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.


Advanced Display Technology

Lecture in winter term 2013/14

Lecturers: Ivo Ihrke, Pascal Picart

General Information

Course webpage - Libres Savoirs

When: 2014, Jan. 08th to 2014, Feb. 5th
Where: IOA/IOGS buiding room E200
Registration for mailing list: send email to Ivo Ihrke (firstname[dot]lastname[at]


In the first part, this lecture covers advanced display technology such as projector arrays, projection onto non-planar surfaces, field-of-view extension, depth-of-field extension, dynamic range extension, and 3D display technology, focussing on glasses-free techniques. In the second part, we will discuss holographic techniques, recording principles, noise issues (speckle), and computational aspects for Computer Generated Holography.

The tentative course schedule is

Wednesday 08.01.2014, 8am Introduction and Field of View Extensions / Projector Arrays / Depth-of-Field (II) [pdf]
Wednesday 15.01.2014, 8am High Dynamic Range, Light-Sensitive Displays, 3D Display Overview (II) [pdf]
Wednesday 22.01.2014, 8am 3D Display Technology (II) [pdf]
Monday 03.02.2014, 8am Introduction Holography (PP) [pdf]
Monday 03.02.2014, 10am Speckles (PP) [pdf]
Tuesday 04.02.2014, 10am Diffraction and its Numerical Computation (PP) [pdf]
Tuesday 04.02.2014, 10am Computer Generated Holography (PP) [pdf]

Q: Could you provide the bibliography on the holographic part of the course ?
A: Yes: [pdf]

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