University of Bologna

Dipartimento di Elettronica, Informatica e Sistemistica

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Massively-Parallel Hand-Written Character Recognition Based on the Distance Transform

Zs. M. Kovacs and R. Guerrieri


A new statistical classifier for hand-written character recognition is presented. After a standard preprocessing phase for image binarization and normalization, a distance transform is applied to the normalized image, converting a black and white (B/W) into a gray scale picture. The latter is used as feature space for a k-Nearest-Neighbor classifier, based on a dissimilarity measure which generalizes the use of the distance transform itself. The classifier has been implemented on a massively-parallel processor, Connection Machine CM-2. Classification results of digits extracted from the U.S. Post Office ZIP code database and the upper-case letters of the NIST Test Data 1 are provided. The system has an accuracy of 96.73% on the digits and 94.51% on the upper-case letters when no rejection is allowed and an accuracy of 98.96% on the digits and 98.72% on the upper-case letters at 1% error rate.

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