JP2001167252A - Ophthalmic image preparing method, method and device for identifying iris - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily identify the user of spectacles at high speed. SOLUTION: Two illuminations 2-1 and 2-2 are switched and one synthetic ophthalmic image having no reflection of illuminations 2-1 and 2-2 on spectacles is prepared from two ophthalmic images photographed by an ophthalmic image photographing part 10 by an image synthesizing part 24. While using this synthetic ophthalmic image, an iris code is generated by a code generating part 30, the generated iris code is collated with iris codes registered in a data base 40 by a collating part 33, and a person 3 to be identified is certified.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an eye image creating method, an iris authentication method, and an iris authentication device for performing personal identification using an iris (iris) of a human eye.
In particular, it is possible to simply and quickly perform authentication of a spectacle user.

[0002]

2. Description of the Related Art An iris is a portion around a pupil of a pupil, and is composed of muscles for adjusting the degree of opening of the pupil. To form Therefore, personal identification can be performed using the iris pattern.

Conventionally, various techniques relating to personal authentication have been disclosed, and for example, there are those described in the following documents. Literature: IEEE TRANSACTIONS ON PATTERN ANALYSYS AND MA
CHINEINTELLIGENCE, 15 [11] (1993-11) John G. Dau
gman `` High Confidence Visual Recognition of Persons
bya Test of Statistical Independence '' P.1148-11
60 In the above-mentioned document, a technique for authenticating an individual by the characteristics of an iris is disclosed. FIG. 2 shows this conventional eye image capturing situation.
(A) and (b) show.

In the method of the above-mentioned document, a camera 1 and a light 2 are provided, and a user (ie, a person to be identified) 3 facing the camera 1 is illuminated by the light 2 and the eyes of the person to be identified 3 are illuminated by the camera 1. The eye image of No. 4 is taken. The eye 4 has a circular pupil 4a
There is a circular iris 4b around the pupil 4a. In the pupil 4a, for example, a white illumination portion 2a for the illumination 2 is shown. After a code (i.e., an iris code) expressing the characteristics of the iris is generated from the eye image captured by the camera 1, the code is collated with an iris code registered in a database in advance, and the individual is authenticated. Such an iris authentication device performs authentication by photographing an image of the eye 4 of the identified person 3 from a remote place.
It has a feature that the person to be identified 3 can be used without contacting the device, and is excellent in convenience.

[0005]

However, in the conventional iris authentication method or iris authentication apparatus, the conventional iris authentication method or the iris authentication apparatus shown in FIG.
As shown in FIG. 5, the eyeglasses 5 are used to capture an eye image by irradiating from a single direction in a state where the camera 1 for capturing an image and the illumination 2 for irradiating the identified person 3 are installed at relatively close positions. When the identified person 3 is used as an authentication target, the illumination 2 for imaging is reflected on the lens surface of the spectacles 5, and the spectacle reflection portion 5a overlaps the image position of the eye 4 required for the authentication. In some cases, rejection (authentication impossible) was made. In addition, even if the rejection does not occur, a burden such as having the identified person 3 move so that the spectacle reflection portion 5a does not overlap the eye 4 at the time of imaging may be imposed, and as a result, until the authentication is completed. There was also a problem that it took time. An object of the present invention is to solve the problems of the prior art, and to provide an eye image creation method, an iris authentication method, and an iris authentication device capable of performing authentication of a spectacle user and the like easily and at high speed. I do.

[0006]

According to a first aspect of the present invention, in the method for creating an eye image, a subject is illuminated by a plurality of illumination means having different installation positions. Irradiating processing, eye image photographing processing of photographing a plurality of eye images having different illumination reflection positions with respect to the identified person, detecting each iris position of the photographed plurality of eye images, The plurality of eye images are synthesized by performing alignment of each iris position, determining whether the luminance value of each pixel present in each eye image is equal to or greater than a threshold, and replacing the image with an image smaller than the threshold ( I.e., bonding), and image synthesis processing for creating a synthetic eye image.
I'm trying to do it.

[0007] By adopting such a configuration, the discriminated person is illuminated by the plurality of illuminating means, and a plurality of eye images having different illumination reflection positions are photographed for the discriminated person. Each iris position of a plurality of photographed eye images is detected, the respective iris positions are aligned, and each pixel present in each eye image is replaced with a pixel having a small luminance value, and the plurality of iris positions are replaced. Are combined (that is, pasted together) to create a combined eye image. As a result, a synthesized eye image without reflection of illumination is created.

According to a second aspect of the present invention, in the iris authentication method, an irradiating process of irradiating the identified person with a plurality of illuminating means having different installation positions, and a plurality of illumination devices having different illumination reflection positions with respect to the identified person. Image synthesis processing for capturing an eye image of an eye and image synthesis for generating information of an iris code expressing characteristics of an iris portion in which reflection of illumination has been eliminated by combining information of the plurality of captured eye images. -Code generation processing and collation processing for authenticating an individual by collating the generated iris code with a pre-registered iris code are performed.

