KR20060051655A - Image-taking device and personal authentication device - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an imaging device or a personal authentication device, wherein a case in which one finger is placed downwards, a light source unit generating transmitted light from the side of the finger, and an interference filter having light transparency to an arbitrary wavelength. An object of the present invention is a personal authentication device comprising: an image capture unit for transmitting an image and a transmitted light passing through the interference filter unit through a mirror; and an image processing unit for venous image data of the finger output from the image capture unit. In a personal authentication device using a vein image of the present invention, a technology of the shape of a personal authentication device that can easily authenticate the fingers of both the left and right hands and yields a high level of authentication accuracy is provided.

Description

Imaging device or personal authentication device {IMAGE-TAKING DEVICE AND PERSONAL AUTHENTICATION DEVICE}

1 is an external perspective view of a personal authentication device.

FIG. 2 is a sectional view of the imaging unit viewed from the front with the finger on the personal authentication device of FIG. 1. FIG.

It is sectional drawing which looked at the imaging part from the side in the state which put the finger on the personal authentication apparatus of FIG.

4 is an external view showing another embodiment of a personal authentication device.

5 is an external view showing another embodiment of a personal authentication device.

* Description of reference numerals indicating major parts *

1 ... upper case

2 ... bottom case

3 ··· light source

4 ··· light source window

Interference filter

6 finger finger support guide

7 ... fingertip alignment guide

8 fingertip support guide

9 ... palm support guide

10 ... LED based

11 LED light source

12 ... reflector

13 ... camera

14 ... control unit

15 ... authentication target finger

16 Fingers close to the finger to be authenticated

Light emitted from a light source

18 shooting light

19 External connector

20 finger support

21 ... palm support guide

The present invention relates to a device for biometric authentication and in particular to a device for personal authentication or identification using finger vein image data.

The use of information (data), such as fingerprints or irises, may be used as personal authentication using human biometric information. Among them, finger vein authentication technology using an image of a vein inside a human finger is drawing attention. As a method of performing personal authentication using this finger vein image data, there is a patent document 1, a case having an insertion unit for inserting a fingerprint of one finger toward the lower surface, and a light source unit generating transmitted light from the upper surface of the finger. And an image pickup unit for imaging an interference filter unit having optical transparency to an arbitrary wavelength, an image pickup unit for imaging the transmitted light passing through the interference filter unit, and the vein image data of the finger output from the image pickup unit with image data previously stored in the storage unit. The personal authentication device which becomes an image processing part which produces | generates the possible combination data is disclosed.

The position of the finger to be authenticated is inserted into the insertion part of the authentication target, and the depth of the finger touches the tip of the finger, and the left and right directions are guided by the upper finger's root alignment. The eye is aligned to the center of the finger on the triangular mark installed on the center.

[Patent Document 1] Japanese Patent Application Laid-Open No. 2004-049705

In the above-mentioned patent document 1, the height of a frame body becomes high by arrange | positioning a light source part on the upper part of a recognition target finger, and there exists a problem of enlargement of an apparatus. Moreover, since the light source part covers the insertion part, the user feels anxiety about putting a finger in the insertion part which cannot see inside. In addition, there is a drawback that the accuracy of personal authentication is lowered because the rotation of the left and right directions of the finger is visually matched to the triangular mark, resulting in an imbalance, dispersion, and inability to obtain finger vein image data.

An object of the present invention is to solve one or more of the above problems. For example, a finger vein authentication apparatus capable of easily setting a combination of fingers on both left and right fingers with respect to pre-stored data and having a high reproducibility (or high authentication accuracy) can acquire a finger vein image. The present invention provides a device for providing a finger vein authentication device that is reassuring or compact for a customer.

According to the present invention, there is provided a case in which an open finger mounting part can be placed on the bottom face of a finger, a light source part generating transmitted light from both sides with respect to the finger, and an interference filter part having light transmission only for arbitrary wavelengths. An imaging device or personal authentication device which combines the image pickup unit for imaging the transmitted light transmitted through the filter unit and the vein image data of the finger output from the image pickup unit with the image data stored in advance.

