Modelling and analysis of ship surface BRDF

David A. Vaitekunas

doi:10.1117/12.724662

4 May 2007 Modelling and analysis of ship surface BRDF

David A. Vaitekunas

Proceedings Volume 6543, Infrared Imaging Systems: Design, Analysis, Modeling, and Testing XVIII; 654303 (2007) https://doi.org/10.1117/12.724662
Event: Defense and Security Symposium, 2007, Orlando, Florida, United States

Abstract

Modelling the bi-directional reflectance distribution function (BRDF) of a ship surface is an integral part of any infrared ship signature model. The ShipIR surface BRDF model is based on Sandford and Robertson (1985) and makes a discrete assumption for lobe-width and solar-glint. The ShipIR sea surface reflectance model uses a roughness model based on the early work of Cox and Munk (1954) and refined using the integral solution proposed by Mermelstein et al. (1994). A similar approach was used by Ward (1992) to model the visual properties of a real surface, considering isotropic and anisotropic surface roughness. This paper compares the two roughness models and shows how a slope probability density function (PDF) version of the bi-directional reflectance is better suited for modelling micro-faceted surface reflections. The simulation of an actual ship IR glint measurement demonstrates the effect of BRDF lobes in the paint property and provides a qualitative assessment of the ShipIR model.

Citation Download Citation

David A. Vaitekunas "Modelling and analysis of ship surface BRDF", Proc. SPIE 6543, Infrared Imaging Systems: Design, Analysis, Modeling, and Testing XVIII, 654303 (4 May 2007); https://doi.org/10.1117/12.724662

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