JP2010198066A - Paper sheet discrimination device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a paper sheet discrimination device for discriminating paper sheets included in a counterfeit bill region as counterfeit bill without treating bills other than genuine bill as counterfeit bills when determining authenticity of paper sheets. <P>SOLUTION: Featured values are calculated for each detection item. As for a reflection detection device, featured values are calculated by a featured value calculation part 41b on the basis of a reflection image detected by the reflection detection part 10. A reflection detection genuine bill distribution 60a and a reflection detection counterfeit bill distribution 60b1 based on a plurality of featured values calculated from a plurality of paper sheets are statistically generated. Also, a margin region is arranged between the reflection detection genuine bill distribution 60a and the reflection detection counterfeit bill distribution 60b1, and a reflection detection genuine bill region 60c for determining genuine bill and a reflection detection counterfeit bill region 60d1 for determining counterfeit bill are set on the basis of the distribution. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a paper sheet discriminating apparatus that is mounted on a paper sheet processing apparatus that sorts paper sheets such as securities, and discriminates the paper sheets.

  The paper sheet processing apparatus for processing paper sheets such as securities moves to the take-out position of the paper sheet bundle that is collectively supplied to the supply unit, and starts from the uppermost sheet of the paper sheet bundle. One sheet is taken out and conveyed one by one, and the paper sheet discriminating apparatus discriminates the type (ticket type), authenticity, correctness and conveyance direction of the paper sheet, and the paper sheet is based on the discrimination result. It is a device that performs sorting processing such as accumulation by an accumulation device.

  Paper sheets that have been determined to be fake by the paper sheet discriminating device are accumulated in the rejected ticket storage together with other paper sheets that have been classified as indistinguishable tickets.

  The indistinguishable ticket includes a transport abnormality ticket such as a two-sheet pickup ticket, a misalignment ticket, and a skew ticket, a fouling ticket such as a torn ticket or a folded ticket, and the fake ticket described above. In order to prevent false detection due to reasons such as the fact that the detection error range is not sufficiently secured even if the conveyance abnormality ticket or the stain ticket is a genuine note, it is treated as an exclusion ticket.

  Although this kind of paper sheet leaf type discriminating apparatus has already been put into practical use, there is an improvement in the performance of a copying machine or the like, and an elaborate counterfeit note may be manufactured. In particular, when a new counterfeit ticket is discovered, it may be extremely difficult to determine whether the counterfeit ticket is classified as a genuine note by the paper sheet discriminating device, and the issued counterfeit ticket is classified as a genuine note. Individual correspondence is done for this purpose. As a general authenticity detection method, a method is known in which the type of paper sheet is determined, a detection target part is determined, the part is irradiated with an optical detector, and the reflected light is determined. (For example, refer to Patent Document 1).

Japanese Patent Laying-Open No. 2003-288629 (page 5-6, FIG. 4)

  As described above, the conventional authenticity determination method of the paper sheet determination apparatus has a problem in that individual correspondence is required every time a new counterfeit is discovered. In addition, the way of thinking about counterfeit tickets is not a way of catching counterfeit tickets, but other than genuine tickets are positioned as the indistinguishable tickets described above, and counterfeit tickets are positioned within the concept of being one of them. , We do not actively detect counterfeit bills, so what range of counterfeit bills are distributed with respect to genuine bills and whether there is sufficient margin between genuine bills and counterfeit bills There was a problem that confirmation could not be taken sufficiently.

  The present invention has been made to solve the above problems, and detects the distribution of counterfeit bills in a form that is compared to the distribution of genuine bills, and reliably detects that counterfeit bills are included in the counterfeit bill distribution. Accordingly, an object of the present invention is to provide a paper sheet discriminating apparatus that detects a counterfeit ticket as a counterfeit ticket rather than as an indistinguishable ticket.

