JP2007082655A - Ocular image photographing device, living body identifying device, authentication device and registration device using the same, and method of photographing ocular image - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an ocular image photographing device capable of photographing a plurality of ocular images with different pupil diameters not under a specific environment, a living body identification device, an authentication device and a registration device using the same, and a method of photographing ocular images. <P>SOLUTION: The ocular image photographing device comprises a near image generating part 11 for generating a near image which varies in the elapse of time and an ocular image photographing part 4 for photographing a plurality of images of a subject at least including the images of eyes according to the variation of the near image. The near image generating part 11 generates the image which varies from a distant image of a prescribed object as seen from a distance to a near image of the prescribed object as seen from near in the elapse of time, or the image which varies from the near image to the distant image. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an authentication apparatus that performs personal authentication using an image of a living eye, and more specifically, an eye image capturing apparatus that captures an image including at least an eye of a person to be authenticated, a biometric determination apparatus using the same, and authentication The present invention relates to an apparatus, a registration apparatus, and an eye image capturing method.

  In recent years, as a method of personal authentication at the time of access in devices requiring high security such as entry / exit management devices and information devices storing important information such as personal information, human fingerprints, irises, fundus blood vessels, facial Various authentication methods using information unique to the person to be authenticated, such as features, blood vessel patterns of hands and arms, so-called biometric information, have been put into practical use.

  Among them, an authentication method that uses the difference in the eyelid pattern of the iris part of the eye (hereinafter referred to as “Iris Authentication”) due to its high reliability such as the high identity authentication rate and low acceptance rate of others. (Referred to as Patent Document 1, for example).

  In such an iris authentication method, an iris part is selectively encoded from an image of an eye part of the person to be authenticated (hereinafter, this image is referred to as an eye image), and the obtained information is registered in advance as authentication information. This is a method of comparing and collating with the information (hereinafter referred to as registration authentication information), and authenticating that the person to be authenticated is a person registered in advance if it is determined that they match each other.

  Conventionally, in the iris authentication method, the size of the iris imaged in the eye image differs depending on the degree of pupil opening. Therefore, when authentication information is created from eye images with different degrees of pupil opening, different authentications are used. The possibility of creating information has been pointed out. For this reason, if the degree of opening of the pupil of the person to be authenticated is different at the time of registration and at the time of authentication, there is a problem that the person to be authenticated who should be authenticated as the original person cannot be authenticated as another person (so-called person excluded as another person) There was a problem of being done.

In order to solve such a problem, for example, a plurality of eye images having different pupil diameters are photographed while illuminance is changed over time, and a plurality of pieces of registration authentication information are created from the plurality of eye images, and authentication is performed. At the time of work, a technique has been proposed for reducing the rejection rate by comparing the plurality of registered authentication information with authentication information created from the eye image of the person to be authenticated (for example, Patent Document 2). reference.).
Japanese Patent No. 3307936 JP 2000-194855 A

  However, in the conventional technology as described above, in order to change the pupil diameter of the person to be authenticated by changing the illumination with time, it is necessary to prepare an environment in which the periphery can be darkened in advance. There was a problem that a plurality of eye images with different pupil diameters could not be taken unless under a specific environment.

  The present invention has been made in view of such a problem, and an eye image capturing device capable of capturing a plurality of eye images having different pupil diameters even in a specific environment, as well as a biometric identification device and an authentication device using the same And a registration apparatus and an eye image photographing method.

  The eye image capturing device of the present invention captures a plurality of images including at least an eye of a subject corresponding to a near-field image generating unit that generates a near-field image that changes over time and a change in the near-field image. And an eye photographing unit.

  According to such a configuration, by changing the near-field image generated by the near-field image generation unit, a plurality of eye images are captured while changing the pupil diameter using the physiological reaction of the subject. It is possible to realize an eye image capturing apparatus that can capture a plurality of eye images having different pupil diameters even in a specific environment.

  In addition, the near-field image generation unit changes from a distant image when a predetermined object is viewed from a distance to a near image when a predetermined object is viewed from the vicinity, or from a near image to a distant image as time passes. The structure which produces | generates the image which changes to may be sufficient.

  According to such a configuration, it is possible to realize a configuration that can easily generate a near-field image.

  Further, the near vision image generation unit includes a near vision information generation unit that reads pre-stored information and generates a near vision image, and a near vision image formation unit that displays the near vision image and forms a near vision image. The structure which has may be sufficient.

  According to such a configuration, it is possible to capture a plurality of eye images having different pupil diameters by generating a near vision effect with a simple configuration of displaying a near vision image on the near vision image forming unit. it can.

  Further, the near-field image generation unit may include a movable object and a moving mechanism that moves the object in the front-rear direction of the subject.

  According to such a configuration, it is possible to capture a plurality of eye images with different pupil diameters by generating a near-field effect even with a mechanical configuration.

  In addition, an image quality determination unit that determines the image quality of an image captured by the eye imaging unit may be provided, and the image quality determination unit may output an image determined to have good image quality.

  According to such a configuration, since an image determined to have good image quality is output by the image quality determination unit, a configuration in which errors are unlikely to occur during post-processing such as authentication processing using the output image. Can be realized.

  Further, the image quality determination unit includes a focus degree calculation unit that calculates a focus degree of an image captured by the eye photographing unit, and the image quality determination unit has a predetermined focus degree calculated by the focus degree calculation unit. It may be configured to output an image higher than the threshold value.

  According to such a configuration, it is possible to output a more focused high-quality image.

  In addition, an eye detection unit that determines whether or not an eye is captured in an image captured by the eye imaging unit is provided, and the eye detection unit is configured to output an image determined to have captured the eye. May be.

  According to such a configuration, since an image in which an eye is photographed is output in the image, a configuration suitable for processing using an eye image such as iris authentication processing can be realized.

  Moreover, the structure provided with the guidance | guide part which guide | induces so that it may arrange | position with respect to a to-be-photographed object in the imaging | photography range of an eye imaging | photography part and a focusing range may be sufficient.

  According to such a configuration, it is possible to realize a configuration that can quickly capture a good eye image of a subject.

  Next, the living body discriminating apparatus of the present invention discriminates that the subject is not a living body when there is no difference in the size of the pupil in the plurality of images photographed by the eye photographing unit of the present invention. It is characterized by having a discrimination unit.

