WO2012051925A1 - 纸币重张的检测方法及装置、自助终端 - Google Patents

纸币重张的检测方法及装置、自助终端 Download PDF

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Publication number
WO2012051925A1
WO2012051925A1 PCT/CN2011/080858 CN2011080858W WO2012051925A1 WO 2012051925 A1 WO2012051925 A1 WO 2012051925A1 CN 2011080858 W CN2011080858 W CN 2011080858W WO 2012051925 A1 WO2012051925 A1 WO 2012051925A1
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Prior art keywords
banknote
tested
data
size
predetermined condition
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PCT/CN2011/080858
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English (en)
French (fr)
Inventor
陶鹏
许春凯
王春涛
徐伟伟
Original Assignee
山东新北洋信息技术股份有限公司
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Application filed by 山东新北洋信息技术股份有限公司 filed Critical 山东新北洋信息技术股份有限公司
Priority to EP11833831.8A priority Critical patent/EP2631881A4/en
Publication of WO2012051925A1 publication Critical patent/WO2012051925A1/zh

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Classifications

    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
    • G07D7/00—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency
    • G07D7/04—Testing magnetic properties of the materials thereof, e.g. by detection of magnetic imprint
    • 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
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
    • G07D7/00—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency
    • G07D7/06—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency using wave or particle radiation
    • G07D7/12—Visible light, infrared or ultraviolet radiation
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
    • G07D7/00—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency
    • G07D7/16—Testing the dimensions
    • 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
    • G07D7/181—Testing mechanical properties or condition, e.g. wear or tear
    • G07D7/183—Detecting folds or doubles
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
    • G07D7/00—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency
    • G07D7/20—Testing patterns thereon

Definitions

  • the present invention relates to the field of banknote detection, and more particularly to a method and apparatus for detecting banknote re-drawing, and a self-service terminal.
  • Background Art In a cash transaction device (self-service terminal), banknotes are continuously received, in particular, an automatic teller machine (ATM) for banking, and a ticket vending machine (TVM) for a railway system, in which various banknotes need to be identified. Due to the different surface conditions of the banknotes and the influence of climatic conditions, it is a common phenomenon that two or more banknotes are stuck together. If the banknotes cannot be accurately distinguished, it will cause serious errors.
  • ATM automatic teller machine
  • TVM ticket vending machine
  • a common method for distinguishing whether a banknote is re-folded is to detect whether the banknote is re-folded by using the thickness of the banknote, such as detecting the thickness of the banknote by a method such as a Hall element, or detecting the thickness of the banknote by using an ultrasonic sensor.
  • the method of detecting whether or not the sheet is re-expanded only by the thickness of the banknote such as the degree of contamination of the surface of the banknote, such as dust, and the use condition of the banknotes, etc., all of which affect the accuracy of detecting the re-drawing of the banknote by the thickness.
  • Another commonly used method for detecting the weight of a banknote is to detect whether the banknote is re-stretched by the method of transmitting light intensity.
  • the detection method provided by US Pat. No. 6,082,732 detects whether the banknote is re-expanded by detecting whether the transmitted light intensity is greater than a threshold value.
  • the method can only detect whether the banknotes overlap on the medium. Due to the difference in color of different banknotes and the newness of different banknotes, it is difficult to ensure the accuracy of the detection by using only the light transmission intensity feature on the banknote medium to detect whether the banknotes are re-expanded.
  • the present invention has been made in view of the problems in the related art that the accuracy of the banknotes is often difficult to ensure when detecting the re-folding of the banknotes. Therefore, the main object of the present invention is to provide a method and device for detecting the re-folding of banknotes, and a self-service terminal. To solve the above problem. In order to achieve the above object, according to an aspect of the present invention, a method of detecting a sheet double sheet is provided.
  • the method for detecting the re-folding of the banknote comprises: detecting a safety line of the banknote to be tested, obtaining safety line characteristic data; determining whether the safety line characteristic data meets the first predetermined condition; and, if the safety line characteristic data does not meet the first predetermined condition In the case, it is determined that there is a double sheet of the banknote to be tested.
  • a detecting device for re-folding of a bill is provided.
  • the detecting device for re-folding the banknote comprises: a safety line detector for detecting a safety line of the banknote to be tested, obtaining safety line characteristic data; a memory for storing reference data of the banknote to be tested; and a processor for It is judged whether the security line characteristic data meets the first predetermined condition based on the reference data, and if the security line characteristic data does not satisfy the first predetermined condition, it is determined that the banknote to be tested is re-folded.
  • a self-service terminal including a detecting device for re-folding of a bill provided by the present invention is provided.
  • the safety line of the banknote to be tested is detected to obtain the safety line characteristic data; the safety line characteristic data is judged to meet the first predetermined condition; and, if the safety line characteristic data does not meet the first predetermined condition, the determination is made.
  • the banknotes to be tested are re-opened. Since the detection of whether or not the banknote is re-stretched by the security thread on the banknote is not affected by the color and the oldness of the banknote, the problem of accuracy in the detection of whether the banknote is re-expanded is often difficult to ensure in the related art. Further, it is convenient to detect whether the banknote is re-tensioned, and to improve the accuracy of the banknote detection.
  • FIG. 1 is a schematic view of a bill multi-sheet detecting apparatus according to an embodiment of the present invention
  • FIG. 2 is a flow chart of a bill multi-sheet detecting method according to an embodiment of the present invention
  • FIG. 4 is a flow chart of an image size compliance detecting step of the banknote multi-sheet detecting method according to the present invention
  • FIG. 5 is a security line of the banknote multi-sheet detecting method according to the present invention
  • Figure 6 is a flow chart showing the steps of detecting the transmitted light intensity compliance of the banknote multi-sheet detecting method according to the present invention
  • Figure 7a is a schematic diagram of the signal waveform of the double-safe line detecting of the present invention
  • Is a schematic diagram of the waveform of the safety line signal when the banknotes of the present invention are completely overlapped
  • FIG. 8a is a schematic view of the banknote of the present invention
  • Figure 8b is a schematic view of the transmitted light waveform of the banknote of Figure 8a of the present invention.
  • the bill multi-sheet detecting device 10 includes a controller 12, a security line detector 16, and a storage 20 that stores various data.
  • the safety line detector 16 is used for detecting the safety line of the banknote.
  • the commonly used safety detector is a magnetic detecting device, such as a magnetic sensitive magnetic head, a magnetoresistive magnetic head, etc., and outputs a banknote safety line detection signal, and determines safety according to the safety line signal of the banknote.
  • the safety line detector 16 detects the safety line of the banknote to be tested and obtains the security line characteristic data.
  • the storage device 20 may include a RAM memory, a FLASH memory, or the like, wherein the RAM memory temporarily stores various processing data in the banknote multi-sheet detecting device, such as the type of the banknote to be tested, the size data of the scanned image, the number of security lines, and the transmitted light data.