By adopting such a configuration, the identification object is illuminated by the plurality of illumination means, and a plurality of eye images having different illumination reflection positions are photographed for the identification object. The information of the plurality of photographed eye images is synthesized, an iris code in which the reflection of the illumination is eliminated is generated, and the iris code is compared with an iris code registered in advance in a database or the like, and an individual is collated. Be authenticated.

According to a third aspect of the present invention, in the iris authentication method of the second aspect, in the image synthesizing / code generating process, a plurality of photographed eye images are attached to each other to form a synthetic image, and then the iris code of the synthetic image is generated. Generate or
Alternatively, after generating each iris code of a plurality of photographed eye images, these iris codes are combined to generate an iris code for collation.

By adopting such a configuration, after a plurality of photographed eye images are stuck together to form a composite image, an iris code of the composite image is generated or photographed. After a plurality of iris codes are created, these iris codes are combined to generate an iris code for collation.

According to a fourth aspect of the present invention, in the iris authentication method, an irradiating process of irradiating the identified person with a plurality of illuminating means having different installation positions, and a plurality of illumination devices having different illumination reflection positions for the identified person Eye image photographing processing for photographing an eye image of the eye, code generation processing for respectively generating iris codes representing features of an iris portion from the plurality of photographed eye images, and registering the generated iris codes in advance A collation process for collating the obtained iris code and a combining process for adding the collation results of the collation process to eliminate the reflection of illumination and then authenticating the individual are performed.

[0013] By adopting such a configuration, the discriminated person is illuminated by the plurality of illuminating means, and a plurality of eye images having different illumination reflection positions are photographed for the discriminated person. An iris code is generated from each of a plurality of photographed eye images, and each of these iris codes is compared with an iris code registered in a database or the like in advance. After the individual is authenticated.

In the iris authentication apparatus according to the fifth aspect, a plurality of illuminating means for irradiating the person to be identified from different installation positions, respectively, and a plurality of eyes having different illumination reflection positions with respect to the person to be identified. Eye image photographing means for photographing an image, image combining means for pasting and combining the plurality of photographed eye images to create a combined image in which the reflection of illumination has been eliminated, and an iris portion from the combined image. The apparatus includes code generation means for generating an iris code representing features, and matching means for authenticating an individual by comparing the generated iris code with a previously registered iris code.

By adopting such a configuration, the identification object is illuminated by the plurality of illumination means, and a plurality of eye images having different illumination reflection positions are provided to the identification object by the eye image photographing means. Be photographed. The plurality of photographed eye images are attached and combined by an image combining unit, a combined image in which the reflection of illumination is eliminated is created, and an iris code is generated from the combined image by a code generating unit. The generated iris code and an iris code registered in advance in a database or the like are collated by collation means, and the individual is authenticated.

According to a sixth aspect of the present invention, in the iris authentication apparatus according to the fifth aspect, the image synthesizing means detects each iris position of a plurality of photographed eye images and aligns the iris positions. By determining whether or not the luminance value of each pixel present in each of the eye images is equal to or greater than a threshold and replacing it with a pixel smaller than the threshold, the plurality of eye images are combined to create a combined eye image I have. By employing such a configuration, each iris position of a plurality of captured eye images is detected, and the iris positions are aligned. Then, each pixel present in each eye image is replaced with a pixel having a small luminance value, and a plurality of eye images are combined (that is, combined) to create a combined eye image. As a result, a synthesized eye image without reflection of illumination is created.

According to a seventh aspect of the present invention, in the iris authentication device, a plurality of illuminating means for irradiating the identified person from different installation positions, and a plurality of eyes having different illumination reflection positions with respect to the identified person. Eye image photographing means for photographing an image, code generating means for generating a plurality of iris codes each representing a feature of each iris portion from the photographed plurality of eye images, and synthesizing the plurality of iris codes And a matching means for authenticating the individual by comparing the combined iris code with a pre-registered iris code. .

By adopting such a configuration, the identification object is illuminated by the plurality of illumination means, and a plurality of eye images having different illumination reflection positions are provided to the identification object by the eye image photographing means. Be photographed. An iris code is generated from the plurality of captured eye images by the code generation unit, and the iris codes are synthesized by the code synthesis unit, thereby generating a synthesized iris code in which the reflection of illumination is eliminated. Then, the combined iris code and the iris code registered in advance in a database or the like are collated by the collation means, and the individual is authenticated.

