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Proceedings Paper

Combined use of a priori data for fast system self-calibration of a non-rigid multi-camera fringe projection system
Author(s): Petros I. Stavroulakis; Shuxiao Chen; Danny Sims-Waterhouse; Samanta Piano; Nicholas Southon; Patrick Bointon; Richard Leach
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Paper Abstract

In non-rigid fringe projection 3D measurement systems, where either the camera or projector setup can change significantly between measurements or the object needs to be tracked, self-calibration has to be carried out frequently to keep the measurements accurate1. In fringe projection systems, it is common to use methods developed initially for photogrammetry for the calibration of the camera(s) in the system in terms of extrinsic and intrinsic parameters. To calibrate the projector(s) an extra correspondence between a pre-calibrated camera and an image created by the projector is performed. These recalibration steps are usually time consuming and involve the measurement of calibrated patterns on planes, before the actual object can continue to be measured after a motion of a camera or projector has been introduced in the setup and hence do not facilitate fast 3D measurement of objects when frequent experimental setup changes are necessary. By employing and combining a priori information via inverse rendering, on-board sensors, deep learning and leveraging a graphics processor unit (GPU), we assess a fine camera pose estimation method which is based on optimising the rendering of a model of a scene and the object to match the view from the camera. We find that the success of this calibration pipeline can be greatly improved by using adequate a priori information from the aforementioned sources.

Paper Details

Date Published: 26 June 2017
PDF: 12 pages
Proc. SPIE 10330, Modeling Aspects in Optical Metrology VI, 1033006 (26 June 2017); doi: 10.1117/12.2269302
Show Author Affiliations
Petros I. Stavroulakis, The Univ. of Nottingham (United Kingdom)
Shuxiao Chen, The Univ. of Nottingham (United Kingdom)
Danny Sims-Waterhouse, The Univ. of Nottingham (United Kingdom)
Samanta Piano, The Univ. of Nottingham (United Kingdom)
Nicholas Southon, The Univ. of Nottingham (United Kingdom)
Patrick Bointon, The Univ. of Nottingham (United Kingdom)
Richard Leach, The Univ. of Nottingham (United Kingdom)

Published in SPIE Proceedings Vol. 10330:
Modeling Aspects in Optical Metrology VI
Bernd Bodermann; Karsten Frenner; Richard M. Silver, Editor(s)

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