Concept

Per-pixel lighting

Related publications (15)

RAP: 3D Rasterization Augmented End-to-End Planning

Imitation learning for end-to-end driving trains policies only on expert demonstrations. Once deployed in a closed loop, such policies lack recovery data: small mistakes cannot be corrected and quickly compound into failures. A promising direction is to generate alternative viewpoints and trajectories beyond the logged path. Prior work explores photorealistic digital twins via neural rendering or game engines, but these methods are prohibitively slow and costly, and thus mainly used for evaluation. In this

2026

Accelerate Radiative Transfer Simulations for the Cosmic Epoch of Reionisation

The most time-consuming part of radiative transfer cosmological simulations for the Epoch of Reionisation is the ray-tracing algorithm. This involves computing the hydrogen column density along the path of the ionising photons. In this work, we present an updated version of pyC2Ray1, a massively parallel ray-tracing and chemistry library that supersedes C2Ray which has been extensively employed in reionisation simulations and often requires millions of CPU-core hours across several thousand computing nodes

ACM2026

The physics of GaN-based light-emitting diodes

The past three decades have witnessed substantial progress in the performance of GaN-based light-emitting diodes. GaN light-emitting diodes, combined with wavelength-converting materials, enable highly efficient white-light sources that have caused a revolution in lighting applications, reaching more than 50% market adoption in the USA. This Review article discusses the underlying physics of GaN-based light-emitting diodes, focusing on how the quantum efficiency of the active region is affected by three key

Nature Research2026

Visible light-emitting host-guest electrochemical cells using cyanine dyes

Frank Nüesch, Jakob Heier, Lei Wang, Surendra Babu Anantharaman

Light-emitting electrochemical cells (LECs) can be fabricated as a single emissive organic/salt layer sandwiched between two electrodes, offering cost-effective next generation signage and lighting applications. Cyanine dyes are especially attractive to ex ...

Elsevier Science Bv2017

3D geometry recovery from structured light system

3D scanning is a technique that permits to recover the pixel depth and thus, the three-dimensional shape of an object. This technique is well known since about 25 years ago, but we have seen it coming back recently due to the rapid progress in image processing technology (availability of hight resolution cameras, increase in computing power or increase of storage capacity for example, see \cite{hist}). A 3D scanner works relatively similar as a camera but it measures the depth along the color for every pixe

2015

Benefits of a translucent building envelope made of DSC-integrated glass blocks

The aim of this paper is to analyse the benefits deriving from the replacement of the glazed façades of an office building located in Palermo (Sicily) with a new translucent BIPV envelope made of multifunctional glass block panels integrated with Dye-sensitized Solar Cells (DSCs). The analysed 11-storey building is cladded by a curtain wall determining high management costs, especially during summer, in order to maintain indoor comfort. After the design of the building envelope and of the components for the

Economic Forum2015

Les mécanismes de lumière naturelle: analyse des bibliothèques d'Alvar Aalto. (Prix IBE-BIV 2013, Institut Belge de l'éclairage, affilié à la CIE)

Today, the challenges of sustainable development require revisiting all the parameters of architectural design. According to the International Energy Agency , in 2005, 19% of the electricity produced in the world was consumed for lighting. We know that the benefits of natural photons are much better than the blue light of the fluorescent lamps, or the bad chromatic rendering of the LEDs. Daylighting is an aspect which must not be overlooked to face the challenges of sustainable development. To this is added

2014

Simulating Daylight Propagation through Complex Fenestration Systems in a Urban Context Using Variable Sampling Subdivision Scheme

Jean-Louis Scartezzini

The use of Complex Fenestration Systems (CFS) within buildings can contribute to a significant reduction of cooling loads by the way of two assets: the redirection of daylight and the shading of sunrays. In order to back-up these features, daylight performance evaluations need to be performed individually in each case according to the geographical location, outdoor conditions, building orientation and design as well as indoor material properties. The use of computer simulations can make this assessment easi

