EP4086864B1 - Procédé et dispositif de vérification optique d'un composant d'un document identification de valeur ou de sécurité - Google Patents

Procédé et dispositif de vérification optique d'un composant d'un document identification de valeur ou de sécurité

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Publication number
EP4086864B1
EP4086864B1 EP22170185.7A EP22170185A EP4086864B1 EP 4086864 B1 EP4086864 B1 EP 4086864B1 EP 22170185 A EP22170185 A EP 22170185A EP 4086864 B1 EP4086864 B1 EP 4086864B1
Authority
EP
European Patent Office
Prior art keywords
light
component
value
identification
security document
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.)
Active
Application number
EP22170185.7A
Other languages
German (de)
English (en)
Other versions
EP4086864A1 (fr
Inventor
Rötzer Martin
Michael Langgassner
Ulrich Bielesch
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 EP4086864A1 publication Critical patent/EP4086864A1/fr
Application granted granted Critical
Publication of EP4086864B1 publication Critical patent/EP4086864B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
    • G07D7/00—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency
    • G07D7/06—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency using wave or particle radiation
    • G07D7/12—Visible light, infrared or ultraviolet radiation
    • G07D7/121—Apparatus characterised by sensor details

Definitions

  • the invention relates to a device and a method for the optical verification of at least one component of an identification, value or security document, in particular for the optical testing of the quality of a hologram film exposed with a hologram.
  • Identification, security, or other documents serve to verify the identity of a person or object, or a claim, such as for payment of a sum of money, delivery of a product, or provision of a service. To this end, it must be ensured that the document cannot be imitated, forged, or altered, or only with considerable effort. Therefore, the document often contains security features that are extremely difficult or even practically impossible to replicate. For example, like banknotes, the document may be made of a material that is not readily available.
  • security features can be created using special inks, such as luminescent or optically variable inks; optical elements, such as reversible images, kinegrams, lens or prism arrays; as well as guilloches, melier fibers, security threads, and other techniques. Furthermore, it is often necessary that identification, security, or other documents be easy to produce and that they can be read by visually impaired individuals.
  • One way to forge an ID, security, or other identification document is to alter person- and/or document-specific areas by adding or removing layers.
  • a final transparent top layer is applied, which is further protected by the inclusion of holograms (volume reflection holograms). Manipulation can be prevented.
  • the efficiency of light diffraction at the hologram film is a measure of visual perceptibility.
  • the efficiency of light diffraction is spectrally unevenly distributed and has a maximum near the exposure wavelength used or the master matrix. It is determined by the spatial shape of the exposed, impressed, or inscribed interference patterns in the substrate film.
  • This document describes a device for testing holograms on identification, security, or other documents. It incorporates three different light sources, which are focused into a single beam via deflecting mirrors. This beam is then directed through a lens onto the document to be tested, using a deflecting mirror. The reconstructed light from the security document is then detected by three photodetectors positioned at different angles.
  • the GB 2 355 522 A and the US 2010 / 0128964 A1 They describe an arrangement for checking banknotes, each consisting of multiple light emitters to illuminate the banknote with different wavelengths. The transmitted and reflected components of the light are optically detected, and the banknote is then checked for counterfeiting.
  • the diffraction efficiency is defined as the ratio of the intensity emitted by a diffractive optical element (DOE) is diffracted into a specific solid angle, to the intensity incident on the element.
  • DOE diffractive optical element
  • the device according to the invention for the optical verification of at least one component of an identification, security, or other document, in particular for testing a hologram film exposed with a hologram has a detection chamber into which at least the component, in particular the hologram film, can be inserted.
  • the device is provided with a set of light emitters configured to emit light in the direction of the component of the identification, security, or other document, of which at least one first light emitter is configured to emit light from a first wavelength range, and of which at least one second light emitter is configured to emit light from a second wavelength range that differs from the first.
  • a photodetector is directed towards the detection chamber and is configured to detect light transmitted through the component of the identification, security, or other document.
  • the present invention uses a number of light emitters with different emission wavelengths sequentially to illuminate a film sample or a component of an identification, security, or other document. This allows for an evaluation of the quality of the exposed film, enabling real-time assessment of the quality of the film material and the exposure process. Since the hologram film is usually provided on a film reel and passes through the exposure chamber in a continuous path, rapid verification of its quality is possible.
