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EP3210195B1 - Dispositif et procédé de vérification de documents de valeur, en particulier des billets de banque, et système de traitement de documents de valeur - Google Patents

Dispositif et procédé de vérification de documents de valeur, en particulier des billets de banque, et système de traitement de documents de valeur Download PDF

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Publication number
EP3210195B1
EP3210195B1 EP15791248.6A EP15791248A EP3210195B1 EP 3210195 B1 EP3210195 B1 EP 3210195B1 EP 15791248 A EP15791248 A EP 15791248A EP 3210195 B1 EP3210195 B1 EP 3210195B1
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EP
European Patent Office
Prior art keywords
electromagnetic radiation
spectral
radiation
sensor signals
sensor
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EP15791248.6A
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German (de)
English (en)
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EP3210195A1 (fr
Inventor
Jörg Frankenberger
Thomas Giering
Wolfgang Rauscher
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.)
Giesecke and Devrient Currency Technology GmbH
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Giesecke and Devrient Currency Technology GmbH
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    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
    • 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
    • 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
    • G07D7/1205—Testing spectral properties
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
    • G07D7/00—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency
    • G07D7/181—Testing mechanical properties or condition, e.g. wear or tear
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
    • G07D7/00—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency
    • G07D7/181—Testing mechanical properties or condition, e.g. wear or tear
    • G07D7/187—Detecting defacement or contamination, e.g. dirt
    • 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
    • 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

Definitions

  • the invention relates to a device and a method for checking valuable documents, in particular banknotes, as well as a valuable document processing system.
  • properties of banknotes such as printed image, denomination, authenticity and condition, are determined by recording the physical properties of the banknotes using sensors and evaluating the sensor data generated in the process.
  • one banknote is irradiated with the light of one or more light sources and the light remitted by the banknote, i.e. diffusely reflected or transmitted, is detected using one or more sensors.
  • the reflectance or transmission curves determined in this way can deviate from the actual reflectance or transmission behavior of the banknote.
  • LEDs light-emitting diodes
  • the device according to the invention for checking documents of value, in particular banknotes, according to claim 1 has: at least two radiation sources for emitting electromagnetic radiation, with which a document of value is irradiated; at least one sensor for detecting the electromagnetic radiation reflected and/or transmitted directed or diffusely by the document of value and generating corresponding sensor signals, with components assigned to the radiation sources, the sensor signals being corresponding reflection and/or transmission signals; an evaluation device which is designed to derive corrected sensor signals from the sensor signals generated by the at least one sensor, taking into account at least one spectral property of the electromagnetic radiation of the at least two radiation sources, wherein in deriving the corrected sensor signals at least one linear combination of components assigned to the different radiation sources the sensor signals are formed.
  • the method according to the invention for checking documents of value, in particular banknotes, according to claim 16 has the following steps: irradiation of a document of value with electromagnetic radiation from at least two radiation sources; Detecting the electromagnetic radiation reflected and/or transmitted in a directed or diffuse manner by the document of value and generating corresponding sensor signals, with components assigned to the radiation sources, the sensor signals being corresponding reflection and/or transmission signals; Derivation of corrected sensor signals from the sensor signals generated by the at least one sensor, taking into account at least one spectral property of the electromagnetic radiation of the at least two radiation sources, wherein in the derivation of the corrected sensor signals at least one linear combination is formed from components of the sensor signals assigned to the different radiation sources.
  • the valuable document processing system has at least one device for processing, in particular for transporting and/or counting and/or sorting, valuable documents, in particular banknotes, and is characterized by the device according to the invention for checking valuable documents.
  • the invention is based on the idea of subjecting the reflection or transmission signals generated by sensors when detecting the light reflected and/or transmitted by the document of value, which together preferably represent a spectral reflection and/or transmission signal curve, to a correction in which corrected Reflection or transmission signals, which together preferably represent a corrected spectral reflection or transmission signal curve, are obtained.
