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Francisco Alvaro, Joan-Andreu Sánchez, José-Miguel Benedí. Recognition of Printed Mathematical Expressions Using Two-dimensional Stochastic Context-Free Grammars. International Conference on Document Analysis and Recognition (ICDAR), 2011. pp. 1225-1229.

In this work, a system for recognition of printed mathematical expressions has been developed. Hence, a statistical framework based on two-dimensional stochastic context-free grammars has been defined. This formal framework allows to jointly tackle the segmentation, symbol recognition and structural analysis of a mathematical expression by computing its most probable parsing. In order to test this approach a reproducible and comparable experiment has been carried out over a large publicly available (InftyCDB-1) database. Results are reported using a well-defined global dissimilitude measure. Experimental results show that this technique is able to properly recognize mathematical expressions, and that the structural information improves the symbol recognition step.