  According to such a configuration, while generating a near-field image that can change the pupil diameter, a plurality of eye images of the subject are captured in response to the change in the near-field image, and the iris diameter of each eye image If there is no difference between the two, it is determined that the subject is not a living body, so that a plurality of eye images having different pupil diameters can be taken even in a specific environment, and the subject can be determined based on the eye image. A possible biometric discrimination device can be realized.

  Next, an authentication apparatus according to the present invention includes an eye image capturing device according to the present invention, an authentication information creating unit that creates a plurality of authentication information from each of a plurality of images including at least eyes of a subject photographed by the eye photographing unit, A verification unit that compares and collates the registered authentication information registered in advance with a plurality of pieces of authentication information created by the authentication information creation unit, and the comparison verification result of the verification unit creates the registration authentication information and the authentication information creation unit. And an authentication unit that authenticates that the subject is a person registered in advance when it is determined that any one of the plurality of authentication information matches.

  According to such a configuration, while generating a near-view image in which the pupil diameter can be changed, a plurality of eye images of subjects having different pupil diameters are captured in response to the change in the near-view image. Since the authentication information is created from the eye image and compared with the registered authentication information, an authentication device capable of photographing a plurality of eye images with different pupil diameters and reducing the rejection rate even in a specific environment. Can be provided.

  Next, the registration device of the present invention includes an eye image capturing device of the present invention, an authentication information generating unit that generates a plurality of authentication information from each of a plurality of images including at least eyes of a subject captured by the eye capturing unit, And a registration unit that registers a plurality of authentication information created by the authentication information creation unit in the storage unit as registered authentication information.

  According to such a configuration, while generating a near-view image in which the pupil diameter can be changed, a plurality of eye images of subjects having different pupil diameters are captured in response to the change in the near-view image. Since authentication information is created from the eye image and registered as registration authentication information, a plurality of eye images with different pupil diameters can be taken even in a specific environment, and comparison with subject authentication information can be performed using this registration device. By performing the verification, it is possible to reduce the identity rejection rate.

  Next, the eye image photographing method of the present invention includes a first step of generating a near-field image that changes with the passage of time, and a subject corresponding to the change of the near-field image generated in the first step. And a second step of photographing a plurality of images including at least the eyes.

  According to such a method, a plurality of eye images of the subject are captured in response to the change in the near vision image while generating a near vision image whose pupil diameter can be changed. In both cases, it is possible to realize a method capable of photographing a plurality of eye images having different pupil diameters.

  As described above, according to the present invention, an eye image capturing device capable of capturing a plurality of eye images having different pupil diameters even in a specific environment, a living body discrimination device using the same, an authentication device and a registration device, and An eye image photographing method can be provided.

  The eye image capturing device and the eye image capturing method according to the embodiment of the present invention capture a plurality of eye images while showing a near-view image, which will be described later, to the person to be authenticated. In addition, the biometric determination device, the authentication device, and the registration device according to the embodiment of the present invention each use a plurality of eye images photographed by the eye image photographing device according to the embodiment of the present invention. It is an apparatus that performs discrimination processing, authentication processing, and registration processing. In this specification, a near-field image is a miosis phenomenon in which the pupil of the person to be authenticated changes in a direction in which the pupil becomes smaller when the image is shown to the person to be authenticated, or a mydriatic phenomenon in which the pupil becomes larger. An image that can produce a near vision effect.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In addition, the same code | symbol may be attached | subjected to the component of the same function, and the description may be omitted.

(Embodiment)
First, the authentication device 1 according to the embodiment of the present invention will be described. FIG. 1 and FIG. 2 are diagrams for explaining functions of the authentication device 1 according to the embodiment of the present invention. In the embodiment of the present invention, in order to simplify the description, three axial directions (X-axis direction, Y-axis direction, and Z-axis direction) orthogonal to each other are shown in the drawing. Note that the X-axis direction indicates the horizontal direction (the right direction from the authentication device 1 toward the authenticated person 30 is the positive direction) when viewing the authenticated person 30 from the authentication apparatus 1, and the Y-axis direction indicates the authenticated person 30. This indicates the height direction (the upward direction from the authentication device 1 toward the person to be authenticated 30 is the positive direction), and the Z-axis direction is the distance direction (from the authentication device 1 to the person to be authenticated) that connects the person to be authenticated 30 and the authentication device 1. The direction toward the authenticator 30 is the positive direction).

  In the embodiment of the present invention, a person who is to be authenticated (hereinafter referred to as a person to be authenticated) 30 approaches the authentication apparatus 1 (the person 30 to be authenticated is in the direction in FIG. 1). A case of moving to A) will be described as an example. FIG. 1 shows a case where the person 30 to be authenticated is located relatively far from the authentication device 1 (when the person is at a distance D2 in the drawing). FIG. 2 shows a state where the person 30 to be authenticated is located relatively close to the authentication apparatus 1, takes an eye image, and is subjected to authentication processing (when at a distance D <b> 3 in the drawing).

  As shown in FIG. 1 or FIG. 2, the authentication device 1 in the embodiment of the present invention is attached to the wall surface portion 60, and the distance measuring sensor unit 2 (see FIG. 1 and FIG. 1) that measures the distance to the person 30 to be authenticated. (Not shown in FIG. 2), a wide-angle image capturing unit 3 that captures a wide-angle image that captures at least both eyes of the person to be authenticated 30, and an eye image capturing unit that captures an eye image around the eye 31 of the person to be authenticated 30 4 is provided. The distance measuring sensor unit 2 and the eye photographing unit 4 are mounted on the tilt unit 6 and can be directed toward the eye 31 of the person 30 to be authenticated by changing the angle α.

  FIG. 3 is a front view of the authentication device 1 according to the embodiment of the present invention. FIG. 4A is a side view showing the configuration of the tilt unit 6 in the embodiment of the present invention, and FIG. 4B is a plan view thereof.

