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An integrated approach for modelling and global registration of point clouds / T. Rabbani in ISPRS Journal of photogrammetry and remote sensing, vol 61 n° 6 (February 2007)  

Public [article]  inISPRS Journal of photogrammetry and remote sensing > vol 61 n° 6 (February 2007) . - pp 355 - 370 Titre : An integrated approach for modelling and global registration of point clouds Type de document : Article/Communication Auteurs : T. Rabbani, Auteur ; S. Dijkam, Auteur ; et al., Auteur Année de publication : 2007 Article en page(s) : pp 355 - 370 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications photogrammétriques [Termes IGN] base de connaissances [Termes IGN] bâtiment industriel [Termes IGN] données laser [Termes IGN] jeu de données localisées [Termes IGN] lasergrammétrie [Termes IGN] matrice de covariance [Termes IGN] méthode des moindres carrés [Termes IGN] modélisation 3D [Termes IGN] reconstruction 3D du bâti [Termes IGN] semis de points [Termes IGN] superposition de données [Termes IGN] transformation de coordonnées Résumé : (Auteur) Point cloud acquisition by using laser scanners provides an efficient way for 3D as-built modelling of industrial installations. Covering such an installation with point cloud data often requires data acquisition from multiple standpoints. Before the actual modelling can start the transformation parameters of all scans need to be determined. Two methods to register point clouds of industrial scenes with different coordinate definitions are presented. Corresponding object models in different scans are used to determine the translation and rotation parameters of the scans. The first method, called Indirect method, is a two-step approach as object fitting and registration of the scenes is done separately. The second method, called Direct method simultaneously determines the shape and pose parameters of the objects as well as the registration parameters. Both methods are designed such that optimal use can be made of the knowledge of shapes present in industrial environments. Compared to ICP the presented approach combines registration and modelling and thus avoids the accumulation of errors. Furthermore, the simultaneous registration of multiple scans is possible. The presented approaches are based on non-linear least squares and provide quality measures in the form of covariance matrix of the estimated parameters, which can be used to decide if more scans are needed, and how and where they should be captured. Results are presented on some point cloud data-sets from actual industrial sites, where registration was done without using any artificial targets. Copyright ISPRS Numéro de notice : A2007-063 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.isprsjprs.2006.09.006 En ligne : https://doi.org/10.1016/j.isprsjprs.2006.09.006 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28428 [article]

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Building facade interpretation from uncalibrated wide-baseline image sequences / Helmut Mayer in ISPRS Journal of photogrammetry and remote sensing, vol 61 n° 6 (February 2007)  

Public [article]  inISPRS Journal of photogrammetry and remote sensing > vol 61 n° 6 (February 2007) . - pp 371 - 380 Titre : Building facade interpretation from uncalibrated wide-baseline image sequences Type de document : Article/Communication Auteurs : Helmut Mayer, Auteur ; S. Reznik, Auteur Année de publication : 2007 Article en page(s) : pp 371 - 380 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications photogrammétriques [Termes IGN] apprentissage dirigé [Termes IGN] bâtiment [Termes IGN] chaîne de Markov [Termes IGN] façade [Termes IGN] interprétation automatique [Termes IGN] mesure géométrique [Termes IGN] méthode de Monte-Carlo [Termes IGN] méthode des moindres carrés [Termes IGN] méthode robuste [Termes IGN] morphologie mathématique [Termes IGN] photogrammétrie terrestre [Termes IGN] reconstruction 3D du bâti Résumé : (Auteur) We propose an approach for building facade interpretation ranging from uncalibrated wide-baseline image sequences to the extraction of windows. The approach comprises several novel features, such as determination of the facade planes by robust least squares matching, learning of implicit shape models for objects, particularly windows, and the determination of the latter by means of Markov Chain Monte Carlo (MCMC) employing an abstraction hierarchy generated via mathematical morphology. Results for the fully automatic approach show its potential and shortcomings. Copyright ISPRS Numéro de notice : A2007-064 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.isprsjprs.2006.10.007 En ligne : https://doi.org/10.1016/j.isprsjprs.2006.10.007 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28429 [article]

