FR3026523A1 - BIOMETRIC AUTHENTICATION METHOD FOR A SYSTEM ADAPTED TO BE MOUNTED ON A USER'S HEAD - Google Patents

Abstract

The invention relates to a method for authenticating a user of an information system (1) adapted to be mounted on the head of a user (10), wherein the information system (1) comprises a imager (2) arranged such that at least a portion (11) of the face of the user (10) is in the acquisition field (8) of said imager, wherein - the imager (2) acquires a image of a part (11) of the face of the user (10) included in its acquisition field and transmits it to computer processing means (5), - computer processing means (5) implement a biometric authentication of the user based on said image.

Description

TECHNICAL FIELD OF THE INVENTION The present invention relates to the bionnetic authentication of a user of an information system adapted to be mounted on a computer. on the head of said user. More and more information systems adapted to be mounted on the head of a user are proposed. These information systems make it possible to display information intended for the user in his field of vision, and allow said user to interact with this information. These systems are provided with mounting means such as a mount for holding display means which are for example head-up display devices in the field of view of a user when the latter carries said system. These information systems also make it possible to let light coming from the environment of the user through the display means. These systems are most often referred to as smart glasses, and more commonly known as "smart glasses".

These information systems are used not only to display information from computing processing means to which they are connected, but also to interact with these processing means for example to select menus or scroll images. These systems are moreover most of the time connected to a communication network such as the Internet network by a wireless link. Computer resources can thus be accessed by a user of such information systems. Restricting access to these digital resources is generally done by the need to identify oneself by conventional means such as a password. However, password identification is relatively vulnerable to hacking. In addition, information systems generally have relatively limited means of interaction, since they are generally one or two buttons placed on the frame of the smart glasses, and possibly means of oculonnetry to capture the movements. of the eye which allows to determine the places where the user puts his eyes. Thus, entering text such as a password can be tedious.

PRESENTATION OF THE INVENTION The object of the invention is to remedy at least in part these disadvantages and preferentially to all, by proposing to implement a bionnetric authentication of the user of the information system from an image of at least part of the user's face. It is thus proposed a method of authenticating a user of an information system comprising a frame and adapted to be mounted on the head of a user by means of this frame, in which the information system comprises a innager arranged so as to acquire an image of a part of the face of the user, in which - the innager acquires an image of a part of the face of the user and transmits it to computer processing means, - computer processing means implement a user's bionnetic authentication on the basis of said image. This method is advantageously completed by the following characteristics, taken alone or according to any of their technically possible combinations: the innager is arranged so that at least a part of the user's face is in the field of acquisition of said innager at least when setting up the information system on the user's head, and the innager acquires said image of a part of the face of the user during the setting of the implementation in place of the information system on the user's head, before said information system is mounted on the head of the user; the method comprises the steps according to which: the information system detects a variation of a position parameter corresponding to a step of setting up said information system on the head of the user; the innager acquires said image of a part of the face of the user, said acquisition being determined by the detection of the variation of the position parameter, before said system is mounted on the head of the user, - the image is transmitted to the computer processing means for implementing the user's bionnetic authentication on the basis of said image; the mounting of the information system comprises at least one branch for mounting said information system on the user's head, and a holding member for maintaining display means in the user's field of vision when the system is mounted on the user's head, wherein the position parameter takes into account the position of the branch relative to the holding member; the information system comprises at least one motion sensor comprising at least one accelerometer and / or one gyrometer, and the position parameter takes into account a measurement provided by said at least one motion sensor; - The information display system is in standby until the detection of a variation of a position parameter corresponding to a step of setting up said information system on the head of the user; the system further comprises at least one light source configured to at least partially illuminate the field of acquisition of the innager during the acquisition by said innager of said at least one image; the light source is configured to emit in the infrared or visible range; the information system comprises a device for measuring the distance between the information display system and the user remotely, and the acquisition of the image by the innager takes into account a telenetric measurement; the innager is configured so that an eye of the user is in the field of acquisition of the innager when setting up the information system on the user's head, and the authentication Bionnetric user based on said image implements an iris recognition of the user; the user's bionnetic authentication on the basis of said image implements recognition of the user's face. The invention also relates to a computer program product comprising program code instructions recorded on a medium usable in a computer for performing the steps of the method according to any one of the preceding claims when said program is executed on a computer . The invention also relates to an information system comprising a mounting and adapted to be mounted on the head of a user by means of said frame, comprising an innager arranged so that at least a portion of the user's face is found in the acquisition field of said innager and adapted to acquire an image of said part of the face of the user, said information system being configured to implement the method according to the invention.

