filename : Nor12.pdf entry : journal conference : pages : 2516-2527 year : 2012 month : December title : Smart Scribbles for Sketch Segmentation subtitle : author : Noris, G. and Sykora, D. and Shamir, A. and Coros, S. and Whited, B. and Simmons, M. and Hornung, A. and Gross, M. and Sumner, R. booktitle : Computer Graphics Forum ISSN/ISBN : 1467-8659 editor : publisher : Blackwell Publishing Ltd publ.place : volume : 31 issue : 8 language : English keywords : digital sketches, interactive segmentation, scribble-based user interface, energy minimization abstract : We present 'Smart Scribbles'-a new scribble-based interface for user-guided segmentation of digital sketchy drawings. In contrast to previous approaches based on simple selection strategies, Smart Scribbles exploits richer geometric and temporal information, resulting in a more intuitive segmentation interface. We introduce a novel energy minimization formulation in which both geometric and temporal information from digital input devices is used to define stroke-to-stroke and scribble-to-stroke relationships. Although the minimization of this energy is, in general, an NP-hard problem, we use a simple heuristic that leads to a good approximation and permits an interactive system able to produce accurate labellings even for cluttered sketchy drawings. We demonstrate the power of our technique in several practical scenarios such as sketch editing, as-rigid-as-possible deformation and registration, and on-the-fly labelling based on pre-classified guidelines.