An evaluation of optical flow algorithms for background oriented schlieren imaging

Bradley Atcheson, Wolfgang Heidrich, Ivo Ihrke

The University of British Columbia

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The original publication is available at www.springerlink.com/content/g1vu1240n1326775
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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}
}

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.