US20070278737A1 - Paper sheet identifying and checking apparatus - Google Patents

Paper sheet identifying and checking apparatus Download PDF

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Publication number
US20070278737A1
US20070278737A1 US11/755,777 US75577707A US2007278737A1 US 20070278737 A1 US20070278737 A1 US 20070278737A1 US 75577707 A US75577707 A US 75577707A US 2007278737 A1 US2007278737 A1 US 2007278737A1
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US
United States
Prior art keywords
paper sheet
conveying
bill
identifying
line sensor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US11/755,777
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English (en)
Inventor
Takeshi Matsuoka
Yoshihiro Takada
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Omron Terminal Solutions Corp
Original Assignee
Hitachi Omron Terminal Solutions Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hitachi Omron Terminal Solutions Corp filed Critical Hitachi Omron Terminal Solutions Corp
Assigned to HITACHI-OMRON TERMINAL SOLUTIONS, CORP. reassignment HITACHI-OMRON TERMINAL SOLUTIONS, CORP. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: MATSUOKA, TAKESHI, TAKADA, YOSHIHIRO
Publication of US20070278737A1 publication Critical patent/US20070278737A1/en
Abandoned legal-status Critical Current

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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
    • G07D11/00—Devices accepting coins; Devices accepting, dispensing, sorting or counting valuable papers
    • G07D11/20—Controlling or monitoring the operation of devices; Data handling
    • G07D11/22—Means for sensing or detection
    • G07D11/225—Means for sensing or detection for detecting or indicating tampering
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
    • G07D7/00—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency
    • G07D7/06—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency using wave or particle radiation
    • G07D7/12—Visible light, infrared or ultraviolet radiation
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
    • G07D11/00—Devices accepting coins; Devices accepting, dispensing, sorting or counting valuable papers
    • G07D11/20—Controlling or monitoring the operation of devices; Data handling
    • G07D11/22—Means for sensing or detection
    • 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
    • G07D7/17—Apparatus characterised by positioning means or by means responsive to positioning
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07F—COIN-FREED OR LIKE APPARATUS
    • G07F19/00—Complete banking systems; Coded card-freed arrangements adapted for dispensing or receiving monies or the like and posting such transactions to existing accounts, e.g. automatic teller machines
    • G07F19/20—Automatic teller machines [ATMs]
    • G07F19/201—Accessories of ATMs
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
    • G07D2207/00—Paper-money testing devices
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
    • G07D2211/00—Paper-money handling devices

