JP6450709B2 - Iris authentication device, iris authentication method, and program - Google Patents

Description

  The present invention relates to an iris authentication device, an iris authentication method, and a program.

  Recently, various biometric authentication technologies have been put into practical use. For example, as one of the biometric authentication technologies, there is iris authentication. Iris authentication is performed by applying pattern recognition technology to high-resolution images of the iris of an individual's eyes. Iris authentication has a very low false positive rate and high authentication accuracy.

  Iris authentication was originally used in banks, government agencies, and military forces, but as disclosed in Patent Document 1, it is also used in information terminals such as smartphones and PCs, and is becoming widespread. is there.

JP 2012-147306 A

  As an iris authentication camera for performing iris authentication, for example, an infrared camera having high pixels and a narrow angle of view is used. The user who is the subject of iris authentication needs to confirm that his / her face and eyes are within the angle of view of the iris authentication camera. For this reason, the user's face is displayed on the monitor by live preview.

  However, there are users who feel uncomfortable with the face captured by the iris authentication camera being projected on the monitor. For example, there are many users who feel uncomfortable when a face photographed by an iris authentication camera is displayed as a black-and-white face image with raised blood vessels. In addition, there are also users who feel uncomfortable in seeing their faces imaged by a camera even temporarily due to an injury on the face.

  The present invention has been made in view of such circumstances, and an iris authentication device and an iris authentication method that can relieve a user's unpleasant feeling of looking at his / her face captured by an iris authentication camera. And to provide a program.

  In order to solve the above problems, the iris authentication apparatus, iris authentication method, and program of the present invention employ the following means.

An iris authentication apparatus according to a first aspect of the present invention is an iris authentication apparatus that performs user authentication based on an iris of a user's eye, and includes an image display unit, and an iris authentication that images an iris and a face of the user's eye. Before the user authentication based on the camera and the iris, the user is allowed to select one face image from a plurality of types of face image candidates other than humans, and the face image selected by the user is registered in advance. When it is determined that the face image authentication means for performing user authentication according to whether or not the face image being matched matches the face image selected by the user and the face image registered in advance And image display control means for causing the image display means to display the face image registered in advance instead of the face photographed by the iris authentication camera.

An iris authentication method according to a second aspect of the present invention is an iris authentication method for authenticating a user based on an iris of a user's eye, and a plurality of types of faces other than humans before the user authentication based on the iris Causing the user to select one face image from among image candidates, and performing user authentication based on whether or not the face image selected by the user matches a face image registered in advance; When the iris image and face of the eye are imaged by the iris authentication camera and the face image selected by the user matches the face image registered in advance, the image is captured by the iris authentication camera. Instead of displaying the face image registered in advance on the image display means.

The program according to the third aspect of the present invention is a program for causing a computer to execute iris authentication for performing user authentication based on the iris of the user's eye, and before the user authentication based on the iris, The user is allowed to select one face image from a plurality of types of face image candidates, and user authentication is performed based on whether the face image selected by the user matches a face image registered in advance. The iris authentication when the processing to be performed, the processing of imaging the iris and face of the user's eye with the iris authentication camera, and the face image selected by the user and the face image registered in advance match instead of the face is photographed by use camera, comprising a process of displaying the face image registered in advance in the image display means.

  ADVANTAGE OF THE INVENTION According to this invention, it has the effect that a user's discomfort with respect to seeing the own face imaged with the iris authentication camera can be relieved.

