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A new algorithm for text recognition that corrects character substitution errors in words of text is presented. The search for a correct word effectively integrates three knowledge sources: channel characteristics, bottom-up context, and top-down context. Channel characteristics are used in the form of probabilities that observed letters are corruptions of other letters; bottom-up context is in the form of the probability of a letter when the previous letters of the word are known; and top-downdoi:10.1145/357423.357428 fatcat:ssrlio6rajfk7imyz4usjkljsm