JP2006251983A - Biological discrimination device, authentication device and biological discrimination method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a biological discrimination device, an authentication device and a biological discrimination method, capable of effectively performing biological discrimination even for an imitation having a similar structure as an eye of a living body, such as an artificial eye. <P>SOLUTION: This device comprises a second light source part 8 for emitting a linear light beam to the vicinity of an eye of a person 30 to be authenticated, a pickup part 2 for picking up the eye of the person 30 to which the light beam is emitted by the second light source part 8, and a biological discrimination part 65 for discriminating whether or not the person 30 to be a living body based on the picture in the vicinity of the eye of the person 30 picked up by the pickup part 2. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a living body determination device that determines whether or not a subject is a living body, an authentication device that performs personal authentication of a subject, and a living body determination method that determines whether or not a subject is a living body.

  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.

  The iris authentication method has a problem of so-called “spoofing” in which an unauthorized person can be authenticated as being a pre-registered person by using a printed matter or a photograph on which an iris pattern is printed. It has been pointed out that solving such problems has become an issue.

In order to prevent such “spoofing”, for example, utilizing the fact that the eye of a living body is a substantially spherical body, the LED is placed at a position where the image is reflected in the pupil, and the LED is placed in the pupil. When an image is reflected, it is determined that the subject is an eye of a living body, and when an LED image does not appear in the pupil, a technique for determining that the subject is a counterfeit such as a photograph has been proposed. (For example, refer to Patent Document 2).
Japanese Patent No. 3307936 JP 2000-298727 A

  However, in the above-described technology, although it is possible to perform biometric determination on a planar forgery such as a photograph or a printed matter, the forgery with a structure resembling a living eye such as a fake eye On the other hand, there is a problem that it is difficult to perform biological discrimination.

  The present invention has been made in view of such a problem, and a biometric discrimination apparatus and authentication capable of effectively performing biometric discrimination on a counterfeit having a structure similar to that of a living eye such as a false eye It is an object of the present invention to provide a device and a living body discrimination method.

  The living body discrimination device of the present invention includes a light beam irradiation unit that irradiates a linear light beam near the subject's eye, a shooting unit that images a subject's eye irradiated with the light beam by the light beam irradiation unit, and a shooting unit And a living body discriminating section for discriminating whether or not the subject is a living body based on the image of the subject's eye.

  With such a configuration, whether the subject is a living body using the fact that the living body has a curved surface or a level difference based on an image of the vicinity of the eye irradiated with the linear light beam, which is taken by the imaging unit. Therefore, it is possible to provide a living body determination apparatus that can effectively perform living body determination even for a counterfeit having a structure similar to that of a living eye such as a false eye.

  The biometric discrimination unit includes a high luminance component extraction unit that extracts an image of a high luminance component from the eye image of the subject imaged by the imaging unit, and the biometric discrimination unit is extracted by the high luminance component extraction unit. Further, it may be configured to determine whether or not the subject is a living body based on the image of the high luminance component.

  According to such a configuration, an image of the linear region irradiated by the light beam irradiation unit is further extracted, and the living body determination is performed based on the image, so that the living body determination can be performed more reliably. .

  The biometric discrimination unit includes a discontinuous part detection unit that detects the presence / absence of a discontinuous part from the high luminance component image extracted by the high luminance component extraction part. Based on the result of the presence / absence of the discontinuous part detected by the part, it may be configured to determine that the subject is a living body when it has two or more discontinuous parts.

  According to such a configuration, since a discontinuous portion is detected from the image of the high brightness area and the living body is determined based on the result, the step that the living body has between the eye and the eyelid is used. Biological discrimination can be performed.

  The biometric determination unit includes a distance detection unit that detects the distance between the discontinuous portions detected by the discontinuous portion detection unit, and the biometric determination unit includes the distance detection unit that determines the distance between the discontinuous portions. The configuration may be such that when the change is detected, the subject is determined to be a living body.

  According to such a configuration, it is possible to perform biometric discrimination using the discontinuous portion detected by the discontinuous portion detection unit, that is, the distance between the eye and the eyelid is changed by blinking. A configuration with excellent security can be realized.

  Moreover, the structure which has a slit part which a light beam becomes linear may be sufficient as a light beam irradiation part.

  According to such a configuration, it is possible to realize a living body discrimination device using a simple configuration in which a slit portion is further provided.

  The light beam irradiation unit may include a light beam generation unit that generates a light beam and a drive unit that scans the light beam generation unit in one direction so that the light beam generated by the light beam generation unit is linear. .

  According to such a configuration, a configuration using a laser having a high directivity and various light sources (LED, incandescent lamp, halogen, xenon, etc.) whose directivity is enhanced by adjusting irradiation lens characteristics is possible. is there.

  Furthermore, the light beam irradiation unit emits at least two linear light beams, and the discontinuous part detection unit of the living body determination unit is based on the distance between the high luminance regions generated by the at least two linear light beams. The configuration may be such that a discontinuous portion is detected.

  Even with such a configuration, the living body discrimination device of the present invention can be realized.

