light emitting element 11a that irradiates light on the conveyance surface on the conveyance path and a light receiving element 11b that receives light from the light emitting element 11a. The bill passage timing is detected.
  • the line sensor 12 includes a transmission light emitting element 12a that irradiates transmitted light on one of the upper and lower sides of the conveyance surface on the conveyance path, and a light receiving element 12c that receives the transmitted light on the opposite side. A transmitted image of a banknote is detected based on the received transmitted light.
  • the light-emitting element 12a for transmission is arranged on the upper side of the transport path.
  • the line sensor 12 includes a reflection light emitting element 12b that irradiates reflected light in the same direction in the vertical direction of the transport surface on the transport path, and a light receiving element 12c that receives the reflected light.
  • the reflection surface image of a banknote is detected based on the reflected light.
  • the reflective light emitting element 12b is arranged below the conveyance path.
  • the banknote thrown into the insertion port which is not shown of the banknote identification device 1 may insert each banknote with either the front or back side facing up to the insertion port, and furthermore, it prints on each banknote. It may be inserted in either the direction most suitable for human recognition of the character string or the pattern that is displayed (hereinafter simply referred to as a specific direction) or the opposite direction. You will pass one by one.
  • the bill conveyance identification mechanism 2 on the conveyance path irradiates light on the front of the banknote on the conveyance path from the light emitting element 11a and the transmission light emitting element 12a when the banknote is turned upward with respect to the insertion slot.
  • the light is emitted from the light emitting element 11a and the light emitting element 12a for transmission onto the back side of the bill on the conveyance path.
  • FIG. 2 shows an example in which the banknote table is inserted upward with respect to the insertion slot.
  • the banknote identification device 1 includes a reference pattern 401 facing upward and in a specific direction, a reference pattern 402 facing back and in a specific direction, a reference pattern 403 facing forward and in a direction opposite to the specific direction, and There are four types of reference pattern images of reference patterns 404 in the direction opposite to the specific direction.
  • the storage unit 3 stores in advance a reference transmission image and a reference reflection surface image of four types of reference patterns as shown in FIG. Similarly, the reference difference images of four types of reference patterns are stored in advance in the storage unit 3 for each denomination of banknotes.
  • control unit 6 shown in FIG. 1 acquires a reflection surface image based on the transmission image acquisition unit 21 that acquires a transmission image based on the transmission light received by the light reception element 12c and the reflection light received by the light reception element 12c.
  • a difference image acquisition unit 23 that acquires a difference image obtained by subtracting the reflection surface image from the transmission image.
  • the transmission image acquisition unit 21 acquires a transmission image transmitted through the front and back of the banknote based on the transmitted light received by the light receiving element 12c.
  • the reflection surface image acquisition part 22 acquires the reflection surface image of the front or back of a banknote based on the reflected light received with the light receiving element 12c.
  • the difference image acquisition part 23 acquires the difference image in which the characteristic of a banknote surface is contained by subtracting the reflective surface image which multiplied the correction coefficient (alpha) mentioned later from a transmission image.
  • the difference image is image information including features of the difference image plane. Even in the case of a visible sensor, the obtained image does not necessarily match the visible image of a banknote.
  • control part 6 shown in FIG. 1 has the mechanical mechanism control part 24 which controls the mechanical mechanism 13, the denomination determination part 25 which determines the denomination of a banknote, and the authenticity determination part 26 which determines the authenticity of a banknote.
  • a fouling determination unit 27 that determines the fouling of banknotes, a correction coefficient calculation unit 28 that calculates a correction coefficient ⁇ for correcting image information, a correction coefficient setting unit 29 that sets the correction coefficient ⁇ , and a calculated correction coefficient ⁇ .
  • a correction coefficient memory 30 for holding.
  • the mechanical mechanism control unit 24 starts driving the mechanical mechanism 13 when detecting the button operation of the operation start button of the operation unit 4, and stops driving the mechanical mechanism 13 when detecting the button operation of the operation stop button. is there.
  • the mechanical mechanism control unit 24 stops driving of the mechanical mechanism 13 when, for example, a paper jam is detected on the conveyance path while the mechanical mechanism 13 is being driven.
  • the denomination determining unit 25 compares and compares the reflection surface image acquired by the reflection surface image acquisition unit 22 with the reference reflection surface image stored in the storage unit 3, and stores it in the storage unit 3 together with the matched reference reflection surface image. The denomination is determined based on the denomination information stored.
  • the denomination determining unit 25 compares and compares the difference image acquired by the difference image acquiring unit 23 with the reference difference image stored in the storage unit 3 and is stored in the storage unit 3 together with the matched reference difference image. The denomination is determined based on the denomination information.
  • the authenticity determination unit 26 determines whether the banknote is a genuine note based on the transmission image acquired by the transmission image acquisition unit 21 and the reflection surface image acquired by the reflection surface image acquisition unit 22.
  • the stain determination unit 27 includes a front / back identification unit 27a that identifies the front and back of a banknote, a front / back stain determination unit 27b that determines the front / back stain of a banknote, and a stain ratio threshold memory that stores a stain ratio threshold value used when determining the stain. 27c.
  • the front / back identification unit 27a compares and collates the reflection surface image acquired by the reflection surface image acquisition unit 22 with the reference reflection surface image of each denomination stored in the storage unit 3, and for example, the reflection surface image is the front reference.
  • the reflection surface image matches the reflection surface image, the reflection surface image is specified as “front”, and when the reflection surface image matches the back reference reflection surface image, the reflection surface image is specified as “back”.
  • the front / back surface contamination determination unit 27b detects contamination included in the reflection surface image by comparing and collating the reflection surface image with the reference reflection surface image stored in the storage unit 3. Moreover, the front and back stain
  • the front / back surface contamination determination unit 27b compares the contamination rate included in the reflection surface image with the contamination rate threshold value stored in advance in the contamination rate threshold memory 27c, and based on the comparison result, the reflection surface image side. It is for judging the contamination.
  • the front / back stain determination unit 27b determines that the banknote is a stain ticket when the stain ratio of the banknote exceeds the stain ratio threshold value. On the other hand, if the stain ratio of the banknote does not exceed the stain ratio threshold value, the banknote is Judged as a genuine ticket.
  • the difference image acquisition unit 23 acquires a difference image through the correction coefficient setting unit 29 by subtracting the reflection surface image multiplied by the correction coefficient ⁇ stored in the correction coefficient memory 30 from the transmission image.
  • the correction coefficient ⁇ corresponds to a correction coefficient for subtracting a substantially complete reflection surface image from the transmission image.
  • the correction coefficient calculation unit 28 uses the correction coefficient ⁇ to correct the reflection surface image.
  • the correction coefficient ⁇ is used to correct variations in the transmission light-emitting element 12a and the reflection light-emitting element 12b and transmit the correction coefficient ⁇ . It calculates according to the detection value of a rate, a reflectance, and the stain of a banknote.
  • FIG. 4 is an explanatory view briefly showing the relationship between the bill defacement and the transmittance.
  • the horizontal line is a cross-sectional view of a banknote, and among the arrows in the vertical direction, the upper half indicates the light emitted from the transmissive light emitting element 12a, and the lower half Indicates transmitted light.
  • the transmittance of the light irradiated from the light emitting element 12a for transmission fluctuates due to differences in the thickness of the banknote, the state of ink on the front and back, paper quality, and the like. To do.
  • the transmittance and the amount of transmitted light are lower compared to the state 501 where the front and back sides are not stained.
  • the transmittance and the amount of transmitted light are further reduced.
  • the transmittance and the amount of transmitted light are higher than those in the four states 501 to 504 described above.
  • the reflectance and the amount of reflected light emitted from the light emitting element 12b for reflection also vary depending on differences in stains and ink states on each banknote surface. For example, when white paper or fluorescent stains are present on the banknote, the reflectance of the reflected light that reflects the contaminated portion increases. Thus, it turns out that a transmittance
  • the correction coefficient calculation unit 28 acquires, from the transmissive light emitting element 12a, a transmittance that varies according to the banknote state such as the banknote thickness, the front and back ink states, and the paper quality. At the same time, the reflectance that fluctuates according to the state of the bill is obtained from the reflective light emitting element 12b, and further, the stain judgment unit 27 detects the stain of the bill, and based on these transmittance, reflectance, and stain detection value, The correction coefficient ⁇ for correcting the reflection surface image is calculated.
  • the correction coefficient calculation unit 28 calculates a correction coefficient ⁇ for each pixel unit in the transmission image, the reflection surface image, and the difference image, and corrects the reflection surface image by multiplying the reflection surface image by the correction coefficient ⁇ , thereby achieving higher accuracy. This makes it possible to acquire a difference image.
  • the correction coefficient setting unit 29 acquires the correction coefficient ⁇ calculated by the correction coefficient calculation unit 28.
  • the correction coefficient setting unit 29 cannot specify the reference reflection surface image when the front and back identification unit 27a cannot identify the front and back of the reflection surface image. It cannot be detected. Therefore, the correction coefficient setting unit 29 sets the correction coefficient stored in advance in the storage unit 3 in the difference image acquisition unit 23 as the correction coefficient ⁇ .
  • the correction coefficient memory 30 is composed of, for example, a non-volatile information storage member such as a flash memory, and the correction coefficient setting unit 29 adds each of the correction coefficient memory 30 necessary for processing performed by the difference image acquisition unit 23.
  • the correction coefficient ⁇ corresponding to the pixel is temporarily stored.
  • the paper sheet identification device is the banknote identification device 1
  • the transmission image acquisition unit is the transmission image acquisition unit 21
  • the reflection surface image acquisition unit is the reflection surface image acquisition unit 22
  • the difference image acquisition unit is the difference image acquisition.
  • the unit 23 and the paper sheet identification means correspond to the control unit 6.
  • the transmitted light irradiating means described in the claims of the present application is the transmitting light emitting element 12a
  • the reflected light irradiating means is the reflecting light emitting element 12b
  • the light receiving means is the light receiving element 12c
  • the correction coefficient setting means is the correction coefficient setting unit 29, and the correction coefficient setting.
  • the changing means corresponds to the correction coefficient calculation unit 28.
  • the paper sheet type specifying means described in the claims of this application is the denomination determining unit 25
  • the authenticity determining means is the authenticity determining unit 26
  • the front / back specifying means is the front / back specifying unit 27a
  • the front / back fouling determining unit is the front / back fouling determining unit 27b. It is equivalent to.
  • FIG. 5 is a flowchart showing the processing operation inside the control unit 6 related to the banknote recognition process of the banknote recognition apparatus 1.
  • FIG. 6 is an explanatory view briefly showing an operation outline of the banknote recognition apparatus 1.
  • the transmission image acquisition unit 21 in the control unit 6 acquires a transmission image 305 based on the transmitted light received by the light receiving element 12c (step S101).
  • the transmission image acquisition unit 21 acquires the transmission image 305 assuming a banknote having a stain 302 on the front side 301 and a stain 304 on the back 303 as shown in FIG.
  • the reflection surface image acquisition unit 22 acquires the reflection surface image 306 based on the reflected light received by the light receiving element 12c (step S102). In this case, the reflection surface image acquisition unit 22 acquires the reflection surface image 306 including the stain 304 on the back of the banknote as shown in FIG.
  • the front / back specifying unit 27a in the stain determination unit 27 in the control unit 6 determines whether or not the reflection surface image is the back side (step S103).
  • the front / back specifying unit 27a compares and collates the reflection surface image with the reference reflection surface image stored in the storage unit 3. For example, when the reflection surface image matches the reference reflection surface image of the front, the reflection surface image Is identified as a table. When the reflective surface image matches the reference reflective surface image on the back side, the reflective surface image is identified as the back side.
  • step S103 When the reflective surface image acquired in step S102 specifies “back” (step S103: Yes), the denomination determining unit 25 determines the denomination based on the back reference reflective surface image matched in step S103 (Ste S104). The denomination determining unit 25 specifies the denomination based on the denomination information stored in the storage unit 3 together with the back reference reflection surface image matched in step S103.
  • the authenticity determination unit 26 determines whether the banknote is a genuine note based on the transmission image acquired in step S101, the reflection surface image acquired in step S102, and the denomination determined in step S104 (step S105). .
  • the front / back fouling determination unit 27b inside the fouling determination unit 27 calculates the difference between the reflection surface image acquired in step S102 and the back reference reflection surface image matched in step S103, thereby acquiring the reflection surface acquired in step S102. Image fouling is detected (step S106). Note that the front / back stain determination unit 27b detects the stain 304 from the reflection surface image 306 as shown in FIG.
  • the correction coefficient calculation unit 28 corrects the reflection surface image acquired in step S102 based on the transmittance and reflectance received by the light receiving element 12c and the detected value of banknote stain detected by the front / back stain determination unit 27b.
  • the correction coefficient ⁇ for this is calculated for each pixel (step S107).
  • the difference image acquisition unit 23 calculates the difference between the reflection surface image multiplied by the correction coefficient ⁇ calculated in step S107 from the transmission image acquired in step S101, and the characteristics of the banknote table and the banknotes. A difference image including the stain on the table is acquired (step S108).
