EP1573656A1 - Method of determining the living character of an element bearing a fingerprint - Google Patents

Method of determining the living character of an element bearing a fingerprint

Info

Publication number
EP1573656A1
EP1573656A1 EP03799636A EP03799636A EP1573656A1 EP 1573656 A1 EP1573656 A1 EP 1573656A1 EP 03799636 A EP03799636 A EP 03799636A EP 03799636 A EP03799636 A EP 03799636A EP 1573656 A1 EP1573656 A1 EP 1573656A1
Authority
EP
European Patent Office
Prior art keywords
fingerprint
image
finger
interval
determining
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
EP03799636A
Other languages
German (de)
French (fr)
Inventor
Jean-Christophe Fondeur
Laurent Lambert
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.)
Idemia Identity and Security France SAS
Original Assignee
Sagem SA
Sagem Defense Securite SA
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 Sagem SA, Sagem Defense Securite SA filed Critical Sagem SA
Publication of EP1573656A1 publication Critical patent/EP1573656A1/en
Ceased legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
    • G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
    • G06V40/12—Fingerprints or palmprints
    • G06V40/13—Sensors therefor

Definitions

  • the present invention relates to a method for determining the living character of a finger by a fingerprint sensor.
  • the invention also relates to the fingerprint sensor allowing the implementation of this method.
  • any protected access becomes accessible to an authorized person by a means that only they have.
  • One of the ways to limit access to a person is to require that person's fingerprint.
  • the image of a person's fingerprint is obtained by a fingerprint sensor. Once the image of the imprint obtained by the sensor, it is transmitted to an image processing unit which compares the image obtained with a bank of image of imprints so as to verify that the imprint taken by the sensor is known. Recognition of the fingerprint by the image processing unit then gives the person to whom the fingerprint corresponds access to what they are looking for.
  • the measurement of the finger impedance is one of the methods best suited to the verification of the living character of a finger.
  • the technique consists in measuring an impedance Z between two electrodes and in comparing the value obtained by this measurement with an interval of values considered as acceptable. The technique is still sometimes deceived by imitations and the errors of discrimination remain numerous.
  • the object of the invention is therefore to propose a method for determining the living nature of an element carrying a fingerprint by a fingerprint sensor.
  • the invention relates to a method for determining the living nature of an element carrying a fingerprint, characterized in that it consists in carrying out, on the one hand, at least one electrical measurement and, on the other hand, an image of said fingerprint, then validating said or each electrical measurement by comparing it to an interval of electrical measurement values defined by a predetermined relationship linking said interval to characteristics of said image.
  • said electrical measurement is an impedance measurement.
  • said method consists in linking said characteristics of the image of the imprint and said range of acceptable values by grouping together said characteristics of the image in the form of a note, said note corresponding to a range of predefined electrical measurement values.
  • the invention also relates to a fingerprint sensor for determining the living nature of an element carrying a fingerprint.
  • the sensor is characterized in that it includes means provided for implementing the method according to one of the preceding claims.
  • Fig. 1 shows a fingerprint sensor according to the invention covered with a fingerprint-bearing element
  • Fig. 2a shows an imprint-carrying element whose imprint is wet
  • Fig. 2b represents an imprint-carrying element whose imprint is dry
  • Fig. 3a represents the image taken by the fingerprint sensor according to the invention of a wet imprint
