EP3416141B1 - Method for authenticating a document having a transparent window, method for conducting transactions and device for implementing same - Google Patents

Method for authenticating a document having a transparent window, method for conducting transactions and device for implementing same Download PDF

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Publication number
EP3416141B1
EP3416141B1 EP18175401.1A EP18175401A EP3416141B1 EP 3416141 B1 EP3416141 B1 EP 3416141B1 EP 18175401 A EP18175401 A EP 18175401A EP 3416141 B1 EP3416141 B1 EP 3416141B1
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EP
European Patent Office
Prior art keywords
document
image
background
window
capture
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.)
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Application number
EP18175401.1A
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German (de)
French (fr)
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EP3416141A1 (en
EP3416141C0 (en
Inventor
Jérémy DURA
Benjamin GRAVELLIER
Laurent ROSTAING
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Idemia Identity and Security France SAS
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Idemia Identity and Security France SAS
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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
    • G07D7/20—Testing patterns thereon
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
    • G07D7/00—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency
    • 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
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
    • G07D7/00—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency
    • G07D7/181—Testing mechanical properties or condition, e.g. wear or tear
    • G07D7/185—Detecting holes or pores
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/351—Translucent or partly translucent parts, e.g. windows

Definitions

  • the present invention relates to the authentication of documents such as gaming or betting receipts (lottery for example), identity documents, etc. and the carrying out of transactions after such authentication.
  • a current trend is aimed at the development of transactions, particularly financial, carried out remotely and more particularly via the Internet and/or mobile telephone networks (of the GSM type for example). Completing these transactions often requires transmitting an image of at least one official document such as an identity document.
  • the image is captured using the optical sensor, for example of a telecommunications terminal such as a “smartphone” type telephone, then coded to be transmitted via the network to a server programmed to at least initiate the service.
  • An aim of the invention is to provide a means enabling the security of transactions to be improved. using an image of a document.
  • the method of the invention allows relatively reliable authentication of the document. Indeed, in the case of a simple photocopy of the document, the background does not appear in the window or is fixed (case of a background printed in the window) and, in the case of a photocopy of the document in which a window has been cut out, the mark does not appear.
  • the subject of the invention is a device arranged to implement these processes.
  • the device is for example a mobile telephone equipped with a camera and a processor adapted to the image processing to be carried out or a fixed document reading device.
  • the document to be authenticated is referenced D and is provided with a window O in which extends a transparent film F provided with a mark M here a series of alphanumeric characters.
  • the transparent film is here a strip extending across the window O but the transparent film F can occupy all or part of the window O.
  • the mark M can also include a geometric pattern or be made up of one or more geometric patterns associated or not with a series of alphanumeric characters.
  • document D can be any document and for example a lottery ticket.
  • Server 1 is a classic type computer.
  • the terminal is a mobile telephone 100 comprising an image sensor 110 connected to a processing unit 120.
  • the mobile telephone 100 is a classic "smartphone" type telephone, of which only the programming is special, and which can connect via a GSM type cellular network to network 50.
  • Server 1 is thus programmed to ask the mobile phone to initiate the transaction.
  • Server 1 can also impose the type of document D which will be used for authentication.
  • the dynamic background is random and obtained by moving the document D in front of its environment between a first position and a second position.
  • a first image and a second image of the document D are successively captured by the image sensor 110 controlled by the processing unit 120.
  • the first image is captured when the document D is in its first position and the second image is captured when document D is in its second position.
  • the images can be captured while the document D is moving if the acquisition speed of the sensor is sufficiently high, or the images can be captured when the document is stationary.
  • the capture positions are defined randomly, for example by asking the user to move the document while holding the phone facing it, to trigger a first capture at a time t thus defining a first position and to trigger a second capture after a predetermined or random time thus defining the second position.
  • the time t is either predetermined or determined randomly after the start of the movement.
  • the location of the window O in the image of the document D is carried out by locating the edges of the document D then by deducing the position of window O in the image relative to the edges of document D.
  • Authentication is carried out by checking that the background visible in window O on the image corresponds to an expected background and by checking that the mark M is visible in window O.
  • the expected background in the second image is a background different from that visible in the first image: this expected background is therefore not a predetermined background, we just expect the background in the second image is different from that visible in the first image.
  • This double verification is either carried out by the processing unit 120, the processing unit 120 transferring one of the images to server 1 after authentication, or by the server 1, the processing unit 120 transferring both to server 1 captured images.
  • the cavity 255 is arranged to receive the document D and the display 230 is here horizontal to serve as a support for the document D during image capture.
  • the processing unit 220 of the device 200 is connected either directly to the network 50, or to a computer connected to the network 50. When the device 200 is connected to a computer, it constitutes a peripheral of this computer.
  • the display 230 is arranged to present or broadcast an animated sequence behind window O of document D.
  • the animated sequence constitutes a dynamic background.
  • the animated sequence can be a video sequence or more simply a combination of basic lighting effects depending on the complexity of the display 230.
  • the animated sequence is predetermined here, that is to say that at any moment of the projection we know what is displayed, and the projection of the animated sequence and the image capture are synchronized in such a way that the expected background is determinable depending on the time of capture.
  • the device 200 includes a lighting device 240 to illuminate the document D during image capture.
  • the processing unit 220 controls the lighting device 240 to modify a lighting wavelength between two image captures.
  • the wavelength selection is random.
  • the background which may be static or dynamic, is arranged to have a different response to the lighting wavelengths used for image capture.
  • the expected background depends both on the moment of capture but also on the choice of wavelength making fraud even more difficult.
  • document D also has a different appearance depending on the wavelength used for lighting, it is interesting to capture several images at different wavelengths and to compare the images obtained with expected aspects of document D at these wavelengths. This further complicates fraud.
  • the processing unit may control a background presentation device behind the document.
  • the dynamic background is the result of controlling the presentation device using control parameters selected from a background library. The selection is random.
  • the display can be replaced by a non-opaque background comprising a light source of changing wavelength in different spectral bands.
  • the device may include several image sensors in different spectral bands.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Editing Of Facsimile Originals (AREA)
  • Character Input (AREA)
  • Facsimile Scanning Arrangements (AREA)
  • Image Input (AREA)

