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Proceedings of CAD'15, 2015, 395-397
Improving Medial Surfaces for Reverse Engineering

Vaibhav Kumar, AMADA
Takashi Michikawa, Osaka University
Hiromasa Suzuki, The University of Tokyo

Abstract. The goal of this research is to compute CAD models of thin-plate objects (like automobile bodies, plastic injection mold components, sheet metals or welded parts etc.) from their CT images by using medial axes. Medial axis (medial surface in 3D) is a shape descriptor of the solid models by the center-line of the object. The medial axis has various applications including shape animation, shape analysis and so on. Created CAD models of “real objects” are useful in reverse engineering applications including product quality control and shortening development time. It will also be helpful in dimensional reduction, reducing computational complexity in finite element analysis, and other analyses and simulations. We can find several work on medial axis transform (MAT) in 2D and 3D images, however these approaches have two issues for the applications to reverse engineering. First issue is the medial axis is shrunk at the end point. Second issue is that dents appear at the junctions. These problems are due to the definition of the medial axis and they should be resolved for reverse engineering applications.  For CAD models, mid-surface introduced to resolve these issues, however it is difficult to apply them to the polygonal meshes from CT images.

Keywords. Medial surfaces, Medial axis transforms, Reverse engineering, Shrinkage, Dent structure

DOI: 10.14733/cadconfP.2015.395-397