  • Fig. 3b represents the image taken by the fingerprint sensor according to the invention of a dry fingerprint
  • the determination of the living character of an element carrying a fingerprint is carried out by electrical measurements thereon. These measurements preferably consist of impedance measurements.
  • the measurement of the impedance Z is carried out, as shown in FIG. 1, by a fingerprint sensor 1 placed in contact with the element carrying the fingerprint, here represented by a finger D.
  • An optical system SO is placed at the base of the sensor 1 so as to produce an image of the fingerprint D.
  • the fingerprint sensor 1 according to the invention comprises a plate 10 of transparent material, for example glass or transparent plastic, making it optically possible to take the fingerprint D. On the surface 11 of this plate 10, are arranged electrodes Ei and Ej between which an impedance Zij is measured.
  • connections 20 are made possible by conductive and transparent connections. These connections 20 also placed in contact with the plate 10 must necessarily be conductive and transparent so as to allow the sensor 1 to ensure both its image sensor function and its function of verifying the living character of the finger.
  • the transparency of the connections 20 is preferably obtained by deposition under vacuum of a very thin layer of material, preferably ITO (Indium tin Oxide), of thickness less than one micrometer.
  • ITO Indium tin Oxide
  • the measurement of the impedance Zij makes it possible to verify the living character of the finger by comparing the value of the impedance Zij measured with an interval Iv of values deemed acceptable for a living finger.
  • This value interval must be precisely defined in order to accept all living fingers, even those with out-of-size characteristics, but to reject false fingers having characteristics close to living fingers.
  • This interval Iv of acceptable values is defined in the invention for each of the fingers D present on the sensor 1 as a function of the characteristics of the image le of the imprint.
  • a finger D and the image of his fingerprint.
  • the fingerprint D has a relief formed by hollows also called valleys N and by bumps also called edges R (ridges in English terminology).
  • the valleys N appear in black and the edges R in white.
  • Each finger D at a given time t, gives a unique image having particular characteristics. These characteristics are for example the contrast, the average gray level of the images, the width of the edges R, the average gray level of the edges, etc.
  • the characteristics of the image are due to characteristics of the finger D, such as for example humidity.
  • the different characteristics of the image are gathered in the form of a note, for example between 0 and 1. Therefore, to an image the of a given imprint corresponds a given note.
  • a wet Dh finger There is shown by way of example in FIG. 2a, a wet Dh finger.
  • the image Ieh of the imprint of this wet finger Dh has particular characteristics.
  • a wet finger Dh plays on the contrast of the image Ieh of the imprint.
  • Figs. 2b and 3b than a finger Ds sec gives an image of the imprint of this finger Ds with little contrast.
  • the humidity of finger D is not the only characteristic of finger D to play on the characteristics of the image le.
  • the finger D influence several characteristics of the image le of the imprint.
  • several of the characteristics of the image le of the fingerprint D are used to determine the note corresponding to the image le of the fingerprint.
  • Each note between 0 and 1 is associated with an interval Iv of predefined impedance value.
  • the measured impedance value Zij belongs to the interval Iv, it will then be assumed that the finger D is alive, otherwise the finger D will be rejected by the sensor 1.
  • the method according to the invention can be implemented in parallel with d Other methods of determining the living character of an element carrying a fingerprint, such as for example a method consisting in checking the correlation between the measured impedance and the surface of the measuring electrodes.

