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You searched for subject:(Photon maps). Showing records 1 – 3 of 3 total matches.

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1. Perrot, Romuald. Lobes de cosinus et visibilité pour la simulation d'éclairage : Cosine lobes and visibility for lighting simulation.

Degree: Docteur es, Informatique et application, 2012, Poitiers

La simulation des réflexions lumineuses multiples à l'intérieur d'un environnement nécessite de résoudre une intégrale de premier ordre, récursive infinie, pour laquelle il n'existe pas de solution analytique dans le cas général. Certaines méthodes permettent de donner une solution théorique exacte, mais avec des temps de calcul trop important pour espérer produire plusieurs images par seconde dans un avenir proche. De nombreuses méthodes permettent de réaliser ces calculs de manière plus rapide, mais elles reposent sur des approximations dont les effets sont souvent visibles sur les images produites. Notre objectif est de proposer des solutions permettant de réduire les erreurs de calculs en exploitant deux approches complémentaires : (i) une homogénéisation des termes de l'équation de manière à la résoudre seulement à l'aide de quelques opérateurs simples ; (ii) la prise en compte précise des informations de visibilité pour réduire le biais des méthodes reposant sur une estimation de densité. A terme, notre objectif est de diminuer le coût des requêtes de visibilité de nos deux contributions. Pour cela nous envisageons notamment d'introduire des calculs hiérarchiques de visibilité de façon à amortir le coût global des requêtes.

Simulating light transfer within a virtual environment requires to solve a first order, infinite recursive integral, that unfortunately doesn't have any solution in general cases. Though theoretically exact solutions exist, their computing time is not adapted to real-time rendering in a near future. Many methods have been proposed for accelerating these computations, but they rely on approximations that often produce visible artifacts on the resulting images. Our goal is to propose some new solutions that can reduce biases with two complementary approaches : (i) a new homogeneous representation of each term of the equation can be used to resolve it using only simple operators ; (ii) considering precise visibility information in order to reduce bias of methods that rely on density estimation. On the long range, we aim at reducing visibility requests costs of each contribution. For that purpose, we particularly plan to introduce hierarchical visibility computations so as to amortize queries cost.

Advisors/Committee Members: Meneveaux, Daniel (thesis director), Aveneau, Lilian (thesis director).

Subjects/Keywords: Simulation d'éclairage; Lobes de cosinus; Visibilité; Cartes de photons; Lighting simulation; Cosine lobes; Visibility; Photon maps; 006.6

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APA (6th Edition):

Perrot, R. (2012). Lobes de cosinus et visibilité pour la simulation d'éclairage : Cosine lobes and visibility for lighting simulation. (Doctoral Dissertation). Poitiers. Retrieved from http://www.theses.fr/2012POIT2304

Chicago Manual of Style (16th Edition):

Perrot, Romuald. “Lobes de cosinus et visibilité pour la simulation d'éclairage : Cosine lobes and visibility for lighting simulation.” 2012. Doctoral Dissertation, Poitiers. Accessed September 23, 2019. http://www.theses.fr/2012POIT2304.

MLA Handbook (7th Edition):

Perrot, Romuald. “Lobes de cosinus et visibilité pour la simulation d'éclairage : Cosine lobes and visibility for lighting simulation.” 2012. Web. 23 Sep 2019.

Vancouver:

Perrot R. Lobes de cosinus et visibilité pour la simulation d'éclairage : Cosine lobes and visibility for lighting simulation. [Internet] [Doctoral dissertation]. Poitiers; 2012. [cited 2019 Sep 23]. Available from: http://www.theses.fr/2012POIT2304.

Council of Science Editors:

Perrot R. Lobes de cosinus et visibilité pour la simulation d'éclairage : Cosine lobes and visibility for lighting simulation. [Doctoral Dissertation]. Poitiers; 2012. Available from: http://www.theses.fr/2012POIT2304

2. Puentes, Graciana. Classical and quantum scattering in optical systems.

Degree: 2007, Physics Department/ Huygens Laboratory/ Quantum Optics Group, Faculty of Mathematics and Natural Sciences, Leiden University

The central topic of the Thesis concerns light scattering experiments with entangled photons. Specifically, we study the effect of scattering processes on polarization-entanglement of twin-photons. The main idea is that scattering generally couples polarization and spatial degrees of freedom of photons. The details of this coupling depend on the characteristics of the scattering medium. Such coupling, in turn, can reduce the entanglement of twin-photons, if the photon pairs are detected in a momentum-insensitive way. We have investigated a broad range of optical scattering media ranging from milk to polymer fibers. By manipulating the parameters of these samples we were able to generate a broad range of quantum states, proving for the first time that scattering processes are a substantial tool for mixed-state engineering. This is of great importance for quantum information since any real-world application thereof has to deal with mixed (as opposed to pure) states.