According to an eighth aspect of the present invention, in the iris authentication device of the seventh aspect, the code synthesizing unit determines whether each bit of the iris code is at a position where the reflection of the illumination occurs, and the reflection of the illumination is determined. When it is determined that the position is occurring, the iris code is replaced with another iris code bit in which the reflection of illumination does not occur. By adopting such a configuration, each bit of the iris code is determined by the code synthesizing unit as to whether or not the position where the reflection of the illumination is generated, and is determined as the position where the reflection of the illumination is generated. Occasionally, it is replaced with bits of another iris code in which the reflection of illumination does not occur. Thereby, an iris code for collation without reflection of illumination is generated.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) (Configuration) FIGS. 1A and 1B are diagrams showing the configuration of an iris authentication apparatus according to a first embodiment of the present invention. 2) is an overall view thereof, and FIG. 2 (b) is a view in the vicinity of the eye image photographing unit 10 in FIG. 2 (a). Elements common to those in FIG. ing.

The iris authentication device of the present embodiment has
A plurality of illumination means (for example, first and second) are used in order to photograph the eye 4 of the identified person 3 with the iris 4 and to easily and quickly authenticate the identified person 3 from the iris 4b of the eye 4. From the plurality of eye images (e.g., first and second eye images) EI1 and EI2 taken while switching the illuminations 2-1 and 2-2. By creating one synthetic eye image EI1-2, it is possible to perform iris authentication that is not affected by spectacle reflection.

That is, a first illumination 2-1 and a second illumination 2-2 for illuminating the identified person 3 are provided in the oblique direction of the identified person 3. Further, near the identified person 3, an eye image photographing means (for example, an eye image photographing unit) 1 is provided.
0 is set. The eye image photographing unit 10 identifies the identified person 3
For example, the camera 11 and an analog / digital converter (hereinafter, referred to as an “A / D converter”) 12 such as a camera 11, a capture board, and the like, and a plurality of eye images having different illumination reflection positions. It is composed of a combination of the digital input / output interface 13 and the like.

The camera 11 outputs an eye image EI of the person 3 to be identified.
1, EI2, and A / D
The converter 12 is connected. The A / D converter 12 converts an analog video signal captured by the camera 11 into a digital signal, and outputs the digital signal to the outside of the eye image capturing unit 10 via the digital input / output interface 13. Has become. A main control unit 20 is connected to an output side of the eye image photographing unit 10, and the main control unit 20
The authentication unit 30 is connected to the output side of the.

The main control unit 20 has a central processing unit (hereinafter referred to as "C
PU ". ) And the like. The main control unit main body 21 is connected to an illumination control unit 22, a camera control unit 23, and an image synthesizing unit (for example, an image synthesizing unit) 24 which are controlled thereby. The illumination control unit 22 includes control signals S22-1 and S22 for controlling blinking and light amounts of the first and second lights 2-1 and 2-2.
22-2. The camera control unit 23
The camera 11 is controlled by outputting the control signal S23, and has functions such as focusing. The image synthesizing unit 24 includes the first and second images input from the eye image photographing unit 10.
The eye images EI1 and EI2 are used to synthesize one eye image (that is, a synthesized eye image) EI1-2.

The authentication section 30 connected to the output side of the main control section 20 includes an authentication section main body 31, a code generation section (for example, a code generation section) 32, and a verification section (for example, a verification section) 3.
3. The authentication unit main body 31 controls the code generation unit 32 and the collation unit 33, and includes a CPU and the like. The code generation unit 32 includes the main control unit 20
The iris portion is extracted from the synthetic eye image EI1-2 supplied from the iris source, and an iris code E used for iris authentication is extracted.
C is generated. The collation unit 33 collates the iris code EC generated by the code generation unit 32 with an iris code EC ₀ registered in advance in a registration unit (for example, a database (DB)) 40 to obtain an authentication result. .

(Iris Authentication Method) FIGS. 3A and 3B
FIG. 3 is a diagram showing an eye image in the iris authentication device of FIG.
FIG. 3A shows the first illumination illuminated by the first illumination 2-1.
FIG. 1B shows the eye image EI1 of FIG. 1 and FIG.
The figure which shows the 2nd eye image EI2 when illuminated by light 2-2.
It is. (X in FIG. 3)₀ , y₀ ), (X₀', Y₀') Is a circle
Coordinates of the center point of the pupil 4a and the iris 4b of the shape, P₁ , P
₁', P_Two , P_Two'Is a pixel in the iris 4b, (x₁, y
₁), (X₁', Y₁'), (X_Two , y_Two ), (X_Two', Y
_Two') Is the pixel P ₁ , P₁', P_Two , P_Two′ Coordinate position,
I₁ , I₁', I_Two , I_Two'Is the pixel P₁ , P₁', P_Two ,
P_Two′, R is the center point coordinate (x₀ , y₀ ),
(X₀', Y₀') To the pixel P₁ , P₁′, 5a
Reference numerals -1 and 5a-2 indicate circular spectacle reflection portions. Figure 4 is a diagram
1 shows an iris authentication process using the first iris authentication device.
FIG. 5 is a flow chart and FIG.
It is a flowchart which shows a process.