  • the difference image acquisition unit 23 acquires the difference image 308 by subtracting the reflection surface image 306 multiplied by the correction coefficient ⁇ 307 from the transmission image 305 as shown in FIG.
  • the front / back stain determination unit 27b detects the stain of the difference image acquired in step S108 by subtracting the difference image acquired in step S108 from the reference difference image of the denomination table specified in step S104 (step S108). S109). The front / back stain determination unit 27b detects the front / back stain 302 of the banknote as shown in FIG.
  • the front / back surface contamination determination unit 27b determines whether the contamination rate of the reflection surface image exceeds the contamination rate threshold stored in the contamination rate threshold memory 27c (step S110). When the stain ratio exceeds the stain ratio threshold value (step S110: Yes), the front / back stain determination unit 27b determines that the banknote is a stain ticket (step S111), and displays that fact on the display unit 5, as shown in FIG. The processing operation shown in FIG. Note that the user can recognize the banknote as a fouled ticket based on the display content of the display unit 5.
  • contamination determination part 27b determines whether the stain
  • the front / back stain determination unit 27b determines that the banknote is a stain ticket (step S111), and displays that fact on the display unit 5, as shown in FIG. The processing operation shown in FIG.
  • contamination determination part 27b judges that it is a normal banknote which can be used, ie, a genuine note, when the ratio of the contamination of a difference image does not exceed a contamination ratio threshold value (step S112: No), and processing operation shown in FIG. Exit.
  • step S113 the front and back specifying unit 27a determines that the characteristic that specifies the denomination is included in the reflection surface image, and proceeds to the processing operation of step S104. .
  • the denomination is determined based on the reflection surface image.
  • the denomination cannot be determined based on the reflection surface image.
  • the front / back specifying unit 27a stores the correction coefficient stored in the storage unit 3 in advance by the correction coefficient setting unit 29. Is set for each pixel as the correction coefficient ⁇ (step S114).
  • the difference image acquisition unit 23 acquires, for each pixel, the difference image on the reverse side of the banknote by subtracting the reflection surface image multiplied by the correction coefficient ⁇ set in step S114 from the transmission image acquired in step S101 ( Step S115).
  • the denomination determining unit 25 compares the back difference image with the back reference difference image stored in the storage unit 3, and stores the denomination stored in the storage unit 3 together with the matched back reference difference image. Based on the information, the denomination is specified (step S116).
  • the authenticity determination unit 26 determines whether the bill is a genuine note based on the transmission image acquired in step S101, the reflection surface image acquired in step S102, and the denomination determined in step S116 (step S117). .
  • the front / back surface contamination determination unit 27b detects the contamination of the reflection surface image by subtracting the reflection surface image acquired in step S102 from the reference reflection surface image stored in the storage unit 3 (step S118). In order to detect the contamination of the difference image obtained by the difference between the difference image and the reference difference image specified in step S116, the process proceeds to step S109.
  • the difference image including the feature of the banknote surface is obtained by subtracting the reflection surface image multiplied by the correction coefficient ⁇ from the transmission image, so that the transmission image and the reflection surface image are obtained.
  • the front and back sides of the banknotes can be individually identified. For example, even in the case of banknotes whose features appear only on one side, such as US dollar banknotes, the money can be quickly and accurately
  • the seed can be specified, and furthermore, highly accurate stain determination can be realized by individually identifying the stain on the front and back of the banknote.
  • the single light receiving element 12c that receives the transmitted light of the transmitting light emitting element 12a and the reflected light of the reflecting light emitting element 12b is used as a single unit.
  • the cost of parts can be reduced without increasing the number of parts.
  • the difference image is obtained by subtracting the reflection surface image obtained by multiplying the correction coefficient ⁇ stored in the storage unit 3 in advance from the transmission image, so that the product error is eliminated. Based on the reflection surface image, the transmission image, and the difference image, both sides of the banknote can be accurately identified.
  • the stain judgment unit 27 detects the stain of the banknote and calculates the correction coefficient ⁇ for correcting the reflection surface image based on these transmittance, reflectance, and stain detection value, A highly accurate difference image can be acquired based on the accurate correction coefficient ⁇ .
  • the correction coefficient ⁇ is calculated for each pixel, and the reflection surface image is corrected by multiplying the correction surface ⁇ by the correction coefficient ⁇ .
  • a predetermined number of pixels in the reflection surface image are obtained.
  • the reflection surface image may be divided into blocks, and the correction coefficient ⁇ may be calculated using the total value or the average value of the detection values for the pixels calculated in each block. Difference image acquisition processing can be performed.
  • correction coefficient (alpha) was calculated for every banknote which passes on a conveyance path, since the banknotes which pass continuously are adjacent and there are many levels of dirt, they are in many cases.
  • the correction coefficient ⁇ of the banknote at the same level is calculated, and the correction calculated at the same level without calculating the correction coefficient ⁇ of the next banknote
  • the coefficient ⁇ may be set sequentially. In this case, the burden of calculating the correction coefficient ⁇ can be greatly reduced.
  • the denomination is determined based on the reflection surface image.
  • the denomination may be determined based on the transmission image, and based on the transmission image and the reflection surface image.
  • the denomination may be determined. In this case, the denomination can be determined with high accuracy.

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Abstract

A paper sheet discriminating device in which a transmission image acquiring section acquires the transmitted image generated by transmitting paper money, a reflection surface image acquiring section acquires a reflection surface image of the one surface of the paper money, and a difference image acquiring section acquires the difference image in which the reflection surface image of the one surface thereof is differenced from the acquired transmitted image of the paper money and which enables the pollution determination or type specification of paper money to be realized with high precision by separately discriminating one surface out of both surfaces of the paper money on the basis of the transmitted image of the paper money acquired by the transmission image acquiring section, the reflection surface image thereof acquired by the reflection surface image acquiring section, and the difference image thereof acquired by the difference image acquiring section.

Description

紙葉類識別装置、紙葉類識別方法及び紙葉類識別プログラムPaper sheet identification device, paper sheet identification method, and paper sheet identification program
　本発明は、例えば、紙幣、小切手、手形や商品券等の紙葉類の画像情報を取得し、その画像情報から紙葉類を識別する紙葉類識別装置に関し、特に、紙葉類両面の内、片面を個別に識別することで、例えば、紙葉類の汚損判定や紙葉類の種別特定を高精度に行うことができる紙葉類識別装置、紙葉類識別方法及び紙葉類識別プログラムに関する。 The present invention relates to a paper sheet identification device that acquires image information of paper sheets such as banknotes, checks, bills, gift certificates, and the like, and identifies paper sheets from the image information. Among them, by identifying one side individually, for example, a paper sheet identification device, a paper sheet identification method, and a paper sheet identification capable of performing paper sheet contamination determination and paper sheet type specification with high accuracy Regarding the program.
　従来、例えば、紙幣、小切手、手形や商品券等の紙葉類に対して光を照射し、この紙葉類を透過して得られる画像情報から、その紙葉類の汚損判定や紙葉類の種別特定を行う紙葉類識別装置があることが知られている。 Conventionally, for example, paper sheets such as banknotes, checks, bills, gift certificates, etc. are irradiated with light, and the image information obtained by transmitting through the paper sheets is used to determine whether the paper sheets are dirty or not. It is known that there is a paper sheet identification device for specifying the type of the paper.
　例えば、特許文献１に記載の紙葉類識別装置では、紙葉類の片面に光を照射して、この紙葉類を透過して得られる紙葉類表裏の透過画像情報から予め準備した片面の基準画像情報を差分することにより、光を照射した片面側の画像情報を取得して、その片面側の画像情報に基づき、紙葉類を識別するようにしていた。 For example, in the paper sheet identification apparatus described in Patent Document 1, one side prepared in advance from transmission image information on the front and back of a paper sheet obtained by irradiating light on one side of the paper sheet and transmitting through the paper sheet By subtracting the reference image information, image information on one side irradiated with light is acquired, and paper sheets are identified based on the image information on the one side.
特開平９－３３０４４９号公報JP 9-330449 A
　しかしながら、従来の紙葉類識別装置では、紙葉類の片面に光を照射して、この紙葉類を透過して得られる紙葉類表裏の透過画像情報から予め準備した片面の基準画像情報を差分することにより、光を照射した片面側の画像情報を取得し、その片面側の画像情報に基づき、紙葉類の識別を行うようにしたが、もう他方の片面に関しては、その紙葉類の画像情報を取得することができないため、その他方の片面側の画像情報に基づき、紙葉類を識別することができないという問題点があった。 However, in the conventional paper sheet identification device, one side of the reference image information prepared in advance from the transmission image information on the front and back of the paper sheet obtained by irradiating one side of the paper sheet and transmitting through the paper sheet To obtain image information on one side irradiated with light and identify paper sheets based on the image information on one side, but for the other one side, Since it is not possible to acquire the image information of the kind, there is a problem that the paper sheet cannot be identified based on the image information on the other side.
　また、図７に示すように従来の紙葉類識別装置では、例えば、紙幣の表６０１に汚損６０２、且つ紙幣の裏６０３にも汚損６０４がある場合に、紙幣の表６０１に光を照射して得られた透過画像６０５から、記憶部６０６に予め準備した裏６０３の基準画像６０７に補正係数βを乗じ、それを差分することにより、差分画像６０９を取得し、この取得した差分画像６０９から紙幣の汚損有無を識別するようにしていた。 Further, as shown in FIG. 7, in the conventional paper sheet identification device, for example, when the banknote table 601 has a stain 602 and the banknote back 603 also has a stain 604, the banknote table 601 is irradiated with light. A difference image 609 is obtained by multiplying the reference image 607 of the back 603 prepared in advance in the storage unit 606 by the correction coefficient β and subtracting the difference image 609 from the obtained transmission image 605, and from the obtained difference image 609. The banknotes were identified for the presence or absence of banknotes.
　しかしながら、このような従来の紙葉類識別装置では、差分画像６０９に表６０１の汚損６０２の他に裏６０３の汚損６０４も表れてしまうことになるため、紙幣のどちらの面に汚損があるか否かを区別することができないという問題点があった。 However, in such a conventional paper sheet identification device, the stain 604 of the back 603 appears in the difference image 609 in addition to the stain 602 of the table 601. There was a problem that it was not possible to distinguish whether or not.
　しかも、従来の紙葉類識別装置では、紙幣の片面の汚損の割合が所定汚損割合閾値を超えた場合に、同紙幣を汚損券と判断する汚損判定を紙幣の両面についてそれぞれ行うようにしているが、取得した差分画像６０９に基づき、汚損判定をする際、例えば紙幣の表６０１に１箇所しか汚損６０２がないにもかかわらず、差分画像６０９には紙幣の裏６０３の汚損６０４をも含まれてしまうことになる。 In addition, in the conventional paper sheet identification device, when the rate of stain on one side of a bill exceeds a predetermined stain rate threshold, the stain judgment for judging the bill as a stain ticket is performed for both sides of the bill. However, when making a stain determination based on the acquired difference image 609, the difference image 609 also includes a stain 604 on the back 603 of the banknote, even though the banknote table 601 has only one stain 602. Will end up.
　つまり、このような従来の紙葉類識別装置では、これら２つの汚損６０２及び６０４が片面にあるものと判断され、その片面の汚損の割合が所定汚損割合閾値を超えてしまった場合、同紙幣を汚損券と誤って判断されてしまうという問題点もあった。 That is, in such a conventional paper sheet identification device, when it is determined that these two stains 602 and 604 are on one side and the rate of stain on one side exceeds a predetermined stain rate threshold, There was also a problem that it was mistakenly judged as a smudge ticket.
　また、従来の紙葉類識別装置では、例えば紙幣の表を光照射面とした状態で紙幣が投入されると、紙幣の表に光を照射して、紙幣の表から見た透過画像を取得し、紙幣の表の特徴が含まれる差分画像を取得するようにしている。また、逆に、従来の紙葉類識別装置では、例えば紙幣の裏を光照射面とした状態で紙幣が投入されると、紙幣の裏に光を照射して、紙幣の裏から見た透過画像を取得し、紙幣の裏の特徴が含まれる差分画像を取得するようにしている。 Moreover, in the conventional paper sheet identification device, for example, when a banknote is inserted in a state where the front of the banknote is used as a light irradiation surface, light is applied to the front of the banknote and a transmission image viewed from the front of the banknote is acquired. And the difference image in which the characteristic of the table | surface of a banknote is included is acquired. On the contrary, in the conventional paper sheet identification device, for example, when a banknote is inserted in a state where the back side of the banknote is used as a light irradiation surface, the back side of the banknote is irradiated with light, and the transmission seen from the back side of the banknote An image is acquired, and a difference image including the features on the back of the banknote is acquired.
　しかしながら、このような従来の紙葉類識別装置では、アメリカドル紙幣のように、紙幣の片面にしか特徴が表れないような紙幣の場合、特徴が表れない面を光照射面とした状態で紙幣が投入されると、取得した差分画像に含まれる特徴に基づいて紙幣種別を特定することができない。 However, in such a conventional paper sheet identification device, in the case of a banknote whose feature appears only on one side of the banknote, such as a US dollar banknote, the banknote is in a state where the surface where the feature does not appear is a light irradiation surface. Is inserted, the bill type cannot be specified based on the characteristics included in the acquired difference image.