Description

La présente invention concerne l'authentification de documents tels que des reçus de jeux ou de paris (loterie par exemple), des documents d'identité... et la réalisation de transactions après une telle authentification.The present invention relates to the authentication of documents such as gaming or betting receipts (lottery for example), identity documents, etc. and the carrying out of transactions after such authentication.

ETAT DE LA TECHNIQUESTATE OF THE ART

Il existe des documents dont il est nécessaire de rendre la falsification difficile. Ces documents comprennent les documents d'identité et les reçus de pari. Ces documents incorporent généralement des moyens de sécurisation qui peuvent comprendre un papier particulier, des filigranes, des motifs sécuritaires complexes, des hologrammes, des parties en matériau brillant ou dont l'aspect est modifié selon la direction de la lumière... La demande de brevet DE 10 2011 084 818 A1 décrit par exemple un procédé d'authentification d'un tel document pourvu d'une fenêtre transparente et présenté devant un arrière-plan pour vérification de l'interaction entre fenêtre et arrière-plan.There are documents that need to be made difficult to falsify. These documents include identity documents and betting receipts. These documents generally incorporate security means which may include a particular paper, watermarks, complex security patterns, holograms, parts made of shiny material or whose appearance is modified depending on the direction of the light... The request for patent DE 10 2011 084 818 A1 describes for example a method of authenticating such a document provided with a transparent window and presented in front of a background for verification of the interaction between window and background.

Par ailleurs, une tendance actuelle vise le développement des transactions, notamment financières, réalisées à distance et plus particulièrement via le réseau Internet et/ou les réseaux de téléphonie mobile (de type GSM par exemple). L'accomplissement de ces transactions nécessite souvent la transmission d'une image d'au moins un document officiel comme un document d'identité. L'image est capturée en utilisant le capteur optique par exemple d'un terminal de télécommunication comme un téléphone de type « smartphone » puis codée pour être transmise via le réseau à un serveur programmé pour au moins initier la prestation.Furthermore, a current trend is aimed at the development of transactions, particularly financial, carried out remotely and more particularly via the Internet and/or mobile telephone networks (of the GSM type for example). Completing these transactions often requires transmitting an image of at least one official document such as an identity document. The image is captured using the optical sensor, for example of a telecommunications terminal such as a “smartphone” type telephone, then coded to be transmitted via the network to a server programmed to at least initiate the service.

