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Crack measurement : development, testing and applications of an automatic image-based algorithm / L. Barazetti in ISPRS Journal of photogrammetry and remote sensing, vol 64 n° 3 (May - June 2009)  

Public [article]  inISPRS Journal of photogrammetry and remote sensing > vol 64 n° 3 (May - June 2009) . - pp 285 - 296 Titre : Crack measurement : development, testing and applications of an automatic image-based algorithm Type de document : Article/Communication Auteurs : L. Barazetti, Auteur ; Marco Scaioni, Auteur Année de publication : 2009 Article en page(s) : pp 285 - 296 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications photogrammétriques [Termes IGN] analyse d'image numérique [Termes IGN] auscultation d'ouvrage [Termes IGN] déformation d'édifice [Termes IGN] détection de cible [Termes IGN] photogrammétrie architecturale [Termes IGN] précision des mesures [Termes IGN] profil en long [Termes IGN] repère de référence [Termes IGN] séquence d'images [Termes IGN] surveillance d'ouvrage Résumé : (Auteur) The paper presents an Image-based Method for Crack Analysis (IMAC) which is capable of processing a sequence of digital imagery to perform a twofold task:(i) the extraction of crack borders and the evaluation of its width across the longitudinal profile; (ii) the measurement of crack deformations (width, sliding and rotation). Here both problems are solved in 2D, but an extension to 3D is also addressed. The equipment needed to apply the method is made up of a digital camera (or a still video-camera in case a high frequency in data acquisition is necessary), an orientation frame which establishes the object reference system, a pair of signalized supports to be placed in a permanent way on both sides of the crack to compute deformations ; however, permanent targets are mandatory only for case (ii). The measurement process is carried out in a fully automatic way, a fact also that makes this technique highly operational for unskilled people in engineering surveying or photogrammetry. The accuracy of the proposed method, evaluated in experimental tests adopting different consumer digital cameras, is about + 5-20 um, like the accuracy of most deformometers, but with the advantage of automation and of augmented achievable information ; moreover, the image sequence can be archived and off-line measurements could be performed at any time. Numéro de notice : A2009-247 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.isprsjprs.2009.02.004 En ligne : https://doi.org/10.1016/j.isprsjprs.2009.02.004 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29877 [article]

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