　そこで、このような事態に考慮して、磁気センサを使用して紙幣種別を特定することも考えられるが、磁気センサ等を別個に設ける必要があるため、部品コストも増加し、しかも、磁気センサを使用した紙幣種別の特定には、複雑な処理を要することになるため、多大な処理時間を要するという問題点があった。 Therefore, in consideration of such a situation, it may be possible to specify the bill type using a magnetic sensor. However, since it is necessary to provide a magnetic sensor or the like separately, the cost of parts increases, and the magnetic sensor In order to specify the type of banknote using, a complicated process is required, which requires a great deal of processing time.
　尚、このような問題は、紙幣を対象とする場合だけではなく、小切手、手形や商品券等の各種紙葉類を対象とする場合にも同様に起こりうる。 Note that such a problem can occur not only when bills are targeted but also when various paper sheets such as checks, bills and gift certificates are targeted.
　本発明は、上記問題点を解決するためになされたものであって、紙葉類両面の内、片面を個別に識別することができる紙葉類識別装置、紙葉類識別方法及び紙葉類識別プログラムを提供することを目的とする。 The present invention has been made to solve the above-described problems, and is a paper sheet identification device, a paper sheet identification method, and a paper sheet that can individually identify one of both sides of a paper sheet. The purpose is to provide an identification program.
　また、本発明は、紙葉類の表及び裏の汚損を個別に識別することで、高精度な汚損判定を実現できる紙葉類識別装置、紙葉類識別方法及び紙葉類識別プログラムを提供することを目的とする。 In addition, the present invention provides a paper sheet identification device, a paper sheet identification method, and a paper sheet identification program capable of realizing highly accurate contamination determination by individually identifying the front and back contamination of a paper sheet. The purpose is to do.
　さらに、本発明は、片面にしか特徴が表れないような紙葉類の場合でも、部品コストの大幅軽減を図りながら、短時間で、高精度な紙葉類種別の特定を実現できる紙葉類識別装置、紙葉類識別方法及び紙葉類識別プログラムを提供することを目的とする。 Furthermore, the present invention provides a paper sheet that can realize a highly accurate specification of a paper sheet type in a short time while significantly reducing the parts cost even in the case of a paper sheet whose characteristics only appear on one side. An object is to provide an identification device, a paper sheet identification method, and a paper sheet identification program.
　上記目的を達成するために、請求項１の発明に係る紙葉類識別装置は、紙葉類を透過して透過画像を取得する透過画像取得手段と、前記紙葉類片面の反射面画像を取得する反射面画像取得手段と、前記透過画像取得手段にて取得した前記紙葉類の前記透過画像から前記反射面画像取得手段にて取得した前記紙葉類片面の反射面画像を差分した差分画像を取得する差分画像取得手段と、前記紙葉類の前記透過画像、前記反射面画像及び前記差分画像に基づき、前記紙葉類を識別する紙葉類識別手段とを有することを特徴とする。 In order to achieve the above object, a paper sheet identification apparatus according to the invention of claim 1 includes transmission image acquisition means for acquiring a transmission image through a paper sheet, and a reflection surface image of one side of the paper sheet. A difference obtained by subtracting the reflection surface image of one side of the paper sheet acquired by the reflection surface image acquisition unit from the transmission image of the paper sheet acquired by the transmission surface image acquisition unit and the reflection surface image acquisition unit to acquire A differential image acquisition unit configured to acquire an image; and a paper sheet identification unit configured to identify the paper sheet based on the transmission image, the reflection surface image, and the difference image of the paper sheet. .
　また、請求項２の発明に係る紙葉類識別装置では、前記紙葉類を透過する透過光を前記紙葉類に照射する透過光照射手段と、前記紙葉類片面に光を照射する反射光照射手段と、前記透過光照射手段にて照射した前記透過光を受光すると共に、前記反射光照射手段にて照射した光の反射光を受光する受光手段とを有し、前記透過画像取得手段は、前記受光手段にて前記透過光を受光して前記紙葉類の透過画像を取得し、前記反射面画像取得手段は、前記受光手段にて前記反射光を受光して前記紙葉類の反射面画像を取得することを特徴とする。 In the paper sheet identification apparatus according to the second aspect of the present invention, transmitted light irradiating means for irradiating the paper sheet with transmitted light that passes through the paper sheet, and reflection for irradiating light on one side of the paper sheet. A light irradiating means; and a light receiving means for receiving the transmitted light irradiated by the transmitted light irradiating means and receiving reflected light of the light irradiated by the reflected light irradiating means, and the transmitted image acquiring means Receives the transmitted light by the light receiving means to acquire a transmission image of the paper sheet, and the reflection surface image acquisition means receives the reflected light by the light receiving means and receives the reflected light of the paper sheet. A reflection surface image is acquired.
　また、請求項３の発明に係る紙葉類識別装置では、前記透過画像から前記反射面画像が高精度に差分できるように前記差分画像取得手段の補正係数を設定する補正係数設定手段を有することを特徴とする。 The paper sheet identifying apparatus according to claim 3 further includes a correction coefficient setting unit that sets a correction coefficient of the difference image acquisition unit so that the reflection surface image can be accurately differentiated from the transmission image. It is characterized by.
　また、請求項４の発明に係る紙葉類識別装置では、前記透過画像取得手段にて取得した前記透過画像及び前記反射面画像取得手段にて取得した前記反射面画像に基づき、前記補正係数設定手段にて設定した前記補正係数を変更可能にする補正係数設定変更手段を有することを特徴とする。 In the paper sheet identification apparatus according to the invention of claim 4, the correction coefficient setting is based on the transmission image acquired by the transmission image acquisition unit and the reflection surface image acquired by the reflection surface image acquisition unit. And correction coefficient setting changing means for changing the correction coefficient set by the means.
　また、請求項５の発明に係る紙葉類識別装置では、前記紙葉類識別手段は、前記透過画像及び／又は前記反射面画像に基づき、前記紙葉類の種別を特定できたか否かを判定し、前記透過画像及び／又は前記反射面画像に基づき、前記紙葉類の種別を特定できなかった場合、前記差分画像に基づき、前記紙葉類の種別を特定する紙葉類種別特定手段を有することを特徴とする。 In the paper sheet identification apparatus according to the invention of claim 5, the paper sheet identification means determines whether or not the type of the paper sheet has been specified based on the transmission image and / or the reflection surface image. A paper sheet type specifying unit that determines the type of the paper sheet based on the difference image when the paper sheet type cannot be specified based on the transmission image and / or the reflection surface image. It is characterized by having.
　また、請求項６の発明に係る紙葉類識別装置では、前記紙葉類識別手段は、前記透過画像及び前記反射面画像に基づき、前記紙葉類の真偽を判定する真偽判定手段を有することを特徴とする。 Further, in the paper sheet identification apparatus according to the invention of claim 6, the paper sheet identification means includes authenticity determination means for determining the authenticity of the paper sheet based on the transmission image and the reflection surface image. It is characterized by having.
　また、請求項７の発明に係る紙葉類識別装置では、前記紙葉類識別手段は、前記反射面画像に基づき、前記紙葉類の一方片面側の汚損有無を判定すると共に、前記差分画像に基づき、前記紙葉類の他方片面側の汚損有無を判定する汚損判定手段を有することを特徴とする。 Further, in the paper sheet identification apparatus according to the invention of claim 7, the paper sheet identification means determines the presence or absence of fouling on one side of the paper sheet based on the reflection surface image, and the difference image. Based on the above, the present invention is characterized in that there is a contamination determination means for determining whether the other side of the paper sheet is stained.
　また、請求項８の発明に係る紙葉類識別装置では、前記汚損判定手段は、前記反射面画像に基づき、前記一方片面側を前記紙葉類の表又は裏として特定すると共に、この特定結果に基づき、前記他方片面側を前記紙葉類の裏又は表として特定する表裏特定手段と、前記表裏特定手段にて特定した紙葉類の表側の汚損有無を判定すると共に、前記紙葉類の裏側の汚損有無を判定する表裏汚損判定手段とを有することを特徴とする。 Further, in the paper sheet identification apparatus according to the invention of claim 8, the stain determination means specifies the one side as the front or back of the paper sheet based on the reflection surface image, and the specification result Based on the front and back specifying means for specifying the other side as the back or front of the paper sheet, and determining whether or not the front side of the paper sheet specified by the front and back specifying means is soiled, It has a front and back fouling judgment means for judging the presence or absence of fouling on the back side.
　また、請求項９の発明に係る紙葉類識別方法では、紙葉類を透過して透過画像を取得する透過画像取得ステップと、前記紙葉類片面の反射面画像を取得する反射面画像取得ステップと、前記透過画像取得ステップにて取得した前記紙葉類の前記透過画像から前記反射面画像取得ステップにて取得した前記紙葉類片面の反射面画像を差分した差分画像を取得する差分画像取得ステップと、前記紙葉類の前記透過画像、前記反射面画像及び前記差分画像に基づき、前記紙葉類を識別する紙葉類識別ステップとを含むことを特徴とする。 In the paper sheet identification method according to the ninth aspect of the invention, a transmission image acquisition step of acquiring a transmission image through the paper sheet, and a reflection surface image acquisition for acquiring a reflection surface image of one side of the paper sheet A difference image that obtains a difference image obtained by subtracting the reflection surface image of one side of the paper sheet acquired in the reflection surface image acquisition step from the transmission image of the paper sheet acquired in the step and the transmission image acquisition step An acquisition step; and a paper sheet identification step for identifying the paper sheet based on the transmission image, the reflection surface image, and the difference image of the paper sheet.
　また、請求項１０の発明に係る紙葉類識別プログラムでは、紙葉類を透過して透過画像を取得する透過画像取得手順と、前記紙葉類片面の反射面画像を取得する反射面画像取得手順と、前記透過画像取得手順にて取得した前記紙葉類の前記透過画像から前記反射面画像取得手順にて取得した前記紙葉類片面の反射面画像を差分した差分画像を取得する差分画像取得手順と、前記紙葉類の前記透過画像、前記反射面画像及び前記差分画像に基づき、前記紙葉類を識別する紙葉類識別手順とを含むプログラムをコンピュータに実行させることを特徴とする。 In the paper sheet identification program according to the invention of claim 10, a transmission image acquisition procedure for acquiring a transmission image through the paper sheet and a reflection surface image acquisition for acquiring a reflection surface image of one side of the paper sheet. A difference image that obtains a difference image obtained by subtracting a reflection surface image of one side of the paper sheet acquired by the reflection surface image acquisition procedure from the transmission image of the paper sheet acquired by the procedure and the transmission image acquisition procedure A computer is caused to execute a program including an acquisition procedure and a paper sheet identification procedure for identifying the paper sheet based on the transmission image, the reflection surface image, and the difference image of the paper sheet. .
　請求項１の発明によれば、紙葉類を透過して透過画像を取得する透過画像取得手段と、前記紙葉類片面の反射面画像を取得する反射面画像取得手段と、前記透過画像取得手段にて取得した前記紙葉類の前記透過画像から前記反射面画像取得手段にて取得した前記紙葉類片面の反射面画像を差分した差分画像を取得する差分画像取得手段と、前記紙葉類の前記透過画像、前記反射面画像及び前記差分画像に基づき、前記紙葉類を識別する紙葉類識別手段とを有することを特徴とするため、紙葉類両面の内、片面を個別に識別することで、例えば、紙葉類の汚損判定や紙葉類の種別特定を高精度に実現することができる。 According to the first aspect of the present invention, the transmission image acquisition means for acquiring the transmission image through the paper sheet, the reflection surface image acquisition means for acquiring the reflection surface image of one side of the paper sheet, and the transmission image acquisition Difference image acquisition means for acquiring a difference image obtained by subtracting the reflection surface image of one side of the paper sheet acquired by the reflection surface image acquisition means from the transmission image of the paper sheet acquired by means; and the paper sheet Paper sheet identifying means for identifying the paper sheet based on the transmission image, the reflection surface image, and the difference image of the paper sheet. By identifying, for example, it is possible to accurately determine the contamination of paper sheets and specify the type of paper sheets.
　また、請求項２の発明によれば、前記紙葉類を透過する透過光を前記紙葉類に照射する透過光照射手段と、前記紙葉類片面に光を照射する反射光照射手段と、前記透過光照射手段にて照射した前記透過光を受光すると共に、前記反射光照射手段にて照射した光の反射光を受光する受光手段とを有し、前記透過画像取得手段は、前記受光手段にて前記透過光を受光して前記紙葉類の透過画像を取得し、前記反射面画像取得手段は、前記受光手段にて前記反射光を受光して前記紙葉類の反射面画像を取得することを特徴とするため、上記請求項１記載の効果に加えて、２種類の透過光及び反射光を受光する受光手段で一個に兼用することで、高価な受光手段を増設することなく、部品コストの抑制を図ることができる。 Further, according to the invention of claim 2, transmitted light irradiating means for irradiating the paper with transmitted light that transmits the paper, reflected light irradiating means for irradiating light on one side of the paper, A light receiving means for receiving the transmitted light irradiated by the transmitted light irradiating means and receiving reflected light of the light irradiated by the reflected light irradiating means; and the transmitted image acquiring means is the light receiving means. Receiving the transmitted light to acquire a transmission image of the paper sheet, and the reflection surface image acquisition unit receives the reflection light by the light reception unit to acquire a reflection surface image of the paper sheet Therefore, in addition to the effect of claim 1, the light receiving means for receiving two kinds of transmitted light and reflected light can be combined into one, without adding an expensive light receiving means, The cost of parts can be reduced.
