JP4861157B2 - Finger vein authentication device - Google Patents

Description

  The present invention relates to a finger vein authentication apparatus that performs authentication based on a finger vein pattern (blood vessel pattern) as biometric information for identifying an individual.

  As personal authentication technology using a part of the body as a key, various methods using biometric information such as a finger or palm pattern, a face or iris, or a blood vessel pattern of a hand or finger have been proposed. Among them, the finger vein authentication device uses a finger vein pattern (blood vessel pattern) as personal identification information.

  A finger vein authentication device generally known from the past has a finger placed between a light source that emits near-infrared light and an imaging device (camera) that is disposed to face the light source at a predetermined interval. The image of the finger when the near-infrared light is irradiated to the finger from the light source is taken by the imaging device, and the image of the finger vein pattern imaged by the imaging device is compared with the image of the finger vein pattern registered in advance. Then, authentication discrimination is performed based on the correlation between the two. It should be noted that the blood vessel portion image of the finger taken by the imaging device is dark because the components in the blood absorb near-infrared light well, making it difficult to transmit light.

By the way, in this kind of finger vein authentication device, for example, the finger authentication device disclosed in the following Patent Document 1, the place where hands and fingers are placed so that the finger vein pattern acquired at the time of collation is the same as that at the time of registration. Various ideas have been made on the shape and mechanism of the sensor part.
JP 2003-30632 A

  However, as the shape of the sensor part of this kind of conventional finger vein authentication device, a shape in which a finger is inserted straightly or a method of collating by expanding the finger and the finger are generally used. FIG. 4 shows an example of the configuration of the sensor unit 24 having a finger placement unit 24a on which one finger is inserted and placed. FIGS. 5A and 5B are examples of changes in vein patterns before and after the finger is rotated 90 ° with the direction in which the finger is extended as the central axis (AA ′) in the sensor unit 24 of FIG. Is shown.

  In this type of finger vein authentication device, a finger vein that is a three-dimensional pattern is acquired as a two-dimensional pattern of a planar image. In the finger vein authentication device employing the sensor unit 24 having the finger placement unit 24a having the shape shown in FIG. 4, the finger rotates (rolling) with the direction in which the finger is extended as the central axis (AA ′ in FIG. 4). ), The vein pattern shown in FIG. 5 (a) before the finger rotates and the vein pattern shown in FIG. 5 (b) after the finger rotates 90 ° appear to be different in the acquired two-dimensional pattern. End up. As a result, a detection error (hereinafter referred to as a rolling error) occurs.

  However, in the conventional finger vein authentication device, there is no effective means for the above-described rolling error, and there is a high possibility that collation NG occurs due to the rolling error or poor finger placement. The verification NG detects a vein pattern (blood vessel pattern) many times within the verification time, resulting in a delay in response and a decrease in the reliability of the apparatus, thereby reducing operability.

  Accordingly, the present invention has been made in view of the above problems, and an object of the present invention is to provide a finger vein authentication device that can perform authentication without causing discomfort to the user and can improve authentication accuracy. To do.

In order to achieve the above object, a finger vein authentication device according to claim 1 is a finger vein authentication device that performs authentication based on finger vein information that is biometric information for identifying an individual.
A finger placement unit on which a finger to be authenticated and fingers on both sides of the finger to be authenticated are placed; an authentication finger detection unit that detects the finger to be authenticated placed on the finger placement unit; A both-side finger detection unit that detects fingers on both sides of the finger to be authenticated placed on the finger placement unit, and the authentication finger detection unit detects the finger to be authenticated, and the both sides A sensor unit having a vein detection unit that detects a vein pattern of the finger to be authenticated when a finger detection unit detects the fingers on both sides;
A control unit that performs authentication discrimination by comparing a vein pattern of the finger to be authenticated detected by the vein detection unit with a previously registered vein pattern for verification ;
A display for prompting the placement of the finger to be authenticated and the fingers on both sides of the finger to be authenticated, and a display unit for displaying the result of the authentication determination,
The control unit causes the display unit to display a display prompting the placement of the fingers on both sides on the finger placement unit unless the both side finger detection unit detects the fingers on both sides. Features.