  • a correction in which corrected Reflection or transmission signals, which together preferably represent a corrected spectral reflection or transmission signal curve, are obtained.
  • at least one spectral property of the electromagnetic radiation emitted by the at least two radiation sources is used.
  • the spectral property of the electromagnetic radiation taken into account can refer to any property, in particular to the intensity, of the electromagnetic radiation emitted by the radiation source at one or more wavelengths or in one or more wavelength ranges.
  • the spectral property of the electromagnetic radiation taken into account relates to a value for the radiation intensity of a radiation source in the range of a first wavelength of a main emission and to a corresponding value in the range of a second wavelength of a further emission, which is also a secondary emission referred to as.
  • the spectral property of the electromagnetic radiation taken into account relates to a value for the radiation intensity in the range of a first wavelength of a main emission as well as to several corresponding values in ranges of further wavelengths of further emissions, which are also referred to as secondary emissions.
  • the spectral property can also relate to a wavelength-dependent intensity curve of the electromagnetic radiation emitted by the radiation sources in a broader wavelength range, in which in particular the main emission and the secondary emission or the secondary emissions are included.
  • the spectral property of the electromagnetic radiation can also be taken into account in the form of parameters that are derived from the above-mentioned properties, in particular the intensity values at certain wavelengths or in certain wavelength ranges, such as quotients, differences or sums the intensity values mentioned.
  • the spectral property of at least one light source can be taken into account when evaluating the sensor signals.
  • the at least one spectral property of the electromagnetic radiation from the at least two radiation sources is given by at least one spectral distribution of the electromagnetic radiation from the at least two radiation sources.
  • the spectral distributions of the n radiation sources differ from one another.
  • At least one spectral distribution of the electromagnetic radiation of the radiation sources is given by a first spectral distribution of the electromagnetic radiation emitted by the radiation sources and a second spectral distribution, which is different from the first spectral distribution.
  • a first spectral distribution of the electromagnetic radiation emitted by the radiation source corresponds to a spectral distribution with a main emission and at least one secondary emission.
  • a second spectral distribution preferably corresponds to the first spectral distribution, but without having at least one secondary emission.
  • the first spectral distribution is preferably determined by measuring, for example using a spectrometer, the radiation source or using associated data sheets.
  • the second spectral distribution can then be derived from the first spectral distribution by eliminating the spurious emission.
  • a particularly reliable and precise correction of the sensor signals can be achieved, particularly with regard to disruptive influences due to secondary emissions.
  • the corrected sensor signals are calculated by multiplying the generated sensor signals R with a correction matrix B.
  • the at least one spectral property of the electromagnetic radiation of the radiation sources is given by at least one parameter which has one or more spectral components, in particular the intensity, of the electromagnetic radiation of the radiation source, in particular at one or more wavelengths or Wavelength ranges, characterized.
  • the sensitivity of the respective sensor in particular at the wavelengths or wavelength ranges mentioned, can also be taken into account in the parameter.
  • the parameter corresponds then preferably a product of the intensity of the radiation emitted by a radiation source at a specific wavelength and the sensitivity of the respective sensor at this wavelength.
  • the at least one parameter can also be derived from two or more intensity values and possibly sensor sensitivity values at different wavelengths, for example by forming a quotient.
  • the relevant spectral properties of the radiation sources can be easily taken into account when correcting the sensor signals, so that relatively low computing capacities are sufficient even for spectral reflection or transmission curves in a wide spectral range, for example between 400 and 1100 nm to enable correction of the sensor signals in real time.
  • At least a first parameter a 1 characterizes the spectral portion of a main emission of the electromagnetic radiation of the radiation source and at least a second parameter a 2 characterizes the spectral portion of an emission occurring in addition to the main emission, a so-called secondary emission, of the electromagnetic radiation of the radiation source.
  • the evaluation device is designed in such a way that the corrected sensor signals are derived from the sensor signals, taking into account the first and second parameters a 1 or a 2 or a parameter a derived from the first and second parameters a 1 or a 2 , which in particular corresponds to the quotient a 1 / a 2 corresponds to the first and second parameters a 1 and a 2 , respectively.
