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Image-based 3D surface reconstruction by combination of photometric, geometric, and real-aperture methods / P. D' Angelo in ISPRS Journal of photogrammetry and remote sensing, vol 63 n° 3 (May - June 2008)

Public [article]  inISPRS Journal of photogrammetry and remote sensing > vol 63 n° 3 (May - June 2008) . - pp 297 - 321 Titre : Image-based 3D surface reconstruction by combination of photometric, geometric, and real-aperture methods Type de document : Article/Communication Auteurs : P. D' Angelo, Auteur ; C. Wöhler, Auteur Année de publication : 2008 Article en page(s) : pp 297 - 321 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Photogrammétrie numérique [Termes descripteurs IGN] données de terrain [Termes descripteurs IGN] gradient de pente [Termes descripteurs IGN] pente [Termes descripteurs IGN] photométrie [Termes descripteurs IGN] polarisation [Termes descripteurs IGN] profondeur [Termes descripteurs IGN] programmation non linéaire [Termes descripteurs IGN] reconstruction 3D [Termes descripteurs IGN] réflectance Résumé : (Auteur) An image-based 3D surface reconstruction method based on simultaneous evaluation of intensity and polarisation features (shape from photopolarimetric reflectance) and its combination with absolute depth data is introduced in this article. The proposed technique is based on the analysis of single or multiple intensity and polarisation images. To compute the surface gradients, we present a global optimisation method based on a variational framework and a local optimisation method based on solving a set of non-linear equations individually for each image pixel. These approaches are suitable for strongly non-Lambertian surfaces and those of diffuse reflectance behaviour and can also be adapted to surfaces of non-uniform albedo. We describe how independently measured absolute depth data is integrated into the shape from photopolarimetric reflectance framework in order to increase the accuracy of the 3D reconstruction result. In this context we concentrate on dense but noisy depth data obtained by depth from defocus and on sparse but accurate depth data obtained by stereo or structure from motion analysis. We show that depth from defocus information should preferentially be used for initialising the optimisation schemes for the surface gradients. For integration of sparse depth information, we suggest an optimisation scheme that simultaneously adapts the surface gradients to the measured intensity and polarisation data and to the surface slopes implied by depth differences between pairs of depth points. In principle, arbitrary sources of depth information are possible in the presented framework. Experiments on synthetic and on real-world data reveal that while depth from defocus is especially helpful for providing an initial estimate of the surface gradients and the albedo in the absence of a-priori knowledge, integration of stereo or structure from motion information significantly increases the 3D reconstruction accuracy. In our real-world experiments, we regard the scenarios of 3D reconstruction of raw forged iron surfaces in the domain of industrial quality inspection and the generation of a digital elevation model of a section of the lunar surface in the context of space-based planetary exploration. Copyright ISPRS Numéro de notice : A2008-213 Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29208 [article]

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CGIV 2008 / MCS'08, 4th European conference on colour in graphics, imaging, and vision, 10th international syposium on Multispectral colour scienceJune 9 - 13 2008, Barcelona, Spain / Jaume Pujol (2008)

Public Titre : CGIV 2008 / MCS'08, 4th European conference on colour in graphics, imaging, and vision, 10th international syposium on Multispectral colour scienceJune 9 - 13 2008, Barcelona, Spain : Final program and proceedings Type de document : Actes de congrès Auteurs : Jaume Pujol, Editeur scientifique Congrès : Congrès: CGIV 2008 & MCS 2008, 4th European conference on colour in graphics, imaging, and vision 10th international symposium on Multispectral colour science (9 - 13 juin 2008; Barcelone, Espagne), Auteur Editeur : Universitat Politècnica de Catalunya Année de publication : 2008 Format : 1 cédérom Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image [Termes descripteurs IGN] chromatopsie [Termes descripteurs IGN] colorimétrie [Termes descripteurs IGN] constance des couleurs [Termes descripteurs IGN] couleur imprimée [Termes descripteurs IGN] distribution du coefficient de réflexion bidirectionnelle BRDF [Termes descripteurs IGN] image multibande [Termes descripteurs IGN] image spectrale [Termes descripteurs IGN] intensité lumineuse [Termes descripteurs IGN] palette de couleurs [Termes descripteurs IGN] réflectance spectrale [Termes descripteurs IGN] transformation en ondelettes Index. décimale : MULTIM Cédéroms et DVD Numéro de notice : 24672 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Actes Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=92413

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Correction of laser scanning intensity data: data and model-driven approaches / Bernhard Höfle in ISPRS Journal of photogrammetry and remote sensing, vol 62 n° 6 (November-December 2007)

Public [article]  inISPRS Journal of photogrammetry and remote sensing > vol 62 n° 6 (November-December 2007) . - pp 415 - 433 Titre : Correction of laser scanning intensity data: data and model-driven approaches Type de document : Article/Communication Auteurs : Bernhard Höfle, Auteur ; Norbert Pfeifer, Auteur Année de publication : 2007 Article en page(s) : pp 415 - 433 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Acquisition d'image(s) et de donnée(s) [Termes descripteurs IGN] correction du signal [Termes descripteurs IGN] intensité lumineuse [Termes descripteurs IGN] réflectance de surface [Termes descripteurs IGN] signal laser [Termes descripteurs IGN] télémètre laser à balayage [Termes descripteurs IGN] traitement du signal Résumé : (Auteur) Most airborne and terrestrial laser scanning systems additionally record the received signal intensity for each measurement. Multiple studies show the potential of this intensity value for a great variety of applications (e.g. strip adjustment, forestry, glaciology), but also state problems if using the original recorded values. Three main factors, a) spherical loss, b) topographic and c) atmospheric effects, influence the backscatter of the emitted laser power, which leads to a noticeably heterogeneous representation of the received power. This paper describes two different methods for correcting the laser scanning intensity data for these known influences resulting in a value proportional to the reflectance of the scanned surface. The first approach – data-driven correction – uses predefined homogeneous areas to empirically estimate the best parameters (least-squares adjustment) for a given global correction function accounting for all range-dependent influences. The second approach – model-driven correction – corrects each intensity independently based on the physical principle of radar systems. The evaluation of both methods, based on homogeneous reflecting areas acquired at different heights in different missions, indicates a clear reduction of intensity variation, to 1/3.5 of the original variation, and offsets between flight strips to 1/10. The presented correction methods establish a great potential for laser scanning intensity to be used for surface classification and multi-temporal analyses. Copyright ISPRS Numéro de notice : A2007-528 Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28891 [article]

