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WO2019201839A1 - Procédé de vérification d'un signe de sécurité à base de luminophore - Google Patents

Procédé de vérification d'un signe de sécurité à base de luminophore Download PDF

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Publication number
WO2019201839A1
WO2019201839A1 PCT/EP2019/059635 EP2019059635W WO2019201839A1 WO 2019201839 A1 WO2019201839 A1 WO 2019201839A1 EP 2019059635 W EP2019059635 W EP 2019059635W WO 2019201839 A1 WO2019201839 A1 WO 2019201839A1
Authority
WO
WIPO (PCT)
Prior art keywords
image
emission
security feature
smartphone
phosphor
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.)
Ceased
Application number
PCT/EP2019/059635
Other languages
German (de)
English (en)
Inventor
Lazar KULIKOVSKY
Detlef Starick
Manfred Paeschke
Jörg Fischer
Frank Fritze
Ilya Komarov
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
Priority to EP19722517.0A priority Critical patent/EP3782136B1/fr
Priority to CN201980026799.2A priority patent/CN111989721B/zh
Publication of WO2019201839A1 publication Critical patent/WO2019201839A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • 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 Veri fication of a security feature.
  • WO 2012/083469 A1 discloses a device for authenticating documents marked with photochromic systems.
  • the photochromic security feature exhibits a change in color and / or a change in shape under the effect of a flashlamp excitation. It is further described that the security feature is based on a retinal protein.
  • WO 2013/034471 A1 describes a device for recognizing a document which has a security feature with wavelength conversion properties.
  • a light generating device is provided, which irradiates the security feature with excitation light, as well as an image pickup device which receives the light emitted by the security feature.
  • WO 2013/034603 A1 describes a method for verifi cation of a security document with a security feature in the form of a fluorescent printing element.
  • the method provides that the printing element is excited by means of a light source and thereby emits an electromagnetic radiation, which in a further step by means of a Sensor is detected. By comparing with given data, the collected data is evaluated. The verification result will be issued in a further step depending on the result of the comparison.
  • the method should be performed with a smartphone, the flash module of the smartphone as the excitation source and the photosensor of the camera of the smartphone as a detection unit are used.
  • the device includes a camera module, a processor unit and a display.
  • Smartphones can be done after completing the suggestion.
  • An object of the present invention is therefore to provide an improved method for the verification of a fluorescent-based security feature.
  • the security feature should be detectable by means of an image capture unit of a smartphone and verifiable with the verarbei processing unit of the smartphone.
  • verification should not only examine the presence of an emission but also specific characteristics of the emission.
  • a general solution to the above task, which the invention implements, is first of all that a security feature with a specific phosphor equipped, which avoids the problems described above.
  • This phosphor must be configured so that it is on the one hand with a light source of a smartphone or a similar mobile computing device, ie in particular a flash LED of a smartphone, excitable. At the same time, the phosphor must be one
  • Luminescence Lumineszenzausbeute, cooldown
  • the cooldown and emission during decay must be distinguishable from other phosphors and, in addition, the decay
  • Luminescence signals can not be visually perceived by humans. It has been found that these conditions are only met by a few, specifically configured phosphors that can be used in safety features. Such a phosphor must in particular have a cooldown in the ms range.
  • a suitable phosphor is described in German Patent Application DE 10 201 8 109 141.9 entitled “Smartphone Verifiable Fluorescent-based Security Feature and Arrangement for Verification” filed by the Applicant on the Same Priority Date (Apr. 17, 2017) The content of this further patent application , in particular with regard to the composition and the
  • the method according to the invention serves for the verification of a fluorescent-based emission-activatable security feature which is arranged on a security document.
  • the method can be executed by means of a smartphone or a similar mobile terminal, which is provided by a Software, preferably in the manner of an app is configured and controlled accordingly.
  • An evaluable by the inventive method safety feature is applied to a security document or introduced into this and includes the o.g. Phosphor.
  • the phosphor can be excited by an electromagnetic radiation of predetermined wavelength for luminescence, whereupon it emits radiation.
  • the emission of the phosphor has a cooldown in the ms range.
  • the cooldown in the range between 1 to 100 ms, especially before given to in the range between 5 to 50 ms, more preferably selected between 10 and 30 ms.
  • the emission of the phosphor can be detected by means of an image acquisition unit of a smartphone.
  • the security document is positioned so that the security feature is detected by a picture-taking unit of the smartphone.
  • this is done by manual positioning of the security document in front of the image acquisition unit.
  • a semi-transparent mask or a position frame in the display of the mobile terminal is shown as a user support, which serves as a position aid.
