Augmenting the Discrimination Power of HMM by NN for On-Line Cursive Script Recognition

  • Authors:
  • Seung-Ho Lee;Jin H. Kim

  • Affiliations:
  • Department of Computer Science, Korea Advanced Institute of Science and Technology, 373-1, Kusong-dong, Yusong-gu, Taejon, 305-701, Korea. E-mail: shlee@boramai.kaist.ac.kr, jkim@cs. ...;Department of Computer Science, Korea Advanced Institute of Science and Technology, 373-1, Kusong-dong, Yusong-gu, Taejon, 305-701, Korea. E-mail: shlee@boramai.kaist.ac.kr, jkim@cs. ...

  • Venue:
  • Applied Intelligence
  • Year:
  • 1997

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Abstract

For on-line handwriting recognition, a hybrid approach that combinesthe discrimination power of neural networks with the temporalstructure of hidden Markov models is presented. Initially, allplausible letter components of an input pattern are detected by usinga letter spotting technique based on hidden Markov models. A wordhypothesis lattice is generated as a result of the letter spotting.All letter hypotheses in the lattice are evaluated by a neuralnetwork character recognizer in order to reinforce letterdiscrimination power. Then, as a new technique, an island-drivenlattice search algorithm is performed to find the optimal path on theword hypothesis lattice which corresponds to the most probable wordamong the dictionary words. The results of this experiment suggestthat the proposed framework works effectively in recognizing Englishcursive words. In a word recognition test, on average 88.5% wordaccuracy was obtained.