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  • Engineering & Computer Science (AREA)
  • Human Computer Interaction (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Multimedia (AREA)
  • Theoretical Computer Science (AREA)
  • Image Input (AREA)
  • Measurement Of The Respiration, Hearing Ability, Form, And Blood Characteristics Of Living Organisms (AREA)

Abstract

The invention relates to a method of determining the living character of an element bearing a fingerprint. The inventive method is characterised in that it consists in taking (i) at least one electric measurement and (ii) an image of the fingerprint and, subsequently, validating each electric measurement by comparing same to a range of electric measurement values which is defined by a pre-established relation linking said range with characteristics of the aforementioned image.

Description

Procédé de détermination du caractère vivant d'un élément porteur d'une empreinte digitale Method for determining the living character of an element carrying a fingerprint
La présente invention concerne un procédé de détermination du caractère vivant d'un doigt par un capteur d'empreintes digitales. L'invention concerne également le capteur d'empreintes digitales permettant la mise en œuvre de ce procédé.The present invention relates to a method for determining the living character of a finger by a fingerprint sensor. The invention also relates to the fingerprint sensor allowing the implementation of this method.
De manière générale, tout accès protégé devient accessible à une personne autorisée par un moyen qu'elle seule possède. Un des moyens de limiter un accès à une personne est de requérir l'empreinte d'un doigt de cette personne. L'image de l'empreinte digitale d'une personne est obtenue par un capteur d'empreintes digitales. Une fois l'image de l'empreinte obtenue par le capteur, elle est transmise à une unité de traitement d'image qui compare l'image obtenue avec une banque d'images d'empreintes de manière à vérifier que l'empreinte prise par le capteur est connue. La reconnaissance de l'empreinte par l'unité de traitement de l'image ouvre alors à la personne à laquelle correspond l'empreinte un accès à ce qu'elle recherche.In general, any protected access becomes accessible to an authorized person by a means that only they have. One of the ways to limit access to a person is to require that person's fingerprint. The image of a person's fingerprint is obtained by a fingerprint sensor. Once the image of the imprint obtained by the sensor, it is transmitted to an image processing unit which compares the image obtained with a bank of image of imprints so as to verify that the imprint taken by the sensor is known. Recognition of the fingerprint by the image processing unit then gives the person to whom the fingerprint corresponds access to what they are looking for.
On a pu remarquer que bien que l'identification par empreintes digitales soit une méthode connue, elle pose encore des problèmes. En effet, nombreux sont les faussaires qui tentent de tromper les capteurs d'empreintes digitales avec des imitations. Les artifices notamment utilisés sont des faux doigts. Pour déjouer ces faussaires, on a proposé plusieurs méthodes permettant de déterminer si l'élément porteur de l'empreinte digitale est vivant. Certaines méthodes utilisent des moyens optiques. C'est par exemple le cas du document US-A-5 719 950 qui décrit une méthode consistant à mesurer des paramètres biométriques tels que le taux d'oxygène dans le sang, la température de la peau, etc. Le document US-A-5 737 439 décrit un système de mesure optique permettant la détection du flux sanguin à l'aide de deux longueurs d'onde différentes. D'autres méthodes consistent à réaliser des mesures électriques. C'est le cas du document JP-A-1 1197135 qui décrit la mesure des variations de capacité entre deux électrodes ou du document US-A-5 953 441 qui décrit un dispositif permettant de mesurer l'impédance complexe du doigt et de la comparer à des courbes de référence fonctions de la fréquence.It has been observed that although fingerprint identification is a known method, it still poses problems. Indeed, many are the counterfeiters who try to deceive the fingerprint sensors with imitations. The devices used in particular are false fingers. To thwart these counterfeiters, several methods have been proposed making it possible to determine whether the element carrying the fingerprint is alive. Some methods use optical means. This is for example the case of document US-A-5,719,950 which describes a method consisting in measuring biometric parameters such as the oxygen level in the blood, the temperature of the skin, etc. Document US-A-5,737,439 describes an optical measurement system allowing the detection of blood flow using two different wavelengths. Other methods include performing electrical measurements. This is the case of the document JP-A-1 1197135 which describes the measurement of the variations in capacitance between two electrodes or of the document US-A-5 953 441 which describes a device making it possible to measure the complex impedance of the finger and of the compare to frequency function reference curves.
