EP3955222A1 - Procédé de vérification en temps réel de marques de sécurité à base de substance luminescente à l'aide d'un terminal mobile, ainsi que terminal mobile - Google Patents

Procédé de vérification en temps réel de marques de sécurité à base de substance luminescente à l'aide d'un terminal mobile, ainsi que terminal mobile Download PDF

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Publication number
EP3955222A1
EP3955222A1 EP21189399.5A EP21189399A EP3955222A1 EP 3955222 A1 EP3955222 A1 EP 3955222A1 EP 21189399 A EP21189399 A EP 21189399A EP 3955222 A1 EP3955222 A1 EP 3955222A1
Authority
EP
European Patent Office
Prior art keywords
security feature
luminescent
based security
excitation
ambient light
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.)
Pending
Application number
EP21189399.5A
Other languages
German (de)
English (en)
Inventor
Lazar KULIKOVSKY
Frank Morgner
Olga Kulikovska
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.)
Bundesdruckerei GmbH
Original Assignee
Bundesdruckerei GmbH
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 Bundesdruckerei GmbH filed Critical Bundesdruckerei GmbH
Publication of EP3955222A1 publication Critical patent/EP3955222A1/fr
Pending legal-status Critical Current

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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
    • 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
    • G07D7/20—Testing patterns thereon
    • G07D7/2008—Testing patterns thereon using pre-processing, e.g. de-blurring, averaging, normalisation or rotation
    • 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
    • G07D7/2016—Testing patterns thereon using feature extraction, e.g. segmentation, edge detection or Hough-transformation
    • 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

