15 October 2012 A BRDF model for scratches and digs
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Abstract
Scratch-dig is an acknowledged cosmetic specification that is often misused as a specification to limit scattered light. In spite of its shortcomings, the stray light analyst is often called upon to write this specification, or at least approve it. An analytic model that relates a bidirectional reflectance distribution function (BRDF) to a scratch-dig specification is proposed. Applying scalar diffraction theory and some idealizations for the shape, orientation, and number of scratches and digs; the magnitude and functional form of the BRDF is derived. The effective BRDF associated with the scratch dig specification is compared with the magnitude and functional form of the BRDF from surface roughness and contamination.
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Gary L. Peterson, "A BRDF model for scratches and digs", Proc. SPIE 8495, Reflection, Scattering, and Diffraction from Surfaces III, 84950G (15 October 2012); doi: 10.1117/12.930860; https://doi.org/10.1117/12.930860
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