　また、請求項３の発明によれば、前記透過画像から前記反射面画像が高精度に差分できるように前記差分画像取得手段の補正係数を設定する補正係数設定手段を有することを特徴とするため、上記請求項１又は２記載の効果に加えて、紙葉類両面の内、片面を識別することができる。 According to a third aspect of the invention, there is provided correction coefficient setting means for setting a correction coefficient of the difference image acquisition means so that the reflection surface image can be accurately differentiated from the transmission image. In addition to the effect of the first or second aspect, one side of the paper sheets can be identified.
　また、請求項４の発明によれば、前記透過画像取得手段にて取得した前記透過画像及び前記反射面画像取得手段にて取得した前記反射面画像に基づき、前記補正係数設定手段にて設定した前記補正係数を変更可能にする補正係数設定変更手段を有することを特徴とするため、上記請求項３記載の効果に加えて、製品誤差を解消しながら、紙葉類両面の内、片面を正確に識別することができる。 According to the invention of claim 4, the correction coefficient setting unit sets the transmission image acquired by the transmission image acquisition unit and the reflection surface image acquired by the reflection surface image acquisition unit. Since it has a correction coefficient setting changing means for enabling the correction coefficient to be changed, in addition to the effect of the above-mentioned claim 3, while correcting the product error, one side of the paper sheet is accurately set. Can be identified.
　また、請求項５の発明によれば、前記紙葉類識別手段は、前記透過画像及び／又は前記反射面画像に基づき、前記紙葉類の種別を特定できたか否かを判定し、前記透過画像及び／又は前記反射面画像に基づき、前記紙葉類の種別を特定できなかった場合、前記差分画像に基づき、前記紙葉類の種別を特定する紙葉類種別特定手段を有することを特徴とするため、上記請求項１又は２記載の効果に加えて、片面にしか特徴が表れないような紙葉類の場合でも、部品コストの軽減を図りながら、短時間で高精度な紙葉類種別の特定を実現することができる。 According to a fifth aspect of the present invention, the paper sheet identifying means determines whether or not the type of the paper sheet has been specified based on the transmission image and / or the reflection surface image, and the transmission When the paper sheet type cannot be specified based on the image and / or the reflection surface image, the paper sheet type specifying means for specifying the paper sheet type based on the difference image is provided. Therefore, in addition to the effect described in claim 1 or 2, even in the case of paper sheets whose features appear only on one side, the high-precision paper sheets in a short time while reducing the component cost The type can be specified.
　また、請求項６の発明によれば、前記紙葉類識別手段は、前記透過画像及び前記反射面画像に基づき、前記紙葉類の真偽を判定する真偽判定手段を有することを特徴とするため、上記請求項１又は２記載の効果に加えて、部品コストの軽減を図りながら、高精度な紙葉の真偽判定を実現することができる。 According to a sixth aspect of the present invention, the paper sheet identifying means includes authenticity determination means for determining the authenticity of the paper sheet based on the transmission image and the reflection surface image. Therefore, in addition to the effect of the first or second aspect, it is possible to realize a highly accurate determination of the authenticity of the paper sheet while reducing the component cost.
　また、請求項７の発明によれば、前記紙葉類識別手段は、前記反射面画像に基づき、前記紙葉類の一方片面側の汚損有無を判定すると共に、前記差分画像に基づき、前記紙葉類の他方片面側の汚損有無を判定する汚損判定手段を有することを特徴とするため、上記請求項１又は２記載の効果に加えて、紙葉類両面の内、片面を個別に識別することで、高精度な汚損判定を実現することができる。 According to the invention of claim 7, the paper sheet identifying means determines the presence or absence of contamination on one side of the paper sheet based on the reflection surface image, and based on the difference image, the paper sheet In addition to the effect of claim 1 or 2, in addition to the effect described in claim 1 or 2, in addition to the effect described in claim 1 or 2 above, one side of each sheet is individually identified. Thus, it is possible to realize a highly accurate stain determination.
　また、請求項８の発明によれば、前記汚損判定手段は、前記反射面画像に基づき、前記一方片面側を前記紙葉類の表又は裏として特定すると共に、この特定結果に基づき、前記他方片面側を前記紙葉類の裏又は表として特定する表裏特定手段と、前記表裏特定手段にて特定した紙葉類の表側の汚損有無を判定すると共に、前記紙葉類の裏側の汚損有無を判定する表裏汚損判定手段とを有することを特徴とするため、上記請求項５記載の効果に加えて、紙葉類の表及び裏の汚損を個別に識別することで、高精度な汚損判定を実現することができる。 Further, according to the invention of claim 8, the stain determination means specifies the one side as the front or back of the paper sheet based on the reflection surface image, and based on the specification result, the other side Front / back specifying means for specifying one side as the back or front of the paper sheet, and determining whether the front side of the paper sheet specified by the front / back specifying means is fouled, and whether the back side of the paper sheet is fouled In addition to the effect of claim 5, the front and back stains of the paper sheet are individually identified for stains with high accuracy. Can be realized.
　また、請求項９の発明によれば、紙葉類を透過して透過画像を取得する透過画像取得ステップと、前記紙葉類片面の反射面画像を取得する反射面画像取得ステップと、前記透過画像取得ステップにて取得した前記紙葉類の前記透過画像から前記反射面画像取得ステップにて取得した前記紙葉類片面の反射面画像を差分した差分画像を取得する差分画像取得ステップと、前記紙葉類の前記透過画像、前記反射面画像及び前記差分画像に基づき、前記紙葉類を識別する紙葉類識別ステップとを含むことを特徴とするため、紙葉類両面の内、片面を個別に識別することで、例えば、紙葉類の汚損判定や紙葉類種別の特定を高精度に実現することができる。 According to the invention of claim 9, a transmission image acquisition step of acquiring a transmission image by transmitting paper sheets, a reflection surface image acquisition step of acquiring a reflection surface image of one side of the paper sheets, and the transmission A difference image acquisition step of acquiring a difference image obtained by subtracting the reflection surface image of the one side of the paper sheet acquired in the reflection surface image acquisition step from the transmission image of the paper sheet acquired in the image acquisition step; A paper sheet identification step for identifying the paper sheet based on the transmission image, the reflection surface image, and the difference image of the paper sheet. By individually identifying, for example, it is possible to determine the contamination of paper sheets and specify the type of paper sheet with high accuracy.
　また、請求項１０の発明によれば、紙葉類を透過して透過画像を取得する透過画像取得手順と、前記紙葉類片面の反射面画像を取得する反射面画像取得手順と、前記透過画像取得手順にて取得した前記紙葉類の前記透過画像から前記反射面画像取得手順にて取得した前記紙葉類片面の反射面画像を差分した差分画像を取得する差分画像取得手順と、前記紙葉類の前記透過画像、前記反射面画像及び前記差分画像に基づき、前記紙葉類を識別する紙葉類識別手順とを含むプログラムをコンピュータに実行させることを特徴とするため、紙葉類両面の内、片面を個別に識別することで、例えば、紙葉類の汚損判定や紙葉類種別の特定を高精度に実現することができる。 According to the invention of claim 10, a transmission image acquisition procedure for acquiring a transmission image by transmitting paper sheets, a reflection surface image acquisition procedure for acquiring a reflection surface image of one side of the paper sheets, and the transmission A difference image acquisition procedure for acquiring a difference image obtained by subtracting the reflection surface image of the one side of the paper sheet acquired by the reflection surface image acquisition procedure from the transmission image of the paper sheet acquired by the image acquisition procedure; To cause a computer to execute a program including a paper sheet identification procedure for identifying the paper sheet based on the transmission image, the reflection surface image, and the difference image of the paper sheet. By individually identifying one of the two surfaces, for example, it is possible to accurately determine the contamination of a paper sheet and specify the type of paper sheet.
図１は、本実施例の紙幣識別装置内部の概略構成を示すブロック図である。FIG. 1 is a block diagram showing a schematic configuration inside the banknote recognition apparatus of the present embodiment. 図２は、紙幣識別装置内部の搬送路上のセンサの配置構成を端的に示す説明図である。FIG. 2 is an explanatory view briefly showing the arrangement configuration of sensors on the conveyance path inside the banknote recognition apparatus. 図３は、紙幣の４種類の基準パターンを端的に示す説明図である。FIG. 3 is an explanatory diagram simply showing four types of reference patterns of banknotes. 図４は、紙幣の汚損と透過率との関係を端的に示す説明図ある。FIG. 4 is an explanatory diagram that briefly shows the relationship between banknote fouling and transmittance. 図５は、紙幣識別装置の紙幣識別処理に関わる制御部内部の処理動作を示すフローチャートである。FIG. 5 is a flowchart showing the processing operation inside the control unit related to the bill recognition process of the bill recognition device. 図６は、紙幣識別装置の動作概要を端的に示す説明図である。FIG. 6 is an explanatory view briefly showing an outline of the operation of the banknote recognition apparatus. 図７は、従来の紙葉類識別装置の動作概要を端的に示す説明図である。FIG. 7 is an explanatory view briefly showing an outline of the operation of the conventional paper sheet identification apparatus.
符号の説明Explanation of symbols
　　　１　　紙幣識別装置
　　　２　　紙幣搬送識別機構
　　　３　　記憶部
　　　４　　操作部
　　　５　　表示部
　　　６　　制御部
　　　１１　タイミングセンサ
　　　１１ａ　発光素子
　　　１１ｂ　受光素子
　　　１２　ラインセンサ
　　　１２ａ　透過用発光素子
　　　１２ｂ　反射用発光素子
　　　１２ｃ　受光素子
　　　１３　メカ機構
　　　２１　透過画像取得部
　　　２２　反射面画像取得部
　　　２３　差分画像取得部
　　　２４　メカ機構制御部
　　　２５　金種判定部
　　　２６　真偽判定部
　　　２７　汚損判定部
　　　２７ａ　表裏特定部
　　　２７ｂ　表裏汚損判定部
　　　２７ｃ　汚損割合閾値メモリ
　　　２８　補正係数算出部
　　　２９　補正係数設定部
　　　３０　補正係数メモリ
　　　３０５　透過画像
　　　３０６　反射面画像
　　　３０７　補正係数
　　　３０８　差分画像 DESCRIPTION OF SYMBOLS 1 Banknote identification apparatus 2 Banknote conveyance recognition mechanism 3 Memory | storage part 4 Operation part 5 Display part 6 Control part 11 Timing sensor 11a Light emitting element 11b Light receiving element 12 Line sensor 12a Light emitting element for transmission 12b Light emitting element for reflection 12c Light receiving element 13 Mechanical mechanism 21 Transmission image acquisition unit 22 Reflection surface image acquisition unit 23 Difference image acquisition unit 24 Mechanical mechanism control unit 25 Denomination determination unit 26 Authenticity determination unit 27 Fouling determination unit 27a Front / back identification unit 27b Front / back contamination determination unit 27c Fouling ratio threshold memory 28 Correction Coefficient calculation unit 29 Correction coefficient setting unit 30 Correction coefficient memory 305 Transmission image 306 Reflecting surface image 307 Correction coefficient 308 Difference image
　以下に、本発明の一実施例について、添付図面を参照しながら具体的に説明する。ここでは、紙幣を識別する紙幣識別装置に対して本発明を適用した場合を例に挙げて説明する。 Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings. Here, the case where this invention is applied with respect to the banknote identification device which identifies a banknote is mentioned as an example, and is demonstrated.
　本実施例の紙幣識別装置は、紙幣を透過して透過画像を取得すると共に、紙幣両面の内、片面の反射面画像を取得し、さらに透過画像から反射面画像を差分した差分画像を取得することで、これら取得した透過画像、反射面画像及び差分画像に基づき、紙幣両面の内、片面を個別に識別できるようにした。その結果、紙幣の汚損判定、紙幣の種別の特定及び紙幣の真偽判定を高精度に実現することができる。 The banknote identification apparatus according to the present embodiment transmits a banknote and acquires a transmission image, acquires a reflection surface image on one side of both sides of the banknote, and further acquires a difference image obtained by subtracting the reflection surface image from the transmission image. Thus, based on the acquired transmission image, reflection surface image, and difference image, one side of both banknotes can be individually identified. As a result, it is possible to realize banknote stain determination, banknote type identification, and banknote authenticity determination with high accuracy.