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FFT-enhanced IHS transform method for fusing high-resolution satellite images / Y. Ling in ISPRS Journal of photogrammetry and remote sensing, vol 61 n° 6 (February 2007)  

Public [article]  inISPRS Journal of photogrammetry and remote sensing > vol 61 n° 6 (February 2007) . - pp 381 - 392 Titre : FFT-enhanced IHS transform method for fusing high-resolution satellite images Type de document : Article/Communication Auteurs : Y. Ling, Auteur ; Manfred Ehlers, Auteur ; et al., Auteur Année de publication : 2007 Article en page(s) : pp 381 - 392 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image optique [Termes IGN] analyse en composantes principales [Termes IGN] distorsion d'image [Termes IGN] fusion d'images [Termes IGN] image à résolution métrique [Termes IGN] image à résolution submétrique [Termes IGN] image à très haute résolution [Termes IGN] image Ikonos [Termes IGN] image multibande [Termes IGN] image panchromatique [Termes IGN] image Quickbird [Termes IGN] transformation intensité-teinte-saturation [Termes IGN] transformation rapide de Fourier [Termes IGN] valeur radiométrique Résumé : (Auteur) Existing image fusion techniques such as the intensity–hue–saturation (IHS) transform and principal components analysis (PCA) methods may not be optimal for fusing the new generation commercial high-resolution satellite images such as Ikonos and QuickBird. One problem is color distortion in the fused image, which causes visual changes as well as spectral differences between the original and fused images. In this paper, a fast Fourier transform (FFT)-enhanced IHS method is developed for fusing new generation high-resolution satellite images. This method combines a standard IHS transform with FFT filtering of both the panchromatic image and the intensity component of the original multispectral image. Ikonos and QuickBird data are used to assess the FFT-enhanced IHS transform method. Experimental results indicate that the FFT-enhanced IHS transform method may improve upon the standard IHS transform and the PCA methods in preserving spectral and spatial information. Copyright ISPRS Numéro de notice : A2007-065 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.isprsjprs.2006.11.002 En ligne : https://doi.org/10.1016/j.isprsjprs.2006.11.002 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28430 [article]

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Radiometric correction of hemispherical images / A. Kuusk in ISPRS Journal of photogrammetry and remote sensing, vol 61 n° 6 (February 2007)  

Public [article]  inISPRS Journal of photogrammetry and remote sensing > vol 61 n° 6 (February 2007) . - pp 405 - 413 Titre : Radiometric correction of hemispherical images Type de document : Article/Communication Auteurs : A. Kuusk, Auteur ; M. Paas, Auteur Année de publication : 2007 Article en page(s) : pp 405 - 413 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image [Termes IGN] angle de visée [Termes IGN] canopée [Termes IGN] capteur en peigne [Termes IGN] correction radiométrique [Termes IGN] diffusion du rayonnement [Termes IGN] filtre de déchatoiement [Termes IGN] filtre de Wiener [Termes IGN] forêt [Termes IGN] image hémisphérique [Termes IGN] radiance [Termes IGN] restauration d'image [Termes IGN] tâche image d'un point Résumé : (Auteur) Light scattering in fore-optics of imaging radiometric instruments degrades images, the signal of dark pixels is enhanced and that of bright pixels is reduced. A procedure of restoring hemispherical images obtained with a hemispheric view CCD-radiometer is suggested. The circular hemispheric image is projected onto the sphere and Wiener filtering on the sphere is performed. For building the Wiener filter the point spread function of the instrument was measured in the laboratory, and test images of (partially) controlled radiance were measured. The procedure is applied for the correction of hemispherical radiometric images taken under forest canopy. In non-corrected near infrared images the signal of sky pixels in forest canopy gaps near zenith is enhanced 1.4–2.0 times. The applied correction reduces this error to the level of 1.1–1.2. In the red channel these figures are 0.8–0.9 and 0.97–0.99, respectively. Copyright ISPRS Numéro de notice : A2007-066 Affiliation des auteurs : non IGN Thématique : FORET/IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.isprsjprs.2006.10.005 En ligne : https://doi.org/10.1016/j.isprsjprs.2006.10.005 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28431 [article]

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