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An Integrated Algorithm for Text Recognition: Comparison with a Cascaded Algorithm

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3 Author(s)
Hull, J.J. ; Department of Computer Science, State University of New York at Buffalo, Amherst, NY 14226. ; Srihari, S.N. ; Choudhari, Ramesh

The use of diverse knowledge sources in text recognition and in correction of letter substitution errors in words of text is considered. Three knowledge sources are defined: channel characteristics as probabilities that observed letters are corruptions of other letters, bottom-up context as letter conditional probabilities (when the previous letters of the word are known), and top-down context as a lexicon. Two algorithms, one based on integrating the knowledge sources in a single step and the other based on sequentially cascading bottom-up and top-down processes, are compared in terms of computational/storage requirements and results of experimentation.

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Pattern Analysis and Machine Intelligence, IEEE Transactions on  (Volume:PAMI-5 ,  Issue: 4 )