  • Verification of the exposed hologram film is necessary to avoid the production of unnecessary rejects in subsequent processing steps.
  • the device can thus also be used in an exposure unit during production. During verification, the transmission is measured; therefore, the device functions as a type of transmission photometer.
  • a fast and reliable—albeit coarse—determination of the peak wavelength within the selected spectral range and the diffraction efficiency can be performed without expensive specialized equipment such as spectrometers.
  • the underlying material sample can therefore be irradiated with different wavelengths quasi-simultaneously, and its corresponding response recorded, for example, using a rapid sequence of single flashes.
  • each of the light emitters comprises an axis of symmetry of its light emission, which intersects with the other axes of symmetry of the other light emission points at a common intersection point.
  • This common intersection point is located upstream of the detection area.
  • Such crossed or converging beam paths of the emitters allow the amplitude (intensity) and the spectral position to be determined photometrically. This makes it possible to infer the diffraction efficiency of the hologram at the position of the component or film section of the identification, security, or other document under investigation.
  • the ratio of a first intensity at an unexposed area of the component or hologram film to a second intensity at an exposed area, which is therefore being tested, can be calculated, resulting in an efficiently evaluable relative measurement.
  • the intersection point lies on the surface or within the volume of an optical diffuser positioned upstream of the detection area.
  • This diffuser element ensures that the component of the identification, security, or other document being inspected is diffusely illuminated by the different wavelengths of the light emitters.
  • the diffuser element thus serves to homogenize the initially differing directions of incidence and intensity distributions of the light emitters.
  • an optical tube positioned upstream of the detection chamber, particularly in the light emitter's beam path.
  • This tube can be located between the diffuser and the detection chamber.
  • the diffuser element in conjunction with the subsequent tube, homogenizes the light emitted by the light emitters at the exit side. This reduces the angle of incidence observed by the photodetector.
  • the LEDs used have an inhomogeneous light field with respect to direction and intensity distribution. Therefore, it is also beneficial to have an additional aperture downstream of the tube.
  • the photoamplifier sequentially determines the respective intensity of the transmitted light from each of the light emitters, which can then be temporarily stored and compared with reference values, particularly predefined or previously calibrated ones. Specifically, this process converts the photocurrent generated by the photodetector, which is proportional to the illumination intensity, into a proportional voltage that can be easily digitized.
  • the light emitters are, for example, particularly narrowband light-emitting diodes (LEDs), for which the spectral characteristics, specifically peak wavelength and full width at half maximum (FWHM), are preferably known.
  • LEDs narrowband light-emitting diodes
  • FWHM full width at half maximum
  • laser light sources or broadband light sources with suitable filters can also be used as light emitters.
  • a photodiode is preferably used as the photodetector. Since the supplied voltage is not proportional to the generated photocurrent, an I/V converter is preferably employed. The photocurrent is proportional to the intensity.
  • the photoamplifier is also available as a photodiode amplifier, which demonstrates its advantages in its efficient interaction with the photodiode.
  • the photodiode amplifier is further characterized by its speed, its linear behavior, and its Adaptability to the input voltage range of an analog-to-digital converter (A/D converter).
  • the set of light emitters in a chamber wall in such a way that the light is emitted into the interior of the chamber. From this chamber, the light is then directed exclusively towards the detection area. Furthermore, it is possible to determine the dark current when the emitters are switched off and subtract it from the measurement signal during flash operation, ensuring that a certain amount of residual light, which remains constant over time, does not interfere with the measurement or verification of the component.
  • control system makes sense, once the control system is set up, to cause the light emitters to emit light sequentially towards the detection area. emit.
  • This sequence of on/off instructions (signals) for the light emitters can be initiated very quickly by the controller, which, in particular, is a CPU or a microcontroller, can in turn very quickly process the response signal detected by the photodetector or photoamplifier.
  • the controller which, in particular, is a CPU or a microcontroller, can in turn very quickly process the response signal detected by the photodetector or photoamplifier.
  • SoC System on a Chip
  • each light emitter has a symmetry axis of its light emission that intersects the other symmetry axes of the other light emission points at a common intersection, with the light rays meeting at this common intersection point even before they enter the detection area.
  • predefined conditions for authentication are met.
  • the photodetector can thus very efficiently detect each individual light source.