The finger mounting portion has a fingertip guide portion for regulating the tip position of the finger, a left and right guide portion for regulating the left and right positions of the finger, and a guide portion for regulating rotation of the finger in the left and right directions. Preferably, the interference filter unit separates the transmitted light and other light emitted from the light source unit, or the fingertip guide unit is disposed so that the second joint is positioned directly above the interference filter unit from the first joint, which is the central portion in the longitudinal direction of the finger. Do. In addition, the vein for imaging is provided with a finger rest portion that lifts the finger from the interference filter portion so that the bottom of the finger touches the interference filter portion so as not to deform the vein in order to image the vein close to the bottom of the finger.

That is, when the finger is placed on the finger attachment portion of the authentication device, the finger is separated in the long axis direction; Release in the direction of the finger short axis (deviation from the left and right of the finger); Rotational deviation about the long axis of the finger; It is necessary to prevent the positional deviation of the finger from the vein image capturing unit, to make the imaging surface of each finger the same, and to improve the reproducibility of reading the finger vein data. A wall where the fingertips are fitted on the innermost side of the finger mounting portion to prevent deviation of the long finger direction at that point; Install a wall where both sides of the finger touch to prevent deviation of the short axis of the finger; In order to prevent the rotation based on the tightening of the fingers, a palm guide part for regulating the rotation of the palm is provided.

In particular, the method of preventing rotation about the long axis of a finger is difficult to prevent rotation even if only one finger is supported. At the same time, even if a plurality of fingers are supported, when the palm is turned in the rotation direction around the long axis of the finger, the finger is also present. Follow it around. In other words, this rotation of the finger is solved by supporting not to rotate the palm, but only the finger. The palm supporting surface may support the entire palm, but the rotation of the finger can be regulated by simultaneously supporting a plurality of joints under the image of the finger and under the joint of the neighboring finger in a plane.

1 is an external perspective view of a personal authentication device; Fig. 2 is a sectional view of the imaging unit viewed from the front with the finger on the personal authentication device of Fig. 1; 3 is a cross-sectional view of the imaging unit viewed from the side with the finger placed on the personal authentication device of FIG. 1. Moreover, this personal authentication apparatus is an operation surface of the ATM automatic transaction apparatus (ATM) which performs the deposit and withdrawal transaction installed in financial institutions, etc .; In particular, it is preferable to use it on the side of the touch panel to use or replace it with a password, and to install it in a financial sales office and use it in the form of authenticating an individual. In the following example, the control unit combines registered personal data for image processing of finger vein image data captured by the personal authentication device. However, the control unit may be installed outside the device or sufficient to capture finger vein data. It is also referred to simply as an imaging device.

As shown in FIG. 1, the personal authentication apparatus covers the mounting devices with the upper case 1 and the lower case 2, and the light source mounting portion 3 is positioned from the upper case 1 to the left and right sides, that is, a pair of the upper case 1 Protrude upward from the plane of). In the light source mounting unit 3, the light source irradiation window 4 is opened such that the left and right sides face each other. As shown in the figure, the upper case 1 is open so that the bottom surface of the finger can be loaded downward, so that the user's anxiety is less than the method of inserting the finger in any part. An interference filter 5 is provided on the surface fitted to the light source mounting portion 3, and the interference filter 5 is a sheet made of glass or resin capable of transmitting only near infrared rays. In front of the interference filter 5, the finger source support guide 6 supporting the source of the finger, and the finger tip alignment guide (finger tip guide part 7) for aligning the tip of the finger on the inner side of the interference filter and the tip of the finger are supported. Fingertip support guide (8) is located and the palm support guide (9) for supporting the palm is located in front of the upper case (1). In addition, the guides 6 and 8 are also collectively referred to as finger regulating guide portions (also referred to simply as guide portions) for regulating the rotation of the fingers and the shift in the left and right directions.