  Next, the authentication device of the present invention includes a biometric identification device of the present invention, an authentication information generating unit that generates authentication information from a part including at least an iris image captured by the imaging unit, and a person who has been registered in advance. A registration authentication information storage unit for storing the registration authentication information, a comparison verification unit for comparing and verifying the authentication information created by the authentication information creation unit, and the registration authentication information stored in the registration authentication information storage unit, and a comparison verification unit And an authentication determination unit that determines whether or not the subject can be authenticated based on the result of the comparison and collation.

  According to such a configuration, the subject is a living body using the fact that the living body has a curved surface or a step based on the image of the vicinity of the eye irradiated with the linear light beam, which is taken by the imaging unit. Since it is determined whether or not there is, an authentication device having a biometric discrimination function capable of effectively performing biometric discrimination on a counterfeit having a structure similar to that of a living eye such as a false eye is provided. be able to.

  Next, the living body discrimination method of the present invention includes a first step of irradiating the vicinity of the subject's eye with a linear light beam, a second step of photographing the eye of the subject irradiated with the light beam, And a third step of determining whether or not the subject is a living body based on an image near the eye of the subject photographed in the second step.

  According to such a method, it is determined whether or not the subject is a living body using the fact that the living body has a curved surface or a level difference based on the image of the vicinity of the eye irradiated with the linear light beam. Therefore, it is possible to provide a living body discriminating method capable of effectively discriminating a living body even for a counterfeit having a structure similar to that of a living eye such as a fake eye.

  As described above, according to the present invention, a biometric discrimination device, an authentication device, and a biometric discrimination that can effectively perform biometric discrimination on a counterfeit having a structure similar to that of a living eye such as a false eye. A method can be provided.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

(First embodiment)
First, the authentication device 1 according to the first embodiment of the present invention will be described. FIG. 1 is a block diagram showing the configuration of the authentication device 1 according to the first embodiment of the present invention.

  As shown in FIG. 1, the authentication device 1 according to the first embodiment of the present invention includes a first light source unit 7 that irradiates a relatively wide range of light to the vicinity of the eye of the person 30 to be authenticated, and Second light source unit 8 that emits a linear light beam, guidance unit 31 that guides the person to be authenticated 30 to shoot an eye image, and eye image of the person 30 to be authenticated guided by the guidance unit 31 The image capturing unit 2 that captures the image, the image quality determination of the eye image captured by the image capturing unit 2, and the like, and a process of sending the image determined to be good to the authentication processing unit 17 (hereinafter, this process is referred to as a capture process) From the capture processing unit 3 to be performed, the authentication processing unit 17 that performs iris authentication processing by a predetermined method using the image captured by the capture processing unit 3, and the image that has been captured by the capture processing unit 3 in a method that will be described later. High brightness component image is extracted and high brightness The biometric determination unit 65 for determining whether or not the person to be authenticated 30 is a living body depending on whether or not a discontinuous portion is extracted from the component image, and the authentication of the person to be authenticated 30 from the authentication processing unit 17 An output unit 23 that outputs information indicating the result and information indicating whether or not the person 30 to be authenticated from the biometric determination unit 65 is a living body is provided.

  First, as the first light source unit 7, in order to capture a clear iris image with a good contrast of the eye of the person to be authenticated 30, a near infrared wavelength (about 700) is applied to a relatively wide area including the eye. To a wavelength of about 1000 nm can be used. As an example of the first light source unit 7, it is possible to use an LED array that generates light beams in the near-infrared wavelength region described above.

  Further, as the second light source unit 8, a light source that irradiates a linear light beam extending in the height direction of the person 30 to be authenticated can be used near the eye of the person 30 to be authenticated. . FIG. 2 is a diagram for explaining the second light source unit 8 of the authentication device 1 according to the first embodiment of the present invention. FIG. 2A is a diagram for explaining the arrangement of the second light source unit 8 with respect to the person 30 to be authenticated in the first embodiment of the present invention, and FIG. It is a figure for demonstrating the light ray which the 2nd light source part 8 in 1 embodiment irradiates with respect to the to-be-authenticated person 30. FIG.

  As shown in FIG. 2A, in the authentication device 1 according to the first embodiment of the present invention, the photographing unit 2 is arranged so as to face the eye 50 of the person 30 to be authenticated. Further, it is desirable that the second light source unit 8 is disposed at a position that irradiates the eye 50 obliquely with respect to the eye 50 of the person 30 to be authenticated from the direction of the corner of the eye or the eye. This is because in the authentication device 1 according to the first embodiment of the present invention, a living body is defined as having a step difference between the living eye 50 and the eyelid 51 using a step difference. This is because it is easy to detect this level difference by irradiating light rays from an oblique direction. Further, as shown in FIG. 2B, in the authentication device 1 according to the first embodiment of the present invention, the second light source unit 8 is the person 30 to be authenticated as shown by the shape A of the light source. The shape is such that the subject is irradiated in a linear shape that is long in the height direction of the subject. In fact, when the subject 30 is irradiated, the eye 50 and the eyelid 51 are discontinuous. A curved high-intensity region B will be exhibited. Here, when the vicinity of the eye 50 of the person 30 to be authenticated is irradiated with the second light source unit 8, the reason why the high-intensity region B near the eye 50 is curved is as shown in FIG. Since the eye 50 and the eyelid 51 of the person 30 to be authenticated are both curved surfaces, the shape of the portion that is brightly illuminated by the irradiation of the second light source unit 8 becomes a curve when irradiated from a diagonal direction with a linear light beam, In addition, the high-luminance region near the eye 50 is discontinuous on the eye 50 and the eyelid 51 as shown in FIG. 2B, because there is a step between the surface of the eye 50 and the surface of the eyelid 51. This is because the distance from the second light source unit 8 to the surface on which the light beam irradiated is different between the eye 50 and the eyelid 51.

