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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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:
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dividing a captured image of an authentication subject, via an image division unit, to be subjected to fingerprint authentication into a plurality of small regions; performing a frequency analysis, via a frequency analysis unit, on each of the small regions; extracting frequency components, via a ridge candidate extraction unit, corresponding to ridge candidates in the small regions from frequency components obtained in the frequency analysis; comparing the ridge candidates between adjacent small regions, via a continuous ridge candidate group generation unit, 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, via a determination unit, when overlap exists between the image regions corresponding to the continuous ridge candidate group; wherein one or more of the image division unit, the frequency analysis unit, the ridge candidate extraction unit, the continuous ridge candidate group generation unit, and the determination unit are implemented by a CPU. - View Dependent Claims (9)
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Specification