ROC dependent event isolation method for image processing based assessment of corroded harbour structures

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dc.contributor.author Pakrashi, Vikram
dc.contributor.author Schoefs, Franck
dc.contributor.author Memet, Jean Bernard
dc.contributor.author O'Connor, Alan J.
dc.date.accessioned 2011-04-14T12:12:18Z
dc.date.available 2011-04-14T12:12:18Z
dc.date.issued 2010
dc.identifier.citation Pakrashi, V., Schoefs, F., Memet, J. & O'Connor, A. (2010). ROC dependent event isolation method for image processing based assessment of corroded harbour structures. Structure and Infrastructure Engineering: Maintenance, Management, Life-Cycle Design and Performance, 6(3), 365-378. doi:10.1080/15732470701718072 en
dc.identifier.volume 6 en
dc.identifier.issued 3 en
dc.identifier.startpage 365 en
dc.identifier.endpage 378 en
dc.identifier.issn 1573-2479
dc.identifier.issn 1744-8980
dc.identifier.uri http://hdl.handle.net/10468/281
dc.identifier.doi 10.1080/15732470701718072
dc.description.abstract The localisation and calibration of damage in a structure are often difficult, time consuming, subjective and error prone. The importance of a simple, fast and relatively inexpensive non-destructive technique (NDT) with reliable measurements is thus greatly felt. The usefulness and the efficiency of any such technique are often affected by environmental conditions. The definition of damage and the subsequent interpretation of the possible consequences due to the damage introduce subjectivity into an NDT technique and affect its performance. It is of great importance in terms of practical application to find out the efficiency of an NDT technique in a probabilistic way for various damage definitions and environmental conditions through the use of receiver operating characteristic (ROC) curves. Such variations of performance of an NDT tool can be predicted through simulation processes, and the test conditions conducive to good detections can be isolated and ranked according to their relative efficiency. This paper considers a camera based image analysis technique to identify,quantify and classify damage in structures at various levels of scale. The general method has been applied to identify the affected areas on aluminium due to pitting corrosion. The method depends on the optical contrast of the corroded region with respect to its surroundings, performs intelligent edge detection through image processing techniques and computes each affected and closed region to predict the total area of the affected part, together with its spatial distribution on a two-dimensional plane. The effects of various environmental factors on the quality of such images are simulated from an original photograph. The objectivity and the amount of available information, quantification and localisation and the extent of pitting corrosion are observed, together with the various constructed ROC curves. The method provides the engineer, the owner of the structure and the end-user of the NDT technique with a tool to assess the performance of the structure in an as-built condition and decide on the appropriateness of a certain NDT, under a given environmental condition and a certain definition of damage. Moreover, it allows the findings of the NDT results to be introduced in the decision chain and risk analysis. en
dc.format.mimetype application/pdf en
dc.language.iso en en
dc.publisher Taylor & Francis en
dc.relation.uri http://www.informaworld.com/openurl?genre=article&issn=1573-2479&volume=6&issue=3&spage=365
dc.rights ©2008 Taylor & Francis. This is an electronic version of an article published in Pakrashi, V., Schoefs, F., Memet, J. & O'Connor, A. (2010). ROC dependent event isolation method for image processing based assessment of corroded harbour structures. Structure and Infrastructure Engineering: Maintenance, Management, Life-Cycle Design and Performance, 6(3), 365-378. doi:10.1080/15732470701718072 http://www.informaworld.com/openurl?genre=article&issn=1573-2479&volume=6&issue=3&spage=365 en
dc.subject Non-destructive technique en
dc.subject ROC en
dc.subject NDT en
dc.subject.lcsh Harbors--Maintenance and repair en
dc.subject.lcsh Structural health monitoring en
dc.subject.lcsh Image processing en
dc.subject.lcsh Receiver operating characteristic curves en
dc.title ROC dependent event isolation method for image processing based assessment of corroded harbour structures en
dc.type Article (peer-reviewed) en
dc.internal.authorurl http://publish.ucc.ie/researchprofiles/D012/vpakrashi en
dc.internal.authorcontactother Vikram Pakrashi, Civil Engineering, University College Cork, Cork, Ireland. +353-21-490-3000 Email: v.pakrashi@ucc.ie en
dc.internal.availability Full text available en
dc.date.updated 2010-10-07T14:19:28Z
dc.description.version Accepted Version en
dc.internal.rssid 52679047
dc.description.status Peer reviewed en
dc.identifier.journaltitle Structure and Infrastructure Engineering en
dc.internal.copyrightchecked RoMEO. Taylor and Francis website http://journalauthors.tandf.co.uk/preparation/copyright.asp en
dc.internal.IRISemailaddress v.pakrashi@ucc.ie en


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