PRESENTATION OF THE FIGURES The invention will be better understood, thanks to the following description, which refers to embodiments and variants according to the present invention, given by way of non-limiting examples and explained with reference to the attached schematic drawings. , in which: - Figure 1 schematically illustrates an assembly consisting of an information system provided with an authentication device according to a possible embodiment of the invention; - Figure 2 schematically illustrates the implementation of the information system of Figure 1 on the head of the user. FIG. 3 is a block diagram of the bionnetric authentication method according to a possible embodiment of the invention.

In all the figures, similar elements are designated by identical reference numerals. DETAILED DESCRIPTION FIGS. 1 and 2 illustrate a possible embodiment of the invention in which the information system corresponds to smart glasses, better known by the term "smart glasses". The following description is made in a nonlimiting manner with reference to smart glasses as an information system.

The smart glasses are adapted to be mounted on the head of a user 10. For this purpose, the smart glasses comprise a frame comprising branches 4a, 4b for mounting said glasses 1 on the head of the user 10, and an organ 3, for example a circle of a telescope or a point of attachment, to maintain the display means 6 in the field of view of the user 10 when the system is mounted on the head of the user 10. display means are, for example, head-up display devices, comprising reflecting mirrors for superimposing the information displayed with the external environment, visible through these display means.

The smart glasses 1 comprise an innagator 2 arranged so that at least a portion 11 of the face of the user 10 is in the acquisition field 8 of said innager at least during the introduction of the smart glasses 1 on the head of the user, said innager 2 being adapted to acquire an image of said part of the face of the user. The acquisition field 8 of the innager 2 is therefore directed towards the user's face, and the innager can take an image of at least a part thereof. Preferably, innager 2 is disposed on the frame of the smart glasses. In the embodiment illustrated in FIGS. 1 and 2, the innager 2 is disposed on the bridge or nose support connecting the two holding members 3, or circles of the smart glasses 1. Preferably, the innager can acquire color images. The smart glasses 1 may comprise at least one light source configured to at least partially illuminate the acquisition field 8 of the innagator 2. The smart glasses 1 may further comprise different sensors. They can thus comprise at least one position sensor and / or a motion sensor comprising at least one accelerometer and / or one gyrometer. They may also include a device for measuring telenetric distance between the smart glasses 1 and the user. The smart glasses 1 also include a control unit 5 comprising a processor, and provided with a battery. The innagator 2 is connected to this control unit 5 by a wired connection 7 for passing the control signals and the image data between the innagator 2 and the control unit 5, as well as supplying power to the control unit 5. innager 2 in electrical energy. Smart glasses 1 also include means for transmitting data to computer processing means. The data transmission means typically comprise a radiofrequency transmitter, or a wired connection. The data transmitted by these data transmission means comprise, for example, the data of the image acquired by innager 2. The computer processing means are configured to implement a user's bionnetic authentication on the basis of said image. part of the user's face. These computer processing means can be embedded in the smart glasses, or be deported from them, or remote, as in the case of a computer server. In the latter case, the smart glasses communicate with this server by means of a communication network such as a local area network or the internet network via a wireless connection. With reference to FIG. a user of an information system will now be described in the context of the smart glasses illustrated in Figures 1 and 2. In the configuration illustrated in Figure 1, the smart glasses are not used, and the branches 4a, 4b are closed, that is to say arranged against the holding members 6. The smart glasses are therefore in standby (step 50). When the user 10 wants to use the smart glasses, he must put in place said smart glasses on his head. To do this, he must grasp the smart glasses 1 and spread the branches 4a, 4b to pass said branches 4a, 4b on either side of his head. It is therefore the beginning of the implementation of the smart glasses on the user's head (step Si), which can be detected by sensors in the smart glasses. Figure 2 illustrates this implementation of smart glasses.

Thus, the smart glasses 1 detect (step 52) a variation of a position parameter corresponding to a step of placing said smart glasses 1 on the head of the user 10. The positron parameter can in particular take into account the position of the branches 4a, 4b relative to the holding member 3, with a position sensor such as a contact sensor or remote, or a displacement sensor, for example capacitive. As mentioned above, the smart glasses 1 may comprise at least one motion sensor comprising at least one accelerometer and / or one gyrometer, and the position parameter can then take into account a measurement provided by said at least one sensor. movement to detect the start of the implementation of said smart glasses 1, for example an acceleration or a rotation thus detected. The detection of the variation of the position parameter activates the waking mode of the smart glasses 1. Thus, the smart glasses 1 remain in standby until the detection of a variation of a position parameter corresponding to a setting step said smart glasses 1 on the head of the user 10. In the standby mode, most of the functions of the smart glasses 1 are inactive, which saves resources such as battery power and bandwidth of the batteries. communication networks. In addition, the sprinkler 2 then acquires no image, which avoids having unnecessary images to process.

