JP3921073B2 - Paper sheet identification device - Google Patents

Paper sheet identification device Download PDF

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Publication number
JP3921073B2
JP3921073B2 JP2001335680A JP2001335680A JP3921073B2 JP 3921073 B2 JP3921073 B2 JP 3921073B2 JP 2001335680 A JP2001335680 A JP 2001335680A JP 2001335680 A JP2001335680 A JP 2001335680A JP 3921073 B2 JP3921073 B2 JP 3921073B2
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Japan
Prior art keywords
unit
paper sheet
image data
unevenness
identification
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Expired - Fee Related
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JP2001335680A
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Japanese (ja)
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JP2003141595A (en
Inventor
宏 中村
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日本電産サンキョー株式会社
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Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a paper sheet identification apparatus. More specifically, the present invention relates to a paper sheet identification device that detects features on the surface of a paper sheet and determines the authenticity of the paper sheet or the type of the paper sheet based on the result.
[0002]
[Prior art]
As a countermeasure against counterfeiting of paper sheets, there is an apparatus for identifying a paper sheet by detecting a pattern of the paper sheet, magnetic ink, a security thread, and the like. Conventional paper sheet identification devices adopt an optical method that detects the intensity distribution of light reflection or transmission of printing, a magnetic method that detects the concentration distribution of printing magnetic ink, or a combined optical / magnetic method. It is general (refer to JP-A-10-302111, JP-A-3-209594, etc.).
[0003]
[Problems to be solved by the invention]
However, the conventional paper sheet identification device has the following problems.
[0004]
With optical detection methods that read printed patterns and color patterns on paper sheets, counterfeit tickets created using replication technology such as color copiers and color printers that have become more sophisticated in recent years may be accepted as genuine tickets. is there. In addition, since it is necessary to form an optical system including a light projecting mechanism and a light receiving mechanism, there are disadvantages that the adjustment of the optical system is complicated, mechanically bulky, the mechanism is complicated, and the cost of manufacturing and operating the apparatus is high. . On the other hand, the magnetic detection method has a drawback that the number of detection channels needs to be increased in order to improve accuracy, and the structure of the head becomes complicated.
[0005]
SUMMARY OF THE INVENTION An object of the present invention is to provide an inexpensive paper sheet identification apparatus that can eliminate counterfeit paper sheets copied by a color copier or a color printer.
[0006]
[Means for Solving the Problems]
In order to achieve such an object, the paper sheet identification device according to claim 1 is smaller than the identification object on the surface of the paper sheet. Causes a charge change corresponding to the unevenness of the identification target The temperature distribution of the air layer between the object to be identified and the heat sensitive element due to the height / depth of the unevenness of the object to be identified, which is composed of an array of heat sensitive elements Due to the charge change of the thermal element An unevenness detection unit that detects and converts into electrical signals and outputs partial image data to be identified, an image storage unit that stores partial image data, and partial image data stored in the image storage unit An image construction unit that combines and constructs image data of the entire identification target, a feature extraction unit that extracts the uneven pattern of the identification target based on the constructed image data, the extracted uneven pattern, and a predetermined criterion A pattern comparison unit that compares the pattern and a determination unit that determines the authenticity of the paper sheet or the type of the paper sheet based on the result of the pattern comparison unit are provided.
[0007]
Therefore, the unevenness pattern by the printing ink or the like to be identified is detected as a two-dimensional image by the unevenness detection unit, and the features of the uneven pattern in the identification target are extracted by image processing by the image construction unit and the feature extraction unit. Here, a color copier or a color printer cannot faithfully imitate the information on the unevenness of the printing ink on the paper sheet surface. Therefore, if the paper sheet to be measured is a counterfeit ticket duplicated by a color copier or a color printer, the uneven image of the counterfeit ticket is clearly different from that of the genuine ticket. This difference can be reliably detected by the pattern comparison unit, and forged paper sheets duplicated by a color copier or a color printer can be reliably excluded. In addition, since the present invention does not require an optical system, the device mechanism can be simplified and no complicated adjustment is required. Furthermore, since the image construction unit is provided in the present invention, the unevenness detection unit can classify and detect the identification target, and can employ an unevenness detection unit that is smaller than the identification target on the surface of the paper sheet. Therefore, the identification device can be reduced in size and simplified, and the cost can be reduced.