1 is a schematic external view of a notebook PC according to a first embodiment of the present invention. 1 is a block diagram showing an electrical configuration of a notebook PC according to a first embodiment of the present invention. It is a figure which shows the example when the image of the user imaged with the infrared camera is displayed on the touch panel display. It is a figure which shows the example when the avatar image which concerns on 1st Embodiment of this invention is displayed on the touchscreen display. It is a functional block diagram regarding the iris authentication function which concerns on 1st Embodiment of this invention. It is a flowchart which shows the flow of the iris authentication process which concerns on 1st Embodiment of this invention. It is a schematic external view of the notebook PC which concerns on 2nd Embodiment of this invention. It is a block diagram which shows the electric constitution of the notebook PC which concerns on 2nd Embodiment of this invention. It is a functional block diagram regarding the iris authentication function which concerns on 2nd Embodiment of this invention. It is a functional block diagram regarding the iris authentication function which concerns on 3rd Embodiment of this invention. It is a flowchart which shows the flow of the iris authentication process which concerns on 3rd Embodiment of this invention.

  Hereinafter, an embodiment of an iris authentication device, an iris authentication method, and a program according to the present invention will be described with reference to the drawings.

[First Embodiment]
The first embodiment of the present invention will be described below.

  FIG. 1 is a schematic external view of a notebook PC 1 according to the present embodiment. Note that the notebook PC 1 according to the present embodiment performs iris authentication based on the iris of the eye imaged by the infrared camera 6 as user authentication when starting an OS (Operating System) or a predetermined program, for example. Do.

  As shown in FIG. 1, the notebook PC 1 includes, for example, a main body side housing 2 and a display side housing 3 which are both substantially rectangular parallelepipeds.

  The main body side housing 2 includes an input unit 4. The input unit 4 is a user interface for performing an input operation by the user. The input unit 4 is a touch panel for moving a cursor on the screen or selecting various menus including various keys for receiving input of characters, commands, and the like. A pad, mouse, or track point is provided. The input unit 4 may be a software keyboard.

  The display-side housing 3 includes a touch panel display 5 and an infrared camera 6 that display images.

  The touch panel display 5 converts input display data into a video signal, displays various types of information according to the converted video signal on the display screen, and performs various operations performed using a user's finger and an indicator such as a touch pen. Is detected.

  The infrared camera 6 is an iris authentication camera that is used when performing iris authentication, and images the iris and face of the user's eye that is subject to iris authentication.

  The main body side housing 2 and the display side housing 3 are connected by a pair of left and right connecting portions 8a and 8b at respective end portions. The connecting portions 8a and 8b are hinges, and support the main body side housing 2 and the display side housing 3 so as to be freely opened and closed.

  FIG. 2 is a schematic diagram illustrating a hardware configuration of the notebook PC 1.

  The notebook PC 1 includes a CPU (Central Processing Unit) 20, a ROM (Read Only Memory) 21, a memory 22, an LCD (Liquid Crystal Display) 23, a graphics adapter 24, a touch sensor 25, an input controller 26, a flash memory 27, and a communication device 28. And the power supply circuit 29, and each unit including the input unit 4 and the infrared camera 6 is directly or indirectly connected via the bus 30. The touch panel display 5 includes an LCD 23 and a touch sensor 25.

  The CPU 20 controls the notebook PC 1 as a whole by the OS stored in the flash memory 27, and via the input unit 4, the touch panel display 5, the infrared camera 6, and the like based on various programs stored in the flash memory 27. It has a function of executing processing according to user operations.

  The ROM 21 stores a basic input / output system (BIOS) and various data.

  The memory 22 is composed of a cache memory and a RAM (Random Access Memory), and is a writable memory used as a work area for reading an execution program of the CPU 20 and writing processing data by the execution program.

  The LCD 23 displays the video signal from the graphics adapter 24 as an image under the control of the CPU 20.

  The graphics adapter 24 converts display information into a video signal under the control of the CPU 20 and outputs the converted video signal to the LCD 23.

  The touch sensor 25 detects the touch position of the user's finger and touch pen on the LCD 23 and outputs the detected position to the input controller 26. The touch sensor 25 selects various menus, icons, buttons, keyboards, and other screen objects displayed on the screen of the LCD 23 to perform input operations, text input operations, screen operations such as scrolling and swiping, and the like. Is performed by a user's finger or a touch pen.

  The input controller 26 performs various processes when the processor executes a program stored in the ROM 21 or the like, and controls the operation of the touch sensor 25.

