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Interpretation of 2D and 3D building details on facade and roofs / Philip Meixner (2011)    

Public contenu dans Photogrammetric image analysis PIA 11, Munich, Germany, October 5-7, 2011 / Uwe Stilla (2011)   Titre : Interpretation of 2D and 3D building details on facade and roofs Type de document : Article/Communication Auteurs : Philip Meixner, Auteur ; Franz W. Leberl, Auteur ; Mathieu Brédif , Auteur Congrès : PIA 2011, ISPRS Conference on Photogrammetric Image Analysis (5 - 7 octobre 2011; Munich, Allemagne) , Commanditaire Editeur : International Society for Photogrammetry and Remote Sensing ISPRS Année de publication : 2011 Collection : International Archives of Photogrammetry, Remote Sensing and Spatial Information Sciences, ISSN 1682-1750 num. 38-3/W22 Importance : pp 137 - 142 Format : 21 x 30 cm Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Photo-interprétation [Termes descripteurs IGN] couple stéréoscopique [Termes descripteurs IGN] extraction de traits caractéristiques [Termes descripteurs IGN] façade [Termes descripteurs IGN] habitat urbain [Termes descripteurs IGN] image aérienne à axe vertical [Termes descripteurs IGN] image terrestre [Termes descripteurs IGN] photo-interprétation assistée par ordinateur [Termes descripteurs IGN] segmentation sémantique [Termes descripteurs IGN] semis de points [Termes descripteurs IGN] toit Résumé : (auteur) Current Internet-inspired mapping data are in the form of street maps, orthophotos, 3D models or street-side images and serve to support mostly search and navigation. Yet the only mapping data that currently can really be searched are the street maps via their addresses and coordinates. The orthophotos, 3D models and street-side images represent predominantly “eye candy” with little added value to the Internet-user. We are interested in characterizing the elements of the urban space from imagery. In this paper, we discuss the use of street side imagery and aerial imagery to develop descriptions of urban spaces, initially of building facades and roofs. We present methods (a) to segment facades using high-overlap street side facade images, (b) to map facades and facade details from vertical aerial images, and (c) to characterize roofs by their type and details, also from aerial photography. This paper describes a method of roof segmentation with the goal of assigning each roof to a specific architectural style. Questions of the use of the attic space, or the placement of solar panels, are of interest. It is of interest that roofs have recently been mapped using LiDAR point clouds. We demonstrate that aerial images are a useful and economical alternative to LiDAR for the characterization of buildingroofs, and that they also contain very valuable information about facades. Numéro de notice : C2011-039 Affiliation des auteurs : MATIS+Ext (1993-2011) Thématique : IMAGERIE Nature : Communication nature-HAL : ComAvecCL&ActesPubliésIntl DOI : 10.5194/isprsarchives-XXXVIII-3-W22-137-2011 date de publication en ligne : 26/04/2013 En ligne : https://doi.org/10.5194/isprsarchives-XXXVIII-3-W22-137-2011 Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=92346

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Multiscale Haar transform for blur estimation from a set of images / Lâmân Lelégard (2011)    

Public contenu dans Photogrammetric image analysis PIA 11, Munich, Germany, October 5-7, 2011 / Uwe Stilla (2011)   Titre : Multiscale Haar transform for blur estimation from a set of images Type de document : Article/Communication Auteurs : Lâmân Lelégard , Auteur ; Bruno Vallet , Auteur ; Mathieu Brédif , Auteur Congrès : PIA 2011, ISPRS Conference on Photogrammetric Image Analysis (5 - 7 octobre 2011; Munich, Allemagne) , Commanditaire Editeur : International Society for Photogrammetry and Remote Sensing ISPRS Année de publication : 2011 Collection : International Archives of Photogrammetry, Remote Sensing and Spatial Information Sciences, ISSN 1682-1750 num. 38-3/W22 Importance : pp 65 - 70 Format : 21 x 30 cm Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image optique [Termes descripteurs IGN] acuité stéréoscopique [Termes descripteurs IGN] contour [Termes descripteurs IGN] étalement radiométrique [Termes descripteurs IGN] étalonnage radiométrique [Termes descripteurs IGN] filtre de Gauss [Termes descripteurs IGN] flou [Termes descripteurs IGN] netteté [Termes descripteurs IGN] ondelette de Haar [Termes descripteurs IGN] orthophotoplan numérique [Termes descripteurs IGN] tâche image d'un point Résumé : (auteur) This paper proposes a method to estimate the local sharpness of an optical system through the wavelet-based analysis of a large set of images it acquired. Assuming a space-invariant distribution of image features, such as in the aerial photography context, the proposed approach produces a sharpness map of the imaging device over 16x16 pixels blocks that enables, for instance, the detection of optical defects and the qualification of the mosaicking of multiple sensor images into a larger composite image. The proposed analysis is based on accumulating of the edge maps corresponding to the first levels of the Haar Transform of each image of the dataset, following the intuition that statistically, each pixel will see the same image structures. We propose a calibration method to transform these accumulated edge maps into a sharpness map by approximating the local PSF (Point Spread Function) with a Gaussian blur. Numéro de notice : C2011-036 Affiliation des auteurs : MATIS (1993-2011) Thématique : IMAGERIE Nature : Communication nature-HAL : ComAvecCL&ActesPubliésIntl DOI : 10.5194/isprsarchives-XXXVIII-3-W22-65-2011 date de publication en ligne : 26/04/2013 En ligne : https://doi.org/10.5194/isprsarchives-XXXVIII-3-W22-65-2011 Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=92340

