Search results for "éclairage"
showing 5 items of 5 documents
Prendre en compte les usages pour mieux éclairer la nuit
2017
International audience; Prendre en compte les usages pour mieux éclairer la nuit Samuel Challéat et Dany Lapostolle L'éclairage urbain contemporain est renouvelé par les réflexions sur le développement durable. Si les préoccupations environnementales mettent en exergue les économies d'énergie et la réduction de la pollution lumineuse, la prise en compte des usages permet d'ajuster la lumière artificielle aux besoins. À la suite des travaux pionniers de Narboni et de Gwiazdzinski, Challéat et Lapostolle militent pour un urbanisme nocturne.
3D acquisition system for transparent objects
2010
This thesis deals with a new automated tridimensional inspection system for transparent surfaces, based on polarization analysis. We first present an extension of the ‘Shape from Polarization’ method for transparent surfaces. After being reflected, an unpolarized light wave becomes partially linearly polarized, depending on the surface normal and on the refractive index of the media it impinges on. Hence, by measuring the polarization parameters of the reflected light, the surface normals are computed. The ambiguity concerning the normal orientation is solved here with a multispectral lighting system. Finally, the description of the whole acquisition prototype is given as well as some exper…
(Ré)concilier éclairage urbain et environnement nocturne : les enjeux d’une controverse sociotechnique
2014
International audience; Our paper explains the birth of an environmental problem, i.e. light pollution, viewed as a socio-technical controversy. Supported by the actor-network approach, it traces over forty years the conditions of its emergence, transformation and dissemination to local, national and transnational levels and through various professional disciplines. Schematically, “environmentalists” uphold a holistic approach of “nocturnality” and define artificial light as a pollutant. Facing them, the “technicist” defends a segmented approach and defines artificial light as a nuisance. The introduction of this controversy into the political agenda leads to institutional decisions that gr…
Active lighting applied to three dimensional reconstruction of specular metallic surfaces by polarization imaging
2005
This thesis deals with a new automated tridimensional inspection system for specular metallic surfaces, based on polarization analysis. We first present an extension of the ‘Shape from Polarization' method for dielectric to metallic surfaces. After being reflected, an unpolarized light wave becomes partially linearly polarized, depending on the surface normal and on the refractive index of the media it impinges on. Hence, by measuring the polarization parameters of the reflected light, the surface normals are computed. The ambiguity concerning the normals orientation is solved here with a new active lighting system. Then, we describe and compare numerical methods for reconstructing the trid…
Patrimonialiser la nuit ? Une appropriation de la transition énergétique dans les territoires touristiques
2015
International audience