  • the corrected sensor signals are normalized based on corrected reference signals, the corrected reference signals being generated from reference signals that are generated by the at least one sensor when detecting the electromagnetic radiation emitted by a reference document, a so-called white reference, are derived taking into account the at least one spectral property of the electromagnetic radiation of the at least two radiation sources.
  • the sensitivity of the at least one sensor for electromagnetic radiation in particular in the form of at least one spectral curve of the sensitivity, is preferably taken into account.
  • the corrected reference signals used in the normalization of the corrected sensor signals are preferably corrected analogously to the sensor signals.
  • Fig. 1 shows an example of a schematic structure of a value document processing system 1 with an input compartment 2, in which a stack of value documents to be processed, in particular banknotes 3, is provided, and a separator 8, from which the bottom banknote of the entered stack is recorded and sent to a - in
  • the selected representation is only shown schematically - transport device 10 is handed over, which transports the banknote in the transport direction T to a sensor device 20.
  • the sensor device 20 comprises light sources 24 and 25 - which are shown only in a very schematic form - for irradiating the banknote with light, in particular in the visible and/or infrared and/or ultraviolet spectral range, as well as a first, second and third sensor 21, 22 respectively.
  • 23, which is preferably designed as a so-called line camera and detects light emanating from the banknote, in particular in the visible and / or infrared and / or ultraviolet spectral range, by means of sensor elements arranged along a line and converts it into corresponding sensor signals.
  • LEDs Light-emitting diodes
  • LEDs are preferably used as light sources 24 and 25. Even if two light sources 24 and 25 are indicated in the example shown, it may be preferred to provide more than two light sources. Likewise, any other light sources such as fluorescent lamps, flash lamps, (filtered) incandescent lamps or the like can be used for the inventive method instead of LEDs.
  • the at least two light sources can also be implemented by a light source in conjunction with at least one switchable filter, provided that at least two individually addressable, different spectra are thereby made available.
  • this constellation is further described as two light sources or several light sources.
  • the sensor device 20 preferably has a plurality of light sources which emit light in different spectral ranges.
  • the respective spectral ranges of the light sources can be selected so that they together emit light in the spectral range in which the remission or transmission behavior of the banknote is to be tested.
  • This spectral range is preferably between approximately 350 and 1100 nm.
  • three LEDs can be combined, each of which emits light in the ultraviolet, visible and near infrared spectral range.
  • the first and second sensors 21 and 22 detect light remitted, ie diffusely reflected and/or directed reflected, from the front and back of the banknote and convert this into corresponding sensor signals.
  • the third sensor 23 located in the area of the front of the banknote detects the light emitted by a light source 24 and preferably hitting the banknote at an angle and passing through it passing through, ie transmitted, light and converts this into corresponding sensor signals.
  • the line with the sensor elements of the respective sensor 21, 22 or 23 runs essentially perpendicular to the transport direction T of the banknotes, so that with each reading process of the sensor line of the respective sensor 21, 22 or 23, a sensor signal curve is obtained along the sensor line, which corresponds to an intensity profile of the light that is transmitted or remitted by the banknote in a direction perpendicular to the transport direction T.
  • the sensor device 20 shown is preferably designed to check reflectance and/or transmission curves at different locations on a banknote.
  • one location on the banknote is illuminated with light from one of the light sources 24, 25 at a specific wavelength ⁇ and the light remitted or transmitted by the banknote is detected with one of the sensors 21, 22 or 23 and converted into corresponding sensor signals.
  • these sensor signals are then each divided by a reference signal determined using a white reference, whereby a standardized reflectance or transmission value is obtained at the location of the banknote at the wavelength ⁇ .
  • the banknote is successively illuminated with light of different wavelengths and the respectively remitted or transmitted light is detected.
  • several, up to (n-1) light sources can also be active at the same time.
