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Fast SAR image restoration, segmentation, and detection of high-reflectance regions / E. Bratsolis in IEEE Transactions on geoscience and remote sensing, vol 41 n° 12 (December 2003)
[article]
Titre : Fast SAR image restoration, segmentation, and detection of high-reflectance regions Type de document : Article/Communication Auteurs : E. Bratsolis, Auteur ; M. Sigelle, Auteur Année de publication : 2003 Article en page(s) : pp 2890 - 2899 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image
[Termes IGN] champ aléatoire de Markov
[Termes IGN] chatoiement
[Termes IGN] classification
[Termes IGN] filtre numérique
[Termes IGN] histogramme
[Termes IGN] image ERS-SAR
[Termes IGN] itération
[Termes IGN] réflectance
[Termes IGN] restauration d'image
[Termes IGN] segmentation d'imageRésumé : (Auteur) An iterative filter that can be used for speckle reduction and restoration of synthetic aperture radar (SAR) images is presented here. This method can be considered as a first step in the extraction of other important information. The second step is the detection of high-reflectance regions and continues with the segmentation of the total image. We have worked in three-look simulated and real European Remote Sensing 1 satellite amplitude images. The iterative filter is based on a membrane model Markov random field approximation optimized by a synchronous local iterative method. The final form of restoration gives a total sum-preserving regularization for the pixel values of our image. The high-reflectance regions are defined as the brightest regions of the restored image. After the separation of this extreme class, we give a fast segmentation method using the histogram of the restored image. Numéro de notice : A2003-383 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1109/TGRS.2003.817222 En ligne : https://doi.org/10.1109/TGRS.2003.817222 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=26463
in IEEE Transactions on geoscience and remote sensing > vol 41 n° 12 (December 2003) . - pp 2890 - 2899[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 065-03121 RAB Revue Centre de documentation En réserve L003 Disponible Polarimetric SAR speckle noise model / C. Lopez-Martinez in IEEE Transactions on geoscience and remote sensing, vol 41 n° 10 (October 2003)
[article]
Titre : Polarimetric SAR speckle noise model Type de document : Article/Communication Auteurs : C. Lopez-Martinez, Auteur ; X. Fabregas, Auteur Année de publication : 2003 Article en page(s) : pp 2232 - 2242 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image radar et applications
[Termes IGN] bande L
[Termes IGN] chatoiement
[Termes IGN] filtrage du bruit
[Termes IGN] image radar moirée
[Termes IGN] matrice de covariance
[Termes IGN] polarimétrieRésumé : (Auteur) Synthetic aperture radar (SAR) data are affected by speckle noise, originated by the SAR system's coherent nature. The problem of speckle noise in one-dimensional (1-D) data is already solved, as speckle has a multiplicative characteristic. SAR polarimetry represents an extension to multidimensional data by the use of polarization wave diversity. As a consequence of the existence of a correlation degree between the SAR images, the 1-D speckle noise model cannot be extended to multidimensional SAR data. This paper is devoted to present a completely new speckle noise model for the complex covariance matrix describing polarimetric SAR data in the distributed scatterers case. As will be shown, this new model is able to identify which are the noise mechanisms in all the covariance matrix elements. The speckle noise model is validated by using real L-band polarimetric data acquired with the German E-SAR sensor. Numéro de notice : A2003-351 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1109/TGRS.2003.815240 En ligne : https://doi.org/10.1109/TGRS.2003.815240 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=26431
in IEEE Transactions on geoscience and remote sensing > vol 41 n° 10 (October 2003) . - pp 2232 - 2242[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 065-03101 RAB Revue Centre de documentation En réserve L003 Disponible Road vectors update using SAR imagery: a snake-based method / L. Bentabet in IEEE Transactions on geoscience and remote sensing, vol 41 n° 8 (August 2003)
[article]
Titre : Road vectors update using SAR imagery: a snake-based method Type de document : Article/Communication Auteurs : L. Bentabet, Auteur ; S. Jodouin, Auteur ; D. Ziou, Auteur ; J. Vaillancourt, Auteur Année de publication : 2003 Article en page(s) : pp 1785 - 1803 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Acquisition d'image(s) et de donnée(s)
[Termes IGN] chatoiement
[Termes IGN] contour
[Termes IGN] extraction du réseau routier
[Termes IGN] filtre de déchatoiement
[Termes IGN] mise à jour de base de données
[Termes IGN] virageRésumé : (Auteur) The paper presents an approach for roads detection based on synthetic aperture radar (SAR) images and road database The vectors provided by the database are refined using active contours (snakes). In this framework, we firstly develop a restoration filter based on the frost filter achieving an acceptable compromise between speckle elimination and lines preserving. This is followed by a line plausibility calculation step which is used to deform the snake from its initial location toward the final solution. The snake is reformulated using finite elements method. The setting of the snake parameters is not an obvious problem especially when they are tuned by trialanderror process. We propose a new automatic computational rule for the snake parameters. Our approach is validated by a series of tests on synthetic and SAR images. Numéro de notice : A2003-278 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1109/TGRS.2003.813850 En ligne : https://doi.org/10.1109/TGRS.2003.813850 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=22573