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Dasymetric modelling of small-area population distribution using land cover and light emissions data / D.J. Briggs in Remote sensing of environment, vol 108 n° 4 (29 June 2007)

Public [article]  inRemote sensing of environment > vol 108 n° 4 (29 June 2007) . - pp 451 - 466 Titre : Dasymetric modelling of small-area population distribution using land cover and light emissions data Type de document : Article/Communication Auteurs : D.J. Briggs, Auteur ; J. Gulliver, Auteur ; et al., Auteur Année de publication : 2007 Article en page(s) : pp 451 - 466 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image [Termes descripteurs IGN] Corine Land Cover [Termes descripteurs IGN] densité de population [Termes descripteurs IGN] distribution spatiale [Termes descripteurs IGN] données statistiques [Termes descripteurs IGN] figuration de la densité [Termes descripteurs IGN] flux lumineux [Termes descripteurs IGN] image DMSP-OLS [Termes descripteurs IGN] image satellite [Termes descripteurs IGN] intensité lumineuse [Termes descripteurs IGN] interpolation inversement proportionnelle à la distance [Termes descripteurs IGN] krigeage [Termes descripteurs IGN] régression Résumé : (Auteur) Despite the improvements made in census procedures over recent decades, the availability of detailed population data is limited. For many applications, including environmental and health analyses, methods are therefore needed to model population distribution at the small-area level. With the development of GIS and remote sensing techniques, the ability to develop such models has greatly improved. This paper describes a GIS-based approach using remotely sensed land cover and nighttime light emissions data to model population distribution at the land parcel level across the European Union. Light emission data from the DMSP satellites were first resampled and modelled using kriging and inverse distance weighting methods to provide a 200-m resolution light emissions map. This was then matched to CORINE land cover classes across the EU. Regression methods were used to derive models of relationships between census population counts (at NUTS 5 level) and land cover area and light emissions. Models were developed at both national and EU scale, using a range of different modelling strategies. Model performance, as indicated by the regression statistics, was seen to be good, with R2 typically in the order of 0.8–0.9 and SEE ca. 4000 people. In southern countries, especially, incorporation of light emissions data was found to improve model performance considerably compared to models based only on land cover data. More detailed post hoc validation in Great Britain, using independent data on population at census tract (enumeration district and output area) and postcode level, for 1991 and 2001, showed that models gave good predictions of population at the 1 km level (R2 > 0.9), but were less reliable at resolutions below ca. 500 m. Impending enhancements in the available land cover and light emissions data are expected to improve the capability of this modelling approach in the future. Numéro de notice : A2007-300 Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28663 [article]

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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 descripteurs IGN] appariement géométrique [Termes descripteurs IGN] attribut [Termes descripteurs IGN] données laser [Termes descripteurs IGN] intensité lumineuse [Termes descripteurs IGN] lasergrammétrie [Termes descripteurs IGN] méthode des moindres carrés [Termes descripteurs IGN] modélisation 3D [Termes descripteurs IGN] reconnaissance de surface [Termes descripteurs IGN] semis de points [Termes descripteurs 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 Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28622 [article]

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Monitoring spatio-temporal dynamics of photosynthesis with a portable hyperspectral imaging system / U. Rascher in Photogrammetric Engineering & Remote Sensing, PERS, vol 73 n° 1 (January 2007)

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Cours de photographie numérique / R. Bouillot (2006)

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Efficiently acquiring reflectance fields using patterned illumination / Gaurav Garg (2006) 

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Modèle d'amélioration automatique des contrastes de couleur en cartographie / Elisabeth Chesneau (2006)

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Rapport du directeur sur l'activité et la gestion du Bureau International des Poids et Mesures (BIPM), 1er juillet 2005 - 30 juin 2006 / Bureau international des poids et mesures (2006)

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Aufnahmen flugzeuggetragener Laserscanner als Grundlage zur Erfassung von Strassen und Wegen in bewaldeten Gebieten [Des données par laserscanner aéroporté comme base pour l'extraction de voies et de chemins dans des régions boisées] / M. Attwenger (01/09/2005)

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Using angular and spectral shape similarity constraints to improve MISR aerosol and surface retrievals over land / D. Diner in Remote sensing of environment, vol 94 n° 2 (30/01/2005)

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Maritime aerosol optical thickness measured by handheld sun photometers / K.D. Knobelspiesse in Remote sensing of environment, vol 93 n° 1 (30/10/2004)

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Vicarious radiometric calibration of satellite ocean colour sensors / D. Antoine (01/09/2004)

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An autonomous above-water system for the validation of ocean color radiance data / G. Ziborni in IEEE Transactions on geoscience and remote sensing, vol 42 n° 2 (February 2004)

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