On a remarqué au travers des méthodes déjà connues que la mesure de l'impédance du doigt est une des méthodes les mieux adaptées à la vérification du caractère vivant d'un doigt. La technique consiste à mesurer entre deux électrodes une impédance Z et à comparer la valeur obtenue par cette mesure à un intervalle de valeurs considérées comme acceptables. La technique est encore parfois trompée par des imitations et les erreurs de discrimination restent nombreuses.It has been noted through already known methods that the measurement of the finger impedance is one of the methods best suited to the verification of the living character of a finger. The technique consists in measuring an impedance Z between two electrodes and in comparing the value obtained by this measurement with an interval of values considered as acceptable. The technique is still sometimes deceived by imitations and the errors of discrimination remain numerous.
Le but de l'invention est donc de proposer une méthode de détermination du caractère vivant d'un élément porteur d'une empreinte digitale par un capteur d'empreintes digitalesThe object of the invention is therefore to propose a method for determining the living nature of an element carrying a fingerprint by a fingerprint sensor.
A cet effet, l'invention concerne un procédé de détermination du caractère vivant d'un élément porteur d'une empreinte digitale, caractérisé en ce qu'il consiste à réaliser, d'une part, au moins une mesure électrique et, d'autre part, une image de ladite empreinte digitale, puis à valider ladite ou chaque mesure électrique en la comparant à un intervalle de valeurs de mesures électriques défini par une relation préétablie liant ledit intervalle à des caractéristiques de ladite image.To this end, the invention relates to a method for determining the living nature of an element carrying a fingerprint, characterized in that it consists in carrying out, on the one hand, at least one electrical measurement and, on the other hand, an image of said fingerprint, then validating said or each electrical measurement by comparing it to an interval of electrical measurement values defined by a predetermined relationship linking said interval to characteristics of said image.
Selon une autre caractéristique de l'invention, ladite mesure électrique est une mesure d'impédance.According to another characteristic of the invention, said electrical measurement is an impedance measurement.
Selon une autre caractéristique de l'invention, ledit procédé consiste à lier lesdites caractéristiques de l'image de l'empreinte et ledit intervalle de valeurs acceptables en regroupant lesdites caractéristiques de l'image sous forme d'une note, ladite note correspondant à un intervalle de valeurs de mesures électriques prédéfinies. L'invention concerne également un capteur d'empreintes digitales permettant la détermination du caractère vivant d'un élément porteur d'une empreinte digitale. Le capteur se caractérise en ce qu'il comporte des moyens prévus pour mettre en œuvre le procédé selon l'une des revendications précédentes. Les caractéristiques de l'invention mentionnées ci-dessus ainsi que d'autres apparaîtront plus clairement à la lecture de la description suivante d'un exemple de réalisation, ladite description étant faite en relation avec les dessins joints, parmi lesquels :According to another characteristic of the invention, said method consists in linking said characteristics of the image of the imprint and said range of acceptable values by grouping together said characteristics of the image in the form of a note, said note corresponding to a range of predefined electrical measurement values. The invention also relates to a fingerprint sensor for determining the living nature of an element carrying a fingerprint. The sensor is characterized in that it includes means provided for implementing the method according to one of the preceding claims. The characteristics of the invention mentioned above as well as others will appear more clearly on reading the following description of an exemplary embodiment, said description being made in relation to the accompanying drawings, among which:
La Fig. 1 représente un capteur d'empreintes digitales selon l'invention recouvert d'un élément porteur d'empreinte ;Fig. 1 shows a fingerprint sensor according to the invention covered with a fingerprint-bearing element;
La Fig. 2a représente un élément porteur d'empreinte dont l'empreinte est humide ;Fig. 2a shows an imprint-carrying element whose imprint is wet;
La Fig. 2b représente un élément porteur d'empreinte dont l'empreinte est sèche ; La Fig. 3a représente l'image prise par le capteur d'empreintes digitales selon l'invention d'une empreinte humide ;Fig. 2b represents an imprint-carrying element whose imprint is dry; Fig. 3a represents the image taken by the fingerprint sensor according to the invention of a wet imprint;
La Fig. 3b représente l'image prise par le capteur d'empreintes digitales selon l'invention d'une empreinte sèche ;Fig. 3b represents the image taken by the fingerprint sensor according to the invention of a dry fingerprint;