  • the FLASH memory is used to store reference data of the banknotes to be tested, such as a reference size for storing various banknotes, a number of security lines for various banknotes, a threshold value of transmitted light intensity of various banknotes, and the like.
  • the controller 12 is for controlling the safety line detector 16 to detect the safety line of the banknote to be measured, and to process related data and the like.
  • the controller 12 is capable of judging whether the security line feature data conforms to the first predetermined condition based on the reference data, and determining that the banknote to be tested is re-folded if the security line feature data does not satisfy the first predetermined condition.
  • the above-described bill multi-sheet detecting device 10 may further include an acquiring mechanism for acquiring size data of the banknote to be tested, and the acquiring mechanism may include an image scanner 14, wherein the image scanner 14 is for treating The banknote is scanned to obtain scanned image data of the banknote.
  • the common image scanner is a charge coupled image sensor (CCD), a contact image sensor (CIS) or a CMOS image sensor, and the size of the scanned image is determined according to the scanned image data. .
  • the image scanner 14 scans the image of the banknote to be tested before the security thread detector 16 detects the security line of the banknote to be tested to cause the processor to determine whether the size data of the banknote to be tested meets the second predetermined condition, in the banknote to be tested If the size of the banknote does not meet the second predetermined condition, it is directly determined that there is a double sheet of the banknote to be tested, and no further inspection is required, which simplifies the operation flow, and the control is safe if the size of the banknote to be tested meets the predetermined condition.
  • the line detector detects the safety line of the banknote to be tested.
  • the bill multi-sheet detecting device 10 may further include a transmitted light detector 18 including a light emitter, a light receiver, and the like, the banknote being illuminated by the light emitter, and the light passing through the banknote is received by the light receiver and Output transmitted light data.
  • a commonly used light emitter is an infrared light emitter
  • the light receiver is an infrared light receiver.
  • Step S102 detecting a safety line of the banknote to be tested, and obtaining safety line characteristic data.
  • the security line feature data may include the number of security lines and the security line signal strength.
  • Step S104 determining whether the security line feature data meets the first predetermined condition. In this step, it may be determined whether the security line feature data meets the first predetermined condition by determining whether the number of security lines or the security line signal strength meets a preset condition, and the first predetermined condition is based on the number of security lines or a single sheet of the single banknote.
  • the security line signal strength setting of the banknote includes: determining whether the number of security lines is equal to a preset number, wherein the preset quantity is set according to the security line data of the single banknote When the number of safety lines is equal to the preset number, it is determined whether the signal strength of the safety line is consistent with the signal strength of the preset safety line, wherein the signal strength of the preset safety line is set according to the signal strength of the safety line of the single banknote; When the line signal strength is consistent with the preset safety line signal strength, it is determined that the safety line characteristic data meets the first predetermined condition.
  • Step S106 If the safety line characteristic data does not meet the first predetermined condition, it is determined that the banknote to be tested has a re-tension. If the detected safety line characteristic data does not meet the pre-set conditions, it indicates that there is a re-tension phenomenon.
  • the method may further include: obtaining size data of the banknote to be tested; determining, according to the size data of the banknote to be tested, whether the size of the banknote to be tested conforms to the second predetermined strip
  • the second predetermined condition is set according to the size data of the single banknote; and in the case that the size of the banknote to be tested does not meet the second predetermined condition, determining that the banknote to be tested is re-folded, wherein, in the banknote to be tested When the size meets the predetermined conditions, the safety line of the banknote to be tested is continuously detected.
  • the security line of the banknote to be tested is detected when the size of the banknote to be tested cannot be determined by the size of the banknote to be tested, thereby improving The efficiency of the detection avoids unnecessary detection steps.
  • the obtaining the size data of the banknote to be tested includes: scanning the banknote to be tested, acquiring a scanned image of the banknote to be tested; and processing the scanned image to obtain size data of the banknote to be tested, and determining the to-be-tested according to the size data of the banknote to be tested Whether the size of the banknote meets the second predetermined condition comprises: obtaining a banknote type of the banknote to be tested according to the scanned image; finding a reference size corresponding to the banknote type, wherein the reference size includes a reference length and a reference width; and the size of the scanned image is not greater than the above reference When the size is determined, the size of the banknote to be tested is determined to meet the second predetermined condition; when the size of the scanned image is larger than the reference size, it is determined that the size of the banknote to be tested does not meet the second predetermined condition.
  • the method may further include: irradiating the banknote to be tested, acquiring the transmitted light data of the banknote to be tested; determining whether the transmitted light data meets the third predetermined condition, The three predetermined conditions are set according to the transmitted light data of the single banknote; and in the case where the transmitted light data does not satisfy the third predetermined condition, it is determined that the banknote to be tested is re-folded.
  • the size, the security thread and the transmitted light of the banknote to be tested are sequentially detected, and if any one of them does not meet the condition, it is determined that the banknote to be tested has a phenomenon of re-tensioning, thereby greatly improving the banknote to be tested.
  • the banknotes to be tested are irradiated, and the transmitted light data of the banknotes to be tested includes: irradiating different areas of the banknotes to be tested, obtaining transmitted light data of the banknotes to be tested in different areas; and transmitting light data of the banknotes to be tested in different areas
  • Performing weighted averaging to obtain a weighted average of the transmitted light data, and determining whether the transmitted light data meets the third predetermined condition comprises: determining whether the weighted average of the transmitted light data meets the third predetermined condition.
  • Step S10 image size detection, obtaining size data of the banknote to be tested.
  • the image scanner 14 scans the banknote to be measured, and acquires scanned image data of the banknote; the controller 12 processes the scanned image data to obtain size data of the scanned image, such as image length, width, and the like.
  • size data of the scanned image such as image length, width, and the like.
  • other size detecting means can also be used for detecting.
  • step S20 it is determined whether the banknote size requirement is met. Determining whether the size of the banknote to be tested meets the second predetermined condition described above.
  • the controller 12 compares image size data (such as image length and width) of the banknote to be tested obtained by the image scanner 14 in step S10 with size data of the banknote type stored in the storage 20 (ie, a single banknote) Length and width) Compare and judge whether the image size of the banknote to be tested meets the banknote size requirements. If it does not meet the requirements, go to step S74; if it meets the requirements, go to step S30 and proceed to the next step. Step S30, the security line is detected.
  • image size data such as image length and width
  • size data of the banknote type stored in the storage 20 ie, a single banknote) Length and width
  • the safety line detector 16 such as a magnetic sensitive magnetic head, a magnetoresistive magnetic head, etc., detects a safety line in the banknote to be tested, and outputs a safety line signal; the controller 12 processes the safety line signal to determine a safety line of the banknote to be tested. Characteristic data, such as the number of safety lines, the strength of the safety line signal, etc. In step S40, it is determined whether the security line feature requirement is met. Determining whether the safety line characteristic data of the banknote to be tested meets the first predetermined condition described above.
