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Sensors 2016, 16(1), 13;

Underwater 3D Surface Measurement Using Fringe Projection Based Scanning Devices

Fraunhofer Institute Applied Optics and Precision Engineering, Albert-Einstein-Str. 7, D-07745 Jena, Germany
Technical University Ilmenau, Ehrenbergstraße 29, D-98693 Ilmenau, Germany
Author to whom correspondence should be addressed.
Academic Editors: Fabio Menna, Fabio Remondino and Hans-Gerd Maas
Received: 30 October 2015 / Revised: 11 December 2015 / Accepted: 18 December 2015 / Published: 23 December 2015
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In this work we show the principle of optical 3D surface measurements based on the fringe projection technique for underwater applications. The challenges of underwater use of this technique are shown and discussed in comparison with the classical application. We describe an extended camera model which takes refraction effects into account as well as a proposal of an effective, low-effort calibration procedure for underwater optical stereo scanners. This calibration technique combines a classical air calibration based on the pinhole model with ray-based modeling and requires only a few underwater recordings of an object of known length and a planar surface. We demonstrate a new underwater 3D scanning device based on the fringe projection technique. It has a weight of about 10 kg and the maximal water depth for application of the scanner is 40 m. It covers an underwater measurement volume of 250 mm × 200 mm × 120 mm. The surface of the measurement objects is captured with a lateral resolution of 150 μm in a third of a second. Calibration evaluation results are presented and examples of first underwater measurements are given. View Full-Text
Keywords: underwater 3D-scanner; fringe projection; underwater stereo camera calibration underwater 3D-scanner; fringe projection; underwater stereo camera calibration

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Bräuer-Burchardt, C.; Heinze, M.; Schmidt, I.; Kühmstedt, P.; Notni, G. Underwater 3D Surface Measurement Using Fringe Projection Based Scanning Devices. Sensors 2016, 16, 13.

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