EP3746992B1 - Procédé pour le contrôle de l'authenticité et/ou de l'intégrité d'un document de sécurité comprenant une caractéristique de sécurité imprimée, caractéristique de sécurité et dispositif pour la vérification - Google Patents

Procédé pour le contrôle de l'authenticité et/ou de l'intégrité d'un document de sécurité comprenant une caractéristique de sécurité imprimée, caractéristique de sécurité et dispositif pour la vérification Download PDF

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Publication number
EP3746992B1
EP3746992B1 EP19702192.6A EP19702192A EP3746992B1 EP 3746992 B1 EP3746992 B1 EP 3746992B1 EP 19702192 A EP19702192 A EP 19702192A EP 3746992 B1 EP3746992 B1 EP 3746992B1
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EP
European Patent Office
Prior art keywords
security feature
security
printing substance
visually
radiation
Prior art date
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EP19702192.6A
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German (de)
English (en)
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EP3746992A1 (fr
Inventor
Jörg Fischer
Manfred Paeschke
Frank Fritze
Lazar KULIKOVSKY
Matthias Hiller
Julian Horsch
Sascha Wessel
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Bundesdruckerei GmbH
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Bundesdruckerei 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
    • 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
    • G07D7/003—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 security elements

Definitions

  • the present invention relates to a method for checking the authenticity and/or integrity of a security document with a printed security feature. Furthermore, the invention relates to the printed security feature for the security document and an arrangement for verifying the security document with the security feature.
  • the device comprises a light generating device, an image recording device and a processor.
  • WO 2012/083469 A1 describes a method and a device for the authentication of documents marked with photochromic systems.
  • the method for checking the authenticity of a security feature provides that a first and a second image of the security feature are recorded.
  • the appearance of the security feature changes in the visible range when stimulated by a flash of light.
  • the first picture is taken without, the second picture with using a mobile phone flash function.
  • an authentication check can be carried out by the cell phone with the aid of a suitable data processing program.
  • An identification feature with a plurality of identification elements is arranged on or on the object.
  • a first identification feature becomes visually recognizable by irradiating the identification elements with light in a wavelength range of 380 nm to 790 nm.
  • Articles are marked with a unique sequence consisting of patterns for authentication using an article marking method.
  • the patterns can be photoluminescence patterns, for example.
  • FIG. 1 shows a security element comprising a first pattern of discrete elements of a first material and a second pattern of discrete elements of a second material.
  • a third pattern generated from the superimposition of the first pattern with the second pattern can be detected by an image acquisition unit, the first and/or the second pattern being excited to luminescence.
  • the third pattern showing an image is compared to a reference image.
  • security features are used in a wide variety of applications. Only a few of these are suitable as security features for security documents, for example banknotes, certificates, ID cards, identification cards and the like. In this subset of security features Few designs to date are suitable for trustworthy and difficult to manipulate verification with widely available simple devices and devices. For example, complex emission properties can be integrated into printable phosphors, but their authenticity can only be examined with expensive and complicated test devices, which can only be found in a few places, e.g. B. be held in central banks. In particular, there is a lack of simple arrangements that are available to virtually every end user for checking security features and thus allowing the integrity and authenticity of security documents to be checked.
  • one object of the present invention is to provide a method which enables the verification of a security document with a printed security feature.
  • a further object is to provide a security feature which can be printed on a security document or is produced using known printing methods during the production of the security document and subsequently allows verification of the security document. Verification should also be possible on the go, for example with a smartphone, using widely available devices.
  • the security feature should be able to be applied to a large number of security documents or objects.
  • a further object of the present invention is to provide an arrangement for verifying the security document with this security feature.
  • the object is achieved by a method for verification or for authenticity and/or integrity testing for a security document with a security feature according to appended claim 1 and by a printed security feature and an arrangement for verifying the security document with a security feature according to the appended independent claims 7 and 11.