[0008]
According to a second aspect of the present invention, in the paper sheet identification apparatus according to the first aspect, a heating unit for heating the unevenness detecting unit, a temperature detecting unit for detecting the temperature of the unevenness detecting unit, and a temperature detection And a temperature adjusting unit that adjusts the heating unit so that the target temperature is set in advance based on the result of the unit. In this case, the unevenness detection unit can be operated under optimum conditions, and paper sheets can be identified under the same temperature conditions as when the reference pattern was measured. Thereby, the accuracy of the identification device can be further increased.
[0009]
According to a third aspect of the present invention, in the paper sheet identification device according to the first or second aspect, the display device displays a result of the determination unit and is stored in a portable case body. . In the present invention, since an optical system is not required, the device mechanism can be simplified, and a small unevenness detection unit can be adopted for the identification target on the surface of the paper sheet, so that the paper sheet identification device can be made portable. Can be configured. In this case, the authenticity of the paper sheet or the type of the paper sheet can be easily checked without taking up space.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the configuration of the present invention will be described in detail based on embodiments shown in the drawings.
[0011]
1 to 13 show an embodiment of a paper sheet identification device of the present invention. This paper sheet identification device 1 is composed of an array of thermal elements so as to be smaller than the identification object 13 on the surface of the paper sheet 12, and detects the height / depth of the unevenness of the identification object 13 to detect electricity. The unevenness detection unit 2 that converts the signal into a signal and outputs partial image data of the identification target 13, the image storage unit 3 that stores the partial image data, and the partial image data stored in the image storage unit 3 An image construction unit 4 that composes image data of the entire identification target 13 by combining, a feature extraction unit 5 that extracts the concave / convex pattern of the identification target 13 based on the constructed image data, and the extracted concave / convex pattern. A pattern comparison unit 6 that compares the reference pattern and a determination unit 7 that determines the authenticity of the paper sheet 12 or the type of the paper sheet 12 based on the result of the pattern comparison unit 6 are provided. .
[0012]
Here, the identification target 13 on the surface of the paper sheet 12 is all or part of the surface of the paper sheet 12 to be detected by the unevenness detection unit 2. The identification target 13 is preferably a part of the paper sheet 12 that is sufficiently smaller than the entire paper sheet 12 from the viewpoint of downsizing the unevenness detecting unit 2 and shortening the processing time required for identification. In order to discriminate the type and authenticity of the class 12 well, it is preferably a characteristic part. If the identification object 13 is illustrated, for example, if it is a banknote, an amount display part etc. correspond.
[0013]
The surface of the paper sheet 12 has slight irregularities (that is, undulations and depressions) due to printing. The unevenness detection unit 2 detects the unevenness. The unevenness detection unit 2 is configured as an integrated circuit having an array of sensitive elements that cause a charge change corresponding to the unevenness. As the sensitive element, for example, a pyroelectric (thermal) element, a piezoelectric element, or a combination thereof is used. The unevenness detection unit 2 of the present embodiment is assumed to have an array of thermal elements. The air layer between the unevenness detection unit 2 and the paper sheet 12 to be measured has a temperature distribution due to the height / depth of the unevenness on the surface of the paper sheet 12. The unevenness detector 2 detects the temperature distribution and generates a corresponding electrical signal. This electric signal corresponds to the unevenness due to printing of the paper sheet 12 facing the unevenness detecting unit 2, and thus becomes image data of the paper sheet 12 facing the unevenness detecting unit 2. Note that, instead of or in addition to the thermal element, a piezoelectric element may be used to convert a pressure pattern corresponding to the unevenness on the surface of the paper sheet 12 into an electrical signal to obtain image data.
[0014]
Here, it is preferable that the unevenness detection unit 2 is made as small as possible in order to reduce the manufacturing cost and to reduce the size of the entire identification device 1. In the present invention, since the image constructing unit 4 is provided, the unevenness detecting unit 2 does not need to detect the entire area of the identification target 13 at a time, and can move and classify the identification target 13 for detection. That is, the unevenness detection unit 2 can be configured smaller than the identification target 13 on the surface of the paper sheet 12.
