EP0650137A2
Expired / Lapsed
EP
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An apparatus for fingerprint verification
Assignee: NEC Corp
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Filing: 1994-10-06
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Granted: —
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Expires: 2014-10-06
Abstract
Abstract Feature points data and quality grade data of fingerprint images are stored in a data base with register number of each fingerprint as an index for access. A verification method dictionary contains different verification methods for different quality grades. A verifier unit refers to the verification method dictionary to select a verification method adapted for the quality grade of a fingerprint to be compared.
Inventors
- 👤 Masanori C/O Nec Security Syst. Ltd. Hara
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 17:20
CPC Classifications
G; G07; G07C; G07C9/00; G07C9/30; G07C9/32; G07C9/37; G06; G06V; G06V40/00; G06V40/10; G06V40/12; G06V40/1365
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
202 words
An apparatus for fingerprint verification comprising: a data base (34) wherein feature points data of fingerprints to be verified are registered with respective register number of each fingerprint as an index for access, a register number input unit (2) for generating the register number of a fingerprint to be compared, a fingerprint image input unit (1) for generating a fingerprint image of said fingerprint to be compared, a feature points extraction unit (32) for extracting feature points data of said fingerprint image from said fingerprint image input unit, and a verifier unit (36) for comparing said feature points data and the feature points data read out from said data base accessed by said register number from said register number input unit; characterized in that: quality grade data of fingerprints to be verified are further registered in said data base with respective register number of fingerprint as an index for access, there are further provided a verification method dictionary (35) wherein different verification methods are assigned for different quality grade data, and said verifier unit refers to said verification method dictionary by the quality grade data read out from said data base to determine the verification method for said fingerprint to be compared.
Claim 2
Dependent Claim
64 words
An apparatus for fingerprint verification of claim 1, wherein a quality grade extraction unit (33) is further provided with for extracting quality grade of a fingerprint image; and said fingerprint image input unit, said register number input unit, said feature points extraction unit, and said quality grade extraction unit are used for registering feature points data and quality grade data in said data base.
Claim 3
Dependent Claim
33 words
An apparatus of claim 1 or 2, wherein said verification method dictionary contains different size of area from which feature points data are to be extracted for different quality grade of the fingerprint.
Claim 4
Dependent Claim
25 words
An apparatus of claim 1, 2, or 3, wherein said verification method dictionary contains different data of verification for different quality grade of the fingerprint.
Claim 5
Independent Claim
28 words
An apparatus of any one of claims 1 to 4, wherein said verification method dictionary contains different allowable range for comparison of different quality grade of the fingerprint.
Claim 6
Independent Claim
30 words
An apparatus of any one of claims 1 to 5, wherein said verification method dictionary contains different process of enhance of ridge lines of different quality grade of the fingerprint.
References Cited (Backward Citations)
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