EP0101115A1 - A device for recognising and examining bank-notes or the like - Google Patents

A device for recognising and examining bank-notes or the like Download PDF

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Publication number
EP0101115A1
EP0101115A1 EP83201073A EP83201073A EP0101115A1 EP 0101115 A1 EP0101115 A1 EP 0101115A1 EP 83201073 A EP83201073 A EP 83201073A EP 83201073 A EP83201073 A EP 83201073A EP 0101115 A1 EP0101115 A1 EP 0101115A1
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EP
European Patent Office
Prior art keywords
bank
note
light
notes
colour
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP83201073A
Other languages
German (de)
English (en)
French (fr)
Inventor
William Howard Havens
Jan Willem Klumper, Jr.
Alexander Leopold Ehrhard Koppenaal, Jr.
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nederlandse Organisatie voor Toegepast Natuurwetenschappelijk Onderzoek TNO
Original Assignee
Nederlandse Organisatie voor Toegepast Natuurwetenschappelijk Onderzoek TNO
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nederlandse Organisatie voor Toegepast Natuurwetenschappelijk Onderzoek TNO filed Critical Nederlandse Organisatie voor Toegepast Natuurwetenschappelijk Onderzoek TNO
Publication of EP0101115A1 publication Critical patent/EP0101115A1/en
Withdrawn legal-status Critical Current

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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
    • G07D7/06—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
    • G07D7/20—Testing patterns thereon
    • G07D7/202—Testing patterns thereon using pattern matching
    • G07D7/205—Matching spectral properties