Definitions

  • the present invention relates to a paper sheet identifying and checking apparatus for identifying a paper sheet, for example, a paper money (banknote) or a bill conveyed thereto, and in particular, to a paper sheet identifying and checking apparatus for producing image data of a paper sheet by use of an optical line sensor and identifying a kind and truth or falsehood of the paper sheet on the basis of the image data.
  • the bill identifying and checking device of the prior art includes an optical sensor to detect a position of a passage of a paper sheet and gradient or inclination thereof relative to a direction to convey the paper sheet.
  • the bill identifying and checking device detects the position of the passage of the paper sheet on the basis of timing of a change in an output from the optical sensor and detects the gradient of the paper sheet on the basis of a difference in time between changes in outputs from sensor elements that is generated due to the gradient of the paper sheet.
  • JP-A-8-212417 describes a device conducting the detection in which an optical line sensor almost entirely covering the width of the conveying path is installed in a direction vertical to the conveying direction in which a paper sheet is conveyed in the conveying path.
  • the device includes a rotary encoder to generate a conveyance pulse at a fixed period each time the paper sheet is slightly conveyed, a frame memory to binarize the output from the optical line sensor at timing synchronized with the conveyance pulse and to store therein the binary value resultant from the binarization, and an image processing module to digitalize the data stored in the frame memory.
  • the conveying path is scanned in a direction perpendicular to the conveyance direction at timing synchronized with the conveyance pulse to thereby store a two-dimensional binary image of the paper sheet in the frame memory.
  • the optical line sensor includes optical elements at a pitch or interval of one millimeter (mm) and the rotary encoder generates one pulse each time the paper sheet is conveyed one millimeter, there is obtained a binary image having a contour of a 1 mm by 1 mm square.
  • the device execute image processing for the binary image to resultantly calculate the position and the gradient of each edge of the paper sheet.
  • the bill identifying and checking device to identify a bill, it is quite important to detect the slight difference between a true or authorized bill and the false or counterfeit bill without fail. Therefore, it is desirable to possibly prevent the deterioration in the identifying performance due to the error described above.
  • the detection precision is improved in the conveying direction regardless of the magnitude of the gradient of the paper sheet; moreover, the detection precision is also improved when the gradient is almost zero.
  • the detection precision in the conveying direction is twice that when a rotary encoder having a conveyance pulse period of 1 mm is used.
  • a paper sheet identifying and checking apparatus including a conveying path for conveying a paper sheet, a line sensor including a plurality of sensor elements arranged on the conveying path in a string in a conveying width direction indicating a direction of width of the conveying path, and an identifying module for identifying the paper sheet on the basis of image data produced by the line sensor by reading the paper sheet.
  • the direction of arranging the sensor elements is inclined with respect to the conveying width direction of the conveying path.
  • FIG. 1 is a perspective view of a bill identifying and checking apparatus
  • FIG. 2 is a plan view of a lower unit of the bill identifying and checking apparatus
  • FIG. 3 is a block diagram showing structure of the bill identifying and checking apparatus
  • FIG. 4 is a diagram for explaining image data in a frame memory
  • FIG. 5A is a diagram for explaining a quantization error
  • FIG. 5B is a diagram for explaining a quantization error
  • FIG. 6 is a graph showing a frequency distribution of the short-edge length of a bill in the conveying direction.
  • the embodiment relates to a bill identifying and checking apparatus for conveying a bill as a paper sheet and identifying the bill.
  • Identifying the bill indicates to determine the kind of bill, for example, a new thousand-yen bill, an old thousand-yen bill, or a two-thousand-yen bill in Japan and to determine whether the bill is an authorized bill or a counterfeit bill.
  • the term “bill” implies the authorized and counterfeit bills.
  • the bill identifying and checking apparatus is incorporated in, for example, an Automatic Teller's Machine (ATM) of a financial section of a bank to identify bills.
  • ATM Automatic Teller's Machine
  • the bill identifying and checking apparatus 1 includes an upper unit 2 and a lower unit 4 installed respectively on the upper and lower sides of a conveying path 3 .
  • a light projector section 23 a of an optical line sensor 23 is arranged to almost entirely cover the width of a conveying width L, the projector section 23 a being inclined by an angle of ⁇ from the conveying direction (the vertical direction in FIG. 2 ) to the conveyance width direction (the horizontal direction in FIG. 2 ).
  • the conveyance width direction indicates a direction vertical to the conveying direction.
  • a plurality of conveying rollers 22 are disposed to convey the bill and various sensors 21 other than the line sensor 23 .
  • a light receiver section, not shown, of the optical line sensor 23 to oppose the projector section 23 a in the vertical direction. Therefore, like the projector section 23 a , the light receiver section is also disposed in an inclined state with an angle of ⁇ as described above.
  • the conveying path is a path in which the bill 6 is conveyed in a direction indicated by an arrow A.