Or, les progrès réalisés dans le domaine de la reproduction des documents et la démocratisation des imprimantes et des dispositifs de numérisation (scanners) de bonne voire très bonne qualité facilitent la falsification de ces documents et rendent difficile la détection de cette falsification à partir d'une image du document.However, the progress made in the field of document reproduction and the democratization of printers and scanning devices (scanners) of good or even very good quality facilitate the falsification of these documents and make it difficult to detect this falsification from an image of the document.

OBJET DE L'INVENTIONOBJECT OF THE INVENTION

Un but de l'invention est de fournir un moyen permettant d'améliorer la sécurité de transactions utilisant une image d'un document.An aim of the invention is to provide a means enabling the security of transactions to be improved. using an image of a document.

BREF EXPOSE DE L'INVENTIONBRIEF STATEMENT OF THE INVENTION

A cet effet, on prévoit, selon l'invention, deux procédés d'authentification d'un document, le document étant pourvu d'une fenêtre au moins partiellement obturée par un film transparent portant une marque, chacune des deux procédés étant mis en oeuvre au moyen d'un capteur d'image relié à une unité informatique de traitement d'image, et comprenant les étapes de :

  • piloter le capteur d'image pour capturer au moins une image du document en présentant un arrière-plan dynamique ; et
  • piloter l'unité de traitement pour vérifier que l'arrière-plan visible dans la fenêtre sur l'image correspond à un arrière-plan attendu et vérifier que la marque est visible dans la fenêtre.
For this purpose, according to the invention, two methods of authenticating a document are provided, the document being provided with a window at least partially closed by a transparent film bearing a mark, each of the two methods being implemented by means of an image sensor connected to a computer image processing unit, and comprising the steps of:
  • control the image sensor to capture at least one image of the document presenting a dynamic background; And
  • control the processing unit to verify that the background visible in the window on the image corresponds to an expected background and verify that the mark is visible in the window.

L'un des deux procédés est conforme à la revendication 1, et l'autre procédé est conforme à la revendication 6.One of the two processes is according to claim 1, and the other process is according to claim 6.

Ainsi, avec des moyens de sécurisation du document relativement simples (une fenêtre dans laquelle est fixé un film transparent sur lequel est réalisée une marque sous la forme d'un motif ou d'une suite de caractères alphanumériques), le procédé de l'invention permet une authentification relativement fiable du document. En effet, dans le cas d'une simple photocopie du document, l'arrière-plan n'apparaît pas dans la fenêtre ou est fixe (cas d'un arrière-plan imprimé dans la fenêtre) et, dans le cas d'une photocopie du document dans laquelle une fenêtre a été découpée, la marque n'apparaît pas.Thus, with relatively simple means of securing the document (a window in which a transparent film is fixed on which a mark is made in the form of a pattern or a series of alphanumeric characters), the method of the invention allows relatively reliable authentication of the document. Indeed, in the case of a simple photocopy of the document, the background does not appear in the window or is fixed (case of a background printed in the window) and, in the case of a photocopy of the document in which a window has been cut out, the mark does not appear.

L'invention a également pour objet un procédé de validation d'une transaction entre un serveur et un terminal connectés à un réseau, le terminal comprenant un capteur d'image,
le procédé comprenant les étapes de :

  • connecter le terminal au serveur via le réseau ;
  • demander au terminal d'initier une authentification d'un document pourvu d'une fenêtre au moins partiellement obturée par un film transparent portant une marque, l'authentification étant réalisée selon l'un des deux procédés d'authentification de l'invention ;
  • valider la transaction si l'authentification est positive.
The invention also relates to a method for validating a transaction between a server and a terminal connected to a network, the terminal comprising an image sensor,
the process comprising the steps of:
  • connect the terminal to the server via the network;
  • ask the terminal to initiate authentication of a document provided with a window at least partially closed by a transparent film bearing a mark, the authentication being carried out according to one of the two authentication methods of the invention;
  • validate the transaction if the authentication is positive.

