Dimosthenis Karatzas


Journal Publication

Rotation Invariant Hand-drawn Symbol Recognition based on a Dynamic Time Warping Model

A. Fornes, J. Llados, G. Sanchez and D. Karatzas

International Journal on Document Analysis and Recognition, Vol. 13, Num. 3, pp. 229-241, 2010

[Impact Factor: 1,21 / 3rd (Computer Science, Artificial Intelligence)]


One of the major difficulties of handwriting symbol recognition is the high variability among symbols because of the different writer styles. In this paper, we introduce a robust approach for describing and recognizing handdrawn symbols tolerant to these writer style differences. This method, which is invariant to scale and rotation, is based on the dynamic time warping (DTW) algorithm. The symbols are described by vector sequences, a variation of the DTW distance is used for computing the matching distance, and K-Nearest Neighbor is used to classify them. Our approach has been evaluated in two benchmarking scenarios consisting of hand-drawn symbols. Compared with state-of-the-art methods for symbol recognition, our method shows higher tolerance to the irregular deformations induced by handdrawn strokes.

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