WO2010026646A1 - Dispositif de différenciation de feuille de papier, procédé de différenciation de feuille de papier et programme de différenciation de feuille de papier - Google Patents

Dispositif de différenciation de feuille de papier, procédé de différenciation de feuille de papier et programme de différenciation de feuille de papier 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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WIPO (PCT)
Prior art keywords
paper sheet
reflection surface
image
surface image
image acquisition
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PCT/JP2008/066088
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English (en)
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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Priority to PCT/JP2008/066088 priority Critical patent/WO2010026646A1/fr
Publication of WO2010026646A1 publication Critical patent/WO2010026646A1/fr

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    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
    • G07D7/00—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency
    • G07D7/06—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency using wave or particle radiation
    • G07D7/12—Visible light, infrared or ultraviolet radiation

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

Abstract

L'invention concerne un dispositif de différenciation de feuille de papier dans lequel une section d'acquisition d'image de transmission acquiert l'image transmise générée par la transmission de papier-monnaie, une section d'acquisition d'image de surface de réflexion acquiert une image de surface de réflexion de la surface du papier-monnaie, et une section d'acquisition d'image de différence acquiert l'image de différence dans laquelle l'image de surface de réflexion de la surface de celui-ci est différenciée de l'image transmise acquise du papier-monnaie et qui permet la détermination de pollution ou la spécification de type de papier-monnaie à réaliser avec une grande précision par la différenciation séparée d'une surface parmi les deux surfaces du papier-monnaie en fonction de l'image transmise du papier-monnaie acquise par la section d'acquisition d'image de transmission, l'image de surface de réflexion de celui-ci acquise par la section d'acquisition d'image de surface de réflexion, et l'image de différence de celui-ci acquise par la section d'acquisition d'image de différence.
PCT/JP2008/066088 2008-09-05 2008-09-05 Dispositif de différenciation de feuille de papier, procédé de différenciation de feuille de papier et programme de différenciation de feuille de papier WO2010026646A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/JP2008/066088 WO2010026646A1 (fr) 2008-09-05 2008-09-05 Dispositif de différenciation de feuille de papier, procédé de différenciation de feuille de papier et programme de différenciation de feuille de papier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2008/066088 WO2010026646A1 (fr) 2008-09-05 2008-09-05 Dispositif de différenciation de feuille de papier, procédé de différenciation de feuille de papier et programme de différenciation de feuille de papier

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Publication Number Publication Date
WO2010026646A1 true WO2010026646A1 (fr) 2010-03-11

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104992494A (zh) * 2015-05-14 2015-10-21 深圳怡化电脑股份有限公司 一种纸币真伪的检测方法及装置
CN106780964A (zh) * 2016-12-06 2017-05-31 深圳怡化电脑股份有限公司 一种矫正纸币图像的方法及装置
CN107615302A (zh) * 2015-03-03 2018-01-19 迪堡多富公司 从纸张中读取预定义的文本数据

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60117390A (ja) * 1983-11-30 1985-06-24 富士通株式会社 紙葉類弁別方法
JPH0378098A (ja) * 1989-08-22 1991-04-03 Toshiba Corp 紙葉類の検査装置
JPH04307694A (ja) * 1991-04-04 1992-10-29 Oki Electric Ind Co Ltd 紙葉類判別装置
JP2004326624A (ja) * 2003-04-25 2004-11-18 Aruze Corp 識別センサ

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60117390A (ja) * 1983-11-30 1985-06-24 富士通株式会社 紙葉類弁別方法
JPH0378098A (ja) * 1989-08-22 1991-04-03 Toshiba Corp 紙葉類の検査装置
JPH04307694A (ja) * 1991-04-04 1992-10-29 Oki Electric Ind Co Ltd 紙葉類判別装置
JP2004326624A (ja) * 2003-04-25 2004-11-18 Aruze Corp 識別センサ

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107615302A (zh) * 2015-03-03 2018-01-19 迪堡多富公司 从纸张中读取预定义的文本数据
EP3266005A4 (fr) * 2015-03-03 2018-10-31 Diebold Nixdorf, Incorporated Lecture de données textuelles prédéfinies sur une feuille
CN104992494A (zh) * 2015-05-14 2015-10-21 深圳怡化电脑股份有限公司 一种纸币真伪的检测方法及装置
CN106780964A (zh) * 2016-12-06 2017-05-31 深圳怡化电脑股份有限公司 一种矫正纸币图像的方法及装置

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