  In FIG. 3, the casing of the authentication device 1 is provided with a wide-angle photographing unit 3 and a speaker 55 that is a guiding unit. The tilt unit 6 is rotatably attached to the housing and has a hollow substantially semi-cylindrical shape. The distance measuring sensor unit 2, the pair of eye photographing units 4, and the pair of light source units 7 are housed therein. Further, at both end portions (both end portions in the X-axis direction in the drawing) of the tilt portion 6, a drive shaft 9 that is an axis when rotated by the tilt drive portion 5 and an opposite shaft 8 are provided. Yes. The drive shaft 9 is pivotally supported by the tilt drive unit 5, and the shaft 8 is pivotally supported by a bearing (not shown) provided in the casing of the authentication device 1. The central axes of the drive shaft 9 and the shaft 8 substantially coincide with each other, and the positions of the central axes (this axis is referred to as a tilt axis) are shown in FIGS. 3, 4A and 4B. As seen from the side, it is provided at a position passing through the center position of the lens surface of the eye photographing unit 4.

  With such a configuration, the tilt unit 6 is rotated about the center position of the lens surface of the eye photographing unit 4 in the height direction (tilt direction) with respect to the authentication subject 30 by driving the tilt driving unit 5. It becomes possible.

  A panel unit 35 is provided on the front surface of the distance measuring sensor unit 2, the eye photographing unit 4, and the light source unit 7, that is, the surface that should face the person 30 to be authenticated. The panel unit 35 is an optical filter that transmits light in the near-infrared region and absorbs light in the visible light region to some extent. The structure of the ranging sensor unit 2, the eye photographing unit 4, and the light source unit 7 from the person to be authenticated 30. It has a function to prevent the image from being seen. This is because if the structure of the distance measuring sensor unit 2, the eye photographing unit 4 and the light source unit 7 is seen from the person to be authenticated 30, the person to be authenticated 30 is intimidated and it is difficult to perform authentication with peace of mind. is there.

  Further, the authentication device 1 according to the embodiment of the present invention is an iris authentication device, and it is necessary to clearly photograph the iris pattern of the eye 31 of the person 30 to be authenticated. Therefore, as the light source unit 7 arranged to irradiate the vicinity of the eye 31 of the person 30 to be authenticated, a light source that emits near-infrared light (referred to as light having a wavelength of about 700 to 1000 nm) is used as the right eye and the left. Two units are provided corresponding to the eyes.

  As shown in FIG. 4B, a near-field image forming unit 10 is provided on the front surface of the panel unit 35 at a position where the imaging of the eye imaging unit 4 is not interrupted, that is, between the two eye imaging units 4. . In the embodiment of the present invention, a known display unit such as a liquid crystal display is used as the near vision image forming unit 10, and a near vision image is displayed on the display unit.

  In the authentication apparatus 1 according to the embodiment of the present invention, when the person 30 to be authenticated approaches the authentication apparatus 1, the wide-angle photographing unit 3 photographs the person 30 to be authenticated, and the eye 31 is captured from the image of the person 30 to be authenticated. The portion is detected, the distance D2 to the person to be authenticated 30 and the tilt angle θ of the tilt part 6 are calculated from the distance between the eyes and the size of the image, and the tilt part 6 is directed toward the eye 31 of the person 30 to be authenticated. Furthermore, the left and right eyes 31 of the person 30 to be authenticated are positioned in front of the left and right eye photographing units 4 and are located within the focusing range of the eye photographing unit 4 by the speaker 55 to the person 30 to be authenticated. Give a voice instruction to move left and right and back and forth. As a result, the eye photographing unit 4 can clearly photograph the left and right eyes 31 of the person 30 to be authenticated from the front. The details of the calculation of the tilt angle θ and the voice instruction will be described later. Here, as shown in FIG. 5B, both eyes (the right eye 33 and the left eye 32) of the person 30 to be authenticated are displayed. The following description will be given on the assumption that the front of the eye photographing unit 4 is located within the focusing range. FIG. 5A is a diagram illustrating an example of the near vision image 200 of the authentication device 1 according to the embodiment of the present invention, and FIG. 5B is a near vision of the authentication device 1 according to the embodiment of the present invention. 2 is a diagram illustrating a relationship between an image forming unit 10 and a person to be authenticated 30. FIG.

  The eye image photographing device and the authentication device 1 using the same according to the embodiment of the present invention display the near-field image 200 on the display unit that is the near-field image forming unit 10 as shown in FIG. As shown in FIG. 5B, the person 30 to be authenticated gazes at the near-field image 200 that is displayed. The form of the near vision image will be described later.

  Next, a processing function in the authentication device 1 according to the embodiment of the present invention, particularly a function for generating a near-field image will be described. FIG. 6 is a functional block diagram showing the configuration of the authentication device 1 according to the embodiment of the present invention.

  As shown in FIG. 6, the authentication device 1 according to the embodiment of the present invention includes the above-described distance measurement sensor unit 2, wide-angle imaging unit 3, a pair of eye imaging units 4, and a pair of light source units 7. The distance measuring sensor unit 2, the pair of eye photographing units 4, and the pair of light source units 7 are mounted on the tilt unit 6 as described above.

  The authentication device 1 according to the embodiment of the present invention further includes a tilt drive unit 5 that rotates the tilt unit 6 in the tilt direction, a control unit 50, a distance calculation unit 51, a height information calculation unit 52, a direction prediction unit 53, and a speaker. 55, a capture processing unit 14, an authentication processing unit 17, and an output unit 23. The distance measurement sensor unit 2, the wide-angle imaging unit 3, and the distance calculation unit 51 form a distance measurement unit 54. The authentication device 1 further includes a near-field image forming unit 10 and a near-field image information generating unit 12. The near vision image forming unit 10 and the near vision image information generation unit 12 are collectively referred to as a near vision image generation unit 11. The capture processing unit 14 includes an image quality determination unit 15 and an eye detection unit 16. The authentication processing unit 17 includes an iris detection unit 18, an authentication information creation unit 19, a registration / collation unit 20, a storage unit 21, and an authentication result determination unit 22.

  In the authentication device 1 according to the embodiment of the present invention, the near vision image generation unit 11 generates a near vision image that is a moving image whose size changes over time based on an instruction from the control unit 50. To do. In the embodiment of the present invention, moving image information capable of generating a near vision effect is stored in the near vision image information generation unit 12. When the control unit 50 instructs the near vision image generation, the near vision image information generation unit 12 supplies the near vision video information to the near vision image forming unit 10, and the near vision image forming unit 10 generates the near vision image of the video. indicate.