Hereinafter, an iris authentication method using the iris authentication device of FIG. 1 will be described with reference to FIGS.
In the flowchart of FIG. 4, first, in step ST1
In the irradiation process, the control signal S22-1 of the illumination control unit 22 is used.
Turns on the first illumination 2-1. Next, in the eye image photographing process of step ST2, the eye image photographing section 10
The eye image EI1 of the person to be identified 3 is acquired by the camera 11 in the inside, and the process proceeds to step ST3. In step ST3, the position and the size of a circle that fits the outer edge of the pupil 4a and the outer edge of the iris 4b are determined. For example, the degree of the fit of the circle to the outer edge of the iris is evaluated by the following equation (1), and the center position (ie, the center point coordinates (x ₀ , y ₀ )) and the radius R of the circle at which this value is the highest are determined. The search can be performed.

(Equation 1) Here, the integral symbol indicates that the luminance values I (x, y) of the image are added along the circumference of the center position (x, y) and the radius r. Equation (1) evaluates the luminance difference between concentric circles whose radius r differs by Δr.

Next, in the irradiation process in step ST4, the second control signal S22-2 of the illumination control unit 22 is used.
Is turned on, and in the eye image photographing process in step ST5, the eye image photographing unit 10 acquires the eye image EI2 of the identified person 3 again, and proceeds to step ST6. In step ST6, the position (that is, the center point coordinates (x ₀ ′, y ₀ )) and the size (that is, the radius R ′) of the circle corresponding to the outer edge of the pupil and the outer edge of the iris of the eye image EI2 acquired by the eye image capturing unit 10 ). These are steps ST1 to S
The process is performed in the same manner as the process in T3, and the process proceeds to the image synthesis process in step ST7. In step ST7, step ST
The eye combining unit 24 combines one eye image (that is, a combined eye image) EI1-2 from the eye image EI1 captured in Step 2 and the eye image EI2 captured in Step ST5. This combining process is shown in the flowchart of FIG.

In the flowchart of FIG. 5, first, in step ST7-1, the outer periphery of the pupil 4a and the outer periphery of the iris 4b are surrounded on the first eye image EI1 captured by turning on the first illumination 2-1. The luminance value is obtained for each pixel existing in the region. For example, to obtain a luminance value I ₁ of the pixels P ₁ position of FIG. _{3 (a) (x 1,} y 1), position (x ₂ ,, y ₂₎ luminance value I ₂ of the pixel P ₂ of. Then, in step ST7-2, the luminance values I ₁ , I
It is determined whether or not ₂ is greater than or equal to a threshold T. Luminance value I ₁ of the pixels P _1, because not hidden by eyeglasses reflection portion 5a-1, the process proceeds is determined to be equal to or smaller than the threshold value T to step ST7-4. Luminance value I ₂ of the pixel P _2, since hidden by eyeglasses reflection portion 5a-1, is determined to be equal to or greater than the threshold T, the process proceeds to step ST7-3.

In step ST7-3, step S
Using the eye image EI2 obtained at T5, the pixel P shown in FIG.
'Position of (x _2' pixel P ₂ in FIG. 3 corresponding to the position of _{2 (x 2, y 2)} (b), y 2 ') obtaining the luminance value I ₂ in the'. The value of 'position of (x _2' pixel P _2, y ₂ '), for example, the shift of the center position between each image in addition to the position of the pixel _{P 2 (x 2, y 2} ), further iris radius R , R 'can be calculated by multiplying by the ratio according to the difference in size. Then, FIG. 3 (b) 'luminance value I _2' of the pixel P _2, and replaces the luminance value I ₂ of the pixel P ₂ of FIG. 3 (a). In step ST7-4, ST7-1 to ST7-1
It is determined whether or not the process of 7-3 has been performed for all the pixels existing in the region surrounded by the outer edge of the pupil and the outer edge of the iris.

With the above processing, the main control unit 20 illuminates the illuminations 2-1 and 2-2-1 from the first and second eye images EI1 and EI2.
Since the synthesized eye image EI1-2 from which the spectacle reflection of No. 2 has been removed can be created, the process proceeds to the code generation / collation processing of step ST8 in FIG. In step ST8, after the iris code EC expressing the features of the iris 4b is generated from the synthetic eye image EI1-2 by the code generation unit 32, the collation unit 33 generates the iris code EC.
And the iris code EC ₀ registered in the database 40 in advance, and personal authentication is performed.

