Concept
Réflectivité bidirectionnelle
Publications associées (74)
Accurate recovery of a specularity from a few samples of the reflectance function
Martin Vetterli, Ivan Dokmanic, Loïc Arnaud Baboulaz, Gilles Baechler
We present a new technique for estimating the specular peak of the bidirectional reflectance distribution function (BRDF) based on finite rate of innovation (FRI) sampling. The specular component of the BRDF varies rapidly, so it is challenging to acquire ...
Ieee2016Multilayer four-flux matrix model accounting for directional-diffuse light transfers
The four-flux model is a method to solve light radiative-transfer problems in planar, possibly multilayer structures. The light fluxes are modeled as two collimated and two diffuse beams propagating forward and backward perpendicularly to the layer stack. ...
Optical Soc Amer2016Image Based Relighting of Cultural Artifacts
By incorporating computational methods into the image acquisition pipeline, computational photography has opened up new avenues in the representation and visualization of real world objects in the digital world. For example, we can sample a scene under a f ...
EPFL2016Device for Determining a Bidirectional Reflectance Distribution Function of a Subject
Martin Vetterli, Loïc Arnaud Baboulaz, Gaël Georges Soudan
The present invention relates to a device (10) for determining a bidirectional reflectance distribution function of a subject (S) comprising: a light source (LS) for producing an incident light (li) and directing said incident light (li) onto a subject (S) ...
2016On-Board Vision-Based 3D Relative Localization System for Multiple Quadrotors
Alcherio Martinoli, Duarte Da Cruz Baptista Dias, Rodrigo Martins de Matos Ventura
This work proposes a novel relative localization system, based on active markers and an on-board camera, for tracking multiple quadrotors in a limited field of view. The system extracts the 3D poses of the markers including one that, by pulsating at a pred ...
Ieee2016Color Changing Prints on a Metallic Substrate
Printing on a flat metallic substrate has gained popularity in recent years. The reflection of light on a specularly reflecting metallic substrate differs strongly from the reflection of light on a diffusely reflecting medium such as paper. Direct prints o ...
EPFL2016Color reproduction, pattern hiding and image alternations with halftone prints on metal
We propose new methods for creating color or achromatic images that are printed with classical cyan, magenta, yellow and a white diffusing ink on a metallic substrate. We optimize the surface coverages of the cyan, magenta, yellow and white inks in order t ...
2016Transparent and Specular Object Reconstruction with a Plenoptic Camera
Over the past two decades, most techniques that have been developed are focused on opaque objects with Lambertian reflectance. For the transparent and specular objects, they have more complex light transport effect, which pose challenging problems for the ...
2015Yule-Nielsen based multi-angle reflectance prediction of metallic halftones
Spectral prediction models are widely used for characterizing classical, almost transparent ink halftones printed on a diffuse substrate. Metallic-ink prints however reflect a significant portion of light in the specular direction. Due to their opaque natu ...
Spie-Int Soc Optical Engineering2015Anisotropic Gaussian Mutations for Metropolis Light Transport Through Hessian-Hamiltonian Dynamics
The simulation of light transport in the presence of multi-bounce glossy effects and motion is challenging because the integrand is high dimensional and areas of high-contribution tend to be narrow and hard to sample. We present a Markov Chain Monte Carlo ...
ACM2015