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Proceedings Paper

Wavelet processing for image denoising and edge detection in automatic corrosion detection algorithms used in shipboard ballast tank video inspection systems
Author(s): Bruce N. Nelson; Paul Slebodnick; Edward J. Lemieux; William Singleton; Matt Krupa; Keith Lucas; E. Dail Thomas II; Andrew Seelinger
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Paper Abstract

Over the past several years, the Naval Research Laboratory has been developing video inspection systems for assessing the coatings condition in shipboard ballast tanks. Two prototype systems have been configured and are presently being utilized to perform video inspections of dry and filled ballast tanks. These systems are described in this paper. The large size and low level lighting associated with this application results in 'noisy' imagery. A wavelet based de-noising method has been developed that removes the noise in the video imagery while maintaining other edges important to corrosion detection. Specific examples that demonstrate the efficacy of the de-noising methods are provided. Wavelet edge detection methods are then applied to the de-noised imagery to identify both regions of potential rust and the spatial distribution of rust. Additional methodologies are then utilized for final corrosion classification. The paper will provide examples of imagery collected in shipboard ballast tanks and examples of applying the automatic corrosion detection algorithms. These examples demonstrate the algorithms ability to work with 'noisy' imagery and to ignore objects in the imagery such as ladders and pipes. They also demonstrate the robustness of the developed automatic corrosion detection algorithms.

Paper Details

Date Published: 26 March 2001
PDF: 12 pages
Proc. SPIE 4391, Wavelet Applications VIII, (26 March 2001); doi: 10.1117/12.421194
Show Author Affiliations
Bruce N. Nelson, Geo-Centers, Inc. (United States)
Paul Slebodnick, Naval Research Lab. (United States)
Edward J. Lemieux, Naval Research Lab. (United States)
William Singleton, Geo-Centers, Inc. (United States)
Matt Krupa, Naval Research Lab. (United States)
Keith Lucas, Naval Research Lab. (United States)
E. Dail Thomas II, Naval Sea Systems Command (United States)
Andrew Seelinger, Naval Sea Systems Command (United States)

Published in SPIE Proceedings Vol. 4391:
Wavelet Applications VIII
Harold H. Szu; David L. Donoho; Adolf W. Lohmann; William J. Campbell; James R. Buss, Editor(s)

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