Computer Graphics
TU Braunschweig

Tomographic Reconstruction and Efficient Rendering of Refractive Gas Flows

Tomographic Reconstruction and Efficient Rendering of Refractive Gas Flows

This chapter introduces techniques for the capture and efficient dis-

play of dynamic three-dimensional non-stationary gas flows. We describe a flexible Schlieren-tomographic system consisting of multiple cons

umer camcorders. A special choice of background pattern for Background Oriented Schlieren (BOS) imaging provides for flexibility in the experimental setup. Optical flow techniques areused 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.

Author(s):Ivo Ihrke, Kai Berger, Bradly Atcheson, Marcus Magnor, Wolfgang Heidrich
Published:February 2009
Type:Book chapter
Book:Imaging Measurement Methods for Flow Analysis (Springer Berlin / Heidelberg)
Project(s): Physics-based Rendering 

  title = {Tomographic Reconstruction and Efficient Rendering of Refractive Gas Flows},
  author = {Ihrke, Ivo and Berger, Kai and Atcheson, Bradly and Magnor, Marcus and Heidrich, Wolfgang},
  booktitle = {Imaging Measurement Methods for Flow Analysis},
  isbn = {978-3-642-01106-1},
  publisher = {Springer Berlin / Heidelberg},
  editor = {Nitsche, Wolfgang and Dobriloff, Christoph},
  volume = {106},
  pages = {145--154},
  month = {Feb},
  year = {2009}