Generalized Image Acquisition and Analysis

State of the Art in Computational Fabrication and Display of Material Appearance.

After decades of research on digital representations of material and object appearance, computer graphics has more recently turned to the problem of creating physical artifacts with controllable appearance characteristics. While this work has mostly progressed in two parallel streams – display technologies as well as novel fabrication processes – we believe there is a large overlap and the potential for synergies between these two approaches. In this report, we summarize research efforts from the worlds of fabrication display, and categorize the different approaches into a common taxonomy. We believe that this report can serve as a basis for systematic exploration of the design space in future research.

Projects

An evaluation of optical flow algorithms for background oriented schlieren imaging

Bradley Atcheson, Wolfgang Heidrich, Ivo Ihrke
In: Experiments in Fluids 2009.



Abstract

The background oriented schlieren method (BOS) allows for accurate flow measurements with a simple experimental configuration. To estimate per-pixel displacement vectors between two images, BOS systems traditionally borrow window-based algorithms from particle image velocimetry. In this paper, we evaluate the performance of more recent optical flow methods in BOS settings. We also analyze the impact of different background patterns, suggesting the use of a pattern with detail at many scales. Experiments with both synthetic and real datasets show that the performance of BOS systems can be significantly improved through a combination of optical flow algorithms and multiscale background.
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Bibtex

@ARTICLE{Atcheson:EiF:2008,
author = {Bradley Atcheson and Wolfgang Heidrich and Ivo Ihrke},
title = {An evaluation of optical flow algorithms for background oriented schlieren imaging},
journal = {Experiments in Fluids},
year = {2008},
volume = {to appear},
number = {},
pages = {},
doi = {10.1007/s00348-008-0572-7}
}
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