  • the security document may have a human visually recognizable tag positioned within the position frame. The security feature is then located near this tag so that it is within the detection range of the image capture unit.
  • object recognition can be carried out by means of the image capture unit and a data processing unit of the smart phone (mobile terminal).
  • the object detection indirectly serves to determine the position of the security feature on the document and / or to help position the smartphone over the security
  • the object recognition can also be used for automatic triggering of the detection.
  • a capture frame or a capture window is defined, wherein its position is defined on the basis of the previously determined position of the security feature and wherein the capture frame is selected such that the security feature is arranged in the region of the capture frame.
  • the security feature by means of a lighting unit of the smartphone (mobile terminal) is stimulated to luminescence, so that the security feature electromagnetic radiation
  • Lighting unit and image acquisition unit controlled by the data processing unit of the smartphone, wherein a combination of single flash and video recording or single flash and continuous shooting takes place and the lighting unit is switched off after the stimulation of the phosphor of the security feature, so that after the end of the flash the decaying
  • Emission can be recorded by the image acquisition unit.
  • An optional method step provides that a reference area is defined, which is located immediately adjacent to the security feature.
  • the evaluation of captured images of the security feature and the reference area as well as the differences recorded there may be useful for verification of the document in high flicker ambient light.
  • an image series or a video of the security feature and optionally of the reference area is recorded by means of an image capture unit of the smartphone in order to detect the emission.
  • the recording takes place in the specified recording area. The detection of the emission occurs after completion of the excitation, i. to
  • the recording time of the image series recorded by the image acquisition unit or the video is preferably selected so that in the last image of the image series or video no emission of the security feature is more detectable, provided that the predetermined decay times of the phosphor of the security feature are met.
  • This last image is taken as a reference image (B ref) .
  • a start image can be recorded, which can be included as a further reference in the verification.
  • the recorded or recorded image series or videos are recorded by means of the data
  • Reference data compared In the simplest case, reference data are stored in the smartphone that match the ones determined
  • the image differences between the captured images and the detected after the emission has subsided
  • the emission values are calculated as the hue value of the different color channels by means of an RGB histogram, and then the decay time of the phosphor is calculated analyzed data.
  • n 10 images are used for the calculation of the image difference.
  • the number of images is between 5 and 15 images.
  • At is the time interval between the pictures
  • These values can be determined from a histogram of the images or the image difference.
  • the spectral distribution of the emission of the phosphor can be determined from the color coordinates for different images, where:
  • the comparison enables the presence of the security feature in the area of the capture frame to be verified and the authenticity of the security document to be checked following.
  • verification of the security feature on the security document can verify the authenticity and integrity of the security document.
  • the reference image which is the last image in the image series, is generated in a predetermined time frame, in particular in the ms range, as a result of which emissions with decay times greater than the ms range are likewise filtered out. For this, the reference image can be compared with the before activation of the excitation
  • the authenticity of the security feature is in an Off
  • the take-up speed in generating the image series is selected so that fluorescent phosphors or features with short cooldowns, i. in the ys range can be excluded as non-verifiable because such short emissions are not detected with sufficient intensity.
  • phosphors are excluded with long decay times as unverifiable. If one of the two preceding features points to a fluorescent or phosphorescent phosphor, the result of the authenticity of the security feature is output as "false".
  • the outer shape of the security feature can be checked.
  • the spectral distribution of the radiation emitted by the luminous substance as well as the decay time of the luminous substance of the security feature are checked
  • the optional object recognition preferably comprises various image processing steps, such as noise reduction, contrast adjustment or color channel filter applications
  • the noise reduction can be done for example by means of morphological filters such as erosion or dilatation.
  • morphological filters such as erosion or dilatation.
  • shape analysis a template matching can be used.
  • FFT fast Fourier transform
  • the distance between the security document with the security feature and the image capture unit of the smartphone is selected to be less than or equal to the distance of the focus range of the image capture unit. There is no optical focus or a
  • the distance between the smartphone camera and the security feature when capturing the images can thus be chosen to be very small, since no sharp images are required for the present process because only the emission and, if necessary, the shape of the image
