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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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