  • the controller compares the security thread characteristic data of the banknote to be tested (such as the number of security lines, the security line signal strength) obtained by the 12 security line detector 16 in step S30 with the security line characteristic data of the banknote type preset in the storage 20 ( That is, the number of safety lines of a single banknote, the strength of the security line signal, etc.) are compared to determine whether the banknote to be tested meets the requirements of the security line feature of the banknote. If it does not meet the requirements, go to step S74; if it meets the requirements, go to step S50 and proceed to the next step. Step S50, transmitted light detection.
  • the security thread characteristic data of the banknote to be tested such as the number of security lines, the security line signal strength
  • a partial area of the banknote is irradiated by the light emitter in the transmitted light detector 18, and the irradiated light of the banknote is received by the light receiver, and the transmitted light data of the banknote is output; the common light emitter and the light receiver are infrared light. Transmitter, infrared light receiver.
  • step S60 it is determined whether the light intensity requirement is met. Determining whether the transmitted light data of the banknote to be tested meets the third predetermined condition described above.
  • the transmitted light data acquired in step S50 is analyzed by the controller 12, and the weighted average value of the transmitted light data is calculated, which is simply referred to as a weighted average value, which reduces the watermark, the stripe, the pattern, the security line, and the like in the banknote.
  • the influence of light can better reflect the inverse relationship between the transparency of the banknote and the thickness of the banknote.
  • step S72 the banknotes are not re-expanded.
  • step S74 the banknotes are re-folded.
  • Step S22 reading the banknote size data of the single banknote stored in the storage.
  • the controller identifies the type of the banknote to be tested by the processing of the detected data, such as the scanned image data.
  • the specific processing method of the banknote identification does not belong to the content of the present invention, and details are not described herein again.
  • the single banknote size data stored in the storage 20 is read in accordance with the type of the identified banknote, including the preset length and the preset width of the single banknote. After the step is performed, it is determined whether the size of the banknote to be tested meets the second predetermined condition mentioned above according to the size data of the banknote to be tested, for example, by performing step S24 and step S26 described below.
  • Step S24 determining whether the image length of the banknote to be tested is greater than a preset length of the single banknote.
  • the controller 12 processes the scanned image of the banknote to be measured, for example, using the grayscale difference of the edge of the image to determine the image edge, and obtains the image size of the banknote to be tested, such as the image length and the image width; and the image length and the leaflet of the banknote to be tested.
  • the preset length of the banknote is compared, when the image length of the banknote to be tested is greater than the preset length of the single banknote, indicating that the image size of the banknote to be tested does not meet the size requirement of the single banknote, then the process proceeds to step S74 in the above embodiment; Otherwise, step S26 is performed to perform the next processing.
  • Step S26 determining whether the image width of the banknote to be tested is greater than a preset width of the single banknote.
  • the image width of the banknote to be tested is compared with the preset width of the single banknote. If the image width of the banknote to be tested is greater than the preset width of the single banknote, the image size of the banknote to be tested does not meet the size requirement of the single banknote. Go to step S74 in the above embodiment; otherwise, go to step S30 in the above embodiment.
  • the execution sequence of the above steps S24 and S26 may be adjusted as needed. For example, step S26 may be performed first, then step S24 may be performed, or steps S24 and S26 may be performed simultaneously, and the detection may be performed regardless of the order of the two steps.
  • the banknotes to be tested are obtained by acquiring the image size of the banknotes to be tested, including the image length and image width of the banknotes to be tested.
  • the image length and/or image width is compared with the preset length and/or preset width of a single banknote of its corresponding type, so that whether the banknote to be tested is re-stretched can be determined from the outer size of the banknote.
  • Step S42 Determine whether the number of security lines of the banknote to be tested is equal to the set number.
  • the controller compares the number of safety lines of the banknotes to be tested with the number of safety lines of the type of the banknotes to be tested preset in the storage 20. If they are equal, the number of safety lines of the banknotes to be tested conforms to the number of safety lines of the single banknotes, Go to step S44; if they are not equal, indicating that the banknote to be tested does not meet the number of security lines of the single banknote, go to step S74 in the above embodiment.
  • Step S44 determining whether the security line signal strength of the banknote to be tested is consistent with the preset security line signal strength.
  • the safety line signal of the controller to be tested is compared with the safety line signal strength of the type of the banknote to be tested preset in the storage 20. If they are consistent, the banknote to be tested meets the safety line signal strength requirement of the single banknote. Go to step S50 in the above embodiment; if it is inconsistent, indicating that the banknote to be tested does not meet the security line signal strength requirement of the single banknote, then go to step S74 in the above embodiment. It should be noted that the above steps S42 and S44 may be performed only one or both, and when both are executed, the order of step S42 and step S44 is variable.
  • the security thread on each banknote can be varied within a certain range, when two or more banknotes are overlapped, the security thread of each banknote is difficult to completely overlap, and therefore, by obtaining the security of the banknote to be tested
  • the line feature compares the security line feature of the banknote to be tested with the security line feature of the corresponding type of banknote, thereby determining whether the banknote is re-tensioned.
  • the number of safety line signals detected by the safety line detector 16 can be determined to determine the number of safety lines. For example, the number of security lines of a certain type of banknote is one.
  • the banknotes are re-expanded, for example, when the safety line detector 16 detects the two safety line signals 30 and 32 in FIG. 7a. It can be determined that the banknote to be inspected has at least two security lines 34, 36, that is, at least two banknotes overlap. However, if it is detected that the banknote security line signal to be tested is one, if the security line detector 16 detects the signal 40 shown in FIG. 7b, it cannot be determined that the banknote to be tested does not re-fold, because, in extreme cases, two When sheets or two or more banknotes overlap, their respective security lines may overlap completely. Therefore, it is also necessary to judge the number of security lines from the strength of the safety line signal.
  • the number of safety lines of the banknote to be tested can be consistent with the set value. Due to the different degrees of old and new banknotes and different versions of banknotes, the change in the strength of the security line detection signal of the same type of banknotes will be large. Therefore, the error is greater when detecting by signal strength. Generally, only the number of safety line signals of the banknote to be tested is used to determine whether the safety line feature meets the requirements of a single banknote, and at the same time, the detection of other features of the banknote to be tested is used to eliminate the case where two or more banknote security lines are completely overlapped.
  • Step S52 calculating a weighted average value.
  • this step further processes the transmitted light data detected in step S50 to obtain a weighted average value of the transmitted light data, that is, a weighted average value, wherein, the light transmittance
  • the abnormal area includes the light-transmissive area (such as the unpatterned or textured area of the banknote) and the non-transparent area (such as the security line, the pattern with obvious color), the light-transmissive area, and the light-corresponding area. The value is relatively small.
  • Step S54 determining whether the weighted average value is greater than a light intensity threshold.
  • the light intensity threshold corresponding to the type of the banknote in 20 indicates that the transmitted light intensity of the banknote to be tested conforms to the light intensity requirement of the single banknote, and then proceeds to step S72 (see FIG.
