CAD-based range sensor placement for optimum 3D data acquisition

Authors:
F. Prieto;T. Redarce;P. Boulanger;R. Lepage
Affiliations:
INSA, Laboratoire d' Automatique Industrielle, Villeurbanne Cedex, France and ÉTS, Laboratoire d'Imagerie, de Vision et d'Intelligence Artificielle, Montréal, Québec, Canada;INSA, Laboratoire d' Automatique Industrielle, Villeurbanne Cedex, France;NRCC, Institute for Information Technology, Ottawa, Ontario, Canada;ÉTS, Laboratoire d'Imagerie, de Vision et d'Intelligence Artificielle, Montréal, Québec, Canada
Venue:
3DIM'99 Proceedings of the 2nd international conference on 3-D digital imaging and modeling
Year:
1999

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Abstract

The use of laser range sensor allows very significant improvement in acquisition speed but does not equal the accuracy obtained with a coordinate measuring machine. In order to obtain a quality control close to that obtained in metrology, we suggest to improve the accuracy of the depth measurements by positioning the sensor's head according to a strategy for optimum 3D data acquisition. We propose in this paper such a strategy to automatically produce a sensing plan for completely and accurately acquiring the geometry of a surface or of the whole piece whenever possible. The system requires the exact position and orientation of the part and its CAD model in IGES format. There is no limitation regarding the shape of the part to be digitized. An auto-synchronized range sensor developed at the NRCC was used, and for this sensor, the accuracy of the 3D measured points is a function of the distance and of the incident angle relative to the surface. Our strategy guaranties that the viewpoints found meet the best accuracy conditions in the scanning process.