Light Field Photography Introduction

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Light Field Photography Introduction

  1. 1. Light Field Photography Gordon Wetzstein Research Scientist MIT Media Lab . Camera Culture media.mit.edu/~gordonw slides: many talks & computational photography courses from Media Lab, CSAIL (Fredo Durand), Stanford (Marc Levoy)
  2. 2. Conventional Photo – Large ApertureScene from Above
  3. 3. Conventional Photo – Small ApertureScene from Above
  4. 4. Scene from Above Proposed Technology: Mask-Coded Light Field Projection Coded Attenuation Mask
  5. 5. Scene from Above Light Field
  6. 6. Light FieldScene from Above
  7. 7. Scene from Above Applications: Image Refocus
  8. 8. Scene from Above Applications: Depth, Segmentation, Object Recognition, …
  9. 9. Scene from Above Applications: Change Viewpoint & 3D Display e.g., Tensor Displays [Wetzstein et al. 2012]
  10. 10. Camera Arrays e.g., [Wilburn et al. 2002,2005] How is it done today? Sequential Acquisition e.g., [Levoy and Hanrahan 1996], [Liang et al. 2008]
  11. 11. Scene from Above Lenslet Array [Lippman 1908], [Adelson and Wang 1992], [Ng et al. 2005] Integral Imaging # Sensor Pixels X #SensorPixelsY
  12. 12. Scene from Above Integral Imaging
  13. 13. Scene from Above # Sensor Pixels X / # Views X #SensorPixelsY/#ViewsY Example Sensor with 2000 x 1000 pixels 5 x 5 light field views, each with 400 x 200 pixels Integral Imaging: Spatio-Angular Resolution Tradeoff!Spatio-Angular Resolution Tradeoff!
  14. 14. Light Field is Redundant!Scene from Above
  15. 15. Exploit redundancy Compressive Reconstruction Key Insights Light Field Atoms Sparsify Preserve information Mask-based Light Field Coding

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