　図１は、本実施例の紙幣識別装置内部の概略構成を示すブロック図である。図１に示す紙幣識別装置１は、紙幣を搬送する搬送路上の各種センサ等を含む紙幣搬送識別機構２と、画像情報等の各種情報を記憶する記憶部３と、操作開始ボタン等の各種ボタンを含む操作部４と、識別結果等の各種情報を表示する表示部５と、紙幣識別装置１全体を制御する制御部６とを有している。 FIG. 1 is a block diagram showing a schematic configuration inside the banknote recognition apparatus of the present embodiment. A banknote identification device 1 shown in FIG. 1 includes a banknote transport identification mechanism 2 including various sensors on a transport path for transporting banknotes, a storage unit 3 that stores various information such as image information, and various buttons such as an operation start button. , A display unit 5 that displays various information such as identification results, and a control unit 6 that controls the entire bill recognition device 1.
　紙幣搬送識別機構２は、搬送路上の紙幣の通過タイミングを検出するタイミングセンサ１１と、搬送路上の紙幣に対して紙幣画像を検出するラインセンサ１２と、搬送路上の紙幣を搬送するローラやモータ等のメカ機構１３とを有している。 The banknote transport identification mechanism 2 includes a timing sensor 11 that detects the passage timing of banknotes on the transport path, a line sensor 12 that detects a banknote image with respect to banknotes on the transport path, a roller and a motor that transport banknotes on the transport path, and the like. The mechanical mechanism 13 is provided.
　図２は、紙幣識別装置１内部の搬送路上のセンサの配置構成を端的に示す説明図であって、（Ａ）は、搬送路の平面図、（Ｂ）は搬送路の側面図である。図２に示す搬送路上の入口及び出口には、前述した合計４個のタイミングセンサ１１を配置し、搬送路の中央部にはラインセンサ１２が配置してある。 FIG. 2 is an explanatory view briefly showing the arrangement configuration of sensors on the conveyance path inside the banknote recognition apparatus 1, wherein (A) is a plan view of the conveyance path and (B) is a side view of the conveyance path. A total of four timing sensors 11 described above are arranged at the entrance and exit on the conveyance path shown in FIG. 2, and a line sensor 12 is arranged at the center of the conveyance path.
　タイミングセンサ１１は、搬送路上の搬送面に光を照射する発光素子１１ａと、発光素子１１ａからの光を受光する受光素子１１ｂとを有し、受光素子１１ｂは、搬送路上の紙幣通過に伴う遮光で紙幣の通過タイミングを検出するものである。 The timing sensor 11 includes a light emitting element 11a that irradiates light on the conveyance surface on the conveyance path and a light receiving element 11b that receives light from the light emitting element 11a. The bill passage timing is detected.
　ラインセンサ１２は、搬送路上の搬送面の上下一方の側に透過光を照射する透過用発光素子１２ａと、その反対側に透過光を受光する受光素子１２ｃとを有し、受光素子１２ｃは、受光した透過光に基づき、紙幣の透過画像を検出するものである。図２は透過用発光素子１２ａを搬送路の上側に配置したものである。 The line sensor 12 includes a transmission light emitting element 12a that irradiates transmitted light on one of the upper and lower sides of the conveyance surface on the conveyance path, and a light receiving element 12c that receives the transmitted light on the opposite side. A transmitted image of a banknote is detected based on the received transmitted light. In FIG. 2, the light-emitting element 12a for transmission is arranged on the upper side of the transport path.
　また、ラインセンサ１２は、搬送路上の搬送面の上下方向で同じ方向に反射光を照射する反射用発光素子１２ｂと、反射光を受光する受光素子１２ｃとを有し、受光素子１２ｃは、受光した反射光に基づき、紙幣の反射面画像を検出するものである。図２は反射用発光素子１２ｂを搬送路の下側に配置したものである。 The line sensor 12 includes a reflection light emitting element 12b that irradiates reflected light in the same direction in the vertical direction of the transport surface on the transport path, and a light receiving element 12c that receives the reflected light. The reflection surface image of a banknote is detected based on the reflected light. In FIG. 2, the reflective light emitting element 12b is arranged below the conveyance path.
　尚、紙幣識別装置１の図示せぬ投入口に投入された紙幣は、各紙幣を表又は裏いずれかの面を投入口に対して上向きにして投入してもよく、さらに、各紙幣に印刷されている文字列や図柄を人が認識するのに最も適した方向（以下、単に特定方向と称する）、又は、その逆の方向のいずれかの方向で投入しても良く、搬送路上を一枚づつ通過することになる。 In addition, the banknote thrown into the insertion port which is not shown of the banknote identification device 1 may insert each banknote with either the front or back side facing up to the insertion port, and furthermore, it prints on each banknote. It may be inserted in either the direction most suitable for human recognition of the character string or the pattern that is displayed (hereinafter simply referred to as a specific direction) or the opposite direction. You will pass one by one.
　搬送路上の紙幣搬送識別機構２は、紙幣の表を投入口に対して上向きにして投入された場合、発光素子１１ａ及び透過用発光素子１２ａから搬送路上の紙幣の表に光を照射し、逆に、紙幣の裏を投入口に対して上向きにして投入された場合は、発光素子１１ａ及び透過用発光素子１２ａから搬送路上の紙幣の裏に光を照射することになる。尚、図２では、紙幣の表を投入口に対して上向きに投入された例を示している。 The bill conveyance identification mechanism 2 on the conveyance path irradiates light on the front of the banknote on the conveyance path from the light emitting element 11a and the transmission light emitting element 12a when the banknote is turned upward with respect to the insertion slot. When the bill is inserted with the back side of the bill facing upward, the light is emitted from the light emitting element 11a and the light emitting element 12a for transmission onto the back side of the bill on the conveyance path. FIG. 2 shows an example in which the banknote table is inserted upward with respect to the insertion slot.
　紙幣識別装置１には、図３に示すように紙幣毎に表向き且つ特定方向の基準パターン４０１、裏向き且つ特定方向の基準パターン４０２、表向き且つ特定方向と逆方向の基準パターン４０３及び裏向き且つ特定方向と逆方向の基準パターン４０４の４種類の基準パターン画像がある。 As shown in FIG. 3, the banknote identification device 1 includes a reference pattern 401 facing upward and in a specific direction, a reference pattern 402 facing back and in a specific direction, a reference pattern 403 facing forward and in a direction opposite to the specific direction, and There are four types of reference pattern images of reference patterns 404 in the direction opposite to the specific direction.
　記憶部３には、紙幣の金種毎に、図３に示すように４種類の基準パターンの基準透過画像及び基準反射面画像が予め記憶してある。また、同様に、記憶部３には、紙幣の金種毎に、４種類の基準パターンの基準差分画像が予め記憶してある。 The storage unit 3 stores in advance a reference transmission image and a reference reflection surface image of four types of reference patterns as shown in FIG. Similarly, the reference difference images of four types of reference patterns are stored in advance in the storage unit 3 for each denomination of banknotes.
　また、図１に示す制御部６は、受光素子１２ｃで受光した透過光に基づき、透過画像を取得する透過画像取得部２１と、受光素子１２ｃで受光した反射光に基づき、反射面画像を取得する反射面画像取得部２２と、透過画像から反射面画像を差分した差分画像を取得する差分画像取得部２３とを有している。 Further, the control unit 6 shown in FIG. 1 acquires a reflection surface image based on the transmission image acquisition unit 21 that acquires a transmission image based on the transmission light received by the light reception element 12c and the reflection light received by the light reception element 12c. And a difference image acquisition unit 23 that acquires a difference image obtained by subtracting the reflection surface image from the transmission image.
　透過画像取得部２１は、受光素子１２ｃで受光した透過光に基づき、紙幣の表及び裏を透過した透過画像を取得する。 The transmission image acquisition unit 21 acquires a transmission image transmitted through the front and back of the banknote based on the transmitted light received by the light receiving element 12c.
　反射面画像取得部２２は、受光素子１２ｃで受光した反射光に基づき、紙幣の表又は裏の反射面画像を取得する。 The reflection surface image acquisition part 22 acquires the reflection surface image of the front or back of a banknote based on the reflected light received with the light receiving element 12c.
　差分画像取得部２３は、透過画像から、後述する補正係数αを乗じた反射面画像を差分することにより、紙幣面の特徴が含まれる差分画像を取得するものである。ここで、差分画像は、差分画像面の特徴を含む画像情報である。可視センサの場合でも、得られる画像は、紙幣の可視画像と必ずしも一致するものではない。 The difference image acquisition part 23 acquires the difference image in which the characteristic of a banknote surface is contained by subtracting the reflective surface image which multiplied the correction coefficient (alpha) mentioned later from a transmission image. Here, the difference image is image information including features of the difference image plane. Even in the case of a visible sensor, the obtained image does not necessarily match the visible image of a banknote.
　また、図１に示す制御部６は、メカ機構１３を制御するメカ機構制御部２４と、紙幣の金種を判定する金種判定部２５と、紙幣の真偽を判定する真偽判定部２６と、紙幣の汚損を判定する汚損判定部２７と、画像情報を補正する補正係数αを算出する補正係数算出部２８と、補正係数αを設定する補正係数設定部２９と、算出した補正係数αを保持する補正係数メモリ３０とを有している。 Moreover, the control part 6 shown in FIG. 1 has the mechanical mechanism control part 24 which controls the mechanical mechanism 13, the denomination determination part 25 which determines the denomination of a banknote, and the authenticity determination part 26 which determines the authenticity of a banknote. A fouling determination unit 27 that determines the fouling of banknotes, a correction coefficient calculation unit 28 that calculates a correction coefficient α for correcting image information, a correction coefficient setting unit 29 that sets the correction coefficient α, and a calculated correction coefficient α. And a correction coefficient memory 30 for holding.
　メカ機構制御部２４は、操作部４の操作開始ボタンのボタン操作を検出すると、メカ機構１３の駆動を開始し、操作停止ボタンのボタン操作を検出すると、メカ機構１３の駆動を停止するものである。 The mechanical mechanism control unit 24 starts driving the mechanical mechanism 13 when detecting the button operation of the operation start button of the operation unit 4, and stops driving the mechanical mechanism 13 when detecting the button operation of the operation stop button. is there.
　メカ機構制御部２４は、メカ機構１３を駆動中に、例えば、搬送路上で紙幣詰まりを検出すると、メカ機構１３の駆動を停止するものである。 The mechanical mechanism control unit 24 stops driving of the mechanical mechanism 13 when, for example, a paper jam is detected on the conveyance path while the mechanical mechanism 13 is being driven.
　金種判定部２５は、反射面画像取得部２２で取得した反射面画像と記憶部３に記憶中の基準反射面画像との比較照合し、合致した基準反射面画像と併せて記憶部３に記憶中の金種情報に基づき、金種の判定を行うものである。 The denomination determining unit 25 compares and compares the reflection surface image acquired by the reflection surface image acquisition unit 22 with the reference reflection surface image stored in the storage unit 3, and stores it in the storage unit 3 together with the matched reference reflection surface image. The denomination is determined based on the denomination information stored.
　また、金種判定部２５は、差分画像取得部２３で取得した差分画像と記憶部３に記憶中の基準差分画像との比較照合し、合致した基準差分画像と併せて記憶部３に記憶中の金種情報に基づき、金種の判定を行うものである。 Further, the denomination determining unit 25 compares and compares the difference image acquired by the difference image acquiring unit 23 with the reference difference image stored in the storage unit 3 and is stored in the storage unit 3 together with the matched reference difference image. The denomination is determined based on the denomination information.
　真偽判定部２６は、透過画像取得部２１で取得した透過画像及び反射面画像取得部２２で取得した反射面画像に基づき、紙幣が真券であるか否かの判定を行うものである。 The authenticity determination unit 26 determines whether the banknote is a genuine note based on the transmission image acquired by the transmission image acquisition unit 21 and the reflection surface image acquired by the reflection surface image acquisition unit 22.
　汚損判定部２７は、紙幣の表裏を特定する表裏特定部２７ａと、紙幣の表裏の汚損を判定する表裏汚損判定部２７ｂと、汚損判定する際に使用する汚損割合閾値を記憶する汚損割合閾値メモリ２７ｃとを有している。 The stain determination unit 27 includes a front / back identification unit 27a that identifies the front and back of a banknote, a front / back stain determination unit 27b that determines the front / back stain of a banknote, and a stain ratio threshold memory that stores a stain ratio threshold value used when determining the stain. 27c.
　表裏特定部２７ａは、反射面画像取得部２２で取得した反射面画像と、記憶部３に記憶中の各金種の基準反射面画像とを比較照合し、例えば、反射面画像が表の基準反射面画像と合致した場合、その反射面画像を“表”と特定し、反射面画像が裏の基準反射面画像と合致した場合、その反射面画像を“裏”と特定するものである。 The front / back identification unit 27a compares and collates the reflection surface image acquired by the reflection surface image acquisition unit 22 with the reference reflection surface image of each denomination stored in the storage unit 3, and for example, the reflection surface image is the front reference. When the reflection surface image matches the reflection surface image, the reflection surface image is specified as “front”, and when the reflection surface image matches the back reference reflection surface image, the reflection surface image is specified as “back”.
