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Surface mapping using image triplets: case studies benefit assessment in comparison to stereo image processing / H. Raggam in Photogrammetric Engineering & Remote Sensing, PERS, vol 72 n° 5 (May 2006)  

Public [article]  inPhotogrammetric Engineering & Remote Sensing, PERS > vol 72 n° 5 (May 2006) . - pp 551 - 563 Titre : Surface mapping using image triplets: case studies benefit assessment in comparison to stereo image processing Type de document : Article/Communication Auteurs : H. Raggam, Auteur Année de publication : 2006 Article en page(s) : pp 551 - 563 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image optique [Termes IGN] données topographiques [Termes IGN] fusion d'images [Termes IGN] image Ikonos [Termes IGN] image SPOT [Termes IGN] image tri-stéréoscopique [Termes IGN] modèle numérique de surface [Termes IGN] spatiocarte [Termes IGN] visualisation 3D Résumé : (Auteur) Mapping of the Earth's surface from satellite images is a continuing application in remote sensing, which has been distinctly pushed with the increasing availability of very high-resolution image data. In most of the missions, stereo images can be acquired making 3D mapping from space very attractive, as high accuracy and level of detail become feasible from such data. In this paper, several case studies are presented, which have been applied to stereo pairs acquired by the SPOT sensors as well as the very high-resolution Ikonos sensor. As an extension to standard stereo mapping, a 3D mapping approach which makes use of multiple image coverage is presented. For this work, image triplets including multi-sensor data sets have been used to extract 3D topography information and to generate digital surface models. The benefit of this extended approach is comparatively assessed with respect to results achieved from standard stereo mapping. Numéro de notice : A2006-151 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.14358/PERS.72.5.551 En ligne : https://doi.org/10.14358/PERS.72.5.551 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27878 [article]

High-resolution image fusion: methods to preserve spectral and spatial resolution / A. Svab in Photogrammetric Engineering & Remote Sensing, PERS, vol 72 n° 5 (May 2006)  

Public [article]  inPhotogrammetric Engineering & Remote Sensing, PERS > vol 72 n° 5 (May 2006) . - pp 565 - 572 Titre : High-resolution image fusion: methods to preserve spectral and spatial resolution Type de document : Article/Communication Auteurs : A. Svab, Auteur Année de publication : 2006 Article en page(s) : pp 565 - 572 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image optique [Termes IGN] analyse comparative [Termes IGN] fusion d'images [Termes IGN] image à haute résolution [Termes IGN] image à résolution submétrique [Termes IGN] image multibande [Termes IGN] image panchromatique [Termes IGN] image Quickbird [Termes IGN] qualité d'image [Termes IGN] transformation de Brovey [Termes IGN] transformation intensité-teinte-saturation Résumé : (Auteur) The main topic of this paper is high-resolution image fusion. The techniques used to merge high spatial resolution panchromatic images with high spectral resolution multispectral images are described. The most commonly used image fusion methods that work on the principle of component substitution (intensity-hue-saturation method (ms), Brovey transform (bt), and multiplicative method (multi)) have been applied to Ikonos, QuickBird, Landsat, and aerial orthophoto images. Visual comparison, histogram analyses, correlation coefficients, and difference images were used in order to analyze the spectral and spatial qualities of the fused images. It was discovered that for preserving spectral characteristics, one needs a high level of similarity between the panchromatic image and the respective multispectral intensity. In order to achieve this, spectral sensitivity of multispectral and panchromatic data was performed, and digital values in individual bands have been modified before fusion. It has also been determined that spatial resolution is best preserved in the event of an unchanged input panchromatic image. Numéro de notice : A2006-152 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.14358/PERS.72.5.565 En ligne : https://doi.org/10.14358/PERS.72.5.565 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27879 [article]

MTF-tailored multiscale fusion of high-resolution multispectral and panchromatic imagery / B. Aiazzi in Photogrammetric Engineering & Remote Sensing, PERS, vol 72 n° 5 (May 2006)  