  As the second light source unit 8 in the first embodiment of the present invention, not only the near infrared wavelength but also a light source that irradiates light of any wavelength can be used. It is desirable to use a light source that does not feel glare and that can irradiate the eye 50 with light in a safe wavelength region. In the first embodiment of the present invention, a linear light beam (light beam shape A) as shown in FIG. 2B is irradiated on the front surface of an LED capable of irradiating a light beam having a near-infrared wavelength. The light source in which the slit is arranged was used as the second light source unit 8 so as to be able to do so. In the first embodiment, the slit width of the second light source unit 8 is about 2 mm. As the light source, an LED capable of irradiating the above-mentioned near-infrared wavelength light is used, and the light passing through the slit is transmitted. An LED having a condensing lens was used so as not to diverge as much as possible. In the first embodiment of the present invention, the example in which the light beam shape A of the second light source unit 8 is a substantially linear shape has been shown, but the present invention is not limited to this shape. The shape of the light beam of the second light source unit 8 may be, for example, a curved shape or a rectangular shape, and if the shape of the light source is such that a step between the eye 50 and the eyelid 51 can be detected, Needless to say, it is included in the biometric device and authentication device of the present invention.

  As an example of the photographing unit 2 in the first embodiment of the present invention, a black and white camera using a CCD as an image sensor can be used. As a lens system attached to the photographing unit 2 in the authentication device 1 according to the first embodiment of the present invention, a telephoto lens that can magnify and photograph the area of the eye 50 of the person 30 to be authenticated is used. desirable. In the authentication device 1 according to the first embodiment of the present invention, the to-be-authenticated person 30 positions either the left or right eye 50 within the angle of view of the lens system of the photographing unit 2, thereby An eye image is taken for and authentication processing can be performed.

  The guiding unit 31 may have a configuration that includes a display unit such as a liquid crystal display or a sound generation unit such as a speaker and prompts the person to be authenticated 30 to start authentication processing or guide the position. In addition to this, the guiding unit 31 may be configured to guide the position of the person 30 to be authenticated using a mirror unit.

  As the output unit 23, for example, a known display device using liquid crystal, EL, or the like can be used, a device such as a speaker that can notify the authentication result 30 to the person to be authenticated 30 by voice, or an external device It is possible to use various communication devices that can transmit information such as authentication results to devices connected to the. A device such as a display device or a speaker in the output unit 23 can be shared with that of the guide unit 31 or can be provided in each of the output unit 23 and the guide unit 31.

  In the authentication device 1 according to the first embodiment of the present invention, the capture processing unit 3 outputs the image quality determination unit 9 that determines the image quality of the image output from the imaging unit 2 and the imaging unit 2. An eye detection unit 10 that determines whether or not a circular object that is regarded as an iris or pupil of the eye 50 is captured in the image.

  The image quality determination in the image quality determination unit 9 is performed, for example, by analyzing the frequency of an image by using the fact that a sharp image with good image quality has a large amount of information of a predetermined high frequency component, and calculating the information amount of the predetermined high frequency component. A method of determining that the image quality is better as the integrated value increases can be used, but is not limited to this method. For example, using the average luminance information of the entire image, a method for determining that the image quality is good when the average luminance is within a predetermined threshold range, various other known image quality evaluation methods, or a combination thereof The method can be used.

  The eye detection unit 10 determines whether or not a circular object such as an iris or a pupil is photographed from the eye images determined to have good image quality by the image quality determination unit 9. As a determination method in the eye detection unit 10, for example, in an eye image captured by the imaging unit 2, a round region estimated to be a pupil or a black eye portion (for example, a region that is round and has a lower luminance than the surroundings). A pattern matching process between an eye image and an image having a low-luminance area of a predetermined size, or a circle of a circle having a predetermined radius centered on the center coordinates of pupil candidates A method can be used in which an integrated value of luminance on the circumference is obtained, and when the amount of change with respect to the radius of the integrated value is within a predetermined threshold, the pupil candidate is determined to be a pupil.

  The authentication processing unit 17 uses a predetermined method from the iris detection unit 11 that detects the iris part of the eye 50 from the image output from the capture processing unit 3, and the iris part image detected by the iris detection unit 11. Authentication information creating unit 19 for creating authentication information, storage unit 21 storing registration authentication information of a person who has been registered in advance, and registration authentication information stored in storage unit 21 and authentication information creating unit 19 A verification unit 20 that compares and verifies authentication information, and an authentication result determination unit 22 that determines whether or not the person 30 to be authenticated is a person registered in advance based on the comparison and verification result of the verification unit 20.