　表裏汚損判定部２７ｂは、反射面画像と記憶部３に記憶中の基準反射面画像とを比較照合することで反射面画像に含まれる汚損を検出するものである。また、表裏汚損判定部２７ｂは、差分画像取得部２３で取得した差分画像と、記憶部３に記憶中の紙幣の基準差分画像とを差分することにより、差分画像に含まれる汚損を検出するものである。その結果、表裏汚損判定部２７ｂは、紙幣の表及び裏の汚損有無を個別に検出できるものである。 The front / back surface contamination determination unit 27b detects contamination included in the reflection surface image by comparing and collating the reflection surface image with the reference reflection surface image stored in the storage unit 3. Moreover, the front and back stain | pollution | contamination determination part 27b detects the stain | pollution | contamination contained in a difference image by subtracting the difference image acquired in the difference image acquisition part 23, and the reference | standard difference image of the banknote currently memorize | stored in the memory | storage part 3. It is. As a result, the front / back stain determination unit 27b can individually detect the presence / absence of stain on the front and back of the banknote.
　さらに、表裏汚損判定部２７ｂは、反射面画像に含まれる汚損割合と、予め汚損割合閾値メモリ２７ｃに記憶中の汚損割合閾値とを比較すると共に、その比較結果に基づき、その反射面画像側の汚損を判定するものである。 Further, the front / back surface contamination determination unit 27b compares the contamination rate included in the reflection surface image with the contamination rate threshold value stored in advance in the contamination rate threshold memory 27c, and based on the comparison result, the reflection surface image side. It is for judging the contamination.
　また、表裏汚損判定部２７ｂは、紙幣の汚損割合が汚損割合閾値を超えた場合、その紙幣を汚損券と判断し、一方、紙幣の汚損割合が汚損割合閾値を超えなかった場合、その紙幣を正券と判断するものである。 In addition, the front / back stain determination unit 27b determines that the banknote is a stain ticket when the stain ratio of the banknote exceeds the stain ratio threshold value. On the other hand, if the stain ratio of the banknote does not exceed the stain ratio threshold value, the banknote is Judged as a genuine ticket.
　また、差分画像取得部２３では、補正係数設定部２９を通じて、補正係数メモリ３０に記憶中の補正係数αを乗じた反射面画像を透過画像から差分することにより差分画像を取得するものである。尚、補正係数αは、透過画像からほぼ完全な反射面画像を差分するための補正係数に相当するものである。 In addition, the difference image acquisition unit 23 acquires a difference image through the correction coefficient setting unit 29 by subtracting the reflection surface image multiplied by the correction coefficient α stored in the correction coefficient memory 30 from the transmission image. The correction coefficient α corresponds to a correction coefficient for subtracting a substantially complete reflection surface image from the transmission image.
　また、補正係数算出部２８は、反射面画像を補正するために、補正係数αを使用するが、その補正係数αを、透過用発光素子１２ａ及び反射用発光素子１２ｂのバラツキを補正し、透過率、反射率及び紙幣の汚損の検出値に応じて算出するものである。 In addition, the correction coefficient calculation unit 28 uses the correction coefficient α to correct the reflection surface image. The correction coefficient α is used to correct variations in the transmission light-emitting element 12a and the reflection light-emitting element 12b and transmit the correction coefficient α. It calculates according to the detection value of a rate, a reflectance, and the stain of a banknote.
　ここで、透過用発光素子１２ａから照射した光が紙幣の汚損部分で変動する透過率の違いを説明する。図４は、紙幣の汚損と透過率との関係を端的に示す説明図である。図中の５０１～５０５のそれぞれについて、水平方向にある線は、紙幣の断面図であり、垂直方向にある矢印の内、上半分は、透過用発光素子１２ａから照射する光を示し、下半分は、透過光を示す。 Here, the difference in transmittance in which the light irradiated from the light-emitting element 12a for transmission fluctuates at the soiled portion of the bill will be described. FIG. 4 is an explanatory view briefly showing the relationship between the bill defacement and the transmittance. For each of 501 to 505 in the figure, the horizontal line is a cross-sectional view of a banknote, and among the arrows in the vertical direction, the upper half indicates the light emitted from the transmissive light emitting element 12a, and the lower half Indicates transmitted light.
　まず、図４に示すように、紙幣の表裏に汚損がない状態５０１では、紙幣の厚み、表裏のインクの状態及び紙質等の違いから、透過用発光素子１２ａから照射した光の透過率は変動する。 First, as shown in FIG. 4, in the state 501 where there is no fouling on the front and back of the banknote, the transmittance of the light irradiated from the light emitting element 12a for transmission fluctuates due to differences in the thickness of the banknote, the state of ink on the front and back, paper quality, and the like. To do.
　また、紙幣の表に汚損がある状態５０２及び紙幣の裏に汚損がある状態５０３では、表裏に汚損がない状態５０１と比較して、遮光される割合が増えるため透過率及び透過光量が低くなる。 Also, in the state 502 where the front side of the banknote is stained and the state 503 where the back side of the banknote is stained, the transmittance and the amount of transmitted light are lower compared to the state 501 where the front and back sides are not stained. .
　また、紙幣の表裏に特に酷い汚損がある状態５０４では、さらに透過率及び透過光量は低くなる。逆に、油汚れ等の汚損が紙幣にある状態５０５では、透過率及び透過光量は前述の４つの状態５０１～５０４よりも高くなる。 Further, in the state 504 where the banknotes are particularly severely stained, the transmittance and the amount of transmitted light are further reduced. On the contrary, in the state 505 in which the banknote is contaminated with oil stains or the like, the transmittance and the amount of transmitted light are higher than those in the four states 501 to 504 described above.
　また、反射用発光素子１２ｂから照射した光の反射率や反射光量についても、各紙幣面にある汚損やインクの状態等の違いによって変動する。例えば、白色のインクや蛍光の汚損が紙幣にある場合、その汚損部分を反射する反射光の反射率は高くなる。このように、透過率、透過光量や反射率等は、紙幣の状態に応じて変動することがわかる。 Also, the reflectance and the amount of reflected light emitted from the light emitting element 12b for reflection also vary depending on differences in stains and ink states on each banknote surface. For example, when white paper or fluorescent stains are present on the banknote, the reflectance of the reflected light that reflects the contaminated portion increases. Thus, it turns out that a transmittance | permeability, a transmitted light amount, a reflectance, etc. change according to the state of a banknote.
　そこで、このような変動を考慮し、補正係数算出部２８は、透過用発光素子１２ａから、紙幣の厚み、表裏のインクの状態及び紙質等の紙幣の状態に応じて変動する透過率を取得すると共に、反射用発光素子１２ｂから紙幣の状態に応じて変動する反射率を取得し、更に、汚損判定部２７にて紙幣の汚損を検出し、これら透過率、反射率及び汚損検出値に基づき、反射面画像の補正を行うための補正係数αを算出するようにしたものである。 Therefore, in consideration of such fluctuations, the correction coefficient calculation unit 28 acquires, from the transmissive light emitting element 12a, a transmittance that varies according to the banknote state such as the banknote thickness, the front and back ink states, and the paper quality. At the same time, the reflectance that fluctuates according to the state of the bill is obtained from the reflective light emitting element 12b, and further, the stain judgment unit 27 detects the stain of the bill, and based on these transmittance, reflectance, and stain detection value, The correction coefficient α for correcting the reflection surface image is calculated.
　補正係数算出部２８は、透過画像、反射面画像や差分画像内の画素単位毎に補正係数αを算出し、反射面画像に補正係数αを乗ずることで反射面画像を補正し、より高精度な差分画像を取得できるようにしたものである。 The correction coefficient calculation unit 28 calculates a correction coefficient α for each pixel unit in the transmission image, the reflection surface image, and the difference image, and corrects the reflection surface image by multiplying the reflection surface image by the correction coefficient α, thereby achieving higher accuracy. This makes it possible to acquire a difference image.
　補正係数設定部２９は、補正係数算出部２８で算出した補正係数αを取得するものである。また、補正係数設定部２９は、表裏特定部２７ａにて、反射面画像の表裏を特定できなかった場合に、基準反射面画像を特定できていないため、透過率、反射率及び紙幣の汚損を検出することができない。そこで、補正係数設定部２９は、予め記憶部３に記憶した補正係数を、補正係数αとして差分画像取得部２３に設定するものである。 The correction coefficient setting unit 29 acquires the correction coefficient α calculated by the correction coefficient calculation unit 28. In addition, the correction coefficient setting unit 29 cannot specify the reference reflection surface image when the front and back identification unit 27a cannot identify the front and back of the reflection surface image. It cannot be detected. Therefore, the correction coefficient setting unit 29 sets the correction coefficient stored in advance in the storage unit 3 in the difference image acquisition unit 23 as the correction coefficient α.
　補正係数メモリ３０は、例えば、フラッシュメモリ等の不揮発性の情報記憶部材により構成しており、補正係数設定部２９が、補正係数メモリ３０に、差分画像取得部２３で行われる処理に必要な各画素に対応する補正係数αを一時的に記憶しているものである。 The correction coefficient memory 30 is composed of, for example, a non-volatile information storage member such as a flash memory, and the correction coefficient setting unit 29 adds each of the correction coefficient memory 30 necessary for processing performed by the difference image acquisition unit 23. The correction coefficient α corresponding to the pixel is temporarily stored.
　尚、本願請求項記載の紙葉類識別装置は紙幣識別装置１、透過画像取得手段は透過画像取得部２１、反射面画像取得手段は反射面画像取得部２２、差分画像取得手段は差分画像取得部２３、紙葉類識別手段は制御部６に相当するものである。 In addition, the paper sheet identification device according to the present invention is the banknote identification device 1, the transmission image acquisition unit is the transmission image acquisition unit 21, the reflection surface image acquisition unit is the reflection surface image acquisition unit 22, and the difference image acquisition unit is the difference image acquisition. The unit 23 and the paper sheet identification means correspond to the control unit 6.
　また、本願請求項記載の透過光照射手段は透過用発光素子１２ａ、反射光照射手段は反射用発光素子１２ｂ、受光手段は受光素子１２ｃ、補正係数設定手段は補正係数設定部２９、補正係数設定変更手段は補正係数算出部２８に相当するものである。 Further, the transmitted light irradiating means described in the claims of the present application is the transmitting light emitting element 12a, the reflected light irradiating means is the reflecting light emitting element 12b, the light receiving means is the light receiving element 12c, the correction coefficient setting means is the correction coefficient setting unit 29, and the correction coefficient setting. The changing means corresponds to the correction coefficient calculation unit 28.
　さらに、本願請求項記載の紙葉類種別特定手段は金種判定部２５、真偽判定手段は真偽判定部２６、表裏特定手段は表裏特定部２７ａ、表裏汚損判定手段は表裏汚損判定部２７ｂに相当するものである。 Further, the paper sheet type specifying means described in the claims of this application is the denomination determining unit 25, the authenticity determining means is the authenticity determining unit 26, the front / back specifying means is the front / back specifying unit 27a, and the front / back fouling determining unit is the front / back fouling determining unit 27b. It is equivalent to.
　次に、本実施例に係る紙幣識別装置１の動作について図５及び図６を用いて説明する。図５は、紙幣識別装置１の紙幣識別処理に関わる制御部６内部の処理動作を示すフローチャートである。図６は紙幣識別装置１の動作概要を端的に示す説明図である。 Next, the operation of the banknote recognition apparatus 1 according to the present embodiment will be described with reference to FIGS. FIG. 5 is a flowchart showing the processing operation inside the control unit 6 related to the banknote recognition process of the banknote recognition apparatus 1. FIG. 6 is an explanatory view briefly showing an operation outline of the banknote recognition apparatus 1.
　図５において、制御部６内の透過画像取得部２１は、紙幣識別装置１に紙幣が投入されると、受光素子１２ｃで受光した透過光に基づき、透過画像３０５を取得する（ステップＳ１０１）。この場合、透過画像取得部２１は、図６に示すような、紙幣の表３０１に汚損３０２、裏３０３に汚損３０４がある紙幣を想定すると、透過画像３０５を取得することになる。 5, when a bill is inserted into the bill recognition device 1, the transmission image acquisition unit 21 in the control unit 6 acquires a transmission image 305 based on the transmitted light received by the light receiving element 12c (step S101). In this case, the transmission image acquisition unit 21 acquires the transmission image 305 assuming a banknote having a stain 302 on the front side 301 and a stain 304 on the back 303 as shown in FIG.
　また、反射面画像取得部２２は、受光素子１２ｃで受光した反射光に基づき、反射面画像３０６を取得する（ステップＳ１０２）。この場合、反射面画像取得部２２は、図６に示すような、紙幣の裏の汚損３０４を含む、反射面画像３０６を取得することになる。 Further, the reflection surface image acquisition unit 22 acquires the reflection surface image 306 based on the reflected light received by the light receiving element 12c (step S102). In this case, the reflection surface image acquisition unit 22 acquires the reflection surface image 306 including the stain 304 on the back of the banknote as shown in FIG.
