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3D shape measurement with phase correlation based fringe projection

: Kühmstedt, P.; Munkelt, C.; Heinze, M.; Bräuer-Burchardt, C.; Notni, G.


Osten, W.; Christophe Gorecki; Erik L. Novak ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
Optical Measurement Systems for Industrial Inspection V : 18 - 21 June 2007, Munich, Germany
Bellingham, WA: SPIE, 2007 (SPIE Proceedings Series 6616)
ISBN: 978-0-8194-6758-4
Paper 66160B, 9 S.
Conference "Optical Measurement Systems for Industrial Inspection" <2007, München>
Fraunhofer IOF ()

Here we propose a method for 3D shape measurement by means of phase correlation based fringe projection in a stereo arrangement. The novelty in the approach is characterized by following features. Correlation between phase values of the images of two cameras is used for the co-ordinate calculation. This work stands in contrast to the sole usage of phase values (phasogrammetry) or classical triangulation (phase values and image co-ordinates - camera raster values) for the determination of the co-ordinates.
The method's main advantage is the insensitivity of the 3D-coordinates from the absolute phase values. Thus it prevents errors in the determination of the co-ordinates and improves robustness in areas with interreflections artefacts and inhomogeneous regions of intensity. A technical advantage is the fact that the accuracy of the 3D co-ordinates does not depend on the projection resolution. Thus the achievable quality of the 3D co-ordinates can be selectively improved by the use of high quality camera lenses and can participate in improvements in modern camera technologies.
The presented new solution of the stereo based fringe projection with phase correlation makes a flexible, errortolerant realization of measuring systems within different applications like quality control, rapid prototyping, design and CAD/CAM possible. In the paper the phase correlation method will be described in detail. Furthermore, different realizations will be shown, i.e. a mobile system for the measurement of large objects and an endoscopic like system for CAD/CAM in dental industry.