JP2007328571A - Multimodal biometric authentication system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a multimodal biometric authentication system which allows a photographing unit to automatically rotate to authenticate a subject 28 in response to his or her preference. <P>SOLUTION: The multimodal biometric authentication system includes: an iris photographing unit 3 for photographing at least eyes of the subject 28; a distance measurement part 6 for repeatedly measuring a distance to the subject 28; a determination part 7 for determining whether eyes of the subject are within an in-focus range of the iris photographing unit 3 or not; a vein photographing unit 5 for photographing at least a palm of the subject 28; a fingerprint photographing unit 4 for photographing at least fingers of the subject 28; an image processing part 10 for determining the palm or fingers of the subject 28 from a binary image resulting from binarizing an image photographed by the vein photographing unit 5, on the basis of a fixed threshold of an area of black parts of the image; and a control part 8 for selecting the iris photographing unit 3, the vein photographing unit 5, or the fingerprint photographing unit 4. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an authentication apparatus that performs personal authentication using any one of a subject's eyes, palms, and fingers.

Conventionally, a non-contact IC card gate device with fingerprint authentication is provided as a gate opening / closing means at a gate, for example, a doorway of a room, and the gate device is automatically locked and unlocked by using a fingerprint or an IC card. There has been proposed one that allows or prohibits people from entering or leaving (see, for example, Patent Document 1).
JP 2005-350960 A

  However, the conventional contactless IC card gate device with fingerprint authentication can identify the person by reading the IC card data or fingerprint information and automatically open and close the gate. However, since the IC card is a portable product, it may be easily lost. Yes, with the combined authentication method of IC card and fingerprint authentication, it cannot be used with the specified biometric authentication due to the physical condition of the subject (for example, fingerprint authentication is difficult for people with thin fingerprints, finger cutting, etc.) There are drawbacks. Of course, there are people who cannot use biometrics such as iris, hand vein, and voice due to some physical disability. As described above, there is a problem that biometric authentication corresponding to the user cannot be freely selected.

  The present invention has been made to solve the conventional problems, and does not require a portable product such as an IC card, and can select any one of a plurality of biometric authentications. An object is to provide an apparatus.

  The multimodal biometric authentication apparatus according to the present invention includes an iris photographing unit that photographs at least an eye of a subject, a distance measuring unit that repeatedly measures a distance to the subject, and a distance to the subject that is measured by the distance measuring unit. A determination unit that determines whether or not the eye of the subject is in a focusing range of the iris photographing unit, a vein photographing unit that photographs at least a palm of the subject, and a fingerprint photographing unit that photographs at least a finger of the subject. And binarizing (black and white) the image captured by the vein imaging unit, and determining whether the area of the black portion of the image is from the binarized image based on a fixed threshold or the palm of the subject or the subject An image processing unit (area determination unit) for determining a finger of the user, and the iris photographing based on a result determined by the determination unit or the image processing unit Knit Alternatively, the vein imaging unit or has a configuration in which a control unit for selecting the fingerprint imaging unit.

  With this configuration, the target authentication device can automatically perform an authentication operation according to the user's intention to select the authentication device.

  The present invention can provide a multimodal biometric authentication device having an effect of freely selecting a user's preference.

Hereinafter, a multimodal biometric authentication device according to an embodiment of the present invention will be described with reference to the drawings.
(First embodiment)

  FIG. 1 shows a functional configuration of the authentication device 1 according to the first embodiment of the present invention. In FIG. 1, the authentication apparatus 1 moves the vein imaging unit 5 for imaging the palm of the subject 28, the fingerprint imaging unit 4 for imaging the finger of the subject 28, and the iris imaging unit 3 for imaging the eye of the subject 28 around the circumference. For the rotary pan 2, the distance measuring unit 6 that repeatedly measures the distance to the subject 28, and the binarization process on the image obtained from the vein imaging unit 5 and the process of calculating the area of the binarized image In addition, the image processing unit 10 that determines a palm or a fingerprint based on a threshold whose total area is fixed, and a control unit 8 that selects each photographing unit based on a result determined by the image processing unit 10. .

  About the authentication apparatus 1 comprised as mentioned above, the operation | movement is demonstrated using FIGS.

  First, in FIG. 2A, when the distance measuring unit 6 has a distance L1 between the subject 28 and the authentication device 1 of 35 cm or more, the iris mode is set, and the iris photographing unit 3 performs photographing / authentication.

  In FIG. 2B, when the distance measurement unit 6 has a distance L2 between the subject 28 and the authentication device 1 of less than 35 cm, based on the result obtained from the distance measurement unit 6, the determination unit 7 In order to switch to 5, the rotary pan 2 is instructed to enter the vein mode, and the vein imaging unit 5 performs imaging / authentication. At that time, as shown in FIG. 3A, the area of the binary image extracted on the parallel line at the fixed position after binarization by the image processing unit 10 using the image captured by the vein imaging unit 5. When the total area is equal to or greater than a fixed threshold, vein authentication is started.