  The flash memory 27 has a function of storing an OS for controlling the entire notebook PC 1, various drivers for hardware operation of peripheral devices, applications directed to specific tasks, various data and files, and the like. Note that the notebook PC 1 may include other storage means such as an HDD (Hard Disk Drive) as storage means in place of the flash memory 27.

  The communication device 28 communicates with other devices.

  The power supply circuit 29 includes an AC adapter, an intelligent battery, a charger for charging the intelligent battery, a DC / DC converter, and the like, and supplies power to each device under the control of the CPU 20.

  FIG. 3 is a diagram showing an example in which an image of the user's face (hereinafter referred to as “real face image”) 40 captured by the infrared camera 6 is displayed on the touch panel display 5 (LCD 23).

  The real face image 40 is displayed in a preset authentication image display area 41. In the authentication image display area 41, an authentication determination possible area 42 and a horizontal line 43 crossing the authentication determination possible area 42 are set in advance. The horizontal line 43 is set so as to cross a substantially central region of the angle of view of the infrared camera 6.

  In order to enable iris authentication, the user can inspect the infrared camera 6 so that the eye position of the real face image 40 coincides with the horizontal line 43 and the face occupies a predetermined ratio or more of the authentication determination possible area 42. Move yourself. At this time, the user's own face with the blood vessel raised is displayed as a real face image 40 in black and white, and there are also users who feel uncomfortable with the display of the real face image 40.

  Therefore, in the notebook PC 1 according to the present embodiment, the face of the user can be displayed on the touch panel display 5 with a face image (hereinafter referred to as “avatar image”) 44 different from the real face image 40 during the execution of iris authentication. it can.

  FIG. 4 is a diagram illustrating an example when the avatar image 44 according to the present embodiment is displayed on the touch panel display 5. In the example of FIG. 4, a cat face image is displayed as the avatar image 44, but this is an example, and the avatar image 44 can be arbitrarily selected and set by the user. It may be an image of a non-human face prepared in advance, such as an image of an animal's face, or an image of the face of itself or another person prepared in advance. Further, the avatar image 44 may be selected by the notebook PC 1 without being set by the user, or may be randomly changed for each iris authentication.

  In the example of FIG. 4, the image captured by the infrared camera 6 is not displayed on the touch panel display 5 at all, and the entire image in the authentication image display area 41 is the avatar image 44 and its background image (for example, a plain image). White). However, the present invention is not limited to this. Of the images captured by the infrared camera 6, only the human face may be the avatar image 44 and the background thereof may be the background captured by the infrared camera 6.

  FIG. 5 is a functional block diagram relating to the iris authentication function according to the present embodiment.

  The CPU 20 includes a face recognition unit 50, an avatar image reading unit 51, an image display control unit 52, a position determination unit 53, and an iris authentication unit 54. Each function of the CPU 20 is realized by a program.

  The face recognition unit 50 recognizes a human face from an image captured by the infrared camera 6.

  The avatar image reading unit 51 reads the avatar image 44 preset by the user from the memory 22.

  The image display control unit 52 displays the avatar image 44 read by the avatar image reading unit 51 on the touch panel display 5 via the graphics adapter 24.

  Note that the image display control unit 52 displays the avatar image 44 on the touch panel display 5 so that the position of the specific part of the real face image 40 and the position of the specific part of the avatar image 44 with respect to the authentication determination possible region 42 match. Let Specifically, the specific part is the eye, and the image display control unit 52 extracts the horizontal axis passing through the center position of the left and right eyes in the real face image 40 and determines the center position of the left and right eyes in the avatar image 44. Match with the horizontal axis through. The specific part is not limited to the eye, but may be another part constituting the face such as the nose, mouth, or ear.