  • step S74 if the weighted average is less than the light intensity threshold, If the transmitted light intensity of the banknote to be tested does not meet the light intensity requirement of the single banknote, then go to step S74 (see Fig. 3).
  • the method of determining the light intensity threshold will be described below with reference to Figs. 8a and 8b. Since the dust adhered to the surface of the banknote after the use of the banknote for a period of time, the light transmittance of the old banknote is reduced, so that the light transmittance of the old coin is worse than that of the new coin; meanwhile, the thicker the banknote, the worse the light transmittance, and the thinner the banknote The better the sex, the light transmittance of a single banknote is higher than that of two banknotes.
  • the translucency of a single SGD, a single old coin, two SGD, and two old coins is arranged from strong to weak, followed by a single SGD, a single old coin, and two SGD. , two old coins. Therefore, if The fixed light intensity threshold can distinguish the difference in light transmittance between the single old coin and the two new coins, and the light intensity threshold value can be used as a reference to determine whether the banknote is re-expanded.
  • the area 52 of the banknote 50 to be tested is illuminated by the infrared light emitter in the transmission detector 18 along the direction 54 shown in FIG. 8a, and the infrared light receiver receives the illumination light transmitted through the banknote, and outputs the transmitted light data of the banknote.
  • the infrared transmitted light data curve of the old coins is the curve 60 in Fig. 8b
  • the infrared transmitted light data curves of the two new coins are the curve 62 in Fig. 8b.
  • the horizontal axis is the length of the banknote
  • the vertical axis is the transmitted light. Data size. As can be seen from the waveforms of curves 60, 62, although most of the data on curve 60 is greater than the data on curve 62, since the two curves intersect, it is not possible to distinguish the two curves directly by the size of the transmitted light data. Therefore, by formula
  • straight lines 64 and 66 there is a certain distance between the straight lines 64 and 66, and the straight line 64 can be utilized.
  • a straight line 68 between 66 distinguishes the curves 60, 62, that is, the weighted average corresponding to the straight line 68 is the light intensity threshold for determining whether the transmitted light intensity meets the requirements.
  • the weighted average of the banknotes to be tested is the weighted average of the single banknotes, that is, the banknotes to be tested are single banknotes; if the weighted average of the banknotes to be tested is below the straight line 68, the weighted average of the banknotes to be tested is two One or more banknotes.
  • the weight average, that is, the banknotes to be tested are multiple banknotes.
  • the weighted average of the banknotes to be tested is obtained, and compared with the reference threshold to determine whether the banknotes are
  • it can overcome the influence of the aging of the banknote medium, the adhesion of dust, etc. on the thickness detection result of the banknote, and ensure the reliability of the detection result.
