Patent ID: 8340361
Filing Date: 2012-12-25
Classification: G06K

Abstract:
1. A biometric authentication system comprising: a database holding enrolled feature data with respect to each of enrolled users u each time biometric data is inputted from a claimant v, a feature extraction unit for extracting feature data of the claimant v based on the biometric data acquired from the claimant v; a prior probability setting unit for setting prior probabilities of the enrolled users u a 1:N matching unit for performing 1:N matching between the extracted claimant feature data of the claimant and the enrolled feature data held in the database and calculating a matching score of each of the enrolled users u a likelihood ratio calculation unit for calculating a ratio of the likelihood v=u a posterior probability calculation unit for calculating posterior probabilities of the enrolled users u a determination unit for comparing each of the calculated posterior probabilities with a first threshold, when a maximum value of the posterior probability is larger than the first threshold, and when the posterior probability showing the maximum value is one of the posterior probabilities of the enrolled users u