  In order to achieve the above object, a paper sheet discriminating apparatus according to claim 1 of the present invention discriminates authenticity of a detection means for detecting a paper sheet being conveyed and a detection result detected by the detection means. A paper sheet discriminating apparatus comprising: a true / false discriminating means, wherein the true / false discriminating means stores a pattern information storage means for storing pattern information when a paper sheet is detected by the detecting means; A feature amount calculating unit that calculates a feature amount based on pattern information stored in the information storage unit, and a distribution is generated by statistically processing the feature amount calculated by the feature amount calculating unit, and the distribution is Discrimination level setting means for setting a discrimination level for discriminating paper sheets based on the discrimination level storage means for storing the discrimination level set by the discrimination level setting means, and the feature amount calculated by the feature amount calculation means Before Authenticity discrimination means for discriminating based on the discrimination level stored in the discrimination level storage means, and the authenticity discrimination means is used when the paper sheet is included in the genuine note area recorded in the discrimination level. It is discriminated as a genuine note, and when a paper sheet is included in a false ticket area, it is determined as a false ticket.

  By detecting the distribution of counterfeit bills in comparison with the distribution of genuine bills and detecting that the counterfeit bills are included in the distribution range of the counterfeit bills, the counterfeit bills are detected not as indistinguishable but as counterfeits. An object of the present invention is to provide a paper sheet discrimination device.

Reflection detection device constituting paper sheet discrimination device according to one embodiment of the present invention FIG. 3 is a block diagram for explaining the flow of processing when image data output from the reflection detection device shown in FIG. 1 is processed by a processing device. Diagram showing the distribution of genuine and fake tickets The distribution chart concerning O-X1 of the reflection detection genuine note distribution and the reflection detection counterfeit distribution regarding the reflection detection shown in FIG.

  The paper sheet discriminating apparatus of the present invention is used by being mounted on a paper sheet processing apparatus for processing securities such as a banknote processing apparatus, a banknote inspection machine or a banknote sorting machine, and is provided in the paper sheet processing apparatus. Paper sheets conveyed by the apparatus at a predetermined interval are detected by various detection means by a contact method or a non-contact method. In the present embodiment, a paper sheet discriminating apparatus is shown in which a detected medium is detected by a non-contact method by a reflection detecting device therein, and the detected data is discriminated by a discrimination unit according to the present invention.

  FIG. 1 shows an embodiment of a reflection detection device 110 constituting the paper sheet discrimination device 100 of the present invention. The paper sheet discriminating apparatus 100 is composed of a plurality of detection means, and discriminates paper sheets based on a plurality of detection items provided for each. The detection means includes, for example, a shape detection device, a fluorescence detection device, a reflection detection device 110, a transmission detection device, a magnetic detection device, a thickness detection device, and other feature amount detection devices. The paper sheet discriminating apparatus 100 comprehensively determines the detection results of these detection apparatuses, performs ticket type determination, authenticity determination, and correctness determination, and transmits the determination results to a conveyance control unit (not shown). To do.

  The conveyance control unit performs switching control of the sorting gate provided in the conveyance path so as to convey the paper sheet to the final processing unit based on the received determination result.

  The paper sheets are transported by a transport path switched by a sorting gate, and are sorted and accumulated in each stacking unit of a correct ticket, a damaged ticket, or a rejection ticket. The paper sheets accumulated in each stacking unit are subjected to post-processing such as bundling and discharging every 100 sheets, for example, but since this is not the gist of the present invention, detailed description thereof is omitted. Hereinafter, a case where the detection result of the reflection detection device 110 is used for true / false detection will be described as an example.

  The reflection detection device 110 includes a standard reflection plate 20, an optical detection unit 30, a lamp 35, a determination unit 40, and the like.

  The reflection detection device 110 configured as described above is arranged in the conveyance path 50 provided in the paper sheet processing apparatus 100.

  The conveyance path 50 includes conveyance rollers 51a, 51b, 52a, and 52b and conveyance belts 50a, 50b, and 50c wound around the conveyance rollers 51a, 51b, 52a, and 52c, and a sheet P that is a detection medium is sandwiched between the conveyance belts. Transport in the direction of arrow A in the figure. The illustrated example shows a case where the upper surface conveyance belts 50 b and 50 c of the paper sheet P sandwiching the paper sheet P are prevented from entering the detection visual field of the optical detection unit 30.

