Abstract
We study and analyze properties underlying the visual appearance of
materials such as the surface bidirectional reflection distribution function
and texture. The spatial distribution of scattered light in relation to the
incident light determines the surface appearance and can be partly specified
by the bidirectional reflection distribution function, which is defined as the
directionally dependent ratio of radiance to irradiance. We perform
gonioradiometric measurements on samples of bricks and tiles. To describe the
reflection mechanisms in the surfaces under study, we combine models of
specular and diffuse reflectance from rough surfaces and fit them to the
experimental data. We also collect images and determine the textural
differences in the surface appearance, resulting from the variation in the
illumination direction and the viewing directions.
© 1997 Optical Society of America
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