  • the method according to the invention is used for authenticity and/or integrity testing or verification testing of a security document with a security feature according to claim 1 printed on it.
  • the term “printed substance” is to be understood broadly, in the sense of a material with or in which information can be reproduced. In the simplest case, it is a printing ink with pigments and/or phosphors.
  • the term “visually non-visible” or “visually imperceptible” means that the corresponding information or radiation or pattern cannot be detected by the user's naked eye.
  • the security feature applied to the security document is irradiated with electromagnetic radiation of a predetermined wavelength using an illumination unit of the mobile terminal device.
  • the security feature in particular the first printing substance, is excited to luminescence by the irradiation.
  • the first printing substance is configured in such a way that, when excited with an excitation radiation such as that emitted by the lighting unit, it shows an invisible emission in a wavelength range that can be detected by an image acquisition unit of the mobile terminal device and preferably can also be displayed in a display unit of the mobile terminal device.
  • emission values of the security feature are recorded using the image recording unit of the mobile terminal device.
  • a number of individual images of the security feature that is excited are generated at time-defined intervals.
  • the individual images contain the visually non-visible radiation of the first printing substance and an image of the pattern formed by the second printing substance.
  • the individual images can be stored in a memory or, after appropriate processing (visualization of the invisible pattern), displayed on the display unit.
  • the captured individual images are evaluated using a data processing unit and used to check the authenticity and/or integrity used.
  • the individual images are compared with stored reference images or the recorded emission values with stored reference values.
  • the reference images are selected according to the time-defined recording intervals of the individual images.
  • the reference images can in particular be formed by the patterns imaged with the second printing substance.
  • the result of the verification is output.
  • a positive result of the authenticity and/or integrity check is output if the captured individual images match the reference images stored in the data processing unit or if the emission values match the reference values.
  • the captured individual images are checked with the stored reference images at defined positions of the images. For example, three points are selected at specific positions in the image area of a single image and the corresponding pixels at the specific positions of the reference image are compared with these.
  • the images, especially their positions, defined and determined point positions and the measured luminescence as well as the luminescence stored as a reference are compared.
  • the reference values are preferably stored in a digital memory, which can be part of the mobile terminal device, or in an intelligent database on a remote server.
  • the individual images of the excited security feature on the security document are recorded at intervals of less than 100 milliseconds (ms).
  • the individual images of the security feature excited on the security document are preferably recorded at time intervals of microseconds (ps).
  • the decay times of the emission of the first printing substance and the time intervals between the individual images are suitably chosen in order to be able to record the emission in the individual images.
  • the captured individual images are checked against the reference images by the data processing unit using a data processing program.
  • the data processing program preferably includes an algorithm for executing the steps of the method according to the invention.
  • the algorithm is preferably designed to evaluate cryptographic data or other non-cognitively detectable data that is encoded, for example, as the non-visible or the visible pattern.
  • the data processing unit is preferably part of the mobile terminal device.
  • the image acquisition unit is preferably a photo sensor or an image sensor.
  • the image acquisition unit particularly preferably comprises a plurality of photo sensors, in particular one Camera, which is also sensitive to non-visible radiation and converts this into electrical image signals.
  • the lighting unit for irradiating the security document is preferably one or more LEDs that generate white light.
  • the white light can be implemented as part of a flashlight function of the mobile device.
  • the light generated contains radiation in the frequency range that is required for the excitation of the first printing substance so that it is excited to emit non-visible emissions.
  • the visually non-visible and the visually visible pattern of the first and the second printing substance are preferably arranged in one and the same area on the security document.
