Color by Numbers: Interactive Structuring and Vectorization of Sketch Imagery

International audienceWe present a novel, interactive interface for the integrated cleanup,neatening, structuring and vectorization of sketch imagery. Converting scanned raster drawings into vector illustrations is a wellresearched set of problems. Our approach is based on a Delaunaysubdivision of the raster drawing. We algorithmically generate acolored grouping of Delaunay regions that users interactively refineby dragging and dropping colors. Sketch strokes defined as markingboundaries of different colored regions are automatically neatenedusing Bézier curves, and turned into closed regions suitable forfills, textures, layering and animation. We show that minimal userinteraction using our technique enables better sketch vectorizationthan state of art automated approaches. A user study, further showsour interface to be simple, fun and easy to use, yet effectively ableto process messy images with a mix of construction lines, noisyand incomplete curves, sketched with arbitrary stroke style