Definitions

  • a device of this kind comprising guiding means with driving means for transporting a bank- note to be examined, a light source producing a light beam across the transport path of the bank-note, a row of light-sensitive cells at the other side of said path, the length of said row being at least equal to the largest occurring width of bank-notes, means for processing the output signals of said light-sensitive cells and comparing said signals with reference values stored in a memory,:and means for determining at least one dimension of the bank-note and of its colour.
  • This known device is provided with means for measuring the length and width of the bank-notes, which measurement can be used to select specific areas to be examined on the presence of deficient spots, e.g. invalidation marks, and these areas are characterised by co-ordinates in two directions, additional means being provided for suppressing unwanted areas having mirror symmetry in respect of the selected ones.
  • This known device does not make use of a particular general advantage of the measurement of the transmitted light, namely that the patternsat both sides of a bank-note which are different and do not register can be examined in one scanning operation, and the specific relationship between both patterns provides a dependable criterion for testing whether a bank-note is genuine or forged. Moreover this known device is not suitable for examining the validity of soiled and worn as well as brand-new bank-notes, and its operation depends on the existence of specific areas which can be considered as being representative for the validity of the bank-note.
  • the bank-notes are to be introduced in an orientation which corresponds to the co-ordinates of said areas as stored in the device.
  • a device which is adapted to examine particular areas of a bank-note provided with a specific print indicating its value, in which one photo-electric sensor is used for scanning the line in question using reflected light.
  • Such a device can only be used for bank-notes of a specific country having printed patterns which are suitable for being analysed in this manner, and, moreover, requires the bank-notes to be introduced in a given orientation.
  • the invention provides a device of this kind which is universally applicable,and does not require to insert a bank-note to be examined in a specific orientation.
  • the device provides, furthermore, an extremely dependable examination of bank-notes or the like, and nevertheless allows for the wide variation in quality between new and used bank-notes.
  • the device is characterised in that the processing means comprise a matrix buffer memory having as many lines as there are light-sensitive cells, the number of columns corresponding to the number of times that the transverse dimension of said cells is comprised in the length of the largest area of a bank-note to be examined, each memory cell being adapted to contain a plurality of digital values corresponding to the different light intensities measured by the light-sensitive cells, this in such a manner that this buffer memory will form a digital picture of the transmission pattern of the bank-note, said memory contents, irrespective of the orientation of the bank-note, then being compared in a comparator with the corresponding contents of partial memories each comprising a standard pattern for a specific bank-note value, said comparator being connected to a circuit adapted to perform a statistical correlation operation, said circuit being, moreover, connected to comparator circuits for measuring the colour and/or ultraviolet reflection over a larger area, said correlation circuit being adapted to emit an acceptance signal at a sufficient correspondence of both patterns.
  • the processing means comprise a matrix buffer memory having as many lines
  • a digital picture of the bank-note to be examined is present in the device which can be repeatedly read out, thus allowing a great number of comparisons to be made successively, and, moreover, each memory cell of this buffer memory can contain the digital equivalent of a large number of light intensities, thus providing a fine discrimination for variations in the printed pattern. Since a complete picture is made, the device is independent of the kind of bank-notes, the variable elements being the reference memories which are to be adapted to the kind of bank-notes to be examined, and the latter can be provided in any number in the device.
  • each partial memory will preferably consist of at least four submemories corresponding to different bank-note orientations. If the value of the bank-note can be determined from other characteristics such as dimensions and/or colour, the specific partial memories to be used can be selected on the basis of such characteristics.
  • the reading sequence control of the buffer memory can be adapted to perform successive reading operations successively shifted by one or more lines and/or columns so as to allow for variations in the position of the pattern on bank-notes and/or in the orientation of the bank-notes in respect of the light-sensitive cells.
  • the partial memories preferably contain standard information relating to measuring points which are distributed substantially arbitrarily over at least a part of a bank-note, the comparison taking place solely in these points. These points will, in particular, be chosen so that an optimal examination will be obtained with a minimum number of measuring points. Said points can be different for different bank-notes. The arbitrary and variable distribution of these points will prevent that counterfeiters will concentrate on such examined regions as may be the case in the known devices mentioned above.
  • the correlation operation comprises, in particular, a correlation operation of the ratios of individual measurement values, this in such a manner that a consistent relative deviation over the whole area of measurement can be considered as being acceptable, thus allowing for wear and soiling of old bank-notes.