　制御部６内の汚損判定部２７内部の表裏特定部２７ａは、反射面画像が、裏であるか否かを判定する（ステップＳ１０３）。尚、表裏特定部２７ａは、反射面画像と、記憶部３に記憶中の基準反射面画像とを比較照合し、例えば、反射面画像が表の基準反射面画像と合致した場合、反射面画像は表と特定する。また、反射面画像が裏の基準反射面画像と合致した場合、反射面画像は裏と特定するものである。 The front / back specifying unit 27a in the stain determination unit 27 in the control unit 6 determines whether or not the reflection surface image is the back side (step S103). The front / back specifying unit 27a compares and collates the reflection surface image with the reference reflection surface image stored in the storage unit 3. For example, when the reflection surface image matches the reference reflection surface image of the front, the reflection surface image Is identified as a table. When the reflective surface image matches the reference reflective surface image on the back side, the reflective surface image is identified as the back side.
　金種判定部２５は、ステップＳ１０２で取得した反射面画像が“裏”と特定した場合（ステップＳ１０３：Ｙｅｓ）、ステップＳ１０３で合致した裏の基準反射面画像に基づき、金種を判定する（ステップＳ１０４）。尚、金種判定部２５は、ステップＳ１０３で合致した裏の基準反射面画像と併せて記憶部３に記憶中の金種情報に基づき、金種を特定することになる。 When the reflective surface image acquired in step S102 specifies “back” (step S103: Yes), the denomination determining unit 25 determines the denomination based on the back reference reflective surface image matched in step S103 ( Step S104). The denomination determining unit 25 specifies the denomination based on the denomination information stored in the storage unit 3 together with the back reference reflection surface image matched in step S103.
　真偽判定部２６は、ステップＳ１０１で取得した透過画像、ステップＳ１０２で取得した反射面画像及びステップＳ１０４で判定した金種に基づき、紙幣が真券であるか否かを判定する（ステップＳ１０５）。 The authenticity determination unit 26 determines whether the banknote is a genuine note based on the transmission image acquired in step S101, the reflection surface image acquired in step S102, and the denomination determined in step S104 (step S105). .
　そして、汚損判定部２７内部の表裏汚損判定部２７ｂは、ステップＳ１０２で取得した反射面画像と、ステップＳ１０３で合致した裏の基準反射面画像とを差分することにより、ステップＳ１０２で取得した反射面画像の汚損を検出する（ステップＳ１０６）。尚、表裏汚損判定部２７ｂは図６に示すように、反射面画像３０６から汚損３０４を検出することになる。 Then, the front / back fouling determination unit 27b inside the fouling determination unit 27 calculates the difference between the reflection surface image acquired in step S102 and the back reference reflection surface image matched in step S103, thereby acquiring the reflection surface acquired in step S102. Image fouling is detected (step S106). Note that the front / back stain determination unit 27b detects the stain 304 from the reflection surface image 306 as shown in FIG.
　また、補正係数算出部２８は、受光素子１２ｃで受光した透過率、反射率及び表裏汚損判定部２７ｂで検出した紙幣の汚損の検出値に基づき、ステップＳ１０２で取得した反射面画像の補正を行うための補正係数αを画素毎に算出する（ステップＳ１０７）。 Further, the correction coefficient calculation unit 28 corrects the reflection surface image acquired in step S102 based on the transmittance and reflectance received by the light receiving element 12c and the detected value of banknote stain detected by the front / back stain determination unit 27b. The correction coefficient α for this is calculated for each pixel (step S107).
　さらに、差分画像取得部２３は、各画素について、ステップＳ１０１で取得した透過画像から、ステップＳ１０７で算出した補正係数αを乗じた反射面画像を差分することにより、紙幣の表の特徴及び紙幣の表の汚損を含む差分画像を取得する（ステップＳ１０８）。尚、差分画像取得部２３は、図６に示すように、透過画像３０５から、補正係数α３０７を乗じた反射面画像３０６を差分することにより、差分画像３０８を取得することになる。 Further, for each pixel, the difference image acquisition unit 23 calculates the difference between the reflection surface image multiplied by the correction coefficient α calculated in step S107 from the transmission image acquired in step S101, and the characteristics of the banknote table and the banknotes. A difference image including the stain on the table is acquired (step S108). The difference image acquisition unit 23 acquires the difference image 308 by subtracting the reflection surface image 306 multiplied by the correction coefficient α307 from the transmission image 305 as shown in FIG.
　表裏汚損判定部２７ｂは、ステップＳ１０８で取得した差分画像と、ステップＳ１０４で特定した金種の表の基準差分画像とを差分することにより、ステップＳ１０８で取得した差分画像の汚損を検出する（ステップＳ１０９）。尚、表裏汚損判定部２７ｂは、図６に示すように、紙幣の表の汚損３０２を検出することになる。 The front / back stain determination unit 27b detects the stain of the difference image acquired in step S108 by subtracting the difference image acquired in step S108 from the reference difference image of the denomination table specified in step S104 (step S108). S109). The front / back stain determination unit 27b detects the front / back stain 302 of the banknote as shown in FIG.
　表裏汚損判定部２７ｂは、反射面画像の汚損の割合が汚損割合閾値メモリ２７ｃに記憶中の汚損割合閾値を超えたか否かを判定する（ステップＳ１１０）。表裏汚損判定部２７ｂは、汚損の割合が汚損割合閾値を超えた場合（ステップＳ１１０：Ｙｅｓ）、この紙幣を汚損券と判断して（ステップＳ１１１）、その旨を表示部５に表示し、図５に示す処理動作を終了する。尚、ユーザは、表示部５の表示内容に基づき、同紙幣が汚損券と認識することができる。 The front / back surface contamination determination unit 27b determines whether the contamination rate of the reflection surface image exceeds the contamination rate threshold stored in the contamination rate threshold memory 27c (step S110). When the stain ratio exceeds the stain ratio threshold value (step S110: Yes), the front / back stain determination unit 27b determines that the banknote is a stain ticket (step S111), and displays that fact on the display unit 5, as shown in FIG. The processing operation shown in FIG. Note that the user can recognize the banknote as a fouled ticket based on the display content of the display unit 5.
　また、表裏汚損判定部２７ｂは、反射面画像の汚損の割合が汚損割合閾値を超えない場合（ステップＳ１１０：Ｎｏ）、差分画像の汚損の割合が汚損割合閾値を超えたか否かを判定する（ステップＳ１１２）。表裏汚損判定部２７ｂは、汚損の割合が汚損割合閾値を超えた場合（ステップＳ１１２：Ｙｅｓ）、この紙幣を汚損券と判断して（ステップＳ１１１）、その旨を表示部５に表示し、図５に示す処理動作を終了する。 Moreover, the front and back stain | pollution | contamination determination part 27b determines whether the stain | pollution | contamination ratio of the difference image exceeded the stain | pollution | contamination ratio threshold value, when the stain | pollution | contamination ratio of a reflective surface image does not exceed the stain | pollution | contamination ratio threshold value (step S110: No). Step S112). When the stain ratio exceeds the stain ratio threshold value (step S112: Yes), the front / back stain determination unit 27b determines that the banknote is a stain ticket (step S111), and displays that fact on the display unit 5, as shown in FIG. The processing operation shown in FIG.
　また、表裏汚損判定部２７ｂは、差分画像の汚損の割合が汚損割合閾値を超えない場合（ステップＳ１１２：Ｎｏ）、使用可能な正常な紙幣、すなわち真券と判断し、図５に示す処理動作を終了する。 Moreover, the front and back stain | pollution | contamination determination part 27b judges that it is a normal banknote which can be used, ie, a genuine note, when the ratio of the contamination of a difference image does not exceed a contamination ratio threshold value (step S112: No), and processing operation shown in FIG. Exit.
　また、表裏特定部２７ａは、ステップＳ１０３にて反射面画像が“裏”ではない、すなわち“表”と特定した場合（ステップＳ１０３：Ｎｏ）、反射面画像が、金種判定が可能であるか否かを判定する（ステップＳ１１３）。表裏特定部２７ａは、金種判定が可能と判断した場合（ステップＳ１１３：Ｙｅｓ）、反射面画像に金種を特定する特徴が含まれているものと判断し、ステップＳ１０４の処理動作へ移行する。 Further, when the front and back specifying unit 27a specifies that the reflection surface image is not “back” in step S103, that is, “front” (step S103: No), is it possible to determine the denomination of the reflection surface image? It is determined whether or not (step S113). When it is determined that the denomination determination is possible (step S113: Yes), the front / back specifying unit 27a determines that the characteristic that specifies the denomination is included in the reflection surface image, and proceeds to the processing operation of step S104. .
　例えば、アメリカドル紙幣のように、紙幣の片面にしか特徴が含まれないような紙幣の場合、ステップＳ１０２で取得した反射面画像に特徴が含まれていたら、反射面画像に基づき、金種判定が可能であるが、反射面画像に特徴が含まれていなかったら、反射面画像に基づき、金種判定することができない。 For example, in the case of a bill that includes a feature only on one side of the bill, such as a US dollar bill, if the feature is included in the reflection surface image acquired in step S102, the denomination is determined based on the reflection surface image. However, if no feature is included in the reflection surface image, the denomination cannot be determined based on the reflection surface image.
　そこで、表裏特定部２７ａは、ステップＳ１０２で取得した反射面画像の金種判定が不可能と判断した場合（ステップＳ１１３：Ｎｏ）、補正係数設定部２９にて予め記憶部３に記憶した補正係数を、補正係数αとして画素毎に設定する（ステップＳ１１４）。 Therefore, when it is determined that the denomination determination of the reflection surface image acquired in step S102 is impossible (step S113: No), the front / back specifying unit 27a stores the correction coefficient stored in the storage unit 3 in advance by the correction coefficient setting unit 29. Is set for each pixel as the correction coefficient α (step S114).
　差分画像取得部２３は、各画素について、ステップＳ１０１で取得した透過画像から、ステップＳ１１４で設定した補正係数αを乗じた反射面画像を差分することにより、紙幣の裏の差分画像を取得する（ステップＳ１１５）。 The difference image acquisition unit 23 acquires, for each pixel, the difference image on the reverse side of the banknote by subtracting the reflection surface image multiplied by the correction coefficient α set in step S114 from the transmission image acquired in step S101 ( Step S115).
　金種判定部２５は、裏の差分画像と、記憶部３に記憶中の裏の基準差分画像とを比較照合し、合致した裏の基準差分画像と併せて記憶部３に記憶中の金種情報に基づき、金種を特定することになる（ステップＳ１１６）。 The denomination determining unit 25 compares the back difference image with the back reference difference image stored in the storage unit 3, and stores the denomination stored in the storage unit 3 together with the matched back reference difference image. Based on the information, the denomination is specified (step S116).
　真偽判定部２６は、ステップＳ１０１で取得した透過画像、ステップＳ１０２で取得した反射面画像及びステップＳ１１６で判定した金種に基づき、紙幣が真券であるか否かを判定する（ステップＳ１１７）。 The authenticity determination unit 26 determines whether the bill is a genuine note based on the transmission image acquired in step S101, the reflection surface image acquired in step S102, and the denomination determined in step S116 (step S117). .
　さらに、表裏汚損判定部２７ｂは、ステップＳ１０２で取得した反射面画像と、記憶部３に記憶中の基準反射面画像とを差分することにより、反射面画像の汚損を検出し（ステップＳ１１８）、差分画像とステップＳ１１６で特定した基準差分画像とを差分により取得した差分画像の汚損を検出すべく、ステップＳ１０９へ移行する。 Further, the front / back surface contamination determination unit 27b detects the contamination of the reflection surface image by subtracting the reflection surface image acquired in step S102 from the reference reflection surface image stored in the storage unit 3 (step S118). In order to detect the contamination of the difference image obtained by the difference between the difference image and the reference difference image specified in step S116, the process proceeds to step S109.
　本実施例によれば、透過画像から、補正係数αを乗じた反射面画像を差分することにより、紙幣面の特徴が含まれる差分画像を取得するようにしたので、これら透過画像、反射面画像及び差分画像に基づき、紙幣両面の内、表及び裏を個別に識別でき、例えば、アメリカドル紙幣のように片面にしか特徴が表れないような紙幣の場合でも、短時間でかつ高精度に金種を特定することができると共に、更には、紙幣の表及び裏にある汚損を個別に識別することで、高精度な汚損判定を実現することができる。 According to the present embodiment, the difference image including the feature of the banknote surface is obtained by subtracting the reflection surface image multiplied by the correction coefficient α from the transmission image, so that the transmission image and the reflection surface image are obtained. Based on the difference image, the front and back sides of the banknotes can be individually identified. For example, even in the case of banknotes whose features appear only on one side, such as US dollar banknotes, the money can be quickly and accurately The seed can be specified, and furthermore, highly accurate stain determination can be realized by individually identifying the stain on the front and back of the banknote.