  • the lower unit 4 is connected to various devices arranged in the ATM.
  • a gear 5 links a motor in the ATM with the conveying rollers 22 of the bill identifying and checking apparatus 1 to rotate the rollers 22 by driving force of the motor.
  • Various sensors 21 input and output signals such as waveforms according to purposes thereof.
  • the rollers 22 are rollers which rotate the bill 6 sandwiched therebetween.
  • the rollers 22 are linked via the gear 5 with the motor of the ATM to convey the bill 6 at a fixed conveying speed.
  • the optical line sensor 23 reads an image of an optical pattern.
  • FIG. 3 shows structure of the bill identifying and checking apparatus 1 in a block diagram.
  • the bill identifying and checking apparatus 1 includes conveying rollers 22 , a rotary encoder 31 , an optical line sensor 23 , an optical line sensor driver 32 , a frame memory 33 , an image processing module 34 to process images, and an identifying module 35 to identify a bill.
  • the conveying rollers 22 are disposed to convey the bill 6 sandwiched therebetween in the conveying direction.
  • Four axes are disposed in the direction vertical to the conveying direction indicated by an arrow and four rollers are attached to each axis.
  • Each conveying roller 22 is linked via the gear 5 with the motor of the ATM to convey the bill 6 at a fixed conveying speed.
  • the rotary encoder 31 is attached to one of the rotary axes of the conveying rollers 22 or to one of the conveying rollers 22 to generate a conveyance pulse at a fixed period each time the bill 6 is slightly conveyed.
  • the optical line sensor 23 includes a plurality of light projector elements arranged on the light projector section 23 a in a line with an equal interval therebetween and a light receiver element array including a plurality of light sensor elements on the light receiver section in a string or line with an equal interval therebetween.
  • the light projector elements and the light receiver element array are disposed with the conveying path 3 therebetween in a symmetric way along the vertical direction.
  • the light projector section 23 a and the light receiver section are disposed with an inclination angle of ⁇ relative to the direction vertical to the conveying direction, while they are substantially in parallel with each other in a plane including the light projector section 23 a and the light receiver section.
  • the line sensor 23 thus configured covers almost the entire width of the conveying path 3 and hence serves a function to capture a one-dimensional image of the conveying path through one image sensing operation.
  • the line sensor 23 is arranged in a direction vertical to the conveying direction.
  • the line sensor 23 is inclined by the inclination angle ⁇ .
  • the angle ⁇ is larger than a skew allowance angle indicating allowance for the skew or inclination of the bill 6 conveyed through the conveying path 3 .
  • the optical line sensor driver 32 has a function to binarize the output from the line sensor 23 at timing synchronized with the conveyance pulse of the rotary encoder 31 and to write the binary data in the frame memory 33 .
  • the driver 32 sequentially writes the one-dimensional binary data in the frame memory 33 to resultantly produces a two-dimensional binary image therein.
  • the binary image is image data of an optical pattern of substantially the overall surface of the bill.
  • the frame memory 33 has a function to hold therein the two-dimensional binary image of the bill for a fixed period of time.
  • the frame memory 33 keeps the binary image stored therein while the image processing module 342 executes its processing.
  • the image processing module 34 has a function to read the binary image of the bill from the frame memory 33 to calculate (estimate) a position and a gradient (angle of inclination) of each edge of the bill. To calculate the gradient of the bill, the processing module 34 serves as a gradient calculation unit. To calculate the position of the edge of the bill, the processing module 34 serves as an outer contour detecting unit. The positions and gradients of four edges of the bill calculated by the processing module 34 are fed to the identifying module 35 disposed in a subsequent to the processing module 34 .
  • the identifying module 35 determines the kind of the bill 6 and whether the bill 6 is an authorized bill or a counterfeit bill to thereby identify the bill 6 .
  • the bill identifying and checking apparatus 1 To determine positions of the edges of the bill, the bill identifying and checking apparatus 1 thus constructed conducts operation as below.
  • the rollers 22 convey the bill 6 .
  • the rotary encoder 31 attached to one of the axes of the conveying rollers 22 generates conveyance pulses.
  • the line sensor driver 32 binarizes the output from the line sensor 23 to produce binary data and then writes the binary data in the frame memory 33 .
  • the one-dimensional binary data is sequentially written in the frame memory 33 .
  • a two-dimensional binary image B (image data) of the bill 6 is generated in the frame memory 33 as shown in the explanatory diagram of image data of FIG. 4 .
  • the values of the coefficients a and b are obtained by applying the method of least squares to the data items.
  • the analog data is converted into digital data, and then an appropriate calculation is conducted by use of the digital data to thereby obtain the positions of the edges of the bill.
  • the unit can also be converted by multiplying the right side of expression (1) by “unit of physical coordinates/unit of frame memory coordinates”.
