University of Bologna

Dipartimento di Elettronica, Informatica e Sistemistica

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A System for Machine-Written and Hand-Written Character Distinction

K. Kuhnke and L. Simoncini and Zs. M. Kovacs-V.


In applications of character recognition where machine-printed and hand-written characters are involved, it is important to know if the character image, or the whole word, is machine- or hand-written. This is due to the accuracy difference between the algorithms and systems oriented to machine- or hand-written characters. Obviously, this type of knowledge leads to the increase of the overall system quality. In this work a classification system is presented which reads a raster image of a character and outputs two confidence values, one for ``machine-written'' and one for ``hand-written'' character classes, respectively. The proposed system features a preprocessing step, which transforms a general uncentered character image into a normalized form, then the feature extraction phase extracts relevant information from the image, and at the end, a standard classifier based on a feed-forward neural network creates the final response. At the end, some results on a proprietary image database are reported.

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