  The authentication result determination unit 22 outputs information indicating the authentication result, that is, information indicating “authentication possible” to the output unit 23 when it is determined that the person 30 to be authenticated is a person registered in advance. If the certifier 30 is not a registered person, information indicating “authentication impossible” is output to the output unit 23.

  Each component of the authentication processing unit 17, that is, an iris detection method in the iris detection unit 11, an authentication information creation method in the authentication information creation unit 19, a verification method in the verification unit 20, and an authentication result determination unit For example, the method described in Patent Document 1 can be used as the determination method of the authentication result in 22, but the present invention is not limited to this method, and the function of the authentication processing unit 17 is the iris or retina. Alternatively, it can be realized by using other known biometric authentication processing blocks such as facial feature points.

  The biometric determination unit 65 according to the first embodiment of the present invention extracts a high-luminance component extraction unit that extracts a high-luminance portion from the eye image of the person to be authenticated 30 output from the eye detection unit 10 of the capture processing unit 3. 62, a discontinuous portion detector 63 for detecting whether or not a discontinuous portion exists in the high-luminance portion of the eye image extracted by the high-luminance component extractor 62, and a discontinuous portion detector 63 However, if it is determined that there are two or more discontinuous portions in the high-luminance portion in the eye image, it is determined that the person to be authenticated 30 is a living body, while the discontinuous portion detection unit 63 detects the eye image. When it is determined that there is no discontinuous portion or only one discontinuous portion in the high-brightness portion, the living body determination unit 64 determines that the person to be authenticated 30 is not a living body. .

  Here, the function of the living body determination unit 65 in the first embodiment of the present invention will be described in more detail. FIG. 3 is a diagram for explaining the function of the biometric determination unit 65 of the authentication device 1 according to the first embodiment of the present invention.

  First, as shown in FIG. 3A, it is assumed that an eye image 55 in which an eye 50 is detected in an image is output from the eye detection unit 10 of the capture processing unit 3. Here, it is assumed that the eye image 55 is an image of the vicinity of the eye 50 of the living body. The high luminance component extraction unit 62 of the living body determination unit 65 extracts an image of the high luminance region 56 generated by the irradiation of the second light source unit 8 from the eye image 55 and sends the image to the discontinuous portion detection unit 63. FIG. 3B is a diagram illustrating an example of an image of the high luminance region 56 extracted by the high luminance component extraction unit 62 from the eye image 55 illustrated in FIG. The image of the high luminance area 56 as shown in FIG. 3B is sent from the high luminance component extracting unit 62 to the discontinuous part detecting unit 63, and the discontinuous part detecting unit 63 The image is differentiated in the vertical direction (C direction) toward the eye 50 in FIG. The direction in which the differentiation process is performed may be the same as the direction in which the line of the linear light beam irradiated by the second light source unit 8 extends. FIG. 3C shows the result of the differentiation process performed by the discontinuous portion detection unit 63. As shown in FIG. 3C, it can be seen that peaks are generated in the two regions shown in the region D as a result of the differentiation processing in the discontinuous portion detection unit 63. This peak corresponds to the two discontinuous points F in the high luminance region 56 in FIG. As shown in FIG. 3C, whether or not a peak has occurred is determined when a threshold E is provided and the result of differentiating the image of the high brightness area 56 varies beyond a predetermined threshold E. Therefore, it can be determined that a peak exists, that is, the discontinuous point F exists in the high luminance area 56 in the eye image 55. In addition, the number of regions that fluctuate beyond a predetermined threshold E corresponds to the number of discontinuous points F in the high luminance region 56 in the eye image 55. In the example shown in FIG. 3C, since the number of peak regions D exceeding the threshold E is two, the number of discontinuous points is two. As described above, according to the discontinuous portion detection unit 63 in the first embodiment of the present invention, the high luminance region 56 in the eye image 55, that is, the region that is brightened by the irradiation of the second light source unit 8. It is possible to detect whether or not the discontinuous point F exists and the number of the discontinuous points F.

  Based on the output from the discontinuous part detection unit 63, the biometric determination unit 64 determines that the person to be authenticated 30 is a living eye when the number of discontinuous points in the high-luminance region 56 in the eye image 55 is at least two. On the other hand, if the discontinuous point of the high brightness area 56 in the eye image 55 does not exist or is one, the person 30 to be authenticated is not the living eye 50, that is, forgery. Judge that it is a thing. In the living eye 50, as described above, there are at least two steps between the eyelid 51 and the eye 50, between the upper eyelid and the eye 50, and between the lower eyelid and the eye 50. Therefore, since it is assumed that at least two or more discontinuous points F exist in the high luminance region 56 generated by the light beam emitted from the second light source unit 8, in the first embodiment of the present invention. The biometric determination unit 64 of the authentication device 1 determines that the person to be authenticated 30 is a biometric when the number of discontinuous points of the high luminance area 56 in the eye image 55 is two or more.

  On the other hand, for example, a case where the subject is a forgery 60 provided by an unauthorized person who tries to impersonate will be described. FIG. 4 is a diagram for explaining an image when the forgery 60 is photographed in the authentication device 1 according to the first embodiment of the present invention.