After detecting the variation of a position parameter, the innager 2 acquires (step 53) an image of a portion 11 of the face of the user 10. Preferably, said acquisition is determined by the detection of the variation of the position parameter, before the smart glasses are mounted on the user's head. Thus, the acquisition of the image is triggered for example by the detection of a movement or a position modification of the smart glasses, preferably after a latency so that the user has had time to position the images. smart glasses 1, and therefore Innager 2, in front of his face.

Indeed, the placing of the smart glasses is a privileged moment for the acquisition of an image of a portion 11 of the user's face 10, since a significant portion of said face is then in the acquisition field 8 Innueur 2, which is no longer the case when the glasses are placed on the head of the user. In addition, the launch of the authentication process as soon as the introduction of the smart glasses 1 makes it possible to authenticate the user as quickly as possible, so as not to interfere with the use of the glasses by the user. Therefore, in a preferred embodiment, the innager 2 acquires an image of a portion 11 of the user's face 10 included in the acquisition field 8 of said innager during this installation. Preferably, the innager acquires a plurality of images, in the form of a video acquisition loop, during the introduction of the smart glasses.

The end of the implementation of the smart glasses (step 55) can be defined by the flow of a predetermined time following the detection of the beginning of the establishment, of the order of a few seconds, or by the detection of another variation of a parameter, such as for example a pressure exerted on the nose support pads of the smart glasses 1. Preferably, at least one image is acquired before the end of the introduction of the glasses 10. The smart glasses 1 may include a telenetric measuring device, and the acquisition of the image by the innagator 2 takes into account a remote measurement of the distance between the smart glasses and the telescope. 10. The telennet measurement device is for example a rangefinder. In particular, the innager 2 can focus to acquire the image, by means of the distance measurement recorded by the telenetric measuring device. The innagator 2 can also achieve the development without measuring distance, and evaluate it from the development achieved. Innager 2 then constitutes a telennet measurement device. It should be noted that these distance determinations can be used to determine that the smart glasses are no longer worn by the user. Indeed, the distance in question separates the smart glasses from the user, and a distance greater than a given threshold indicates that the user 10 no longer wears the smart glasses, which makes it possible to return to standby mode. Similarly, a distance less than a given threshold indicates that the introduction of the smart glasses 1 on the head of the user 10 is complete, and that the glasses are in use by the user 10. The image acquired by innager 2 is transmitted to computer processing means for the implementation of a user bionnetric authentication 10 on the basis of said image. As indicated above, the computer processing means may be those present in the smart glasses, in particular in the control unit 5, or be remote, particularly in the case of a remote computer server. Bionnetic authentication of the user on the basis of said image may implement recognition of the face of the user, since part of it appears on the image.

The innagator 2 can be configured so that an eye 12 of the user is in the acquisition field 8 of the innager when placing the smart glasses 1 on the head of the user 10, and the user's bionnetic authentication on the basis of said image can then implement an acknowledgment of the user's iris, by the computer processing means. Alternatively or in addition, the innager 2 can acquire at least one image after the introduction of the smart glasses, and a bionnetric authentication is implemented on the basis of this image. In this respect, the innagator 2 can be configured so that an eye 12 of the user is in the acquisition field 8 of the innager when the smart glasses 1 are in place on the user's head 10 Images of the user's iris can then be acquired periodically during use of the smart glasses, and periodic user iris recognition can then be implemented, to ensure identity of the user during the use of smart glasses.

In order to improve the quality of the image acquired by the innager 2, the smart glasses may furthermore comprise at least one light source configured to at least partially illuminate the acquisition field 8 of the innagator 2 during the acquisition by said innager 2 of the image. The light source is directed towards the user. The light source may for example be an LED. The light source can emit light in the visible range, but in order to avoid dazzling the user, the light source can be configured to emit in the infrared range, and not in the visible spectrum. Moreover, the use of a light in a wavelength out of the visible spectrum can make it possible to improve the implementation of the user's bionnetic authentication on the basis of said image, particularly in the case of infrared lighting. Bionnetic authentication of the user on the basis of the image acquired by innager 2 typically comprises a comparison implemented by computer processing means between information extracted from said image, and a database stored locally in smart glasses or in a remote server with which the smart glasses communicate. The bionnetric authentication of the user on the basis of the image acquired by the innager 2 makes it possible in particular to ascertain the identity of the user, and to authorize or not access to it. secure computing resources, which may be located in the glasses or in a remote server, in particular for access to a secure system or secure data that is restricted to an authorized user, which may be identified and authenticated by the present method .

The implementation of a bionnetric authentication makes it possible in particular to avoid fraudulent use of the smart glasses 1 by an unauthorized user, especially when the smart glasses 1 are stolen, because this unauthorized user can not be used. authenticate.