  • the light-sensitive light-transmissive area and the scan data corresponding to the light-transmissive area that is insensitive to transmitted light enable the average value of the transmission data to accurately reflect the thickness of the banknote, thereby ensuring the accuracy of the detection result.
  • the execution order of the safety line feature detection and the transmitted light intensity detection may be set as needed.
  • the banknote to be tested is re-expanded; when all three detection results satisfy the set condition , indicating that the banknote to be tested is a single banknote. Since multiple banknotes overlap, the shape The probability of non-overlapping and the safety line not overlapping is relatively large. Therefore, it is determined that the outer shape of the banknote to be tested or the security line feature can quickly exclude whether the banknotes overlap. Therefore, the detection sequence provided by the embodiment of the present invention is a preferred detection sequence.
  • the embodiment of the present invention further provides a self-service terminal, such as a self-service cash dispenser, a self-service deposit machine or a self-service ticket vending machine, which has the detecting device for re-folding of the banknote provided by any of the above embodiments.
  • a self-service terminal such as a self-service cash dispenser, a self-service deposit machine or a self-service ticket vending machine, which has the detecting device for re-folding of the banknote provided by any of the above embodiments.

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纸币重张的检测方法及装置、 自助终端 技术领域 本发明涉及纸币检测领域， 具体而言， 涉及一种纸币重张的检测方法及装置、 自 助终端。 背景技术 在现金交易装置 （自助终端） 中要不断地接收纸币， 特别是进行银行业务的自动 出纳机 （ATM), 用于铁路系统的自动售票机 （TVM)， 需要鉴别各种纸币。 由于纸币 表面状况不同及气候条件的影响， 两张或多张纸币粘在一起是常见现象， 如果不能准 确分辩纸币是否重张， 会导致严重错误。 分辩纸币是否重张的常用方法是利用纸币的厚度来检测纸币是否重张， 如利用霍 尔元件等方法检测纸币的厚度， 或者利用超声波传感器检测纸币的厚度。 然而， 仅利 用纸币厚度来检测其是否重张的方法存在检测误差， 如纸币表面粘有灰尘等的受污染 程度， 纸币新旧等的使用状况， 都影响利用厚度检测纸币重张的准确率。 另外一个常用纸币重张检测方法为通过透射光强度的方法来检测纸币是否重张， 如美国专利 US6,082,732所提供的检测方法， 通过检测透射光强度是否大于阈值的方 法检测纸币是否重张。 然而该方法只能检测纸币在介质上是否重叠， 由于不同纸币的 颜色差别、 不同纸币的新旧程度， 仅仅利用纸币介质上的透光强度特征来检测纸币是 否重张， 检测的准确性难以保证。 发明内容 针对相关技术中在对纸币是否重张进行检测时准确性往往难以保证的问题而提出 本发明， 为此， 本发明的主要目的在于提供一种纸币重张的检测方法及装置、 自助终 端， 以解决上述问题。 为了实现上述目的， 根据本发明的一个方面， 提供了一种纸币重张的检测方法。 该纸币重张的检测方法包括： 对待测纸币的安全线进行检测， 得到安全线特征数据； 判断安全线特征数据是否符合第一预定条件； 以及， 在安全线特征数据不符合第一预 定条件的情况下， 判定待测纸币存在重张。 为了实现上述目的， 根据本发明的另一方面， 提供了一种纸币重张的检测装置。 该纸币重张的检测装置包括： 安全线检测器， 用于对待测纸币的安全线进行检测， 得 到安全线特征数据； 存储器， 用于存储待测纸币的基准数据； 以及， 处理器， 用于根 据基准数据判断安全线特征数据是否符合第一预定条件， 以及在安全线特征数据不符 合第一预定条件的情况下， 判定待测纸币存在重张。 为了实现上述目的， 根据本发明的另一方面， 提供了一种自助终端， 该自助终端 包括本发明所提供的纸币重张的检测装置。 通过本发明， 采用对待测纸币的安全线进行检测， 得到安全线特征数据； 判断安 全线特征数据是否符合第一预定条件； 以及， 在安全线特征数据不符合第一预定条件 的情况下，判定待测纸币重张。 由于通过纸币上的安全线实现对纸币是否重张的检测， 不会受到纸币颜色和新旧程度的影响， 因而解决了相关技术中在对纸币是否重张进行 检测时准确性往往难以保证的问题， 进而达到了方便地对纸币是否重张进行检测， 以 及提高纸币检测的准确性效果。 附图说明 此处所说明的附图用来提供对本发明的进一步理解， 构成本申请的一部分， 本发 明的示意性实施例及其说明用于解释本发明， 并不构成对本发明的不当限定。 在附图 中： 图 1是根据本发明实施例的纸币重张检测装置的示意图； 图 2是根据本发明实施例的纸币重张检测方法的程序流程图； 图 3是根据本发明的纸币重张检测方法的优选实施例的程序流程图； 图 4是根据本发明的纸币重张检测方法的图像尺寸符合性检测步骤的流程图； 图 5是根据本发明的纸币重张检测方法的安全线特征符合性检测步骤的流程图； 图 6是根据本发明的纸币重张检测方法的透射光强度符合性检测步骤的流程图； 图 7a是本发明的双安全线检测的信号波形示意图； 图 7b是本发明的纸币完全重叠时安全线信号波形示意图； 图 8a是本发明的纸币示意图; 图 8b是本发明的图 8a中纸币的透射光波形示意图。 具体实施方式 需要说明的是， 在不冲突的情况下， 本申请中的实施例及实施例中的特征可以相 互组合。 下面将参考附图并结合实施例来详细说明本发明。 图 1是根据本发明实施例的纸币重张检测装置的示意图。 下面依图进行说明。 如图 1所示， 纸币重张检测装置 10包括： 控制器 12， 安全线检测器 16以及存储 各种数据的储存器 20。 