  • Comparison operation in the comparator can, in particular, relate to a portion, and in particular one half, of the bank-note, and can be repeated, a.g. with different standards,for another portion if the first-mentioned operation is not sufficiently decisive, so that partially damaged bank-notes can be nevertheless accepted.
  • Comparison operation will, in particular, be performed only if the dimensions, the colour, the ultraviolet reflection or ⁇ the like of a bank-note comply with the standards which will save time in the case of obviously'unacceptable bank-notes.
  • the colour measuring means are in particular adapted to perform an integration over a substantial part of the width of a bank-note to be examined, it being understood that a detailed examination of the colour is not required.
  • the colour measuring means can be adapted to calibrate the light intensity measurement on the basis of an intensity measurement of the light source before the arrival of the bank-note. In this manner aging phenomena of the light source can be compensated.
  • the device according to the invention diagrammatically shown in Fig. 1 comprises a guiding plate 1 for supporting a bank- note to be examined. At the left-hand side this plate joins an introduction slot, not shown, of an automatic device from which the present device forms a part, and between said slot and the plate 1 mechanical orientation means, not shown, are provided which ensure that an introduced bank-note is supplied straight against a guiding ridge 2 of the plate 1.
  • driving wheels 3 are included which are connected to shafts 4, the latter being coupled with a motor, not shown, via strings, toothed belts, chains or the like. If necessary one or more driven pressing belts or the like can be provided above the plate, in order to allow to grip a supplied bank-note unambiguously.
  • a sensor 5 in particular an electronic-optic sensor, is arranged which is adapted to switch on the driving motor and/or to perform other switching operations at the arrival of a bank-note on the plate 1.
  • a lamp 6 is arranged above the plate 1 which is metallised or is mounted before a mirror 7, and, if necessary, a heat filter can be provided. If required a condensor lens 8 can be mounted below the lamp 6.
  • a slot 9 is provided in the plate 1 passing the light emitted by the lamp 6.
  • a series of light-sensitive cells 10, such as photo-diodes, is arranged which are placed as closely to one another as possible, each cell being enclosed in a tubular enclosure 11 operating as a collimator for defining an associated measuring surface.
  • a second slot 12 is provided which is narrower than the first one in order to exclude marginal areas of the bank-note which may be damaged.
  • an optical system 13 diagrammatically shown, is arranged which directs the passed beam towards three sensitive cells 14, two of which being provided with associated colour filters 15 having mutually different spectral transmission ranges.
  • the colour of the bank-note portions situated above the slot 12 can be determined, and the cell not provided with a filter provides a reference value for determining the intensity in the partial ranges transmitted by the filters 15.
  • a part of the light emitted by the lamp 6 comprising ultraviolet radiation is directed, by means of an optical system 16, towards an area 17 of the plate 1.
  • the remitted radiation is collected by a sensitive cell 18 with an ultraviolet absorbing filter 19.
  • the drive of the wheels 3 and possibly associated pressing belts is switched on. If the lamp 6 does not burn, it is switched on or an economising circuit is switched off. Furthermore processing circuits to be described below are activated.
  • the bank- note passes below the lamp 6 so that the emitted light passes through the bank-note, and is, corresponding to the printed pattern, absorbed or transmitted, and, in correspondence with the translation velocity, a slot-wise scanning over the width of the bank-note in transmission takes place.
  • the intensity of the transmitted light influences the output signal of the different cells 10.
  • the light passing through the second slot 12 arrives at the cells 14, and the cell without a filter 15 can determine the total transmitted light intensity within a broad spectral range, and the two other cells divide the spectrum in partial ranges.
  • the lamp 6 is a lamp having a radiation spectrum extending into the near ultraviolet, and is, for instance, a halogen lamp.
  • the optical system 16 directs ultraviolet radiation towards the moving bank-note, which radiation can give rise to fluorescence of components present in the paper.
  • the intensity of the fluorescence radiation is, then, determined by the cell 18. It has appeared that particular high-quality paper species, which are, inter alia, used for bank-notes, do not or only weakly fluoresce, so that in this manner falsifications on other paper can be detected.
  • auxiliary means not shown, for directing accepted bank-notes towards a protected collecting vessel, and refused bank-notes are returned, as usual, towards a return slot or the like.
  • the print at both sides of the bank-note will influence the transmitted light intensity. Since the print, at least in a substantial part, can consist of complex patterns, and the patterns at both sides, will, generally, not register for a substantial part, a useful examination on acceptability can be obtained when using a sufficient large number of cells 10.
  • the measurement signals of the cells should be statistically processed in such a manner that a safe discrimination threshold can be applied, i.e. that from a given number of local oorrespon- dences with a standard which has been fixed on the basis of real bank-notes acceptance will follow.