EPFL Solar Energy and Building Physics Laboratory (LESO-PB)2013

Green Lighting - Energy-Efficient Integrated Lighting Systems

Jean-Louis Scartezzini

The objective of the Green Lighting project was to develop a High Performance Integrated Lighting System, based on advanced technologies for day- and electric lighting, achieving a Lighting Power Density (LPD) that does not exceed 3 W/m2. The project has revealed that Anidolic Daylighting Systems (ADS) are an ideal basis for High Performance Integrated Lighting Systems. Not only are they able to provide adequate illumination (i.e. sufficiently high illuminances) in office rooms during large fractions of nor

2009

Adapting the Sample Size in Texture Synthesis

Sabine Süsstrunk, Luciano Sbaiz

Starting from a sample of a given size, texture synthesis algorithms are used to create larger texture images. A good algorithm produces synthesized textures that are pixelwise different but perceptually indistinguishable from the original image. The sample image should be chosen ensuring that it contains a number of pattern repetitions sufficient to produce valuable synthesis results. Since textures can be characterized by patterns of different dimensions, this must be done in an adaptive way. In this arti

2005

Outlier modeling in image matching

Martin Vetterli, Sabine Süsstrunk, Luciano Sbaiz, David Hasler

We address the question of how to characterize the outliers that may appear when matching two views of the same scene. The match is performed by comparing the difference of the two views at a pixel level, aiming at a better registration of the images. When using digital photographs as input, we notice that an outlier is often a region that has been occluded, an object that suddenly appears in one of the images, or a region that undergoes an unexpected motion. By assuming that the error in pixel intensity le

2003

Directional multiresolution image representations

Minh Do

Efficient representation of visual information lies at the foundation of many image processing tasks, including compression, filtering, and feature extraction. Efficiency of a representation refers to the ability to capture significant information of an object of interest in a small description. For practical applications, this representation has to be realized by structured transforms and fast algorithms. Recently, it has become evident that commonly used separable transforms (such as wavelets) are not nec

EPFL2002

Object-Centered Surface Reconstruction: Combining Multi-Image Stereo and Shading

Pascal Fua

Our goal is to reconstruct both the shape and reflectance properties of surfaces from multiple images. To this end, we introduce an object-centered representation, specifically, a hexagonally-connected 3-D mesh of vertices with triangular facets. Such a representation accommodates the two classes of information mentioned above, as well as multiple images, self-occlusions and geometric constraints. We have chosen to model the surface material using the Lambertian reflectance model with variable albedo. Conse

Springer Verlag1995

Endoscopic tissue fluorescence life-time imaging by frequency domain light-induced fluorescence

Hubert van den Bergh, Georges Wagnières

An instrumentation is being developed to draw a fluorescence life-time map of tissue endoscopically. This fluorescence life-time of an endogenous or exogenous fluorochrome gives information about the physico-chemical environment which is thought to vary between normal and diseased tissue. The excitation light from a cw laser is modulated in amplitude at high frequencies by an electro-optic modulator and delivered to the endoscopic site through an optical fiber. The image of the tissue is spectrally split in

1995

Rendering hair using pixel blending and shadow buffers

Daniel Thalmann

A technique is described for adding natural-looking hair to standard rendering algorithms. Using an explicit hair model, in which each individual hair is represented by a three-dimensional curve, the technique uses pixel blending combined with Z-buffer and shadow buffer information from the scene to yield a final anti-aliased image with soft shadows. Although developed for rendering human hair, this technique can also be used to render any model consisting of long filaments of sub-pixel width. The technique

1991

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Related publications (15)

Les mécanismes de lumière naturelle: analyse des bibliothèques d'Alvar Aalto. (Prix IBE-BIV 2013, Institut Belge de l'éclairage, affilié à la CIE)

2014

Simulating Daylight Propagation through Complex Fenestration Systems in a Urban Context Using Variable Sampling Subdivision Scheme

Jean-Louis Scartezzini

EPFL Solar Energy and Building Physics Laboratory (LESO-PB)2013