  2B is used to calculate the sum of the areas of the binary images extracted on the parallel lines at the fixed positions after binarization by the image processing unit 10 using the images taken by the venous imaging unit 5 in operation. If the sum of the areas is less than the fixed threshold value, the determination unit 7 instructs the rotary pan 2 to switch to the fingerprint photographing unit 4 based on the result obtained from the image processing unit 10, The fingerprint mode is entered, and the fingerprint photographing unit 4 performs photographing / authentication. FIG. 2C shows a situation where the fingerprint photographing unit 4 has photographed and authenticated the finger at that time.

  Next, FIG. 4 is an operation flowchart of the authentication device 1.

  As shown in FIG. 4, first, the distance measurement unit 6 starts measuring the distance from the authentication device 1 to the subject 28, repeatedly measures the distance to the subject 28, and outputs the measurement result to the determination unit 7. (S1). Then, the determination unit 7 determines the output from the distance measurement unit 6, and the determination result of the determination unit 7 is sent to the control unit 8.

  In the determination result of the determination unit 7, when the measurable range of the distance measurement unit 6 is 35 cm or more, the control unit 8 operates the iris photographing unit 3 (S3) and starts authentication (S9).

  On the other hand, in the determination result of the determination unit 7, when the measurable range of the distance measurement unit 6 is less than 35 cm, the control unit 8 rotates the rotary pan 2 and the vein imaging unit 5 operates (S4).

  Next, using the image captured by the vein imaging unit 5, after binarization by the image processing unit 10, the total area of the binary image is calculated, and whether the total area is greater than or equal to a fixed threshold value Is determined (S5).

Subsequently, when the total area is less than the fixed threshold value, the determination result of the image processing unit 10 is sent to the control unit 8, the rotary pan 2 is rotated, the fingerprint photographing unit 4 is operated (S6), and authentication is started. (S8).

  Subsequently, when the total area is equal to or larger than the fixed threshold value, the determination result of the image processing unit 10 is sent to the control unit 8, and the vein imaging unit 5 starts authentication as it is (S7).

  According to such a functional configuration of the authentication device 1 according to the first embodiment of the present invention, the function of reading which gesture of the subject 28 is to be selected by the parallel operation of the distance measurement unit 6 and the image processing unit 10. In response to the request of the subject 28, the vein imaging unit 5, the fingerprint imaging unit 4, or the iris imaging unit 3 can automatically rotate and perform an authentication operation.

Next, the photographing specifications of the present invention are shown in FIG. The distance from the glass and the shooting range for the iris, vein, and fingerprint are as follows.
In the case of fingerprint: distance from glass = 0 cm, shooting range = 5 cm
At the time of vein ... Distance from glass = 5cm, shooting range = 30cm
When Iris ... Distance from glass = 30cm, shooting range = 10cm
FIG. 5 shows the relationship between the photographing object 51, the lens 52, and the CCD 9. If the size of the object 51 is a and the size of the CCD is c, the viewing angle when the object 51 is imaged by the CCD 9 is α. If the distance between the object to be photographed and the lens is u, the distance between the CCD and the lens is v, and the distance between the object to be photographed and the CCD is l, the following equation is established.

・・・（１）

... (1)

  From equation (1), u, v, and α can be obtained as in equation (2).

・・・（２）

... (2)

  Since the Gauss formula for the lens is used, the focal length f of the lens can be obtained.

・・・（３）

... (3)

  FIG. 6 shows the calculated values when the distance between the object and the glass is 0 cm for a fingerprint, 5 cm for a vein, and 30 cm for an iris.

The focal length f of the lens, the distance v between the lens and the CCD, etc. differ depending on the object to be photographed.
(Second Embodiment)

  The fingerprint photographing unit 4, the vein photographing unit 5, and the iris photographing unit 3 shown in FIG. 7 are each configured to satisfy the conditions of FIG. The rotary pan 2 is provided with a vein photographing unit 5, a fingerprint photographing unit 4, and an iris photographing unit 3.

  Each photographing unit configured as described above will be described with reference to FIGS. 7A, 7B, and 7C (FIG. 7 top views (a) to (c) and FIG. 8 slope view (a)). (The description of (c) is omitted).

  First, in the side view (a) of FIG. 7, the eye of the subject 28 is photographed through the CCD 9 using the iris lens 17 of the iris photographing unit 3 for photographing the eye of the subject 28.

  Subsequently, in the side view (b) of FIG. 7, the palm of the subject 28 is photographed through the CCD 9 using the vein lens 18 of the vein photographing unit 5 that photographs the palm of the subject 28.

  Subsequently, in FIG. 7C, the finger of the subject 28 is photographed through the CCD 9 using the fingerprint lens 19 of the fingerprint photographing unit 4 for photographing the finger of the subject 28.

  Since the CCD 9 uses the same type of CCD when the vein photographing unit 5, the fingerprint photographing unit 4 and the iris photographing unit 3 photograph, the CCD 9 is shared. However, the distance between the iris glass 20 and the iris lens 17 and the distance between the vein glass 21 and the vein lens 18 are the same, but the distance between the fingerprint glass 22 and the fingerprint lens 19 is different.

