Freehand sketch on a piece of paper is a quick rough drawing for portraying ideas, and commonly used during a conversation to elaborate an explanation. Overlapping lines provide additional information to make the rough sketch clearer, but the overtraced sketch should be simplified first to a single line drawing to be useful for downstream processes (e.g., input for generating 2D tool paths or for constructing 3D model). Presented in this paper is a new approach for identifying a single line drawing from a paper-based overtraced freehand sketch. Key activities in this approach are thick line sketch creation, boundary extraction, contour expansion and shrink, and line drawing creation. The current stage of its implementation is also reported in this paper.
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