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.
MATLAB Color Calibration ToolboxThe toolbox can be used to compute color compensation matrices from images of a color checker (Gretag-Macbeth 24 patches, Colorchecker DC 240 patches, or ColorcheckerSG 140 patches). Since version 2.0 the software can also estimate radiometric camera response curves from an exposure stack of a color checker.
Author: Ivo Ihrke
PFS CalibrationIvo Ihrke is currently the maintainer of the PFS calibration package.
Demo and Datasets for "Interactive Geometry-Aware Segmentation for the Decomposition of Kaleidoscopic Images"
Code and Datasets for "A Theory of Plenoptic Multiplexing"
Implementation for "Eikonal Rendering"
Multi-View Data SetsA multi-view data set of fire from our SCA 2004 paper and a synthetic multi-view data set (kungfu-girl)
Focal Stack PhotographyFocal Stack Photography has been a project of the lecture "Computational Photography 2010".
There are some data sets available on the project page containing up to 500 shots.
Some of the data sets are also available in 20 mega pixel resolution and raw format.
Feel free to ask for it.