  The image display control unit 52 displays the avatar image 44 on the touch panel display 5 following the position and size of the user's face. More specifically, the center positions of the eyes of the real face image 40 and the avatar image 44 are matched, and the movement of the avatar image 44 is made to follow the position and size of the user's face starting from this. The center position of the eye is, for example, the center position of the horizontal axis passing through the center position of the right eye and the center position of the left eye (the distance A from the right eye and the distance B from the left eye in FIGS. Matching position C).

  The position of the avatar image 44 corresponds to the position of the user's face with respect to the vertical and horizontal directions with respect to the infrared camera 6.

  On the other hand, the size of the avatar image 44 corresponds to the distance of the user to the infrared camera 6, in other words, the depth. That is, when the user is imaged at a position away from the infrared camera 6, the avatar image 44 is displayed relatively small. On the other hand, when the user is imaged near the infrared camera 6, the avatar image 44 is displayed relatively large.

  The near distance of the user with respect to the infrared camera 6 is based on the ratio of the face to the authentication image display area 41 or the angle of view of the infrared camera 6, and the positional relationship of each part constituting the face such as the eyes, mouth, and nose. Detected.

  Furthermore, when the user blinks, the image display control unit 52 has an animation function that causes the avatar image 44 to follow the blink. Thus, the user can clearly recognize that the avatar image 44 follows the movement of his / her face.

  Note that the animation function is not limited to blinking, and the avatar image 44 may follow the movement of the user's mouth and the movement of the eyebrows.

  The position determination unit 53 determines whether the eye position of the avatar image 44 (real face image 40) matches the horizontal line 43 and occupies a predetermined ratio or more of the authentication determination possible region 42.

  The iris authentication unit 54 performs iris authentication based on the iris of the eye imaged by the infrared camera 6.

  FIG. 6 is a flowchart showing a flow of iris authentication processing including the captured image replacement function according to the present embodiment. Note that the iris authentication process is executed, for example, when the user activates the notebook PC 1 to log in, or activates a predetermined program or the like.

  In step 100, imaging by the infrared camera 6 is started.

  In the next step 102, it is determined whether or not a human face has been imaged by the infrared camera 6. If the determination is affirmative, the process proceeds to step 104. Note that the face recognition unit 50 determines whether or not a human face has been imaged.

  In step 104, the avatar image 44 is displayed on the touch panel display 5.

  In the next step 106, it is determined whether or not the actual face image 40 is within a predetermined range. If the determination is affirmative, the process proceeds to step 108. If the determination is negative, the process proceeds to step 107. That is, in step 106, the position determination unit 53 determines whether the eye position of the avatar image 44 matches the horizontal line 43 and occupies a predetermined ratio or more of the authentication determination possible region 42.

  In step 107, the user is notified that the avatar image 44 is not within the predetermined range. For example, when the user is too far away from the infrared camera 6, the user is notified to prompt the user to bring the face closer to the infrared camera 6. If the user is too close to the infrared camera 6, the user is notified to urge him to keep his face away from the infrared camera 6. If the eyes of the avatar image 44 are positioned above the horizontal line 43, the infrared camera 6 is notified to urge the face to move downward. If the eyes of the avatar image 44 are positioned below the horizontal line 43, the infrared camera 6 is notified to urge the face to move upward.

  The notification method includes, for example, displaying a message on the touch panel display 5, outputting a person's voice, outputting a sound corresponding to the avatar image 44 (cat's cry), and the like. Further, an arrow image or the like indicating the position of the infrared camera 6 may be displayed on the touch panel display 5. As another notification method, the color of the outer edge of the authentication determination possible region 42 may be changed. For example, when the user is too far or too close to the infrared camera 6, the outer edge of the authentication determination possible region 42 is red. On the other hand, when the distance between the user and the infrared camera 6 is an appropriate distance, the outer edge of the authentication determination possible region 42 is green.

  Step 106 and step 107 are repeated until the avatar image 44 is within the predetermined range.

  In step 108, iris authentication is performed based on the iris of the eye imaged by the infrared camera 6. The iris authentication may be conventionally known, and for example, authentication is performed by performing image matching (pattern recognition) on previously registered user iris information and the iris imaged by the infrared camera 6.

