JP2015001843A - Biometric authentication device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a biometric authentication device that detects appropriate placement of a living organism without fail, and induces so as to be the appropriate placement when inappropriately placed.SOLUTION: A position guide and a marking 280 indicative of the position where a living organism 290 is placed are provided at a position where the living organism is placed, and sensors (touch sensors) 241 to 244 are provided that detect placement of the living organism, and then, whether or not the placement is appropriate is detected. As a result of the detection, when it is determined that the placement is appropriate, a registration of the living organism or authentication thereof is executed.

Description

  The present invention relates to a biometric authentication device.

  Conventionally, passwords have been widely used for authentication of magnetic cards and IC cards. In recent years, biometric authentication using a part of an individual's body as a key, such as a fingerprint, an iris, or a blood vessel pattern, has attracted attention as a security method that is less likely to be illegally exercised due to loss or theft. Among them, the authentication method using a blood vessel pattern has little psychological resistance because it does not associate a criminal investigation like a fingerprint or irradiates light directly on an eye like an iris. There is an advantage that counterfeiting is difficult because of the internal characteristics rather than the observable biological surface.

  These biometric authentications are becoming widespread in personal authentication of automatic machines of financial institutions. In particular, finger vein authentication devices using finger veins are in the spotlight from the viewpoint of ease of use and easy authentication.

  When performing personal authentication in the biometric authentication device, one of the factors that cause the person to be rejected by mistake is that the person is not properly placed.

  For example, in Patent Document 1, the finger placement is correctly guided using an image captured by a side camera.

JP 2009-178300 A

  Since the conventional finger vein authentication device has a degree of freedom in how to place the finger, if the finger placement at the time of finger registration and authentication is greatly different, the authentication rate will be lowered. In addition, when the finger is placed strongly, blood flow stops, and the vein pattern may not be acquired correctly.

  About a biometrics authentication apparatus, it has a subject in inducing to a test subject so that it may become a proper way of placing a living body, and avoiding the way of placing where blood flow stops.

  As an example, the biometric authentication apparatus according to the present invention extracts a blood vessel pattern from a light source, an imaging unit that images light from the light source that has passed through a biological part, and an image captured by the imaging unit, and registers the extracted blood vessel pattern as a biometric registration pattern. , A processing unit that performs personal authentication using the biometric registration pattern, a guide unit that indicates the arrangement of the biological body part, and a first part that is located in an area inside the guide part and corresponds to the tip of the imaging range of the biological body part The living body detection unit and the second living body detection unit corresponding to the right side of the imaging range of the living body part, located in the inner region of the guide unit, and the inner region of the guide unit, the living body A third living body detection unit corresponding to the left side surface of the imaging range of the part and an area inside the guide unit, opposite to the first biological detection unit in the major axis direction of the imaging range of the biological part At the end of the side When the first biological detection unit, the second biological detection unit, and the third biological detection unit detect contact of the biological part, The biometric registration pattern is registered, and personal authentication of the biometric registration pattern is performed. Here, the apparatus further includes a fourth living body detection unit provided in the gap, and the processing unit includes the first biological detection unit, the second biological detection unit, and the third biological detection unit. Detecting the contact of the living body part and the fourth living body detecting unit does not detect the contact of the living body part, registering the biometric registration pattern and performing personal authentication of the biometric registration pattern Good.

  It is possible to reliably detect the case where the living body is properly placed, and to reduce the rejection of the person due to the wrong placement. In addition, when it is determined that the placement is inappropriate, the biometric registration and authentication can be interrupted so that the placement can be guided appropriately.

Device configuration diagram External view of the device Vertical section of the device Device cross-sectional view Diagram explaining how to place Diagram explaining how to place The figure explaining detection of compression of a living body Vertical section of the device Device cross-sectional view

  An embodiment according to the present invention will be described with reference to FIGS.

  The configuration of the biometric authentication device in this embodiment will be described. FIG. 1 is a configuration diagram of a biometric authentication device 100 according to the present embodiment, and includes an imaging unit 120, a light source unit 130, a first biological detection unit 141, a second biological detection unit 142, a third biological detection unit 143, A fourth living body detection unit 144, a communication unit 150, and a control unit 110 are included. In addition, the biometric authentication device 100 is connected to the upper terminal 170 via the communication unit 150.

