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Mesostructure from Specularity Using Coded Illumination

Mesostructure from Specularity Using Coded Illumination Yannick Francken, Tom Mertens, Jo Gielis , Philippe Bekaert Expertise Centre for Digital Media Hasselt University ( Belgium ) { yannick.francken , tom.mertens , philippe.bekaert }@ uhasselt.be jo.gielis @ student.uhasselt.be.

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Mesostructure from Specularity Using Coded Illumination

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  1. MesostructurefromSpecularityUsingCodedIllumination Yannick Francken, Tom Mertens, Jo Gielis, Philippe Bekaert Expertise Centre for Digital Media Hasselt University (Belgium) {yannick.francken, tom.mertens, philippe.bekaert}@uhasselt.be jo.gielis@student.uhasselt.be

  2. Goal Acquire mesostructure’s normal map Mesostructure Normal map

  3. Previous Work Shape from shading [Horn75, Zhang99]

  4. Previous Work … Shape from shading [Horn75, Zhang99] Photometric stereo [Woodham89, Ikeuchi92]

  5. Previous Work Shape from shading [Horn75, Zhang99] Photometric stereo [Woodham89, Ikeuchi92] Structured light [Boyer87, Scharstein03]

  6. Previous Work … • Shape from shading [Horn75, Zhang99] • Photometric stereo [Woodham80, Ikeuchi92] • Structured light [Boyer87, Scharstein03] • Mesostructure scanning • Mesostructure from Specularity[Chen06]

  7. Previous Work • Shape from shading [Horn75, Zhang99] • Photometric stereo [Woodham80, Ikeuchi92] • Structured light [Boyer87, Scharstein03] • Mesostructure scanning • Mesostructure from Specularity[Chen06] • Rapid Acquisition of Specular and Diffuse Normal Maps from Polarized Spherical Gradient Illumination [Ma07]

  8. Previous Work Mesostructure from specularity[Chen06] Setup Image captures

  9. Previous Work Mesostructure from specularity[Chen06] Law of reflection Detecting specularities V = 2(NTL)N - L L V N

  10. Observation A specularity is caused by onelight source 1011 1100 10 100 1001 1 1101 1010 1001 1110 1000 1111 O(log N) instead of O(N) image captures!

  11. Setup M x N light sources log2M + log2N + 1 patterns • Screen-camera setup • Screen as cheap controllable light source [Zongker96, Tarini05, Clark05, Funk06] • Calibration [Hartley04, Tarini05, Francken06, Funk06] • Binary coded light patterns • Gray code

  12. Results

  13. Limits   Only specularmesostructures Sharp specular highlights

  14. Limits • Only specularmesostructures • Sharp specular highlights • Limited cone of normals • Planar display

  15. Limits • Only specularmesostructures • Sharp specular highlights • Limited cone of normals • Planar display • Self shadowing

  16. Conclusion • Efficient • O(log N) instead of O(N) • Longer exposure times  less noise • Inexpensive setup • Only controllable binary light source

  17. Future Work Smoothness constraints Using specularand diffuse components Surface adaptive patterns Colored patterns instead of binary Hemispherical light source

  18. Questions? yannick.francken@uhasselt.be http://research.edm.uhasselt.be/~yfrancken • Summary • Efficient • O(log N) instead of O(N) • Longer exposure times less noise • Inexpensive setup • Only controllable binarylight source

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