[0015]
An example of the size of the unevenness detection unit 2 will be described with reference to FIG. It is assumed that the maximum length in the longitudinal direction of the region of the identification target 13 is L and the maximum length in the direction orthogonal to the longitudinal direction is H. The relative movement direction V between the unevenness detection unit 2 and the paper sheet 12 is parallel to the longitudinal direction of the identification target 13. In FIG. 7, for convenience of explanation, the unevenness detection unit 2 is illustrated as moving on the paper sheet 12. It is preferable that the length H ′ of the unevenness detection unit 2 in a direction orthogonal to the V direction is slightly larger than H. In this case, it is possible to obtain image data of the entire identification target 13 only by relatively moving the unevenness detecting unit 2 and the paper sheet 12 in one direction (V direction). On the other hand, the length L ′ in the V direction of the unevenness detector 2 is much smaller than L. This is because the image constructing unit 4 may construct the image data of the entire identification target 13 by joining the pieces of image data. Here, the length L ′ is preferably set so that, for example, there are overlapping portions in two consecutive image data in order to improve the reliability of image construction. For example, it is preferable that overlapping portions of about 5 or 6 rows exist when a set of sensitive elements in the L ′ direction in the unevenness detection unit 2 is a column and a set of sensitive elements in the H ′ direction is a row. In determining specific L ′, for example, the size of the sensitive element of the unevenness detection unit 2, the relative speed of the paper sheet 12 with respect to the unevenness detection unit 2, the number of image data per second that can be transmitted by the unevenness detection unit 2, The optimum value can be selected in consideration of the processing speed of the image construction (the efficiency of the image construction algorithm, the processing speed of the arithmetic device, etc.). However, when the relative speed between the unevenness detection unit 2 and the paper sheet 12 is constant, or when the image construction algorithm is compatible, there is no need to overlap two consecutive image data. In some cases, the unevenness detection unit 2 may be configured by a single line of sensitive elements. For example, the size of the unevenness detection unit 2 of the present embodiment is set such that L ′ is about 0.4 mm and H ′ is about 14 mm.
[0016]
As illustrated in FIG. 6, the integrated circuit constituting the unevenness detector 2 includes, for example, an upper electrode 32, a lower electrode 28, and a pyroelectric material (or piezoelectric material) disposed between the upper electrode 32 and the lower electrode 28. An active layer 30 made of a material), a protective layer 34 formed on the upper electrode 32 and serving as a contact portion with the paper sheet 12, a semiconductor substrate 20 on which the lower electrodes 28 are arranged in a matrix, an active layer And a circuit 22 formed in the semiconductor substrate 20 for processing charges generated by the semiconductor substrate 20.
[0017]
The circuit 22 is, for example, a CCD (charge coupled device acting by charge transfer) circuit or a C-MOS circuit, and is manufactured by using a known or new manufacturing technique for an integrated circuit made of silicon. The circuit 22 is covered with a planarization layer 24, which is a polyimide layer having a thickness of several micrometers formed by, for example, spin coating. The planarization layer 24 is periodically etched so that each individual lower electrode 28 is connected to the corresponding circuit 22 in the semiconductor substrate 20 through the opening 26. The active layer 30 may be continuously formed on the matrix of the lower electrodes 28 as illustrated in FIG. This is because by arranging the plurality of lower electrodes 28 in a matrix arrangement, even if the active layer 30 is continuous, an arrangement of sensitive elements is formed. As the material of the active layer 30, a known or novel pyroelectric material (or piezoelectric material) can be used. For example, polyvinylidene chloride fluoride (PVDF), polyvinylidene chloride fluoride-trifluoroethylene (PVDF- TrFE), polyvinylidene chloride cyanide-vinyl acetate (PVDCN-VAc), polyvinylidene chloride cyanide-vinylidene fluoride (PVDCN-VDF) and the like are suitable. The protective layer 34 is, for example, a polyimide layer having a thickness of about 10 micrometers, and is formed so as to accurately transmit a temperature pattern (or pressure pattern) exerted on the protective layer 34 to a lower layer.
[0018]
The unevenness detection unit 2 is connected to the image transfer unit 11 in order to transmit an electric signal representing an image of a temperature pattern (or pressure pattern) exerted on the active layer 30 to a CPU (Central Processing Unit) 15. . The image transfer unit 11 is a known or new electronic circuit for connecting the CPU 15 and a sensor (unevenness detection unit 2), for example.
