Generalized Image Acquisition and Analysis
Dynamic Display of BRDFs
This paper deals with the challenge of physically displaying reflectance, i.e., the appearance of a surface and its variation with the observer position and the illuminating environment. This is commonly described by the bidirectional reflectance distribution function (BRDF). We provide a catalogue of criteria for the display of BRDFs, and sketch a few orthogonal approaches to solving the problem in an optically passive way. Our specific implementation is based on a liquid surface, on which we excite waves in order to achieve a varying degree of anisotropic roughness. The resulting probability density function of the surface normal is shown to follow a Gaussian distribution similar to most established BRDF models.
Projects
A Reconfigurable Camera Add-On for High Dynamic Range, Multispectral, Polarization, and Light-Field Imaging
SIGGRAPH 2013
Abstract
We propose a non-permanent add-on that enables plenoptic
imaging with standard cameras which we refer to as
KaleidoCamera. Our design is based on a physical copying
mechanism that multiplies a sensor image into a number of
identical copies that still carry the plenoptic information
of interest. Via different optical filters, we can then
recover the desired information. A minor modification of the
design also allows for aperture subsampling and, hence,
light-field imaging. As the filters in our design are
exchangeable, a reconfiguration for different imaging
purposes is possible. We show in a prototype setup that high
dynamic range, multispectral, polarization, and light-field
imaging can be achieved with our design.
Project Page Video Data Set Bibtex
@article{Manakov:13,
author = {Alkhazur Manakov and John Restrepo and Oliver Klehm and Ramon Hegeds and Elmar Eisemann and Hans-Peter Seidel and Ivo Ihrke},
title = {A Reconfigurable Camera Add-On for High Dynamic Range, Multispectral, Polarization, and Light-Field Imaging},
journal = {ACM Trans. on Graphics (SIGGRAPH'13)},
volume = 32, number = 4, year = 2013,
pages = {xx--yy},
}
author = {Alkhazur Manakov and John Restrepo and Oliver Klehm and Ramon Hegeds and Elmar Eisemann and Hans-Peter Seidel and Ivo Ihrke},
title = {A Reconfigurable Camera Add-On for High Dynamic Range, Multispectral, Polarization, and Light-Field Imaging},
journal = {ACM Trans. on Graphics (SIGGRAPH'13)},
volume = 32, number = 4, year = 2013,
pages = {xx--yy},
}