Tomographic reconstruction and efficient rendering of refractive gas flows

Ivo Ihrke*, Kai Berger, Bradley Atcheson, Marcus Magnor, Wolfgang Heidrich

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingChapterpeer-review

3 Scopus citations


This chapter introduces techniques for the capture and efficient display of dynamic three-dimensional non-stationary gas flows. We describe a flexible Schlieren-tomographic system consisting of multiple consumer camcorders. A special choice of background pattern for Background Oriented Schlieren (BOS) imaging provides for flexibility in the experimental setup. Optical flow techniques are used to measure image space deflections due to heated air flows from arbitrary camera positions. A specially tailored sparse-view algebraic reconstruction algorithm is employed to tomographically recover a refractive index gradient field. After robust integration of these gradient fields, time-varying, fully three-dimensional refractive index fields are obtained. These can be rendered efficiently using a ray-casting style algorithm that is suitable for graphics hardware acceleration. Additional optical properties can be rendered within the same computational framework.

Original languageEnglish (US)
Title of host publicationImaging Measurement Methods for Flow Analysis
Subtitle of host publicationResults of the DFG Priority Programme 1147 "Imaging Measurement Methods for Flow Analysis" 2003-2009
EditorsWolfgang Nitsche, Christoph Dobriloff
Number of pages10
StatePublished - 2009
Externally publishedYes

Publication series

NameNotes on Numerical Fluid Mechanics and Multidisciplinary Design
ISSN (Print)1612-2909

ASJC Scopus subject areas

  • Fluid Flow and Transfer Processes


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