[0019]
The image storage unit 3 is for sequentially storing partial image data sent from the unevenness detection unit 2 via the image transfer unit 11, and is, for example, a RAM (Random Access Memory) provided in the CPU 15. On the other hand, the image construction unit 4 is realized, for example, by previously storing a program describing an algorithm for image construction in a ROM (Read Only Memory) provided in the CPU 15 and executing the program by the CPU 15. For example, the image construction unit 4 of the present embodiment performs the following processing.
[0020]
As shown in FIG. 8, it is assumed that the unevenness detection unit 2 and the paper sheet 12 are relatively moved in the V direction in a state where the unevenness detection unit 2 is in contact with the end of the identification target 13 on the paper sheet 12. In FIG. 8, for convenience of explanation, the unevenness detection unit 2 is illustrated as moving on the identification target 13. However, of course, the paper sheet 12 may be moved with respect to the stationary unevenness detecting unit 2. FIG. 8 shows the position of the unevenness detector 2 on the identification target 13 at times t0, t1, t2,..., Tn. The unevenness detection unit 2 outputs partial image data I0, I1, I2, ..., In of the identification target 13 at each time t0, t1, t2, ..., tn. Here, for example, in the present embodiment, the relative speed between the unevenness detection unit 2 and the paper sheet 12 is set so that continuous image data partially overlaps. For example, the image data I0 partially overlaps with the image data I1, the image data I1 partially overlaps with the image data I2, and so on. The image data I0, I1, I2,..., In are stored in the image storage unit 3.
[0021]
On the other hand, at the time when the image data I0 and the image data I1 are stored in the image storage unit 3, the image construction unit 4 starts a process for creating the composite image data Ir1 of the image data I0 and the image data I1. For this reason, the image construction unit 4 first estimates an overlapping portion between the image data I0 and the image data I1. For example, the image construction unit 4 continuously tries all cases in which the image data I0 and the image data I1 may overlap, assigns a correlation coefficient to each attempt, and the image data I0 and the image data I1 overlap. Estimate the optimal case. Known or novel mathematical methods for the correlation coefficient can be used for the processing of the image construction unit 4.
[0022]
FIG. 9 shows a first attempt to superimpose two image data I0 and I1. The superimpose position in FIG. 9 is P1. For example, the image construction unit 4 compares the levels (output values) of the sensitive elements of the image data I0 and I1 arranged at the same point in the common area Z0 in P1. As a result of the comparison, when the number of sensitive elements having substantially the same level is smaller than a predetermined value, the image construction unit 4 corrects the position of the superimpose to P2 shown in FIG. Then, the image construction unit 4 compares the levels (output values) of the sensitive elements of the image data I0 and I1 arranged at the same point in the common area Z1 in P2. As a result of the comparison, when the number of sensitive elements having substantially the same level is smaller than a predetermined value, the position of the superimpose is corrected to P3,..., Pn until it becomes larger than the predetermined value. Eventually, optimum combined image data Ir1 of the two image data I0 and I1 is obtained as shown in FIG. The optimum composite image data Ir1 is stored in the image storage unit 3.
[0023]
Next, when the image data I2 at time t2 is stored in the image storage unit 3, the image construction unit 4 makes the image data I2 the optimum overlap position with the image data Ir1 as shown in FIG. To generate composite image data Ir2. The above processing is repeated until the image data Irn of the entire identification target 13 is constructed as shown in FIG. Therefore, the partial (slice-like) image data read by the unevenness detection unit 2 is synthesized by the image construction unit 4, and image data of the entire identification target 13 is obtained. FIG. 2 shows an example of the image data actually constructed with the amount display portion of the 2000 yen bill as the identification target 13.
[0024]
Note that the image construction algorithm is not limited to the above example as long as an image of the entire identification target 13 can be obtained from the partial image data read by the unevenness detection unit 2. For example, when the relative speed between the unevenness detection unit 2 and the paper sheet 12 is constant, a position where two consecutive image data overlap from the relative speed is predicted in advance, and the two image data are superimposed. The position of the first attempt may be set to the predicted position. Thereby, unnecessary calculation can be avoided and the processing speed of the image construction unit 4 can be increased.
