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Close-range constrained image sequences / Juha Heikkinen 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 267 - 274 Titre : Close-range constrained image sequences Type de document : Article/Communication Auteurs : Juha Heikkinen, Auteur Année de publication : 2009 Article en page(s) : pp 267 - 274 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Acquisition d'image(s) et de donnée(s) [Termes IGN] cohérence géométrique [Termes IGN] espace objet [Termes IGN] estimation de précision [Termes IGN] méthode des moindres carrés [Termes IGN] modélisation géométrique de prise de vue [Termes IGN] orientation relative [Termes IGN] séquence d'images Résumé : (Auteur) This paper deals with a novel imaging arrangement for special modeling purpose. The method introduced here will take care of the geometrical consistence of photography. It is based on image ray bundles and is meant for conditions where imaging is accomplished inside the object space (e.g. in case of interior model reconstruction). Imaging is designed to be contrained in terms of camera position and orientation and to consist of two image sequences. The image orientation will be resolved by use of LSQ-estimation in heavily overdetermined conditions. The benefits of overdetermination are discussed and the accuracy assessment in a real experiment is published. The accuracy assessment is accomplished with help of exterior reference and stochastic error programmation. Copyright ISPRS Numéro de notice : A2009-246 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.isprsjprs.2008.10.001 En ligne : https://doi.org/10.1016/j.isprsjprs.2008.10.001 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29876 [article]

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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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An image engineering system for the inspection of transparent construction materials / Stefan Hinz 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 297 - 307 Titre : An image engineering system for the inspection of transparent construction materials Type de document : Article/Communication Auteurs : Stefan Hinz, Auteur ; M. Stephani, Auteur ; L. Schiemann, Auteur ; K. Zeller, Auteur Année de publication : 2009 Article en page(s) : pp 297 - 307 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image [Termes IGN] analyse d'image numérique [Termes IGN] matière plastique [Termes IGN] photogrammétrie métrologique [Termes IGN] reconstruction 3D [Termes IGN] résistance des matériaux Résumé : (Auteur) This article presents a modular photogrammetric recording and image analysis system for inspecting the material characteristics of transparent foils, in particular Ethylen-TetraFluorEthylen-Copolymer (ETFE) foils. The foils are put under increasing air pressure and are observed by a stereo camera system. Determining the time-variable 3D shape of transparent material imposes a number of challenges: especially the automatic point transfer between stereo images and, in temporal domain, from one image pair to the next. We developed an automatic approach that accommodates for these particular circumstances and allows reconstruction of the 3D shape for each epoch as well as determining 3D translation vectors between epochs by feature tracking. Examples including numerical results and accuracy measures prove the applicability of the system. Copyright ISPRS Numéro de notice : A2009-248 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.isprsjprs.2008.10.006 En ligne : https://doi.org/10.1016/j.isprsjprs.2008.10.006 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29878 [article]

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A hybrid measurement approach for close-range photogrammetry / Clive Simpson Fraser 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 328 - 333 Titre : A hybrid measurement approach for close-range photogrammetry Type de document : Article/Communication Auteurs : Clive Simpson Fraser, Auteur ; S. Cronk, Auteur Année de publication : 2009 Article en page(s) : pp 328 - 333 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Photogrammétrie terrestre [Termes IGN] étalonnage de capteur (imagerie) [Termes IGN] étalonnage géométrique [Termes IGN] extraction automatique [Termes IGN] extraction de traits caractéristiques [Termes IGN] photogrammétrie métrologique [Termes IGN] visualisation 3D Résumé : (Auteur) Full automation in close-range photogrammetric measurement has long been a practical reality. However, constraints apply to the process such that automated 3D measurement is generally confined to targeted points in an environment of controlled illumination. The ready availability of consumer-grade digital cameras has made photogrammetric measurement accessible and more widely employed for a host of new applications, the majority of which call for 3D measurement of other than signalized object features. Process automation is therefore typically precluded. This paper discusses a hybrid measurement approach which involves fully automatic network orientation with targets, while at the same time supporting follow-up semi-automatic and manual operations such as feature point and line extraction and surface measurement via image matching. The topics discussed include camera calibration, the metric exploitation of colour attributes, issues related to image point correspondence determination, operator assisted feature measurement and surface extraction. All are important to the practical realisation of the hybrid measurement approach. Copyright ISPRS Numéro de notice : A2009-249 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.isprsjprs.2008.09.009 En ligne : https://doi.org/10.1016/j.isprsjprs.2008.09.009 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29879 [article]

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