L'invention a enfin pour objet un dispositif agencé pour mettre en oeuvre ces procédés.Finally, the subject of the invention is a device arranged to implement these processes.

Le dispositif est par exemple un téléphone mobile muni d'une caméra et d'un processeur adapté au traitement d'image à réaliser ou un dispositif fixe de lecture de document.The device is for example a mobile telephone equipped with a camera and a processor adapted to the image processing to be carried out or a fixed document reading device.

D'autres caractéristiques et avantages de l'invention ressortiront à la lecture de la description qui suit de modes de mise en oeuvre particuliers non limitatifs de l'invention.Other characteristics and advantages of the invention will emerge on reading the following description of particular non-limiting modes of implementation of the invention.

BREVE DESCRIPTION DES FIGURESBRIEF DESCRIPTION OF THE FIGURES

Il sera fait référence aux dessins annexés, parmi lesquels :

  • la figure 1 est une vue schématique d'un document pour la mise en oeuvre de l'invention ;
  • la figure 2 est une vue schématique en perspective illustrant une opération de capture selon un premier mode de mise en oeuvre de l'invention ;
  • la figure 3 est une vue schématique en perspective illustrant une opération de capture selon un deuxième mode de mise en oeuvre de l'invention.
Reference will be made to the attached drawings, including:
  • there figure 1 is a schematic view of a document for the implementation of the invention;
  • there figure 2 is a schematic perspective view illustrating a capture operation according to a first mode of implementation of the invention;
  • there Figure 3 is a schematic perspective view illustrating a capture operation according to a second mode of implementation of the invention.

DESCRIPTION DETAILLEE DE L'INVENTIONDETAILED DESCRIPTION OF THE INVENTION

En référence à la figure 1, le document à authentifier est référencé D et est pourvu d'une fenêtre O dans laquelle s'étend un film transparent F pourvu d'une marque M ici une suite de caractères alphanumériques. Le film transparent est ici une bande s'étendant en travers de la fenêtre O mais le film transparent F peut occuper tout ou partie de la fenêtre O. La marque M peut également comprendre un motif géométrique ou être constituée d'un ou plusieurs motifs géométriques associés ou non à une suite de caractères alphanumériques.In reference to the figure 1 , the document to be authenticated is referenced D and is provided with a window O in which extends a transparent film F provided with a mark M here a series of alphanumeric characters. The transparent film is here a strip extending across the window O but the transparent film F can occupy all or part of the window O. The mark M can also include a geometric pattern or be made up of one or more geometric patterns associated or not with a series of alphanumeric characters.

Sur le document D, sont imprimées des informations I telles que :

  • un titre du document,
  • un nom et une date de naissance du titulaire du document,
  • une adresse du titulaire du document,
  • un nom d'un organisme ayant délivré le document,
  • une date de délivrance du document...
On document D, information I is printed such as:
  • a title of the document,
  • a name and date of birth of the document holder,
  • an address of the document holder,
  • a name of an organization that issued the document,
  • a date of issue of the document...

Bien que le document ici représenté soit un document d'identité, il est entendu que le document D peut être tout document et par exemple un billet de loterie.Although the document shown here is an identity document, it is understood that document D can be any document and for example a lottery ticket.

L'invention est ici décrite en application à un procédé de validation d'une transaction entre un serveur 1 et un terminal connectés à un réseau 50 ici le réseau Internet. Le serveur 1 est un ordinateur informatique de type classique.The invention is described here in application to a method of validating a transaction between a server 1 and a terminal connected to a network 50 here the Internet network. Server 1 is a classic type computer.

En référence à la figure 2, et selon le premier mode de mise en oeuvre, le terminal est un téléphone portable 100 comportant un capteur d'image 110 relié à une unité de traitement 120. Le téléphone portable 100 est un téléphone de type « smartphone » classique, dont seule la programmation est particulière, et qui peut se connecter via un réseau cellulaire de type GSM au réseau 50.In reference to the figure 2 , and according to the first mode of implementation, the terminal is a mobile telephone 100 comprising an image sensor 110 connected to a processing unit 120. The mobile telephone 100 is a classic "smartphone" type telephone, of which only the programming is special, and which can connect via a GSM type cellular network to network 50.