  The control unit 110 controls each part of the biometric authentication device 100, and contacts the living body with the first biological detection unit, the second biological detection unit, the third biological detection unit, and the fourth biological detection unit. In the case of determining whether or not the living body is placed in an appropriate manner and determining that the living body is placed correctly, the light amount of the light source unit 130 is adjusted to a state suitable for imaging of the living body. Then, the living body is imaged by the imaging unit 120, a blood vessel pattern serving as characteristic information at the time of personal authentication is extracted from the acquired biological image, and the extracted blood vessel pattern is converted into a data format suitable for verification for personal authentication. Then, this is output as biometric registration data to the upper terminal 170 via the communication unit 150 (registration processing).

  In addition, the control unit 110 detects the presence or absence of contact with a living body by the first living body detecting unit, the second living body detecting unit, the third living body detecting unit, and the fourth living body detecting unit, so that the living body is properly placed. If it is determined that the light source is placed correctly, the light amount of the light source unit 130 is adjusted to a state suitable for imaging the living body, and then the living body is imaged by the imaging unit 120 and acquired. A blood vessel pattern serving as characteristic information at the time of personal authentication is extracted from the obtained biometric image, and the degree of coincidence is calculated by comparing the obtained biometric registration pattern with a pre-registered biometric registration pattern. Depending on whether or not the threshold value is exceeded, identity authentication is performed, and the authentication result is output to the upper terminal 170 via the communication unit 150 (authentication process).

  FIG. 2A is an external view of a position guide and marking for placing a living body in the biometric authentication apparatus according to the present embodiment. FIG. 2B is a top view of the biometric authentication apparatus according to the second embodiment, which is a position guide for placing a living body and a marking showing a position for placing a living body.

  The biometric authentication device 200 is provided with a bank-shaped guide 270 that is inclined so as to surround the living body part so that the living body part is placed. It can be guided to the placement. Further, the top of the guide 280 may be provided with a marking 280 for visually indicating that the living body part is placed as shown in the figure. This is a color different from that around the authentication device, and visually indicates that the living body is placed.

  In addition, the biometric authentication device 200 performs imaging of the biological information of the biological part 290 by the imaging unit 220.

  The first living body detecting unit 241, the second living body detecting unit 242, the third living body detecting unit 243, and the fourth living body detecting unit 244 detect presence / absence of contact of the living body and determine how to place the living body. . The first living body detecting unit 241, the second living body detecting unit 242, the third living body detecting unit 243, and the fourth living body detecting unit 244 are arranged in the area inside the guide 270 and the marking 280. It is possible to determine the proper placement of the living body part. In addition, the second living body detection unit 242 and the third living body detection unit 243 are arranged on the inclined slope of the inclined bank-shaped guide so as to be in contact with the side surface of the living body part.

  With the above configuration, the degree of freedom of movement of the living body when the living body is placed is restricted and guided to an appropriate placing method at the same time, and at the same time, the proper placement of the living body part can be determined. Moreover, when using marking further, the position which places a biological body on a user can be shown visually.

  The arrangement of the biometric authentication device in this embodiment will be described with reference to FIGS.

  FIG. 3 is a longitudinal sectional view of the biometric authentication device 300 according to the present embodiment, and includes an imaging unit 320, a light source unit 330, a first biometric detection unit 341, a second biometric detection unit 342, and a third biometric detection unit 343. The fourth living body detection unit 344 is arranged to detect living body information of the living body part 390.

  The imaging unit 320 is in a position for imaging the central front surface (abdominal side of the finger) of the living body part 390. The light source unit 330 irradiates near-infrared light from the back side of the living body part 390 (back side of the finger) toward the range where the living body part is imaged.

  The first living body detection unit 341 is located at a position corresponding to the front side of the imaging range of the living body part 390. When it is detected that the living body part is touching, it is determined that the placement is appropriate. When it is detected that the living body part is not touching, it is determined that the placement is inappropriate.

  The second living body detection unit 342 and the third living body detection unit 343 are located at positions corresponding to the left and right side surfaces (side surfaces on the stomach side of the finger) of the imaging range of the living body part 390. The second living body detection unit 342 is in a position where the left side surface is touched, and the third living body detection unit 343 is in a position where the other side right side surface is touched. When it is detected that the living body part is touching, it is determined that the placement is appropriate. When it is detected that the living body part is not touching, it is determined that the placement is inappropriate.