The finger vein authentication device according to claim 2 is the finger vein authentication device according to claim 1,
An input unit for inputting identification information for identifying a finger to be authenticated by the user;
An information storage unit that pre-registers and stores a matching vein pattern for each identification information;
The control unit, when identification information is input from the input unit, causes the display unit to display a display that prompts the finger placement unit to place the finger to be authenticated and the fingers on both sides, A vein pattern that the vein detection unit detects from the authentication target finger when the authentication finger detection unit detects the authentication target finger and the both side finger detection unit detects the both side fingers; The identification number input from the input unit and the corresponding vein pattern for verification in the information storage unit are collated for authentication discrimination.

  According to the finger vein authentication device of the present invention, verification can be performed in a state where the finger to be authenticated and the fingers on both sides of the authentication target finger are fixed, and the difference in the blood vessel pattern of the finger vein at the time of registration and at the time of verification The authentication accuracy is improved compared to the conventional case. In addition, since it is not necessary to detect the vein pattern many times within the verification time and there is no delay in the authentication time, authentication with good responsiveness can be realized.

  Hereinafter, the best mode of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a block diagram showing a schematic configuration of a finger vein authentication device according to the present invention, FIG. 2 is a schematic configuration diagram of a housing provided with a finger placement portion of the finger vein authentication device according to the present invention, and FIG. It is an operation | movement flowchart of the finger vein authentication apparatus which concerns on.

  As shown in FIG. 1, the finger vein authentication device 1 of this example is roughly configured to include a finger vein detection unit 2 and an information processing unit 3. Hereinafter, the configuration of each unit will be described.

  First, the finger vein detection unit 2 includes a sensor unit 4, a vein information storage unit 5, a sensor control unit 6, and a status display unit 7.

  The sensor unit 4 is incorporated in a housing 8 as shown in FIG. The casing 8 is provided with a finger placement portion 9 for placing a finger. As shown in FIG. 2, on the placement surface of the finger placement unit 9, the front end and the base end on the ventral side of the authentication finger are placed on the part where the finger to be authenticated (hereinafter also referred to as the authentication finger) is placed. Is provided. The support portion 9a may be formed with a material that does not give an excessive feeling of pressure when supporting the finger so that the support surface is formed in conformity with the shape of the abdomen side of the finger so that positional displacement does not occur. preferable.

  In addition, if the placement surface of the part where the fingers on both sides of the authentication finger are placed has grooves or dents, the user may feel uncomfortable if the grooves or dents do not match the length or thickness of the fingers. As a result of experiments, it has been found that the finger itself has resistance, so the flat surface 9b is formed so as not to give discomfort or resistance to the user due to the grooves or depressions.

  In the finger placement unit 9 having the above-described configuration, when registration or verification is performed using the middle finger as an authentication finger, the distal end and the proximal end of the middle finger on the middle finger are supported by the support unit 9a along AA ′ in FIG. (The central axis in the direction in which the finger is extended) and the ventral side of the index finger of the fingers on both sides of the middle finger as the authentication finger are placed on B of FIG. 2 on the flat surface 9b, and the belly of the ring finger The side is placed on C of FIG. 2 on the flat surface 9b.

  In this way, the authentication finger to be registered and verified and the ventral sides of the fingers on both sides of the authentication finger are placed and fixed on the finger placement unit 9 to support the authentication finger and prevent the authentication finger from rolling. Yes.

  Although not shown in FIG. 2, the housing 8 forms a space for inserting a finger between the housing 8 and the upper portion of the housing 8 so as to prevent intrusion of external light into the space. It has been broken. In addition, a light source that is a constituent element of a vein detection unit 13 to be described later for irradiating the authentication finger with near-infrared light is provided above the finger placement unit 9 on which the authentication finger is placed. Furthermore, between the support portions 9a and 9a of the finger placement portion 9 on which the authentication finger is placed, the light transmitted through the authentication finger from the light source is allowed to pass and the foreign matter can be prevented from entering the housing 8. A light-transmitting plate such as a glass plate or an acrylic plate, and an optical filter that transmits only light in the near-infrared wavelength region of light transmitted from the light source through the authentication finger are provided.