  As shown in FIG. 4, for example, it is assumed that an unauthorized person uses a photograph taken of an iris pattern of a person registered in advance as the forgery 60. When such a forgery 60 is used, when the illumination shape 58 is linear in the second light source unit 8, a linear high brightness similar to the illumination shape 58 is formed on the forgery 60. A region 61 appears and is photographed by the photographing unit 2. When such an image is processed by the living body discriminating unit 65, a linear high luminance region 61 is extracted by the high luminance component extracting unit 62, but in the discontinuous portion detecting unit 63, the high luminance region 61 is extracted. Is determined not to have a discontinuous region. Therefore, since the living body determination unit 64 determines that the subject is not a living body, an unauthorized person can use the forgery 60 of the photograph in which the iris pattern of the registered person is photographed as a result of the living body determination. It is determined that it is not a living body.

  Further, in the example of the counterfeit 60 shown in FIG. 4, for example, when an unauthorized person bends a photograph of the counterfeit 60, considering that the eye 50 of the living body is a sphere. The light from the second light source unit 8 is photographed by the photographing unit 2 as a curved high-intensity region 59. Even in such a case, since the discontinuous portion detection unit 63 determines that the discontinuous portion does not exist in the high luminance region 59, the living body determination unit 64 determines that the subject is not a living body. Even if the forgery 60 is bent, it is determined that the living body is not a living body as a result of the living body determination.

  Further, even when a spherical counterfeit such as a fake eye is used, when irradiated with the linear second light source unit 8, the eyelid 51 and the eye 50, which exist in the eye 50 of the living body, are used. Since there is no step between them, the discontinuous part detection unit 63 determines that there is no discontinuous part in the high luminance region, and the living body determination unit 64 determines that the subject is not a living body. Even if false eyes are used, it is determined that it is not a living body, and a highly secure configuration can be realized.

  As described above, when the authentication device 1 according to the first embodiment of the present invention is used, even when an unauthorized person uses a forgery 60 such as a photograph or false eye, the subject is determined not to be a living body. And a highly secure configuration can be realized.

  Next, operation | movement of the authentication apparatus 1 in the 1st Embodiment of this invention is demonstrated.

  FIG. 5 is a flowchart showing operation steps of the authentication device 1 according to the first embodiment of the present invention. As shown in FIG. 5, in the authentication device 1 according to the first embodiment of the present invention, first, the control unit 6 sets the eye 50 of the person 30 to be authenticated to the guide unit 31 and the imaging range of the imaging unit 2. Guidance is made so as to be positioned inside (S1). When a mirror is used as the guiding unit 31, the control unit 6 does not need to give an instruction to the guiding unit 31, and notifies the person to be authenticated 30 that authentication is started. You can just do it.

  Next, the control unit 6 turns on the first light source unit 7 and irradiates the vicinity of the eye 50 of the person 30 to be authenticated (S2). The order of step S1 and step S2 may be either first or may be started simultaneously.

  Next, the control unit 6 turns on the second light source unit 8 and irradiates the vicinity of the eye 50 of the person 30 to be authenticated with a linear light beam (S3).

  In this state, the irradiation of the first light source unit 7 and the irradiation of the second light source unit 8 are performed at the same time. It is desirable that the luminance by the second light source unit 8 be higher than the luminance of the light source unit 7.

  Next, the control unit 6 causes the photographing unit 2 to photograph the eye 50 of the person 30 to be authenticated (S4).

  Next, the control unit 6 causes the capture processing unit 3 to perform the above-described capture processing (S5).

  In step S5, if the image can be captured by the capture processing unit 3, the process proceeds to step S7. If the capture process cannot be performed, the process returns to step S4, and the control unit 6 controls the photographing unit 2. The subject is photographed again (S6).

  In step S <b> 6, when it is determined that the capture processing unit 3 has captured the eye image 55, the high luminance component extraction unit 62 of the living body determination unit 65 extracts the high luminance component from the eye image 55. (S7) The discontinuous part detection unit 63 detects the discontinuous part from the high luminance component image, and determines whether or not there are two or more discontinuous parts in the high luminance component image. (S8).

  If it is determined in step S8 that there are two or more discontinuous portions in the high-luminance component image, the living body determination unit 64 determines that the subject is the eye 50 of the living body (S10). In Step S12, on the other hand, if it is determined in Step S8 that there is no discontinuous portion in the high luminance component image, or there is at least one, the living body determination unit 64 It is determined that the subject is not a living body, and the result is output from the output unit 23 (S9, S11).

  If it is determined in step S9 that the subject is the living eye 50, the iris detection unit 11 detects a portion regarded as an iris from the image sent from the capture processing unit 3, and the authentication information creation unit 19 The authentication information is created by the above, and the comparison and verification process with the registered authentication information stored in the storage unit 21 in the verification unit 20 and the authentication result determination process in the authentication result determination unit 22 are performed (S12).

  If the authentication result by the authentication result determination unit 22 in step S12 is a result that the authenticated person 30 can be authenticated as a previously registered person, the result is output from the output unit 23 to the authenticated person 30. (S13, S14, S16) On the other hand, if the authenticated person 30 is not a pre-registered person and the result indicates that the person cannot be authenticated, the output unit 23 sends the result to the authenticated person 30. Notify (S13, S15, S16).