It is also possible to implement a traceability of exchanges with a remote server on which these secure data are stored. In fact, the authentication thus determined can be used during the use of smart glasses, for example by allowing to sign data saved and / or exchanged with a remote server. Similarly, the image of the user's face can be recorded and used as a means of identifying the data for human beings, who will be able to recognize the face of the user. It is also possible to use the bionnetric authentication described to implement at the level of the smart glasses a virtual environment associated with the user thus authenticated. Other additional bionnetric authentications can be implemented in addition to that based on the image acquired by the innagator 2. Thus, it is possible to use a microphone of the smart glasses 1 to record the voice of the user, and to implement a speech recognition method. Similarly, the smart glasses 1 may include a fingerprint reader at the frame of the smart glasses, for example at the control unit 5, in which case the authentication can also implement a recognition method fingerprint. A fingerprint recognition can also be performed from at least one image acquired by the innager 2, making sure, during the installation phase of the system on his head, that the user present in the acquisition field of said innager 2, one of his hands with the fingers apart. It is also possible to condition the access to digital resources to the information by the user of a password. The invention is not limited to the embodiment described and shown in the accompanying figures. Modifications are possible, particularly from the point of view of the constitution of the various elements or by substitution of technical equivalents, without departing from the scope of protection of the invention.

Claims (13)

REVENDICATIONS1. A method of authenticating a user of an information system (1) comprising a mount (3, 4b) and adapted to be mounted on the head of a user (10) by means of said mount, wherein the information system (1) comprises an innager (2) arranged to acquire at least a portion (11) of the user's face (10), characterized in that - the innager (2) acquires an image of the part (11) of the user's face (10) and transmits it to computing processing means, - computer processing means (5) implement a user's bionnetric authentication on the basis of said image . 2. Method according to the preceding claim, wherein the innager (2) is arranged such that at least a portion (11) of the face of the user (10) is in the acquisition field (8) of said innager at least when setting up the information system (1) on the user's head, and the innager (2) acquires said image of a portion (11) of the user's face (12). ) during the setting of the implementation of the information system (1) on the head of the user (10), before said information system (1) is mounted on the user's head (10). 3. Method according to the preceding claim, comprising the steps according to which: the information system (1) detects (52) a variation of a position parameter corresponding to a step of setting up said information system (1); ) on the user's head (10), the innager (2) acquires said image of a portion (11) of the user's face (10), said acquisition being determined by the detection of the variation of the position parameter, before said system is mounted on the head of the user, - the image is transmitted to the computer processing means (5) for implementing the user's bionnetic authentication (10) on the basis of said image. 4. Method according to the preceding claim, wherein the mounting of the information system (1) comprises at least one leg (4a, 4b) for mounting said information system (1) on the head of the user (10). , and a holding member (3) for holding display means (6) in the field of view of the user when the system is mounted on the user's head (10), wherein the positron parameter takes in account the position of the limb (4a, 4b) with respect to the holding member (3). 5. Method according to one of claims 3 to 4, wherein the information system (1) 5 comprises at least one motion sensor comprising at least one accelerometer and / or a gyrometer, and the position parameter takes into account a measurement provided by said at least one motion sensor. 6. Method according to one of claims 3 to 5, wherein the information display system 10 is in standby until the detection of a variation of a position parameter corresponding to a setting step said information system (1) on the user's head (10). 7. Method according to one of claims 3 to 6, wherein the system further comprises at least one light source configured to at least partially illuminate the acquisition field (8) of the innager (2) during the acquisition by said innager (2) of said at least one image. 8. Method according to the preceding claim, wherein the light source is 20 configured to emit in the infrared or visible range. 9. Method according to one of claims 3 to 8, wherein the information system (1) comprises a device for remote measurement of the distance between the information display system and the user, and the acquisition of the image by the innager (2) takes into account a telenetric measurement. 10. Method according to one of the preceding claims, wherein the innager (2) is configured so that an eye (12) of the user is in the acquisition field (8) of the innager when the introduction of the information system (1) on the user's head (10), and the user's bionnetic authentication on the basis of said image implements a recognition of the iris of the user. 'user. 11. Method according to one of the preceding claims, wherein the user's bionnetic authentication on the basis of said image implements a recognition of the face of the user. A computer program product comprising program code instructions recorded on a usable medium in a computer for performing the steps of the method according to any one of the preceding claims when said program is executed on a computer. 13. Information system (1) comprising a mount (3, 4a, 4b) and adapted to be mounted on the head of a user by means of said mount, also comprising an innager (2) arranged so that at at least one part (11) of the face of the user (10) is in the acquisition field (8) of said innager (2) and adapted to acquire at least one image of said part (11) of the face of the user (10), said information system (1) being configured to implement the method of any one of claims 1 to 11.