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Proceedings Paper

Optical measurement and comparison of large free form surfaces through a regular mesh
Author(s): Tiago L. Pinto; Christian Kohler; Armando Albertazzi Jr.
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Paper Abstract

A portable optical measurement system, capable of measuring free form surfaces over large areas and comparing them with reference surfaces was developed within this work. The system merges passive and active stereo vision. Data is acquired in both modes for each partial overlapped position of the system, covering all the area of interest of the free form surface or part being measured. In passive stereo vision mode, circular targets are used to determine the coarse position of the system (i.e. cameras and projector) referenced to a global coordinate system defined by the targets. In active stereo vision mode, three-dimensional point clouds are locally measured and registered in the global coordinate system. The algorithm performs the calculation of these point clouds into a single intrinsically structured regular mesh, allowing an efficient comparison between different surfaces because the correspondence of points can be pre-defined. Experimental evaluations, using different kinds of geometric patterns and calibrated free form surfaces demonstrate the feasibility and the advantages of the proposed methods.

Paper Details

Date Published: 26 May 2011
PDF: 12 pages
Proc. SPIE 8082, Optical Measurement Systems for Industrial Inspection VII, 80821A (26 May 2011); doi: 10.1117/12.889526
Show Author Affiliations
Tiago L. Pinto, Univ. Federal de Santa Catarina (Brazil)
Christian Kohler, Univ. Stuttgart (Germany)
Armando Albertazzi Jr., Univ. Federal de Santa Catarina (Brazil)

Published in SPIE Proceedings Vol. 8082:
Optical Measurement Systems for Industrial Inspection VII
Peter H. Lehmann; Wolfgang Osten; Kay Gastinger, Editor(s)

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