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Fast Separation of Direct and Global Images Using High Frequency Illumination

Fast Separation of Direct and Global Images Using High Frequency Illumination. Michael D. Grossberg City College of New York. Shree K. Nayar Gurunandan G. Krishnan Columbia University. Ramesh Raskar MERL. SIGGRAPH Conference Boston, July 2006 Support: ONR, NSF, MERL. participating

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Fast Separation of Direct and Global Images Using High Frequency Illumination

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  1. Fast Separation of Direct and Global Images Using High Frequency Illumination Michael D. Grossberg City College of New York Shree K. Nayar Gurunandan G. Krishnan Columbia University Ramesh Raskar MERL SIGGRAPH Conference Boston, July 2006 Support: ONR, NSF, MERL

  2. participating medium B D A C A : Direct B : Interrelection E C : Subsurface translucent surface D : Volumetric E : Diffusion Direct and Global Illumination surface source P camera

  3. Inverse Light Transport (Seitz et. al., ICCV 05) • Dual Photography (Sen et. al., Siggraph 05) T Related Work

  4. Fast Separation of Direct and Global Images • Create Novel Images of the Scene • Enhance Brightness Based Vision Methods • New Insights into Material Properties

  5. j global BRDF and geometry radiance direct Direct and Global Components: Interreflections surface source i camera

  6. i + fraction of activated source elements High Frequency Illumination Pattern surface source camera

  7. i - + High Frequency Illumination Pattern surface source camera fraction of activated source elements

  8. Separation from Two Images direct global

  9. j i Other Global Effects: Subsurface Scattering translucent surface source camera

  10. j i Other Global Effects: Volumetric Scattering participating medium surface source camera

  11. Diffuse Interreflections Specular Interreflections Diffusion Volumetric Scattering Subsurface Scattering

  12. Scene

  13. Direct Global Scene

  14. Real World Examples: Can You Guess the Images?

  15. Direct Global Eggs: Diffuse Interreflections

  16. Direct Global Wooden Blocks: Specular Interreflections

  17. Novel Images

  18. Direct Global Mirror Ball: Failure Case

  19. Source 3 Source 2 Source 1 Global Direct Photometric Stereo using Direct Images Bowl Shape Nayar et al., 1991

  20. Direct Global Kitchen Sink: Volumetric Scattering Volumetric Scattering: Chandrasekar 50, Ishimaru 78

  21. Novel Image

  22. Direct Global Peppers: Subsurface Scattering

  23. Novel Images

  24. Direct Global Hand Skin: Hanrahan and Krueger 93, Uchida 96, Haro 01, Jensen et al. 01, Cula and Dana 02, Igarashi et al. 05, Weyrich et al. 05

  25. Direct Global Direct Global Face: Without and With Makeup Without Makeup With Makeup

  26. Direct Global Blonde Hair Hair Scattering: Stamm et al. 77, Bustard and Smith 91, Lu et al. 00 Marschner et al. 03

  27. Coded Structured Light • Shifted Sinusoids • Shadow of Line Occluder • Shadow of Mesh Occluders Variants of Separation Method

  28. Implications: • Generation of Novel Images • Enhance Computer Vision Methods • Insights into Properties of Materials Summary • Fast and Simple Separation Method • No Prior Knowledge of Material Properties • Wide Variety of Global Effects

  29. www.cs.columbia.edu/CAVE

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