Biometric authentication device, authentication accuracy evaluation device and biometric authentication method
First Claim
1. A biometric authentication device, comprising:
- a storage unit to store data indicating an initial-element generation probability of a blood vessel image, data indicating a branch probability of an element and data indicating a change coefficient or a change probability of the element, which are obtained by dividing a plurality of sets of a registration image and a verification image which indicate the blood vessel image of a living body into a plurality of respective elements;
a verification-image generation probability calculation unit to calculate an element generation probability of a focused-on element of a verification image to be authenticated, using the data indicating the generation probability of the initial element and the data indicating the branch probability which are stored in the storage unit and calculating a value obtained by multiplying the element generation probabilities of respective focused-on elements as a verification-image generation probability of the verification image to be authenticated;
a change probability calculation unit to calculate change probability of the change between the focused-on element of the verification image and the element of a registration image for a person to be authenticated, using the data indicating the change coefficient or the change probability which are stored in the storage unit and calculating a value obtained by multiplying the change probabilities of respective focused-on elements as a change probability of the verification image;
a dissimilarity or similarity calculation unit to calculate a degree of similarity or dissimilarity using the verification image generation probability and the change probability; and
an authentication unit to determine whether the verification image to be authenticated belongs to a registered person, in accordance with whether the degree of dissimilarity or similarity is more or less than a threshold.
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Abstract
A biometric authentication device includes a verification-image generation probability calculation unit for calculating a verification-image generation probability using a verification-image generation probability model, a change probability calculation unit for calculating a change probability of a set of a registration image and a verification image using a change probability model, a dissimilarity calculation unit for calculating the degree of dissimilarity on the basis of the verification-image generation probability and the change probability and an authentication unit for determining whether the verification image belongs to an authentication target by comparing the degree of dissimilarity with a predetermined authentication threshold.
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Citations
18 Claims
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1. A biometric authentication device, comprising:
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a storage unit to store data indicating an initial-element generation probability of a blood vessel image, data indicating a branch probability of an element and data indicating a change coefficient or a change probability of the element, which are obtained by dividing a plurality of sets of a registration image and a verification image which indicate the blood vessel image of a living body into a plurality of respective elements; a verification-image generation probability calculation unit to calculate an element generation probability of a focused-on element of a verification image to be authenticated, using the data indicating the generation probability of the initial element and the data indicating the branch probability which are stored in the storage unit and calculating a value obtained by multiplying the element generation probabilities of respective focused-on elements as a verification-image generation probability of the verification image to be authenticated; a change probability calculation unit to calculate change probability of the change between the focused-on element of the verification image and the element of a registration image for a person to be authenticated, using the data indicating the change coefficient or the change probability which are stored in the storage unit and calculating a value obtained by multiplying the change probabilities of respective focused-on elements as a change probability of the verification image; a dissimilarity or similarity calculation unit to calculate a degree of similarity or dissimilarity using the verification image generation probability and the change probability; and an authentication unit to determine whether the verification image to be authenticated belongs to a registered person, in accordance with whether the degree of dissimilarity or similarity is more or less than a threshold. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A biometric authentication device, comprising:
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a storage unit to store data indicating an initial-element generation probability of a blood vessel image, data indicating a branch probability of an element and data indicating a change coefficient or a change probability of the element, which is obtained by dividing a plurality of sets of a registration image and a verification image which indicate the blood vessel image of a living body into a plurality of respective elements; a registration-image virtual generation unit to generate a registration-image by virtually generating a plurality of elements using the data indicating the initial-element generation probability and data indicating the branch probability of the element, which are stored in the storage unit; a registration-image virtual generation probability calculation unit to calculate a registration-image virtual generation probability of the virtually generated registration image; a registration-image generation probability calculation unit to calculate a registration-image generation probability of a registration image; a first change probability calculation unit to calculate virtual change probabilities of the virtually generated registration image and the verification image; a verification-image generation probability calculation unit to calculate a verification-image generation probability using the registration-image generation probability, the registration-image virtual generation probability and the virtual change probability; a second change probability calculation unit to calculate a change probability of the registration image and the verification image to be authenticated; a dissimilarity or similarity calculation unit to calculate a degree of similarity or dissimilarity using the verification-image generation probability and the change probability; and an authentication unit to determine whether a verification image to be authenticated belongs to a registered person, in accordance with the degree of dissimilarity or similarity is more or less than a threshold. - View Dependent Claims (9, 10, 11)