  • the light sources 24 and 25 are clocked so quickly that the banknote has hardly moved despite the transport during a cycle in which all the different wavelengths are switched through, so that for all different wavelengths are measured at essentially the same location on the banknote. In this way, not only a possibly standardized reflectance or transmission value but also a possibly standardized reflectance or transmission curve is obtained for this point.
  • the sensor signals generated by the sensors 21 to 23 of the sensor device 20, in particular the corresponding reflectance or transmission curves, are forwarded to a control device 50 and an evaluation device 51.
  • the evaluation device 51 can be contained in the control device 50 or can also form a unit separate from the control device 50.
  • the evaluation device (51) has a memory function for storing previously calculated correction parameters that are used to calculate corrected sensor signals.
  • the sensor signals are used to check the banknote, with statements about various properties of the respective banknote being derived from the respective sensor signals, such as authenticity, degree of contamination, wear, defects and the presence of Foreign objects, such as adhesive strips.
  • the transport device 10 and the switches 11 and 12 are controlled along the transport route by the control device 50 in such a way that the banknote is fed to one of several output compartments 30 and 31 and stored there. For example, 30 banknotes that were recognized as genuine are stored in a first output compartment, while banknotes that are classified as inauthentic or suspected of being counterfeit are stored in a second output compartment 31.
  • the reference number 13 at the end of the transport route shown is intended to indicate that there are additional output compartments and/or other facilities, for example for storing or destroying banknotes, can be provided. If, for example, the examination of a banknote shows that it is genuine, but does not meet certain fitness criteria with regard to contamination, wear, defects or the presence of foreign objects, it can be sent directly to a shredder for destruction.
  • the value document processing system 1 further comprises an input/output device 40 for inputting data and/or control commands by an operator, for example using a keyboard or a touch screen, and outputting or displaying data and/or information about the processing process, in particular about the processed banknotes.
  • an input/output device 40 for inputting data and/or control commands by an operator, for example using a keyboard or a touch screen, and outputting or displaying data and/or information about the processing process, in particular about the processed banknotes.
  • corrected sensor signals in particular corresponding corrected reflectance or transmission curves, are preferably used to check the banknote, which reflect the actual reflectance or transmission behavior of the banknote much more accurately than the uncorrected reflectance or transmission curves. This is explained in more detail below.
  • Figure 2 shows an uncorrected reflectance curve 15 obtained with the sensor device 20 in the spectral range between approximately 400 and 1050 nm in comparison with a reflectance curve 16 measured with a calibrated spectrometer, which reflects the actual reflectance behavior of the location of the banknote under consideration.
  • the uncorrected reflectance curve 15 shows noticeable artifacts, which in this example appear as jagged reflectance peaks at approximately 590 nm and approximately 650 nm.
  • These reflectance peaks occur despite normalization of the reflectance curve 16 using reference signals that were determined on a white reference.
  • the invention achieves, among other things, that such reflectance peaks are eliminated from the reflectance curve 15 or at least significantly reduced, so that the corrected reflectance curve obtained here comes significantly closer to the actual reflectance curve 16.
  • Figure 3 shows a reflectance curve 17 corrected in accordance with the invention in the spectral range between approximately 400 and 1050 nm in comparison with the reflectance curve 16 measured with a spectrometer.
  • the course of the corrected reflectance curve 17 corresponds significantly better to the course of the reflectance curve 17 with the spectrometer measured reflectance curve 16 corresponds to that of the uncorrected reflectance curve 15 (cf. Fig. 2 ) the case is.
  • the spectral illumination distributions of LEDs correspond to laser-like Dirac functions at the corresponding wavelengths, that is, they have a "needle-shaped" spectral intensity distribution of the emitted light around a nominal wavelength.
  • the spectral illumination distributions of real LEDs usually have a certain extent around the nominal wavelength, so that the remission spectrum is somewhat smoothed.
  • This emission of light is also referred to as main emission in connection with the invention.
  • some LEDs, in addition to the main emission also show secondary emissions in completely different wavelength ranges, which change the shape of the remission curve in a surprisingly noticeable and particularly disturbing manner.