Le procédé comprend les étapes de :

  • connecter le téléphone portable 100 au serveur 1 via le réseau 50 ;
  • demander au téléphone portable 100 d'initier une authentification du document D ;
  • valider la transaction si l'authentification est positive.
The process includes the steps of:
  • connect the mobile phone 100 to the server 1 via the network 50;
  • request the mobile phone 100 to initiate authentication of the document D;
  • validate the transaction if the authentication is positive.

Le serveur 1 est ainsi programmé pour demander au téléphone mobile d'initier la transaction. Le serveur 1 peut également imposer le type de document D qui sera utilisé pour l'authentification.Server 1 is thus programmed to ask the mobile phone to initiate the transaction. Server 1 can also impose the type of document D which will be used for authentication.

L'unité de traitement 120 commande le capteur d'image 110 et exécute un programme informatique dont les instructions sont agencées pour mettre en oeuvre le procédé d'authentification selon l'invention. Pour effectuer l'authentification, l'unité de traitement 120 est programmée pour :

  • piloter le capteur d'image 110 pour capturer au moins une image du document D en présentant un arrière-plan dynamique ; et
  • pour vérifier que l'arrière-plan visible dans la fenêtre O sur l'image correspond à un arrière-plan attendu et pour vérifier que la marque M est visible dans la fenêtre O.
The processing unit 120 controls the image sensor 110 and executes a computer program whose instructions are arranged to implement the authentication method according to the invention. To carry out authentication, the processing unit 120 is programmed to:
  • control the image sensor 110 to capture at least one image of the document D presenting a dynamic background; And
  • to check that the background visible in window O on the image corresponds to an expected background and to check that the mark M is visible in window O.

Dans cette application mobile, l'arrière-plan dynamique est aléatoire et obtenu par déplacement du document D devant son environnement entre une première position et une deuxième position. Une première image et une deuxième image du document D sont successivement capturées par le capteur d'image 110 commandé par l'unité de traitement 120. La première image est capturée lorsque le document D est dans sa première position et la deuxième image est capturée lorsque le document D est dans sa deuxième position. On notera que les images peuvent être capturées alors que le document D est en mouvement si la vitesse d'acquisition du capteur est suffisamment élevée, ou la capture des images peut être réalisée lorsque le document est immobile.In this mobile application, the dynamic background is random and obtained by moving the document D in front of its environment between a first position and a second position. A first image and a second image of the document D are successively captured by the image sensor 110 controlled by the processing unit 120. The first image is captured when the document D is in its first position and the second image is captured when document D is in its second position. Note that the images can be captured while the document D is moving if the acquisition speed of the sensor is sufficiently high, or the images can be captured when the document is stationary.

Les positions de capture sont définies aléatoirement par exemple en demandant à l'utilisateur de déplacer le document en maintenant le téléphone en regard de celui-ci, de déclencher une première capture à un instant t définissant ainsi une première position et de déclencher une deuxième capture après un temps prédéterminé ou aléatoire définissant ainsi la deuxième position. L'instant t est soit prédéterminé, soit déterminé de manière aléatoire après le début du mouvement.The capture positions are defined randomly, for example by asking the user to move the document while holding the phone facing it, to trigger a first capture at a time t thus defining a first position and to trigger a second capture after a predetermined or random time thus defining the second position. The time t is either predetermined or determined randomly after the start of the movement.

Pour pouvoir localiser la fenêtre O dans l'image du document D, il est nécessaire de connaître le type de document.To be able to locate window O in the image of document D, it is necessary to know the type of document.

On peut prévoir de :

  • demander à l'utilisateur de présenter un document de type connu pour lequel l'unité de traitement connaît la position de la fenêtre O dans le document ;
  • préalablement à l'authentification, afficher un menu dans lequel l'utilisateur peut choisir le type de document qu'il souhaite faire identifier ;
  • déterminer le type de document automatiquement.
We can plan to:
  • ask the user to present a document of known type for which the processing unit knows the position of window O in the document;
  • prior to authentication, display a menu in which the user can choose the type of document he wishes to have identified;
  • determine the document type automatically.

