Markus Wuersch and Max J. Egenhofer, Perceptual Sketch Interpretation, in: A. Ruas and C.Gold (eds.), The 13th International Symposium on Spatial Data Handling (SDH 2008), Montpellier, France Springer, June 2008. An automated extraction of regions from sketches can be of great value for multi-modal user interfaces and for interpreting spatial data. This paper develops the Perceptual Sketch Interpretationalgorithm, which employs read more Perceptual Sketch Interpretation