Generalized Image Acquisition and Analysis
An evaluation of optical flow algorithms for background oriented schlieren imaging
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.
Projects
Volume Stylizer: Tomography-based Volume Painting
I3D 2013
Abstract
Volumetric phenomena are an integral part of standard
rendering, yet, no suitable tools to edit characteristic
properties are available so far. Either simulation results
are used directly, or modifications are high-level, e.g.,
noise functions to influence appearance. Intuitive artistic
control is not possible.
We propose a solution to stylize single-scattering
volumetric effects. Emission, scattering and extinction
become amenable to artistic control while preserving a
smooth and coherent appearance when changing the
viewpoint. Our approach lets the user define a number of
target views to be matched when observing the volume from
this perspective. Via an analysis of the volumetric
rendering equation, we can show how to link this problem to
tomographic reconstruction.
Video Slides Bibtex
@inproceedings{Klehm:13,
author = {Oliver Klehm and Ivo Ihrke and Hans-Peter Seidel and Elmar Eisemann},
title = {Volume Stylizer: Tomography-based Volume Painting},
booktitle = {Symposium on Interactive 3D Graphics and Games (i3D'13)},
year = 2013,
pages = {xx--yy},
}
author = {Oliver Klehm and Ivo Ihrke and Hans-Peter Seidel and Elmar Eisemann},
title = {Volume Stylizer: Tomography-based Volume Painting},
booktitle = {Symposium on Interactive 3D Graphics and Games (i3D'13)},
year = 2013,
pages = {xx--yy},
}