  The lamp 35 irradiates the detection surface 36. The lamp 35 is a lamp that emits light having an optimum wavelength depending on the pattern of the paper sheet P and the characteristics of the printing ink. Therefore, depending on the characteristics of the printing ink on the paper sheet, a filter (not shown) may be disposed between the lamp 35 and the detection surface 36, and unnecessary wavelengths may be cut by this filter.

  The optical detection unit 30 includes a lens 31, a filter 32, a camera 33, and the like. The reflected light from the detection surface 36 irradiated by the lamp 35 is collected by the lens 31, and a line sensor 33 a provided inside the camera 33. Detect by such as. As illustrated, the filter 32 disposed between the lens 31 and the camera 33 has an effect of cutting unnecessary light in the reflected light reflected from the paper sheet P.

  The line sensor 33a is composed of a CCD (Charge Coupled Device) sensor or the like disposed in the depth direction (main scanning) intersecting the transport direction, and a detection output (image) obtained by scanning at a predetermined speed in the main scanning direction. Data) is stored in the image memory 38.

  The determination unit 40 is a kind of microcomputer system and includes a memory 41 and a processor (CPU) 42. Reflected image data for one line read by the camera 33 is stored in the image memory 38. When the paper sheet P is conveyed, the reflected image data of the entire range of the paper sheet P is stored in the image memory 38. Remembered. The image data stored in this way is processed by the CPU 42 of the determination unit 40.

  FIG. 2 is a block diagram for explaining the flow of processing when the discrimination unit 40 processes the reflected image data output from the reflection detection unit 10 shown in FIG.

  The reflection image data output from the reflection detection unit 10 is stored in the memory 41. The memory 41 also stores images output from other detection devices. Based on the reflection image data output from the reflection detection unit 10 of the present embodiment, pattern information set by a combination of color data set in advance is generated and stored in the pattern information storage unit (pattern information storage unit) 41a. Is done.

  The feature amount calculation unit (feature amount calculation means) 41b calculates a feature amount based on the pattern information generated by the pattern information storage unit 41a. The paper sheet processing apparatus according to the present embodiment supplies and processes a paper sheet whose ticket type and transport direction are specified in advance for operation to a supply unit (not shown). A detection range (area) for detecting the feature of the paper sheet based on the direction is set, and the feature amount of the detection area is calculated.

  For example, in the case of a front / front (surface / upright state) of the paper sheet, a code identifying the ticket type is printed on the left side, and a person image indicating the characteristics of the ticket type is printed on the right side. The detection area and the detection color to be detected are set. In this case, a detection range suitable for detecting the feature amount printed on the left and right is set, suitable for detecting the code and the person image, and separated from other ticket types. A suitable detection color or a detection color generated by calculating R (red), G (green), B (blue) and IR (infrared) is set.

  The detection area and the detection color described above are set in advance based on the genuine ticket data collection result and, if possible, the false ticket data collection result.

  The authenticity determination unit 41e compares the feature amount data generated by the feature amount calculation unit 41b with the determination level set by the determination level setting unit 41c and stored in the determination level storage unit 41d. As a result of this comparison, if it is included in the genuine note area, it is determined as a genuine note, and if it is included in the false ticket area, it is determined as a false ticket.

  The above processing is performed in an online process for taking out and discriminating each sheet supplied to the supply unit by the sheet processing apparatus.

  On the other hand, the discrimination level is set by the discrimination level setting unit 41c. The discrimination level setting unit 41c conveys the paper sheets prepared for setting the discrimination level of the paper sheets, and the feature amount data generated by the feature amount calculation unit from the transported paper sheets Is collected and its distribution is generated. A genuine note discrimination level is set for the generated distribution. Hereinafter, the determination level setting method will be described in detail with reference to FIG.

  FIG. 3 is a diagram schematically illustrating the distribution of genuine bills and counterfeit bills. The paper sheet discrimination device 100 includes a reflection detection device 110, a transmission detection device, a magnetic detection device, a fluorescence detection device, and other feature amount 1 detection device / feature amount detection 2 device.

