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Reverse Engineering of Free-Form Objects: An Automatic Solution
Published June 19, 1997 by ISATA - Dusseldorf Trade Fair in United Kingdom
Event: ISATA 1997
The goal of reverse engineering is to create a CAD model of an existing physical workpiece. This paper presents an automatic method to measure with a 3D coordinate measuring machine a workpiece of which there is no CAD model available. The distribution of the measured points is determined during the measurement and is (3D)-curvature dependent: more points in highly curved areas and only a few points in flatter areas. This point distribution is optimal for the second part in the reverse engineering process: the modelling.
The paper also presents a new method to create NURBS surfaces from an unstructured cloud of measured points. A least squares method is used to smooth out noise or inaccuracies generated by a bad surface quality. The result is an accurate and smooth CAD model of the workpiece.
The research results are available through the software packages Surfeyor and Shapid of Metris N.V.