PASCAL - Pattern Analysis, Statistical Modelling and Computational Learning

Improving Fusion with Margin-Derived Confidence In Biometric Authentication Tasks
Norman Poh and Samy Bengio
In: Audio- and Video-based Biometric Person Authentication (AVBPA2005), 20-22 July 2005, New York.


This study investigates a new confidence criterion to improve fusion via a linear combination of scores of several biometric authentication systems. This confidence is based on the margin of making a decision, which answers the question, ``after observing the score of a given system, what is the confidence (or risk) associated to that given access?''. In the context of multimodal and intramodal fusion, such information proves valuable because the margin information can determine which of the systems should be given higher weights. Finally, we propose a linear discriminative framework to combine the margin information with an existing global fusion function. The results of 32 fusion experiments carried out on the XM2VTS multimodal database show that fusion using margin (product of margin and expert opinion) is superior over fusion without the margin information (i.e., the original expert opinion) . Furthermore, combining both sources of information increases fusion performance further.

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EPrint Type:Conference or Workshop Item (Paper)
Additional Information:biometric authentication fusion
Project Keyword:Project Keyword UNSPECIFIED
Subjects:Multimodal Integration
ID Code:865
Deposited By:Norman Poh
Deposited On:02 January 2005