Dynamic Score Selection for Fusion of Multiple Biometric Matchers

TitleDynamic Score Selection for Fusion of Multiple Biometric Matchers
Publication TypeConference Paper
Year of Publication2007
AuthorsTronci, R, Giacinto, G, Roli, F
Conference Name14th IEEE International Conference on Image Analysis and Processing ICIAP 2007
Conference LocationModena, Italy
Keywordsbio00, biometry, mca01, mcs00, multimodal biometric, ROC, score, selection

A biometric system for user authentication produces a matching score representing the degree of similarity of the input biometry with the set of templates for that user. If the score is greater than a prefixed threshold, then the user is accepted, otherwise the user is rejected. Typically the performance are evaluated in terms of the Receiver Operating Characteristic (ROC) curve, and the Equal Error Rate (EER). In order to increase the reliability of authentication through biometrics, the combination of different biometric systems is currently investigated by researchers. While a number of "fusion" algorithms have been proposed in the literature, in this paper we propose a theoretical analysis of a novel approach based on the "dynamic selection" of matching scores. Such a selector aims at choosing, for each user to be authenticated, just one of the scores produced by the different biometric systems available. We show that the "dynamic selection" of matching scores can provide a better ROC than those of individual biometric systems. Reported results on the FVC2004 dataset confirm the theoretical analysis, and show that the proposed "dynamic selection" approach is more effective when low quality scores are used.

Citation Key 163