  • the approach according to the invention for correcting the remission or transmission curves is based, among other things, on the knowledge that disturbing artifacts, in particular remission or transmission peaks, can be caused by secondary emissions from the respective light sources, in particular LEDs.
  • the correction methods according to the invention for the mathematical elimination or at least reduction of these effects are explained in more detail below.
  • the original reflectance or transmission curves in the wavelength range of LEDs with secondary emissions could simply be smoothed, e.g. with a moving average over three reference points. Although this smoothes the representation of the curves in a simple and quick manner, it also potentially creates new artifacts, particularly in the case of highly structured remission or transmission spectra with steep edges.
  • a correction method is preferably used that takes physical properties into account in the emission, remission or transmission and detection processes.
  • the generated sensor signals for a reflectance curve are simulated with knowledge of the illumination distributions and the detector sensitivity distribution for all LEDs.
  • captured the sensor device 20 records both the main and secondary emissions of the light sources 24, 25 or the remission or transmission caused thereby.
  • I k ⁇ S k ⁇ D ⁇ r ⁇ d ⁇ , where S k ( ⁇ ) is the illumination distribution of channel k , i.e. the kth LED, D ( ⁇ ) is the detector sensitivity, i.e. the sensitivity of the sensor, and r ( ⁇ ) is the actual reflectance curve of the banknote.
  • the vector I is preferably normalized using a white balance.
  • the generated sensor signals i.e. the measured reflectance curves
  • the generated sensor signals can then be corrected as follows.
  • the remission vector r is mapped onto the (correct) sensor signals BR in the n radiation channels with the discretization at m wavelengths either without secondary emissions with A 0 , or alternatively via the measurement with secondary emissions (R) and their subsequent correction via the correction matrix B.
  • a + is the pseudoinverse of A.
  • n m
  • this method can be provided not only to remove the secondary emissions of the LEDs when creating A 0 , but also to replace their Gaussian-like or even asymmetrical distributions with discrete Dirac functions in the entries for the respective wavelength range. This has the advantage that the edges of the reflectance curves become steeper and therefore more precise.
  • the correction method described allows a reliable elimination or at least reduction of remission or transmission peaks due to secondary emissions from the light sources, so that it can be used in an advantageous manner - especially in sensor and / or evaluation devices with sufficiently high computing power.
  • a spectral correction is carried out by changing the shape of the remission spectrum. This correction is dynamic, i.e. the correction parameter depends not only on the systematic (static) alternating interference between the radiation source channels, but also on the current measured values of the radiation source channels involved.
  • a reliable correction of the sensor signals can be carried out in real time even with lower computing capacities.
  • LEDs are used to irradiate the banknote, each of which has at most one secondary emission, which is preferably close to a wavelength at which one or more of the other LEDs is or are available, which in turn preferably has or have no secondary emission .
  • the wavelength of the main emission of the other LED is shifted by less than 120nm from the wavelength of the secondary emission of the first LED, more preferably by less than 50nm, even more preferably by less than 10nm, depending on the desired spectral Resolution of the transmission or remission curves and the number of light sources.
  • the intensity I of the emission from two light sources 24, 24' is shown as an example.
  • the second light source 24 ' is required, which has a main emission with a wavelength that is the same or similar to the wavelength ⁇ 2 of the correcting secondary emission of the first light source 24.
  • LEDs with a main emission at 570 nm for example, it has been shown that there is often a secondary emission at 850 - 870 nm.
  • a second LED is therefore used for correction, which has a main emission at approx. 850 nm.
  • the correction parameter a a 2 / a 1 is preferably determined using two methods.
  • the a i are determined directly via the product of the measured spectral distributions of the light emission of the light source 24 with the measured sensitivity of the detector or detectors at the wavelength ⁇ i .
  • the intensities of the main and secondary emission of the first light source 24 with the secondary emission as well as the detector sensitivities at the wavelengths ⁇ 1 and ⁇ 2 must be measured.