In the method of placing a finger, the tip of the middle finger is aligned with the fingertip alignment guide 7 and the fingertip support guide 8 and the finger root support guide 6 are placed like a two-dot chain line. On the other hand, the index finger and the weak finger, which are not the subject of authentication, are disposed outside the light source mounting portion 3 and the palms are extended and placed on the palm support guide 9. That is, the finger other than the authentication target may be in accordance with the finger mounting portion and the case surface blocked by the light source protrusion 3. Thus, since the shape which made the pair of light source mounting parts 3 thin and long along the finger long direction is employ | adopted, the middle finger of an authentication finger can be firmly fixed with an index finger and a weak finger. The fingertip alignment guide 7 regulates the position in the longitudinal direction (front and rear) of the middle finger, which is the object of authentication, and the finger root support guide 6 and the fingertip support guide 7 regulate the cross of the left and right fingers. In accordance with the R-shape, the recess is provided. Each guide 6 and 7 also has a function to lift the stop so that the finger bottom does not contact the interference filter 5. The suspension of the certification target is regulated before, after, left and right by each guide, but there is some instability only by the regulation of the finger. That is, when the palm is tilted in the left and right directions, the middle finger is rotated in the left and right directions, so the palm is placed in the palm support guide 9 supporting the palm so that the palm does not tilt in the left and right directions. The palm support guide 9 may be a large area supporting all of the bottom surfaces, but for the operator who has a feeling of not wanting to touch the other person, as shown in this figure, the palm support guide 9 is also vertically and thinner with respect to the optical case 8. The shape long in a direction is preferable. In Fig. 1, the middle finger is used as the authentication target finger. However, the left and right fingers can be used as the authentication target finger.

Next, as shown in Fig. 2 and Fig. 3, first, a plurality of light source LEDs (light emitting diodes) 11 are mounted in a line inside the light source mounting unit 3, which is a pair of left and right sides of the finger to be authenticated, as shown in Figs. Isolated LED base 10 is mounted. Light irradiated from the light source LED 11 through the light source irradiation window 4 touches right next to the recognition target finger. Specifically, as shown in FIG. 1, the light source is irradiated from the first joint in the longitudinal direction of the finger to the second joint. The light source is located at the same height as the center height of the finger and the irradiated light 11 is reflected inside the finger and comes out of the finger. That is, the light source unit is positioned at both sides of the finger mounting unit (reference numerals 6; 7; 8) and irradiates light toward the recognition target finger from the lateral direction of the recognition target finger. There are a plurality of light emitting diodes 11 in a row on the insulating substrate 10, and are arranged at equal intervals at least between the first joint and the second joint of the finger. In addition, since the light source part is irradiated with the transmitted light from a very high position in the transverse direction with respect to the finger to be recognized, the vein imaging can be captured more clearly because of less reflection of the bottom surface of the finger. It has a light source protrusion (protrusion above the upper surface of the upper case 1) to protrude so that the light source protrusion (3) is between the finger to be authenticated and the finger near the authentication target finger and the other finger does not overlap each other. It does not have the function.

Light emitted from the bottom of the finger (light toward the bottom of the figure) passes through an interference filter 5 that transmits only near infrared rays, and is then redirected to the reflector 12 to be picked up by a camera (imaging section 13). That is, the interference filter unit diffuses the reflected light irradiated from the light source unit inside the finger and transmits only the near infrared ray, which is an arbitrary wavelength of the transmitted light emitted from the bottom of the finger. Near-infrared is easily absorbed by hemoglobin in the blood, so the vein is dark and brightly photographed except the vein. Since hemoglobin in the blood has a function of absorbing near-infrared light, blood vessels are darkened and lightly reflected except blood vessels. The control unit 14 synthesizes the captured data as finger vein image data. That is, the vein image data on the right and left sides of the finger obtained through the pair of left and right LED irradiation are edited to be one vein image data and combined with previously registered registration data. The registration completion data is stored in a bank card (medium) owned by the user or in a trading device such as a cash automatic transaction device or a sales terminal, or a storage device of a host / server, and the control unit 14 receives such registration data and captures the image. It may be combined with data, or the combination function may be provided outside the apparatus, and the control unit 14 may transmit the imaged data to the outside of the apparatus and combine it externally. The result of the combination is displayed on the terminal connected to the external connection connector 19. In addition, the imaging unit 13 detects the image of the vein and automatically starts imaging the vein in comparison with the imaging before loading the authentication target finger. Since the operation of pressing the manual switch of imaging start is unnecessary, the finger to be authenticated does not move. In this way, the positional deviation and rotational deviation can be suppressed in the operation only by placing the finger on the authentication device, and finger vein image data can be obtained with high reproducibility.