(Effect) In this embodiment, the eye image photographing unit 1
Since the first and second eye images EI1 and EI2 captured at 0 are combined by the image combining unit 24 to create the combined eye image EI1-2, the eye image EI from which spectacle reflection has been removed has been removed.
1-2 can be synthesized, whereby personal authentication can be performed without being affected by spectacle reflection. In addition, the installation positions of the first and second illuminations 2-1 and 2-2 are such that the spectacle reflection portion 5a-1 in FIG. 3A does not overlap with the spectacle reflection portion 5a-2 in FIG. 3B. Such a position may be used. For example, it is preferable to install the first and second illuminations 2-1 and 2-2 so as to illuminate the identification target 3 from a diagonal left and right direction.

(Second Embodiment) (Configuration) FIG. 6 is a diagram showing the configuration of an iris authentication device according to a second embodiment of the present invention, and FIG.
Elements common to those in the middle are denoted by common reference numerals.
The iris authentication device of the present embodiment switches a plurality of illuminations (for example, first and second illuminations) 2-1 and 2-2, and a plurality of eye images (for example, first and second illuminations). First and second iris codes EC1 and EC2 used for iris authentication are generated from the eye images EI1 and EI2, and the first and second iris codes EC1 and EC2 are generated.
By combining the two, iris authentication that is not affected by spectacle reflection can be performed.

That is, in the iris authentication device of the present embodiment, the main control unit 20A and the authentication unit 30A having different configurations from the main control unit 20 and the authentication unit 30 of FIG.
Is connected to the output side. The main control unit 20A has a configuration in which the image combining unit 24 is deleted from the main control unit 20 in FIG. The authentication unit 30A has a configuration in which a code synthesis unit (for example, a code synthesis unit) 34 is newly added to the authentication unit 30 of FIG. The code synthesizing unit 34 is connected to and controlled by the authentication unit main body 31, and controls the first and second eye images EI1, EI1, which are captured using the first and second illuminations 2-1 and 2-2 at different positions. One iris code EC1-2 is synthesized from the first and second iris codes EC1 and EC2 generated from EI2.

(Iris Authentication Method) FIG. 7 is a flowchart showing an iris authentication process using the iris authentication device of FIG. 6, and FIG. 8 is a schematic diagram for explaining the processing contents of the code synthesizing unit 34 of FIG. 9 is a code synthesizing unit 34 in FIG.
6 is a flowchart showing the processing of FIG. In FIG. 8, each "data" in the first and second iris codes EC1 and EC2 is a fixed-length bit string for each feature amount.

Hereinafter, an iris authentication method using the iris authentication device of FIG. 6 will be described with reference to FIGS.
In the flowchart of FIG. 7, first, in step ST1
In the first irradiation process, the control signal S22−
1, the first illumination 2-1 is turned on, and step ST
The process proceeds to twelfth eye image photographing processing. In step ST12,
First eye image E of identified person 3 by eye image photographing unit 10
I1 is acquired, and the process proceeds to the code generation process of step ST13. In step ST13, the code generation unit 32
From the first eye image EI1 acquired by the main control unit 20A,
As shown in FIG. 8, the first iris 4b expressing features
And generates the iris code EC1 of the
In the storage means (for example, a generation result table) 32a.

Next, in the irradiation process of step ST14, the second control signal S22-2 of the illumination control unit 22 is used.
Is turned on, and in the eye image photographing process of step ST15, the eye image photographing unit 10 and the main control unit 20 acquire the second eye image EI2 of the identified person 3 again, and the code of step ST16. Proceed to generation processing. In step ST16, the second iris code EC2 is generated by the code generation unit 32 from the second eye image EI2 acquired by the main control unit 20, as shown in FIG. It is stored in the generation result table 32a. These are performed in the same manner as the processing in steps ST11 to ST13, and the process proceeds to the code synthesis processing in the next step ST17.
This code synthesis processing is shown in the flowchart of FIG.

In the flowchart of FIG. 9, first, in step ST17-1, as shown in FIG. 8, the position on the first eye image EI1 corresponding to each bit of the first iris code EC1 (ie, data 1) , 2, 3...) Are reflected by the spectacle reflection of the first illumination 2-1. This can be performed using the position information on the first eye image EI1 corresponding to each bit of the first iris code EC1.
The information of "K" is stored in the generation result table 32a, and when it is reflected, the information of "NG" is stored in the generation result table 3a.
2a.

As a result of the check in step ST17-1, when it is determined that the spectacle reflection of the illumination 2-1 is reflected, in step ST17-2, as shown in FIG. The data value of “OK” of the same bit in code EC2 is obtained, and step ST17-3 is performed.
Then, the value of the bit is changed.