  • the intensity of the further light source 24', which emits with its main emission in the range of ⁇ 2 does not necessarily have to be measured.
  • the actual reflectance of the test sample can be known using standard color charts, or can be determined by direct measurement with a spectrometer on the test sample.
  • the test sample preferably has sufficiently high reflectance values >0.2, particularly preferably >0.5, so that sufficiently high signal intensities and thus sufficient accuracy in determining a is achieved.
  • the invention also includes the variants and embodiments set out below.
  • the spectral illumination contributions can come not only from the main and secondary emissions of individual light sources, but also from simultaneous illumination of the document of value with at least two light sources with different spectral distribution.
  • the correction of the sensor signals according to the invention via the algorithm according to the invention enables a correct extraction of the remission or transmission curves.
  • LED A emits light in the UV range
  • LED B in the visible (VIS) or IR range.
  • the UV signal can then be determined without the banknote having to be irradiated solely by the UV LED.
  • the sensor device 20 is designed so that the banknote is always simultaneously irradiated with LEDs of different wavelength ranges.
  • the banknote can be illuminated simultaneously with the various overlays of LEDs A + B + C, of LEDs A + B, and of LEDs A + C one after the other.
  • the algorithm according to the invention can then be used as described above if the spectra of the individual LED light emissions are used by the spectra of the kth combined LED overlays.

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Claims (16)

  1. Dispositif pour la vérification de documents de valeur (3), en particulier de billets de banque, comportant
    - au moins deux sources de rayonnement (24, 25) pour l'émission de rayonnement électromagnétique, avec lequel un document de valeur (3) est irradié,
    - au moins un capteur (21 - 23) pour la détection du rayonnement électromagnétique réfléchi et/ou transmis par le document de valeur (3) et la génération de signaux de capteur (R) correspondants, comportant des composants (Rk) associés aux sources de rayonnement (24, 25), les signaux de capteur étant des signaux de réflexion et/ou de transmission correspondants, et
    - un dispositif d'évaluation (51), lequel est conçu pour vérifier les documents de valeur sur la base de signaux de capteur corrigés et pour dériver ces signaux de capteur corrigés (BR ; r 1) à partir des signaux de capteur en tenant compte d'au moins une propriété spectrale (Sk (λ), Ski ; ak , a) du rayonnement électromagnétique des au moins deux sources de rayonnement (24, 25), lors de la dérivation des signaux de capteur corrigés (BR ; r1) au moins une combinaison linéaire des composants (Rk) des signaux de capteur (BR ; r1 ) associés aux différentes sources de rayonnement (24, 25) étant formée,
    l'au moins une propriété spectrale (ak, a) du rayonnement électromagnétique de la source de rayonnement (24, 25) étant donnée par au moins un paramètre (ak , a), lequel caractérise une ou plusieurs parties spectrales du rayonnement électromagnétique de la source de rayonnement (24, 25), et
    au moins un premier paramètre (a1 ) caractérisant la partie spectrale d'une émission principale du rayonnement électromagnétique des sources de rayonnement (24, 25) et au moins un second paramètre (a2) caractérisant la partie spectrale d'une émission secondaire du rayonnement électromagnétique des sources de rayonnement (24, 25).
  2. Dispositif selon la revendication 1, l'au moins une propriété spectrale (Sk(λ), Ski ) du rayonnement électromagnétique des au moins deux sources de rayonnement (24, 25) étant donnée par au moins une distribution spectrale (Sk(λ), Ski ) du rayonnement électromagnétique d'au moins une source de rayonnement (24, 25).
  3. Dispositif selon la revendication 2, l'au moins une distribution spectrale (Sk(λ), Ski ) du rayonnement électromagnétique d'au moins une des au moins deux sources de rayonnement (24, 25) étant donnée par une première distribution spectrale (Sk(λ), Ski ) du rayonnement électromagnétique émis par au moins une des au moins deux sources de rayonnement (24, 25) et par une seconde distribution spectrale du rayonnement électromagnétique différente de la première distribution spectrale (Sk (λ), Ski ).
