Centre de documentation
scientifique

Monitoring of a laboratory-scale inland-delta formation using a structured-light system / Devrim Akca in Photogrammetric record, vol 31 n° 154 (June - August 2016)  

Public [article]  inPhotogrammetric record > vol 31 n° 154 (June - August 2016) . - pp 121 - 142 Titre : Monitoring of a laboratory-scale inland-delta formation using a structured-light system Type de document : Article/Communication Auteurs : Devrim Akca, Auteur ; Hansjörg Seybold, Auteur Année de publication : 2016 Article en page(s) : pp 121 - 142 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications photogrammétriques [Termes IGN] analyse comparative [Termes IGN] analyse diachronique [Termes IGN] Botswana [Termes IGN] données spatiotemporelles [Termes IGN] érosion hydrique [Termes IGN] géomorphologie [Termes IGN] modèle numérique de terrain [Termes IGN] pente [Termes IGN] sédimentation [Termes IGN] surveillance géologique Résumé : (auteur) A reduced complexity model, which simulates the process of fluvial inland-delta formation, has been developed in a previous study. The results have been compared and validated with a laboratory experiment. This work elaborates the laboratory investigation in which an experimental inland delta is generated and its eroding topography is measured using a structured-light 3D scanner. The least squares 3D (LS3D) co-registration and comparison method is used for alignment as well as for comparing data epochs both spatially and temporally. A spatial precision value of around ±50 μm (1/20 000) is achieved. A series of high-quality digital elevation models (DEMs) are generated and the space-time evolution of the inland delta is monitored and analysed, in terms of slope and topography dynamics, in the consecutive DEM layers. The combination of high-resolution scanning together with high-precision co-registration techniques allows investigation of the details of the space-time variability of the sedimentation-deposition patterns to be used for geomorphological analysis. Numéro de notice : A2016-465 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.1111/phor.12149 Date de publication en ligne : 17/06/2016 En ligne : https://doi.org/10.1111/phor.12149 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=81470 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
106-2016021	RAB	Revue	Centre de documentation	En réserve L003	Disponible

Quality assessment of 3D building data / Devrim Akca in Photogrammetric record, vol 25 n° 132 (December 2010 - February 2011)  

Public [article]  inPhotogrammetric record > vol 25 n° 132 (December 2010 - February 2011) . - pp 339 - 355 Titre : Quality assessment of 3D building data Type de document : Article/Communication Auteurs : Devrim Akca, Auteur ; M. Freeman, Auteur ; I. Sargent, Auteur Année de publication : 2010 Article en page(s) : pp 339 - 355 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications photogrammétriques [Termes IGN] appariement de données localisées [Termes IGN] bati [Termes IGN] contrôle qualité [Termes IGN] distance euclidienne [Termes IGN] données localisées 3D [Termes IGN] exhaustivité des données [Termes IGN] modèle numérique du bâti [Termes IGN] précision des données [Termes IGN] qualité des données [Termes IGN] reconstruction 3D du bâti Résumé : (Auteur) Three-dimensional building models are often now produced from lidar and photogrammetric data. The quality control of these models is a relevant issue both from the scientific and practical points of view. This work presents a method for the quality control of such models. The input model (3D building data) is co-registered to the verification data using a 3D surface matching method. The 3D surface matching evaluates the Euclidean distances between the verification and input data-sets. The Euclidean distances give appropriate metrics for the 3D model quality. This metric is independent of the method of data capture. The proposed method can favorably address the reference system accuracy, positional accuracy and completeness. Three practical examples of the method are provided for demonstration. Numéro de notice : A2010-530 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.1111/j.1477-9730.2010.00598.x Date de publication en ligne : 22/12/2010 En ligne : https://doi.org/10.1111/j.1477-9730.2010.00598.x Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30722 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
106-2010041	RAB	Revue	Centre de documentation	En réserve L003	Disponible

Comparative geometric and radiometric evaluation of mobile phone and still video cameras / Devrim Akca in Photogrammetric record, vol 24 n° 127 (September - November 2009)  

Public [article]  inPhotogrammetric record > vol 24 n° 127 (September - November 2009) . - pp 217 - 245 Titre : Comparative geometric and radiometric evaluation of mobile phone and still video cameras Type de document : Article/Communication Auteurs : Devrim Akca, Auteur ; Armin W. Gruen, Auteur Année de publication : 2009 Article en page(s) : pp 217 - 245 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Acquisition d'image(s) et de donnée(s) [Termes IGN] analyse comparative [Termes IGN] auto-étalonnage [Termes IGN] bruit (théorie du signal) [Termes IGN] caméra vidéo [Termes IGN] fonction de transfert de modulation [Termes IGN] précision géométrique (imagerie) [Termes IGN] précision radiométrique [Termes IGN] téléphonie mobile Résumé : (Auteur) This paper examines the potential of mobile phones to be used as front-end sensors for photogrammetric procedures and applications. For this purpose, two mobile phone cameras (Sony Ericsson K750i and Nokia N93) were calibrated over an indoor 3D testfield, using a self-calibrating bundle adjustment. Geometric accuracy tests were carried out in order to evaluate their metric performances and to compare the results with respect to two off-the-shelf digital still video cameras (Sony DSC W100 and Sony DSC F828). The geometric accuracy evaluation comprised an absolute accuracy test, JPEG test and temporal stability test. The radiometric capabilities of all cameras (except that the DSC W100 was replaced with a DSC T100 camera) were also evaluated and compared by carrying out modulation transfer function (MTF) analysis, image noise analysis and an operating range test. Substantial systematic errors were diagnosed in some systems. However, with proper calibration it is believed that these devices can be used for many photogrammetric tasks. Copyright RS&PS + Blackwell Publishing Numéro de notice : A2009-327 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.1111/j.1477-9730.2009.00541.x En ligne : https://doi.org/10.1111/j.1477-9730.2009.00541.x Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29957 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
106-09031	RAB	Revue	Centre de documentation	En réserve L003	Disponible