  • the non-visible pattern can be attached directly to a portrait of a person in a passport. Checking the non-visible pattern would then immediately reveal tampering if the portrait was altered or exchanged, as this inevitably leads to damage to the non-visible pattern.
  • the security document is preferably checked online using the mobile terminal device, which transmits data to a server and receives it from it.
  • the security document is preferably checked offline using the mobile terminal device, d. H. the complete verification is carried out by the mobile device and the result is displayed by it.
  • the method can be used to verify the security feature with defined patterns and materials.
  • One advantage of the method according to the invention is that the security document can be checked on the move using any mobile terminal device that is equipped with a flashlight function with a white LED or LED emitting white light and the corresponding data processing unit.
  • This makes it possible, in particular, to check the security features integrated there by taking pictures of physical security documents using a conventional mobile device (smartphone, tablet, wearables), which has been configured by software (app) for the application, and to use the result of the check directly in digital applications.
  • a conventional mobile device smarttphone, tablet, wearables
  • the application has been configured by software (app) for the application
  • the result of the check directly in digital applications For example, the authenticity of a person can be confirmed within an online purchase process by photographing an ID card and simultaneously verifying the authenticity of this ID card.
  • the method is also advantageous because it can be used both online and offline. Another benefit is that verification is quick and easy.
  • the security document can also be checked using other data processing systems with image acquisition units, e.g. As desktop monitors, service terminals or the like.
  • the printed security feature according to the invention can be applied to a security document, in particular can be printed during the production of the security document.
  • the security feature consists of a visually invisible pattern and a visually visible pattern.
  • the visually invisible pattern is formed by a first printing substance.
  • the first printing substance can be excited to luminescence by electromagnetic radiation of a predetermined wavelength, so that the first printing substance has a emits non-visible radiation that is not visible to the human eye, but can nevertheless be captured by an image acquisition unit of a mobile device and converted into electrical image signals.
  • the visually visible pattern is formed by a second printing substance.
  • the first printing substance is selected so that when it is stimulated by electromagnetic radiation, in particular illuminated by the flashlight of the mobile device, invisible radiation is emitted from the first printing substance, which can be detected or read by the image acquisition unit of the mobile terminal.
  • the printed security feature which can be applied to a security document, serves to verify the security document, with the authenticity and/or integrity being checked. Authenticity is the authenticity and integrity of an object.
  • the security document with a printed security feature can be checked using the method described above. What has been described above applies to all embodiments. The details of the security feature according to the invention described below can also be used for the method described above.
  • the second printing substance can also be excited to luminescence, in which case the two printing substances particularly preferably have two different emission spectra and/or decay times.
  • the decay times are preferably in the millisecond range.
  • the printing substances are selected in such a way that the decay times are in the range of the serial or single image recording times of the mobile terminal device.
  • the decay times are chosen so that after excitation of the first particle with the flash light conventional smartphones at least two consecutive images can be taken by the camera of the smartphone, in which sufficiently strong emissions of the first particles can be recorded.
  • the printing substances mentioned can each be composed of several different particle subtypes.
  • the visually non-visible pattern is in the form of a machine-readable code.
  • the visually visible pattern is in the form of a machine-readable code (binary data).
  • the visually non-visible pattern and the visually visible pattern are particularly preferably designed as a machine-readable code.
  • the machine-readable code is particularly preferably a cryptographic code which, for example, has the form of a barcode, QR code or the like.
  • the security feature preferably consists of the visually non-visible pattern and the visually visible pattern, which together form a further pattern which can preferably be displayed by the display unit of the mobile device.
  • the user of the mobile device can, for example, have both patterns displayed in one image on the display unit, so that the composite further pattern becomes recognizable.
  • the security feature can preferably be applied to a security document to be checked or to a comparable object (eg label) to be checked.