  As shown in FIG. 1, the sensor unit 4 includes an authentication finger detection unit 11, both side finger detection units 12, and a vein detection unit 13. The authentication finger detection unit 11 detects the presence or absence of an authentication finger placed on the finger placement unit 9 and is configured by, for example, a well-known sensor of a capacitance type or a pressure sensitive type, and sends a detection signal to the sensor control unit 6. Is entered. The both-side finger detection unit 12 detects the presence or absence of a finger on both sides of the authentication finger placed on the finger placement unit 9 together with the authentication finger. The sensor control unit 6 inputs a detection signal.

  The vein detection unit 13 detects a vein pattern (blood vessel pattern) of the authentication finger placed on the finger placement unit 9, and includes, for example, a light source and an imaging device. The light source irradiates near-infrared light to the authentication finger placed on the finger placement unit 9 at the time of registration or verification of vein information. The imaging device is configured by a camera or the like, for example, is positioned directly below the finger placement unit 9 on which the authentication finger is placed, and is opposed to the light source. Authentication when the near-infrared light is irradiated from the light source to the authentication finger A finger image is picked up, and vein information (blood vessel pattern) of the authentication finger is detected from the picked-up image. The vein information detection unit 13 inputs vein information detected from the authentication finger placed on the finger placement unit 9 to the sensor control unit 6 at a detection timing from the sensor control unit 6 described later.

  The vein information storage unit 5 is configured by a semiconductor memory such as a magnetic or optical storage medium, an electrically rewritable ROM, or a RAM, for example. An ID number assigned in advance for each target finger is used, and matching vein information (collation blood vessel pattern) is associated with each ID number and stored in advance.

  In FIG. 1, the vein information storage unit 5 and the vein detection unit 13 are separated from each other as a function realizing unit. However, the vein information storage unit 5 is provided in an imaging device that is a component of the vein detection unit 13. It can also be configured.

  The sensor control unit 6 controls the detection timing of the vein detection unit 13 based on the exchange of signals with a reader control unit 15 (to be described later) and the input of detection signals from the authentication finger detection unit 11 and both side finger detection units 12. The display control of the status display unit 7 is performed.

  The main control contents will be described. The sensor control unit 6 receives the vein information corresponding to the ID number (the blood vessel pattern for verification) when receiving a request for the verification operation from the reader control unit 15 to be described later. The retrieved vein information is used as collation source data. Further, the sensor control unit 6 receives the authentication finger when the authentication finger and the detection signal indicating that the fingers on both sides of the authentication finger are placed from the authentication finger detection unit 11 and the both side finger detection unit 12. The detection timing is output to the vein detection unit 13 in order to detect the vein information. Further, the sensor control unit 6 collates the vein information from the vein detection unit 13 detected at the above detection timing with the collation source data for authentication discrimination, and outputs the result to the reader control unit 15 described later. Further, the sensor control unit 6 controls the display of the state display unit 7 so that the collation possible state and the collating state can be identified at the time of collation between the vein information and the collation source data.

  Here, the vein information detected by the vein detection unit 13 will be briefly described. In the two-dimensional pattern imaged by the imaging device of the vein detection unit 13, the vein pattern has a dark luminance value as compared with the surrounding area without the blood vessel, and the center of the blood vessel peaks in the luminance value profile of the cross section perpendicular to the traveling direction of the blood vessel. You can see valleys or depressions. Therefore, the center of the valley or the depression of the brightness value is detected for all the vertical and horizontal profiles of the captured two-dimensional pattern image. In this detection method, the opening angle and curvature of the profile curve may be calculated, and the depression may be detected based on the average value theorem. If the luminance value at that position is increased so that only the detection point is emphasized, the center of the dark line of the entire image is enhanced, the finger vein pattern can be extracted, and the vein information of the authentication finger can be detected.