Matching of 3D surfaces and their intensities / Devrim Akca in ISPRS Journal of photogrammetry and remote sensing, vol 62 n° 2 (June 2007)  

Public [article]  inISPRS Journal of photogrammetry and remote sensing > vol 62 n° 2 (June 2007) . - pp 112 - 121 Titre : Matching of 3D surfaces and their intensities Type de document : Article/Communication Auteurs : Devrim Akca, Auteur Année de publication : 2007 Article en page(s) : pp 112 - 121 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image [Termes IGN] appariement géométrique [Termes IGN] attribut [Termes IGN] données laser [Termes IGN] intensité lumineuse [Termes IGN] lasergrammétrie [Termes IGN] méthode des moindres carrés [Termes IGN] modélisation 3D [Termes IGN] reconnaissance de surface [Termes IGN] semis de points [Termes IGN] superposition d'images Résumé : (Auteur) 3D surface matching would be an ill conditioned problem when the curvature of the object surface is either homogenous or isotropic, e.g. for plane or spherical types of objects. A reliable solution can only be achieved if supplementary information or functional constraints are introduced. In a previous paper, an algorithm for the least squares matching of overlapping 3D surfaces, which were digitized/sampled point by point using a laser scanner device, by the photogrammetric method or other techniques, was proposed [Gruen, A., and Akca, D., 2005. Least squares 3D surface and curve matching. ISPRS Journal of Photogrammetry and Remote Sensing 59 (3), 151–174.]. That method estimates the transformation parameters between two or more fully 3D surfaces, minimizing the Euclidean distances instead of z-differences between the surfaces by least squares. In this paper, an extension to the basic algorithm is given, which can simultaneously match surface geometry and its attribute information, e.g. intensity, colour, temperature, etc. under a combined estimation model. Three experimental results based on terrestrial laser scanner point clouds are presented. The experiments show that the basic algorithm can solve the surface matching problem provided that the object surface has at least the minimal information. If not, the laser scanner derived intensities are used as supplementary information to find a reliable solution. The method derives its mathematical strength from the least squares image matching concept and offers a high level of flexibility for many kinds of 3D surface correspondence problem. Copyright ISPRS Numéro de notice : A2007-259 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.isprsjprs.2006.06.001 En ligne : https://doi.org/10.1016/j.isprsjprs.2006.06.001 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28622 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
081-07041	SL	Revue	Centre de documentation	Revues en salle	Disponible

Least squares 3D surface and curve matching / Armin W. Gruen in ISPRS Journal of photogrammetry and remote sensing, vol 59 n° 3 (May 2005)  

Public [article]  inISPRS Journal of photogrammetry and remote sensing > vol 59 n° 3 (May 2005) . - pp 151 - 174 Titre : Least squares 3D surface and curve matching Type de document : Article/Communication Auteurs : Armin W. Gruen, Auteur ; Devrim Akca, Auteur Année de publication : 2005 Article en page(s) : pp 151 - 174 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Photogrammétrie numérique [Termes IGN] appariement de formes [Termes IGN] balayage laser [Termes IGN] courbe [Termes IGN] données localisées 3D [Termes IGN] méthode des moindres carrés [Termes IGN] modèle de Gauss-Markov [Termes IGN] modélisation 3D [Termes IGN] semis de points [Termes IGN] surface (géométrie) Résumé : (Auteur) The automatic co-registration of point clouds, representing 3D surfaces, is a relevant problem in 3D modeling. This multiple registration problem can be defined as a surface matching task. We treat it as least squares matching of overlapping surfaces. The surface may have been digitized/sampled point by point using a laser scanner device, a photogrammetric method or other surface measurement techniques. Our proposed method estimates the transformation parameters of one or more 3D search surfaces with respect to a 3D template surface, using the Generalized Gauss–Markoff model, minimizing the sum of squares of the Euclidean distances between the surfaces. This formulation gives the opportunity of matching arbitrarily oriented 3D surface patches. It fully considers 3D geometry. Besides the mathematical model and execution aspects we address the further extensions of the basic model. We also show how this method can be used for curve matching in 3D space and matching of curves to surfaces. Some practical examples based on the registration of close-range laser scanner and photogrammetric point clouds are presented for the demonstration of the method. This surface matching technique is a generalization of the least squares image matching concept and offers high flexibility for any kind of 3D surface correspondence problem, as well as statistical tools for the analysis of the quality of final matching results. Copyright ISPRS Numéro de notice : A2005-230 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.isprsjprs.2005.02.006 En ligne : https://doi.org/10.1016/j.isprsjprs.2005.02.006 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27367 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
081-05011	SL	Revue	Centre de documentation	Revues en salle	Disponible