  As described above, in the authentication device 1 according to the first embodiment of the present invention, by performing the processing from the above-described step S1 to step S16, the first light source unit 7 and the second light source unit 8 Since the biometric discrimination process and the authentication process can be performed using the eye images 55 that are photographed while simultaneously turning on the light, not only the authentication process but also the biometric discrimination process can be performed quickly.

  Note that the method of performing the biometric determination process and the authentication process using the authentication device 1 according to the first embodiment of the present invention is not limited to the method illustrated in FIG. FIG. 6 is a flowchart showing another operation of the authentication device 1 according to the first embodiment of the present invention. In FIG. 6, in order to simplify the description, the same processing steps as those in the flowchart shown in FIG. As shown in FIG. 6, after the guidance by the guidance unit 31 is performed (S1), only the first light source unit 7 is irradiated without performing the irradiation of the second light source unit 8 (S2). Immediately after the capture processing unit 3 captures an authentication-capable image (S6), the first light source unit 7 is turned off and the second light source unit 8 starts irradiation (S3). An eye image 55 is taken (S20). Thereafter, authentication processing (S12) is performed using the eye image 55 photographed in a state where the first light source unit 7 is irradiated. As a result, when it is determined that the subject is a registrant (S14), A method of performing living body determination (S7 to S11) using an eye image 55 photographed in a state where the second light source unit 8 is irradiated is also possible. According to the method shown in FIG. 6, when performing the authentication process, the photographed eye image 55 does not include the linear high-luminance generation region by the second light source unit 8, so that the authentication is performed more reliably. Processing can be performed. In addition, immediately after the eye image 55 for authentication processing is captured in the state irradiated by the first light source unit 7, the eye image 55 for biometric determination is captured in the state irradiated by the second light source unit 8. This is to reduce the time difference between when the eye image 55 for authentication processing and the eye image 55 for biometric discrimination are photographed, and to reduce the possibility of fraudulent impersonation.

  As described above, according to the authentication device 1 in the first embodiment of the present invention, it is determined whether or not the person 30 to be authenticated is a living body using the highly reliable iris authentication method. In addition, a higher security configuration can be realized by performing biometric discrimination based on whether or not there is a discontinuity in a portion of a high-luminance region of an image captured in the vicinity of the eye 50. It becomes possible to do.

  In the first embodiment of the present invention, as an example of the configuration of the second light source unit 8, a slit is formed on the front surface of an LED having a condensing lens to irradiate linear rays. However, the present invention is not limited to this configuration. For example, by using a light source having a small aperture such as a laser and driving the light source to scan in a predetermined direction (for example, the height direction of the person 30 to be authenticated), a line near the eye can be obtained. Can be irradiated.

  Further, in the first embodiment of the present invention, as a function of the discontinuous part detection unit 63 of the living body determination unit 65, a single linear ray as shown in FIG. The function of detecting discontinuous points by differentiating the image of the high luminance region 56 extracted by the high luminance component extraction unit 62 from the eye image 55 photographed in this way in a predetermined direction (line direction of a linear ray). However, the discontinuous portion detection unit of the present invention is not limited to this function.

  FIG. 7 is a diagram for explaining another function of the discontinuous portion detection unit 63 of the authentication device 1 according to the first embodiment of the present invention.

  For example, when a light source is used as the second light source unit 8 such that two linear light beams are irradiated in the vicinity of the eye 50 (for example, two slits are formed on the front surface of the LED). The high brightness component extraction unit 62 extracts two high brightness areas 71 from the eye image. At this time, the discontinuous portion detection unit 63 does not simply differentiate the image of the high brightness area 71 but measures the distance between the two lines of the image of the high brightness area 71 to obtain the inter-pixel distance 72. Is calculated. The discontinuous portion detection unit 63 can also calculate the differential value 73 by differentiating the change in the value of the inter-pixel distance 72 in the linear direction of the linear light beam. If the threshold value is changed beyond a predetermined threshold value, it can be determined that a discontinuous point exists.

(Second Embodiment)
Next, the configuration of the authentication device 101 according to the second embodiment of the present invention will be described. In the authentication device 101 according to the second embodiment of the present invention, the living eye 50 has a step between the eye 50 and the eyelid 51 as in the authentication device 1 described in the first embodiment. The living body is discriminated using the fact that the living body blinks, that is, the eyelid 51 is opened and closed. The opening and closing of the eyelid means that the distance between each of the two steps of the eye 50 and the eyelid 51 changes, and this phenomenon is used to perform authentication in the second embodiment of the present invention. The apparatus 101 determines whether the subject is a living body.

  FIG. 8 is a block diagram showing the configuration of the authentication device 101 according to the second embodiment of the present invention. The authentication apparatus 101 according to the second embodiment of the present invention is different from the authentication apparatus 1 according to the first embodiment in that the biometric determination unit 83 is between discontinuous points detected by the discontinuous part detection unit 63. This is a point having a distance detector 81 for measuring the distance. Other constituent elements are similar to the constituent elements of the authentication device 1 already described in the first embodiment, and thus description thereof is omitted.

  FIG. 9 is a diagram for explaining the function of the distance detection unit 81 of the authentication device 101 according to the second embodiment of the present invention.

