FINGERPRINT AUTHENTICATION SYSTEM, FINGERPRINT AUTHENTICATION METHOD, AND FINGERPRINT AUTHENTICATION PROGRAM
First Claim
1. A fingerprint authentication system comprising:
- an image division unit that divides a captured image of an authentication subject to be subjected to fingerprint authentication into a plurality of small regions;
a frequency analysis unit that performs a frequency analysis on each of the small regions;
a ridge candidate extraction unit that extracts frequency components corresponding to ridge candidates in the small regions from frequency components obtained in the frequency analysis;
a continuous ridge candidate group generation unit that compares the ridge candidates between adjacent small regions, and when the ridge candidates satisfy a condition enabling the ridge candidates to be determined continuous, generates a continuous ridge candidate group including the ridge candidates; and
a determination unit that determines that an abnormality exists in the image when overlap exists between the image regions corresponding to the continuous ridge candidate group.
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Accused Products
Abstract
To improve the precision with which a false finger formed by attaching a transparent thin film to a surface of a finger is identified, a fingerprint authentication system includes: an image division unit 31 that divides a captured image of an authentication subject to be subjected to fingerprint authentication into a plurality of small regions; a frequency analysis unit 32 that performs a frequency analysis on each of the small regions; a ridge candidate extraction unit 33 that extracts frequency components corresponding to ridge candidates in the small regions from frequency components obtained in the frequency analysis; a continuous ridge candidate group generation unit 34 that compares the ridge candidates between adjacent small regions, and when the ridge candidates satisfy a condition enabling the ridge candidates to be determined continuous, generates a continuous ridge candidate group including the ridge candidates; and a determination unit 35 that determines that an abnormality exists in the image when overlap exists between the image regions corresponding to the continuous ridge candidate group.
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Citations
9 Claims
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1. A fingerprint authentication system comprising:
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an image division unit that divides a captured image of an authentication subject to be subjected to fingerprint authentication into a plurality of small regions; a frequency analysis unit that performs a frequency analysis on each of the small regions; a ridge candidate extraction unit that extracts frequency components corresponding to ridge candidates in the small regions from frequency components obtained in the frequency analysis; a continuous ridge candidate group generation unit that compares the ridge candidates between adjacent small regions, and when the ridge candidates satisfy a condition enabling the ridge candidates to be determined continuous, generates a continuous ridge candidate group including the ridge candidates; and a determination unit that determines that an abnormality exists in the image when overlap exists between the image regions corresponding to the continuous ridge candidate group. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A fingerprint authentication method comprising the steps of:
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dividing a captured image of an authentication subject to be subjected to fingerprint authentication into a plurality of small regions; performing a frequency analysis on each of the small regions; extracting frequency components corresponding to ridge candidates in the small regions from frequency components obtained in the frequency analysis; comparing the ridge candidates between adjacent small regions, and when the ridge candidates satisfy a condition enabling the ridge candidates to be determined continuous, generating a continuous ridge candidate group including the ridge candidates; and determining that an abnormality exists in the image when overlap exists between the image regions corresponding to the continuous ridge candidate group. - View Dependent Claims (9)
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Specification