  In each of these detections, the pattern information corresponding to each detection is stored in the information storage unit, the feature amount is calculated by the feature amount calculation unit, and becomes one of the detection items. The distribution of these feature quantities is as shown in the figure. For example, the reflection detection genuine note distribution 60 a is generated from the true note distribution of the feature amount created by the feature amount calculation unit by the reflection detection device 110. Similarly, a transmission detection genuine note distribution 61a is generated from the genuine note distribution by the transmission detection device. Hereinafter, similarly, a magnetic detection genuine note distribution 62a, a fluorescence detection genuine note distribution 63a, a feature amount 1 detection genuine note distribution 64a, a feature amount 2 detection genuine note distribution 65a, and the like are generated.

  These exist inside a circle 100a indicating a genuine note area. On the other hand, the counterfeit bills for the genuine note area 100a are located outside the circle 100a indicating the genuine note area, and the reflection detection counterfeit distribution 60b1, the transmission detection counterfeit distribution 61b, the magnetic detection counterfeit distribution 62b, and the fluorescence detection counterfeit. A distribution 63b, a feature quantity 1 detection counterfeit distribution 64b, a feature quantity 2 detection counterfeit distribution 65b, and the like are generated.

  FIG. 4 is a distribution diagram relating to the cross-section O-X1 of the reflection detection genuine note distribution 60a and the reflection detection counterfeit distribution 60b1 shown in FIG. The vertical axis represents the frequency, and the horizontal axis represents the extent of the region. In this distribution chart, the genuine note is included in the reflection detection genuine note region 60c, and the false ticket is included in the reflection detection false note region 60d1.

  Here, a margin area is set between the reflection detection genuine note area 60c and the reflection detection false note area 60d1. If this margin area is sufficiently secured, the reliability of the true / false discrimination result is increased, and if this margin area cannot be sufficiently secured, the reliability of the true / false discrimination result is lowered.

  The present embodiment is characterized in that a margin area is secured between the reflection detection genuine note area 60c and the reflection detection false note area 60d1. In the discrimination level setting unit 41c, when the paper sheet conveyed for setting the discrimination level is a genuine note, the feature amount in the feature amount calculation unit 41b of the genuine note is set to the set reflection detection genuine note region 60c. If it is not included, the data for setting the discrimination level is not included, and only the data included in the reflection detection genuine note area 60c is added to the reflection detection genuine note distribution 60a to perform statistical processing. On the other hand, when the feature amount calculation unit 41b of the counterfeit note does not include the feature amount in the reflection detection counterfeit region 60d1, it is not included in the data for setting the counterfeit ticket discrimination level. The purpose is not to collect data on genuine or fake tickets that lack authenticity as counterfeit data.

  For example, when many of the original reflection detection counterfeit area 60d1 exceeds the range of the reflection detection counterfeit area 60c due to the subsequent generation of the counterfeit, the shift to the illustrated reflection detection counterfeit area 60d2 is performed. There is a need. In that case, the counterfeit ticket discrimination level is also shifted accordingly. In the case of the illustrated example, the counterfeit ticket determination level lower limit CLL1 to the counterfeit ticket determination level upper limit CUL1 are shifted to the counterfeit ticket determination level lower limit CLL2 to the counterfeit ticket determination level upper limit CUL2, respectively.

  Note that the genuine note discrimination level lower limit FLL1 to the true note discrimination level upper limit FUL1 is processed in the same way as the shift of the false note discrimination level when the true note distribution is shifted. Normally, most of the paper sheets processed by the paper sheet processing apparatus are genuine bills. Therefore, the statistical processing of the genuine bill discrimination processing is performed in the above-described online processing, and the authenticity is determined based on the result. Ticket discrimination level shift is possible.

  Since the determination level setting means determines the authenticity based on a plurality of detection items by the plurality of detection means constituting the paper sheet determination means, the setting by updating the authenticity determination level related to the one detection item is performed. When performing, when all of the plurality of detection items are included in the genuine note area, setting by updating the discrimination level by adding the feature amount of the paper sheet related to the one detection item to the distribution of the feature amount It can be performed.