  • the present invention relates to a method for verifying the authenticity of a luminescent-based security feature using a mobile terminal device.
  • the invention also relates to a mobile terminal device with an application (app) for carrying out the method.
  • Valuable or security documents can be, for example, an ID document, a check card, a non-personalized authorization pass, such as a ticket or a means of payment, or a value or security element intended for product protection.
  • the authenticity checks are subject to the most varied of environmental conditions, in particular the most varied of lighting conditions, due to the use of the mobile end device. which can complicate the detection of phosphor-based security features.
  • the object of the invention is to specify a mobile terminal device for carrying out the method
  • the complexity of the component is reduced if the ambient light intensity is recorded by the camera itself.
  • a brightness sensor which is also assigned to the mobile terminal device and is also set up to record the ambient light intensity.
  • the at least one parameter for the excitation of the luminescent-based security feature is the distance between the image recording device and the luminescent-based security feature, and if the luminescent-based security feature can only be excited when the predetermined distance is present as a function of the radiation intensity of the ambient light .
  • Authenticity can therefore only be checked if the mobile terminal device is at a predefined distance from the luminescent-based security feature or the document of value to which it is attached. This distance varies as a function of the detected ambient light, with real-time detection of the ambient light intensity and real-time adaptation of the predefined distance for the excitation of the security feature preferably taking place. In this way, shadowing caused by the mobile device can be taken into account in real-time verification.
  • the at least one parameter for the excitation of the luminescent-based security feature is the luminosity of the lighting unit, and that an excitation of the luminescent-based security feature is only made possible when the luminosity specified as a function of the radiation intensity of the ambient light to Excitation of the luminescent-based security feature is present.
  • a reliable excitation of the luminescent-based security feature can also take place at greater distances, because of the The intensity emitted by the lighting unit is adjusted depending on the ambient light present.
  • the at least one parameter for exciting the luminescent-based security feature can be the exposure time.
  • exposure time is basically to be understood as the duration of illumination during which the illumination unit radiates light in the direction of the security feature.
  • real-time (image) capture can take place by means of the camera, with the image captured by the camera being output on the display of the mobile terminal device at the same time.
  • the image output on the display is preferably overlaid with a partially transparent mask which has a positioning frame adapted to the feature to be detected or a positioning contour adapted to the feature to be detected. It is particularly preferred that the dimensions of the positioning frame or the positioning contour are specified as a function of the detected radiation intensity of the ambient light. In this way, the authenticity can be verified under conditions that are specified and set as a function of the incident ambient light.
  • the luminescent-based security feature can only be excited when the positioning frame or the positioning contour in the image has been brought into congruence with the dimensions of the luminescent-based security feature.
  • An optimized distance between the camera and the security feature can thus be enforced, so that the authenticity can be checked more effectively.
  • the user-friendliness of the mobile terminal device for verifying the authenticity of the luminescent-based security feature is also increased in that the luminescent-based security feature is triggered automatically when the position frame or the position contour in the image has been brought into congruence with the dimensions of the luminescent-based security feature or with this in a different from 1 predetermined size ratio was set.
  • a white balance is carried out depending on the radiation intensity of the ambient light during or after the detection of the luminescent-based security feature.
  • At least one environmental parameter is additionally recorded by the mobile terminal and evaluated by the evaluation device.
  • the geographical position recorded by means of a GPS sensor, the movement information recorded by means of inclination sensors and/or acceleration sensors, and data on mechanical vibrations of the mobile terminal device come into consideration as environmental parameters.
  • the environmental parameters can thus be used to analyze the environment of the mobile terminal device and to draw conclusions that there is an anomaly with regard to at least one parameter relating to the environment (anomaly detection).
  • a luminescent-based security feature can also be evaluated as “forged” based on the detection of an anomaly in the surroundings.
  • the series of images or the video recording is preferably always captured for a predetermined minimum duration during a decay time of the emission of the luminescent-based security feature.
  • the decay behavior of the luminescent-based security feature can be examined and evaluated, with the decay curve or Emission curve is compared to a reference curve. If there is a discrepancy between the reference curve and the emission curve, a forged security feature containing a luminescent material or a value or security document with such a feature can likewise be inferred. The same applies to the cooldown time.
  • the corresponding reference values are stored, for example, in a digital memory that can be part of the mobile terminal device, or in an intelligent database on a remote server.
  • Emission detection and shape analysis are preferably carried out when assessing the authenticity of the luminescent-based security feature.
  • emission detection several images of an image series recorded by the camera are compared, with in particular an image difference between the recorded images and the reference image being determined, an RGB histogram being created, the hue value of different color channels being determined and the decay time of the phosphor being determined.
  • shape analysis the shape of the security feature is compared with a reference shape.
  • the phosphor is configured in such a way that it can be excited in the visible spectral range, in particular in the blue spectral range, so that the flash light source of the smartphone can deliver this excitation radiation. Furthermore, the phosphor is configured in such a way that it emits in the visible spectral range in order to ensure that it can be detected with the camera module of a commercially available smartphone. In addition, the phosphor is configured in such a way that its luminescence decays in the ms range after the flash excitation is completed, so that reliable verification is possible after the excitation has ended.
  • the phosphor of the phosphor-based security feature is a Ce 3+ or Mn 2+ co-doped silicate garnet phosphor.
  • the stationary luminescence of the phosphor When excited with the light of white-emitting LEDs, preferably at a maximum wavelength of 450 nm, the stationary luminescence of the phosphor has a broadband emission spectrum with several emission maxima in the visible range spectral range.
  • the white light of a lighting unit of a smartphone is generated by an LED, which consists of an LED semiconductor chip emitting at approximately 450 nm, for example, and one or more LED conversion phosphors placed above the LED semiconductor chip. These conversion phosphors are capable of converting the emission of the blue LED proportionately into longer-wave visible luminescence radiation (broadband emissions in the green, yellow and red spectral range) with an emission maximum of around 560 nm, for example.
  • the white light of the LED available as the lighting unit of commercially available smartphones results from the additive color mixture of the individual luminescence components described, with the blue spectral component having a significantly higher intensity.
  • the phosphor that can be used to provide the security feature according to the invention must preferably be configured in such a way that it has a high efficiency of spectral excitability, particularly in the range between 420 nm and 470 nm.