  • the security feature can preferably be introduced on a security document to be checked or in an object to be checked.
  • the security feature can be read, for example, by a smartphone.
  • Security processes can preferably be processed by evaluating the security feature, in particular its pattern or code.
  • An object, a process or a user can be identified on the basis of the pattern or code.
  • Information or encrypted secrets e.g. data keys
  • This process can be used to further verify integrity.
  • decrypted information is compared with data from the security document.
  • a name or ID number can be stored again as a QR code, so that an "offline check" can also be carried out without access to a remote server.
  • the decrypted information can also be compared with data in an external database ("online check").
  • the security feature can be used for multi-factor authentication. For example, it can be applied to a photo of a passport, with the photo, the decay time of the first printed substance after luminescence excitation of the security feature and the pattern formed by the security feature being checked.
  • Another advantage of the security feature is that items on which it is printed can be assigned to a common group or distinguished from one another. Furthermore, the authenticity or authenticity can be checked. It is also advantageous that information, for example serial numbers, can be transmitted through the applied pattern.
  • the arrangement according to the invention serves to check the authenticity and/or integrity or the verification check of a security document.
  • the arrangement includes a security feature and a mobile terminal.
  • the security feature is printed on the security document.
  • the security feature corresponds to the security feature described above with all embodiments.
  • the mobile terminal includes a lighting unit and an image capturing unit.
  • the lighting unit is designed to emit electromagnetic radiation.
  • the image capturing unit is used to capture radiation, in particular non-visible radiation, which is emitted by a non-visible pattern of the security feature after excitation has taken place.
  • the image acquisition unit is used for radiation detection of a visually visible pattern.
  • the non-visible pattern is formed by a first printing substance that can be excited to luminescence by means of electromagnetic radiation.
  • the visually visible pattern is formed by a second printing substance.
  • the security document on which the security feature is applied can be, for example, a bank note, a token, a passport or an identity card. Further uses of the security feature on e.g. B. the following items are possible: value and security documents, stamps, banknotes, ID cards, vehicle registration documents, bank cards, concert tickets, Train tickets, food packaging, clothing, spare parts, labels or medicine packaging.
  • value and security documents stamps, banknotes, ID cards, vehicle registration documents, bank cards, concert tickets, Train tickets, food packaging, clothing, spare parts, labels or medicine packaging.
  • the security feature can also be used to identify and assign objects, for example in warehouses, or to protect products.
  • One of the following devices can be used to apply the printable security feature, with a defined pattern preferably being applied: printing machine, stamp or spray device.
  • the lighting unit is preferably an LED.
  • the lighting unit is particularly preferably an LED for generating white light, known as a white LED, which is regularly integrated in mobile terminals.
  • White LEDs are known to use a blue LED in combination with a conversion phosphor.
  • the mobile terminal is preferably a smartphone.
  • the mobile end device is preferably a tablet PC with a camera.
  • the mobile terminal can be a smartwatch.
  • the mobile terminal is part of a smart home system.
  • the lighting unit is preferably a camera of the mobile terminal device with a flash light function.
  • the flashlight function has the usual lighting times.
  • the image capture unit is preferably a camera of the mobile terminal device for capturing individual or serial images or videos.
  • the image capture unit has the default capture time and capture intervals.
  • the single FIGURE shows a method step of the method according to the invention for checking the authenticity and/or integrity of a security document 01 with a printed security feature 02.
  • the security document 01 is an identification document with a feature 03, such as bibliographic data or a photo of the ID card owner.
  • the security feature 02 has a code or a pattern 04 .
  • the pattern 04 consists of a first printing substance (not shown) and a second printing substance (not shown).
  • the pattern 04 is arranged on the feature, for example the photo, so that multi-factor authentication can take place.
  • the first printing substance can be excited to luminesce by electromagnetic radiation of a predetermined wavelength and forms a visually invisible pattern.
  • the second printing substance forms a visually visible pattern.
  • the security feature 02 is excited to luminescence by means of a smartphone 06 by activating the flash light function of a camera (not shown) and emitting electromagnetic radiation.
  • the flashlight function emits electromagnetic radiation 07.

