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contenu dans Photogrammetric image analysis PIA 11, Munich, Germany, October 5-7, 2011 / Uwe Stilla (2011)

Titre :	Change detection in a topographic building database using submetric satellite images
Type de document :	Article/Communication
Auteurs :	Arnaud Le Bris , Auteur ; Nesrine Chehata , Auteur
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
Conférence :	PIA 2011, ISPRS Conference on Photogrammetric Image Analysis 05/10/2011 07/10/2011 Munich Allemagne OA ISPRS Archives
Importance :	pp 25 - 30
Format :	21 x 30 cm
Note générale :	bibliographie
Langues :	Anglais (eng)
Descripteur :	[Vedettes matières IGN] Traitement d'image optique [Termes IGN] base de données topographiques [Termes IGN] bati [Termes IGN] classification [Termes IGN] couple stéréoscopique [Termes IGN] détection de changement [Termes IGN] détection du bâti [Termes IGN] fusion de données [Termes IGN] image à résolution submétrique [Termes IGN] image Geoeye [Termes IGN] image Pléiades-HR [Termes IGN] modèle numérique de surface [Termes IGN] occupation du sol
Résumé :	(auteur) Submetric satellite imagery (Pleiades, GeoEye) offers advantages for map update purposes, e.g. an interesting ground resolution, a good reactivity and the ability to capture wide areas. Experiments on the use of such stereoscopic images for 2D change detection among building objects of GIS topographic database are presented in this paper. Two approaches have been tested. The first one extracts land cover from satellite ortho-images and additional information (correlation DSM-DTM, database) and compares building objects of this classification to those of the database. The second one creates a pseudo-DSM from height information of database building objects combined with a DTM and compares it to a correlation DSM computed from satellite images. Obtained results are quite encouraging even if the correctness rate remains too low for an operational use.
Numéro de notice :	C2011-035
Affiliation des auteurs :	MATIS+Ext (1993-2011)
Thématique :	IMAGERIE
Nature :	Communication
nature-HAL :	ComAvecCL&ActesPubliésIntl
DOI :	10.5194/isprsarchives-XXXVIII-3-W22-25-2011
Date de publication en ligne :	26/04/2013
En ligne :	https://doi.org/10.5194/isprsarchives-XXXVIII-3-W22-25-2011
Format de la ressource électronique :	URL
Permalink :	https://documentation.ensg.eu/index.php?lvl=notice_display&id=92339

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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
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
Conférence :	PIA 2011, ISPRS Conference on Photogrammetric Image Analysis 05/10/2011 07/10/2011 Munich Allemagne OA ISPRS Archives
Importance :	pp 65 - 70
Format :	21 x 30 cm
Note générale :	bibliographie
Langues :	Anglais (eng)
Descripteur :	[Vedettes matières IGN] Traitement d'image optique [Termes IGN] acuité stéréoscopique [Termes IGN] contour [Termes IGN] étalement radiométrique [Termes IGN] étalonnage radiométrique [Termes IGN] filtre de Gauss [Termes IGN] flou [Termes IGN] netteté [Termes IGN] ondelette de Haar [Termes IGN] orthophotoplan numérique [Termes 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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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
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
Conférence :	PIA 2011, ISPRS Conference on Photogrammetric Image Analysis 05/10/2011 07/10/2011 Munich Allemagne OA ISPRS Archives
Importance :	pp 71 - 76
Format :	21 x 30 cm
Note générale :	bibliographie
Langues :	Anglais (eng)
Descripteur :	[Vedettes matières IGN] Traitement d'image optique [Termes IGN] correction radiométrique [Termes IGN] distribution du coefficient de réflexion bidirectionnelle BRDF [Termes IGN] éclairement lumineux [Termes IGN] image numérique [Termes IGN] image terrestre [Termes IGN] itération [Termes IGN] lancer de rayons [Termes IGN] modèle géométrique de prise de vue [Termes IGN] problème inverse [Termes IGN] réflectance spectrale [Termes 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

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contenu dans Photogrammetric image analysis PIA 11, Munich, Germany, October 5-7, 2011 / Uwe Stilla (2011)

Titre :	Fast and accurate visibility computation in urban scenes
Type de document :	Article/Communication
Auteurs :	Bruno Vallet , Auteur ; Erwann Houzay, Auteur
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
Conférence :	PIA 2011, ISPRS Conference on Photogrammetric Image Analysis 05/10/2011 07/10/2011 Munich Allemagne OA ISPRS Archives
Importance :	pp 77 - 82
Format :	21 x 30 cm
Note générale :	bibliographie
Langues :	Anglais (eng)
Descripteur :	[Vedettes matières IGN] Applications photogrammétriques [Termes IGN] bâtiment [Termes IGN] façade [Termes IGN] géomètrie algorithmique [Termes IGN] modèle 3D de l'espace urbain [Termes IGN] processeur graphique [Termes IGN] rastérisation [Termes IGN] scène urbaine [Termes IGN] texturage [Termes IGN] visibilité entre points
Résumé :	(auteur) This paper presents a method to efficiently compute the visibility of a 3D model seen from a series of calibrated georeferenced images. This is required to make methods aimed at enriching 3D models (finer reconstruction, texture mapping) based on such images scalable. The method consists in rasterizing the scene on the GPU from the point of views of the images with a known mapping between colors and scene elements. This pixel based visibility information is then made higher level by defining a set of geometric rules to select which images should be used when focusing on a given scene element. The visibility relation is finally used to build a visibility graph allowing for efficient sequential processing of the whole scene.
Numéro de notice :	C2011-038
Affiliation des auteurs :	MATIS (1993-2011)
Thématique :	IMAGERIE
Nature :	Communication
nature-HAL :	ComAvecCL&ActesPubliésIntl
DOI :	10.5194/isprsarchives-XXXVIII-3-W22-77-2011
Date de publication en ligne :	26/04/2013
En ligne :	https://doi.org/10.5194/isprsarchives-XXXVIII-3-W22-77-2011
Format de la ressource électronique :	URL
Permalink :	https://documentation.ensg.eu/index.php?lvl=notice_display&id=92343

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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
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
Conférence :	PIA 2011, ISPRS Conference on Photogrammetric Image Analysis 05/10/2011 07/10/2011 Munich Allemagne OA ISPRS Archives
Importance :	pp 137 - 142
Format :	21 x 30 cm
Note générale :	bibliographie
Langues :	Anglais (eng)
Descripteur :	[Vedettes matières IGN] Photo-interprétation [Termes IGN] couple stéréoscopique [Termes IGN] extraction de traits caractéristiques [Termes IGN] façade [Termes IGN] habitat urbain [Termes IGN] image aérienne à axe vertical [Termes IGN] image terrestre [Termes IGN] photo-interprétation assistée par ordinateur [Termes IGN] segmentation sémantique [Termes IGN] semis de points [Termes 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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