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Статті в журналах з теми "Ombres numériques":
Raux, Sophie, Christophe Renaud, François Rousselle, and Samuel Delepoulle. "L’apport de la simulation numérique de l’éclairage pour l’analyse des ombres projetées en peinture. Une application à la Dibutade de Joseph Benoît Suvée (1791)." Perspective, no. 1 (June 20, 2023): 173–98. http://dx.doi.org/10.4000/perspective.29536.
Martinet, Marie-Madeleine. "Ombres et transparences, de Vinci aux calques numériques." Sillages critiques, no. 14 (January 5, 2012). http://dx.doi.org/10.4000/sillagescritiques.2788.
Uhl, Magali. "Images." Anthropen, 2020. http://dx.doi.org/10.17184/eac.anthropen.126.
Дисертації з теми "Ombres numériques":
Chabanet, Sylvain. "Contributions aux ombres et jumeaux numériques dans l’industrie : proposition d’une stratégie de couplage entre modèles de simulation et d’apprentissage automatique appliquée aux scieries." Electronic Thesis or Diss., Université de Lorraine, 2023. http://www.theses.fr/2023LORR0131.
This thesis is part of the ANR project Lorraine-Artificial Intelligence, a multi-disciplinary project promoting research into both artificial intelligence itself, and its applications to other fields. As such, this thesis focuses on the development and use of machine learning models as a substitute for simulation models. Interest in this research topic is fueled by academic and industrial interest in the concept of digital shadows and twins, seen as an evolution of simulation models for long-term use at the heart of systems and processes. The main contribution of this thesis is the proposal of a coupling strategy between a simulation model and a surrogate model performing the same prediction task repeatedly on a data stream. The simulation model is assumed to have a high level of fidelity, but to be too slow or computationally expensive to be used alone to perform the full range of prediction required. The surrogate model is a fast machine-learning model that approximates the simulation model. The primary objective of the proposed coupling strategy is the efficient use of limited computational resources by intelligently allocating each prediction request to one of the two models. This allocation is, in particular, inspired by active learning and based on the evaluation of the level of confidence in the predictions of the machine learning model. Numerical experiments are first carried out on eight datasets from the scientific literature. An application to the sawmilling industry is then developed
Koulouris, Véronique. "Ombre et lumière dans la ville : le potentiel de l'image numérique pour l'exploration et l'analyse des ambiances lumineuses nocturnes." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/MQ62072.pdf.
Risson, Valéry. "Application de la morphologie mathématique à l'analyse des conditions d'éclairage des images couleurs." Paris, ENMP, 2001. https://pastel.archives-ouvertes.fr/pastel-00003315.
Penhoat, Hervé. "Mutation(s) du paysage contemporain : entre analogique et numérique : hors-champs, instants, non-lieu." Thesis, Paris 1, 2017. http://www.theses.fr/2017PA01H314.
We can be in one place in the world and take pictures of places located at hundreds of kilometers away. The distance, that up to now, used to be limited to our eyes’ perception, has no more limits, thanks to new technologies. This thesis analyzes the position of the artist in the treatment of landscape in view of the choices offered between analogue and digital.This would be the multiplicity of the technological possibilities, that through the hands of the artist, allows to mutate the contemporary landscape. According to our hypothesis, the Mutation(s) of contemporary landscape, would not be based exclusively on a temporal continuity, following the technological evolution, that progressively forgets the analogue in favor of the digital. There would be this In Between that would be at the center of our questioning. The thesis develops itself in 3 parts, like a sort a tryptique: off-track - instants - out of place, based on our practice as artist. Departing from our Brittany origins, we will immerse into the Celtic legends (the “Anaon”, the “intersigne”, etc.) and cultures that will take us to Asia (the “evaporated” in Japan, etc.), shifting between the technologies, between the visible and the invisible, between the real and the virtual.In the end, the mutation (in plural) is one and many at the same time. This complex representation (in the sense of Edgar Morin) reminds that of Yi-Jin, of which his definition suggests the relationship between signs. It is not without the proximity of the Oghamic writing, that is an ancient Celtic alphabet. Our position is that the Ogham, in connection with the Yi-Jin, would be part of a new definition of the contemporary landscape
Larvy, delariviere Ulysse. "Orientation automatique de carte d'environement autour d'une scene locale." Thesis, Reims, 2019. http://www.theses.fr/2019REIMS024.