La détermination du type de document est effectuée en pilotant l'unité de traitement pour :

  • capturer une image du document D ;
  • détecter, dans l'image, des points caractéristiques du document D et en déduire un type de document par comparaison des points caractéristiques détectés avec des points caractéristiques mémorisés dans une base de données en relation avec des types de document et la position correspondante de la fenêtre pour le type de document en question ;
  • en fonction du type de document, localiser dans l'image une position de la fenêtre du document pour y détecter l'arrière-plan.
The determination of the document type is carried out by controlling the processing unit to:
  • capture an image of document D;
  • detect, in the image, characteristic points of the document D and deduce a document type by comparing the detected characteristic points with characteristic points stored in a database in relation to document types and the corresponding position of the window for the type of document in question;
  • depending on the type of document, locate a position of the document window in the image to detect the background there.

La localisation de la fenêtre O dans l'image du document D est effectuée en repérant les bords du document D puis en en déduisant la position de la fenêtre O dans l'image par rapport aux bords du document D.The location of the window O in the image of the document D is carried out by locating the edges of the document D then by deducing the position of window O in the image relative to the edges of document D.

L'authentification est réalisée en vérifiant que l'arrière-plan visible dans la fenêtre O sur l'image correspond à un arrière-plan attendu et en vérifiant que la marque M est visible dans la fenêtre O. L'arrière-plan attendu dans la deuxième image est un arrière-plan différent de celui visible dans la première image : cet arrière-plan attendu n'est donc pas un arrière-plan prédéterminé, on s'attend juste à ce que l'arrière-plan dans la deuxième image soit différent de celui visible dans la première image.Authentication is carried out by checking that the background visible in window O on the image corresponds to an expected background and by checking that the mark M is visible in window O. The expected background in the second image is a background different from that visible in the first image: this expected background is therefore not a predetermined background, we just expect the background in the second image is different from that visible in the first image.

Cette double vérification est soit effectué par l'unité de traitement 120, l'unité de traitement 120 transférant une des images au serveur 1 après l'authentification, soit par le serveur 1, l'unité de traitement 120 transférant au serveur 1 les deux images capturées.This double verification is either carried out by the processing unit 120, the processing unit 120 transferring one of the images to server 1 after authentication, or by the server 1, the processing unit 120 transferring both to server 1 captured images.

En référence à la figure 3, et selon le deuxième mode de mise en oeuvre, le terminal est un dispositif dédié 200 comportant boîtier 250 dans lequel sont montés :

  • un capteur d'image 210 monté d'un côté d'une cavité 255 du boîtier 250 ;
  • un afficheur 230 monté d'un côté opposé de la cavité 255 du boîtier 250 pour faire face au capteur d'image 210 ;
  • une unité de traitement 220 reliée au capteur d'image 210 et à l'afficheur 230.
In reference to the Figure 3 , and according to the second mode of implementation, the terminal is a dedicated device 200 comprising a housing 250 in which are mounted:
  • an image sensor 210 mounted on one side of a cavity 255 of the housing 250;
  • a display 230 mounted on an opposite side of the cavity 255 of the housing 250 to face the image sensor 210;
  • a processing unit 220 connected to the image sensor 210 and the display 230.

La cavité 255 est agencée pour recevoir le document D et l'afficheur 230 est ici horizontal pour servir de support pour le document D lors de la capture d'image.The cavity 255 is arranged to receive the document D and the display 230 is here horizontal to serve as a support for the document D during image capture.

L'unité de traitement 220 du dispositif 200 est reliée soit directement au réseau 50, soit à un ordinateur relié au réseau 50. Lorsque le dispositif 200 est relié à un ordinateur, il constitue un périphérique de cet ordinateur.The processing unit 220 of the device 200 is connected either directly to the network 50, or to a computer connected to the network 50. When the device 200 is connected to a computer, it constitutes a peripheral of this computer.

L'afficheur 230 est agencé pour présenter ou diffuser une séquence animée derrière la fenêtre O du document D. La séquence animée constitue un arrière-plan dynamique. La séquence animée peut être une séquence vidéo ou plus simplement une combinaison d'effets lumineux basiques selon la complexité de l'afficheur 230.The display 230 is arranged to present or broadcast an animated sequence behind window O of document D. The animated sequence constitutes a dynamic background. The animated sequence can be a video sequence or more simply a combination of basic lighting effects depending on the complexity of the display 230.