The fourth living body detection unit 344 is located at the front side position on the base side of the imaging range of the living body part 390, that is, at the end opposite to the first living body detection unit 1 in the major axis direction of the imaging range of the living body part 390. Since this part becomes a position where blood flow is blocked by the pressure, it is determined that the placement is appropriate when it is detected that the living body part is not touched, and the living body is compressed when it is detected that it is touched. It is determined that the placement is inappropriate.
In addition, as a living body detection means in the living body detection units 341 to 344, an electrostatic sensor (touch sensor) that detects the presence or absence of an object based on a change in capacitance can be used. Alternatively, it may be a mechanical switch that switches ON / OFF by touching an object, or another switch.

  FIG. 4 is a cross-sectional view of the biometric authentication device 400 according to this embodiment. The imaging unit 420, the light source unit 430, the second biometric detection unit 442, the third biometric detection unit 443, and the fourth biometric detection unit 444 are illustrated. Is arranged to detect biological information of the biological part 490. In FIG. 4, the first living body detection unit is omitted.

  The imaging unit 420 is in a position to image the central front surface (abdominal side of the finger) of the living body part 490.

  The light source unit 430 irradiates near-infrared light from the back side of the living body part 490 (back side of the finger) to the range where the living body part is imaged.

  The second living body detection unit 442 and the third living body detection unit 443 are in positions where the left and right side surfaces (side surfaces of the finger on the abdomen side) of the imaging region of the living body part 490 touch. The second living body detection unit 442 touches the left side surface, and the third living body detection unit 443 touches the other side right side surface. The second living body detection unit 442 and the third living body detection unit 443 detect that the left and right side surfaces of the living body part 490 are touching, but are appropriate when detecting that both the left and right sides are touching. It is determined that the position is placed.

  The fourth living body detection unit 444 is located at the front side position on the base side of the imaging range of the living body part 490, that is, at the end opposite to the first living body detection unit 1 in the major axis direction of the imaging range of the living body part 390. Since this part becomes a position where blood flow is hindered by the compression of the living body, when it is detected that the living body part is not touching, it is determined that the placement is appropriate. Is determined to be inappropriate. The fourth living body detection unit 444 is installed in the gap 1000 in the area inside the guide 270. For example, as shown in the drawing, the biometric authentication device 400 is provided as a concave region protruding toward the bottom surface. Thereby, since the space | gap part 1000 is a shape which does not enter substantially, when the biological body part 490 is contacting with the guide 270 with appropriate pressure, it is not touching the 4th biological body detection part 444. It will be in the state to detect. A method for determining how to place a living body will be described with reference to FIGS. 5, 6, and 7.

  FIG. 5A is a diagram for explaining a state when the living body is properly placed. The first living body detection unit is touched by the front side of the imaging range of the living body part 591 and is determined as “having a living body”. The second living body detection unit and the third living body detection unit are in contact with the left and right side surfaces of the imaging range of the living body part 591, and are determined to have “living body”. The fourth living body detection unit is in a state where the living body part 591 is not touched, and is determined as “no living body”. Since the living body is compressed by touching this part and blood flow is hindered, a state where it is not touched is preferable. With the above state, it can be determined that the living body is properly placed.

  FIG. 5B is a diagram illustrating a state in which only the tip portion of the living body part is touched. Either or both of the second living body detection unit and the third living body detection unit do not touch the living body part 592, and it is determined that there is no living body. In this state, unlike the detection result of FIG. 5 (a), since the placement of the living body is not appropriate, the biometric authentication registration process / authentication process is interrupted and only the tip of the living body is touched. This is notified to the upper terminal, and guidance for making an appropriate placement can be displayed by the upper terminal.

  FIG.5 (c) is a figure explaining the state which only the base part of the biological body part touched. The first living body detection unit does not touch the living body part 593 and it is determined that there is no living body. In this state, unlike the detection result of FIG. 5 (a), since the placement of the living body is not appropriate, the registration process / authentication process of the biometric authentication is interrupted and only the finger base side is touched. This is notified to the upper terminal, and guidance for making an appropriate placement can be displayed by the upper terminal.

  FIG. 6A is a diagram illustrating a state when the living body is properly placed from another direction. The second living body detection unit and the third living body detection unit are in contact with the left and right side surfaces of the imaging range of the living body part 691, and are determined to have “a living body”. The fourth living body detection unit is in a state where the living body part 691 is not touched, and is determined as “no living body”. Since the living body is compressed by touching this part and blood flow is hindered, a state where it is not touched is preferable. With the above state, it can be determined that the living body is properly placed.

