An underwater lighting and turbidity image repository for analysing the performance of image-based non-destructive techniques

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Title: An underwater lighting and turbidity image repository for analysing the performance of image-based non-destructive techniques
Authors: O'Byrne, Michael
Schoefs, Franck
Pakrashi, Vikram
Ghosh, Bidisha
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Date: 27-May-2017
Online since: 2019-05-14T12:20:30Z
Abstract: Image processing-based methods, capable of detecting and quantifying cracks, surface defects or recovering 3D shape information are increasingly being recognised as a valuable tool for inspecting underwater structures. It is of great practical importance for inspectors to know the effectiveness of such techniques when applied in conditions. This paper considers an underwater environment characterised by poor visibility chiefly governed by the lighting and turbidity levels, along with a range of geometry and damage conditions of calibrated specimens. The paper addresses the relationship between underwater visibility and the performance of image-based methods through the development and calibration of a first open-source underwater lighting and turbidity image repository (ULTIR). ULTIR contains a large collection of images of submerged specimens that have been photographed under controlled lighting and turbidity levels featuring various forms of geometry and damage. ULTIR aims to facilitate inspectors when rationalising the use of image processing methods as part of an underwater inspection campaign and to enable researchers to efficiently evaluate the performance of image-based methods under realistic operating conditions. Stakeholders in underwater infrastructure can benefit through this first large, standardised, well-annotated, and freely available database of images and associated metadata.
Funding Details: Irish Research Council for Science, Engineering and Technology
Science Foundation Ireland
Type of material: Journal Article
Publisher: Taylor & Francis
Journal: Structure and Infrastructure Engineering - Maintenance, Management, Life-Cycle Design and Performance
Volume: 14
Issue: 1
Start page: 104
End page: 123
Copyright (published version): 2017 Informa UK Limited, trading as Taylor & Francis Group
Keywords: Non-destructive testingMarine and offshore engineeringImage analysisUnderwater visibilityCalibrationDefectsDatabasesMaintenance and inspectionStandardisation
DOI: 10.1080/15732479.2017.1330890
Language: en
Status of Item: Peer reviewed
Appears in Collections:Mechanical & Materials Engineering Research Collection

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