Confidence Measures for an Address Reading System

  • Authors:
  • Anja Brakensiek;Jörg Rottland;Gerhard Rigoll

  • Affiliations:
  • -;-;-

  • Venue:
  • ICDAR '03 Proceedings of the Seventh International Conference on Document Analysis and Recognition - Volume 1
  • Year:
  • 2003

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Abstract

In this paper the performance of different confidencemeasures used for an address recognition system are evaluated.The recognition system for cursive handwritten Germanaddress words is based on Hidden Markov Models(HMMs). It is essential, that the structure of the address(name, street, city, country) is known, so that a specificsmall but complete dictionary can be selected. Choosinga wrong dictionary (OOV: out-of-vocabulary) or misrecognizethe word, the recognition result should be rejected bymeans of the confidence measure. This paper points out twoaspects: the comparison of four confidence measures forsingle words - based on the likelihood, a garbage-model,a two-best recognition or a character decoding - and thecomparison of using complete or wrong dictionaries. It isshown, that the best confidence measure - the two-best distance- has a quite different behavior using OOV.