　また、本実施例によれば、透過用発光素子１２ａの透過光と、反射用発光素子１２ｂの反射光とを受光する受光素子１２ｃを１個で兼用するようにしたので、高価な受光素子を増設することなく、部品コストの抑制を図ることができる。 In addition, according to the present embodiment, the single light receiving element 12c that receives the transmitted light of the transmitting light emitting element 12a and the reflected light of the reflecting light emitting element 12b is used as a single unit. The cost of parts can be reduced without increasing the number of parts.
　また、本実施例によれば、予め記憶部３に記憶中の補正係数αを乗じた反射面画像を透過画像から差分することにより差分画像を取得するようにしたので、製品誤差を解消しながら、これら反射面画像、透過画像及び差分画像に基づき、紙幣両面を正確に識別することができる。 In addition, according to the present embodiment, the difference image is obtained by subtracting the reflection surface image obtained by multiplying the correction coefficient α stored in the storage unit 3 in advance from the transmission image, so that the product error is eliminated. Based on the reflection surface image, the transmission image, and the difference image, both sides of the banknote can be accurately identified.
　また、本実施例によれば、透過用発光素子１２ａから紙幣の状態に応じて変動する透過率を取得すると共に、反射用発光素子１２ｂから紙幣の状態に応じて変動する反射率を取得し、更に、汚損判定部２７にて紙幣の汚損を検出し、これら透過率、反射率及び汚損検出値に基づき、反射面画像の補正を行うための補正係数αを算出するようにしたので、より高精度な補正係数αに基づき、高精度の差分画像を取得することができる。 Moreover, according to the present Example, while acquiring the transmittance | permeability which changes according to the state of a banknote from the light emitting element 12a for transmission, the reflectance which changes according to the state of a banknote is acquired from the light emitting element 12b for reflection, Furthermore, since the stain judgment unit 27 detects the stain of the banknote and calculates the correction coefficient α for correcting the reflection surface image based on these transmittance, reflectance, and stain detection value, A highly accurate difference image can be acquired based on the accurate correction coefficient α.
　尚、上記実施例においては、各画素について補正係数αを算出し、その補正係数αを反射面画像に乗じて反射面画像を補正するようにしたが、反射面画像内の所定個数の画素を１ブロックとして、反射面画像をブロック単位で分割し、各ブロックで算出した画素に対する検出値の合計値又は平均値を用いて補正係数αを算出するようにしても良く、この場合、短時間で差分画像の取得処理を行うことができる。 In the above embodiment, the correction coefficient α is calculated for each pixel, and the reflection surface image is corrected by multiplying the correction surface α by the correction coefficient α. However, a predetermined number of pixels in the reflection surface image are obtained. As one block, the reflection surface image may be divided into blocks, and the correction coefficient α may be calculated using the total value or the average value of the detection values for the pixels calculated in each block. Difference image acquisition processing can be performed.
　また、上記実施例においては、搬送路上を通過する紙幣毎に補正係数αを算出するようにしたが、連続して通過する紙幣同士は隣接して汚れが同等のレベルにあることが多々あるため、連続して紙幣の汚損のレベルが同一の状態が継続した場合、同レベルでの紙幣の補正係数αを算出し、次の紙幣の補正係数αを算出することなく、同レベルで算出した補正係数αを順次設定するようにしても良く、この場合、補正係数αを算出する負担を大幅に軽減することができる。 Moreover, in the said Example, although correction coefficient (alpha) was calculated for every banknote which passes on a conveyance path, since the banknotes which pass continuously are adjacent and there are many levels of dirt, they are in many cases. When the state where the level of banknote defacement continues is the same, the correction coefficient α of the banknote at the same level is calculated, and the correction calculated at the same level without calculating the correction coefficient α of the next banknote The coefficient α may be set sequentially. In this case, the burden of calculating the correction coefficient α can be greatly reduced.
　また、上記実施例においては、反射面画像に基づき、金種を判定するようにしたが、透過画像に基づき、金種を判定するようにしても良く、更に、透過画像及び反射面画像に基づき、金種を判定するようにしても良く、この場合、高精度に金種を判定することができる。 In the above embodiment, the denomination is determined based on the reflection surface image. However, the denomination may be determined based on the transmission image, and based on the transmission image and the reflection surface image. The denomination may be determined. In this case, the denomination can be determined with high accuracy.
　また、上記実施例においては、紙幣を識別する紙幣識別装置１を例に挙げて説明したが、紙幣以外の小切手、手形や商品券等、他の任意の紙葉類についても適用可能であることは言うまでもない。 Moreover, in the said Example, although demonstrated taking the case of the banknote identification device 1 which identifies a banknote, it can apply also to other arbitrary paper sheets, such as a check other than a banknote, a bill, and a gift certificate. Needless to say.

Claims (10)

  1. 　紙葉類を透過して透過画像を取得する透過画像取得手段と、
    　前記紙葉類片面の反射面画像を取得する反射面画像取得手段と、
    　前記透過画像取得手段にて取得した前記紙葉類の前記透過画像から前記反射面画像取得手段にて取得した前記紙葉類片面の反射面画像を差分した差分画像を取得する差分画像取得手段と、
    　前記紙葉類の前記透過画像、前記反射面画像及び前記差分画像に基づき、前記紙葉類を識別する紙葉類識別手段と、
    を有することを特徴とする紙葉類識別装置。     A transmission image acquisition means for acquiring a transmission image through a paper sheet;
    Reflection surface image acquisition means for acquiring a reflection surface image of one side of the paper sheet;
    Difference image acquisition means for acquiring a difference image obtained by subtracting the reflection surface image of one side of the paper sheet acquired by the reflection surface image acquisition means from the transmission image of the paper sheet acquired by the transmission image acquisition means; ,
    A paper sheet identifying means for identifying the paper sheet based on the transmission image, the reflection surface image, and the difference image of the paper sheet;
    A paper sheet identification device comprising:
  2. 　前記紙葉類を透過する透過光を前記紙葉類に照射する透過光照射手段と、
    　前記紙葉類片面に光を照射する反射光照射手段と、
    　前記透過光照射手段にて照射した前記透過光を受光すると共に、前記反射光照射手段にて照射した光の反射光を受光する受光手段とを有し、
    　前記透過画像取得手段は、
    　前記受光手段にて前記透過光を受光して前記紙葉類の透過画像を取得し、
    　前記反射面画像取得手段は、
    　前記受光手段にて前記反射光を受光して前記紙葉類の反射面画像を取得することを特徴とする請求項１記載の紙葉類識別装置。     Transmitted light irradiating means for irradiating the paper with transmitted light that passes through the paper; and
    Reflected light irradiating means for irradiating light on one side of the paper sheet;
    Receiving the transmitted light irradiated by the transmitted light irradiation means, and receiving the reflected light of the light irradiated by the reflected light irradiation means,
    The transparent image acquisition means includes
    Receiving the transmitted light by the light receiving means to obtain a transmission image of the paper sheet,
    The reflecting surface image acquisition means includes
    The paper sheet identification apparatus according to claim 1, wherein the light receiving unit receives the reflected light to acquire a reflection surface image of the paper sheet.
  3. 　前記透過画像から前記反射面画像が高精度に差分できるように前記差分画像取得手段の補正係数を設定する補正係数設定手段を有することを特徴とする請求項１又は２記載の紙葉類識別装置。 The paper sheet identification apparatus according to claim 1, further comprising a correction coefficient setting unit that sets a correction coefficient of the difference image acquisition unit so that the reflection surface image can be accurately differentiated from the transmission image. .
  4. 　前記透過画像取得手段にて取得した前記透過画像及び前記反射面画像取得手段にて取得した前記反射面画像に基づき、前記補正係数設定手段にて設定した前記補正係数を変更可能にする補正係数設定変更手段を有することを特徴とする請求項３記載の紙葉類識別装置。 Correction coefficient setting for changing the correction coefficient set by the correction coefficient setting unit based on the transmission image acquired by the transmission image acquisition unit and the reflection surface image acquired by the reflection surface image acquisition unit 4. The paper sheet identification apparatus according to claim 3, further comprising a changing unit.
  5. 　前記紙葉類識別手段は、
    　前記透過画像及び／又は前記反射面画像に基づき、前記紙葉類の種別を特定できたか否かを判定し、前記透過画像及び／又は前記反射面画像に基づき、前記紙葉類の種別を特定できなかった場合、前記差分画像に基づき、前記紙葉類の種別を特定する紙葉類種別特定手段を有することを特徴とする請求項１又は２記載の紙葉類識別装置。     The paper sheet identifying means includes
    It is determined whether or not the type of the paper sheet can be specified based on the transmission image and / or the reflection surface image, and the type of the paper sheet is specified based on the transmission image and / or the reflection surface image. 3. The paper sheet identification device according to claim 1, further comprising: a paper sheet type specifying unit configured to specify the type of the paper sheet based on the difference image when it cannot be performed. 4.
  6. 　前記紙葉類識別手段は、
    　前記透過画像及び前記反射面画像に基づき、前記紙葉類の真偽を判定する真偽判定手段を有することを特徴とする請求項１又は２記載の紙葉類識別装置。     The paper sheet identifying means includes
    The paper sheet identification apparatus according to claim 1, further comprising: a true / false determination unit configured to determine the authenticity of the paper sheet based on the transmission image and the reflection surface image.
  7. 　前記紙葉類識別手段は、
    　前記反射面画像に基づき、前記紙葉類の一方片面側の汚損有無を判定すると共に、前記差分画像に基づき、前記紙葉類の他方片面側の汚損有無を判定する汚損判定手段を有することを特徴とする請求項１又は２記載の紙葉類識別装置。     The paper sheet identifying means includes
    The present invention has a stain determination means for determining the presence / absence of contamination on one side of the paper sheet based on the reflection surface image and determining the presence / absence of contamination on the other side of the paper sheet based on the difference image. The paper sheet identification apparatus according to claim 1 or 2, characterized in that:
  8. 　前記汚損判定手段は、
    　前記反射面画像に基づき、前記一方片面側を前記紙葉類の表又は裏として特定すると共に、この特定結果に基づき、前記他方片面側を前記紙葉類の裏又は表として特定する表裏特定手段と、
    　前記表裏特定手段にて特定した紙葉類の表側の汚損有無を判定すると共に、前記紙葉類の裏側の汚損有無を判定する表裏汚損判定手段とを有することを特徴とする請求項５記載の紙葉類識別装置。     The stain determination means
    Based on the reflection surface image, the one side is specified as the front or back of the paper sheet, and the other side is specified as the back or front of the paper based on the specification result. When,
    6. The front and back surface contamination determination means for determining whether or not the paper sheet specified by the front and back surface specifying means is stained on the front side, and for determining whether the paper sheet is stained on the back side or not. Paper sheet identification device.
  9. 　紙葉類を透過して透過画像を取得する透過画像取得ステップと、
    　前記紙葉類片面の反射面画像を取得する反射面画像取得ステップと、
    　前記透過画像取得ステップにて取得した前記紙葉類の前記透過画像から前記反射面画像取得ステップにて取得した前記紙葉類片面の反射面画像を差分した差分画像を取得する差分画像取得ステップと、
    　前記紙葉類の前記透過画像、前記反射面画像及び前記差分画像に基づき、前記紙葉類を識別する紙葉類識別ステップと、
    を含むことを特徴とする紙葉類識別方法。     A transmission image acquisition step of transmitting a paper sheet and acquiring a transmission image;
    A reflection surface image acquisition step of acquiring a reflection surface image of one side of the paper sheet;
    A difference image acquisition step of acquiring a difference image obtained by subtracting the reflection surface image of one side of the paper sheet acquired in the reflection surface image acquisition step from the transmission image of the paper sheet acquired in the transmission image acquisition step; ,
    A paper sheet identification step for identifying the paper sheet based on the transmission image of the paper sheet, the reflection surface image, and the difference image;
    The paper sheet identification method characterized by including this.
  10. 　紙葉類を透過して透過画像を取得する透過画像取得手順と、
    　前記紙葉類片面の反射面画像を取得する反射面画像取得手順と、
    　前記透過画像取得手順にて取得した前記紙葉類の前記透過画像から前記反射面画像取得手順にて取得した前記紙葉類片面の反射面画像を差分した差分画像を取得する差分画像取得手順と、
    　前記紙葉類の前記透過画像、前記反射面画像及び前記差分画像に基づき、前記紙葉類を識別する紙葉類識別手順と、
    を含むプログラムをコンピュータに実行させることを特徴とする紙葉類識別プログラム。     A transmission image acquisition procedure for transmitting a paper sheet and acquiring a transmission image;
    A reflection surface image acquisition procedure for acquiring a reflection surface image of one side of the paper sheet;
    A difference image acquisition procedure for acquiring a difference image obtained by subtracting a reflection surface image of one side of the paper sheet acquired by the reflection surface image acquisition procedure from the transmission image of the paper sheet acquired by the transmission image acquisition procedure; ,
    A paper sheet identification procedure for identifying the paper sheet based on the transmission image, the reflection surface image, and the difference image of the paper sheet;
    A paper sheet identification program which causes a computer to execute a program including
PCT/JP2008/066088 2008-09-05 2008-09-05 Paper sheet discriminating device, paper sheet discriminating method, and paper sheet discriminating program WO2010026646A1 (en)

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