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12. An authentication accuracy evaluation device, comprising:
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a storage unit to store data indicating an initial-element generation probability of a blood vessel image, data indicating a branch probability of an element and data indicating a change coefficient or a change probability of the element, which are obtained by dividing a plurality of sets of a registration image and a verification image which indicate the blood vessel image of a living body into a plurality of respective elements; a registration-image virtual generation unit to virtually generate a plurality of registration images using the data indicating the initial-element generation probability and the data indicating the branch probability which are stored in the storage unit; a verification-image virtual generation unit to virtually generate a plurality of verification images using the data indicating the initial-element generation probability, the data indicating the branch probability of an element and the data indicating the change coefficient or the change probability which are stored in the storage unit; a verification-image generation probability calculation unit to calculate a generation probability of the verification image; a change probability calculation unit to calculate change probability of the virtually generated registration image and the virtually generated verification image; a dissimilarity or similarity calculation unit to calculate a degree of similarity or dissimilarity using the verification image generation probability and the change probability; and an output unit to total a plurality of the degree of dissimilarity or similarity and to output data indicating authentication accuracy. - View Dependent Claims (13, 14)
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15. A biometric authentication method, comprising:
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storing data indicating an initial-element generation probability of a blood vessel image, data indicating a branch probability of an element and data indicating a change coefficient or a change probability of the element, which are obtained by dividing a plurality of sets of a registration image and a verification image which indicate the blood vessel image of a living body into a plurality of respective elements; calculating an element generation probability of a focused-on element of a verification image to be authenticated, using the data indicating the generation probability of the initial element and the data indicating the branch probability which are stored in the storage unit and calculating a value obtained by multiplying the element generation probabilities of respective focused-on elements as a verification-image generation probability of the verification image to be authenticated; calculating change probabilities of the focused-on element of the verification image and an element of a registration image of a person to be authenticated using the data indicating the change coefficient or the change probability which are stored in the storage unit and calculating a value obtained by multiplying the change probabilities of respective focused-on elements as a change probability of the verification image; calculating a degree of similarity or dissimilarity using the verification image generation probability and the change probability; and determining whether the verification image to be authenticated belongs to a registered person, in accordance with the degree of dissimilarity or similarity is more or less than a threshold. - View Dependent Claims (16)
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17. A biometric authentication method, comprising:
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storing data indicating an initial-element generation probability of a blood vessel image, data indicating a branch probability of an element and data indicating a change coefficient or a change probability of the element, which are obtained by dividing a plurality of sets of a registration image and a verification image which indicate the blood vessel image of a living body into a plurality of respective elements; virtually generating a registration image by virtually generating a plurality of elements using the data indicating the initial-element generation probability and the data indicating the branch probability of the element; calculating a registration-image virtual generation probability of the virtual registration image, calculating a registration-image generation probability of a registration image, calculating a virtual change probability of the registration image and the virtual registration image; calculating a verification-image generation probability using the registration-image generation probability, the registration-image virtual generation probability and the virtual change probability, calculating a change probability of the registration image and the verification image to be authenticated; calculating a degree of similarity or dissimilarity using the verification-image generation probability and the change probability; and determining whether a verification image to be authenticated belongs to a registered person, in accordance with the degree of dissimilarity or similarity is more or less than a threshold.
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18. An authentication accuracy evaluation method, comprising:
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storing data indicating an initial-element generation probability of a blood vessel image, data indicating a branch probability of an element and data indicating a change coefficient or a change probability of the element, which are obtained by dividing a plurality of sets of a registration image and a verification image which indicate the blood vessel image of a living body into a plurality of respective elements; virtually generating a plurality of registration images using the data indicating the generation probability of an initial element and the data indicating the branch probability which are stored in the storage unit; virtually generating a plurality of verification images using the data indicating the generation probability of the initial element, the data indicating the branch probability of the element and the data indicating the change coefficient or the change probability, which are stored in the storage unit; calculating a generation probability of a verification image; calculating change probabilities of the virtually generated registration image and the virtually generated verification image; calculating a degree of similarity or dissimilarity using the verification image generation probability and the change probability; and totaling a plurality of the degree of dissimilarity or similarity and generating data indicating authentication accuracy.
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Specification