(PDF) Formulae | Kapil Kothandapani

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Abstract

Useful Formulae

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The goal of this survey is to give a classification of problems the recognition of mathematical formulae focuses on and a taxonomy of methods that are used to accomplish the recognition. Recognition of mathematical formulae can be basically divided into two groups: off-line recognition and on-line recognition. By off-line recognition we mean recognition of scanned formulae. In this case, the input is a picture -a two-dimensional array of pixels. Scanned pictures typically contain printed formulae, but handwritten expressions can be considered as well. This method is assumed to be applied to convert printed mathematical texts into an electronic form. On the other hand, on-line recognition is connected to pen-based computing technologies like electronic tablets. The input is a sequence of strokes. Elements of the sequence are sorted by the time of creation. Each stroke is a sequence of points written by one move of the pen. Since the pen is driven by hand, on-line recognition focuses on handwritten formulae.

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