  The state display unit 7 is configured by, for example, a semiconductor light emitting element (LED), and identifies and displays a collation enabled state and a collating state as a collation state under the control of the sensor control unit 6. For example, green light is emitted when collation is possible, and red light is emitted when collation is in progress.

  Next, as illustrated in FIG. 1, the information processing unit 3 includes an input unit 14, a reader control unit 15, a display unit 16, a data output unit 17, and a power supply unit 18.

  The input unit 14 includes operation keys including various input keys including a numeric keypad operated by the user at the time of registration or verification of vein information of the authentication finger. The input unit 14 uses an ID number (a fixed number assigned in advance for each user) that is specified in advance as identification information for identifying the user's own authentication finger at the time of registration or verification of vein information of the authentication finger. When it is input by a user's key operation, the input information (ID number) at this time is input to the reader controller 15. In addition, the input unit 14 is configured to display either an input mode mode selection screen based on a registration mode for registering authentication finger vein information and a verification mode for verifying authentication finger vein information on the display unit 16. Used when selecting the mode.

  The reader control unit 15 comprehensively controls the operation of the entire apparatus including the exchange of signals with the sensor control unit 6 in order to execute the processing shown in FIG. The main control content will be described. The reader control unit 15 performs display control on the display unit 16 so as to make an input request for the ID number from the input unit 14 at the time of registration or verification of vein information of the authentication finger. is doing. Further, the reader control unit 15 acquires the input of the ID number from the input unit 14, requests the sensor control unit 6 to perform a collation operation according to the ID number, and responds to the collation operation request from the sensor control unit 6. The display unit 16 and the data output unit 17 are controlled so as to perform display and data output according to the acquired authentication determination result.

  The display unit 16 is composed of a liquid crystal display device or the like having a predetermined display screen. Under the control of the reader control unit 15, the display unit 16 prompts the user to input an ID number from the input unit 14, and the finger placement unit 9 has an authentication instruction. Display that prompts the user to place fingers on both sides of the authentication finger, mode selection screen display for registration mode for registering authentication finger vein information and verification mode for verifying authentication finger vein information, authentication discrimination result display, etc. Is going.

  The data output unit 17 outputs a collation result and information corresponding to the collation result under the control of the reader control unit 15.

  The power supply unit 18 inputs AC100V (commercial power supply) or DC24V, and supplies necessary drive power supply (voltage) to each unit constituting the apparatus.

  Next, the operation at the time of finger vein authentication of the finger vein authentication apparatus 1 having the above configuration will be described with reference to the flowchart of FIG.

  When the ID number is input from the input unit 14 in the finger standby state (ST1) in which the authentication finger and the fingers on both sides of the authentication finger are placed on the finger placement unit 9, the authentication finger and the authentication are input to the finger placement unit 9. A display prompting the placement of the fingers on both sides of the finger is displayed on the display unit 16. For example, “Place your finger on the sensor unit” is displayed on the display unit 16 (ST2).

  Thereby, the user sees the display on the display unit 16 and places the authentication finger and the ventral sides of the fingers on both sides of the authentication finger on the finger placement unit 9. Thereafter, the authentication finger detection unit 11 detects the presence or absence of the authentication finger, and the sensor control unit 6 determines whether or not the authentication finger is placed on the finger placement unit 9 based on the detection signal from the authentication finger detection unit 11, that is, FIG. It is determined whether or not the authentication finger is placed on AA ′ of (ST3). If it is determined that the authentication finger is not placed on the finger placement unit 9 (no authentication finger is placed on A-A ′ in FIG. 2), the process returns to ST2.

  When it is determined that the authentication finger is placed on the finger placement unit 9 (the authentication finger is placed on AA ′ in FIG. 2), the both-side finger detection unit 12 determines whether or not there are fingers on both sides of the authentication finger. 2 is detected, whether or not both side fingers are placed on the finger placement unit 9 by the detection signal from the both side finger detection unit 12, that is, both sides of the fingers are placed on B and C in FIG. It is determined whether or not it has been received (ST4). When it is determined that the fingers on both sides are placed on the finger placement unit 9 (the fingers on both sides are placed on B and C in FIG. 2), the collation operation is started (ST5).

