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Visibility monitoring using conventional roadside cameras : Emerging applications / Raouf Babari in Transportation Research - Part C: Emerging Technologies, vol 22 (June 2012)  

Public [article]  inTransportation Research - Part C: Emerging Technologies > vol 22 (June 2012) . - pp 17 - 28 Titre : Visibility monitoring using conventional roadside cameras : Emerging applications Type de document : Article/Communication Auteurs : Raouf Babari, Auteur ; Nicolas Hautière, Auteur ; Eric Dumont, Auteur ; Nicolas Paparoditis , Auteur ; James Misener, Auteur Année de publication : 2012 Article en page(s) : pp 17 - 28 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications photogrammétriques [Termes IGN] autoroute [Termes IGN] caméra numérique [Termes IGN] données météorologiques [Termes IGN] qualité de l'air [Termes IGN] régression non linéaire [Termes IGN] sécurité routière [Termes IGN] visibilité (optique) Résumé : (auteur) The measurement of atmospheric visibility is an important element for road and air transportation safety. We propose in this paper a novel estimator of the atmospheric visibility by already existing conventional highway cameras, with a technique based on the gradient magnitude selected by applying Lambert’s law with respect to changes in lighting conditions. The response of this estimator is calibrated by non-linear regression with data from a visibility meter installed in a test site which has been instrumented with a camera. Through our technique, atmospheric visibility estimates are obtained with an average error of 30% for images taken in the day, with sky luminance between 10 and 8000 cd m−2 and visibility distances up to 15 km. Our results allow us to envision practical implementation on roadsides in the near future to determine local visibility for the benefit of road safety, meteorological observation and air quality monitoring. Numéro de notice : A2012-744 Affiliation des auteurs : MATIS+Ext (1993-2011) Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.trc.2011.11.012 Date de publication en ligne : 29/11/2011 En ligne : https://doi.org/10.1016/j.trc.2011.11.012 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=91508 [article]