  Since the eye 50 of the living body normally blinks, when the eye 50 is continuously photographed, the eye image 91 in the state as shown in FIG. 9A and the eye image 91 shown in FIG. The eye image 92 in such a state, that is, an image in which the eyes 50 are opened differently is taken. The authentication apparatus 101 in the second embodiment of the present invention uses this phenomenon.

  In the authentication device 101 according to the second embodiment of the present invention, the eye image 91 is output from the eye detection unit 10, and the high luminance component extraction unit 62 extracts an image of a linear high luminance region from the eye image 91. A discontinuous point is extracted from the image of the high brightness region by the discontinuous portion detecting unit 63 performing differentiation. The steps so far are the same as those of the authentication device 1 in the first embodiment. In the authentication device 101 according to the second embodiment of the present invention, the distance between the discontinuous points is further set to a predetermined time (for example, several seconds) with respect to the differential value 93 output from the discontinuous portion detection unit 63. ) Continuously detect. When the distances D1 and D2 change, the living body determination unit 82 determines that the subject is a living body, and when the distance between the discontinuous points does not continuously change, the subject may not blink. Therefore, it is determined that the subject is not a living body, and the result is output to the output unit 23.

  With this configuration, according to the authentication device 101 in the second embodiment of the present invention, when there are two or more steps around the living eye 50 and the distance between the steps changes. In addition, since it is determined that the subject is a living body, for example, even if a three-dimensional counterfeit such as a fake eye put on the face of a doll is used, it is determined that the subject is not a living body. A high configuration can be realized.

  FIG. 10 is a flowchart showing operation steps of the authentication device 101 according to the second embodiment of the present invention. In FIG. 10, for the sake of simplicity, the same reference numerals are given to the same processing steps as those in the flowcharts shown in FIGS. 5 and 6 described in the first embodiment, and the description thereof is omitted. To do.

  The authentication apparatus 101 according to the second embodiment of the present invention determines whether or not there are two or more discontinuous portions in the image of the high luminance area in step S9 (S9), and then the distance. The detection unit 81 continuously detects the distance between discontinuous parts (S30). As a result, when the distance detection unit 81 determines that the distance between the discontinuous portions has changed, the biometric determination unit 82 determines that the person to be authenticated 30 is a living body, and after step S12 On the other hand, when it is determined that the distance between the discontinuous portions has not changed (S10), the biometric determination unit 82 determines that the person 30 to be authenticated is not a living body (S31). , S11).

  Note that, in the authentication device 101 according to the second embodiment of the present invention as well as the authentication device 1 according to the first embodiment, the first light source unit 7 and the second light source unit 7 as shown in FIG. A method of using an eye image captured in a state where both the light sources 8 are irradiated for authentication processing and biometric discrimination processing can be performed, and after guidance by the guidance unit 31 is performed as shown in FIG. ), The second light source unit 8 is not irradiated, but only the first light source unit 7 is irradiated (S2), an eye image is taken (S4), and the eye image for authentication processing is captured. Immediately after being captured by the unit 3 (S6), the first light source unit 7 is turned off and the irradiation of the second light source unit 8 is started (S3), and an eye image for biometric discrimination is newly taken ( S20) While being used for the biometric discrimination process, the image is taken in step S4. Eye image for authentication treatment, it is also possible to store in the recording unit of the authentication apparatus 101 (not shown). In such a method, the biometric discrimination eye image captured in a state in which the second light source unit 8 is irradiated is a predetermined number (for example, several) necessary for calculating the time change in the distance detection unit 81. (S20, S21), for each eye image, high luminance component extraction processing (S7) by the high luminance component extraction unit 62, and discontinuous portion calculation processing by the discontinuous portion detection unit 63 (S8) and the discontinuous portion determination process (S9) are performed, and the distance detection unit 81 uses the eye images captured for the biometric determination processing to perform discontinuous in the high-luminance component image. The distance of the part (corresponding to the distance between the eyelids 51) is calculated (S30), and it is determined whether or not the distance changes with time (S31).

  If it is determined in step S21 that a predetermined number of eye images for biometric determination processing have not been taken, the example shown in FIG. 10 shows an example of returning to step S3. It is also possible to return to the process of re-taking the eye image for authentication processing again.

  In step S31, when it is determined that the subject is a living body because the distance between the discontinuous portions in the high-luminance region has changed (S10), the first stored in the storage unit is stored in step S4. A method of determining whether or not the person to be authenticated is a person who has been registered in advance using the eye image photographed in a state where the light source unit 1 is irradiated (S12 to S16). Can be used.

  If it is determined in step S21 that a predetermined number of biometric discrimination eye images have not been taken, the process returns to the authentication eye image taking in step S2. Performing the authentication process to be performed on the last eye image photographed in the state of irradiation of the first light source unit 7 reduces the time difference from the time of photographing the eye image for the biometric discrimination process. Although it is desirable from the viewpoint of preventing impersonation, there is no problem in practical use even if any of the plurality of eye images for authentication processing that are taken is used for authentication processing determination.

  According to the method as shown in FIG. 10, when performing the authentication process, the newly photographed eye image does not include a linear high-luminance generation region by the second light source unit 8. The authentication process can be reliably performed as in the authentication device 1 in the first embodiment.

