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Proceedings Paper

Optical crack following on tunnel surfaces
Author(s): Gerhard Paar; Maria d. P. Caballo-Perucha; Heiner Kontrus; Oliver Sidla
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Paper Abstract

One of the most important monitoring tasks of tunnel inspection is the observation of cracks. This paper describes an approach for crack following using mid-resolution (2-5mm per pixel) images of the tunnel surface. A mosaic on the basis of the tunnel design surface is built from images taken with a mobile platform. On this image representing the unwrapped tunnel surface texture the starting points of each crack are found semiautomatically using a modified Hough transform. Crack following takes place on the basis of local line fitting and exhaustive search in both directions of the crack, taking into account several restrictions, rules and optimization criteria to find the correct crack trajectory. A practical implementation polygonizes the extracted cracks and feeds them into a tunnel inspection data base. The method is applicable to various types of background texture as expected in the tunnel environment.

Paper Details

Date Published: 20 October 2006
PDF: 8 pages
Proc. SPIE 6382, Two- and Three-Dimensional Methods for Inspection and Metrology IV, 638207 (20 October 2006); doi: 10.1117/12.685987
Show Author Affiliations
Gerhard Paar, Joanneum Research (Austria)
Maria d. P. Caballo-Perucha, Joanneum Research (Austria)
Heiner Kontrus, Dibit Messtechnik GmbH. (Austria)
Oliver Sidla, Joanneum Research (Austria)

Published in SPIE Proceedings Vol. 6382:
Two- and Three-Dimensional Methods for Inspection and Metrology IV
Peisen S. Huang, Editor(s)

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