  • the intersection point is located particularly on the surface or in the volume of an optical diffuser positioned in front of the detection area.
  • the set of light emitters is embedded in a wall of a chamber, and if the light is emitted into the interior of the chamber. In this way, the wall can be used to block out ambient light.
  • the light emitters emit light sequentially towards the detection area. Therefore, to perform a simple – and thus very efficient – relative measurement, the respective intensity of the transmitted light from each of the light emitters can be sequentially determined and temporarily stored using a photointensifier. This is first done on an unexposed area of the sample and then on an exposed area, resulting in the relative measurement.
  • Examples of acceptable identification, security, or other documents include a passport, identity card, driver's license or other ID card or access control card, vehicle registration certificate, vehicle title, visa, check, other means of payment, in particular a banknote, check, bank, credit or cash payment card, customer card, health card, chip card, company ID, proof of authorization, membership card or other ID document.
  • the individual component When an identification, security, or other document is tested using transmission measurement, the individual component can be examined in the document's unassembled form, for example, as an exposed and fixed film within a photopolymer sheet.
  • the component or hologram can also be subjected to transmission measurement even if the identification, security, or other document is already a laminated unit with a window through which the transmission measurement can be performed.
  • the identification, valuables, or security document is in ID 1, ID 2, ID 3, or any other format, for example, in booklet form, similar to a passport-like item.
  • the identification, valuables, or security product is generally a laminate of several document layers that are precisely bonded together under heat and increased pressure. These products should meet standardized requirements, such as ISO 10373, ISO/IEC 7810, and ISO 14443.
  • the product layers consist of a carrier material suitable for lamination.
  • the identification, value, or security document can, however, preferably be formed from a polymer selected from the group comprising polycarbonate (PC), in particular bisphenol A polycarbonate or a polycarbonate formed with a geminal disubstituted bis(hydroxyphenyl) cycloalkane, polyethylene terephthalate (PET), its derivatives, such as glycol-modified PET (PETG), polyethylene naphthalate (PEN), polyvinyl chloride (PVC), polyvinyl butyral (PVB), polymethyl methacrylate (PMMA), and polyimide (PI).
  • PC polycarbonate
  • PET polyethylene terephthalate
  • PET polyethylene terephthalate
  • PET polyethylene terephthalate
  • PET polyethylene terephthalate
  • its derivatives such as glycol-modified PET (PETG), polyethylene naphthalate (PEN), polyvinyl chloride (PVC), polyvinyl butyral
  • Polyvinyl alcohol PVA
  • polystyrene PS
  • polyvinylphenol PVP
  • polypropylene PP
  • polyethylene PE
  • thermoplastic elastomers TPE
  • TPU thermoplastic polyurethane
  • ABS acrylonitrile butadiene styrene copolymer
  • the product can also be made from several of these materials. Preferably, it consists of PC or PC/TPU/PC.
  • the polymers can be either filled or unfilled. In the latter case, they are preferably transparent or translucent. If the polymers are filled, they are opaque.
  • the foregoing refers both to films to be bonded together and to liquid formulations that are applied to a precursor, such as a protective or topcoat.
  • the product is made from three to twelve, preferably four to ten films.
  • the films can also bear printed layers.
  • a laminate formed in this way can then be coated on one or both sides with a protective or topcoat, or with a film.
  • the film can be, in particular, a scratch-resistant film. Overlay layers formed in this way protect an underlying security feature and/or give the document the necessary abrasion resistance.
  • the identification, valuables, or security document has a PE substrate onto which the photopolymer film, exposed with the hologram, is applied.
  • the photopolymer can, for example, be formed from a one-component monomer selected from benzoyl ether, acetophenone, benzoyl oxime, and acylphosphine.
  • the photopolymer can be based on a two-component system whose components are selected from benzophenone, xanthone, and quinone.
  • a device 100 for the optical verification of at least one component 102 of an identification, security, or other document, in particular for the optical quality control of an exposed hologram film, is shown in a sectional view.
  • the device 100 comprises a detection chamber 108 into which at least one component 102 of the identification, security, or other document can be inserted.
  • the device 100 is formed with a housing that includes a feed slot for feeding the component 102 of the identification, security, or other document into the detection chamber 108.
  • the device 100 also comprises a set of light emitters 104, which in this case are narrowband light-emitting diodes, in particular of known characteristics.
  • the set of light emitters 104 is configured to emit light in the direction of the detection chamber 108 and thus in the direction of the component 102 of the identification, security, or other document.
  • the figure shows three light emitters 104 as purely exemplary examples, although a different number of light emitters 104 is also possible.
  • At least one of the light emitters 104 is configured to emit light from a first wavelength range (e.g., with peak wavelength ⁇ 1 ).
