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Spectral or spatial quality for used satellite imagery? A trade-off solution using the wavelet a trous algorithm / M. Lillo-Saavedra in International Journal of Remote Sensing IJRS, vol 27 n°7-8 (April 2006)  

Public [article]  inInternational Journal of Remote Sensing IJRS > vol 27 n°7-8 (April 2006) . - pp 1453 - 1464 Titre : Spectral or spatial quality for used satellite imagery? A trade-off solution using the wavelet a trous algorithm Type de document : Article/Communication Auteurs : M. Lillo-Saavedra, Auteur ; C. Gonzalo, Auteur Année de publication : 2006 Article en page(s) : pp 1453 - 1464 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image optique [Termes IGN] algorithme à trous [Termes IGN] fusion d'images [Termes IGN] image multibande [Termes IGN] image panchromatique [Termes IGN] qualité des données [Termes IGN] transformation en ondelettes Résumé : (Auteur) Several different methods for the fusion of multispectral and panchromatic images based on the wavelet transform have been proposed. The majority provide satisfactory results, but there is one, the a trous algorithm, that presents several advantages over the other fusion methods. Its computation is very simple; it only involves elementary algebraic operations, such as products, differences and convolutions. It yields a better spatial and spectral quality than the other methods. Standard fusion methods do not allow control of the spatial and spectral quality of the fused image; high spectral quality implies low spatial quality and vice versa. This paper proposes a new version of a fusion method based on the wavelet transform, computed through the a trous algorithm, that permits customization of the trade-off between the spectral and spatial quality of the fused image through the evaluation of two quality indices: a spectral index (the ERGAS index) and a spatial one. For the latter, a new spatial index based on ERGAS concepts and translated to the spatial domain has been defined. In addition, several different schemes for the computation of the fusion method investigated have been evaluated to optimize the degradation level of the source image required to perform the fusion process. The performance of the proposed fusion method has been compared with the fusion methods based on wavelet Mallat and filtering in the Fourier domain. Numéro de notice : A2006-158 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/01431160500462188 En ligne : https://doi.org/10.1080/01431160500462188 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27885 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
080-06041	RAB	Revue	Centre de documentation	En réserve L003	Disponible

A new wavelet-based image fusion method for remotely sensed data / C. Yunhao in International Journal of Remote Sensing IJRS, vol 27 n°7-8 (April 2006)  

Public [article]  inInternational Journal of Remote Sensing IJRS > vol 27 n°7-8 (April 2006) . - pp 1465 - 1476 Titre : A new wavelet-based image fusion method for remotely sensed data Type de document : Article/Communication Auteurs : C. Yunhao, Auteur ; D. Lei, Auteur Année de publication : 2006 Article en page(s) : pp 1465 - 1476 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image optique [Termes IGN] analyse comparative [Termes IGN] analyse en composantes principales [Termes IGN] fusion d'images [Termes IGN] image à haute résolution [Termes IGN] image Landsat-TM [Termes IGN] image SPOT [Termes IGN] ondelette [Termes IGN] qualité des données [Termes IGN] transformation intensité-teinte-saturation Résumé : (Auteur) The preservation of spectral characteristics and the retention of high spatial resolution are two key issues in image fusion. Different applications may require different balances between the two. However, the limitation is that only one fused result is possible for most of the commonly used fusion methods; users have no control over how much spatial detail or spectral information should be retained. Both quantitative and qualitative criteria, including mean, standard deviation, entropy, average gradient, spectral distortion, correlation coefficient and visual assessment, were used to evaluate the performance of the proposed fuser. A SPOT (Satellite Pour l'Observation de la Terre) panchromatic image and Landsat Thematic Mapper (TM) images were employed in the evaluation. The results show that the proposed method is slightly better than, or comparable to, commonly used image fusion methods, including Intensity-Hue-Saturation (IHS), principal component analysis (PCA), and two other wavelet-based fusion methods with replacement and with selection strategies, in terms of spectral characteristic preservation and high spatial resolution retention. Moreover, the proposed method can achieve a wide range of balances between spectral characteristic preservation and high spatial resolution retention, and thus is applicable in different applications. Numéro de notice : A2006-159 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/01431160500474365 En ligne : https://doi.org/10.1080/01431160500474365 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27886 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
080-06041	RAB	Revue	Centre de documentation	En réserve L003	Disponible