  As described above, the notebook PC 1 that is the iris authentication apparatus according to the present embodiment is different from the face imaged by the infrared camera 6 in the human face imaged by the infrared camera 6 during the iris authentication. The image 44 is displayed on the touch panel display 5. Therefore, the iris authentication apparatus according to the present embodiment can relieve the user's uncomfortable feeling when looking at his / her face captured by the infrared camera 6 which is an iris authentication camera.

[Second Embodiment]
Hereinafter, a second embodiment of the present invention will be described.

  FIG. 7 is a schematic external view of the notebook PC 1 according to the present embodiment. Components in FIG. 7 that are the same as in FIG. 1 are given the same reference numerals as in FIG. FIG. 8 is a block diagram showing an electrical configuration of the notebook PC 1 according to the present embodiment. 8 that are the same as in FIG. 2 are assigned the same reference numerals as in FIG. 2, and descriptions thereof are omitted.

  The notebook PC 1 according to the present embodiment includes a camera 7 in the display-side housing 3.

  The camera 7 is a different camera from the infrared camera 6 that is an iris authentication camera, and is a general camera 7 that cannot image an iris to the extent that it can be used for iris authentication. That is, the camera 7 has sensitivity mainly in the visible light region, but has no sensitivity in infrared rays. The iris authentication according to the present embodiment is performed based on the iris of the eye imaged by the infrared camera 6.

  FIG. 9 is a functional block diagram relating to the iris authentication function according to the present embodiment. In FIG. 9, the same components as those in FIG. 5 are denoted by the same reference numerals as those in FIG.

  The face recognition unit 50 recognizes a human face from an image captured by the infrared camera 6 and also recognizes a human face from an image captured by the camera 7. That is, the user images his / her face simultaneously with the infrared camera 6 and the camera 7.

  The image display control unit 52 displays the face imaged by the infrared camera 6 on the touch panel display 5 via the graphics adapter 24.

  As described above, the notebook PC 1 according to the present embodiment displays not the face captured by the infrared camera 6 as a preview image but also the face image captured simultaneously by the camera 7 during the iris authentication. To display. Therefore, the notebook PC 1 according to the present embodiment can reduce the user's discomfort to see his / her face imaged by the infrared camera 6 at the time of iris authentication, and can perform iris authentication without a sense of incongruity.

  In general, the camera 7 has a wider angle of view than the infrared camera 6. For this reason, when performing the iris authentication, the notebook PC 1 according to the present embodiment first guides the user to a rough position where the iris authentication is possible by imaging the user with the camera 7 and displaying a preview image. . Thereafter, the notebook PC 1 may image the user with the infrared camera 6, display the avatar image 44 on the touch panel display 5, and perform iris authentication.

[Third Embodiment]
Hereinafter, a third embodiment of the present invention will be described.

  FIG. 10 is a functional block diagram relating to the iris authentication function according to the present embodiment, and the CPU 20 according to the present embodiment includes an avatar image authentication unit 55. 10 that are the same as in FIG. 5 are assigned the same reference numerals as in FIG. 5 and descriptions thereof are omitted.

  The memory 22 according to the present embodiment stores a plurality of different types of avatar images 44.

  The avatar image reading unit 51 reads one avatar image 44 selected by the user from the memory 22 from a plurality of different avatar image 44 candidates stored in the memory 22.

  The avatar image authentication unit 55 performs user authentication based on whether or not the avatar image 44 selected by the user matches a predetermined type of avatar image 44 (hereinafter referred to as “registered avatar image”). The registered avatar image is set in advance by the user.

  FIG. 11 is a flowchart showing a flow of iris authentication processing according to the present embodiment. In FIG. 11, the same steps as those in FIG. 6 are denoted by the same reference numerals as those in FIG.