  • At least one of the light emitters 104 is configured to emit light from a second wavelength range that differs from the first (e.g., with peak wavelength ⁇ 2 ).
  • all light emitters 104 present in the device 100 emit light from different wavelength ranges, i.e., light with different peak wavelengths.
  • the device 100 further comprises a photodetector 106 directed towards the detection area 108.
  • the photodetector 106 shown in the figure is designed to detect the light transmitted through the component 102 of the identification, value or security document, which is why the device 100 forms a type of transmission photometer, because the The photodetector 106 is arranged opposite the set of light emitters 104 with respect to the detection area 108.
  • An alternative configuration is possible – but not covered by the invention – in which the photodetector 106 is arranged on the same side as the set of light emitters 104 with respect to the detection area 108, so that the photodetector 106 is configured to detect the light reflected from the component of the identification, security, or other document 100.
  • the device 100 functions as a type of reflection photometer. It is advantageous if the photodetector 106 is aligned in a direction corresponding to the reconstruction angle of the hologram to be tested.
  • the light emitters 104 are embedded in a wall or lid of a housing or chamber 118 such that light emission occurs exclusively within the chamber. It can be seen that each of the light emitters 104 comprises an axis of symmetry 112 or a cone of light from its emission point, which intersects the other axes of symmetry 112 of the other emission points at a common intersection point 114. It should be noted that the optical axes 112 of the light emitters 104 can also be imprecise, so that their cones of light overlap in a plane to form a single illuminated surface. The intersection point 114, or the overlapping light surface, lies close to the surface or within the volume of an optical diffuser 116 positioned upstream of the detection chamber 108.
  • This diffuser causes a diffuse distribution of the light and, together with the intersection point 114, ensures that each light emitter 104 illuminates precisely the same position on the sample.
  • the diffuser 116 acts as a second light source whose light can be used for verification. It emits light towards the detection chamber 108 with a program-controlled wavelength, which is determined by the wavelength of the light emitter 104 illuminating the diffuser 116.
  • An optical tube 120 is also located between the detection chamber 108 and the diffuser 116, which further limits the exit angles into the detection chamber 108.
  • the device 100 after Figure 3 differs from device 100 according to Figure 1 This is achieved simply by inserting an aperture 121 between the tube 120 and the detection chamber 108.
  • the optional aperture 121 allows the captured area of the document and the angle of incidence of the light beam to be controlled. This design is particularly advantageous when checking holographic features, as it allows the direction of incidence of the light to be precisely controlled.
  • All described devices 100 also include a controller 110, preferably a CPU or a microcontroller, which can perform evaluation tasks.
  • the controller 110 is also configured to cause the light emitters 104 to emit light sequentially in the direction of the detection area 108.
  • the angle of intersection of the light beam, formed approximately by beam shaping, with the film should be freely selectable; the drawing only suggests a perpendicular transit by way of example. In holography, a changed angle of incidence can improve the signal quality.
  • the control unit 110 is in a communication link (shown as a dashed line) with each individual light emitter 104.
  • the control unit is also in a communication link (shown as a dashed line) with the photodetector 106.
  • a counterfeit or manufacturing defect exists, for example, if no peak wavelength is detected, or if the "wrong" peak wavelength is detected, or if there is merely an attenuation of the intensity at a "correct” wavelength.
  • the measured value can "drift,” usually by a few nanometers, so this drift or the associated color shift can also be taken into account during testing.
  • the control unit 110 determines the optical transmission caused by component 102 of the identification, security, or other document based on the light detected by the photodetector 106. The optical transmission thus determined is then compared with a predetermined reference value for transmission. Manipulation of component 102 of the identification, security, or other document is detected if the determined optical transmission and the predetermined reference value deviate from each other by a minimum value.
  • a photoamplifier is assigned to the photodetector 106. More efficient data processing can be achieved by designing the photodetector 106 as a photodiode and the photoamplifier as a photodiode amplifier.
  • the inventive method and the inventive device 100 have the advantage that, due to the rapid sequential switching between the light emitters 104, a multitude of different wavelengths are coupled into the detection space 108 simultaneously or "quasi"-simultaneously, whereby the transmission of these wavelengths can then be detected by the photodetector 106 without having to move the sample between the emitters or the emitters above the sample.
  • the desired accuracy can be achieved by Taking into account the influence of the spectral width of the emitter and the spectral sensitivity of the receiver can be further increased.