  Accordingly, the iris glass 20 and the iris lens 17, the vein glass 21 and the vein lens 18, the fingerprint glass 22 and the fingerprint lens 19 are set, and the CCD 9 for photographing the subject 28 is shared.

Finally, FIG. 9 shows the shape of the authentication device 1 when photographing the subject 28. On the rotary pan 2 added to the authentication device 1, a vein photographing unit 5, a fingerprint photographing unit 4, and an iris photographing unit 3 are arranged. In order to improve the appearance, the rotary pan 2 is covered with a cover 25 to which the unit window 16 and the distance measuring unit 6 are added.

  As described above, according to each imaging unit of the second embodiment of the present invention, the vein imaging unit 5, the fingerprint imaging unit 4, and the iris imaging unit 3 are provided on the rotary pan 2. By sharing the CCD 9 used when the photographing unit 4 and the iris photographing unit 3 photograph, the cost can be reduced and the configuration of the authentication device can be simplified.

  As described above, in the multimodal biometric authentication device according to the present invention, the imaging unit automatically rotates and authenticates according to the user's wishes, so that it is possible to deal with the physically handicapped and trouble the user. It is useful as an authentication device or the like that performs personal authentication using any of the subject's eyes, palms, and fingers.

The block diagram of the functional structure of the authentication apparatus 1 in 1st Embodiment of this invention. Fig. 3 is a photographing technique diagram of the authentication device 1 according to the first embodiment of the present invention. The procedure figure of the image processing part of authentication device 1 in a 1st embodiment of the present invention. The flowchart of the functional structure of the authentication apparatus 1 in 1st Embodiment of this invention. Explanatory drawing which showed the relationship between the imaging | photography target object 51 of the authentication apparatus 1 in 1st Embodiment of this invention, the lens 52, and CCD9. Imaging condition diagram of fingerprint imaging unit 4, vein imaging unit 5, iris imaging unit 3 of authentication device 1 in the first embodiment of the present invention Side view of each photographing unit in the second embodiment of the present invention The slope view of each imaging unit in the second embodiment of the present invention Shape figure of authentication apparatus 1 in 1st Embodiment of this invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Authentication apparatus 2 Rotary pan 3 Iris imaging unit 4 Fingerprint imaging unit 5 Vein imaging unit 6 Distance measurement part 7 Judgment part 8 Control part 9 CCD
10 Image processing unit (area determination unit)
DESCRIPTION OF SYMBOLS 11 Authentication process part 12 Switching part 13 Iris authentication process part 14 Fingerprint authentication process part 15 Vein process part 16 Unit window 17 Iris lens 18 Vein lens 19 Fingerprint lens 20 Iris glass 21 Vein glass 22 Fingerprint glass 23 LED
24 Infrared LED
25 Cover 26 Axis 28 Subject 51 Shooting Object 52 Lens

Claims (7)

An iris unit that captures at least the eye of the subject;
A distance measuring unit that repeatedly measures the distance to the subject;
A determination unit that determines whether or not the eye of the subject is in a focusing range of the iris photographing unit based on the distance to the subject measured by the distance measurement unit;
A vein imaging unit that captures at least the palm of the subject;
A fingerprint photographing unit for photographing at least a finger of the subject;
The image captured by the vein imaging unit is binarized (black and white), and from the binarized image, the size of the area of the black portion of the image is determined based on a fixed threshold value, the palm of the subject or the finger of the subject. An image processing unit (area determination unit) for determining
And a controller for each imaging unit that selects the iris imaging unit, the vein imaging unit, or the fingerprint imaging unit based on a result determined by the determination unit or the image processing unit. A biometric authentication device. The determination unit further determines whether the eye of the subject is closer or farther than the focusing range of the iris photographing unit;
The control unit of each of the photographing units selects the iris photographing unit when the determination unit determines that the eye of the subject is far from the focusing range. Biometric authentication device. The determination unit further determines whether the eye of the subject is closer or farther than the focusing range of the iris photographing unit;
2. The control unit of each imaging unit selects the vein imaging unit when the determination unit determines that the eye of the subject is closer to the focusing range. Biometric authentication device.   The vein imaging unit selected by the control unit of each imaging unit captures the palm of the subject or the finger of the subject, and the captured image is binarized and binarized by the image processing unit. The biometric authentication device according to claim 3, wherein the palm of the subject is determined when the area of the black portion of the subject is larger than a fixed threshold.   The vein imaging unit selected by the control unit of each imaging unit captures the palm of the subject or the finger of the subject, and the captured image is binarized and binarized by the image processing unit. The biometric authentication device according to claim 3, wherein when the area of the black portion of the subject is smaller than a fixed threshold, the finger of the subject is determined. An imaging device according to any one of claims 1 to 5,
An authentication processing unit for performing an authentication process on an image photographed by the iris photographing unit or the vein photographing unit or the fingerprint photographing unit of the photographing device;
An authentication apparatus comprising: An imaging device characterized by sharing the imaging CCD of the iris imaging unit, the vein imaging unit, and the fingerprint imaging unit.

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