  First, in step 200, the user selects one avatar image 44 from a plurality of different avatar image 44 candidates. As a result, the avatar image 44 selected by the user is displayed on the touch panel display 5.

  In the next step 202, it is determined whether or not the selected avatar image 44 matches the registered avatar image. If the determination is affirmative, the process proceeds to step 100. If the determination is negative, the iris authentication process itself is terminated, and the user starts again from the selection of the avatar image 44 in step 200.

  Note that the processing related to step 202 may be performed after step 108, for example.

  As described above, the notebook PC 1 according to the present embodiment authenticates the user depending on whether or not the selected avatar image 44 is the same as the registered avatar image in addition to the iris authentication. Is possible.

  As mentioned above, although this invention was demonstrated using said each embodiment, the technical scope of this invention is not limited to the range as described in the said embodiment. Various changes or improvements can be added to the above-described embodiments without departing from the gist of the invention, and embodiments to which the changes or improvements are added are also included in the technical scope of the present invention. Moreover, you may combine said each embodiment suitably.

  For example, in each of the above embodiments, the form in which the notebook PC 1 has the iris authentication function has been described. However, the present invention is not limited to this, and other types such as a desktop PC, a tablet PC, a mobile phone, and a smartphone The information processing apparatus may have an iris authentication function, or a security device when entering the building or room with the iris authentication function according to each embodiment.

  In each of the above embodiments, the infrared authentication camera 6 is used as the iris authentication camera. However, the present invention is not limited to this, and other cameras may be used as long as the iris can be imaged.

  The flow of the iris authentication process described in each of the above embodiments is also an example, and unnecessary steps are deleted, new steps are added, or the processing order is changed within a range not departing from the gist of the present invention. May be.

1 Notebook PC (iris authentication device)
5 Touch panel display (image display means)
6 Infrared camera (iris authentication camera)
7 Camera (second camera)
52 Image Display Control Unit (Image Display Control Unit)
55 Avatar image authentication unit (face image authentication means)

Claims (5)

An iris authentication device for authenticating a user based on an iris of a user's eye,
Image display means;
An iris authentication camera that images the iris and face of the user's eyes;
Prior to user authentication based on the iris, the user is allowed to select one face image from a plurality of types of face image candidates other than humans, and the face image selected in advance by the user is registered in advance. Face image authentication means for performing user authentication depending on whether or not the image matches,
When it is determined that the face image selected by the user matches the face image registered in advance, the face registered in advance instead of the face photographed by the iris authentication camera Image display control means for displaying an image on the image display means;
An iris authentication device comprising: The image display control means displays the face image as the image so that the position of the specific part of the face imaged by the iris authentication camera matches the position of the specific part of the face image registered in advance. The iris authentication apparatus according to claim 1, wherein the iris authentication apparatus is displayed on the means. The iris authentication apparatus according to claim 1, wherein the image display control unit causes the image display unit to display the face image registered in advance , following the position and size of the user's face. An iris authentication method for authenticating a user based on an iris of a user's eye,
Prior to user authentication based on the iris, the user is allowed to select one face image from a plurality of types of face image candidates other than humans, and the face image selected in advance by the user is registered in advance. Performing user authentication depending on whether the image matches,
And the iris and face of the user's eye as engineering you captured by the iris authentication camera,
When the face image selected by the user matches the face image registered in advance, the face image registered in advance is replaced with the face captured by the iris authentication camera. and the more engineering that Ru is displayed on the display means,
An iris authentication method comprising: A program for causing a computer to execute iris authentication for authenticating a user based on the iris of the user's eye,
Prior to user authentication based on the iris, the user is allowed to select one face image from a plurality of types of face image candidates other than humans, and the face image selected in advance by the user is registered in advance. A process of performing user authentication depending on whether or not the image matches,
A process of imaging the iris and face of the user's eye with an iris authentication camera;
When the face image selected by the user matches the face image registered in advance, the face image registered in advance is replaced with the face captured by the iris authentication camera. Processing to be displayed on the display means;
Including programs.

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