Browsing by Author "Wessels, Tiaan"

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    Hidden Markov models for on-line signature verification
    (Stellenbosch : Stellenbosch University, 2002-12) Wessels, Tiaan; Omlin, C. W.; Stellenbosch University. Faculty of Science. Dept. of Mathematical Sciences (applied, computer, mathematics).
    ENGLISH ABSTRACT: The science of signature verification is concerned with identifying individuals by their handwritten signatures. It is assumed that the signature as such is a unique feature amongst individuals and the creation thereof requires a substantial amount of hidden information which makes it difficult for another individual to reproduce the signature. Modern technology has produced devices which are able to capture information about the signing process beyond what is visible to the naked eye. A dynamic signature verification system is concerned with utilizing not only visible, i.e. shape related information but also invisible, hidden dynamical characteristics of signatures. These signature characteristics need to be subjected to analysis and modelling in order to automate use of signatures as an identification metric. We investigate the applicability of hidden Markov models to the problem of modelling signature characteristics and test their ability to distinguish between authentic signatures and forgeries.