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en open access Multiscale Haar transform... - pdf éditeur Adobe Acrobat PDF

Reflectance estimation from urban terrestrial images: validation of a symbolic ray-tracing method on synthetic data / Fabien Coubard (2011)    

Public contenu dans Photogrammetric image analysis PIA 11, Munich, Germany, October 5-7, 2011 / Uwe Stilla (2011)   Titre : Reflectance estimation from urban terrestrial images: validation of a symbolic ray-tracing method on synthetic data Type de document : Article/Communication Auteurs : Fabien Coubard, Auteur ; Mathieu Brédif , Auteur ; Nicolas Paparoditis , Auteur ; Xavier Briottet , Auteur Congrès : PIA 2011, ISPRS Conference on Photogrammetric Image Analysis (5 - 7 octobre 2011; Munich, Allemagne) , Commanditaire Editeur : International Society for Photogrammetry and Remote Sensing ISPRS Année de publication : 2011 Collection : International Archives of Photogrammetry, Remote Sensing and Spatial Information Sciences, ISSN 1682-1750 num. 38-3/W22 Importance : pp 71 - 76 Format : 21 x 30 cm Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image optique [Termes descripteurs IGN] correction radiométrique [Termes descripteurs IGN] distribution du coefficient de réflexion bidirectionnelle BRDF [Termes descripteurs IGN] éclairement lumineux [Termes descripteurs IGN] image numérique [Termes descripteurs IGN] image terrestre [Termes descripteurs IGN] itération [Termes descripteurs IGN] lancer de rayons [Termes descripteurs IGN] modèle géométrique de prise de vue [Termes descripteurs IGN] problème inverse [Termes descripteurs IGN] réflectance spectrale [Termes descripteurs IGN] scène urbaine Résumé : (auteur) Terrestrial geolocalized images are nowadays widely used on the Internet, mainly in urban areas, through immersion services such as Google Street View. On the long run, we seek to enhance the visualization of these images. For that purpose, radiometric corrections must be performed to free them from illumination conditions at the time of acquisition. Given the simultaneously acquired 3D geometric model of the scene with LIDAR or vision techniques, we face an inverse problem where the illumination and the geometry of the scene are known and the reflectance of the scene is to be estimated. Our main contribution is the introduction of a symbolic ray-tracing rendering to generate parametric images, for quick evaluation and comparison with the acquired images. The proposed approach is then based on an iterative estimation of the reflectance parameters of the materials, using a single rendering pre-processing. We validate the method on synthetic data with linear BRDF models and discuss the limitations of the proposed approach with more general non-linear BRDF models. Numéro de notice : C2011-037 Affiliation des auteurs : MATIS+Ext (1993-2011) Thématique : IMAGERIE Nature : Communication nature-HAL : ComAvecCL&ActesPubliésIntl DOI : 10.5194/isprsarchives-XXXVIII-3-W22-71-2011 date de publication en ligne : 26/04/2013 En ligne : https://doi.org/10.5194/isprsarchives-XXXVIII-3-W22-71-2011 Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=92341

Documents numériques

en open access Reflectance estimation... - pdf éditeur Adobe Acrobat PDF

An efficient stochastic approach for building footprint extraction from digital elevation models / Olivier Tournaire in ISPRS Journal of photogrammetry and remote sensing, vol 65 n° 4 (July - August 2010)  

