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Reflectance and Texture of Real-World Surfaces

Dana, Kristin J.; Nayar, Shree K.; Ginneken, Bram van; Koenderink, Jan J.

In this work we investigate the visual appearance of real world surfaces and the dependence of appearance on scale viewing direction and illumination direction At fine scale
surface variations
cause local intensity variation or image texture The appearance of this texture depends on both
illumination and viewing direction and can be characterized by the BTF bidirectional texture
function At sufficiently coarse scale
local image texture is not resolvable and local image intensity
is uniform The dependence of this image intensity on illumination and viewing direction is described
by the BRDF bidirectional reflectance distribution function We simultaneously measure the BTF
and BRDF of over different rough surfaces
each observed with over
different combinations of
viewing and illumination direction The resulting BTF database is comprised of over

textures To enable convenient use of the BRDF measurements
we t the measurements to two
recent models and obtain a BRDF parameter database These parameters can be used directly in
image analysis and synthesis of a wide variety of surfaces The BTF
and BRDF parameter
databases have important implications for computer vision and computer graphics and and each is
made publicly available.



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More About This Work

Academic Units
Computer Science
Department of Computer Science, Columbia University
Columbia University Computer Science Technical Reports, CUCS-048-96
Published Here
April 22, 2011