  • the maximum of the spectral excitability of the phosphor is particularly preferably at about 450 nm.
  • the smartphone camera is available as an image acquisition unit for detecting the luminescence signals of the phosphor.
  • the image acquisition unit is preferably equipped with a CMOS sensor and an IR filter. It therefore has a spectral sensitivity that covers the entire visible spectral range up to about 750 nm. Single images, image series or video recordings can be recorded by means of the image acquisition unit.
  • the phosphor used to create the security feature this means that it must be configured in such a way that, after the excitation has taken place, it emits with the highest possible intensity, preferably in the spectral range between 480 nm and 750 nm.
  • the mobile terminal device used according to the invention for verifying the authenticity of the security feature is preferably a conventional, commercially available smartphone that is equipped with a suitable application program (app). It is understandable for the person skilled in the art that the same functionality can also be integrated into a tablet or a similar multifunctional data processing device, for which purpose it must be equipped with a camera with an image acquisition unit and/or lighting unit and a data processing unit. Devices of this type that have the same effect should also be included in the invention.
  • the evaluation device is preferably a processor, in particular a microprocessor.
  • the processor comprises a digital memory in which a computer program (app) with software code sections is loaded or can be loaded directly, which causes the steps of the above method to be performed and runs through when the program is executed by the processor.
  • FIG. 1 shows a value or security document 100 in the form of a bank note, which includes a fluorescent-based security feature 102.
  • the security feature 102 can be used to verify the security document 100 .
  • the luminescent-based security feature 102 has a star shape here. The star shape is purely illustrative, it can therefore have any other shape.
  • the luminescent-based security feature 102 is arranged in the area of a visible feature 104, here in the form of the nominal value of the bank note.
  • the security feature 102 consists of a phosphor that can be excited to luminescence by means of electromagnetic radiation with a predetermined wavelength, as mentioned above.
  • the security feature 102 can be verified using a method in which the authenticity of the security feature 102 is checked, which will be discussed in more detail below.
  • FIG 2 shows a schematic arrangement for verifying the luminescent-based security feature 102, the security feature 102 being excited to luminescence by means of a lighting unit 204 of an image recording device 202 of a mobile terminal device 200, in particular a smartphone, in that the lighting unit 204 generates excitation light, in particular a flashlight.
  • the flashing light of the lighting unit 204 of the image recording device 202 is generated by means of an LED emitting white light.
  • the flash light has an intensity I A .
  • the phosphor of security feature 102 emits electromagnetic radiation, which occurs for a decay time in the ms range after excitation has ended.
  • the emission I E of the phosphor can be detected with a camera 204 or a detector of the image recording device 202 .
  • the camera 204 is set up to capture an ambient radiation I 0 of the daylight or room light that impinges on the security feature 102 and the bank note and is reflected on them.
  • the smartphone can also be equipped with a brightness sensor (photo sensor) in order to detect the radiant intensity of the ambient light.
  • the ambient radiation I 0 is to keep as low as possible during the detection process of the luminescent-based security feature 102, wherein a distance d between the security feature 102 and the smartphone is kept small. Due to the small distance d, which is preferably below the focusing range (focus) of the camera 206, the smartphone shields the ambient radiation I 0 for the most part, but this is not absolutely necessary in the method according to the invention.
  • FIG 3 a diagram with the rise and fall behavior of the phosphor used in the security feature 102 is shown.
  • An emission curve 300 of the security feature 102 excited to luminescence is shown in the diagram along a time axis t.
  • a flashlight excitation curve 302 is plotted along the time axis.
  • the flash excitation curve 302 rises sharply, holds its level for a short time, and then falls to zero after the flash goes off.
  • the phosphor of the security feature 102 is excited to luminescence by the electromagnetic radiation of the flash light, as a result of which its emission curve 300 rises almost simultaneously with the flash light emission curve 302, regularly with a reduced steepness.
  • the emission curve 300 drops significantly more slowly than the flash light excitation curve 302 after the flash light has gone out.
  • the decay behavior of the phosphor is in the ms range.
  • Individual images 304 of the security feature 102 captured by the camera 206 of the mobile terminal device 200 are also shown below the time axis.
  • the images 304 show the decaying emission of the security feature 102 as a pattern that becomes weaker over time. They can be used for verification of the security document 100 in a further method step.
  • a reference image 306 can be recorded as the last image of the recorded image sequence.
  • an additional reference image 308 can also be recorded before the activation of the excitation radiation (triggering of the flash).
  • An additional control of the security feature is possible, for example, by comparing the reference images 306 and 308 with one another.
  • the at least one parameter for the excitation of the luminescent-based security feature 102 is presently the distance d between the image recording device 202 and the luminescent-based security feature 102.
  • An excitation of the luminescent-based security feature 102 is only possible when the specified distance d as a function of the radiation intensity I 0 des ambient light is present.
  • the excitation luminosity I A is increased on the basis of the detected ambient light in such a way that a desired luminescence effect occurs.
  • excitation of the luminescent-based security feature 102 is only made possible when the positioning frame or the positioning contour 312 in the image has been brought into congruence with the dimensions of the luminescent-based security feature 102 .
  • excitation of the luminescent-based security feature 102 is only made possible when the positioning frame or the positioning contour 312 in the image with the dimensions of the luminescent-based security feature 102 has been placed in a predetermined size ratio that differs from 1; that is, if there is a predetermined difference in size between the positioning contour 312 and the shape of the security feature 102 .
  • the ambient light level I 0 was determined, with a high value for I 0 .
  • the mask 310 was chosen to be correspondingly small, which means that the smartphone has to be brought very close to the value or security document 100 in order to bring the contours of the security feature 102 and the positioning contour 312 either into alignment or into a suitably selected size difference .
  • the excitation of the luminescent-based security feature 102 is carried out automatically when the position frame or the position contour 312 in the image has been brought into alignment with the dimensions of the luminescent-based security feature 102 or has been set to a predetermined size ratio that differs from 1, as shown in the illustration after figure 5 for the case of congruence is illustrated.
  • the ambient light can be reduced with the method according to the invention and with the mobile terminal device 200 according to the invention Reliably take account of authenticity verification of the luminescent-based security feature 102, with the result that an improved and more reliable testing option is created.
EP21189399.5A 2020-08-04 2021-08-03 Procédé de vérification en temps réel de marques de sécurité à base de substance luminescente à l'aide d'un terminal mobile, ainsi que terminal mobile Pending EP3955222A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102020120567.8A DE102020120567B4 (de) 2020-08-04 2020-08-04 Verfahren zur echtheitsverifikation eines leuchtstoffbasierten sicherheitsmerkmals unter verwendung eines mobilen endgeräts sowie mobiles endgerät