Public [article]  inISPRS Journal of photogrammetry and remote sensing > vol 65 n° 4 (July - August 2010) . - 11 p. ; pp 317 - 327 Titre : An efficient stochastic approach for building footprint extraction from digital elevation models Type de document : Article/Communication Auteurs : Olivier Tournaire, Auteur ; Didier Boldo , Auteur ; Mélanie Durupt, Auteur ; Mathieu Brédif , Auteur Année de publication : 2010 Article en page(s) : 11 p. ; pp 317 - 327 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image [Termes descripteurs IGN] chaîne de Markov [Termes descripteurs IGN] détection du bâti [Termes descripteurs IGN] efficacité [Termes descripteurs IGN] empreinte [Termes descripteurs IGN] méthode de Monte-Carlo [Termes descripteurs IGN] milieu urbain [Termes descripteurs IGN] modèle numérique de surface Résumé : (Auteur) In the past two decades, building detection and reconstruction from remotely sensed data has been an active research topic in the photogrammetric and remote sensing communities. Recently, effective high level approaches have been developed, i.e., the ones involving the minimization of an energetic formulation. Yet, their efficiency has to be balanced by the amount of processing power required to obtain good results. In this paper, we introduce an original energetic model for building footprint extraction from high resolution digital elevation models (?1 m) in urban areas. Our goal is to formulate the energy in an efficient way, easy to parametrize and fast to compute, in order to get an effective process still providing good results. Our work is based on stochastic geometry, and in particular on marked point processes of rectangles. We therefore try to obtain a reliable object configuration described by a collection of rectangular building footprints. To do so, an energy function made up of two terms is defined: the first term measures the adequacy of the objects with respect to the data and the second one has the ability to favour or penalize some footprint configurations based on prior knowledge (alignment, overlapping,...). To minimize the global energy, we use a Reversible Jump Monte Carlo Markov Chain (RJMCMC) sampler coupled with a simulated annealing algorithm, leading to an optimal configuration of objects. Various results from different areas and resolutions are presented and evaluated. Our work is also compared with an already existing methodology based on the same mathematical framework that uses a much more complex energy function. We show how we obtain similarly good results with a high computational efficiency (between 50 and 100 times faster) using a simplified energy that requires a single data-independent parameter, compared to more than 20 inter-related and hard-to-tune parameters. Numéro de notice : A2010-294 Affiliation des auteurs : IGN (1940-2011) Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.isprsjprs.2010.02.002 date de publication en ligne : 12/03/2010 En ligne : https://doi.org/10.1016/j.isprsjprs.2010.02.002 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30488 [article]

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Insertion of 3-D-primitives in mesh-based representations: Towards compact models preserving the details / Florent Lafarge in IEEE Transactions on image processing, vol 19 n° 7 (July 2010)  

Public [article]  inIEEE Transactions on image processing > vol 19 n° 7 (July 2010) . - pp 1683 - 1694 Titre : Insertion of 3-D-primitives in mesh-based representations: Towards compact models preserving the details Type de document : Article/Communication Auteurs : Florent Lafarge, Auteur ; Renaud Keriven, Auteur ; Mathieu Brédif , Auteur Année de publication : 2010 Article en page(s) : pp 1683 - 1694 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications photogrammétriques [Termes descripteurs IGN] approche hiérarchique [Termes descripteurs IGN] carte de profondeur [Termes descripteurs IGN] information sémantique [Termes descripteurs IGN] maille triangulaire [Termes descripteurs IGN] modèle 3D de l'espace urbain [Termes descripteurs IGN] primitive géométrique [Termes descripteurs IGN] scène urbaine Résumé : (auteur) We propose an original hybrid modeling process of urban scenes that represents 3-D models as a combination of mesh-based surfaces and geometric 3-D-primitives. Meshes describe details such as ornaments and statues, whereas 3-D-primitives code for regular shapes such as walls and columns. Starting from an 3-D-surface obtained by multiview stereo techniques, these primitives are inserted into the surface after being detected. This strategy allows the introduction of semantic knowledge, the simplification of the modeling, and even correction of errors generated by the acquisition process. We design a hierarchical approach exploring different scales of an observed scene. Each level consists first in segmenting the surface using a multilabel energy model optimized by -expansion and then in fitting 3-D-primitives such as planes, cylinders or tori on the obtained partition where relevant. Experiments on real meshes, depth maps and synthetic surfaces show good potential for the proposed approach. Numéro de notice : A2010-662 Affiliation des auteurs : MATIS+Ext (1993-2011) Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1109/TIP.2010.2045695 date de publication en ligne : 15/03/2010 En ligne : https://doi.org/10.1109/TIP.2010.2045695 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=91762 [article]

Amélioration d'une base de données d'empreintes de bâtiments pour la reconstruction 3D : une approche par découpe et fusion / Bruno Vallet (19/01/2010)  

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Détection d'empreintes de bâtiments dans un modèle numérique d'élévation / Olivier Tournaire (19/01/2010)    

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Modélisation 3D de bâtiments / Mathieu Brédif (2010) 

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Motion blur detection in aerial images shot with channel-dependent exposure time / Lâmân Lelégard (2010)  

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Combining meshes and geometric primitives for accurate and semantic modeling / Florent Lafarge (07/09/2009) 

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An efficient approach to building superstructure reconstruction using digital elevation maps / Fadi Dornaika (01/07/2008)

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