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Proceedings Paper

High-speed and noncontact validation of rapid prototyping parts
Author(s): Pierre Boulanger; Veronique Moron; Tanneguy Redarce
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Paper Abstract

A new automated inspection algorithm of rapid prototyping parts using a 3D laser range sensor is described. The input to the program is a series of trimmed NURBS saved in an IGES format or an STL file and an unordered series of measurements produced by a 3D optical sensor. The output is an inspection report indicating the level of discrepancy between the measured points and the model. Using a color scheme, an operator can rapidly identify problems in the rapid prototyping process and validate if the produced part is conform the intended design. At the base of the method, a new robust correspondence algorithm which can find the rigid transformation between the tessellated model of the part and the measured points, is presented. This method is based on a least median square norm capable of a robustness of up to 50 percent. The robustness of the method is essential since one cannot guarantee that in practice, all the points in the measured set belong to the model. These types of algorithms are usually quite costly in computational complexity, but we will show that one can speed-up these algorithms by using the well-known iterative closest points algorithm and a multi-resolution scheme based on planar surface tessellation and voxels.

Paper Details

Date Published: 9 January 1997
PDF: 15 pages
Proc. SPIE 2910, Rapid Product Development Technologies, (9 January 1997); doi: 10.1117/12.263358
Show Author Affiliations
Pierre Boulanger, National Research Council Canada (Canada)
Veronique Moron, National Institute for Applied Sciences (France)
Tanneguy Redarce, National Institute for Applied Sciences (France)

Published in SPIE Proceedings Vol. 2910:
Rapid Product Development Technologies
Pierre Boulanger, Editor(s)

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