The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 25, 2012
Filed:
Feb. 27, 2009
Biometric authentication system, authentication client terminal, and biometric authentication method
Takao Murakami, Yokohama, JP;
Kenta Takahashi, Kamakura, JP;
Takao Murakami, Yokohama, JP;
Kenta Takahashi, Kamakura, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A biometric authentication system, authentication client terminal, and biometric authentication method are provided to reduce an expected value of the number of inputs of biometric data for authentication, while effectively preventing forgery. In a biometric authentication system, prior probabilities of enrolled users uand non-enrolled user uare previously set. 1:N matching is performed between feature data of a claimant v and matching feature data. The matching score is calculated for each enrolled user u. A ratio of the likelihood v=uto the likelihood v≠uis calculated for each enrolled user uusing the calculated matching scores. Posterior probabilities of the enrolled users uand non-enrolled user uare calculated, using the likelihood ratios, and the prior probabilities of both the enrolled users uand the non-enrolled user u. Then, determination is made by comparing each posterior probability with a first threshold.