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 Theory of Plenoptic Multiplexing
In: Proceedings of CVPR 2010 (oral).
Abstract
Multiplexing is a common technique for encoding highdimensional image data into a single, two-dimensional image. Examples of spatial multiplexing include Bayer patterns to capture color channels, and integral images to encode light fields. In the Fourier domain, optical heterodyning has been used to acquire light fields.
In this paper, we develop a general theory of multiplexing the dimensions of the plenoptic function onto an image sensor. Our theory enables a principled comparison
of plenoptic multiplexing schemes, including noise analysis,
as well as the development of a generic reconstruction algorithm. The framework also aides in the identification and
optimization of novel multiplexed imaging applications.
Project Page Bibtex
@article{ihrke2010theory,
title={{A theory of plenoptic multiplexing}},
author={Ihrke, I. and Wetzstein, G. and Heidrich, W.},
year={2010},
publisher={IEEE}
}
title={{A theory of plenoptic multiplexing}},
author={Ihrke, I. and Wetzstein, G. and Heidrich, W.},
year={2010},
publisher={IEEE}
}