STRUCTURED-LIGHT BASED 3D LASER SCANNING OF SEMI-SUBMERGED STRUCTURES

Content Provider	Scilit
Author	van der Lucht, J. Bleier, M. Leutert, F. Schilling, K. Nüchter, A.
Copyright Year	2018
Description	In this work we look at 3D acquisition of semi-submerged structures with a triangulation based underwater laser scanning system. The motivation is that we want to simultaneously capture data above and below water to create a consistent model without any gaps. The employed structured light scanner consist of a machine vision camera and a green line laser. In order to reconstruct precise surface models of the object it is necessary to model and correct for the refraction of the laser line and camera rays at the water-air boundary. We derive a geometric model for the refraction at the air-water interface and propose a method for correcting the scans. Furthermore, we show how the water surface is directly estimated from sensor data. The approach is verified using scans captured with an industrial manipulator to achieve reproducible scanner trajectories with different incident angles. We show that the proposed method is effective for refractive correction and that it can be applied directly to the raw sensor data without requiring any external markers or targets.
Ending Page	294
Page Count	8
Starting Page	287
e-ISSN	21949050
DOI	10.5194/isprs-annals-iv-2-287-2018
Journal	ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences
Volume Number	IV-2
Language	English
Publisher	Copernicus GmbH
Publisher Date	2018-05-28
Access Restriction	Open
Subject Keyword	Cybernetical Science Underwater Laser Scanning Refractive Correction Structured Light 3d Reconstruction
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences Environmental Science Instrumentation