Reflectance and texture of real-world surfaces

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 variations local intensity variation or image texture The appearance of this texture depends on both and viewing direction and can be characterized by the BTF bidirectional texture At sufficiently coarse scale image texture is not resolvable and local image intensity uniform The dependence of this image intensity on illumination and viewing direction is described the BRDF bidirectional reflectance distribution function We simultaneously measure the BTF BRDF of over different rough surfaces observed with over different combinations of and illumination direction The resulting BTF database is comprised of over image To enable convenient use of the BRDF measurements t the measurements to two models and obtain a BRDF parameter database These parameters can be used directly in analysis and synthesis of a wide variety of surfaces The BTF BRDF parameter have important implications for computer vision and computer graphics and and each is publicly available.