Automatic single-line drawing creation from a paper-based overtraced freehand sketch

• Published in: International journal of advanced manufacturing technology Vol. 59; no. 1-4; pp. 221 - 242
• Main Authors: Chansri, Natthavika, Koomsap, Pisut
• Format: Journal Article
• Language: English
• Published: London Springer-Verlag 01.03.2012; Springer Nature B.V
• Subjects: Algorithms; CAE) and Design; Computer-Aided Engineering (CAD; Data points; Engineering; Industrial and Production Engineering; Mechanical Engineering; Media Management; Original Article; Reconstruction; Three dimensional models; Geometrical reconstruction; Single-line drawing; Segments identification and connection; Sketch-based modeling; Paper-based overtraced freehand sketch
• ISSN: 0268-3768; 1433-3015
• DOI: 10.1007/s00170-011-3487-z

Freehand sketching on a paper is commonly found to be used as it is a natural and intuitive communication channel for portraying ideas. Additional strokes are often drawn over the existing ones to make the sketch clearer. For its usefulness in subsequent steps, a sketch is transformed to be a 3D CAD model that is typically performed manually by a designer due to a lack of technology support. Geometrical reconstruction from an offline scanning of a sketch has been a challenge because enriched information obtained during sketching is reduced to a batch of data points. This paper presents an algorithm for identifying a single-line drawing from a paper-based overtraced sketch as it is the first important step towards geometrical reconstruction. Key activities in this approach are thick-line sketch creation, contour boundary extraction, segments identification, and line drawing creation. The algorithm has been successfully implemented on LabVIEW and tested with several samples.