In this thesis, we have presented a method to register an environment map with a local scene automatically.In the literature, many methods need to orient the environmental map to be coherent with a local scene. This orientation is mostly done manually by a user. We present a method to register an environment map with a local scene automatically. A characteristic of our approach is that we do not need to create a complete 3D model of the local scene or have interaction with the user. Moreover, we are making simple assumptions.We propose a pipeline to create a virtual representation of the scene using our input data. This representation includes the global scene represented by the environment map and the local scene represented by a reference object and its shadow.By using the knowledge of the position of the main light source on the environment map, we can simulate the lighting and project a computed shadow on the ground. It is possible to compare the computed shadow shape with the input one to recover the correct position of the main light source. The final orientation of the environment map is directly related to the position of this main light source.We provide an evaluation of the proposed approach by calculating two metrics that compare our angle estimate with actual ground truth directions. Our orientation estimation shows that our method recovers a correct environment map orientation.In this thesis, we are interested in real input data. The environment map and the local scene are extracted from photographs or videos, which already contain a lighting rendering. It is therefore important to orient the environment map in a way that is consistent with the existing lighting in the local scene.We propose an automatic method, to orient an environment map to a local scene. This method is inspired by the behavior of light, drawing rays of light towards an object and attempting to match two shadows, one given as input and one calculated.We also use 3D data from the object we are considering. The originality is that we base our method on the way light behaves in order to calculate and match shadows. By matching the shadows, we can estimate the correct position of the environment map
Lamy, Frédéric. "Theoretical and phenomenological aspects of non-singular black holes." Thesis, Sorbonne Paris Cité, 2018. http://www.theses.fr/2018USPCC203/document.
The issue of singularities in General Relativity dates back to the very first solution to the equations of the theory, namely Schwarzschild's 1915 black hole. Whether they be of coordinate or curvature nature, these singularities have long puzzled physicists, who managed to better characterize them in the late 60's. This led to the famous singularity theorems applying both to cosmology and black holes, and which assume a classical behaviour of the matter content of spacetime summarized in the so-called energy conditions. The violation of these conditions by quantum phenomena supports the idea that singularities are to be seen as a limitation of General Relativity, and would be cured in a more general theory of quantum gravity. In this thesis, pending for such a theory, we aim at investigating black hole spacetimes deprived of any singularity as well as their observational consequences. To that purpose, we consider both modifications of General Relativity and the coupling of Einstein's theory to exotic matter contents. In the first case, we show that one can recover the static spherically symmetric non-singular black holes of Bardeen and Hayward in principle in mimetic gravity, and implicitly by a deformation of General Relativity's hamiltonian constraint in an approach based on loop quantum gravity techniques. In the second case, we stay inside the framework of General Relativity and consider effective energy-momentum tensors associated with a fully regular rotating Hayward metric and with a dynamical spacetime describing the formation and evaporation of a non-singular black hole. For the latter, we show that all models based on the collapse of ingoing null shells and willing to describe Hawking’s evaporation are doomed to violate the energy conditions in a non-compact region of spacetime. Lastly, the theoretical study of the rotating Hayward metric comes with numerical simulations of such an object at the center of the Milky Way, using the ray-tracing code Gyoto and mimicking the known properties of the accretion structure of Sgr A*. These simulations allow exhibiting the two very different regimes of the metric, with or without horizon, and emphasize the difficulty of asserting the presence of a horizon from strong-field images as the ones provided by the Event Horizon Telescope
Книги з теми "Ombres numériques":
Eisemann, Elmar. Real-time shadows. Boca Raton: CRC Press, 2011.
Michael, Schwarz, Michael Wimmer, Elmar Eisemann, and Ulf Assarsson. Real-Time Shadows. CRC Press LLC, 2016.
Michael, Schwarz, Michael Wimmer, Elmar Eisemann, and Ulf Assarsson. Real-Time Shadows. Taylor & Francis Group, 2020.
Michael, Schwarz, Michael Wimmer, Elmar Eisemann, and Ulf Assarsson. Real-Time Shadows. CRC Press LLC, 2016.
Image Synthesis Theory and Practice. Springer Verlag, 1988.
Частини книг з теми "Ombres numériques":
Rouet, Gilles. "VII. Livres et lecture dans un monde numérique." In Lumières, ombres et trémulations, 377–85. Hermann, 2022. http://dx.doi.org/10.3917/herm.dion.2022.01.0377.