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ACM SIGGRAPH Asia 2016 (Transactions on Graphics)

 
Birefractive Stereo Imaging for Single-Shot Depth Acquisition
 
  Seung-Hwan Baek Diego Gutierrez* Min H. Kim  
  KAIST   *Universidad de Zaragoza, I3A  
         
 
  We present birefractive stereo for single-shot depth imaging by simply placing a birefringent crystal in front of a camera (a). Birefringent materials produce a double-refraction phenomenon (b). We rely on this effect to enable single-shot depth imaging, by simply placing a birefringent crystal in front of a camera and capturing a double refraction image (c). We develop a novel birefringent imaging model to leverage the disparity information encoded in this image, obtaining depth (d).  
     
   
  Abstract
   
  We propose a novel birefractive depth acquisition method, which allows for single-shot depth imaging by just placing a birefringent material in front of the lens. While most transmissive materials present a single refractive index per wavelength, birefringent crystals like calcite posses two, resulting in a double refraction effect. We develop an imaging model that leverages this phenomenon and the information contained in the ordinary and the extraordinary refracted rays, providing an effective formulation of the geometric relationship between scene depth and double refraction. To handle the inherent ambiguity of having two sources of information overlapped in a single image, we define and combine two different cost volume functions. We additionally present a novel calibration technique for birefringence, carefully analyze and validate our model, and demonstrate the usefulness of our approach with several image-editing applications.
   
  BibTeX
 
  @Article{BaekGutierrezKim:SIGA:2016,
  author  = {Seung-Hwan Baek and Diego Gutierrez and Min H. Kim},
  title   = {Birefractive Stereo Imaging for Single-Shot Depth Acquisition},
  journal = {ACM Transactions on Graphics (Proc. SIGGRAPH Asia 2016)},
  year    = {2016},
  volume  = {35},
  number  = {6},
  pages   = {194:1--194:11},
  doi     = "10.1145/2980179.2980221",
  url     = "http://dx.doi.org/10.1145/2980179.2980221",
  }         
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Preprint paper:
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Supplemental #1:
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Supplemental #2:
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SIGGRAPH Asia 2016 slides
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