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Proceedings Paper

Modification of the Maxwell-Beard bidirectional reflectance distribution function
Author(s): Wendy C. Shemano; William F. Lynn; Dave Shemano; Thomas A. Davis
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Paper Abstract

A modification to the mathematical representation of shadowing and obscuration (SO) in the Maxwell-Beard BRDF model is proposed to better represent actual SO data and subsequently improve the accuracy of model predicted values of BRDF. The SO function is an empirical dual peak mathematical expression originally developed for smooth first surface layer opaque material, such as semi-gloss and gloss paints. Adding variability to forward scattering of the SO function allows a better fit to more sample types. The result is a more accurate prediction of BRDF values for model non-compliant samples such as brick, concrete, asphalt, and paints with high concentrations of extender pigment. Data were collected and analyzed for both model compliant and non-compliant samples. The proposed model changes were implemented through use of an interactive spreadsheet. Results for compliant and non- compliant samples were compared using the original and modified model. Model compliant samples showed little improvement, while non-compliant samples often showed marked improvement.

Paper Details

Date Published: 25 October 1999
PDF: 9 pages
Proc. SPIE 3784, Rough Surface Scattering and Contamination, (25 October 1999); doi: 10.1117/12.366707
Show Author Affiliations
Wendy C. Shemano, Veridian Engineering Inc. (United States)
William F. Lynn, Veridian Engineering Inc. (United States)
Dave Shemano, Wyle Labs. (United States)
Thomas A. Davis, Veridian Engineering Inc. (United States)

Published in SPIE Proceedings Vol. 3784:
Rough Surface Scattering and Contamination
Zu-Han Gu; Philip T. C. Chen; Zu-Han Gu; Alexei A. Maradudin; Alexei A. Maradudin, Editor(s)

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