An algorithm for the automatic identification of drawing tools based on the appearance of the stroke boundary is presented. The purpose of this stroke analysis is the determination of drawing tools in underdrawings - the basic concept of an artist - in ancient panel paintings. This information allows significant support for a systematic stylistic approach in the analysis of paintings. Up to now the identification of drawing tools is performed by an expert visually. Our tool will support the expert to investigate larger numbers of underdrawings, provides objective and reproducible information and simplifies comparison of different underdrawings. Stroke analysis in paintings is related to the extraction and recognition of handwritings, therefore similar techniques to stroke analysis are used. Following the segmentation, the approximation of the stroke boundary is done by active contours with different parameters. Deviations between a rigid and elastic "snake" are used as descriptive features for differentiation between drawing tools. Results of the algorithm are presented for sets of three different types of strokes.
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