  Next, the operation of each functional block of the authentication device 1 according to the embodiment of the present invention and the relationship between the functional blocks will be described.

  First, an operation for guiding the person to be authenticated 30 to place the positions of both eyes within the photographing range of the eye photographing unit 4 and within the focusing range will be described.

  In the authentication device 1 according to the embodiment of the present invention, the ranging sensor unit 2 detects the distance D2 to the person 30 to be authenticated and sends the distance information to the distance calculation unit 51. The wide-angle photographing unit 3 photographs the person 30 to be authenticated and sends image information to the distance calculating unit 51. The distance calculation unit 51 calculates the distance information to the person to be authenticated 30 and supplies it to the height information calculation unit 52. The height information calculation unit 52 calculates the eye height information D1 of the person 30 to be authenticated based on the received distance information and supplies the calculated information to the direction prediction unit 53. The direction predicting unit 53 calculates a tilt angle θ that should tilt the tilt unit 6, and supplies information about the tilt angle θ to the control unit 50. The control unit 50 sends a motor drive signal corresponding to the information of the tilt angle θ to the tilt drive unit 5. The tilt drive unit 5 drives the tilt unit 6 in a direction (β) facing both eyes of the person 30 to be authenticated.

  Next, the distance measuring sensor unit 2 of the authentication device 1 according to the embodiment of the present invention detects the distance D to the face of the person 30 to be authenticated again, and transmits the distance information to the control unit 50 via the distance calculation unit 51. Send to. The control unit 50 compares the distance information with the in-focus range of the eye photographing unit 4, and when it is out of the range, supplies a voice guidance signal to the speaker 55 so that the person 30 to be authenticated moves forward or backward. Thereby, the person 30 to be authenticated can hear the voice instruction and correct the position back and forth.

  Next, the control unit 50 of the authentication device 1 according to the embodiment of the present invention instructs the light source driving unit 13 to cause the light source unit 7 to emit light. The distance calculation unit 51 calculates a deviation amount between the center position of both eyes of the person 30 to be authenticated and the center axis of the captured image of the wide-angle imaging unit 3 from the image output from the wide-angle imaging unit 3. 50. The control unit 50 supplies the speaker 55 with a voice guidance signal for instructing the person to be authenticated 30 to move left and right according to the amount of deviation. Thereby, the person 30 to be authenticated can correct the position to the left and right by listening to the voice instruction.

  As described above, in the authentication device 1 according to the embodiment of the present invention, the position of the eye 31 is arranged within the imaging range of the eye imaging unit 4 and within the focusing range with respect to the person 30 to be authenticated. The guidance part which guides may be provided. As a result, the left and right eyes of the person 30 to be authenticated are positioned in front of the left and right eye photographing units 4. FIG. 7 is a diagram showing the relationship between the authentication device 1 and the eyes of the person to be authenticated 30 in the embodiment of the present invention, and the eye photographing unit 4 includes the right eye 33 and the left eye 32. The eye images 40 and 41 in which the images are respectively located near the center of the captured image are output. The eye images 40 and 41 photographed by the eye photographing unit 4 are sent to the capture processing unit 14.

  Next, functions of the near vision image information generation unit 12 and the capture processing unit 14 of the authentication device 1 according to the embodiment of the present invention will be described. When the control unit 50 determines that the person 30 to be authenticated is located in front of the eye photographing unit 4 and located within the range of the focal length, the control unit 50 causes the near-field image information generation unit 12 to Instructs to output near-field video information. The near vision moving image information is sent to the near vision image forming unit 10, and the near vision image forming unit 10 displays the near vision image that is a moving image sent from the near vision image information generating unit 12.

  Here, the near vision image in the embodiment of the present invention will be described in detail. FIG. 8 is a diagram for explaining a near-field image in the embodiment of the present invention. As shown in FIG. 8, in the authentication apparatus 1 according to the embodiment of the present invention, the near-field image 200 is a small image having a predetermined shape shown in FIG. 8A, and a large image shown in FIG. 8B. It is a moving image that changes to. When the person 30 to be authenticated sees such a near-field image, the pupil diameter changes from a large state to a small state. This phenomenon is called miosis. The authentication device 1 according to the embodiment of the present invention captures an eye image in the process of miosis. Specifically, the control unit 50 and the capture processing unit 14 and the authentication processing unit perform the information processing described below for the eye image in the miosis process at a predetermined time ti (i = 0 to n−1). 17 and instruct.

  In the capture processing unit 14 of the authentication device 1 according to the embodiment of the present invention, the image quality of the eye images 40 and 41 output from the eye photographing unit 4 is determined by the image quality determination unit 15, and the image quality is determined to be good. The eye image is sent to the eye detection unit 16 and the eye detection unit 16 detects whether or not an eye is captured in the eye image. For example, the image quality determination unit 15 integrates predetermined high-frequency components from the eye images 40 and 41, and the eye images 40 and 41 are in focus if the amount of the high-frequency components is larger than a predetermined threshold. The degree-of-focus calculation unit 151 that determines that the image is present can be used. According to this configuration, an in-focus image can be extracted and supplied to the eye detection unit 16. As a result, the eye detection unit 16 can accurately detect the pupil and the iris.

  The image quality determination unit 15 also performs various image quality evaluations such as a luminance evaluation unit that measures the average luminance of the eye images 40 and 41 and evaluates whether the image is too bright or dark. Processing blocks to be performed can be used, and these processing blocks can be used in combination. In addition, as a method for realizing the function of the eye detection unit 16, for example, a round area estimated as a pupil or a black eye part in the eye images 40 and 41 (for example, a round area having a lower luminance than the surrounding area). ) Exists by pattern matching processing between the eye images 40 and 41 and a black (low brightness) image of a predetermined size, or a pupil that detects the position of a pupil candidate from the eye image A luminance difference calculation unit comprising a candidate detection unit and a luminance difference calculation unit that obtains a difference between the maximum value and the minimum value of the luminance of the eye image on the circumference of a circle centered on the center coordinates of the pupil candidate and having a predetermined radius A method of determining that the pupil candidate is a pupil when the output of the unit is within a predetermined threshold can be used.

