Abstract
This paper explores the effectiveness of an interaction model based on user-sketched line segments and curve segments, together known as sketch-lines. Directly sketching line segments on image slices, or curve segments on the surfaces of objects in volume rendered or surface rendered 3D data, is an effective means by which to quickly and simply transfer accurate information, such as position, object surface orientation, and surface region width, from the user to a visualization algorithm. This information can be used for fast, intuitive and precise object-relative image slice positioning and for precise, editable region of interest (ROI) delineation in a volume image. The results from two user studies are presented that analyze the efficiency, intuitiveness and precision of the sketch-line interaction model as well as quantitatively and qualitatively compare aspects of the model to other interaction techniques.
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