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 ev...

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Bibliographic Details
Published in:Experiments in fluids 2009-03, Vol.46 (3), p.467-476
Main Authors: Atcheson, Bradley, Heidrich, Wolfgang, Ihrke, Ivo
Format: Article
Language:English
Subjects:
Algorithms
Displacement
Engineering
Engineering Fluid Dynamics
Engineering Thermodynamics
Exact sciences and technology
Fluid dynamics
Fluid flow
Fluid- and Aerodynamics
Fundamental areas of phenomenology (including applications)
Heat and Mass Transfer
Impact analysis
Instrumentation for fluid dynamics
Mathematical analysis
Particle image velocimetry
Physics
Research Article
Vectors (mathematics)
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Summary: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.
ISSN:0723-4864
1432-1114
DOI:10.1007/s00348-008-0572-7