  Although detailed description is omitted, the processing of the image quality determination unit 15 and the eye detection unit 16 can be realized by either software or hardware. It is possible to perform capture processing at intervals.

  Based on an instruction from the control unit 50, the capture processing unit 14 determines that the image quality determination unit 15 determines that the image quality is good near the time ti, and the eye detection unit 16 captures a pupil or iris in the image. The image data determined to be sent to the authentication processing unit 17. In the authentication processing unit 17, the iris detection unit 18 cuts out the iris portion from the image sent from the capture processing unit 14, and sends the iris partial image to the authentication information creation unit 19. The authentication information creation unit 19 creates authentication information to be used for the authentication determination process from the iris image data by a predetermined method, and sends the authentication information to the registration / collation unit 20. Therefore, in authentication device 1 according to the embodiment of the present invention, n pieces of authentication information of i = 0 to (n−1) are temporarily stored in registration / collation unit 20.

  When the authentication device 1 according to the embodiment of the present invention functions as a registration device, that is, in the registration mode in which the user 30 is newly registered, the authentication device 1 is created from the iris image data of the user 30 to be created. Further, n new pieces of authentication information i = 0 to (n−1) are stored in the storage unit 21 by the registration / collation unit 20.

  On the other hand, when the authentication device 1 according to the embodiment of the present invention functions as an authentication device, that is, in the authentication determination mode for determining whether or not the person 30 to be authenticated can be authenticated in advance, authentication The registration / verification unit 20 receives n pieces of authentication information i = 0 to (n−1) supplied by the information creation unit 19, and performs comparison and verification with a plurality of registered authentication information stored in the storage unit 21. The authentication result determination unit 22 determines whether or not the person to be authenticated 30 can be authenticated as a person who has been registered in advance based on the collation result in the registration / collation unit 20. The determination result of the authentication result determination unit 22 is sent to the output unit 23, and the output unit 23 displays the determination result, responds with sound, maintains or releases the door lock, and the like. Although detailed description is omitted, the processes of the iris detection unit 18, the authentication information creation unit 19, the registration / collation unit 20, and the authentication result determination unit 22 can be realized by either software or hardware. By using hardware, authentication processing can be performed at a cycle of about 200 ms.

  The control unit 50 of the authentication device 1 according to the embodiment of the present invention monitors the operation status of the capture processing unit 14 and the authentication processing unit 17 described above, and determines the operation of the capture processing unit 14 or the authentication processing unit 17 as necessary. Control and so on. For example, when the eye position of the eye image is shifted and the detection of the eye is incomplete, the tilt control is performed again, and control for instructing the position of the person 30 to be authenticated is performed.

  In the above example, the iris detection unit 18 detects an iris from the image, the authentication information creation unit 19 creates an iris pattern authentication information from the iris image, and the registration / collation unit 20 performs comparison verification. As a method and a determination method of the authentication result in the authentication result determination unit 22, a known method can be used, and for example, the method disclosed in Patent Document 1 described above can be used. However, in the authentication apparatus of the present invention, the authentication processing method in the authentication processing unit 17 is not limited to the above-described method. For example, the authentication processing unit 17 may use a method of directly comparing the image sent from the capture processing unit 14 with the image stored in advance in the storage unit 21 without creating authentication information. Is possible.

  Here, the near-field effect brought to the person 30 to be authenticated by the authentication device 1 according to the embodiment of the present invention will be described in detail. FIG. 9 is a diagram for explaining the near vision effect provided to the person 30 to be authenticated in the embodiment of the present invention, and FIG. 9A is a conceptual diagram of the process of changing the iris of the eye image in miosis. It is.

  As shown in FIG. 9A, first, when the subject person 30 is shown a small image corresponding to the near-view image 200 as shown on the left side of FIG. A mydriatic condition with a large iris inner diameter. In this state, when the near-field image 200 is changed to a large image, the pupil of the person to be authenticated 30 gradually contracts. When a large image corresponding to an image when the object is viewed from the vicinity is displayed as the near-field image 200, the inner diameter of the iris is reduced and a miosis state is obtained. In such a changing process of moving from a far-field image to a near-field image, the authentication device 1 according to the embodiment of the present invention performs a plurality of authentications from an eye image photographed at time ti (i = 0 to n−1). Information will be created. The iris can be expanded and contracted in the radial direction by the dilated pupil and the sphincter of the pupil. The iris is striped so that it can be easily expanded and contracted. The stripe pattern of the iris changes as the iris expands and contracts in the radial direction due to miosis and mydriasis. In the mydriatic state, the amount of wrinkles increases, and in the miosis state, the wrinkles stretch. In addition, since the change of the stripe occurs based on the original stripe approach (so-called iris pattern) that differs depending on the individual, the individual difference is also reflected in the way the change of the stripe pattern occurs. Therefore, by performing authentication processing using authentication information based on n eye images, authentication determination can be performed without error.

  For example, when the authentication apparatus 1 according to the embodiment of the present invention is used in the authentication mode, one of the n pieces of authentication information obtained from the eye image of the person to be authenticated 30 matches the registered authentication information. If it is determined that the person to be authenticated 30 is a person who has been registered in advance, the authentication is permitted, and in other cases, if authentication is denied, the person to be authenticated 30 that has been registered in advance is rejected. The probability (percent rejection rate) to do can be reduced.

  In the authentication device 1 according to the embodiment of the present invention, the plurality of eye images captured while showing a near-field image with respect to the person to be authenticated 30 have different eye pupil diameters. Therefore, the authentication device 1 according to the embodiment of the present invention can determine whether or not the person 30 to be authenticated is a living body using this phenomenon, that is, can function as a living body discrimination device. . Specifically, for each eye image output from the capture processing unit 14, information indicating the pupil diameter calculated by the iris detection unit 18 is sent to the control unit 50. If the pupil diameter does not differ from eye image to eye image, that is, if it is determined that they are substantially the same, it is likely that the subject is a fake that is not a living eye, and the subsequent processing is stopped and an alarm is generated. It is possible. In the authentication device 1 according to the embodiment of the present invention, the eyes are continuously photographed a plurality of times while displaying a near-field image, so that the pupil diameter is continuously changed using a counterfeit such as a fake eye. It is extremely difficult.

