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UCSC CMPS 290b, Fall 2005 Presented by Steven Scher sscher@ucsc

CURET: A Database of Reflectances and Textures of 60 Real-World Surfaces Dana, Ginneken, Nayar, Koenderink. UCSC CMPS 290b, Fall 2005 Presented by Steven Scher sscher@ucsc.edu. BRDF: Reflectance with 4 angles. Surface Normal. Reflected Light (2 angles). Incident Light (2 angles).

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UCSC CMPS 290b, Fall 2005 Presented by Steven Scher sscher@ucsc

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  1. CURET: A Database ofReflectances and Textures of60 Real-World SurfacesDana, Ginneken, Nayar, Koenderink UCSC CMPS 290b, Fall 2005 Presented by Steven Scher sscher@ucsc.edu

  2. BRDF: Reflectance with 4 angles Surface Normal Reflected Light (2 angles) Incident Light (2 angles) Object Steven Scher, sscher@ucsc.edu

  3. BTF: Reflected Image (2D) with 4 angles Surface Normal Reflected Image (2 angles) Incident Light (2 angles) 2-D image Steven Scher, sscher@ucsc.edu

  4. Image Collection Details Each Vertex is a surface orientation Fixed Light Robotic Hand Camera Moved a few times Steven Scher, sscher@ucsc.edu

  5. Database of Measured BRDF & BTF • BRDF • Bidirectional Reflectance Distribution Function • What happens when an object is seen from a certain angle, lit from a certain angle? • 4-dimensional (brightness for every viewing angle & lighting angle) • BTF • Bidirectional Texture Function • Extension of BRDF for 2.5-dimensional surfaces • Some materials can’t be modeled well as a pattern painted onto an object, but don’t require a full 3D description of every pixel • 6-dimensional (a 2-D picture for every viewing angle & lighting angle) Steven Scher, sscher@ucsc.edu

  6. Useful for Graphics • Graphics • Better Rendering of 2.5-dimensional surfaces • E.g. (http://citeseer.ist.psu.edu/liu01synthesizing.html) • Model for Further databases • e.g. Skin types (http://www.caip.rutgers.edu/rutgers_texture/cvg/doc.html) BRDF BTF BRDF BTF Photos from http://www1.cs.columbia.edu/CAVE/curet/ Steven Scher, sscher@ucsc.edu

  7. Possibilities for Vision • Test for models that parametize texture better than lambertian surface model • Skin-Specific model for facial recognition? • Improved Shape-From-Shading, somehow? Steven Scher, sscher@ucsc.edu

  8. Links • Project Website • http://www1.cs.columbia.edu/CAVE/curet/ • Dana’s Research Page • http://www.caip.rutgers.edu/~kdana/?pid=research • Ginneken’s Papers • http://www.isi.uu.nl/Research/Publications/paperlist.php?author=bram&max_per_page=200 Steven Scher, sscher@ucsc.edu

  9. Faces Bram Van Ginneken Kristin Dana Jan J. Koenderink Shree K. Nayar Steven Scher, sscher@ucsc.edu

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