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  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • General Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Inspection Of Paper Currency And Valuable Securities (AREA)
  • Credit Cards Or The Like (AREA)
  • Printing Methods (AREA)

Claims (13)

  1. Procédé, destiné à contrôler l'authenticité et / ou l'intégrité d'un document de sécurité à l'aide d'une caractéristique de sécurité imprimée, la caractéristique de sécurité comportant une première substance d'impression, laquelle est apte à être stimulée à la luminescence et émet à cet effet, à la fin de la stimulation, dans une période de déclin, un rayonnement non perceptible visuellement, qui est susceptible d'être détecté au moyen d'une unité de détection d'images d'un terminal, et la caractéristique de sécurité comportant une deuxième substance d'impression, comprenant les étapes suivantes, consistant à :
    - irradier la caractéristique de sécurité appliquée sur le document de sécurité avec un rayonnement électromagnétique d'une longueur d'onde prédéfinie, au moyen d'une unité d'éclairage du terminal ;
    - enregistrer plusieurs images individuelles de la caractéristique de sécurité stimulée dans des intervalles définis dans le temps, au moyen de l'unité de détection d'images du terminal, les images individuelles reproduisant le rayonnement non perceptible visuellement de la première substance d'impression et une image de la deuxième substance d'impression et les images individuelles étant détectées à des intervalles inférieurs à 100 millisecondes ;
    - contrôler les images individuelles détectées ou des données qui en sont dérivées au moyen d'une unité de traitement de données, les images individuelles ou les données dérivées étant comparées avec des données de référence sauvegardées, selon les intervalles d'enregistrement définis dans le temps ; et
    - éditer un résultat du contrôle d'authenticité et / ou d'intégrité des images individuelles détectées avec les images de référence.
  2. Procédé selon la revendication 1, caractérisé en ce que le contrôle des images individuelles détectées avec des images de référence s'effectue dans des positions définies des images.
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce qu'à partir des images individuelles enregistrées de la caractéristique de sécurité stimulée, des valeurs d'émission sont déterminées par le terminal, notamment un spectre d'émission et / ou des intensités de rayonnement à des instants précis dans la période de déclin.
  4. Procédé selon l'une quelconque des revendications 1 à 3, caractérisé en ce que les images individuelles sont sauvegardées dans une mémoire ou après un traitement d'images automatique, elles sont affichées sur une unité d'affichage.
  5. Procédé selon l'une quelconque des revendications 1 à 4, caractérisé en ce que l'unité de traitement de données est un élément d'un terminal mobile, et en ce que l'unité de détection d'images est un photodétecteur, un capteur d'images ou une caméra.
  6. Procédé selon l'une quelconque des revendications 1 à 5, caractérisé en ce que la première substance d'impression est imprimée sous la forme d'un motif non visible et la deuxième substance d'impression est imprimée sous la forme d'un motif visible dans une zone commune sur le document de sécurité.
  7. Caractéristique de sécurité pour un document de sécurité, un motif non apparent visuellement étant constitué d'une première substance d'impression, susceptible d'être stimulée à la luminescence par un rayonnement électroluminescent d'une longueur d'onde prédéfinie et un motif visuellement apparent étant constitué par une deuxième substance d'impression ; et, lors de la stimulation par le rayonnement électromagnétique, la première substance d'impression susceptible d'être stimulée à la luminescence émettant à la fin de la stimulation, dans une période de déclin un rayonnement non perceptible visuellement, qui est susceptible d'être détecté par une unité de détection d'images d'un terminal, l'émission temporelle de la première substance d'impression étant sélectionnée de telle sorte qu'elle soit susceptible d'être détectée dans des images individuelles, les images individuelles étant détectées à des intervalles inférieurs à 100 millisecondes.
  8. Caractéristique de sécurité selon la revendication 7, caractérisée en ce qu'également la deuxième substance d'impression est susceptible d'être stimulée à la luminescence et la première et la deuxième substances d'impression font preuve de différentes périodes de déclin et / ou émettent dans des domaines spectraux différents.
  9. Caractéristique de sécurité selon la revendication 7 ou 8, caractérisée en ce que le motif non apparent visuellement et / ou le motif apparent visuellement sont conçus sous la forme d'un code lisible par machine, notamment d'un code non détectable de manière cognitive.
  10. Caractéristique de sécurité selon l'une quelconque des revendications 7 à 9, caractérisée en ce que la caractéristique de sécurité est susceptible d'être appliquée sur le document de sécurité qui doit être contrôlé ou d'être introduite dans celui-ci.
  11. Ensemble, destiné à contrôler l'authenticité et / ou l'intégrité d'un document de sécurité, comprenant :
    - une caractéristique de sécurité selon l'une quelconque des revendications 7 à 10, laquelle est appliquée sur le document de sécurité ; et
    - un terminal mobile, pourvu d'une unité d'éclairage, laquelle est conçue pour émettre un rayonnement électromagnétique ; pourvu d'une unité de détection d'images, qui sert à détecter un rayonnement non perceptible visuellement d'un motif visuellement non apparent et d'un motif visuellement apparent, le motif non visible étant constitué d'une première substance d'impression, susceptible d'être stimulée à la luminescence au moyen d'un rayonnement électromagnétique, et le motif visuellement apparent étant constitué d'une deuxième substance d'impression, l'unité de détection d'images étant conçue pour détecter le rayonnement dans des intervalles de temps inférieurs à une seconde ; et pourvu d'une unité de traitement de données, destinée à contrôler l'authenticité et / ou l'intégrité du document de sécurité à l'aide du rayonnement détecté par l'unité de détection d'images.
  12. Ensemble selon la revendication 11, caractérisé en ce que le terminal mobile est un smartphone, une tablette ou un élément d'un système domestique intelligent.
  13. Ensemble selon la revendication 11 ou 12, caractérisé en ce que la caractéristique de sécurité est appliquée sur le document de sécurité au moyen d'une imprimante, d'un poinçon ou d'un dispositif de pulvérisation.
EP19702192.6A 2018-01-30 2019-01-16 Procédé pour le contrôle de l'authenticité et/ou de l'intégrité d'un document de sécurité comprenant une caractéristique de sécurité imprimée, caractéristique de sécurité et dispositif pour la vérification Active EP3746992B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102018102015.5A DE102018102015A1 (de) 2018-01-30 2018-01-30 Verfahren zur Verifikationsprüfung eines Sicherheitsdokuments mit einem gedruckten Sicherheitsmerkmal, Sicherheitsmerkmal und Anordnung zur Verifikation
PCT/EP2019/051023 WO2019149525A1 (fr) 2018-01-30 2019-01-16 Procédé pour le contrôle de l'authenticité et/ou de l'intégrité d'un document de sécurité comprenant une caractéristique de sécurité imprimée, caractéristique de sécurité et dispositif pour la vérification