安全线检测器 16用于检测纸币的安全线， 常用的安全检测器为磁性检测器件， 如 磁敏式磁头、 磁阻式磁头等， 输出纸币安全线检测信号， 根据纸币的安全线信号确定 安全线数量。该安全线检测器 16对待测纸币的安全线进行检测之后得到安全线特征数 据。 储存器 20可以包括 RAM存储器、 FLASH存储器等， 其中， RAM存储器暂存纸 币重张检测装置中的各种处理数据， 如待测纸币的类型、 扫描图像的尺寸数据、 安全 线数量、 透射光数据等； FLASH存储器用于存储待测纸币的基准数据， 例如存储各种 纸币的基准尺寸、 各种纸币的安全线数量、 各种纸币的透射光强度阈值等。 控制器 12用于控制安全线检测器 16对待测纸币的安全线进行检测， 以及对相关 数据进行处理等。该控制器 12能够根据基准数据判断安全线特征数据是否符合第一预 定条件， 并且在安全线特征数据不符合第一预定条件的情况下， 判定待测纸币存在重 张。 上述的纸币重张检测装置 10还可以包括获取机构，该获取机构用于获取所述待测 纸币的尺寸数据， 并且该获取机构可以包括图像扫描器 14， 其中， 该图像扫描器 14 用于对待测纸币进行扫描， 获取纸币的扫描图像数据， 常见的图像扫描器为电荷耦合 图像传感器 （简称 CCD)、 接触式图像传感器 （简称 CIS) 或 CMOS图像传感器等， 根据扫描图像数据确定扫描图像的尺寸。 优选地， 图像扫描器 14在安全线检测器 16 检测待测纸币的安全线之前对待测纸币的图像进行扫描以使处理器判断待测纸币的尺 寸数据是否符合第二预定条件， 在待测纸币的尺寸不符合第二预定条件的情况下， 直 接判定待测纸币存在重张， 从而不需再进行进一步的检测， 简化了操作流程， 在待测 纸币的尺寸符合预定条件的情况下，控制安全线检测器对待测纸币的安全线进行检测。 该纸币重张检测装置 10还可以包括透射光检测器 18， 该透射光检测器 18包括光 发射器、 光接收器等， 由光发射器照射纸币， 由光接收器接收透过纸币的光线并输出 透射光数据。 常用的光发射器为红外光发射器， 光接收器为红外光接收器。 以下对本发明实施例提供的纸币重张检测方法进行介绍， 本发明实施例所提供的 检测方法可以通过但不限于上述的纸币重张检测装置来实现。 图 2是根据本发明实施例的纸币重张检测方法的程序流程图。 如图所示， 该方法 包括以下步骤： 步骤 S102, 对待测纸币的安全线进行检测， 得到安全线特征数据。 其中， 安全线特征数据可以包括安全线数量和安全线信号强度。 步骤 S104, 判断安全线特征数据是否符合第一预定条件。 在该步骤中， 可以是通过判断安全线数量或者安全线信号强度是否满足预设的条 件判断安全线特征数据是否符合第一预定条件， 第一预定条件根据单张纸币的安全线 数量或单张纸币的安全线信号强度设定。 优选地， 在安全线特征数据包括安全线数量和安全线信号强度时， 该步骤包括： 判断安全线数量是否等于预设的数量， 其中， 预设的数量根据单张纸币的安全线数据 设定； 在安全线数量等于预设的数量时， 判断安全线信号强度是否与预设安全线信号 强度一致， 其中， 预设安全线信号强度根据单张纸币的安全线信号强度设定； 以及在 安全线信号强度与预设安全线信号强度一致时， 判定安全线特征数据符合第一预定条 件。 通过对安全线的数量和信号强度进行检测， 即， 将安全线数量和安全线信号强度 作为安全线特征数据与第一预定条件进行比较， 不仅操作简便， 而且可以提高检测的 准确性。 需要说明的是， 判断安全线数量是否等于预设的数量和判断安全线信号强度是否 与预设安全线信号强度一致的顺序是可以任意的。 步骤 S106, 在安全线特征数据不符合第一预定条件的情况下， 判定待测纸币存在 重张。 如果检测到的安全线特征数据不符合预先设定的条件， 则说明存在重张现象。 优选地， 在对待测纸币的安全线进行检测之前， 上述方法还可以包括： 获取待测 纸币的尺寸数据； 根据待测纸币的尺寸数据判断待测纸币的尺寸是否符合第二预定条 件， 其中， 第二预定条件根据单张纸币的尺寸数据设定； 以及在待测纸币的尺寸不符 合第二预定条件的情况下， 判定待测纸币存在重张， 其中， 在待测纸币的尺寸符合预 定条件的情况下， 继续对待测纸币的安全线进行检测。 在该实施例中， 由于首先通过 待测纸币的尺寸判断待测纸币存在重张， 在通过待测纸币的尺寸无法判定纸币重张的 情况下才对待测纸币的安全线进行检测， 从而提高了检测的效率， 避免了不必要的检 测步骤。 上述获取待测纸币的尺寸数据包括： 对待测纸币进行扫描， 获取待测纸币的扫描 图像； 以及， 对扫描图像进行处理， 得到待测纸币的尺寸数据， 根据待测纸币的尺寸 数据判断待测纸币的尺寸是否符合第二预定条件包括： 根据扫描图像得到待测纸币的 纸币类型； 查找纸币类型对应的基准尺寸， 其中， 基准尺寸包括基准长度和基准宽度； 在扫描图像的尺寸不大于上述基准尺寸时， 判定待测纸币的尺寸符合第二预定条件； 在扫描图像的尺寸大于上述基准尺寸时， 判定待测纸币的尺寸不符合第二预定条件。 优选地， 在安全线特征数据符合第一预定条件的情况下， 上述方法还可以包括： 对待 测纸币进行照射， 获取待测纸币的透射光数据； 判断透射光数据是否符合第三预定条 件， 第三预定条件根据单张纸币的透射光数据设定； 以及在透射光数据不符合第三预 定条件的情况下， 判定待测纸币存在重张。 在该实施例中， 依次对待测纸币的尺寸、 安全线和透射光进行检测， 在其中任意一个不符合条件的情况下， 判定待测纸币存在 重张现象， 因而， 极大地提高了对待测纸币是否存在重张检测的准确性。 其中， 对待测纸币进行照射， 获取待测纸币的透射光数据包括： 对待测纸币不同 的区域进行照射， 获取不同区域待测纸币的透射光数据； 以及， 对不同区域待测纸币 的透射光数据进行加权平均， 得到透射光数据的加权平均值， 判断透射光数据是否符 合第三预定条件包括： 判断透射光数据的加权平均值是否符合第三预定条件。 通过加 权平均的计算， 进一步地提高了检测的准确性。 图 3是根据本发明的纸币重张检测方法的优选实施例的程序流程图， 详细的处理 流程如下： 步骤 S10， 图像尺寸检测， 获取待测纸币的尺寸数据。 例如， 图像扫描器 14对待测纸币进行扫描后， 获取纸币的扫描图像数据； 控制器 12对扫描图像数据进行处理后得到扫描图像的尺寸数据， 如图像长度、 宽度等。 除了 采用图像扫描的方式进行检测的方法之外，也可以采用其他的尺寸检测手段进行检测。 步骤 S20， 判断是否符合纸币尺寸要求。 判断待测纸币的尺寸是否符合上述的第二预定条件。 例如， 控制器 12将图像扫描器 14在步骤 S10中得到的待测纸币的图像尺寸数据 (如图像长度和宽度）与在储存器 20中存储的该纸币类型的尺寸数据（即单张纸币的 长度和宽度） 进行对比， 判断待测纸币的图像尺寸是否符合纸币尺寸要求。 如果不符 合要求， 则转到步骤 S74; 如果符合要求， 则转到步骤 S30， 进行下一步处理。 步骤 S30， 安全线检测。 安全线检测器 16， 如磁敏式磁头、 磁阻式磁头等， 检测待测纸币中的安全线， 输 出安全线信号；由控制器 12对安全线信号进行处理，确定待测纸币的安全线特征数据， 如安全线数量、 安全线信号强度等。 步骤 S40， 判断是否符合安全线特征要求。 判断待测纸币的安全线特征数据是否符合上述第一预定条件。 控制器将 12安全线检测器 16在步骤 S30得到的待测纸币安全线特征数据 （如安 全线数量、安全线信号强度）与在储存器 20中预置的该纸币类型的安全线特征数据（即 单张纸币的安全线数量、 安全线信号强度等） 进行对比， 判断待测纸币是否符合纸币 的安全线特征要求。 如果不符合要求， 则转到步骤 S74; 如果符合要求， 则转到步骤 S50, 进行下一步处理。 步骤 S50， 透射光检测。 