Generalized Image Acquisition and Analysis

Acquisition and Analysis of Bispectral Bidirectional Reflectance and Reradiation Distribution Functions

In fluorescent materials, light from a certain band of incident wavelengths is reradiated at longer wavelengths, i.e., with a reduced per-photon energy. While fluorescent materials are common in everyday life, they have received little attention in computer graphics. Especially, no bidirectional reradiation measurements of fluorescent materials have been available so far. In this paper, we extend the well-known concept of the bidirectional reflectance distribution function (BRDF) to account for energy transfer between wavelengths, resulting in a Bispectral Bidirectional Reflectance and Reradiation Distribution Function (bispectral BRRDF). Using a bidirectional and bispectral measurement setup, we acquire reflectance and reradiation data of a variety of fluorescent materials, including vehicle paints, paper and fabric, and compare their renderings with RGB, RGB×RGB, and spectral BRDFs. Our acquisition is guided by a principal component analysis on complete bispectral data taken under a sparse set of angles. We show that in order to faithfully reproduce the full bispectral information for all other angles, only a very small number of wavelength pairs needs to be measured at a high angular resolution.

News

2014-07-01

Software Update

The MATLAB Color Calibration Toolbox v2.1 (minor update) has been updated. No new functionalities this time; added error tolerance against missing packages.

2014-05-01

Eurographics 2014 Introduction to Optimization Techniques in Computer Graphics

Slides are online here.

2014-05-01

GIAnA associated with the Laboratoire Photonique, Numerique et Nanosciences (LP2N)

We will create a computational optics group at the LP2N.

2013-03-01

GIAnA joined INRIA

Generalized Image Acquisition and Analysis moved to Bordeaux to join the manao team.

2012-08-01

Emmy-Noether Group

Generalized Image Acquisition and Analysis is now supported by an Emmy-Noether grant.

2012-07-19

Software Update

The MATLAB Color Calibration Toolbox has been updated and is now supporting radiometric response curve estimation.

2011-09-28

In the press

Johannes Kepler University Linz is reporting about our E-Lecture on Computational Photography last summer term. It was the first remote-only lecture for JKU. Eleven students attended the course at JKU.

2011-07-27

In the press

Our work on dynamically displaying BRDFs is going to be featured in the September issue of 3D World, a magazine for 3D artists, covering SIGGRAPH's Emerging Technologies where we will demo our work. Matthias Hullin is quoted as "I don't expect a BRDF display to become available in the next 20 years. The principle on which the Nintendo 3DS is based was patented back in 1913!" -->

2011-04-27

Webpage updated

Projects have been imported from previous webpage.
Several changes of the webpage regarding look and usage.