PASCAL - Pattern Analysis, Statistical Modelling and Computational Learning

Addressing Missing Values in Kernel-based Multimodal Biometric Fusion using Neutral Point Substitution
Norman Poh and David Windridge
IEEE Trans. on Information Forensics and Security 2010.


In multimodal biometric information fusion, it is common to encounter missing modalities in which matching cannot be performed. As a result, at the match score level, this implies that scores will be missing. We address the multimodal fusion problem involving missing modalities (scores) using support vector machines with the Neutral Point Substitution (NPS) method. The approach starts by processing each modality using a kernel. When a modality is missing, at the kernel level, the missing modality is substituted by one that is unbiased with regards to the classification, called a neutral point. Critically, unlike conventional missing-data substitution methods, explicit calculation of neutral points may be omitted by virtue of their implicit incorporation within the SVM training framework. Experiments based on the publicly available Biosecure DS2 multimodal (scores) data set shows that the SVM-NPS approach achieves very good generalization performance compared to the sum rule fusion, especially with severe missing modalities. Index

EPrint Type:Article
Project Keyword:Project Keyword UNSPECIFIED
Subjects:Computational, Information-Theoretic Learning with Statistics
Learning/Statistics & Optimisation
Multimodal Integration
Theory & Algorithms
ID Code:8103
Deposited By:David Windridge
Deposited On:18 April 2011