La séquence animée est ici prédéterminée, c'est-à-dire qu'à tout instant de la projection on connaît ce qui est affiché, et la projection de la séquence animée et la capture d'image sont synchronisées de telle manière que l'arrière-plan attendu soit déterminable en fonction de l'instant de capture. Ainsi, on démarre la projection de la séquence animée et après qu'une durée prédéterminée ou aléatoire se soit écoulée depuis le début de la projection, on effectue la capture. A partir de la durée ainsi écoulée, il est possible de déterminer l'arrière-plan attendu.The animated sequence is predetermined here, that is to say that at any moment of the projection we know what is displayed, and the projection of the animated sequence and the image capture are synchronized in such a way that the expected background is determinable depending on the time of capture. Thus, we start the projection of the animated sequence and after a predetermined or random duration has elapsed since the start of the projection, we carry out the capture. From the duration thus elapsed, it is possible to determine the expected background.

En variante, le dispositif 200 comprend un dispositif d'éclairage 240 pour éclairer le document D lors de la capture des images.Alternatively, the device 200 includes a lighting device 240 to illuminate the document D during image capture.

L'unité de traitement 220 commande le dispositif d'éclairage 240 pour modifier une longueur d'onde d'éclairage entre deux captures d'image. La sélection de la longueur d'onde est aléatoire.The processing unit 220 controls the lighting device 240 to modify a lighting wavelength between two image captures. The wavelength selection is random.

L'arrière-plan, qui peut être statique ou dynamique, est agencé pour avoir une réponse différente aux longueurs d'onde d'éclairage utilisées pour la capture d'image.The background, which may be static or dynamic, is arranged to have a different response to the lighting wavelengths used for image capture.

Ainsi, l'arrière-plan attendu dépend à la fois de l'instant de la capture mais également du choix de la longueur d'onde rendant la fraude encore plus difficile.Thus, the expected background depends both on the moment of capture but also on the choice of wavelength making fraud even more difficult.

Si le document D a lui aussi un aspect différent selon la longueur d'onde utilisée pour l'éclairage, il est intéressant d'en capturer plusieurs images à des longueurs d'onde différentes et de comparer les images obtenues à des aspects attendus du document D à ces longueurs d'onde. Ceci complique encore la fraude.If document D also has a different appearance depending on the wavelength used for lighting, it is interesting to capture several images at different wavelengths and to compare the images obtained with expected aspects of document D at these wavelengths. This further complicates fraud.

Bien entendu, l'invention n'est pas limitée aux modes de réalisation décrits mais englobe toute variante entrant dans le champ de l'invention telle que définie par les revendications.Of course, the invention is not limited to the embodiments described but encompasses any variant falling within the scope of the invention as defined by the claims.

L'unité de traitement peut commander un dispositif de présentation d'arrière-plan derrière le document. L'arrière-plan dynamique est le résultat d'un pilotage du dispositif de présentation au moyen de paramètres de commande sélectionnés dans une bibliothèque d'arrière-plans. La sélection est aléatoire.The processing unit may control a background presentation device behind the document. The dynamic background is the result of controlling the presentation device using control parameters selected from a background library. The selection is random.

L'afficheur peut être remplacé par un fond non opaque comportant une source lumineuse de longueur d'onde changeante dans différentes bandes spectrales.The display can be replaced by a non-opaque background comprising a light source of changing wavelength in different spectral bands.

Le dispositif peut comprendre plusieurs capteurs d'image dans des bandes spectrales différentes.The device may include several image sensors in different spectral bands.