  • the small distance between the security feature and the camera has the advantage that more energy is available for the excitation of the phosphor of the security feature, and that the emission of the phosphor is detected over a wide solid angle.
  • the minimization of the distance between camera and security feature is particularly significant due to the quadratic dependence of the intensity of the flash light on the distance to the excitation source or the emission from the distance to the detection unit.
  • a comparatively low emission can be detected, which would no longer be detectable when recording in the focus range. This reduces the false rejection rate (ie a true security document is rated as wrong).
  • Smartphones for example, have a focus range of 60 mm.
  • a distance between 10 mm and 80 mm between the image capture unit and the security document with security feature for receiving the images is used for the method.
  • the distance during imaging between the image capture unit and the security document with the security feature is less than 50 mm.
  • blurred images is to reduce the resolution of the images and thus the editing of the images
  • a reference area next to the area of the security feature that is selected in addition to the area of the phosphor.
  • the two areas have the same visible body color.
  • the fluctuation of the exposure during the recording in artificial light 50 Hz flickering
  • the positions of the phosphor and the reference region are on predefined to the security document (eg, relative to a prominent character on the document). For verification, an equal number of pixels in both ranges will be used for all
  • Spectral range is detected a characteristic color shift, which can also be used as authenticity criterion.
  • a further advantage of the method is that the known and existing in a variety of users smartphone can be used as a mobile terminal for verification of the security feature. It will provide a quick, internal evaluation and authentication of the smartphone
  • the distance between the security feature and the image capture unit can be kept low, since at the same time covering the security feature against ambient light, such as daylight or room light occurs.
  • the method with its method steps is preferably provided as an application or app for the smartphone.
  • the frame rate of the image sensor used determines a lower limit, which must be achieved by the decay behavior of the phosphor.
  • An upper limit is given by the physiological properties of the human eye, in particular by the visual perception, ie the reception and processing of optical stimuli by the eye and the brain.
  • the emission of the security feature should not be detectable by human visual perception.
  • the cooldown of the luminescent substance should be less than 1 s, since from 1 s a afterglow of the
  • the phosphor takes place, which is perceptible by humans.
  • the phosphor is chosen so that its decay time is in the single-digit or two-digit ms range.
  • the decay time of the phosphor (always considered from switching off the excitation source) of the security feature is in the range of 1 ms to 50 ms.
  • the phosphor of the security feature particularly preferably has a decay time of 10 ms to 30 ms.
  • the security feature device by means of a mobile device (especially smartphone) can be detected, is the
  • Fluorescent configured so that it is excitable in the visible spectral range, especially in the blue spectral range, so that the flash light source of the smartphone can deliver this excitation radiation. Furthermore, the phosphor is configured to emit in the visible spectral region, which emission due to the short decay time is not detectable by the user by visual perception.
  • the white light of the illumination unit of a smartphone is generated by an LED which consists of an LED semiconductor chip with an emission at about 450 nm and LED conversion phosphors placed above the LED semiconductor chip, the conversion phosphors emitting the emission of the LED blue LED proportionally in long-wavelength visible luminescence radiation (broadband emission in the green, yellow and red spectral range) with an emission maximum of, for example, about 560 nm convert.
  • the white light of the LED as an illumination unit of commercially available smartphones results from the additive color mixing of the described individual luminescence components, the blue spectral component having the higher intensity.
  • the phosphor which can be used for providing the security feature according to the invention preferably has to be configured in such a way that it has a high spectral excitability, in particular in the range between 420 nm and 470 nm.
  • the phosphor has an effective excitation wavelength of 450 nm.
  • the smartphone camera is available as image capture unit.
  • the image capture unit is a CMOS sensor equipped with an IR filter, whereby a spectral sensitivity to about 750 nm exists.
  • CMOS sensor equipped with an IR filter, whereby a spectral sensitivity to about 750 nm exists.
  • test equipment can be used as a retrofit module for stationary testing (eg in ATMs) or preferably designed as a mobile terminal device.
  • the mobile terminal is preferably a smartphone, but can also be a tablet or another
  • Lighting unit and a data processing unit comprises.
  • the data processing unit is a Processor, in particular a microprocessor.
  • the test can also be performed with stationary terminals or other data processing systems with image acquisition units (eg desktop monitors or service terminals).
  • the phosphor in the security feature is so
  • the phosphor in particular the luminescent pigments of the phosphor, are preferably brought to a support as a defined pattern.