Using characteristic spectral bands of OMIS1 imaging spectrometer to retrieve urban land surface temperature / S.Y. Zhu in International Journal of Remote Sensing IJRS, vol 27 n°7-8 (April 2006)  

Public [article]  inInternational Journal of Remote Sensing IJRS > vol 27 n°7-8 (April 2006) . - pp 1661 - 1676 Titre : Using characteristic spectral bands of OMIS1 imaging spectrometer to retrieve urban land surface temperature Type de document : Article/Communication Auteurs : S.Y. Zhu, Auteur ; Q. Yin, Auteur ; et al., Auteur Année de publication : 2006 Article en page(s) : pp 1661 - 1676 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de télédétection [Termes IGN] bande spectrale [Termes IGN] corrélation automatique de points homologues [Termes IGN] modèle de régression [Termes IGN] réflectance [Termes IGN] Shanghai (Chine) [Termes IGN] température de surface Résumé : (Auteur) According to the reflectance spectra of various materials, this paper mainly studies the relations between inherent features indicated by different combinations of characteristic spectral bands and surface temperature for five land surface cover types in the Shanghai area. On the basis of above-analysis results, we used the built optimum regression models to retrieve surface temperature, and then the precision and feasibility of the correlation method were evaluated. Results show that a clear and high correlativity exists between characteristic spectral bands and surface temperature. The maximum error is about 2.0 K by using correlation models to estimate urban land surface temperature, and main error of retrieved temperature results from mistakenly classification and existent mixture pixels. This indicates that characteristic spectral bands can be used as a modulating parameter for the estimation of surface temperature. Numéro de notice : A2006-160 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/01431160500462147 En ligne : https://doi.org/10.1080/01431160500462147 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27887 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
080-06041	RAB	Revue	Centre de documentation	En réserve L003	Disponible

Automatic extraction of wind erosion obstacles by integration of GIS data, DSM and stereo images / Y. Zhang in International Journal of Remote Sensing IJRS, vol 27 n°7-8 (April 2006)  

Public [article]  inInternational Journal of Remote Sensing IJRS > vol 27 n°7-8 (April 2006) . - pp 1677 - 1690 Titre : Automatic extraction of wind erosion obstacles by integration of GIS data, DSM and stereo images Type de document : Article/Communication Auteurs : Y. Zhang, Auteur ; Christian Heipke, Auteur ; et al., Auteur Année de publication : 2006 Article en page(s) : pp 1677 - 1690 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications SIG [Termes IGN] données multisources [Termes IGN] érosion éolienne [Termes IGN] extraction automatique [Termes IGN] intégration de données [Termes IGN] modèle numérique de surface [Termes IGN] modèle stéréoscopique [Termes IGN] protection de l'environnement [Termes IGN] segmentation d'image [Termes IGN] système d'information géographique Résumé : (Auteur) Integrating multiple data sources is a very important strategy to obtain relevant solutions in geo-scientific analysis. This paper mainly deals with the integration of Geographical Information System (GIS) data, stereo aerial imagery and a Digital Surface Model (DSM) to extract wind erosion obstacles (namely tree rows and hedges) in open landscapes. Different approaches, such as image segmentation, edge extraction, linking, grouping and 3-dimensional verification with the DSM, are combined to extract the objects of interest. Experiments show that most wind erosion obstacles can be successfully extracted by the developed system. Numéro de notice : A2006-161 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/01431160500406896 En ligne : https://doi.org/10.1080/01431160500406896 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27888 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
080-06041	RAB	Revue	Centre de documentation	En réserve L003	Disponible