in IEEE Transactions on geoscience and remote sensing > vol 41 n° 8 (August 2003) . - pp 1785 - 1803[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 065-03081 RAB Revue Centre de documentation En réserve L003 Disponible Fusion radar and optical data for land cover mapping / Nathaniel D. Herold in Geocarto international, vol 17 n° 2 (June - August 2002)
[article]
Titre : Fusion radar and optical data for land cover mapping Type de document : Article/Communication Auteurs : Nathaniel D. Herold, Auteur ; Barry N. Haack, Auteur Année de publication : 2002 Article en page(s) : pp 19 - 27 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image mixte
[Termes IGN] analyse texturale
[Termes IGN] carte d'occupation du sol
[Termes IGN] chatoiement
[Termes IGN] classification dirigée
[Termes IGN] filtre de déchatoiement
[Termes IGN] image Landsat-TM
[Termes IGN] image multicapteur
[Termes IGN] image optique
[Termes IGN] image radar
[Termes IGN] précision relative
[Termes IGN] réalité de terrainRésumé : (Auteur) This study examined the complementarity of radar and optical data for feature identification. Spaceborne radar and Landsat Thematic Mapper (TM ) multispectral data sets were assessed independently and in combination to classify a site near Wad Medani, Sudan. Radar processing procedures included speckle reduction, texture extraction and postprocessing smoothing. Relative accuracy of the resultant classifications was established by comparison to ground truth information derived from field visitation. Neither speckle filtering nor postclassification smoothing were improvements over the poor results obtained with the unfiltered, original radar data. Texture measures were significant improvements over the original data (20 percent overall accuracy increase) and several, but not all, individual classes had excellent results. Landsat TM had good overall results (80 percent correct) but considerable spectral confusion between urban and bare soil. Combination of radar with Landsat TM greatly improved results, achieving near perfect classification of all individual classes. The systematic strategy of this study, determination of the best individual method before introducing the next procedure, itas effective in managing a complex set of analysis possibilities. Numéro de notice : A2002-225 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/10106040208542232 En ligne : https://doi.org/10.1080/10106040208542232 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=22139
in Geocarto international > vol 17 n° 2 (June - August 2002) . - pp 19 - 27[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 059-02021 RAB Revue Centre de documentation En réserve L003 Disponible Change detection for thematic mapping by means of airborne multitemporal polarimetric SAR imagery / W. Dierking in IEEE Transactions on geoscience and remote sensing, vol 40 n° 3 (March 2002)
[article]
Titre : Change detection for thematic mapping by means of airborne multitemporal polarimetric SAR imagery Type de document : Article/Communication Auteurs : W. Dierking, Auteur ; H. Skriver, Auteur Année de publication : 2002 Article en page(s) : pp 618 - 636 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Cartographie thématique
[Termes IGN] bande C
[Termes IGN] bande L
[Termes IGN] carte thématique
[Termes IGN] chatoiement
[Termes IGN] détection de changement
[Termes IGN] image radar
[Termes IGN] image radar moirée
[Termes IGN] polarimétrie
[Termes IGN] seuillage d'imageRésumé : (Auteur) The paper addresses the detection of changes in multitemporal polarimetric radar images, focusing on small objects and narrow linear features. The images were acquired at C- and L-band by the airborne EMISAR system. It is found that the radar intensities are better suited for change detection than the correlation coefficient and the phase difference between the co-polarized channels. In the case of linear features, there is no obvious difference between C- and L-band, and slight variations of the flight tracks are acceptable at look angles larger than 35 degrees. Theoretical detection thresholds are evaluated from the statistical distribution of the intensity ratio due to speckle. For the linear features and for urban environments, the observed thresholds are larger than the theoretical predictions. This is interpreted as an effect of radar intensity variations on length scales smaller than the spatial image resolution. The signature of urban areas is very sensitive to deviations between the flight tracks, and the sensitivity is larger at C-band than at L-band. On the other hand, the intensity contrast between buildings and the urban background is smaller at L-band and larger at C-band. For change detection, thresholds may have to be chosen separately for each object class because the intensity ratios of different object classes vary differently as a function of time. Numéro de notice : A2002-176 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1109/TGRS.2002.1000322 En ligne : https://ieeexplore.ieee.org/document/1000322 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=22091
in IEEE Transactions on geoscience and remote sensing > vol 40 n° 3 (March 2002) . - pp 618 - 636[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 065-02031 RAB Revue Centre de documentation En réserve L003 Disponible 065-02032 RAB Revue Centre de documentation En réserve L003 Disponible Exploitation des images RSO multi-dates et multi-incidences / S. Benghalem (2002)PermalinkEvaluation of "Mitch" hurricane damages in central America using satellite imagery / P. Romeijn (2001)PermalinkTraitement des images de RSO [Radar à Synthèse d'0uverture] / Henri Maître (2001)PermalinkPermalinkAnnales de stage, année universitaire 1995-1996 / Aurélie Bouillon (1996)PermalinkApport de la modélisation markovienne à l'étude multitemporelle d'images SAR / H. Pichon (1996)PermalinkContribution de données multi-temporelles à l'amélioration radiométrique et à l'utilisation d'images de radars à synthèse d'ouverture / J. Bruniquel (1996)PermalinkEtude multitemporelle d'images radar ERS-1 / Paul Leroy (1995)PermalinkApplications de la transformée en ondelettes et de l'analyse multirésolution au traitement des images de télédétection / Thierry Ranchin (1993)PermalinkPermalink