由透射光检测器 18中的光发射器对纸币的部分区域进行照射、由光接收器接收透 过纸币的照射光线， 输出纸币的透射光数据； 常见的光发射器、 光接收器为红外光发 射器、 红外光接收器。 步骤 S60， 判断是否符合光强度要求。 判断待测纸币的透射光数据是否符合上述第三预定条件。 由控制器 12对步骤 S50获取的透射光数据进行分析，计算透射光数据的加权平均 值， 简称加权平均值， 该加权平均值降低了纸币中水印、 条纹、 图案、 安全线等区域 对纸币透光性的影响， 能够较好地反映纸币透光性与纸币厚度之间成反比的关系。 由 于透射光越强透射光数据越大、 透射光越弱透射光数据越小， 因此可以利用表示透射 光数据大小的加权平均值表示纸币的透射光强度， 以下简称光强度。 如果符合光强度 要求， 转到步骤 S72; 如果不符合光强度要求， 则转到步骤 S74。 步骤 S72， 纸币未重张。 当待测纸币的图像尺寸、 安全线特征和透射光强度全部符合要求时， 说明待测纸 币为单张纸币。 步骤 S74， 纸币重张。 当待测纸币的图像尺寸、 安全线特征和透射光强度中的任意一个不符合要求时， 说明纸币重张。 该实施例通过检测扫描图像的尺寸， 可以检测出纸币非正对时的重张现象； 通过 检测纸币安全线的符合性， 可以检测纸币除了安全线完全相对时的纸币重张现象； 通 过纸币透射光强度大小检测纸币厚度变化， 从而检测纸币重张现象。 通过对纸币多个 特征的检测， 解决了单个特征检测准确度不高、 检测结果不稳定等不足， 保证了检测 结果的可靠性。 下面结合图 4说明待测纸币的图像尺寸是否符合纸币尺寸要求的判断方法， 该方 法包括： 步骤 S22， 读取储存器中存储的单张纸币的纸币尺寸数据。 控制器通过检测数据的处理， 如扫描图像数据， 识别出待测纸币的纸币类型， 纸 币识别的具体处理方法不属于本发明的内容， 在此不再赘述。 根据已识别纸币的类型 读取存储在储存器 20中的单张纸币尺寸数据， 包括单张纸币的预置长度和预置宽度。 在执行完该步骤后， 再根据待测纸币的尺寸数据判断所述待测纸币的尺寸是否符 合上述提到的第二预定条件，例如，可以通过执行下述的步骤 S24和步骤 S26来实现。 步骤 S24， 判断待测纸币的图像长度是否大于单张纸币的预置长度。 控制器 12对待测纸币的扫描图像进行处理，如利用图像边缘的灰度差异进行图像 边缘判定， 得到待测纸币的图像尺寸， 如图像长度、 图像宽度； 将待测纸币的图像长 度与单张纸币的预置长度进行对比，当待测纸币的图像长度大于单张纸币的预置长度， 说明待测纸币的图像尺寸不符合单张纸币尺寸要求，则转到上述实施例中的步骤 S74; 否则， 执行步骤 S26， 进行下一步的处理。 步骤 S26， 判断待测纸币的图像宽度是否大于单张纸币的预置宽度。 控制器 12对待测纸币的图像宽度与单张纸币的预置宽度进行对比，如果待测纸币 的图像宽度大于单张纸币的预置宽度， 说明待测纸币的图像尺寸不符合单张纸币尺寸 要求， 转到上述实施例中的步骤 S74; 否则， 转到上述实施例中的步骤 S30。 上述步骤 S24、 S26 的执行顺序可以根据需要进行调整， 比如也可以先执行步骤 S26, 再执行步骤 S24， 或者步骤 S24和 S26同时进行， 无论该两项步骤按何种顺序执 行， 都可以实现检测待测纸币的图像尺寸是否满足单张纸币的尺寸要求的目的。 由于两张或两张以上纸币重叠时， 重叠的纸张在长度和 /或宽度很难对齐， 因此， 通过获取待测纸币的图像尺寸， 包括待测纸币的图像长度和图像宽度， 使待测纸币的 图像长度和 /或图像宽度与其对应类型的单张纸币的预置长度和 /或预置宽度进行对比， 从而可以从纸币的外形尺寸判断待测纸币是否重张。 下面结合图 5说明待测纸币的安全线特征是否符合要求的判断方法，该方法包括: 步骤 S42， 判断待测纸币的安全线数量是否等于设定数量。 控制器将待测纸币的安全线数量与预置在储存器 20 中的该待测纸币类型的安全 线数量进行比较， 如果相等， 说明待测纸币符合单张纸币的安全线的数量要求， 转到 步骤 S44; 如果不相等， 说明待测纸币不符合单张纸币的安全线的数量要求， 则转到 上述实施例中的步骤 S74。 步骤 S44， 判断待测纸币的安全线信号强度是否与预设安全线信号强度一致。 控制器对待测纸币的安全线信号与预置在储存器 20 中的该待测纸币类型的安全 线信号强度进行比较， 如果一致， 则说明待测纸币符合单张纸币的安全线信号强度要 求， 转到上述实施例中的步骤 S50; 如果不一致， 说明待测纸币不符合单张纸币的安 全线信号强度要求， 则转到上述实施例中的步骤 S74。 需要说明的是， 上述的步骤 S42和步骤 S44可以仅仅执行一个， 也可以两个均执 行， 在两个均执行时， 步骤 S42和步骤 S44的顺序是可变的。 由于安全线在每张纸币上的位置可以在一定范围内变化， 因此， 两张或两张以上 的纸币重叠时， 每张纸币的安全线难以完全重叠在一起， 因此， 通过获取待测纸币安 全线特征，使待测纸币的安全线特征与其对应类型的单张纸币的安全线特征进行对比， 从而可以判断纸币是否重张。 在本发明实施例中，可以通过安全线检测器 16检测到的安全线信号数量，判断安 全线数量。 比如， 某类型的单张纸币的安全线数量为一条， 当检测到多条安全线信号 时， 说明纸币重张， 如安全线检测器 16检测到图 7a中两个安全线信号 30、 32时， 可 以确定待检纸币至少有两条安全线 34、 36， 即至少是两张纸币重叠。 但是， 如果检测 到待测纸币安全线信号为一个时， 如安全线检测器 16检测到图 7b所示的信号 40， 并 不能确定待测纸币不重张， 原因是， 在极端情况下， 两张或两张以上的纸币重叠时， 其各自的安全线也可能完全重叠， 因此，还需要从安全线信号的强度判断安全线数量。 当检测到的待测纸币安全线信号数量和强度均与设定值一致时， 才能得到待测纸币安 全线数量与设定值一致。 受纸币新旧程度不同、 纸币版本不同的影响， 同一种类型纸 币的安全线检测信号强度变化会很大， 因此， 通过信号强度进行检测时误差较大。 通 常仅利用待测纸币的安全线信号数量判断其安全线特征是否符合单张纸币要求， 同时 利用对待测纸币其他特征的检测，排除两张或两张以上的纸币安全线完全重叠的情况。 下面结合图 6说明待测纸币的透射光强度是否符合光强度要求的判断方法， 该方 法包括： 步骤 S52， 计算加权平均值。 为降低透光性异常区域对待测纸币透光性的影响， 本步骤对步骤 S50检测的透射 光数据进行进一步处理， 求得透射光数据的加权平均值， 即加权平均值， 其中， 透光 性异常区域包括易透光区域 （如纸币的无图案或纹理区域） 和不易透光区域 （如安全 线、颜色比较明显的图案等），易透光区域、不易透光区域所对应光数据的权值比较小。 步骤 S54， 判断加权平均值是否大于光强度阈值。 由于纸币越厚透光性越差、 纸币越薄透光性越好， 因此通过能够反映纸币厚度的 加权平均值对待侧纸币是否符合光强度要求进行判断； 如果加权平均值大于预置在储 存器 20中的该纸币类型对应的光强度阈值，说明待测纸币的透射光强度符合单张纸币 的光强度要求， 则转到步骤 S72 (参见图 3 ); 如果加权平均值小于光强度阈值， 说明 待测纸币的透射光强度不符合单张纸币的光强度要求， 则转到步骤 S74 (参见图 3 )。 下面结合图 8a、 图 8b说明光强度阈值的确定方法。 由于纸币在使用一段时间以 后， 其表面粘连的灰尘使其透光程度下降， 因此， 旧币的透光性比新币差； 同时， 由 于纸币越厚透光性越差、 纸币越薄透光性越好， 因此， 单张纸币的透光性比两张纸币 的透光性高。 基于上述原理， 单张新币、 单张旧币、 两张新币、 两张旧币的透光性从 强到弱进行排列， 依次为单张新币、 单张旧币、 两张新币、 两张旧币。 因此， 如果设 定的光强度阈值能够区分出单张旧币和两张新币的透光性差异， 就能以光强度阈值为 参考判断出纸币是否重张。 由透射检测器 18中的红外光发射器沿着图 8a中所示方向 54照射待测纸币 50的 区域 52， 由红外光接收器接收透过纸币的照射光线， 输出纸币的透射光数据， 单张旧 币的红外透射光数据曲线为图 8b中的曲线 60， 两张新币的红外透射光数据曲线为图 8b中的曲线 62， 图 8b中， 横轴为纸币长度、 纵轴为透射光数据大小。 从曲线 60、 62 的波形可以看出， 虽然曲线 60上大部分数据大于曲线 62上的数据， 由于两个曲线有 交叉， 不能直接通过透射光数据的大小区分出两个曲线。 因此， 通过公式