  • This bank-note has, at both sides, a substantially unprinted wide margin 21, where value indicating prints 22, at one side a tactile mark for blind people, and at the other side a series number are present, and in the paper a watermark 25 is provided.
  • the lateral margins 26 are unprinted, at one side completely, and at the other side for the greater part, and the other terminal margin 27 which is relatively narrow is unprinted too.
  • the intermediate area 28 is provided with a complex line grid pattern which is different at both sides. The,colour is characteristic for the value. All Netherlands bank-notes have the same width but their length increases with the value.
  • the paper comprises substantially no components which give rise to a substantial ultraviolet fluorescence.
  • the cells 10 will produce a more or less strong signal depending on the local transmittivity, and the cells 14 will produce a signal representing the average transmittivity, in particular in the spectral ranges determined by the filters 15, for a part of the width of the bank-note.
  • the signals of the cells 10 are supplied, by means of a discriminator 29 which is adapted to divide the signal intensities in a plurality of groups and to emit digital signals accordingly, to a buffer or intermediary memory 30 having cells 31 which are, for example, divided into rows and columns. Vriting the signals into successive columns is done under control of a sensor 32 connected to the driving means of the wheels 4 so that this will take place in correspondence with the transport velocity of the bank-note.
  • the contents of the cells 31 form a picture of the bank-note in the form of a grid, the printing patterns at both surfaces of the bank-note overlapping each other of course.
  • the contents of the memory cells 31 are, then, a measure for the transmittivity determined by the measuring cells 10.
  • the memory cells can, in particular, each have a capacity of 2 8 so that a fine division in the measurement values can be obtained.
  • the distribution of these measurement values over the cells 31 depends on the orientation of the bank-note when inserted, there being several possibilities such as above/below and left/ right. From a provisional scan of the memory cells corresponding to the marginal areas 25 and 27 of the bank-note the position of these areas can be determined, and from the position of, for instance, the value print 22 and, for instance, the tactile marks 23 it can be ascertained which side is directed upwards.
  • the buffer memory 30 can be scanned by means of row and column connections 33 and 34 resp. By making the scanning succession in the rows and columns dependent on the orientation of the bank-note as determined, a specific memory cell will be in its turn always in the same point of the scanning sequence irrespective of the orientation of the bank-note on the plate 1.
  • the reference values used for comparison are stored in digital form in a plurality of memories 36a..d, each corresponding to a given bank-note value, the number thereof depending on the number of values to be recognised, e.g. f 5,--, f 10,--, f 25,--and f 100,--.
  • the data read in series from the buffer memory 30 are being compared in a comparator 37, e.g. according to a correlation procedure, with the corresponding values which are read out cell- by-cell from the appropriate memory 36.
  • the value of the bank-note is to be determined first. In the case of Netherlands bank-notes this can, for instance, be done by measuring the length of the bank-note. This can follow from the contents of the columns in the matrix of cells 31. To that end the last column terminals 34' in Fig. 3 are connected to a counter 38 which can send a set signal to the comparator 37 so as to activate the connections with the associated memory 36 accordingly. It is also possible to measure the length of the bank-note by means of the sensor 5 and a time measuring circuit 39, as has been diagrammatically indicated ae well, the timing being provided therein by the sensor 32, and also a direct coupling between the cells 10 or the circuit 29 and the counting circuit 39 can be used.
  • the value determination can also be done by means of the colour measurement.
  • the cells 14 are coupled with a circuit 40 which is adapted to determine the intensity ratios and to derive therefrom colour information.
  • the latter circuit can be connected to an auxiliary circuit 40 which, if necessary after integration over the whole area, can perform a comparison with standard values stored in a memory 42.
  • the circuit 41 can have the form of a buffer memory which is adapted to memorise the information relating to a number of strips of the bank-note, and to compare this information with corresponding information from the memories 42.
  • the colour measurement or, if desired, only that of the bank-note portions examined first, can be used as a value characteristic which is sent to the circuit 37 via a connection 43 in order to bring about the value adjustment. It is also possible to use both value characteristics, viz. length and colour, together, and then a choice among the memories 36 will only be made"af a sufficient correlation between both.
  • Calibrating the device can be done, for instance, just before the bank-note has reached the slot 9, and the light intensity measured (without a bank-note) can be used as a standard value by reference to which the measurement results can be updated, for instance when the light intensity of the lamp 6 decreases.
  • the suitable value can be derived therefrom at the correct moment.
  • the circuit 37 sends the comparison results towards a processing and decision circuit 44 in which these results are processed. Also the comparator circuit 41 for the colour measurements is connected to the circuit 44 in order to allow to include also the results of the colour measurement into the judgement.