The above processing is described in step ST17-4.
For all bits of the first iris code EC1.
And repeat. Thereby, the first and second iris
The codes EC1 and EC2 are synthesized, and the steps in FIG.
The process proceeds to the matching process in ST18. In step ST18,
By the combining unit 33, the air combined by the code combining unit 34
Scode EC1-2 and registered in the database 40
Iris code EC ₀ Is verified and personal authentication is performed.
To get the authentication result.

(Effect) In this embodiment, the code generation unit 3
2 and the first and second iris codes EC1, E
Since C2 is synthesized by the code synthesis unit 34, the iris code EC1-
2 can be generated. As a result, authentication can be performed without being affected by spectacle reflection.

(Third Embodiment) (Configuration) FIG. 10 is a configuration diagram of an iris authentication device showing a third embodiment of the present invention, and is common to the elements in FIG. 6 showing the second embodiment. Are given the same reference numerals.

The iris authentication apparatus according to the present embodiment switches a plurality of illuminations (for example, first and second illuminations) 2-1 and 2-2, and a plurality of eye images (for example, first and second illuminations). 2 eye images) From EI1 and EI2, the first and second iris codes EC1 and EC1 used for iris authentication, respectively.
EC2, and generates the first and second iris codes E
C1, EC2 and the iris code EC ₀ registered in advance
By combining 1, EC ₀ 2 and the first and second verification value obtained as a result of collation of MT1, MT2, is obtained to be able to perform iris authentication that is not affected by the reflection on eyeglasses.

That is, in the iris authentication device of this embodiment, the authentication unit 3 having a different configuration is used instead of the authentication unit 30A of FIG.
The point that 0B is provided is different from the second embodiment. In the authentication section 30B, a collation value synthesis section 35 is provided instead of the code synthesis section 34 in the authentication section 30A of FIG. The collation value synthesizing unit 35 is connected to and controlled by the authentication unit main body 31, and controls the first and second illuminations 2-1 and 2-1 at different positions.
First and second eye images EI captured using 2-2
1, and EI2 first and second iris code EC1, EC2 generated from, and iris code EC ₀ 1, EC ₀ 2 registered in the database 40, the first and second collation obtained as a result of the collated One collation value MT1-2 is synthesized from the values MT1 and MT2.

(Iris Authentication Method) FIG. 11 is a flowchart showing the iris authentication process using the iris authentication device of FIG. 10, FIG. 12 is a schematic diagram showing the process of the collation value synthesizing unit 35 of FIG. 10, and FIG. 10 is a flowchart illustrating a process of a collation value synthesizing unit of No. 10;

Hereinafter, referring to FIGS. 11 to 13, FIG.
An iris authentication method using the iris authentication device 0 will be described. In the flowchart of FIG. 11, first, in the irradiation process of step ST21, the first illumination 2-1 is turned on by the control signal S22-1 of the illumination control unit 22, and the process proceeds to the eye image photographing process of step ST22. Step ST2
In 2, the first eye image EI1 of the person to be identified 3 is acquired by the eye image photographing unit 10 and transmitted to the authentication unit 30B via the main control unit 20A. Next, in the code generation process of step ST23, the first iris code EC1 is generated by the code generation unit 32 from the first eye image EI1 provided from the main control unit 20A, and the process proceeds to the irradiation process of step ST24.

In step ST24, the second illumination 2-2 is turned on by the control signal S22-2 of the illumination control unit 22, and in the eye image photographing process in step ST25, the eye image photographing unit 10 again outputs the identified person 3 Of the second eye image EI2, and the authentication unit 30 via the main control unit 20A.
B, and proceeds to the code generation process of step ST26.
In step ST25, a second iris code EC2 is generated by the code generation unit 32 from the second eye image EI2 given from the main control unit 20A, and step ST27 is performed.
Proceed to the collation processing of

[0048] In step ST27, the matching unit 33 performs matching between the iris code EC ₀ 1 registered in the first iris code EC1 and database 40 to obtain a first verification value MT1 shown in FIG. 12 . further,
In collation processing at step ST28, the matching unit 33 performs matching between the iris code EC ₀ 2 registered in the second iris code EC2 and database 40 to obtain a second verification value MT2 shown in FIG. 12 . Here, the first and second collation values MT1 and MT2 are iris codes EC registered in the database 40 in advance.
₀ , EC ₀ 2 and a set of values obtained by calculating the degree of similarity to various feature amounts.

Next, in the comparison value combining process in step ST29, the first and second comparison values MT1 and MT2 obtained in steps ST27 and ST28 are combined. This combining process is shown in the flowchart of FIG. In the flowchart of FIG. 13, first, in step ST29-1, the collation value synthesizing unit 35 performs, as shown in FIG.
The similarity corresponding to each of the calculated feature amounts for the first collation value MT1 is determined by the first illumination 2- in the collation process.
The information on whether or not the first eyeglasses reflection is detected is confirmed. As a result of the check in step ST29-1, when it is determined that the reflection of the spectacles of the illumination 2-1 is not reflected,
The information of "OK" is stored in the storage means (for example, the collation result table) 35a in the collation value synthesizing unit 35, and the process proceeds to step ST29-3. When it is determined that the reflection of the spectacles is reflected, "NG" Is the matching result table 3
5a.