Dans le procédé selon l'invention, la détermination du caractère vivant d'un élément porteur d'une empreinte digitale est réalisée par des mesures électriques sur celui-ci. Ces mesures consistent de préférence en des mesures d'impédance. La mesure de l'impédance Z est effectuée, comme cela est représenté à la Fig. 1, par un capteur d'empreintes digitales 1 placé en contact avec l'élément porteur de l'empreinte, ici représenté par un doigt D. Un système optique SO est placé à la base du capteur 1 de manière à réaliser une image de l'empreinte du doigt D. Le capteur d'empreintes digitales 1 selon l'invention comporte une plaque 10 de matière transparente, par exemple du verre ou de la matière plastique transparent, rendant optiquement possible la prise de l'empreinte du doigt D. Sur la surface 11 de cette plaque 10, sont disposées des électrodes Ei et Ej entre lesquelles est mesurée une impédance Zij. La mesure de l'impédance Zij entre les électrodes Ei, Ej est rendue possible grâce à des connexions 20 conductrices et transparentes. Ces connexions 20 placées également en contact avec la plaque 10 doivent nécessairement être conductrices et transparentes de manière à permettre au capteur 1 d'assurer à la fois sa fonction de capteur d'image et sa fonction de vérificateur du caractère vivant du doigt. La transparence des connexions 20 est obtenue de préférence par un dépôt sous vide d'une très fine couche de matériau, de préférence de l'ITO (Indium tin Oxide), d'épaisseur inférieure à un micromètre. L'ensemble de la surface du capteur 1 à l'exception des électrodes Ei, Ej est recouvert par une couche d'un matériau isolant 30 permettant de n'offrir au contact du doigt D que les électrodes Ei, Ej.In the method according to the invention, the determination of the living character of an element carrying a fingerprint is carried out by electrical measurements thereon. These measurements preferably consist of impedance measurements. The measurement of the impedance Z is carried out, as shown in FIG. 1, by a fingerprint sensor 1 placed in contact with the element carrying the fingerprint, here represented by a finger D. An optical system SO is placed at the base of the sensor 1 so as to produce an image of the fingerprint D. The fingerprint sensor 1 according to the invention comprises a plate 10 of transparent material, for example glass or transparent plastic, making it optically possible to take the fingerprint D. On the surface 11 of this plate 10, are arranged electrodes Ei and Ej between which an impedance Zij is measured. The measurement of the impedance Zij between the electrodes Ei, Ej is made possible by conductive and transparent connections. These connections 20 also placed in contact with the plate 10 must necessarily be conductive and transparent so as to allow the sensor 1 to ensure both its image sensor function and its function of verifying the living character of the finger. The transparency of the connections 20 is preferably obtained by deposition under vacuum of a very thin layer of material, preferably ITO (Indium tin Oxide), of thickness less than one micrometer. The entire surface of the sensor 1 with the exception of the electrodes Ei, Ej is covered by a layer of insulating material 30 making it possible to offer only the electrodes Ei, Ej in contact with the finger D.
Dans le procédé selon l'invention, on procède, d'une part, à la mesure de l'impédance Zij du doigt D entre deux électrodes Ei, Ej et, d'autre part, à la réalisation à l'aide du système optique SO de l'image le de l'empreinte de ce doigt D. La mesure de l'impédance Zij permet de vérifier le caractère vivant du doigt en comparant la valeur de l'impédance Zij mesurée avec un intervalle Iv de valeurs jugées acceptables pour un doigt vivant. Cet intervalle de valeur doit être défini avec précision afin d'accepter tous les doigts vivants, même ceux présentant des caractéristiques hors gabarit, mais de rejeter les faux doigts présentant des caractéristiques proches des doigts vivants. Cet intervalle Iv de valeurs acceptables est défini dans l'invention pour chacun des doigts D présents sur le capteur 1 en fonction des caractéristiques de l'image le de l'empreinte.In the method according to the invention, one proceeds, on the one hand, to the measurement of the impedance Zij of the finger D between two electrodes Ei, Ej and, on the other hand, to the realization using the optical system SW of the image le of the fingerprint of this finger D. The measurement of the impedance Zij makes it possible to verify the living character of the finger by comparing the value of the impedance Zij measured with an interval Iv of values deemed acceptable for a living finger. This value interval must be precisely defined in order to accept all living fingers, even those with out-of-size characteristics, but to reject false fingers having characteristics close to living fingers. This interval Iv of acceptable values is defined in the invention for each of the fingers D present on the sensor 1 as a function of the characteristics of the image le of the imprint.