A = wxxx, w = ( ≥0, = 1, ...,«μ十算透射光数据的加权平均值， 其中， Α表示 透射光数据的加权平均值， Xl表示透射光数据， Wl表示透射光数据 对应的权值， 所 有权值之和等于 1。 通过减小透射光数据的极大数据、 极小数据对应的权值， 从而降 低极大数据、 极小数据对加权平均值 A的影响。 如图所示， 曲线 60的加权平均值为 直线 64， 曲线 62的加权平均值为直线 66， 如图 8b所示， 直线 64、 66之间有一定的 距离， 可以利用直线 64、 66之间的直线 68来区分曲线 60、 62， 即直线 68所对应的 加权平均值即为判断透射光强度是否符合要求的光强度阈值。 如果待测纸币的加权平 均值在直线 68之上，表示待测纸币的加权平均值为单张纸币的加权平均值， 即待测纸 币为单张纸币； 如果待测纸币的加权平均值在直线 68之下，表示待测纸币的加权平均 值为两张或多张纸币的加权平均值， 即待测纸币为多张纸币。 由于两张或两张以上纸币重叠时引起纸币厚度增加， 通过获取待测纸币的加权平 均值， 使其与参考阈值进行对比， 从而判断纸币是否重张。 通过对纸币透射光数据进 行分析， 而不是直接对纸币厚度分析， 能够克服纸币介质老化、 粘有灰尘等对纸币厚 度检测结果的影响，保证了检测结果的可靠性。通过去除对透射光敏感的易透光区域、 对透射光不敏感的不易透光区域对应的扫描数据， 使透射数据平均值能准确地反映纸 币的厚度， 保证了检测结果的准确性。 纸币的图像尺寸检测、 安全线特征检测和透射光强度检测的执行顺序可以根据需 要设置。 当三者中任意一个检测结果不满足设定条件时， 说明待测纸币重张； 当三个 检测结果都满足设定条件时， 说明待测纸币为单张纸币。 由于多张纸币重叠时， 外形 不重叠、 安全线不重叠的概率较大， 因此， 首先判断待测纸币的外形尺寸或安全线特 征能够快速排除纸币是否重叠， 因此， 本发明实施例提供的检测顺序为优选的检测顺 序。 通过对待测纸币图像尺寸、 安全线特征和透射光强度的组合判断， 能够准确判断 纸币是否重叠， 克服了纸币使用状况、 纸币新旧程度对检测结果的影响， 提高了检测 的稳定性和可靠性。 本发明实施例还提供了一种自助终端， 如自助取款机、 自助存款机或自助售票机， 该自助终端具有上述任一实施例所提供的纸币重张的检测装置。 以上所述仅为本发明的优选实施例而已， 并不用于限制本发明， 对于本领域的技 术人员来说， 本发明可以有各种更改和变化。 凡在本发明的精神和原则之内， 所作的 任何修改、 等同替换、 改进等， 均应包含在本发明的保护范围之内。

Claims

权 利 要 求 书
1. 一种纸币重张的检测方法， 其特征在于， 包括：
对待测纸币的安全线进行检测， 得到安全线特征数据；
判断所述安全线特征数据是否符合第一预定条件； 以及
在所述安全线特征数据不符合第一预定条件的情况下， 判定所述待测纸币 存在重张。
2. 根据权利要求 1所述的方法， 其特征在于，
在对待测纸币的安全线进行检测之前， 所述方法还包括：
获取所述待测纸币的尺寸数据； 以及
根据所述待测纸币的尺寸数据判断所述待测纸币的尺寸是否符合第二预定 条件；
其中， 在所述待测纸币的尺寸不符合所述第二预定条件的情况下， 判定所 述待测纸币存在重张，在所述待测纸币的尺寸符合所述第二预定条件的情况下， 对所述待测纸币的安全线进行检测。
3. 根据权利要求 2所述的方法， 其特征在于， 获取所述待测纸币的尺寸数据包括： 对所述待测纸币进行扫描， 获取所述 待测纸币的扫描图像； 以及对所述扫描图像进行处理， 得到所述待测纸币的尺 寸数据，
根据所述待测纸币的尺寸数据判断所述待测纸币的尺寸是否符合所述第二 预定条件包括： 根据所述扫描图像得到所述待测纸币的纸币类型； 查找所述纸 币类型对应的基准尺寸， 其中， 所述基准尺寸包括基准长度和基准宽度； 以及 判断所述扫描图像的尺寸是否大于所述基准尺寸；
其中， 在所述扫描图像的尺寸不大于所述基准尺寸时， 判定所述待测纸币 的尺寸符合第二预定条件， 在所述扫描图像的尺寸大于所述基准尺寸时， 判定 所述待测纸币的尺寸不符合所述第二预定条件。
4. 根据权利要求 1所述的方法， 其特征在于， 所述安全线特征数据包括安全线数 量， 判断所述安全线特征数据是否符合第一预定条件包括： 判断所述安全线数量是否等于预设的数量； 以及
在所述安全线数量等于预设的数量时， 判定所述安全线特征数据符合所述 第一预定条件。
5. 根据权利要求 1所述的方法， 其特征在于， 所述安全线特征数据包括安全线信 号强度， 判断所述安全线特征数据是否符合第一预定条件包括：
判断所述安全线信号强度是否与预设安全线信号强度一致； 以及 在所述安全线信号强度与所述预设安全线信号强度一致时， 判定所述安全 线特征数据符合所述第一预定条件。
6. 根据权利要求 1所述的方法， 其特征在于， 在所述安全线特征数据符合所述第 一预定条件的情况下， 所述方法还包括：
对所述待测纸币进行照射， 获取所述待测纸币的透射光数据； 判断所述透射光数据是否符合第三预定条件； 以及
在所述透射光数据不符合第三预定条件的情况下， 判定所述待测纸币存在 重张。
7. 根据权利要求 6所述的方法， 其特征在于， 对所述待测纸币进行照射， 获取所述待测纸币的透射光数据包括： 对所述 待测纸币不同的区域进行照射， 获取所述不同区域待测纸币的透射光数据； 以 及对所述不同区域待测纸币的透射光数据进行加权平均， 得到所述透射光数据 的加权平均值，
判断所述透射光数据是否符合第三预定条件包括： 判断所述透射光数据的 加权平均值是否符合所述第三预定条件。
8. 一种纸币重张的检测装置， 其特征在于， 包括：
安全线检测器，用于对待测纸币的安全线进行检测，得到安全线特征数据; 存储器， 用于存储所述待测纸币的基准数据； 以及
处理器， 用于根据所述基准数据判断所述安全线特征数据是否符合第一预 定条件， 以及在所述安全线特征数据不符合第一预定条件的情况下， 判定所述 待测纸币存在重张。
9. 根据权利要求 8所述的装置， 其特征在于， 还包括： 获取机构， 用于获取所述待测纸币的尺寸数据，
其中， 所述处理器还用于根据所述基准数据判断所述尺寸数据是否符合第 二预定条件， 在所述待测纸币的尺寸不符合所述第二预定条件的情况下， 判定 所述待测纸币存在重张， 以及在所述待测纸币的尺寸符合预定条件的情况下， 控制所述安全线检测器对所述待测纸币的安全线进行检测。
10. 根据权利要求 8所述的装置， 其特征在于， 还包括透射光检测器， 该透射光检 测器包括：
光发射器， 用于发射光以照射所述待测纸币； 以及
光接收器， 用于接收透过所述待测纸币的光线并输出透射光数据， 其中， 所述处理器还用于判断所述透射光数据是否符合第三预定条件； 以 及在所述透射光数据不符合第三预定条件的情况下， 判定所述待测纸币存在重 张。
11. 一种自助终端，其特征在于，包括权利要求 8至 10中任一项所述的纸币重张的 检测装置。
12. 根据权利要求 11所述的自助终端，其特征在于，所述自助终端为自动出纳机或 者自动售票机。
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