  According to this method, for example, in the case of the reflection detection device, if the result of the determination of the paper sheet as the detected medium is not a genuine note by magnetic detection, the reflection detection of the paper sheet is performed. Such a genuine note discrimination level can not be updated. This method has the effect of increasing the accuracy of true / false discrimination, but on the other hand, the number of rejected tickets may increase in order to moderately update the discrimination level. Therefore, this method is effective when a margin provided between the paper sheet to be processed and the counterfeit is sufficiently obtained.

  On the other hand, if a counterfeit ticket is found online and it is included in the reflection detection counterfeit area, it can be determined as a counterfeit ticket, but it is not a counterfeit but is not included in the counterfeit area. In this case, for example, it may be a genuine sheet that cannot be identified due to stains, or a new counterfeit ticket may be discovered. To.

  Paper sheets that have been treated as rejection tickets are reprocessed. As a result of processing at this time, for example, although it is a genuine note, paper sheets with abnormal conveyance such as picking two sheets, conveyance pitch clogging, conveyance position shift, folding, etc., may be processed normally by reprocessing. high.

  As described above, according to the paper sheet discriminating device of the present invention, it is possible to discriminate genuine bills as genuine bills and discriminate fake bills as fake bills, providing a highly reliable authenticity discriminating device. be able to.

  In the present embodiment, the reflection detection device is described as the detection means constituting the paper sheet discrimination device, but the detection unit for detecting the paper sheet is different even in other detection devices. Although the data is different, the essential idea can be applied to other detection devices.

DESCRIPTION OF SYMBOLS 10 Reflection detection apparatus 30 Optical detection part 40 Discrimination part 50 Conveyance path 60a Reflection detection genuine note distribution 60b1, 60b2 Reflection detection false note distribution 60c Reflection detection genuine note area 60d1, 60d2 Reflection detection false note area 100 Paper sheet discrimination apparatus 110 Reflection Detection device

Claims (3)

A paper sheet discriminating apparatus comprising: a detecting unit that detects a conveyed paper sheet; and a true / false determining unit that determines whether the detection result detected by the detecting unit is true or false.
The authenticity determination means includes
Pattern information storage means for storing pattern information when paper sheets are detected by the detection means;
Feature quantity calculating means for calculating a feature quantity based on the pattern information stored in the pattern information storage means;
A discrimination level setting unit that generates a distribution by statistically processing the feature amount calculated by the feature amount calculation unit, and sets a discrimination level for discriminating a paper sheet based on the distribution;
Discrimination level storage means for storing the discrimination level set by the discrimination level setting means;
Authenticity determination means for determining the feature amount calculated by the feature amount calculation means based on the determination level stored in the determination level storage means;
With
The authenticity determination means determines that the paper sheet is a genuine note when the paper sheet is included in the genuine note area recorded at the determination level, and determines that the paper sheet is a false ticket when the paper sheet is included in the false ticket area. Paper sheet discriminating device characterized by the above. The discrimination level setting means includes
A feature amount is calculated by the feature amount calculation means based on the pattern information detected by the detection means by transporting a plurality of paper sheets, and a distribution of the calculated feature amount is generated. When updating the discrimination level, if the feature quantity of the paper sheet is included in the genuine note area, it is newly added to the distribution of the feature quantity, and the feature quantity of the paper sheet is included in the genuine note area. If not, a paper sheet discriminating apparatus that calculates a genuine note area without adding to the distribution of the feature amount. The discrimination level setting means includes
When the paper sheet discriminating apparatus determines the authenticity by a plurality of detection items by a plurality of detection means and performs setting by updating the authenticity determination level related to the one detection item, all of the plurality of detection items are true. 2. The setting according to claim 1, wherein, when included in the ticket area, setting by updating the discrimination level is performed by adding the feature amount of the paper sheet related to the one detection item to the distribution of the feature amount. Paper sheet discrimination device.

Images