Segmentation of Pen Strokes Using Pen Speed.
Thomas F. Stahovich · 2004
We present a technique for segmenting pen strokes into lines and arcs. The technique uses pen speed infor-mation to help infer the segmentation intended by the drawer. To begin, a set of candidate segment points is identified. This set includes speed minima below a threshold computed from the average pen speed. It also includes curvature maxima at which the pen speed is again below a threshold. The ink between each pair of consecutive segment points is then classified as either a line or arc, depending on which fits best. Finally, a feedback process is employed, and segments are judi-ciously merged and split as necessary to improve the quality of the segmentation. Formal user studies were conducted, and our system was observed to perform ac-curately, even for new users.