Capturing Bispectral Reflectance and Reradiation

Who and when?
Dr.-Ing. Hendrik Lensch, Professor for computer graphics at Tübingen University, is going to visit our University on Monday, January 12th. His talk will start at 4:00 pm in the Visual Computing Lab C 061.

Topic: Capturing Bispectral Reflectance and Reradiation
In fluorescent materials, light from a certain band of incident wavelengths is reradiated at longer wavelengths, i.e., with a reduced per-photon energy. In this talk, we will 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).
Two different measurement setups will be presented. One is for capturing bidirectional and bispectral reflectance and reradiation data of homogenous fluorescent materials. The other one is a hyperspectral light stage which allows for capturing spatially varying material properties of arbitrary 3D objects. In order to reduce the number of measurement images we make use of principal component analysis as well as compressive sensing, reconstructing the full BRRDF. Finally, a simple reflectance display will be presented.

Hendrik P. A. Lensch holds the chair for computer graphics at Tübingen University and is currently the head of the computer science department. He received his diploma in computers science from the University of Erlangen in 1999. He worked as a research associate at the computer graphics group at the Max-Planck-Institut für Informatik in Saarbrücken, Germany, and received his PhD from Saarland University in 2003. Hendrik Lensch spent two years (2004-2006) as a visiting assistant professor at Stanford University, USA, followed by a stay at the MPI Informatik as the head of an independent research group. From 2009 to 2011 he has been a full professor at the Institute for Media Informatics at Ulm University, Germany. In his career, he received the Eurographics Young Researcher Award 2005, was awarded an Emmy-Noether-Fellowship by the German Research Foundation (DFG) in 2007 and received an NVIDIA Professor Partnership Award in 2010. His research interests include 3D appearance acquisition, computational photography, global illumination and image-based rendering, and massively parallel programming.

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