[0025]
In the feature extraction unit 5 of the present embodiment, the features of the uneven pattern of the identification target 13 are expressed as numerical values based on the image data constructed as described above. By digitizing the concavo-convex pattern, the comparison process in the pattern comparison unit 6 can be performed easily and quickly. A method for digitizing the features of the concavo-convex pattern is not particularly limited. For example, there is projection. For example, all the pixel data on the Y axis at each position of the X axis shown in FIG. 2 are added (pixel data takes a value from 0 to 255 if it is 8-bit data, for example). Then, the curve shown in FIG. 3 is obtained. This process is generally called projection. The feature extraction unit 5 is realized, for example, by storing a program for executing the projection in a ROM included in the CPU 15 in advance and executing the program by the CPU 15.
[0026]
The pattern comparison unit 6 of this embodiment compares the projection of the concavo-convex pattern obtained by the feature extraction unit 5 with the reference pattern obtained in advance. The reference pattern is, for example, a projection obtained in advance for the identification target 13 of a genuine note to be compared, and is stored in advance in a ROM provided in the CPU 15. In addition, when there are a plurality of types of correct bills to be compared, a plurality of types of reference patterns corresponding to each correct ticket are prepared. The pattern comparison unit 6 is realized, for example, by comparison calculation processing by the CPU 15. Here, as a measure of similarity in comparison, for example, a normalized correlation coefficient between the uneven pattern data of the paper sheet 12 to be measured and the uneven pattern data of the genuine note may be used. In this embodiment, the uneven pattern data refers to projection. Since the projection is represented by a one-dimensional array, the projection one-dimensional array of the paper sheet 12 to be measured is represented by A (a 1 , A 2 , ..., a n ) And a one-dimensional array of reference patterns B (b 1 , B 2 , ..., b n ), The normalized correlation coefficient r is obtained by Equation 1. A 0 , B 0 Represents the arithmetic mean of the elements of the one-dimensional arrays A and B, respectively.
[Expression 1]
[0027]
When the projection of the concavo-convex pattern of the paper sheet 12 to be measured is coincident with any one of the reference patterns or within a certain allowable range as a result of the comparison calculation in the pattern comparison unit 6, It is determined that the paper sheet 12 to be measured is a genuine note corresponding to the reference pattern, and in other cases, it is determined that the paper sheet 12 to be measured is a fake ticket. A message to that effect or the like is displayed on a display means (display or the like) not shown, or a warning sound is output from a speaker or the like not shown. The determination unit 7 is realized, for example, by storing a program for executing the above process in a ROM provided in the CPU 15 in advance and executing the program by the CPU 15.
[0028]
Here, in the identification device 1, a heating unit 8 for heating the unevenness detection unit 2, a temperature detection unit 9 for detecting the temperature of the unevenness detection unit 2, and a temperature detection unit 9 are set in advance. It is preferable to further include a temperature adjusting unit 10 that adjusts the heating unit 8 so as to reach the target temperature.
[0029]
The target temperature is set in consideration of, for example, the temperature of the paper sheet 12 and the unevenness detection unit 2 when the reference pattern is measured, the temperature at which the unevenness detection unit 2 functions normally, and the value is the CPU 15. Is stored in advance in a ROM. The heating unit 8 may be a known or new heat generator that generates thermal energy by passing an electric current, for example. As the temperature detection unit 9, for example, a known or new temperature sensor that converts a temperature change into an electric signal can be used. For example, the temperature adjustment unit 10 performs feedback control so as to achieve a set target temperature by turning on / off the power supply to the heating unit 8 in consideration of an electric signal sent from the temperature detection unit 9 by the CPU 15. It is realized with.
[0030]
By setting the unevenness detection unit 2 and the paper sheet 12 to be measured to the target temperature, the unevenness detection unit 2 can be operated under optimum conditions, and the paper is used under the same temperature conditions as when the reference pattern was measured. Leaves 12 can be identified. Thereby, the accuracy of the identification device 1 can be further increased.
[0031]
According to the identification device 1 of the paper sheet 12 of the present invention configured as described above, the concave / convex pattern of the identification target 13 by the printing ink or the like is detected as a two-dimensional image, and further, the identification target 13 in the identification target 13 is detected by image processing technology. The feature of the uneven pattern can be extracted with high accuracy, and as a result, it can contribute to the authenticity determination of the paper sheet 12 or the improvement of the reliability of the ticket type specification.