  4. Dispositif selon la revendication 3, la première distribution spectrale (Sk (λ), Ski ) correspondant à une distribution spectrale du rayonnement électromagnétique émis par au moins une des au moins deux sources de rayonnement (24, 25) comportant une émission principale et au moins une émission secondaire et la seconde distribution spectrale correspondant à la première distribution spectrale (S'k (λ), S'ki ) sans l'au moins une émission secondaire.
  5. Dispositif selon la revendication 4, la longueur d'onde de l'émission principale d'une seconde source de rayonnement (24, 25) étant décalée de moins de 120 nm, de préférence de moins de 50 nm, plus préférablement de moins de 10 nm de la longueur d'onde de l'émission secondaire d'une première source de rayonnement.
  6. Dispositif selon l'une des revendications 2 à 5, le dispositif d'évaluation (51) étant conçu pour déterminer les signaux de capteur (BR) corrigés par une multiplication des signaux de capteur (R) avec une matrice de correction (B), laquelle est dérivée à partir de l'au moins une distribution spectrale (Ski , k = 1 ... n, i = 1 ... m) du rayonnement électromagnétique d'un premier nombre (n) de sources de rayonnement (24, 25) à un second nombre (m) de longueurs d'onde discrètes (λi ) et d'au moins un tracé spectral (Di) de la sensibilité de l'au moins un capteur (21 - 23) pour rayonnement électromagnétique, et la matrice de correction (B) présentant au moins un élément non diagonal différent de 0.
  7. Dispositif selon la revendication 6, les distributions spectrales (Ski , i = 1 ... m) du rayonnement électromagnétique des sources de rayonnement (k = 1...n) individuelles n'étant pas toutes identiques ou étant toutes différentes.
  8. Dispositif selon la revendication 6 ou 7, la matrice de correction (B) correspondant au produit d'une seconde matrice (A 0) et d'une pseudo inverse (A+) d'une première matrice (A) (B = A0A + ), les éléments de matrice (Aki , k = 1 ... n, i = 1 ... m) de la première matrice (A) correspondant au produit de la première distribution spectrale (Ski , k = 1 ... n, i = 1 ... m) du rayonnement électromagnétique émis par le premier nombre (n) de sources de rayonnement (24, 25) à un second nombre (m) de longueurs d'onde discrètes (λi ) avec le tracé spectral (Di ) de la sensibilité de l'au moins un capteur (21 - 23) et d'une valeur standard de longueur d'onde (Δλ) entre respectivement deux longueurs d'onde discrètes (λi ), (Aki = Ski Di Δλ).
  9. Dispositif selon la revendication 8, les éléments de matrice de la seconde matrice (A0) correspondant au produit de la seconde distribution spectrale (S' ki ) du rayonnement électromagnétique avec le tracé spectral (Di ) de la sensibilité de l'au moins un capteur (21 - 23) et d'une valeur standard de longueur d'onde (Δλ) entre respectivement deux longueurs d'onde discrètes (λi , i = 1 ... m), (Aki = S' ki Di Δλ).
  10. Dispositif selon la revendication 1, le dispositif d'évaluation (51) étant conçu pour dériver les signaux de capteur corrigés (r1 ) à partir des signaux de capteur (R) en tenant compte du premier et d'un second paramètre (a1 , a2 ) ou d'un paramètre (a) dérivé à partir du premier et du second paramètre (a1, a2), lequel correspond en particulier au quotient (a 1/a 2) du premier et du second paramètre (a1 , a 2).
  11. Dispositif selon la revendication 10, le dispositif d'évaluation (51) étant conçu pour, lors de la dérivation des signaux de capteur corrigés (r1 ) à partir des signaux de capteur (R), tenir compte en outre d'une valeur (R 2) qui représente une mesure du rayonnement électromagnétique émis par le document de valeur (3), en particulier réfléchi et/ou transmis par le document de valeur (3), dans la plage de l'émission secondaire du rayonnement électromagnétique de la source de rayonnement (24, 25).