On a représenté aux Figs. 2a, 2b, 3a, 3b un doigt D et l'image le de son empreinte. Sur ces Figs., on remarque que l'empreinte du doigt D possède un relief formé de creux aussi appelés vallées N et de bosses aussi appelées arêtes R (ridges en terminologie anglaise). Sur l'image le de l'empreinte, les vallées N apparaissent en noir et les arêtes R en blanc. Chaque doigt D, à un moment t donné, donne une image le unique possédant des caractéristiques particulières. Ces caractéristiques sont par exemple le contraste, le niveau de gris moyen des images, la largeur des arêtes R, le niveau de gris moyen des arêtes, etc. Les caractéristiques de l'image le sont dues à des caractéristiques du doigt D, comme par exemple l'humidité. Dans la pratique, les différentes caractéristiques de l'image le sont rassemblées sous la forme d'une note, par exemple comprise entre 0 et 1. Donc, à une image le d'une empreinte donnée correspond une note donnée. On a représenté à titre d'exemple à la Fig. 2a, un doigt Dh humide. L'image Ieh de l'empreinte de ce doigt Dh humide présente des caractéristiques particulières. On remarque par exemple à la Fig. 3a qu'un doigt Dh humide fait jouer le contraste de l'image Ieh de l'empreinte. A l'inverse, on remarque sur les Figs. 2b et 3b qu'un doigt Ds sec donne une image les de l'empreinte de ce doigt Ds peu contrastée. On notera que l'humidité du doigt D n'est pas la seule caractéristique du doigt D à jouer sur les caractéristiques de l'image le. De manière générale, plusieurs caractéristiques du doigt D influent sur plusieurs caractéristiques de l'image le de l'empreinte. Dans le procédé selon l'invention, on utilise plusieurs des caractéristiques de l'image le de l'empreinte du doigt D pour déterminer la note correspondant à l'image le de l'empreinte. Chaque note comprise entre 0 et 1 est associée à un intervalle Iv de valeur d'impédance prédéfini. Ainsi, à partir de l'image le de l'empreinte du doigt D, on détermine une note correspondant à un intervalle Iv de valeurs possibles pour le doigt D à ce moment t donné. On compare ensuite la valeur d'impédance Zij trouvée par la mesure entre deux électrodes avec cet intervalle Iv de valeurs acceptables et on vérifie que la valeur d'impédance Zij mesurée appartient à l'intervalle Iv ainsi défini. Si la valeur d'impédance Zij mesurée appartient à l'intervalle Iv, on admettra alors que le doigt D est vivant, sinon le doigt D sera rejeté par le capteur 1. Le procédé selon l'invention peut être mis en œuvre parallèlement à d'autres méthodes de détermination du caractère vivant d'un élément porteur d'une empreinte digitale, comme par exemple une méthode consistant à vérifier la corrélation entre l'impédance mesurée et la surface des électrodes de mesure. There is shown in Figs. 2a, 2b, 3a, 3b a finger D and the image of his fingerprint. In these Figs., We note that the fingerprint D has a relief formed by hollows also called valleys N and by bumps also called edges R (ridges in English terminology). In the image le of the footprint, the valleys N appear in black and the edges R in white. Each finger D, at a given time t, gives a unique image having particular characteristics. These characteristics are for example the contrast, the average gray level of the images, the width of the edges R, the average gray level of the edges, etc. The characteristics of the image are due to characteristics of the finger D, such as for example humidity. In practice, the different characteristics of the image are gathered in the form of a note, for example between 0 and 1. Therefore, to an image the of a given imprint corresponds a given note. There is shown by way of example in FIG. 2a, a wet Dh finger. The image Ieh of the imprint of this wet finger Dh has particular characteristics. We note for example in FIG. 3a that a wet finger Dh plays on the contrast of the image Ieh of the imprint. Conversely, we note in Figs. 2b and 3b than a finger Ds sec gives an image of the imprint of this finger Ds with little contrast. It will be noted that the humidity of finger D is not the only characteristic of finger D to play on the characteristics of the image le. In general, several characteristics of the finger D influence several characteristics of the image le of the imprint. In the method according to the invention, several of the characteristics of the image le of the fingerprint D are used to determine the note corresponding to the image le of the fingerprint. Each note between 0 and 1 is associated with an interval Iv of predefined impedance value. Thus, from the image Ie of the fingerprint D, a note is determined corresponding to an interval Iv of possible values for the finger D at this given time t. We then compare the impedance value Zij found by the measurement between two electrodes with this interval Iv of acceptable values and we verify that the measured impedance value Zij belongs to the interval Iv thus defined. If the measured impedance value Zij belongs to the interval Iv, it will then be assumed that the finger D is alive, otherwise the finger D will be rejected by the sensor 1. The method according to the invention can be implemented in parallel with d Other methods of determining the living character of an element carrying a fingerprint, such as for example a method consisting in checking the correlation between the measured impedance and the surface of the measuring electrodes.