[0032]
Here, the color copier or color printer cannot faithfully imitate the information on the unevenness of the printing ink on the surface of the paper sheet 12. Therefore, if the paper sheet 12 to be measured is a counterfeit ticket duplicated by a color copier or a color printer, the projection calculated from the uneven image of the counterfeit ticket is a projection obtained from the correct ticket (for example, FIG. It is clearly different from 3) and theoretically becomes a straight line (Y = constant). According to the identification apparatus 1 for the paper sheet 12 of the present invention, this difference can be reliably detected, and the counterfeit paper sheet 12 copied by a color copier or a color printer can be reliably excluded.
[0033]
Further, according to the present invention, since an optical system is not required, the apparatus mechanism can be simplified, and complicated adjustment is not necessary. Therefore, the identification device 1 can be reduced in size and simplified, and the cost can be reduced.
[0034]
Next, a second embodiment of the paper sheet identification apparatus of the present invention is shown in FIG. The paper sheet identification device 16 includes the unevenness detection unit 2 described in the first embodiment, the image storage unit 3 described in the first embodiment, and the same in the first embodiment. A data processing unit 17 including an image construction unit 4, a feature extraction unit 5, a pattern comparison unit 6, and a determination unit 7, and a display unit 18 for displaying the result of the determination unit 7, and is housed in a portable case body 19. It will be. Although not particularly illustrated, the heating unit 8, the temperature detection unit 9, and the temperature adjustment unit 10 may be further provided.
[0035]
The case body 19 is formed in a size that can be carried by the user. As described above, the unevenness detection unit 2 can be configured smaller than the identification target 13 on the surface of the paper sheet 12, and the image storage unit 3 and the data processing unit 17 can be integrated. It can be stored in a case body 19 having a portable size. In addition, the display unit 18 may be a simple one that simply displays whether the measurement target paper sheet 12 is a genuine ticket or a counterfeit using, for example, a small liquid crystal display.
[0036]
The identification device 16 for the paper sheet 12 operates as follows, for example. First, the user brings the unevenness detection unit 2 into contact with the surface of the paper sheet 12 to be measured, and slides it in the horizontal direction (reading direction) while keeping the contact. At this time, the concavo-convex detection unit 2 detects the concavo-convex state on the surface of the paper sheet 12, and sequentially outputs sliced image data corresponding to the level of the concavo-convex. The sequentially output image data is stored in the image storage unit 3, and the image data of the entire identification target 13 is constructed by the image construction unit 4. Then, the uneven pattern of the identification target 13 is extracted by the feature extraction unit 5 based on the constructed image data, and the extracted uneven pattern and the reference pattern obtained in advance are compared by the pattern comparison unit 6. Based on the result of the pattern comparison unit 6, the authenticity of the paper sheet 12 is determined by the determination unit 7, and finally the determination result is displayed on the display unit 18. In the case of the second embodiment, the identification device 16 can be configured inexpensively and in a small size. Since the identification device 16 is portable, the user of the identification device 16 can easily check the authenticity of the paper sheet 12 or the type of the paper sheet without taking a place.
[0037]
Next, FIG. 5 shows a third embodiment of the paper sheet identification apparatus of the present invention. The paper sheet identification device 35 includes the unevenness detection unit 2 described in the first embodiment, the image storage unit 3 described in the first embodiment, and the image construction described in the first embodiment. A data processing unit 17 including a unit 4, a feature extraction unit 5, a pattern comparison unit 6, and a determination unit 7, a feeding mechanism 36 for the paper sheet 12, a conveyance path 37 through which the paper sheet 12 is conveyed, and a determination unit 7. Based on this determination, a mechanism 38 for branching the paper sheets 12 and a mechanism 39 for accumulating the sorted paper sheets 12 are provided. Although not particularly illustrated, the heating unit 8, the temperature detection unit 9, and the temperature adjustment unit 10 may be further provided.