  • a relationship between the bill identifying and checking operation by the identifying module 35 and the positions of the edges of the bill In the operation to identify the bill 6 by the sensors 21 including the optical line sensor 23 , if there exists a particular section of the bill 6 , a relative position of the particular section is beforehand determined relative to a particular position such as a center or an angle of the bill 6 . The particular section of the bill 6 is then identified on the basis of the positions of the edges of the bill 6 actually passed through the conveying path 3 and the beforehand determined relative position. For the identified section, the line sensor 23 and the sensors 21 process features of the section to resultantly identify the bill 6 .
  • precision of the positions of the edges of the bill directly affects precision of the position of the section of the bill 6 to be identified.
  • the precision of the position of the section of the bill 6 greatly exerts influence upon precision to identify the bill 6 .
  • the lower-left corner 6 a of the bill 6 is in column 6 of conveyance pulses P of the bill 6 and the lower-right corner 6 b thereof is in column 2 of conveyance pulses P. That is, these corners are read at different points of timing of conveyance pulses. Therefore, the straight line (the lower edge of the bill 6 ) between the lower-left corner 6 a and the lower-right corner 6 b exists in the frame memory 33 in association with a plurality of conveyance pulses P. It is hence possible to prevent an event in which the lower-left corner 6 a and the lower-right corner 6 b exist on one and the same conveyance pulse P. Therefore, the position of the bill 6 can be detected with higher precision by reducing the quantization error.
  • Each pixel 40 is defined on the basis of the period of conveying pulses and the pitch of or the interval between optical elements of the line sensor 2 .
  • An outer contour of analog image 41 is an actual outer contour of the bill 6
  • a digital image 42 is an area for the bill 6 recognizable in digital processing.
  • An outer contour of digital image 43 is an outer contour of the bill 6 obtain by use of the digital image 42 .
  • the position of the bill 6 is identified at precision equal to or less than one pixel 40 determined by the period of conveying pulses and the interval between optical elements. This leads to a large error in the operation to identify the positions of the edges of the bill 6 .
  • the edges of the binary image B appear in the form of steps.
  • FIG. 6 is a graph showing a frequency distribution of the short-edge length of the bill 6 (in the conveying direction) in the bill identifying and checking apparatus 1 including the optical line sensor 23 attached in a direction vertical to the conveying direction.
  • FIG. 6 shows the frequency distribution when the bill 6 is inclined relative to the line sensor 23 with an inclination angle equal to or less than one degree and the frequency distribution when the bill 6 is inclined relative to the line sensor 23 with an inclination angle more than one degree.
  • the frequency distribution of the short-edge length is represented with a gentle slope centered on the mean value.
  • the optical line sensor 23 is beforehand disposed in the inclined state, and hence it is secured that the bill 6 is inclined with respect to the line sensor 23 to thereby improve the precision to determine the position of the bill 6 .
  • the line sensor 23 By disposing the line sensor 23 in the inclined state as above, the position and the gradient of the paper sheet can be detected in the conveying direction with high precision regardless of the magnitude of the inclination of the paper sheet. It is therefore possible to provide the bill identifying and checking apparatus 1 with higher identifying precision.
  • the binary image B can be produced such that the front edge and the rear edge of the paper sheet are represented in the shape of steps regardless of how the paper sheet, i.e., the bill 6 is skewed or inclined.
  • a low-cost high-precision bill identifying and checking apparatus 1 capable of detecting the outer contour of the bill 6 with precision less than the pixel 40 which can be sensed by the line sensor 23 .
  • disposing the line sensor in the inclined state makes it possible to lower the specifications necessary for the image data processing to a greater degree, there can be provided a low-cost bill identifying and checking apparatus 1 capable of executing processing at a higher speed.
  • the present invention is not restricted by the configuration.
  • the length of the pixel in the conveying direction may differ from that in the conveying width direction. Also in this configuration, the contour of the bill 6 can be appropriately obtained.
  • optical line sensor 23 is inclined by an angle of ⁇ with respect to the conveying width direction
  • the apparatus in which the unit of the line sensor 23 is disposed in parallel with the conveying width direction and the light projecting elements and the light receiver element array are inclined by an angle of ⁇ with respect to the conveying width direction.
  • the present invention is not restricted by the configuration described above, but there can be considered many embodiments of the present invention.
  • a paper sheet identifying and checking apparatus in which even if the inclination of the paper sheet with respect to the direction vertical to the conveying direction is almost zero, the paper sheet can be detected in the conveying direction with precision less than the period of conveyance pulses, without increasing the cost of the apparatus.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Business, Economics & Management (AREA)
  • Accounting & Taxation (AREA)
  • Finance (AREA)
  • Inspection Of Paper Currency And Valuable Securities (AREA)
US11/755,777 2006-06-02 2007-05-31 Paper sheet identifying and checking apparatus Abandoned US20070278737A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2006-154863 2006-06-02
JP2006154863A JP2007323501A (ja) 2006-06-02 2006-06-02 紙葉類識別装置