If it is determined that the reflection of the spectacles of the illumination 2-1 is reflected, in step ST29-2, a value of the similarity corresponding to the same feature in the second reference value MT2 is obtained. Then, in step ST29-3, the value of the similarity of the first collation value MT1 is changed with the value with reference to the value of the similarity.

The above processing is repeated in step ST29-4 for the similarity values corresponding to all the feature values of the first reference value MT1. As a result, the first and second comparison values MT1 and MT2 are combined, and the process proceeds to the comparison process of step ST30 in FIG. Step ST30
In, the collation unit 33 calculates the overall similarity based on the collation values MT1-2 synthesized in step ST29, and obtains an authentication result.

(Effect) In this embodiment, the collation value synthesizing unit 3
5, it is possible to combine the iris reference values MT1-2 that are not affected by spectacle reflection, so that authentication can be performed without being affected by spectacle reflection.

(Utilization etc.) (1) As shown in FIGS. 3 (a) and 3 (b), the installation positions of the two illuminations 2-1 and 2-2 in FIG.
As long as a-1 and 5a-2 do not overlap, the illuminations 2-1 and 2-2 may be installed at any positions. Further, in the embodiment, the method or the apparatus for photographing the two eye images EI1 and EI2 using the two illuminations 2-1 and 2-2 has been described.
The number of −2 and the number of eye images EI1 and EI2 may be an arbitrary number of 2 or more.

(2) The iris authentication method or the iris authentication device of the present invention can be applied to any form of authentication method or authentication device that requires personal authentication, such as entry / exit management. It can be used as a method or a device for performing high-speed user authentication.

(3) The iris authentication method or the iris authentication apparatus according to the first embodiment of the present invention shown in FIG. 1 is used when an eye image without illumination reflection is required, such as a medical examination using an eye image. It can also be used as an image creation method or an eye image photographing device.

[0056]

As described in detail above, according to the first aspect of the present invention, a plurality of eye images are stuck together by image synthesis processing to synthesize a combined eye image. As a result, it is possible to create a synthetic eye image in which the influence of the spectacle reflection of the illumination is removed. According to the second and third aspects of the present invention, the iris code from which the reflection of illumination has been eliminated by the image synthesis / code generation processing is generated,
Since the individual is authenticated by comparing the iris code with a pre-registered iris code, it is possible to perform the authentication in which the influence of the spectacle reflection of the illumination is removed, thereby avoiding the rejection due to the spectacle reflection. can do. In addition, there is no need to impose a burden such as having the identified person move so that the spectacle reflection portion does not overlap the eyes during imaging. Therefore, the user of the spectacles can be quickly authenticated.

According to the fourth aspect of the present invention, by combining the collation results of the collation processing to eliminate the reflection of the illumination and authenticate the individual, the iris which is not affected by the spectacle reflection. Can be combined,
Authentication can be performed without being affected by spectacle reflection. According to the fifth and sixth aspects of the present invention, a plurality of photographed eye images are attached to each other and combined to form a combined image in which the reflection of illumination has been eliminated. Eye image can be synthesized,
As a result, personal authentication can be performed without being affected by spectacle reflection.

According to the seventh and eighth aspects of the present invention, a code synthesizing means for synthesizing a plurality of iris codes to generate a synthesized iris code from which the reflection of illumination has been eliminated is provided. An iris code which is not affected can be synthesized, thereby enabling authentication without being affected by spectacle reflection.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an iris authentication device according to a first embodiment of the present invention.

FIG. 2 is a diagram showing a conventional eye image capturing situation.

FIG. 3 is a diagram showing the eye image of FIG. 1;

FIG. 4 is a flowchart illustrating an iris authentication process of FIG. 1;

FIG. 5 is a flowchart illustrating a process of an image combining unit 24 in FIG. 1;

FIG. 6 is a configuration diagram of an iris authentication device according to a second embodiment of the present invention.

FIG. 7 is a flowchart illustrating an iris authentication process of FIG. 6;

FIG. 8 is a schematic diagram showing processing of a code synthesizing unit 34 of FIG. 6;

FIG. 9 is a flowchart showing a process of a code synthesizing unit 34 in FIG. 6;

FIG. 10 is a configuration diagram of an iris authentication device according to a third embodiment of the present invention.

