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Communication Dans Un Congrès Année : 1997

Optical formula recognition

Résumé

This paper describes the design and the first steps of implementation of Ofr (Optical Formula Recognition), a system for extracting and understanding mathematical expressions in printed documents. Our approach clearly separate OCR step, geometrical treatments and syntactic analysis. In this paper we focus on the third part: we define a class of context-sensitive graph grammars for mathematical formulas, study their properties and show how to remove their ambiguities (by adding contexts in rules) to define efficient parsing. This method is based on a " critical pairs " approach in the sense of Knuth-Bendix algorithm.
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Dates et versions

hal-00564638 , version 1 (09-02-2011)
hal-00564638 , version 2 (27-07-2016)

Licence

Paternité - Pas d'utilisation commerciale - Pas de modification

Identifiants

Citer

Stéphane Lavirotte, Loïc Pottier. Optical formula recognition. International Conference on Document Analysis and Recognition, Aug 1997, Ulm, Germany. ⟨10.1109/ICDAR.1997.619871⟩. ⟨hal-00564638v2⟩

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