Claims (11)

  1. Method for authenticating a document (D), the document (D) being provided with a window (0) that is at least partially closed off by a transparent film (F) bearing a mark (M), the method being implemented by way of an image sensor (110) connected to an image-processing computing unit (120), and comprising the following steps:
    - driving the image sensor (110) so as to successively capture a first image of the document (D) and a second image of the document (D) while presenting a random dynamic background behind the window (O), the background presented behind the window (O) during the capture of the second image being different from the background presented behind the window (O) during the capture of the first image; and
    - driving the processing unit (120) so as to verify that the background visible within the window (O) in the second image corresponds to an expected background different from the background visible in the first image and verify that the mark (M) is visible within the window (O).
  2. Method according to Claim 1, the random dynamic background being obtained by moving the document (D) in front of its environment between a first position and a second position, the first image being captured when the document (D) is in its first position and the second image being captured when the document (D) is in its second position.
  3. Method according to Claim 2, at least one of the images being captured on-the-fly.
  4. Method according to Claim 1, comprising the step of driving the processing unit (120, 220) so as to:
    - detect, in one of the images, characteristic points of the document (D) and deduce therefrom a type of document (D),
    - depending on the type of document (D), locate a position of the window (O) of the document (D) in the image in order to detect the background therein.
  5. Method according to Claim 1, wherein the processing unit (120, 220) commands a background presentation device for presenting a background behind the document (D) and the dynamic background is the result of the presentation device being driven by way of control parameters selected from a library of backgrounds, and wherein the selection is random.
  6. Method for authenticating a document (D), the document (D) being provided with a window (O) that is at least partially closed off by a transparent film (F) bearing a mark (M), the method being implemented by way of an image sensor (210) connected to an image-processing computing unit (220), and comprising the following steps:
    - driving the image sensor (210) so as to capture at least one image of the document (D) while presenting a dynamic background; and
    - driving the processing unit (220) so as to verify that the background visible within the window (O) in the image corresponds to an expected background and verify that the mark (M) is visible within the window (O), wherein the dynamic background is obtained by projecting a predetermined animated sequence behind the window (O) of the document (D), the projection and the image capture being synchronized such that the expected background is able to be determined on the basis of the capture time.
  7. Method according to any one of the preceding claims, comprising a step of commanding an illumination device so as to illuminate the document (D) during the capture of the images.
  8. Method according to Claim 7, comprising the step of commanding the illumination device so as to modify an illumination wavelength between two image captures.
  9. Method according to Claim 8, wherein the background has a different response to the illumination wavelengths used for the two image captures.
  10. Method for validating a transaction between a server and a terminal that are connected to a network, the terminal comprising an image sensor (110, 210), the method comprising the following steps:
    - connecting the terminal to the server via the network;
    - asking the terminal to initiate authentication of a document (D) provided with a window (O) that is at least partially closed off by a transparent film (F) bearing a mark (M), the authentication being carried out in accordance with the method according to any one of the preceding claims;
    - validating the transaction if the authentication is positive.
  11. Device comprising an image sensor (110, 210) connected to a processing unit (120, 220) programmed to implement a method according to any one of the preceding claims.
EP18175401.1A 2017-06-14 2018-05-31 Method for authenticating a document having a transparent window, method for conducting transactions and device for implementing same Active EP3416141B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1755378A FR3067845B1 (en) 2017-06-14 2017-06-14 METHOD FOR AUTHENTICATING A DOCUMENT COMPRISING A TRANSPARENT WINDOW, METHOD FOR REALIZING TRANSACTIONS, AND DEVICE FOR IMPLEMENTING THE SAME

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EP3416141A1 EP3416141A1 (en) 2018-12-19
EP3416141B1 true EP3416141B1 (en) 2023-12-06
EP3416141C0 EP3416141C0 (en) 2023-12-06

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Publication number Priority date Publication date Assignee Title
US6811016B2 (en) * 2002-11-06 2004-11-02 De La Rue Cash Systems Inc. Fka Currency Systems International, Inc. Vignette inspection system
DE102011084818A1 (en) * 2011-10-19 2013-04-25 Bundesdruckerei Gmbh A method of verifying a security document with a visual barrier using a display device
US20150283847A1 (en) * 2012-11-21 2015-10-08 Pooi Nguon Lim Information Medium And A Method Of Producing The Same
US20150348019A1 (en) * 2014-05-30 2015-12-03 Visa International Service Association Image Analysis for Account Authorization

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PL3416141T3 (en) 2024-06-10
FR3067845A1 (en) 2018-12-21
EP3416141A1 (en) 2018-12-19
EP3416141C0 (en) 2023-12-06

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