Public [article]  inPhotogrammetric Engineering & Remote Sensing, PERS > vol 72 n° 5 (May 2006) . - pp 591 - 596 Titre : MTF-tailored multiscale fusion of high-resolution multispectral and panchromatic imagery Type de document : Article/Communication Auteurs : B. Aiazzi, Auteur ; S. Baronti, Auteur Année de publication : 2006 Article en page(s) : pp 591 - 596 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image optique [Termes IGN] données multiéchelles [Termes IGN] fonction de transfert de modulation [Termes IGN] fusion d'images [Termes IGN] image à haute résolution [Termes IGN] image multibande [Termes IGN] image panchromatique Résumé : (Auteur) This work presents a multiresolution framework for merging a multispectral image having an arbitrary number of bands with a higher-resolution panchromatic observation. The fusion method relies on the generalized Laplacian pyramid (glp), which is a multiscale, oversampled structure. The goal is to selectively perform injection of spatial frequencies from an image to another with the constraint of thoroughly retaining the spectral information of the coarser data. The novel idea is that a model of the modulation transfer functions (mtf) of the multispectral scanner is exploited to design the glp reduction filter. Thus, the interband structure model (ibsm), which is calculated at the coarser scale, where both MS and pan data are available, can be extended to the finer scale, without the drawback of the poor enhancement occurring when MTFs are assumed to be ideal filters. Experiments carried out on QuickBird data demonstrate that a superior spatial enhancement, besides the spectral quality typical of injection methods, is achieved by means of the MTF-adjusted fusion. Numéro de notice : A2006-153 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.14358/PERS.72.5.591 En ligne : https://doi.org/10.14358/PERS.72.5.591 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27880 [article]

Comparison of 3D physical and empirical models for generating DSMs from stereo HR images / Thierry Toutin in Photogrammetric Engineering & Remote Sensing, PERS, vol 72 n° 5 (May 2006)  

Public [article]  inPhotogrammetric Engineering & Remote Sensing, PERS > vol 72 n° 5 (May 2006) . - pp 597 - 604 Titre : Comparison of 3D physical and empirical models for generating DSMs from stereo HR images Type de document : Article/Communication Auteurs : Thierry Toutin , Auteur Année de publication : 2006 Article en page(s) : pp 597 - 604 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Photogrammétrie numérique [Termes IGN] analyse comparative [Termes IGN] compensation par faisceaux [Termes IGN] fonction linéaire [Termes IGN] image à haute résolution [Termes IGN] image Ikonos [Termes IGN] image Quickbird [Termes IGN] modèle numérique de surface [Termes IGN] modèle par fonctions rationnelles [Termes IGN] modèle physique [Termes IGN] modèle stéréoscopique Résumé : (Auteur) This research study addressed and compared 3D physical and empirical models for stereo-processing and the generation of digital surface models (DSMs) from different stereo high-resolution (HR) sensors (Ikonos and QuickBird). The 3D physical model is Toutin's Model (TM) developed at the Canada Centre for Remote Sensing, and the empirical model is the rational function model (RFM). The study also evaluated the conditions of experimentation to appropriately use these 3D models. The first results on stereo-bundle adjustments demonstrated that TM and vendor-supplied RFMs gave similar results with Ikonos as soon as RFM was refined with a shift computed from one GCP. On the other hand, TM gave better results than vendor-supplied RFMs with QuickBird regardless of the polynomial order and the number of GCPs. Due to its relief dependency, QuickBird RFM needed to be refined at least with linear functions computed from at least 6 to 10 GCPs. Some large errors were, however, noted on forward image RFM in column. The DSMs were then generated using an intensity matching approach and compared to 0.2 m accurate lidar elevation data. Because DSMs included the height of land-cover (trees, houses), elevation linear errors with 90 percent confidence level (LE90) were computed and compared for the entire area and three land-cover classes (forests, urban/ residential, bare surfaces). TM and vendor-supplied RFMs with Ikonos, regardless of the method and GCP number, achieved comparable results for all classes, while TM achieved overall better results than vendor-supplied RFMs with QuickBird. All results demonstrated the necessity of refining Ikonos RFM with a shift and one GCP only and QuickBird RFM with lst-order linear functions and 6 to 10 GCPs due to its relief dependency. Numéro de notice : A2006-154 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.14358/PERS.72.5.597 En ligne : https://doi.org/10.14358/PERS.72.5.597 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27881 [article]