In this paper, the author describes an early processing system to be used as the basis for higher level sketch understanding. The system consists of three processing steps: approximation, beautification, and basic recognition. The system described allowed users to enter free-hand strokes in a sketch based input system without the need to switch between drawing modes. Previous works required that a user somehow notify the system whether a line, curve, or arc was being drawn.
Discussion
This paper introduces an interesting method of detecting corners in sketched inputs. Instead of relying only on curvature data as some previous works, this system employed a combination of curvature and speed data to determine the most likely locations of corners. This new method helped the authors successfully distinguish between different stroke components and implement the rest of their system. Recognizing the basic geometric components of a sketch is a valuable addition for almost all areas of study in which one might use a sketch based interface.
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