False alarm rate: a critical performance measure for face recognition

  • Authors:
  • Jamie Sherrah

  • Affiliations:
  • Safehouse Technology Pty Ltd, Victoria, Australia

  • Venue:
  • FGR' 04 Proceedings of the Sixth IEEE international conference on Automatic face and gesture recognition
  • Year:
  • 2004

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Abstract

The performance of a face recognition algorithm is typically characterised by correct identification rate under the closed-world assumption. To be of greatest practical use, the closed-world assumption must be relaxed and the classifier used both for detection and identification. It is put forward that for open-world applications, the false alarm rate of the classifier is at least as important as the identification rate. Under a repeated verification model, all face recognisers exhibit a rapid non-linear increase in false alarm rate with the false alarm rate of the one-to-one verification used. If the one-to-one false alarm rate is not strictly controlled, the overall classifier will be all but unusable. A method is presented to predict the false alarm rate of a large gallery classifier using only a small data set. It is then shown that the false alarm error rate is always greater than the identification error rate. Therefore the false alarm rate is a more difficult criterion to minimise when designing a classifier.