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  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Inspection Of Paper Currency And Valuable Securities (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)

Claims (12)

  1. Dispositif (100) à la manière d'un photomètre à transmission pour la vérification optique d'au moins un composant (102) d'un document d'identité, de valeur ou de sécurité par une mesure de transmission, avec un espace de détection (108) dans lequel au moins le composant (102) du document d'identité, de valeur ou de sécurité peut être introduit, avec un ensemble d'émetteurs de lumière (104) qui est configuré pour émettre de la lumière en direction du composant (102) du document d'identité, de valeur ou de sécurité, dans lequel au moins un premier émetteur de lumière (104) est configuré pour envoyer de la lumière à partir d'une première gamme de longueurs d'onde, et dans lequel au moins un second émetteur de lumière (104) est configuré pour envoyer de la lumière à partir d'une seconde gamme de longueurs d'onde différente de la première gamme de longueurs d'onde,
    ainsi qu'un photodétecteur (106) dirigé vers l'espace de détection (108), photodétecteur qui est conçu pour détecter de la lumière transmise à travers le composant (102) du document d'identité, de valeur ou de sécurité, dans lequel chacun des émetteurs de lumière (104) comprend un axe de symétrie (112) de sa sortie de lumière qui croise les axes de symétrie (112) restants des autres sorties de lumière en un point d'intersection commun (114), caractérisé en ce que le point d'intersection commun (114) est situé en amont de l'espace de détection (108), de sorte que les rayons lumineux se rencontrent au point d'intersection commun avant même d'entrer dans l'espace de détection.
  2. Dispositif (100) selon la revendication 1, caractérisé en ce que le point d'intersection (114) se situe à la surface ou dans le volume d'un diffuseur optique (116) en amont de l'espace de détection (108).
  3. Dispositif (100) selon la revendication 1 ou 2, caractérisé en ce qu'un tube optique (120) se présente en amont de l'espace de détection (108) dans le trajet de faisceau de l'émetteur de lumière (120).
  4. Dispositif (100) selon l'une quelconque des revendications 1 à 3, caractérisé en ce qu'un amplificateur photo est associé au photodétecteur (106).
  5. Dispositif (100) selon la revendication 4, caractérisé en ce que le photodétecteur (106) se présente sous la forme d'une photodiode et en ce que l'amplificateur photo se présente sous la forme d'un amplificateur de photodiode.
  6. Dispositif selon l'une quelconque des revendications 1 à 5, caractérisé en ce que l'ensemble d'émetteurs de lumière (104) est inséré dans une paroi d'une chambre (118), de sorte que la lumière soit émise à l'intérieur de la chambre (118).
  7. Dispositif (100) selon l'une quelconque des revendications 1 à 6, comprenant un dispositif de commande (110) qui est configuré pour :
    - déterminer une transmission optique provoquée par le composant (102) du document d'identité, de valeur ou de sécurité à l'aide de la lumière détectée par le photodétecteur (106),
    - comparer la transmission optique déterminée à une valeur de comparaison prédéfinie pour la transmission, et
    - déterminer une manipulation ou au moins une erreur du composant (102) du document d'identité, de valeur ou de sécurité lorsque la transmission optique déterminée et la valeur de comparaison prédéfinie divergent l'une de l'autre selon une valeur minimale.
  8. Dispositif (100) selon la revendication 7, caractérisé en ce que le dispositif de commande(110) est configuré pour amener les émetteurs de lumière (104) d'émettre de la lumière séquentiellement en direction de l'espace de détection (108).
  9. Procédé de vérification optique d'au moins un composant (102) d'un document d'identité, de valeur ou de sécurité au moyen d'une mesure de transmission avec un dispositif selon l'une quelconque des revendications 1 à 8, comprenant les étapes consistant à:
    - positionner le composant (102) du document d'identité, de valeur ou de sécurité par rapport à un ensemble d'émetteurs de lumière (104) et à un photodétecteur (106) dans un espace de détection (108), de sorte que de la lumière émise par les émetteurs de lumière (104) heurte le composant (102) du document d'identité, de valeur ou de sécurité et que de la lumière sortant du composant (102) du document d'identité, de valeur ou de sécurité soit détectée par le photodétecteur (106) ;
    - envoyer de la lumière à partir d'une première gamme de longueurs d'onde au moyen d'un premier émetteur de lumière (104) et recevoir de la lumière sortant du composant (102) au moyen du photodétecteur (106),
    - envoyer de la lumière à partir d'une seconde gamme de longueurs d'onde différente de la première gamme de longueurs d'onde au moyen d'un second émetteur de lumière (104) et recevoir de la lumière sortant du composant (102) au moyen du photodétecteur (106),
    - déterminer une transmission optique provoquée par le composant (102) du document d'identité, de valeur ou de sécurité à l'aide de la lumière respectivement détectée par le photodétecteur (106),
    - comparer la transmission optique déterminée à une valeur de comparaison prédéfinie pour la transmission, et
    - constater une manipulation ou au moins un défaut du composant (102) du document d'identité, de valeur ou de sécurité lorsque la transmission optique déterminée dans au moins une des deux gammes de longueurs d'onde émises diverge de la valeur de comparaison prédéfinie selon une valeur minimale,
    dans lequel chacun des émetteurs de lumière (104) comprend un axe de symétrie (112) de sa sortie de lumière qui croise les axes de symétrie (112) restants des autres sorties de lumière en un point d'intersection commun (114), caractérisé en ce que les rayons lumineux se rencontrent au point d'intersection commun (114) avant d'entrer dans l'espace de détection (108).
  10. Procédé selon la revendication 9, caractérisé en ce que le point d'intersection (114) se situe à la surface ou dans le volume d'un diffuseur optique (116) en amont de l'espace de détection (108).
  11. Procédé selon la revendication 9 ou 10, caractérisé en ce que l'ensemble d'émetteurs de lumière (104) est inséré dans une paroi d'une chambre (118) et en ce que la lumière est émise à l'intérieur de la chambre (118).
  12. Procédé selon l'une quelconque des revendications 9 à 11, caractérisé en ce que les émetteurs de lumière (104) émettent de la lumière séquentiellement en direction de l'espace de détection (108).
EP22170185.7A 2021-04-30 2022-04-27 Procédé et dispositif de vérification optique d'un composant d'un document identification de valeur ou de sécurité Active EP4086864B1 (fr)

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DE102021111189.7A DE102021111189A1 (de) 2021-04-30 2021-04-30 Verfahren und Vorrichtung zur optischen Verifikation eines Bestandteils eines Ausweis-, Wert- oder Sicherheitsdokuments

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EP4086864B1 true EP4086864B1 (fr) 2025-11-12

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GB0025096D0 (en) * 2000-10-13 2000-11-29 Bank Of England Detection of printing and coating media
DE10160578A1 (de) 2001-12-10 2004-02-12 Giesecke & Devrient Gmbh Verfahren und Vorrichtung für die Überprüfung der Echtheit von Blattgut
US8749767B2 (en) * 2009-09-02 2014-06-10 De La Rue North America Inc. Systems and methods for detecting tape on a document

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Publication number Priority date Publication date Assignee Title
GB2355522A (en) * 1999-10-19 2001-04-25 Innovative Technology Ltd Improvements in verifying printed security substrates
US20100128964A1 (en) * 2008-11-25 2010-05-27 Ronald Bruce Blair Sequenced Illumination

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