  • the pattern may be arranged as a shape, for example a triangle or a star.
  • the security feature pattern formed by the phosphor may include data and be arranged as a code, such as a QR code.
  • the pigments of the phosphor are a security feature, for example, on a security document or on a
  • Printing on or applying the phosphor to the security document can be done with known printing methods such as printing.
  • the phosphor can be applied to the security document by coating methods or laminating methods.
  • a security document with the security feature it can be arranged, for example, in a region of another security feature, such as a figure.
  • the security feature can be applied to different security documents, for example, a banknote, a passport, a passport, a driver's license, a ticket, a stamp or the like.
  • FIG. 1 shows an embodiment of a security feature according to the invention on a banknote
  • FIG. 2 shows a schematic representation of components of an arrangement according to the invention for verification of the security feature
  • Fig. 3 is a diagram with the arrival and decay of a
  • Arrangement. 1 shows a security feature 01 according to the invention, which is applied to a value document, namely a symbolically represented security document 02 in the form of a banknote.
  • the security feature can be used to verify security document 02.
  • the security feature 01 here has a star shape. It is positioned below a visible feature 03, here the face value of the money.
  • the security feature 01 consists of a stimulable by means of electromagnetic radiation with reimburse wavelengths for luminescence phosphor, as mentioned above and is explained in detail in the incorporated further patent application of the Applicant.
  • the security feature 01 can be verified by means of a method, the authenticity of the security feature 01 being checked.
  • FIG. 2 shows a schematic arrangement for verifying the security feature 01, the security feature 01 being excited by means of a lighting unit 04 of an image acquisition unit 06 of a mobile terminal, in particular a smartphone 07, for luminescence by the illumination unit 04 generating excitation light, in particular a flashlight 08 ,
  • the flashlight 08 of the image pickup unit 06 is generated by means of a white light emitting LED.
  • the flash 08 has an intensity I A.
  • the phosphor of security feature 01 emits electromagnetic radiation that occurs after the excitation has ended for a cooldown in the ms range.
  • the emission I E of the phosphor can be detected with a camera or a detector 09 of the image acquisition unit 06. Furthermore, the detector 09 detects an incident on the security feature 01 and the bill 02 and reflected at this Ambient radiation Io of daylight or room light.
  • Ambient radiation Io is kept low in the process according to the invention, since a distance d between the security feature 01 and the smartphone 07 can be kept low. Due to the small distance d, which is preferably below the focus range (focus) of the image pickup unit 06, the smartphone 07 largely shields the ambient radiation Io.
  • Fig. 3 is a diagram with the arrival and decay of the phosphor, which is used in the security feature 01, shown.
  • the diagram shows an emission curve 11 of the luminescence-stimulated security feature 01 along a time axis t. Furthermore, a flashlamp excitation curve 12 is plotted along the time axis.
  • the flare excitation curve 12 rises sharply, holds its level for a short time and drops to zero after the flashlight
  • the electromagnetic radiation of the flashlight excites the luminescent substance of the security feature 01 for luminescence, as a result of which its emission curve 11 increases almost simultaneously with the flashlight emission curve 12, regularly with reduced steepness.
  • the emission curve 11 drops significantly more slowly than the flashlight excitation curve after the flashlight goes out.
  • the decay behavior of the phosphor is according to the invention in the ms range.
  • FIG. 2 Below the time axis, individual images 13 of the security feature 01 captured by the detector 09 of the smartphone 07 (FIG. 2) are shown in FIG.
  • the images 13 show the decaying emission of the security feature 01 as a weakening pattern over time. You can for verification of the security document 02 in another Process step can be used. After essentially complete decay of the emission, a reference image 14b can be detected as the last image of the recorded image sequence.
  • an additional reference image 14a can also be recorded before the activation of the excitation radiation (triggering of the flash). Additional control of the security feature is possible, for example, by comparing the reference images 14a and 14b with each other.
  • FIG. 4 shows in a simplified form the basic sequence of the verification of the security feature 01 using the arrangement shown in FIG. 3.
  • Positioning step 41 the secure document to be verified is positioned so that it can be reliably detected by the image capture unit of the smartphone.
  • the start image 14a of the security feature is generated even before the triggering of the flashlight excitation of the smartphone.
  • a detection step 43 with the aid of the image recording unit
  • the contrast adjustment and the histogram analysis of the different color channels are brought to use, in order to achieve both the spectral emission and the exclusive decay characteristic of the invention used phosphor to verify.
  • object recognition can be performed.
  • the authenticity of the checked security document can be confirmed in a release step 45.
  • the security feature preferably stored in the data memory of the smartphone