Subjects/Keywords: Causality; Entanglement; Light scattering; Quantum maps; Twin-photon; Causality; Entanglement; Light scattering; Quantum maps; Twin-photon

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Puentes, G. (2007). Classical and quantum scattering in optical systems. (Doctoral Dissertation). Physics Department/ Huygens Laboratory/ Quantum Optics Group, Faculty of Mathematics and Natural Sciences, Leiden University. Retrieved from http://hdl.handle.net/1887/11956

Chicago Manual of Style (16th Edition):

Puentes, Graciana. “Classical and quantum scattering in optical systems.” 2007. Doctoral Dissertation, Physics Department/ Huygens Laboratory/ Quantum Optics Group, Faculty of Mathematics and Natural Sciences, Leiden University. Accessed September 23, 2019. http://hdl.handle.net/1887/11956.

MLA Handbook (7th Edition):

Puentes, Graciana. “Classical and quantum scattering in optical systems.” 2007. Web. 23 Sep 2019.

Vancouver:

Puentes G. Classical and quantum scattering in optical systems. [Internet] [Doctoral dissertation]. Physics Department/ Huygens Laboratory/ Quantum Optics Group, Faculty of Mathematics and Natural Sciences, Leiden University; 2007. [cited 2019 Sep 23]. Available from: http://hdl.handle.net/1887/11956.

Council of Science Editors:

Puentes G. Classical and quantum scattering in optical systems. [Doctoral Dissertation]. Physics Department/ Huygens Laboratory/ Quantum Optics Group, Faculty of Mathematics and Natural Sciences, Leiden University; 2007. Available from: http://hdl.handle.net/1887/11956


Brno University of Technology

3. Nečas, Ondřej. Photon mapping .

Degree: 2009, Brno University of Technology

V rámci této práce byla provedena praktická implementace algoritmu photon mapping. Pro dosažení kvalitnějšího výstupu byly zkoumány některé základní a pokročilejší metody globálního osvětlení. Tyto náročné algoritmy jsou často prakticky nepoužitelné a je nutná jejich optimalizace. Základem praktické implementace je optimalizace raytraceru. Vzorky nepřímého difuzního osvětlení počítané metodou Monte Carlo je možné mezi sebou interpolovat s použitím vhodné techniky.; This thesis deals with practical implementation of photon mapping algorithm. To achieve better results some basic and some more advanced methods of global illumination has been examined. These time demanding algorithms are often practically unusable and their further optimization is necessary. Optimized ray tracer is essential for practical implementation. Computing diffuse interreflection by Monte Carlo sampling is also very time demanding operation. Therefore it is appropriate to use it along with proper interpolation. Advisors/Committee Members: Herout, Adam (advisor).

Subjects/Keywords: globální osvětlení; photon mapping; sledování paprsku; světelné mapy; kd-strom; final gathering; irradiance caching; kaustiky; global illumination; photon mapping; ray tracing; light maps; kd-tree; final gathering; irradiance caching; caustics

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Nečas, O. (2009). Photon mapping . (Thesis). Brno University of Technology. Retrieved from http://hdl.handle.net/11012/53890

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Nečas, Ondřej. “Photon mapping .” 2009. Thesis, Brno University of Technology. Accessed September 23, 2019. http://hdl.handle.net/11012/53890.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Nečas, Ondřej. “Photon mapping .” 2009. Web. 23 Sep 2019.

Vancouver:

Nečas O. Photon mapping . [Internet] [Thesis]. Brno University of Technology; 2009. [cited 2019 Sep 23]. Available from: http://hdl.handle.net/11012/53890.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Nečas O. Photon mapping . [Thesis]. Brno University of Technology; 2009. Available from: http://hdl.handle.net/11012/53890

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

.