  In the above description, eye images having different pupil diameters are captured using the miosis effect of the eye. Needless to say, the mydriatic effect may be used. When the mydriatic effect is used, the near-field image information generation unit 12 of the near-field image generation unit 11 shifts from a large image as shown on the right side of FIG. 8 to a small image as shown on the left side of FIG. Such near-field image information is stored and sent to the near-field image forming unit 10. As a result, as shown in FIG. 9B, the near-field image forming unit 10 has the pupil diameter of the person 30 to be authenticated initially in the miosis state, and then gradually increases and shifts to the mydriatic state. . In this process, a plurality of eye images at time ti (i = 0 to n−1) can be taken, and authentication information can be created from each eye image.

  In the example shown in FIG. 9, an example in which the time ti (i = 0 to n−1) is equally spaced is shown regardless of whether the contraction effect or the mydriatic effect is used. The invention is not limited to this example, and the time intervals at which the eye images are taken may be unequal. If the interval at which the eye image is captured is kept secret, a person who is impersonating and authenticating with a counterfeit changes the pupil diameter of the counterfeit according to the interval pattern at which the eye image is captured. It becomes difficult and safety increases. Further, in the authentication mode, the authentication information created from the eye image of the person to be authenticated 30 is not collated with all the registered authentication information (so-called 1: N authentication), but a personal ID is input for each person to be authenticated 30. Thus, in the method of collating with the registered authentication information corresponding to the ID (so-called 1: 1 authentication), the interval pattern for taking an eye image is made different for each personal ID, and the personal ID matches. Can further improve the authentication rate by using the time interval pattern used at the time of authentication registration at the time of authentication determination.

  Further, the ratio of the change in the size of the near vision image shown in FIGS. 9A and 9B with the passage of time may be changed on the way. Specifically, it is possible to slowly change the size of the near-field image at first and increase the speed of changing from the middle. If this time change pattern is kept secret, it is difficult for the spoofer to change the pupil diameter of the forgery in accordance with the time change pattern of the near vision image, which increases safety. In the method of inputting the personal ID for each person to be authenticated 30 (1: 1 authentication method), the time change pattern is made different for each individual, and when the personal ID matches, the time change pattern used at the time of authentication registration Can be used at the time of authentication determination, the authentication rate can be further improved. Note that the near vision effect may be more likely to occur when the rate of change of the near vision image with the passage of time is changed in the middle. If the near vision image is changed with a different change pattern for each person 30 to be authenticated and stored, it is possible to realize a configuration in which a near vision effect is more easily generated.

  In addition, the near vision image generation unit 11 of the authentication device 1 according to the embodiment of the present invention reads the information stored to generate the near vision image and generates a near vision image, Although the example which has the near vision image formation part 10 which displays this near vision image and produces | generates a near vision image was shown, the information regarding the near vision image which the near vision information production | generation part 12 memorize | stores Any data may be used. For example, a shape parameter representing the shape of a near vision image is stored in a memory, read out, a near vision image is generated by a computer graphic function, and the near vision image is changed while changing the image size over time. What is necessary is just to display the near vision image which supplies to the display apparatus which is the formation part 10, and moves. It is also possible to store a moving image in which the near-field image moves back and forth in a memory and read it out for video playback display.

  Further, in the authentication device 1 according to the embodiment of the present invention, the near-field image displayed on the person to be authenticated 30 is not particularly limited in shape or the like, but in the case of a distant image (small image), In the vicinity image (large image), the near-field image that seems to expand more may cause the near-field effect more reliably. For this reason, the near-field image may be a planar image, but a shape in which the central portion swells toward the person to be authenticated 30 like a sphere or a pointed shape is more desirable. Further, the far-field image (small image) is the same as that taken with a normal camera, and the near-field image (large image) is approached to the person 30 to be authenticated, such as a close-up image taken with a fisheye lens. The intermediate image may be an intermediate image. Furthermore, if the near-field image forming unit 10 is used as a stereoscopic display device, stereoscopic image data is supplied from the near-field image information generating unit 12 so that the person to be authenticated 30 can see a stereoscopic near-field image, the miosis, The mydriatic phenomenon may occur more reliably. In addition, the near-field image forming unit 10 may be configured to show the person to be authenticated 30 a three-dimensional near-field image created by a hologram.

  The authentication registration operation of the authentication apparatus 1 according to the embodiment of the present invention described above can be realized by control of the computer system or information processing. FIG. 10 is a flowchart showing a procedure for registering authentication information when realized by a computer.

  FIG. 10 is a flowchart showing processing steps when the authentication device 1 according to the embodiment of the present invention is used as a registration device.

  At the start of this procedure shown in FIG. 10, it is assumed that both eyes of the person 30 to be authenticated are located in front of the eye photographing unit 4 and within a focal length range.

  First, photographing of the eye image of the person 30 to be authenticated is started by the wide-angle photographing unit 3, and eye image information is acquired (S10).

  Next, the control unit 50 performs eye detection from the eye image information (S11).

  If the eye detection is successful in step S11, the process proceeds to step S13. If the eye is not detected, the process proceeds to step S22, and the control unit 50 passes the speaker 30 through the speaker 55. A position correction instruction is issued (S22), and the process returns to step S11.

  In step S13, a near-field image is generated, that is, near-field image formation and output processing is performed. Specifically, the near vision information stored in the memory unit of the computer system is read out, supplied to the near vision image forming unit 10 in the form of near vision image data, and the near vision image display is started (S13).

  Next, the control unit 50 sets a parameter i provided in the computer system to i = 0, and sets a timer to t = t0 (S14).

  Then, capture processing by the capture processing unit 14 is performed (S15). The capture process is a process of sending, to the authentication processing unit 17, a high-quality eye image obtained by photographing an eye from the eye image input from the eye photographing unit 4.

  Next, the iris detection unit 18 extracts the iris portion from the eye image, and the authentication information creation unit 19 creates authentication information (S16).

  The authentication information created in step S16 is temporarily stored in the registration / collation unit 20 (S17), and the control unit 50 increases the parameter i by 1 (S18). Thus far, the process at t = t0 ends.

