26 May 2011 Optical measurement and comparison of large free form surfaces through a regular mesh
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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.
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Tiago L. Pinto, Tiago L. Pinto, Christian Kohler, Christian Kohler, Armando Albertazzi, Armando Albertazzi, "Optical measurement and comparison of large free form surfaces through a regular mesh", Proc. SPIE 8082, Optical Measurement Systems for Industrial Inspection VII, 80821A (26 May 2011); doi: 10.1117/12.889526; https://doi.org/10.1117/12.889526
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