  In this collation operation (ST5), the reader control unit 15 requests the sensor control unit 6 to perform a collation operation. The sensor control unit 6 receives the verification operation request from the reader control unit 15, searches the vein information storage unit 5 for verification vein information corresponding to the ID number, and searches the verification source vein information for the verification source. Data. Thereafter, the sensor control unit 6 compares the vein information detected by the vein detection unit 13 with the verification source data at the detection timing when the authentication finger and the fingers on both sides are detected, and performs authentication discrimination, and the result is reader-controlled. To the unit 15. The reader control unit 15 acquires the authentication determination result from the sensor control unit 6 in response to the verification operation request, and controls the display unit 16 and the data output unit 17 to perform display and data output according to the acquired authentication determination result. To do.

  In ST4, if it is determined that the fingers on both sides are not placed on the finger placement unit 9 (no fingers are placed on B and C in FIG. 2), the fingers on both sides are placed on the finger placement unit 9. A display prompting the user to place is displayed on the display unit 16. For example, “Place your finger on both sides” is displayed on the display unit 16 (ST6). Thereafter, the sensor control unit 6 determines whether or not this display continues for a predetermined time (ST7). When the sensor control unit 6 determines that the predetermined time has elapsed, the display of the display unit 16, that is, the display of "Place your finger on both sides" is deleted and the timer (time measuring means) is canceled ( ST8), the process returns to ST2.

  In addition, with the display unit 16 displaying “Place your fingers on both sides”, the fingers on both sides were placed on the finger placement unit 9 within a certain time (see B in FIG. 2). If it is determined that fingers on both sides are placed on C), the above-described collation operation is started.

  When the user registers the authentication finger, the user selects both the authentication finger and the authentication finger after selecting the registration mode from the input unit 14 while the mode selection screen is displayed on the display unit 16. When the authentication finger detection unit 11 and the both side finger detection unit 12 detect that the finger is placed on the finger placement unit 9, the vein detection unit 13 detects the vein information of the authentication finger and collates the detected vein information. The original data can be registered and stored in the vein information storage unit 5 in association with a predetermined ID number (unregistered ID number).

  By the way, in the embodiment described above, the vein information for verification is registered and stored in advance in the vein information storage unit 5 for each ID number as identification information, and the vein information for verification corresponding to the ID number from the input unit 14 is stored in the vein information. Although it is set as the structure of 1: 1 authentication searched from the part 5 and used as collation source data, and collated with the vein information of the authentication finger detected by the vein detection part 13, it is not limited to this structure.

  For example, vein patterns of fingers of all users who use this apparatus are registered and stored in the vein information storage unit 5 in advance as collation source data, and the vein information detected by the vein detection unit 13 and the vein information storage unit 5 are stored. A so-called 1: n authentication configuration in which the verification source data of all users registered and stored is verified. In this case, the trouble of inputting the ID number from the input unit 14 before authentication can be saved.

  In addition, the user's authentication finger is registered after the registration mode is selected from the input unit 14 in a state where the mode selection screen is displayed on the display unit 16, and then the fingers on both sides of the authentication finger and the authentication finger are placed on the finger placement unit. If the authentication finger detection unit 11 and the both-side finger detection unit 12 detect that it is placed on the vein 9, the vein detection unit 13 detects the vein information of the authentication finger, and uses the detected vein information as the verification source data The information can be stored in the information storage unit 5 in the order of registration.

  Furthermore, in FIG. 1, the control unit is configured to be divided into the sensor control unit 6 and the reader control unit 15, but the sensor control unit 6 and the reader control unit 15 may be configured as one control unit.