[0038]
The identification device 1 for the paper sheet 12 operates as follows, for example. The paper sheet 12 fed out from the feeding mechanism 36 is conveyed on the conveyance path 37 by, for example, a belt, and passes through the unevenness detection unit 2. At this time, the concavo-convex detection unit 2 detects the concavo-convex state on the surface of the paper sheet 12, and sequentially outputs sliced image data corresponding to the level of the concavo-convex. The sequentially output image data is stored in the image storage unit 3, and the image data of the entire identification target 13 is constructed by the image construction unit 4. Then, the uneven pattern of the identification target 13 is extracted by the feature extraction unit 5 based on the constructed image data, and the extracted uneven pattern and the reference pattern obtained in advance are compared by the pattern comparison unit 6. Based on the result of the pattern comparison unit 6, the type of the paper sheet 12 is determined by the determination unit 7. The branching of the paper sheet 12 is controlled by the paper sheet branching mechanism 38 according to the determination result of the determination unit 7. In the case of the third embodiment, the identification device 1 that can reliably sort the paper sheets 12 can be configured at low cost.
[0039]
The above-described embodiment is an example of a preferred embodiment of the present invention, but is not limited thereto, and various modifications can be made without departing from the scope of the present invention. For example, the present invention is applicable to all paper sheets that are uneven but have unevenness due to printing or the like on the entire surface or a part of the surface. For example, it can be widely applied to identification devices for cash vouchers such as checks and traveler's checks, identification devices for identification cards such as licenses and passports, and authenticity determination devices for official documents and important documents.
[0040]
【The invention's effect】
As is apparent from the above description, the paper sheet identification apparatus according to claim 1 is based on printing ink or the like on the paper sheet surface that cannot be faithfully imitated by an optical device, a color copier, or a color printer. Since the concave / convex pattern is detected and the authenticity or type of the paper sheet is determined based on the uneven pattern, the counterfeit paper sheet duplicated by the color copier or the color printer can be surely excluded. In addition, since the present invention does not require an optical system, the device mechanism can be simplified and no complicated adjustment is required. Furthermore, since the image construction unit is provided in the present invention, the unevenness detection unit can classify and detect the identification target, and an unevenness detection unit smaller than the identification target can be employed. Therefore, the identification device can be reduced in size and simplified, and the cost can be reduced.
[0041]
Furthermore, according to the paper sheet identification device of claim 2, based on the results of the heating unit for heating the unevenness detecting unit, the temperature detecting unit for detecting the temperature of the unevenness detecting unit, and the temperature detecting unit in advance. Since it further includes a temperature adjustment unit that adjusts the heating unit so that the set target temperature is reached, the unevenness detection unit can be operated under optimum conditions, and is the same as when the reference pattern is measured Paper sheets can also be identified by temperature conditions. Thereby, the accuracy of the identification device can be further increased.
[0042]
In addition, according to the paper sheet identification device according to claim 3, since the display unit displaying the result of the determination unit is provided and stored in the portable case body, the paper can be easily stored without taking up space. The authenticity of the leaf or the type of the paper can be checked.
[Brief description of the drawings]
FIG. 1 is a schematic block diagram showing an embodiment of a paper sheet identification apparatus of the present invention.
FIG. 2 is an image diagram showing an example of image data of the entire identification target constructed by the paper sheet identification apparatus of the present invention.
3 is a graph showing the projection of FIG. 2 (a sum of all data on the Y axis at each position on the X axis). FIG.
FIG. 4 is a schematic configuration diagram showing another embodiment of the paper sheet identifying apparatus of the present invention.
FIG. 5 is a schematic configuration diagram showing still another embodiment of the paper sheet identifying apparatus of the present invention.
FIG. 6 is a schematic cross-sectional view showing an example of an unevenness detection unit used in the paper sheet identification device of the present invention.
FIG. 7 is a schematic diagram for explaining a size of an unevenness detection unit with respect to an identification target.
FIG. 8 is a schematic diagram for explaining a relative position between an unevenness detecting unit and an identification target at the time of measurement.
FIG. 9 is a schematic diagram for explaining a process of estimating an overlapping portion of continuous image data, and shows an initial state.
FIG. 10 is a schematic diagram for explaining a process of estimating an overlapping portion of continuous image data, and shows an intermediate state.
FIG. 11 is a schematic diagram for explaining a process of estimating an overlapping portion of continuous image data, and shows a final state.
