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Between-Source Modelling for Likelihood Ratio Computation in Forensic Biometric Recognition

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Audio- and Video-Based Biometric Person Authentication (AVBPA 2005)

Abstract

In this paper, the use of biometric systems in forensic applications is reviewed. Main differences between the aim of commercial biometric systems and forensic reporting are highlighted, showing that commercial biometric systems are not suited to directly report results to a court of law. We propose the use of a Bayesian approach for forensic reporting, in which the forensic scientist has to assess a meaningful value, in the form of a likelihood ratio (LR). This value assist the court in their decision making in a clear way, and can be computed using scores coming from any biometric system, with independence of the biometric discipline. LR computation in biometric systems is reviewed, and statistical assumptions regarding estimations involved in the process are addressed. The paper is focused in handling small sample size effects in such estimations, presenting novel experiments using a fingerprint and a voice biometric system.

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© 2005 Springer-Verlag Berlin Heidelberg

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Ramos-Castro, D., Gonzalez-Rodriguez, J., Champod, C., Fierrez-Aguilar, J., Ortega-Garcia, J. (2005). Between-Source Modelling for Likelihood Ratio Computation in Forensic Biometric Recognition. In: Kanade, T., Jain, A., Ratha, N.K. (eds) Audio- and Video-Based Biometric Person Authentication. AVBPA 2005. Lecture Notes in Computer Science, vol 3546. Springer, Berlin, Heidelberg. https://doi.org/10.1007/11527923_112

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  • DOI: https://doi.org/10.1007/11527923_112

  • Publisher Name: Springer, Berlin, Heidelberg

  • Print ISBN: 978-3-540-27887-0

  • Online ISBN: 978-3-540-31638-1

  • eBook Packages: Computer ScienceComputer Science (R0)

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