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Using colour, texture, and hierarchical segmentation for high-resolution remote sensing / Roger Trias-Sanz in ISPRS Journal of photogrammetry and remote sensing, vol 63 n° 2 (March - April 2008)  

Public [article]  inISPRS Journal of photogrammetry and remote sensing > vol 63 n° 2 (March - April 2008) . - pp 156 - 168 Titre : Using colour, texture, and hierarchical segmentation for high-resolution remote sensing Type de document : Article/Communication Auteurs : Roger Trias-Sanz , Auteur ; Georges Stamon, Auteur ; Jean Louchet, Auteur Année de publication : 2008 Article en page(s) : pp 156 - 168 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image optique [Termes IGN] approche hiérarchique [Termes IGN] espace colorimétrique [Termes IGN] image aérienne [Termes IGN] image multibande [Termes IGN] objet cartographique [Termes IGN] segmentation d'image [Termes IGN] texture d'image [Termes IGN] zone rurale Résumé : (Auteur) Image segmentation can be performed on raw radiometric data, but also on transformed colour spaces, or, for high-resolution images, on textural features. We review several existing colour space transformations and textural features, and investigate which combination of inputs gives best results for the task of segmenting high-resolution multispectral aerial images of rural areas into its constituent cartographic objects such as fields, orchards, forests, or lakes, with a hierarchical segmentation algorithm. A method to quantitatively evaluate the quality of a hierarchical image segmentation is presented, and the behaviour of the segmentation algorithm for various parameter sets is also explored. Copyright ISPRS Numéro de notice : A2008-113 Affiliation des auteurs : IGN+Ext (1940-2011) Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.isprsjprs.2007.08.005 Date de publication en ligne : 24/10/2007 En ligne : https://doi.org/10.1016/j.isprsjprs.2007.08.005 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29108 [article]

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A method to test differences between additional parameter sets with a case study in terrestrial laser scanner self-calibration stability analysis / Derek D. Lichti in ISPRS Journal of photogrammetry and remote sensing, vol 63 n° 2 (March - April 2008)  

Public [article]  inISPRS Journal of photogrammetry and remote sensing > vol 63 n° 2 (March - April 2008) . - pp 169 - 180 Titre : A method to test differences between additional parameter sets with a case study in terrestrial laser scanner self-calibration stability analysis Type de document : Article/Communication Auteurs : Derek D. Lichti, Auteur Année de publication : 2008 Article en page(s) : pp 169 - 180 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Acquisition d'image(s) et de donnée(s) [Termes IGN] auto-étalonnage [Termes IGN] compensation par faisceaux [Termes IGN] erreur systématique [Termes IGN] orientation du capteur [Termes IGN] point d'appui [Termes IGN] reconstruction d'objet [Termes IGN] stabilité [Termes IGN] télémètre laser à balayage [Termes IGN] télémètre laser terrestre [Termes IGN] test statistique Résumé : (Auteur) This paper presents a new method for quantitatively assessing the impact and therefore the significance of differences between sets of additional parameters used to model systematic sensor errors. Focusing on bundle reconstruction at the sensor, simulation-based techniques have recently been proposed as superior methods to standard parameter-space hypothesis testing. This paper experimentally demonstrates the shortcoming of this approach and proposes an improved method that tests the effect of additional parameter differences on object reconstruction, which is generally of primary interest in photogrammetry. Additionally, the arbitrariness in selecting only one or two object space configurations is overcome with the new method by simulating a large number of randomly-generated but realistic control point networks for sensor orientation and a dense grid of points for object reconstruction. The experimental subject of the paper is a Faro 880 terrestrial laser scanner for which 10 sets of calibration parameters have been captured over a 13-month period. While standard parameter-space hypothesis testing indicates the instrument is not stable over this time, the new procedure shows that this is not true in all instances. Copyright ISPRS Numéro de notice : A2008-114 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.isprsjprs.2007.08.001 En ligne : https://doi.org/10.1016/j.isprsjprs.2007.08.001 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29109 [article]

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Object extraction in photogrammetric computer vision / Helmut Mayer in ISPRS Journal of photogrammetry and remote sensing, vol 63 n° 2 (March - April 2008)  