  Next, the control unit 50 determines whether or not the parameter i has reached the required number n of eye images. If No, the control unit 50 waits until the time of the timer reaches t1 in step S20. Returning to FIG. 4, the capture processing, feature extraction processing, and feature data storage at t = t1 are performed (S15 to S18), and the processing at t = t1 is terminated.

  If it is determined in step S19 that the parameter i = n, the process proceeds to step S21, and the registration / collation unit 20 stores n pieces of authentication information i = 0 to (n−1) in the storage unit 21. Store as registered authentication information. Specifically, it is stored in a non-volatile storage medium or memory of the computer system.

  Through the above processing steps, the authentication device 1 according to the embodiment of the present invention captures a plurality of eye images having different pupil diameters while showing a near-field image to the person 30 to be authenticated, and creates each of the plurality of eye images. It is possible to store the authenticated authentication information as registered authentication information.

  Next, processing steps when the authentication device 1 according to the embodiment of the present invention is used in the authentication mode will be described. FIG. 11 is a flowchart showing processing steps when the authentication device 1 according to the embodiment of the present invention is used in the authentication mode.

  As shown in FIG. 11, the steps of acquiring n pieces of authentication information corresponding to the process of changing the near-field image, that is, the steps from Step S10 to Step S20, and Step S22 are the registration described in FIG. Since it is the same as the operation step in the mode, only different parts will be described.

  In step S19, if the parameter i = n, the process proceeds to step S31. The registration / collation unit 20 collates whether or not the n pieces of authentication information temporarily stored are similar to the registration authentication information stored in the storage unit 21 (S31). Specifically, one of n pieces of authentication information is selected and compared with each of registered authentication information, and the degree of dissimilarity (for example, Hamming distance) is calculated. If the degree of dissimilarity is within a predetermined threshold, , It is determined that they match each other. The same determination is performed for n pieces of authentication information. The authentication result determination unit 22 determines that the authentication result is “authentication OK (the person to be authenticated 30 is a person registered in advance) when the registration / verification unit 20 matches even one piece of authentication information with the registered authentication information. The authentication result is output from the output unit 23. On the other hand, if all the authentication information does not match all the registered authentication information, the authentication result is set to “authentication NG” and the determination result is output from the output unit 23 (S32).

  By performing the above processing, the authentication device 1 in the embodiment of the present invention captures a plurality of eye images having different pupil diameters while showing a near-field image to the person 30 to be authenticated, and each of the plurality of eye images. It is possible to compare and verify authentication information created from the above and authentication information registered in advance.

  In the above-described example, an example is shown in which if at least one of a plurality of pieces of authentication information matches the registered authentication information registered in advance, the authenticated person 30 is authenticated as a previously registered person. However, it goes without saying that the present invention is not limited to this example. For example, if a part of the authentication information, a majority of the authentication information, or all the authentication information matches the registered authentication information registered in advance, the person 30 who has been registered in advance Can be authenticated, and in this case, it is possible to realize a high security configuration with a lower acceptance rate of others.

  Further, in the embodiment of the present invention, the near-field image generation unit 11 of the authentication device 1 is generated as a near-field image information generation unit 12 that generates near-field image information that is electronically created image information. Although the configuration having the near-field image forming unit 10 for displaying near-field image information is shown, the present invention is not limited to this example.

  FIG. 12 is a diagram illustrating another example of the near-field image generation unit 11 of the authentication device 1 according to the embodiment of the present invention. In the example shown in FIG. 12, the near-field image generating unit 11 is installed between the eye photographing units 4.

  As shown in FIG. 12, the near vision image generation unit 11 is used for near vision in the form of a star or a sphere as the near vision image formation unit 10 in a box-shaped housing with an empty front (Z direction). An object 10a is provided. The near vision object 10a is movable in the direction of the eye of the person 30 to be authenticated, as indicated by the dashed arrow. A part where the casing and the panel unit 35 are in contact with each other is substantially transparent so that the near object 10a can be seen by the person 30 to be authenticated. Although the movement mechanism of the near vision object 10a is not particularly illustrated, it can be realized by a known mechanism such as a motor, a lever, a cam, and a feed screw. The controller 50 controls the motor drive.

  In such a configuration, the person to be authenticated 30 watches the near object 10a moving from the back of the housing to the front. At this time, a miosis phenomenon occurs due to the near vision effect. When moving the near object 10a from the near side to the back side, a mydriatic phenomenon occurs. The near object 10a may be illuminated or emitted so that it can be easily seen. You may make it the magnitude | size or shape change according to a movement. For example, the near object 10a may be a balloon-like container, which may be inflated as it approaches the person 30 to be authenticated.

  Furthermore, there is a case where the near vision effect is more likely to occur when the movement speed of the near vision object 10a is changed in the middle, and the change pattern of the movement speed of the near vision object 10a that is likely to cause the near vision effect is If it is customized and stored in advance for each individual and the movement speed is changed with a different change pattern for each person 30 to be authenticated, a configuration in which a near-sight effect is more likely to be generated can be realized.

  In the authentication device 1 according to the embodiment of the present invention, the authentication result determination unit 22 in the authentication processing unit 17 receives the authentication target information when either the right eye or the left eye of the person to be authenticated 30 matches the registered authentication information. The configuration may be such that the authenticator 30 is authenticated as a pre-registered person, and if both the right eye and the left eye of the authenticated person 30 match the registered authentication information, the authenticated person 30 It may be configured to authenticate that the person is registered in advance. In the former case, it is possible to provide the authentication device 1 capable of reducing the identity rejection rate, and in the latter case, it is possible to provide the authentication device 1 capable of reducing the acceptance rate of others. Can be selected according to the request.

  Further, as the output unit 23 of the authentication device 1 in the embodiment of the present invention, for example, a well-known display unit such as a liquid crystal display device, a unit that can notify the authentication result 30 to the user 30 by voice, Furthermore, various known output means such as means capable of transmitting a signal to an externally connected server device or the like can be used.

  In the authentication device 1 according to the embodiment of the present invention, the control unit 50 instructs the light source driving unit 13 to drive the light source unit 7 to be turned on, off, or blinking. When irradiating 30 eyes 31, it is desirable to perform irradiation while blinking in synchronization with the electronic shutter of the eye photographing unit 4 from the viewpoint of reducing power consumption.