  FIG. 6B is a diagram illustrating a state where only the left side surface portion of the living body part is touched. The third living body detection unit does not touch the living body part 692, and it is determined that there is no living body. In this state, unlike the detection result of FIG. 6A, the placement of the living body is not appropriate, so the registration process / authentication process of biometric authentication is interrupted and the placement is only touched by the fingertip. Notification to the terminal and guidance for making an appropriate placement can be displayed by the upper terminal.

  FIG. 6C is a diagram illustrating a state where only the right side surface portion of the living body part is touched. The second living body detection unit does not touch the living body part 693 and is determined as “no living body”. In this state, unlike the detection result of FIG. 6A, the placement of the living body is not appropriate, so the registration process / authentication process of biometric authentication is interrupted and the placement is only touched by the fingertip. Notification to the terminal and guidance for making an appropriate placement can be displayed by the upper terminal.

  FIG. 7A and FIG. 7B are diagrams for explaining a state where the living body part 790 is pressed and placed. In the operation of biometric registration or biometric authentication, the biometric part is pressed and placed, so that the biometric part sinks, and the fourth biometric detection unit is in contact with the front surface on the root side of the biometric part 790. It is determined. If this part is touched, blood flow will be hindered and it can be said that it is not preferable in the vein authentication device, so the upper terminal is notified that the finger is pressed and is improperly placed. Guidance for placing it can be displayed by the host terminal.

  With the above configuration, biometric registration and authentication are performed when the living body is properly placed, and in the case of improper placement, the biometric registration and authentication are interrupted and guidance is given to ensure proper placement. Thus, it is possible to reduce the person rejection process due to improper placement.

  A second embodiment of the present invention will be described with reference to FIG.

  The arrangement of the biometric authentication device in the second embodiment will be described with reference to FIGS. Note that the functions of the control unit and the relevance to the host terminal are substantially the same except for the handling of the fourth living body detection unit in Example 1 and the contents described below.

  FIG. 8 is a longitudinal sectional view of the biometric authentication device 300 in this embodiment. The imaging unit 820, the light source unit 830, the first biometric detection unit 841, and the second biometric detection unit 842 are biometric information of the biometric part 890. Arranged to detect. The imaging unit 820 is in a position for imaging the central front of the living body part 890. The light source unit 830 irradiates near infrared light from the back side of the living body part 890 toward the range where the living body part is imaged. The first living body detection unit 841 is at a position corresponding to the front side of the imaging range of the living body part 890. If the living body part is touching, it is determined that the placement is appropriate, and if not touching, it is determined that the placement is inappropriate. The second living body detection unit 842 and the third living body detection unit 843 are in positions corresponding to the left and right side surfaces (side surfaces of the abdomen of the finger) of the imaging range of the living body part 890. When it is detected that the living body part is touched, it is determined that the placement is appropriate. When it is detected that the living body part is not touched, it is determined that the placement is inappropriate. In addition, as a means for detecting a living body in the living body detection unit, an electrostatic sensor (touch sensor) that detects the presence or absence of an object by changing a capacitance can be used. Alternatively, it may be a mechanical switch that switches ON / OFF by touching an object, or another switch.

  FIG. 9 is a cross-sectional view of the biometric authentication device 900 according to the present embodiment, and the imaging unit 920, the light source unit 930, and the second biometric detection unit 942 are arranged to detect biometric information of the biological part 990. .

  In FIG. 9, the first living body detection unit is omitted. The imaging unit 920 is in a position for imaging the central front surface of the living body part 990. The light source unit 930 irradiates near-infrared light from the back side of the living body part 990 to the range where the living body part is imaged. The second living body detection unit 942 and the third living body detection unit 943 are at positions where the left and right side surfaces of the imaging range of the living body part 990 touch each other. If the living body part is touching, it is determined that the placement is appropriate, and if not touching, it is determined that the placement is inappropriate. Further, the gap 980 in the inner region of the guide is provided at the front side position on the base side of the imaging range, that is, at the end opposite to the first living body detection unit in the major axis direction of the imaging range of the living body part 990, A space is provided so as not to contact the living body so that the blood flow is not obstructed by pressing the living body part.

  In this embodiment, when all of the first living body detecting unit, the second living body detecting unit, and the third living body detecting unit detect that there is a living body contact, it is determined that the finger is placed properly, and the registration process or Authentication processing shall be performed.

  In addition, when any of the first living body detecting unit, the second living body detecting unit, and the third living body detecting unit detects that there is no living body, it is determined that the finger is improperly placed, and biometric authentication registration processing / authentication is performed. While interrupting the process, it is possible to notify the host terminal that only the tip of the living body has been touched and to display guidance on the host terminal for proper placement.

