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Experimental comparison of laser speckle projection and array projection for high-speed 3D measurements

: Heist, Stefan; Lutzke, Peter; Dietrich, Patrick; Kühmstedt, Peter; Notni, Gunther


Lehmann, P. ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
Optical Measurement Systems for Industrial Inspection IX : 22-25 June 2015, Munich, Germany
Bellingham, WA: SPIE, 2015 (Proceedings of SPIE 9525)
ISBN: 978-1-62841-685-5
Paper 952515, 8 S.
Conference "Optical Measurement Systems for Industrial Inspection" <9, 2015, Munich>
Fraunhofer IOF ()

In many application areas, stereo vision-based active triangulation systems are used to reconstruct the three-dimensional (3-D) surface shape of measurement objects. Typically, in order to solve the correspondence problem and increase the accuracy of the pixel assignment, a sequence of patterns is projected onto the object's surface and simultaneously recorded by two cameras. Most 3-D measurement systems are limited to static objects. In order to enhance their speed, it is necessary to use fast cameras as well as fast projection systems. Although high-speed camera systems are available, pattern projection at high frame rates is a difficult task and only a few techniques exist at the moment. In this contribution, we compare two different projection approaches, a laser-based speckle projection unit and an LED-based multi-aperture projection system, with regard to the achievable point cloud completeness and accuracy.