Publications (2)

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EP3746992A1 EP3746992A1 (fr) 2020-12-09
EP3746992B1 true EP3746992B1 (fr) 2023-07-26

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EP (1) EP3746992B1 (fr)
CN (1) CN111699517A (fr)
DE (1) DE102018102015A1 (fr)
WO (1) WO2019149525A1 (fr)

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DE102019210761A1 (de) * 2019-07-19 2021-01-21 Bundesdruckerei Gmbh Photolumineszenz-Sensorvorrichtung zum Verifizieren eines Sicherheitsmerkmals eines Objekts und Verfahren zum Kalibrieren einer Photolumineszenz-Sensorvorrichtung
DE102019121798A1 (de) * 2019-08-13 2021-02-18 Bundesdruckerei Gmbh Mobiles Bildverarbeitungsgerät zum Erfassen einer Abbildung eines Dokumentes
DE102020104115A1 (de) * 2020-02-17 2021-08-19 Bundesdruckerei Gmbh Verfahren zum Überprüfen eines smartphone-verifizierbaren Sicherheitsmerkmals, Smartphone-verifizierbares Sicherheitsmerkmal und Wert- oder Sicherheitsdokument
DE102020120567B4 (de) 2020-08-04 2022-07-14 Bundesdruckerei Gmbh Verfahren zur echtheitsverifikation eines leuchtstoffbasierten sicherheitsmerkmals unter verwendung eines mobilen endgeräts sowie mobiles endgerät
DE102020131382A1 (de) 2020-11-26 2022-06-02 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung eingetragener Verein Methode zur Kennzeichnung von Produkten mit optischem Sicherheitsmerkmal mit zeitlicher Dimension
JP2022110367A (ja) * 2021-01-18 2022-07-29 株式会社リコー 不正確認補助装置および不正確認方法
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EP3746992A1 (fr) 2020-12-09
WO2019149525A1 (fr) 2019-08-08
CN111699517A (zh) 2020-09-22

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