  With the above configuration, with a simpler configuration, biometric registration and authentication are performed when the living body is properly placed, and in the case of improper placement, the biometric registration and authentication are interrupted for proper placement. By guiding in such a way, it is possible to reduce the refusal of the person due to the wrong placement.

DESCRIPTION OF SYMBOLS 100 ... Biometric authentication apparatus 110 ... Control part 120 ... Imaging part 130 ... Light source part 141 ... 1st biometric detection part 142 ... 2nd biometric detection part 143 ... 3rd biometric detection part 144 ... 4th biometric detection part 150 ... Communication unit 170 ... Host terminal 220 ... Imaging unit 241 ... First living body detection unit 242 ... Second living body detection unit 243 ... Third living body detection unit 244 ... Fourth living body detection unit 270 ... Placement position guide 280 ... Marking position 290 ... Biological part 300 ... Biometric authentication device 320 ... Imaging unit 330 ... Light source unit 341 ... First biological detection unit 342 ... Second biological detection unit 343 ... Third biological detection unit 344 ... Fourth Living body detection unit 390 ... Living body part 400 ... Biometric authentication device 420 ... Imaging unit 430 ... Light source unit 442 ... Second living body detection part 443 ... Third living body detection part 444 ... Fourth living body detection part 490 ... Living body part 59 ... Living body part 592 ... Living body part 593 ... Living body part 691 ... Living body part 692 ... Living body part 693 ... Living body part 790 ... Living body part 800 ... Biometric authentication device 820 ... Imaging part 830 ... Light source part 841 ... First living body detection part 842 ... Second biometric detection unit 843 ... third biometric detection unit 890 ... biometric part 900 ... biometric authentication device 920 ... imaging unit 930 ... light source unit 942 ... second biometric detection unit 943 ... third biometric detection unit 980 ... air gap Part 990 ... living body part 1000 ... gap

Claims (8)

A light source;
An imaging unit for imaging light from the light source that has passed through the living body part;
A processing unit that extracts a blood vessel pattern from an image captured by the imaging unit and registers it as a biometric registration pattern, and performs personal authentication using the biometric registration pattern;
A guide portion indicating the arrangement of the living body part;
A first living body detection unit that is located in an area inside the guide unit and corresponds to the tip of the imaging range of the living body part;
A second living body detection unit located in an inner region of the guide unit and corresponding to a right side surface of the imaging range of the living body part;
A third living body detection unit that is located in the inner region of the guide unit and that corresponds to the left side surface of the imaging range of the living body part;
Located in an inner region of the guide part, and having a gap provided at an end opposite to the first living body detection part in the major axis direction of the imaging range of the living body part,
The processing unit registers the biometric registration pattern when the first biometric detection unit, the second biometric detection unit, and the third biometric detection unit detect contact of the biological part; and A biometric authentication apparatus that performs personal authentication of the biometric registration pattern.   The biometric authentication device according to claim 1, wherein the guide unit has an inclined shape, and the second biometric detection unit and the third biometric detection unit are provided on the inclined slope. Further comprising a fourth living body detection unit provided in the gap,
The processing unit is configured such that the first living body detecting unit, the second living body detecting unit, and the third living body detecting unit detect contact of the living body part, and the fourth living body detecting unit The biometric authentication device according to claim 1, wherein when the contact of the biometric part is not detected, the biometric registration pattern is registered and personal authentication of the biometric registration pattern is performed.   The biometric authentication device according to any one of claims 1 to 3, wherein the gap portion has a shape that does not substantially enter when the living body part is in contact with the guide portion with an appropriate pressure.   The said processing part performs control for the guidance display for making arrangement | positioning of the said biological body part appropriate, when the said 4th biological body detection part detects the contact of the said biological body part. The biometric authentication device according to any one of 4 to 4.   6. The processing unit suspends registration of the biometric registration pattern and personal authentication of the biometric registration pattern when the fourth biometric detection unit detects contact of the biometric part. The biometric authentication device according to 1.   The biometric authentication device according to claim 1, wherein the first biometric detection unit, the second biometric detection unit, and the third biometric detection unit are electrostatic sensors or mechanical switches. .   The first biological detection unit, the second biological detection unit, the third biological detection unit, and the fourth biological detection unit are electrostatic sensors or mechanical switches. 7. The biometric authentication device according to 6.

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