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US20070278737A1 true US20070278737A1 (en) 2007-12-06

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US11/755,777 Abandoned US20070278737A1 (en) 2006-06-02 2007-05-31 Paper sheet identifying and checking apparatus

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US (1) US20070278737A1 (fr)
EP (1) EP1862978A3 (fr)
JP (1) JP2007323501A (fr)
KR (1) KR20070115764A (fr)
CN (1) CN101082999A (fr)
TW (1) TW200807336A (fr)

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Publication number Priority date Publication date Assignee Title
CN102651152B (zh) * 2011-02-28 2013-12-11 清芝商用机器有限公司 一种用于纸币处理机的图像检测装置
CN102831694B (zh) * 2012-08-09 2015-01-14 广州广电运通金融电子股份有限公司 一种图像识别系统及图像存储控制方法
CN103093540A (zh) * 2012-09-26 2013-05-08 深圳市怡化电脑有限公司 一种纸币宽度和间距的检测方法和检测装置
JP2015095154A (ja) * 2013-11-13 2015-05-18 株式会社東芝 紙葉類処理装置
US10187542B1 (en) 2015-12-19 2019-01-22 Ripcord Inc. Integrated physical warehouse and digital document management system
CA3008480C (fr) 2015-12-19 2024-04-23 Ripcord Inc. Systemes et procedes se rapportant a l'identification de documents et d'attaches
JP2020512247A (ja) * 2017-03-21 2020-04-23 リップコード インコーポレイテッド 原稿デジタル化のための多シート処理
WO2018175631A1 (fr) 2017-03-21 2018-09-27 Ripcord Inc. Systèmes et procédés d'identification et de transfert de feuilles
CN107170107B (zh) * 2017-05-10 2019-09-20 深圳怡化电脑股份有限公司 传感器采集数据的方法、装置、设备及存储介质
CN107808444A (zh) * 2017-11-17 2018-03-16 深圳怡化电脑股份有限公司 纸币信息识别方法、装置、设备及存储介质

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US6234294B1 (en) * 1998-10-29 2001-05-22 De La Rue International Ltd Method and system for recognition of currency by denomination

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EP0080158B1 (fr) * 1981-11-20 1987-09-02 Kabushiki Kaisha Toshiba Appareil pour détecter le profil et l'état de l'alimentation d'une feuille en papier
US4984280A (en) * 1988-06-08 1991-01-08 Laurel Bank Machines Co., Ltd. Bill discriminating apparatus

Patent Citations (1)

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Publication number Priority date Publication date Assignee Title
US6234294B1 (en) * 1998-10-29 2001-05-22 De La Rue International Ltd Method and system for recognition of currency by denomination

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Publication number Publication date
EP1862978A2 (fr) 2007-12-05
EP1862978A3 (fr) 2008-08-13
TW200807336A (en) 2008-02-01
CN101082999A (zh) 2007-12-05
KR20070115764A (ko) 2007-12-06
JP2007323501A (ja) 2007-12-13

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Owner name: HITACHI-OMRON TERMINAL SOLUTIONS, CORP., JAPAN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:MATSUOKA, TAKESHI;TAKADA, YOSHIHIRO;REEL/FRAME:019702/0711

Effective date: 20070604

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