ID3-derived fuzzy rules and optimized defuzzification for handwritten numeral recognition

Zheru Chi, Hong Yan

Research output: Journal article publicationJournal articleAcademic researchpeer-review

41 Citations (Scopus)


In this paper, we present a technique to produce fuzzy rules based on the ID3 approach and to optimize defuzzification parameters by using a two-layer perceptron. The technique overcomes the difficulties in a conventional syntactic approach to handwritten character recognition, including problems of choosing a starting or reference point, scaling, and learning by machines. Our technique provides us with: a way to produce meaningful and simple fuzzy rules; a method to fuzzify ID3-derived rules to deal with uncertain, noisy, or fuzzy data; and a framework to incorporate fuzzy rules learned from the training data and those extracted from human recognition experience. Our experimental results on NIST Special Database 3 show that the technique out-performs the straight forward ID3 approach. Moreover, ID3-derived fuzzy rules can be combined with an optimized nearest neighbor classifier, which uses intensity features only, to achieve a better classification performance than either of the classifiers. The combined classifier achieves a correct classification rate of 98.6% on the test set.
Original languageEnglish
Pages (from-to)24-31
Number of pages8
JournalIEEE Transactions on Fuzzy Systems
Issue number1
Publication statusPublished - 1 Dec 1996

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Electrical and Electronic Engineering
  • Artificial Intelligence


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