Claims

REVENDICATIONS
1) Procédé de détermination du caractère vivant d'un élément (D) porteur d'une empreinte digitale, caractérisé en ce qu'il consiste à réaliser, d'une part, au moins une mesure électrique (Zij) et, d'autre part, une image (le) de ladite empreinte digitale, puis à valider ladite ou chaque mesure électrique (Zij) en la comparant à un intervalle (Iv) de valeurs de mesures électriques défini par une relation préétablie liant ledit intervalle (Iv) à des caractéristiques de ladite image (le).1) Method for determining the living character of an element (D) carrying a fingerprint, characterized in that it consists in carrying out, on the one hand, at least one electrical measurement (Zij) and, on the other part, an image (le) of said fingerprint, then to validate said or each electrical measurement (Zij) by comparing it to an interval (Iv) of electrical measurement values defined by a pre-established relation linking said interval (Iv) to characteristics of said image.
2) Procédé selon la revendication 1, caractérisé en ce que ladite mesure électrique est une mesure d'impédance.2) Method according to claim 1, characterized in that said electrical measurement is an impedance measurement.
3) Procédé selon la revendication 1 ou 2, caractérisé en ce qu'il consiste à lier lesdites caractéristiques de l'image (le) de l'empreinte et ledit intervalle (Iv) de valeurs acceptables en regroupant lesdites caractéristiques de l'image (le) sous forme d'une note, ladite note correspondant à un intervalle (Iv) de valeurs de mesures électriques prédéfinies.3) Method according to claim 1 or 2, characterized in that it consists in linking said characteristics of the image (le) of the imprint and said interval (Iv) of acceptable values by grouping together said characteristics of the image ( le) in the form of a note, said note corresponding to an interval (Iv) of predefined electrical measurement values.
4) Capteur d'empreintes digitales (1) permettant la détermination du caractère vivant d'un élément (D) porteur d'une empreinte digitale, caractérisé en ce qu'il comporte des moyens mettant en œuvre le procédé selon l'une des revendications précédentes. 4) Fingerprint sensor (1) allowing the determination of the living character of an element (D) carrying a fingerprint, characterized in that it comprises means implementing the method according to one of claims preceding.
EP03799636A 2002-12-20 2003-12-19 Method of determining the living character of an element bearing a fingerprint Ceased EP1573656A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR0216736 2002-12-20
FR0216736A FR2849246B1 (en) 2002-12-20 2002-12-20 METHOD FOR DETERMINING THE LIVING CHARACTER OF A CARRIER COMPONENT OF A DIGITAL IMPRINT
PCT/FR2003/003804 WO2004061758A1 (en) 2002-12-20 2003-12-19 Method of determining the living character of an element bearing a fingerprint

Publications (1)

Publication Number Publication Date
EP1573656A1 true EP1573656A1 (en) 2005-09-14

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US (1) US7657066B2 (en)
EP (1) EP1573656A1 (en)
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WO (1) WO2004061758A1 (en)

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Publication number Publication date
FR2849246A1 (en) 2004-06-25
WO2004061758A1 (en) 2004-07-22
US20060159314A1 (en) 2006-07-20
US7657066B2 (en) 2010-02-02
FR2849246B1 (en) 2006-03-10
CN100388302C (en) 2008-05-14
CN1729473A (en) 2006-02-01
AU2003299354A1 (en) 2004-07-29

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