  Thus, in the finger vein authentication device 1 of this example, focusing on prevention of finger rolling used for authentication, the authentication finger is difficult to roll by fixing the authentication finger and the fingers on both sides of the authentication finger. And adopts a method of detecting that the authentication finger and the fingers on both sides of the authentication finger are fixed. Then, after detecting the fixation of the authentication finger and the fingers on both sides of the authentication finger by this detection method, the vein information (blood vessel pattern) is obtained from the authentication finger and collated, and the finger on both sides of the authentication finger and the authentication finger is checked. If fixation cannot be detected, attention is urged to place the finger in the correct position.

  As a result, verification can be performed with the authentication finger and the fingers on both sides of the authentication finger fixed, and there is almost no difference in the blood vessel pattern of the finger vein at the time of registration and verification. improves. In addition, since it is not necessary to detect the vein pattern many times within the verification time and there is no delay in the authentication time, authentication with good responsiveness can be realized.

  In addition, since the authentication accuracy is improved as compared with the conventional case, and there is no delay and the responsiveness is improved, the above-described 1: n authentication can also be put into practical use, and a synergistic effect that the variation of authentication methods increases can be achieved.

  Furthermore, if it is configured to add a function of displaying the correct placement of the finger to the state display unit 7 provided in the sensor unit 4, it becomes possible to provide a separation type device in which only the sensor unit 4 can be arranged separately from the main body, The place of use is not limited, and the range of use is expanded. At that time, guidance display when the finger placement is not appropriate is also possible for the user.

It is a block diagram which shows schematic structure of the finger vein authentication apparatus which concerns on this invention. It is a schematic block diagram of the housing | casing provided with the finger mounting part of the finger vein authentication apparatus which concerns on this invention. It is an operation | movement flowchart of the finger vein authentication apparatus which concerns on this invention. It is a figure which shows an example of a structure of the sensor part of the shape which inserts and puts one finger straight in the conventional finger vein authentication apparatus. (A), (b) In the sensor part of FIG. 4, it is a figure which shows an example of the change of the vein pattern before and behind rotating a finger 90 degrees by making the direction which extended the finger into the central axis (A-A ').

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Finger vein authentication apparatus 2 Finger vein detection part 3 Information processing part 4 Sensor part 5 Vein information storage part 6 Sensor control part 7 Status display part 8 Case 9 Finger mounting part 9a Support part 9b Flat surface 11 Authentication finger detection part 12 Bilateral finger detection unit 13 Vein detection unit 14 Input unit 15 Reader control unit 16 Display unit 17 Data output unit 18 Power supply unit

Claims (2)

In a finger vein authentication device that performs authentication based on finger vein information that is biometric information for identifying an individual,
A finger placement unit on which a finger to be authenticated and fingers on both sides of the finger to be authenticated are placed; an authentication finger detection unit that detects the finger to be authenticated placed on the finger placement unit; A both-side finger detection unit that detects fingers on both sides of the finger to be authenticated placed on the finger placement unit, and the authentication finger detection unit detects the finger to be authenticated, and the both sides A sensor unit having a vein detection unit that detects a vein pattern of the finger to be authenticated when a finger detection unit detects the fingers on both sides;
A control unit that performs authentication discrimination by comparing a vein pattern of the finger to be authenticated detected by the vein detection unit with a previously registered vein pattern for verification ;
A display for prompting the placement of the finger to be authenticated and the fingers on both sides of the finger to be authenticated, and a display unit for displaying the result of the authentication determination,
The control unit causes the display unit to display a display prompting the placement of the fingers on both sides on the finger placement unit unless the both side finger detection unit detects the fingers on both sides. Characteristic finger vein authentication device. An input unit for inputting identification information for identifying a finger to be authenticated by the user;
An information storage unit that pre-registers and stores a matching vein pattern for each identification information;
The control unit, when identification information is input from the input unit, causes the display unit to display a display that prompts the finger placement unit to place the finger to be authenticated and the fingers on both sides, A vein pattern that the vein detection unit detects from the authentication target finger when the authentication finger detection unit detects the authentication target finger and the both side finger detection unit detects the both side fingers; 2. The finger vein authentication device according to claim 1, wherein authentication discrimination is performed by comparing an identification number input from the input unit with a corresponding verification vein pattern of the information storage unit .

Images