  In the embodiment of the present invention, the example has been described in which the authentication device 1 authenticates the person using the iris authentication method. However, the authentication device of the present invention is limited to the iris authentication device. is not. Needless to say, the present invention can be applied to, for example, retina authentication.

  Further, in the authentication device 1 according to the embodiment of the present invention, the tilt drive unit 5 has been described as having a configuration in which the tilt unit 6 is automatically directed toward the face of the person 30 to be authenticated. There is no limitation to this configuration, and a handle may be provided in the tilt unit 6 so that the person 30 to be authenticated operates by himself / herself and faces toward his / her face.

  As described above, by using the eye image capturing device according to the present invention and the biometric device, the authentication device and the registration device, and the eye image capturing method using the eye image capturing device, a plurality of different pupil diameters can be obtained even in a specific environment. Since it is possible to produce a special effect that an eye image can be captured, an authentication device that performs personal authentication using an image of a living eye, and more specifically, an eye image capturing that captures an image including at least the eye of the person to be authenticated. It is useful as a device, a living body discrimination device using the device, an authentication device, a registration device, an eye image photographing method, and the like.

The figure for demonstrating the function of the authentication apparatus in embodiment of this invention The other figure for demonstrating the function of the authentication apparatus in embodiment of this invention The front view of the authentication apparatus in embodiment of this invention (A) is a side view showing the configuration of the tilt section in the embodiment of the present invention, (b) is a plan view showing the configuration of the tilt section in the embodiment of the present invention. (A) is a diagram showing an example of the near-field image of the authentication device in the embodiment of the present invention. (B) is a relationship between the near-field image forming unit of the authentication device and the person to be authenticated in the embodiment of the present invention. Figure showing Functional block diagram showing a configuration of an authentication device in an embodiment of the present invention The figure which shows the relationship between the authentication apparatus in embodiment of this invention, and a to-be-authenticated person's eyes. The figure for demonstrating an example of the near vision image in embodiment of this invention The figure for demonstrating the near vision effect brought about to a to-be-authenticated person in embodiment of this invention The flowchart which shows the processing step at the time of using the authentication apparatus in embodiment of this invention as a registration apparatus. The flowchart shown about the processing step at the time of using the authentication apparatus in embodiment of this invention in authentication mode. The figure which shows the other example of the near image generation part of the authentication apparatus in embodiment of this invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Authentication apparatus 2 Distance sensor part 3 Wide-angle imaging | photography part 4 Eye imaging | photography part 5 Tilt drive part 6 Tilt part 7 Light source part 8 Axis 9 Drive axis 10 Near vision image formation part 10a Near vision image object 11 Near vision image generation part 12 Near Image information generating unit 13 Light source driving unit 14 Capture processing unit 15 Image quality determination unit 16 Eye detection unit 17 Authentication processing unit 18 Iris detection unit 19 Authentication information creation unit 20 Registration / verification unit 21 Storage unit 22 Authentication result determination unit 23 Output unit 30 person to be authenticated 31 eye 32 left eye 33 right eye 35 panel unit 40, 41 eye image 50 control unit 51 distance calculation unit 52 height information calculation unit 53 direction prediction unit 54 distance measurement unit 55 speaker 60 wall surface unit 151 degree of focus Calculation unit 200

Claims (12)

A near-field image generating unit that generates a near-field image that changes over time;
An eye image photographing apparatus comprising: an eye photographing unit that photographs a plurality of images including at least eyes of a subject in response to the change in the near-field image. The near-field image generation unit changes from a distant image when the predetermined object is viewed from a distance to a near image when the predetermined object is viewed from the vicinity, or from the vicinity image as the time passes, The eye image capturing apparatus according to claim 1, wherein an image that changes to a distant image is generated. The near vision image generation unit reads out information stored in advance and generates a near vision image, and a near vision image formation unit that displays the near vision image and forms the near vision image. The eye image photographing device according to claim 1, wherein the eye image photographing device is provided. The eye image capturing apparatus according to claim 1, wherein the near-field image generation unit includes a movable object and a moving mechanism that moves the object in the front-rear direction of the subject. An image quality determination unit for determining the image quality of an image captured by the eye imaging unit;
The eye image capturing device according to any one of claims 1 to 4, wherein the image quality determination unit outputs an image determined to have good image quality. The image quality determination unit includes a focus degree calculation unit that calculates a focus degree of an image photographed by the eye photographing unit,
The eye image capturing device according to claim 5, wherein the image quality determination unit outputs an image having a degree of focus calculated by the focus level calculation unit higher than a predetermined threshold. An eye detection unit for determining whether an eye is captured in the image captured by the eye imaging unit;
The eye image capturing device according to any one of claims 1 to 6, wherein the eye detection unit outputs an image in which it is determined that the eye is captured. 8. A guiding unit that guides the subject to place an eye position within a photographing range and a focusing range of the eye photographing unit. The eye image photographing device according to any one of the above. The eye image capturing device according to any one of claims 1 to 8,
A living body discriminating apparatus comprising: a living body discriminating unit that discriminates that the subject is not a living body when there is no difference in pupil size among the plurality of images photographed by the eye photographing unit. The eye image capturing device according to any one of claims 1 to 8,
An authentication information creating unit for creating a plurality of authentication information from each of a plurality of images including at least eyes of the subject photographed by the eye photographing unit;
A collation unit that compares and collates pre-registered registration authentication information and the plurality of authentication information created by the authentication information creation unit;
If it is determined that the registered authentication information matches one of the plurality of authentication information created by the authentication information creation unit as a result of comparison and collation by the collation unit, the subject is registered in advance. An authentication apparatus comprising: an authentication unit that authenticates the presence of the authentication unit. The eye image capturing device according to any one of claims 1 to 8,
An authentication information creating unit that creates a plurality of authentication information from each of a plurality of images including at least eyes of the subject photographed by the eye photographing unit;
A registration apparatus comprising: a registration unit that registers the plurality of authentication information created by the authentication information creation unit in a storage unit as registration authentication information. A first step of generating a near vision image that changes over time;
An eye image photographing method comprising: a second step of photographing a plurality of images including at least eyes of a subject in response to the change in the near-field image generated in the first step.

Images