By adopting the structural features described above, the target finger of the person to be authenticated is placed on the finger rests (6; 8), etc., which touch the fingertips to the fingertip guide portion 7 located at the innermost portion of the finger mounting portion, and at the same time, the palm guide portion. Put your palm on (9). This suppresses the separation of the distance of the rotational disengagement imaging unit 13 around the positional deviation finger long axis of the front, rear, left and right.

 In addition, since the present invention has an open flat case shape, there is no restriction to specify a finger, and therefore, the finger can be used as an authentication target finger on both the left and right fingers.

Example 2

4 is an example in which the light source mounting unit 20 is different in shape from the light source mounting unit 3 of FIG. 1. The fingers to be authenticated are the same as those of FIG. 1, and the fingers neighboring the fingers to be authenticated are placed on the light source mounting unit 20. In the case where the operator's finger is short, the finger is touched by the light source mounting unit 3 of FIG. 1. Since it may tear, this can be prevented. However, the light source mounting portion 20 is preferably provided with an inclination 21 because the source of the finger to be authenticated is separated from the finger origin support guide 6 when the step is too attached in the height direction with the finger origin support guide 6. .

Example 3

FIG. 5 shows an example in which the palm support guide 9 of FIG. 1 approaches the finger to shorten the depth of the device. The control unit 24 may be compactly mounted in the apparatus or may be other externally attached control unit 24 via the relay cable 23 as well. Palm support guide 22 is effective in regulating the rotation of the left and right direction of the finger because it supports three indirect (부근) in the vicinity of the finger when approaching the finger.

According to the present invention, in the personal authentication using the vein image of the finger, the combination of the fingers can be easily set to the correct position for both the left and right fingers with respect to the data stored in advance. In addition, by obtaining a finger vein image with high reproducibility, a personal authentication device with high authentication accuracy can be provided.

Claims (9)

A case provided with a part facing the bottom of the finger downward; A pair of protrusions which protrude from the case surface and are separated from each other for a predetermined time; A light source unit for irradiating light from the side to the finger between the protrusions; An interference filter unit disposed between the protrusions and on the case surface and having light transmittance with respect to an arbitrary wavelength of light; And an imaging unit arranged under the interference filter unit and for imaging the transmitted light passing through the interference filter unit.  In the imaging device of claim 1, And a control unit which processes the vein image data of the finger output from the imaging unit. In the imaging device of claim 1, And a guide portion for regulating the movement of a finger between the protrusions and on the case surface. In the imaging device of claim 3, And the guide portion includes a fingertip guide for regulating fingertips and a finger restraint guide with an R-shaped depression for regulating the tip of the finger or near the finger origin. In the imaging device of claim 3, And the guide portion protrudes from the case surface so as to provide a space between the interference filter portion and the finger. In the imaging device of claim 1, And a palm support guide provided in the direction perpendicular to the protrusion on the case surface. In the imaging device of claim 1, And the light source unit arranges a plurality of light emitting diodes arranged inside the protrusions and emitting a near infrared ray on a substrate in a row. A case provided with a part facing the bottom of the finger downward, and a pair of protrusions protruding upward from the case surface and spaced apart from each other by a predetermined interval; A light source unit for irradiating light on both sides and both sides of the finger placed between the protrusions; An interference filter unit disposed between the protrusions and on the case surface and having light transmittance with respect to an arbitrary wavelength of light; An imaging unit arranged below the interference filter unit and for imaging the transmitted light passing through the interference filter unit; And the finger vein image data photographed by the imaging unit and the previously registered finger vein image data.  In the personal authentication device according to claim 8, The protrusion is a personal authentication device, characterized in that the elongated shape along the long direction of the finger.

Images