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EP3955222A1 true EP3955222A1 (fr) 2022-02-16

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EP21189399.5A Pending EP3955222A1 (fr) 2020-08-04 2021-08-03 Procédé de vérification en temps réel de marques de sécurité à base de substance luminescente à l'aide d'un terminal mobile, ainsi que terminal mobile

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EP (1) EP3955222A1 (fr)
DE (1) DE102020120567B4 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7079230B1 (en) * 1999-07-16 2006-07-18 Sun Chemical B.V. Portable authentication device and method of authenticating products or product packaging
DE102018102015A1 (de) 2018-01-30 2019-08-01 Bundesdruckerei Gmbh Verfahren zur Verifikationsprüfung eines Sicherheitsdokuments mit einem gedruckten Sicherheitsmerkmal, Sicherheitsmerkmal und Anordnung zur Verifikation
DE102018109142A1 (de) 2018-04-17 2019-10-17 Bundesdruckerei Gmbh Verfahren zur Verifikation eines leuchtstoffbasierten Sicherheitsmerkmals
DE102018109141A1 (de) 2018-04-17 2019-10-17 Bundesdruckerei Gmbh Smartphone verifizierbares, leuchtstoffbasiertes Sicherheitsmerkmal und Anordnung zur VerifizierungSmartphone verifizierbares, leuchtstoffbasiertes Sicherheitsmerkmal und Anordnung zur Verifizierung
US10572638B2 (en) * 2014-07-10 2020-02-25 Bundesdruckerei Gmbh Mobile terminal for capturing biometric data

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7079230B1 (en) * 1999-07-16 2006-07-18 Sun Chemical B.V. Portable authentication device and method of authenticating products or product packaging
US10572638B2 (en) * 2014-07-10 2020-02-25 Bundesdruckerei Gmbh Mobile terminal for capturing biometric data
DE102018102015A1 (de) 2018-01-30 2019-08-01 Bundesdruckerei Gmbh Verfahren zur Verifikationsprüfung eines Sicherheitsdokuments mit einem gedruckten Sicherheitsmerkmal, Sicherheitsmerkmal und Anordnung zur Verifikation
DE102018109142A1 (de) 2018-04-17 2019-10-17 Bundesdruckerei Gmbh Verfahren zur Verifikation eines leuchtstoffbasierten Sicherheitsmerkmals
DE102018109141A1 (de) 2018-04-17 2019-10-17 Bundesdruckerei Gmbh Smartphone verifizierbares, leuchtstoffbasiertes Sicherheitsmerkmal und Anordnung zur VerifizierungSmartphone verifizierbares, leuchtstoffbasiertes Sicherheitsmerkmal und Anordnung zur Verifizierung

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DE102020120567A1 (de) 2022-02-10
DE102020120567B4 (de) 2022-07-14

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