1. 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

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

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

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

5. Steven Scher, sscher@ucsc.edu Database of Measured BRDF & BTF BRDF 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 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 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)

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

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

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

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