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Inspection Of Paper Currency And Valuable Securities (AREA)
  • Investigating, Analyzing Materials By Fluorescence Or Luminescence (AREA)
  • Credit Cards Or The Like (AREA)

Abstract

L'invention concerne un procédé de vérification d'un signe de sécurité à base de luminophore, ledit signe de vérification contenant un luminophore pouvant être excité pour générer une émission, au moyen d'un téléphone intelligent. Dans une première étape, le luminophore du signe de sécurité est excité pour générer une émission, au moyen d'une unité d'éclairage du téléphone intelligent. L'émission est détectée une fois l'excitation terminée, pendant un temps d'extinction prédéfini, par enregistrement d'une série d'images ou d'un enregistrement vidéo avec un ensemble d'acquisition d'images du téléphone intelligent. Pour finir, la série d'images ou l'enregistrement vidéo est évalué(e) au moyen d'une unité de traitement de données du téléphone intelligent, l'émission détectée pendant le temps d'extinction étant comparée à des données de référence mémorisées, afin de vérifier l'authenticité du signe de sécurité.
PCT/EP2019/059635 2018-04-17 2019-04-15 Procédé de vérification d'un signe de sécurité à base de luminophore Ceased WO2019201839A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP19722517.0A EP3782136B1 (fr) 2018-04-17 2019-04-15 Procédé de vérification d'un signe de sécurité à base de luminophore
CN201980026799.2A CN111989721B (zh) 2018-04-17 2019-04-15 用于验证基于发光材质的安全特征的方法

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102018109142.7A DE102018109142A1 (de) 2018-04-17 2018-04-17 Verfahren zur Verifikation eines leuchtstoffbasierten Sicherheitsmerkmals
DE102018109142.7 2018-04-17

Publications (1)

Publication Number Publication Date
WO2019201839A1 true WO2019201839A1 (fr) 2019-10-24

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PCT/EP2019/059635 Ceased WO2019201839A1 (fr) 2018-04-17 2019-04-15 Procédé de vérification d'un signe de sécurité à base de luminophore

Country Status (4)

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EP (1) EP3782136B1 (fr)
CN (1) CN111989721B (fr)
DE (1) DE102018109142A1 (fr)
WO (1) WO2019201839A1 (fr)

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