FIG. 12 is a schematic diagram showing a process of constructing image data of the entire identification target by combining partial image data.
FIG. 13 is a schematic diagram showing image data of the entire identification target constructed by combining partial image data.
[Explanation of symbols]
1 Paper identification device
2 Concavity and convexity detector
3 Image storage
4 Image construction department
5 Feature extraction unit
6 Pattern comparison part
7 Judgment part
8 Heating part
9 Temperature detector
10 Temperature control unit
18 Display section
19 Case body

Claims (3)

  1. The identification caused by the height / depth of the unevenness of the identification target, which is composed of an array of thermal elements that cause a charge change corresponding to the unevenness of the identification target so as to be smaller than the identification target on the surface of the paper sheet An unevenness detecting unit that detects a temperature distribution of an air layer between a target and the thermal element by a change in charge of the thermal element , converts the temperature distribution into an electrical signal, and outputs partial image data of the identification target; and the partial An image storage unit for storing image data, an image construction unit for constructing image data of the entire identification target by combining partial image data stored in the image storage unit, and the constructed image data A feature extraction unit for extracting the concavo-convex pattern to be identified, a pattern comparison unit for comparing the extracted concavo-convex pattern with a reference pattern obtained in advance, and a paper sheet based on the result of the pattern comparison unit Identification device of the paper sheet, characterized in that it comprises a determining unit a type of authenticity or sheet of.
  2.   The heating unit for heating the unevenness detecting unit, the temperature detecting unit for detecting the temperature of the unevenness detecting unit, and adjusting the heating unit so as to have a preset target temperature based on the result of the temperature detecting unit The paper sheet identification device according to claim 1, further comprising a temperature adjusting unit that performs the operation.
  3.   The paper sheet identification device according to claim 1, further comprising a display unit that displays a result of the determination unit, and housed in a portable case body.
JP2001335680A 2001-10-31 2001-10-31 Paper sheet identification device Expired - Fee Related JP3921073B2 (en)

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JP2001335680A JP3921073B2 (en) 2001-10-31 2001-10-31 Paper sheet identification device

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JP2001335680A JP3921073B2 (en) 2001-10-31 2001-10-31 Paper sheet identification device

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JP3921073B2 true JP3921073B2 (en) 2007-05-30

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US8171567B1 (en) 2002-09-04 2012-05-01 Tracer Detection Technology Corp. Authentication method and system
RU2385492C2 (en) 2004-03-12 2010-03-27 Инджениа Текнолоджи Лимитед Methods, articles and devices for verification of authenticity
BRPI0508635A (en) 2004-03-12 2007-08-07 Ingenia Technology Ltd printing device, and apparatus and methods for creating authenticable articles and for verifying the authenticity of articles
JP4834968B2 (en) * 2004-08-11 2011-12-14 富士ゼロックス株式会社 Authenticity determination system, authenticity determination device and program
GB2417074B (en) * 2004-08-13 2007-11-21 Ingenia Technology Ltd Authenticity verification methods,products and apparatuses
JP2006171953A (en) * 2004-12-14 2006-06-29 Laurel Seiki Kk Paper sheet detection device
EP1908027B1 (en) 2005-07-27 2010-09-29 Ingenia Holdings Limited Verification of authenticity
US20080112460A1 (en) * 2006-11-14 2008-05-15 Ncr Corporation Detecting intaglio print
WO2008062287A1 (en) * 2006-11-23 2008-05-29 Sicpa Holding S.A. Use of fingerprint recognition equipment for the authentication of sheet-like items
JP4913184B2 (en) * 2009-08-06 2012-04-11 東芝ソリューション株式会社 Identity verification document authenticity determination device, identity verification document authentication method and program
GB2476226B (en) 2009-11-10 2012-03-28 Ingenia Holdings Ltd Optimisation
JP6543779B2 (en) * 2014-08-05 2019-07-10 覚 上山 Sticking ring

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103390308A (en) * 2013-07-05 2013-11-13 陈卫文 High speed note distinguishing system and method based on partial image sub blocks
CN103390308B (en) * 2013-07-05 2016-12-28 深圳市国科微半导体股份有限公司 High speed currency judgement system based on parts of images sub-block and method of discrimination thereof

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