Public [article]  inISPRS Journal of photogrammetry and remote sensing > vol 63 n° 2 (March - April 2008) . - pp 213 - 222 Titre : Object extraction in photogrammetric computer vision Type de document : Article/Communication Auteurs : Helmut Mayer, Auteur Année de publication : 2008 Article en page(s) : pp 213 - 222 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Photogrammétrie numérique [Termes IGN] détection d'objet [Termes IGN] état de l'art [Termes IGN] extraction automatique [Termes IGN] station de travail de photogrammétrie numérique [Termes IGN] test statistique Résumé : (Auteur) This paper discusses state and promising directions of automated object extraction in photogrammetric computer vision considering also practical aspects arising for digital photogrammetric workstations (DPW). A review of the state of the art shows that there are only few practically successful systems on the market. Therefore, important issues for a practical success of automated object extraction are identified. A sound and most important powerful theoretical background is the basis. Here, we particularly point to statistical modeling. Testing makes clear which of the approaches are suited best and how useful they are for praxis. A key for commercial success of a practical system is efficient user interaction. As the means for data acquisition are changing, new promising application areas such as extremely detailed three-dimensional (3D) urban models for virtual television or mission rehearsal evolve. Copyright ISPRS Numéro de notice : A2008-115 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.isprsjprs.2007.08.008 En ligne : https://doi.org/10.1016/j.isprsjprs.2007.08.008 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29110 [article]

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A comparison of illumination geometry-based methods for topographic correction of QuickBird images of an undulant area / J. Wu in ISPRS Journal of photogrammetry and remote sensing, vol 63 n° 2 (March - April 2008)  

Public [article]  inISPRS Journal of photogrammetry and remote sensing > vol 63 n° 2 (March - April 2008) . - pp 223 - 236 Titre : A comparison of illumination geometry-based methods for topographic correction of QuickBird images of an undulant area Type de document : Article/Communication Auteurs : J. Wu, Auteur ; M. Bauer, Auteur ; D. Wang, Auteur ; et al., Auteur Année de publication : 2008 Article en page(s) : pp 223 - 236 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image optique [Termes IGN] analyse comparative [Termes IGN] correction d'image [Termes IGN] détail topographique [Termes IGN] éclairement lumineux [Termes IGN] exitance spectrale [Termes IGN] image Quickbird [Termes IGN] modèle numérique de surface Résumé : (Auteur) The high spatial resolution of QuickBird satellite images makes it possible to show spatial variability at fine details. However, the effect of topography-induced illumination variations become more evident, even in moderately sloped areas. Based on a high resolution (1 m) digital elevation model generated with high-frequency real-time kinematic global position system measurements, this study assessed topographic effects on QuickBird images of an undulant area (with a maximum slope of 7.4°) under different illumination and ground conditions. For land surfaces that were characterized by a non-Lambertian reflection, significant bidirectional variations in spectral radiances were found in all bands. The effectiveness of four illumination geometry-based topographic correction methods was evaluated. The results indicated that the empirical correction was the most effective method for all spectral bands in both solar and view directions, while the cosine correction gave the worst results. The C correction (in the solar direction) and the Minnaert correction reduced topographic effects, but not as effectively as the empirical correction. For the Lambertian, topographic effects were substantial only in the near infrared band in the solar direction. Bidirectional variations of spectral radiances in other bands and/or view directions were minimal and topographic corrections may not be necessary. None of these methods significantly changed the spatial variability of spectral radiances, although the histogram distributions were greatly modified by the cosine correction and the Minnaert correction. Copyright ISPRS Numéro de notice : A2008-116 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.isprsjprs.2007.08.004 En ligne : https://doi.org/10.1016/j.isprsjprs.2007.08.004 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29111 [article]

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Theory and reality of direct georeferencing in national coordinates / Jan Skaloud in ISPRS Journal of photogrammetry and remote sensing, vol 63 n° 2 (March - April 2008)  

Public [article]  inISPRS Journal of photogrammetry and remote sensing > vol 63 n° 2 (March - April 2008) . - pp 272 - 282 Titre : Theory and reality of direct georeferencing in national coordinates Type de document : Article/Communication Auteurs : Jan Skaloud, Auteur ; Klaus Legat, Auteur Année de publication : 2008 Article en page(s) : pp 272 - 282 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Photogrammétrie numérique [Termes IGN] correction des altitudes [Termes IGN] correction géométrique [Termes IGN] géoréférencement direct [Termes IGN] GPS-INS [Termes IGN] grande échelle [Termes IGN] orientation du capteur [Termes IGN] orientation externe [Termes IGN] petite échelle Résumé : (Auteur) This paper focuses on the transformation of the sensor's exterior orientation parameters obtained by direct georeferencing (DG) to national reference frames and their subsequent projection for mapping purposes. The required steps are explained and the emphasis is put on the minimization of distortions arising from the curvature of the earth and the inevitable length distortion of the map projection. We recall first the theoretical possibilities of dealing with the vertical distortions due to DG and then introduce a specifically developed technique for their compensation. Afterwards, we demonstrate the influence of such compensation on real examples of small- and large-scale mapping projects. Finally, we offer a comparison with two leading methods and show how these could benefit from extended modeling of the height correction. Copyright ISPRS Numéro de notice : A2008-117 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.isprsjprs.2007.09.002 En ligne : https://doi.org/10.1016/j.isprsjprs.2007.09.002 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29112 [article]

Exemplaires(1)

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081-08021	SL	Revue	Centre de documentation	Revues en salle	Disponible