  12. Dispositif selon l'une des revendications précédentes, le dispositif d'évaluation (51) étant conçu pour normaliser (BR/BW ; r1 /w1) les signaux de capteur corrigés (BR ; r1 ) au moyen de signaux de référence corrigés (BW ; w1 ), les signaux de référence corrigés (BW ; w1 ) étant dérivés à partir de signaux de référence (W) qui sont générés par l'au moins un capteur (21 - 23) lors de la détection du rayonnement électromagnétique émis par un document de référence, en tenant compte de l'au moins une propriété spectrale (Sk (λ), Ski ; a 1, a2 ) du rayonnement électromagnétique des au moins deux sources de rayonnement (24, 25).
  13. Dispositif selon la revendication 12, le dispositif d'évaluation (51) étant conçu pour, lors de la dérivation des signaux de référence corrigés (BW) à partir des signaux de référence (W), tenir compte de la sensibilité de l'au moins un capteur (21 - 23) au rayonnement électromagnétique, en particulier sous la forme d'un tracé spectral (D(λ), Di ) de la sensibilité de l'au moins un capteur (21 - 23).
  14. Dispositif selon l'une des revendications précédentes, le dispositif d'évaluation (51) contenant une fonction de mémorisation pour conserver des paramètres de correction (B, ak, a) calculés à l'avance.
  15. Système de traitement de documents de valeur (1) comportant au moins un dispositif (2, 8,10 - 13, 30, 31, 50) pour traiter, en particulier pour transporter et/ou compter et/ou trier, des documents de valeur (3), en particulier des billets de banque, et un dispositif (21 - 23, 51) pour la vérification de documents de valeur (3) selon l'une des revendications précédentes.
  16. Procédé pour la vérification de documents de valeur (3), en particulier de billets de banque, au moyen d'un dispositif selon l'une des revendications 1 à 14 comprenant les étapes suivantes :
    - irradiation d'un document de valeur (3) avec un rayonnement électromagnétique d'au moins deux sources de rayonnement (24, 25),
    - détection du rayonnement électromagnétique réfléchi et/ou transmis par le document de valeur (3) et génération de signaux de capteur correspondants, comportant des composants associés aux sources de rayonnement, les signaux de capteur étant des signaux de réflexion et/ou de transmission correspondants, et
    - dérivation de signaux de capteur corrigés à partir de signaux de capteur en tenant compte d'au moins une propriété spectrale (Sk (λ), Ski ; ak , a) du rayonnement électromagnétique des au moins deux sources de rayonnement (24, 25), lors de la dérivation des signaux de capteur corrigés au moins une combinaison linéaire de composants des signaux de capteur associés aux différentes sources de rayonnement étant formée,
    l'au moins une propriété spectrale (ak, a) du rayonnement électromagnétique de la source de rayonnement (24, 25) étant donnée par au moins un paramètre (ak, a), lequel caractérise une ou plusieurs parties spectrales du rayonnement électromagnétique de la source de rayonnement (24, 25), et
    au moins un premier paramètre (a1 ) caractérisant la partie spectrale d'une émission principale du rayonnement électromagnétique des sources de rayonnement (24, 25) et au moins un second paramètre (a2) caractérisant la partie spectrale d'une émission secondaire du rayonnement électromagnétique des sources de rayonnement (24, 25) et
    - vérification des documents de valeur sur la base des signaux de capteur corrigés.
EP15791248.6A 2014-10-24 2015-10-23 Dispositif et procédé de vérification de documents de valeur, en particulier des billets de banque, et système de traitement de documents de valeur Active EP3210195B1 (fr)

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PCT/EP2015/002120 WO2016062409A1 (fr) 2014-10-24 2015-10-23 Dispositif et procédé de vérification de documents de valeur, en particulier des billets de banque, et système de traitement de documents de valeur

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US10109133B2 (en) 2018-10-23
DE102014015746A1 (de) 2016-04-28

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