  The authentication apparatus 1 and the authentication apparatus 101 in the embodiment of the present invention have been described as performing the iris authentication process, but the authentication apparatus of the present invention is limited to the authentication process method. is not. For example, it goes without saying that biometric authentication methods such as retina authentication and face authentication can be used as appropriate.

  As described above, according to the present invention, it has an excellent effect that it is possible to effectively perform biometric discrimination against a counterfeit having a structure similar to that of a living eye such as a false eye. Is useful as a biometric discrimination device that discriminates whether or not a subject is a living body, an authentication device that performs personal authentication of a subject, a biometric discrimination method that discriminates whether or not a subject is a living subject, and the like.

The block diagram which shows the structure of the authentication apparatus in the 1st Embodiment of this invention. The figure for demonstrating the 2nd light source part of the authentication apparatus in the 1st Embodiment of this invention. The figure for demonstrating the function of the biometric discrimination | determination part of the authentication apparatus in the 1st Embodiment of this invention. The figure for demonstrating the image at the time of image | photographing a forgery in the authentication apparatus in the 1st Embodiment of this invention. The flowchart which shows the operation | movement step of the authentication apparatus in the 1st Embodiment of this invention. The flowchart which shows other operation | movement of the authentication apparatus in the 1st Embodiment of this invention. The figure for demonstrating the other function of the discontinuous part detection part of the authentication apparatus in the 1st Embodiment of this invention. The block diagram which shows the structure of the authentication apparatus in the 2nd Embodiment of this invention. The figure for demonstrating the function of the distance detection part of the authentication apparatus in the 2nd Embodiment of this invention. The flowchart which shows the operation | movement step of the authentication apparatus in the 2nd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,101 Authentication apparatus 2 Imaging | photography part 3 Capture process part 6 Control part 7 1st light source part 8 2nd light source part 9 Image quality determination part 10 Eye detection part 11 Iris detection part 17 Authentication process part 19 Authentication information creation part 20 Verification Unit 21 Storage unit 22 Authentication result determination unit 23 Output unit 30 Person to be authenticated 31 Guide unit 50 Eye 51 Eyelid 55, 91, 92 Eye image 56, 59, 61, 71 High brightness area 58 Illumination shape 60 Counterfeit 62 High brightness Component extraction unit 63 Discontinuous part detection unit 64, 82 Living body determination unit 65, 83 Living body determination unit 72 Distance between pixels 73, 93 Differential value 81 Distance detection unit

Claims (9)

A light irradiation unit that irradiates the vicinity of the subject's eye with a linear light beam;
A photographing unit that photographs the eye of the subject irradiated with light by the light irradiation unit;
A living body discriminating apparatus comprising: a living body discriminating unit that discriminates whether or not the subject is a living body based on an image near the eye of the subject photographed by the photographing unit. The biometric determination unit includes a high luminance component extraction unit that extracts an image of a high luminance component from the eye image of the subject imaged by the imaging unit,
The biometric discrimination device according to claim 1, wherein the biometric discrimination unit discriminates whether or not the subject is a living body based on the image of the high luminance component extracted by the high luminance component extraction unit. . The living body discrimination unit has a discontinuous part detection unit that detects the presence or absence of a discontinuous part from the image of the high luminance component extracted by the high luminance component extraction unit,
The living body discriminating unit discriminates that the subject is a living body when it has two or more discontinuous parts based on the result of the presence or absence of the discontinuous parts detected by the discontinuous part detecting unit. The living body discrimination apparatus according to claim 2. The living body determination unit includes a distance detection unit that detects a distance between discontinuous parts detected by the discontinuous part detection unit,
The said living body discrimination | determination part discriminate | determines that the said to-be-photographed object is a biological body, when the said distance detection part detects that the distance between the said discontinuous parts changed. Biological discrimination device. The living body discrimination apparatus according to any one of claims 1 to 4, wherein the light beam irradiation unit includes a slit portion that makes the light beam linear. The light beam irradiating unit generates a light beam, and
5. The driving device according to claim 1, further comprising: a driving unit configured to scan the light beam generating unit in one direction so that the light beam generated by the light beam generating unit is linear. 6. Biological discrimination device. The light beam irradiation unit irradiates at least two linear light beams,
The discontinuous portion detection unit of the biometric determination unit detects the discontinuous portion based on a distance between high-intensity regions generated by the at least two linear rays. The living body discrimination device according to any one of claims 3 to 6. The living body discrimination device according to any one of claims 1 to 7,
An authentication information creating unit that creates authentication information from a portion including at least an iris of an image photographed by the photographing unit;
A registration authentication information storage unit that stores registration authentication information of a person registered in advance;
A comparison verification unit that compares and verifies the authentication information created by the authentication information creation unit and the registration authentication information stored in the registration authentication information storage unit;
An authentication apparatus comprising: an authentication determination unit that determines whether or not the subject can be authenticated based on a result of comparison and collation in the comparison and collation unit. A first step of irradiating a line of light near the subject's eye;
A second step of photographing the eye of the subject irradiated with light;
And a third step of determining whether or not the subject is a living body based on an image near the eye of the subject photographed in the second step.

Images