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Towards a measure of biometric feature information

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Abstract

This paper develops an approach to measure the information content of a biometric feature representation. We define biometric information as the decrease in uncertainty about the identity of a person due to a set of biometric measurements. We then show that the biometric feature information for a person may be calculated by the relative entropy \({D(p\|q)}\) between the population feature distribution q and the person’s feature distribution p. The biometric information for a system is the mean \({D(p\|q)}\) for all persons in the population. In order to practically measure \({D(p\|q)}\) with limited data samples, we introduce an algorithm which regularizes a Gaussian model of the feature covariances. An example of this method is shown for PCA and Fisher linear discriminant (FLD) based face recognition, with biometric feature information calculated to be 45.0 bits (PCA), 37.0 bits (FLD) and 55.6 bits (fusion of PCA and FLD features). Finally, we discuss general applications of this measure.

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Authors and Affiliations

  1. Carleton University, Ottawa, ON, K1S 5B6, Canada

    Andy Adler

  2. University of Ottawa, Ottawa, ON, Canada

    Richard Youmaran & Sergey Loyka

Authors
  1. Andy Adler
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  2. Richard Youmaran
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  3. Sergey Loyka
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Correspondence to Richard Youmaran.

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Adler, A., Youmaran, R. & Loyka, S. Towards a measure of biometric feature information. Pattern Anal Applic 12, 261–270 (2009). https://doi.org/10.1007/s10044-008-0120-3

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  • DOI: https://doi.org/10.1007/s10044-008-0120-3

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