  • the measuring cell 18 is connected to a processing circuit, which can, again, be in the form of a buffer memory, the latter circuit also being connected to the circuit 44.
  • the memories 36 and 41 can be adjusted as follows. Of the various considered bank-notes the different measurement values are determined and transformed into numerical values. Moreover, and in particular in respect of the colour value, the existing deviations between new and still acceptable used bank-notes can be determined. These data are stored in a suitable memory from which the memories of the devices can be filled. Thus adapted memories for different countries can be made which can be inserted as needed into devices to be delivered.
  • the correlation between the values measured in different points and the corresponding stored values is determined over the whole area, and, as required, the width of the allowed variation range can be fixed. This width should be such that local damages, folds, inscriptions, stains etc., if within reasonable limits, will not lead to rejection, but bank--notes missing considerable parts are to be rejected. If desired different weight fractors can be used in the processing of different areas so as to give areas with important pattern elements a greater influence on the examination results.
  • the examination programme can, for instance, be structured as follows. When, after having passed the sensor, the bank-note reaches the light beam within a given time, and, for instance, the fluorescence remains within the accepted limits, a dimension measurement takes place, and subsequently a colour measurement over the whole surface. If these measurements have been successful, the watermark and, subsequently, the pattern can be examined. If one of the preceding criteria should already lead to rejection, the subsequent measurements can be omitted, and the bank-note is immediately returned towards the return slot. Of course the order of importance can be changed.
  • circuits of the block diagram of Fig. 3 can be realised in many ways, and, in particular, can be composed of partial circuits with specific tasks and/or operations, and additional cross-links between these circuits can be provided if a mutual dependency or feed-back is desired.
  • bank-notes having a different pattern structure are to be examined, corresponding data are to be introduced, but the structure of the device does not need to be modified. If, for instance, bank-notes of different values have the same dimensions and colour, such as US dollar bills, the value is completely to be derived from the pattern examination. If, however, these bank-notes are provided with a magnetic marking, an adapted sensor can be added to the device in the usual way. If the bank-notes, as in the case of (German) DM bank-notes of different values, differ not only in length but also in width, a measurement of the length/width ratio can be used if desired.
  • each partial memory 36 can be divided into four submemories each corresponding to a specific orientation of the bank-note, said submemories participating simultaneously in the comparison, and only the comparison values falling inside the preset variation range will be used. At the beginning of the comparison it will already appear which submemories are not to be used, which can be switched off then. The same can also be done in the case of different value patterns, and then all the partial memories 36 will be activated until the value has been ascertained.
  • connection 47 should connect the circuit 45 with a control input of comparator 37, and the connection 43 can be used for that purpose as far as the colour measurement is concerned.
  • the comparison will generally be done in only one half of the bank-note. However, if the results are dubious or negative, the comparison will be repeated in the other half, if desired with a different correlation threshold, and final rejection will follow if the second comparison results are insufficient too. However, if the device is used for checking the quality of used bank-notes, e.g. by the issuing central bank, it may be desirable to extend the examination over the whole surface, and using a larger number of reference points may be advisable then.
  • the correlation operation can also be performed on the ratio between the individual measurement and reference values, which is a better criterion in the case of soiled bank-notes. If, as a whole, a consistent ratio correlation is obtained, the bank-note can be safely accepted.
  • Such a device can also be used for recognising sheet material other than bank-notes, e.g. cheques and the like.
  • light guides can be advantageously used, which allow to direct the light accurately towards the desired point, e.g. for avoiding light losses and/or interactions between neighbouring measuring points, or for enabling to arrange the measuring cells in a more favourable point.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • Inspection Of Paper Currency And Valuable Securities (AREA)
  • Length Measuring Devices By Optical Means (AREA)
EP83201073A 1982-07-20 1983-07-20 A device for recognising and examining bank-notes or the like Withdrawn EP0101115A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL8202920 1982-07-20
NL8202920A NL8202920A (nl) 1982-07-20 1982-07-20 Inrichting voor het herkennen en onderzoeken van bladvormige voorwerpen zoals bankbiljetten of dergelijke.

Publications (1)

Publication Number Publication Date
EP0101115A1 true EP0101115A1 (en) 1984-02-22

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ID=19840056

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83201073A Withdrawn EP0101115A1 (en) 1982-07-20 1983-07-20 A device for recognising and examining bank-notes or the like

Country Status (3)

Country Link
EP (1) EP0101115A1 (ja)
JP (1) JPS5938889A (ja)
NL (1) NL8202920A (ja)

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