FIG. 11 is a flowchart showing an iris authentication process of FIG. 10;

FIG. 12 is a schematic diagram showing a process of a collation value synthesizing unit 35 of FIG. 10;

FIG. 13 is a flowchart showing a process of a collation value synthesizing unit 35 of FIG. 10;

[Explanation of symbols]

 2-1 and 2-2 Lighting 3 Identifier 4 Eye 4a Pupil 4b Iris 5 Eyeglasses 5a, 5b Eyeglass Reflection Part 10 Eye Image Shooting Unit 20, 20A Main Control Unit 22 Lighting Control Unit 23 Camera Control Unit 24 Image Synthesis Unit 30 , 30A, 30B authentication unit 32 code generation unit 33 collation unit 34 code synthesis unit 35 collation value synthesis unit 40 database

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Akihiro Fujii 1-7-12 Toranomon, Minato-ku, Tokyo Oki Electric Industry Co., Ltd. (72) Inventor ▲ Taka ▼ Koji 1-7-7 Toranomon, Minato-ku, Tokyo No. 12 Oki Electric Industry Co., Ltd. (72) Inventor Akitoshi Tsukamoto 1-7-12 Toranomon, Minato-ku, Tokyo Oki Electric Industry Co., Ltd. F-term (reference) 4C038 VA07 VB04 VC01 VC05 5B043 AA09 BA04 DA05 EA14 GA02 5B047 AA23 AB02 BC12 DA10 DB10

Claims (8)

[Claims] 1. An irradiation process of irradiating a distinguished person with a plurality of illuminating units having different installation positions, and an eye image photographing process of photographing a plurality of eye images having different illumination reflection positions on the distinguished person. Detecting each iris position of the plurality of captured eye images, performing alignment of each iris position, and determining whether or not the luminance value of each pixel present in each of the eye images is equal to or greater than a threshold value. Performing an image synthesis process of synthesizing the plurality of eye images by replacing the plurality of eye images with pixels smaller than a threshold value to generate a synthesized eye image. 2. An irradiation process for irradiating a distinguished person with a plurality of illuminating means having different installation positions, and an eye image photographing process for photographing a plurality of eye images having different illumination reflection positions on the distinguished person. An image synthesis / code generation process of synthesizing information of the plurality of photographed eye images to generate an iris code expressing a feature of an iris portion in which reflection of illumination has been eliminated; A verification process for verifying an individual by comparing an iris code with a pre-registered iris code. 3. An image synthesizing / code generating process, wherein an iris code of the synthesized image is generated after a synthesized image is created by laminating a plurality of photographed eye images, or a plurality of photographed eye images are generated. 3. The iris authentication method according to claim 2, wherein after generating each of the iris codes, the iris codes are combined to generate an iris code for verification. 4. An irradiation process of irradiating a distinguished person with a plurality of illuminating units having different installation positions, and an eye image photographing process of photographing a plurality of eye images having different illumination reflection positions on the distinguished person. And code generation processing for generating iris codes each representing a feature of an iris portion from the plurality of photographed eye images; and matching processing for matching each of the generated iris codes with a pre-registered iris code. A combination process of adding the collation results of the collation process to eliminate reflection of illumination and then authenticating an individual. 5. A plurality of illuminating means for irradiating a distinguished person from different installation positions, respectively; an eye image photographing means for photographing a plurality of eye images having different illumination reflection positions for the distinguished person; Laminating and synthesizing the plurality of captured eye images,
Image combining means for creating a combined image from which the reflection of illumination has been eliminated; code generating means for creating an iris code representing the features of an iris portion from the combined image; and the generated iris code registered in advance. An iris authentication device, comprising: a matching unit that authenticates an individual by checking the iris code. 6. An image synthesizing unit detects each iris position of a plurality of photographed eye images, performs alignment of each iris position, and sets a luminance value of each pixel present in each eye image to a threshold value. By determining whether or not the above, replace the pixels with pixels smaller than the threshold, synthesize the plurality of eye images,
6. The iris authentication device according to claim 5, wherein a composite eye image is created. 7. A plurality of illuminating means for irradiating a distinguished person from different installation positions, respectively; an eye image photographing means for photographing a plurality of eye images having different illumination reflection positions for the distinguished person; Code generating means for generating a plurality of iris codes each representing a feature of each iris portion from the plurality of photographed eye images, and combining the plurality of iris codes to eliminate reflection of illumination. An iris authentication device, comprising: code synthesizing means for generating a synthetic iris code; and matching means for authenticating an individual by comparing the synthesized iris code with a previously registered iris code. 8. The code synthesizing means determines whether each bit of the iris code is at a position where the reflection of the illumination occurs. When it is determined that the position of the reflection of the illumination is determined, the reflection of the illumination is determined. 8. The iris authentication device according to claim 7, wherein the iris code is replaced with a bit of another iris code that does not occur.