Computational Schlieren Photography with Light Field Probes
Author(s)
Wetzstein, Gordon; Heidrich, Wolfgang; Raskar, Ramesh
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We introduce a new approach to capturing refraction in transparent media, which we call light field background oriented Schlieren photography. By optically coding the locations and directions of light rays emerging from a light field probe, we can capture changes of the refractive index field between the probe and a camera or an observer. Our prototype capture setup consists of inexpensive off-the-shelf hardware, including inkjet-printed transparencies, lenslet arrays, and a conventional camera. By carefully encoding the color and intensity variations of 4D light field probes, we show how to code both spatial and angular information of refractive phenomena. Such coding schemes are demonstrated to allow for a new, single image approach to reconstructing transparent surfaces, such as thin solids or surfaces of fluids. The captured visual information is used to reconstruct refractive surface normals and a sparse set of control points independently from a single photograph.
Date issued
2013-08Department
Massachusetts Institute of Technology. Media Laboratory; Program in Media Arts and Sciences (Massachusetts Institute of Technology)Journal
International Journal of Computer Vision
Publisher
Springer US
Citation
Wetzstein, Gordon, Wolfgang Heidrich, and Ramesh Raskar. “Computational Schlieren Photography with Light Field Probes.” International Journal of Computer Vision 110, no. 2 (August 20, 2013): 113–127.
Version: Author's final manuscript
ISSN
0920-5691
1573-1405