24 July 2000 Radiometric spectral and band rendering of targets using anisotropic BRDFs and measured backgrounds
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Abstract
Achievement of ultra-high fidelity signature modeling of targets requires a significant level of complexity for all of the components required in the rendering process. Specifically, the reflectance of the surface must be described using the bi-directional distribution function (BRDF). In addition, the spatial representation of the background must be high fidelity. A methodology and corresponding model for spectral and band rendering of targets using both isotropic and anisotropic BRDFs is presented. In addition, a set of tools will be described for generating theoretical anisotropic BRDFs and for reducing data required for a description of an anisotropic BRDF by 5 orders of magnitude. This methodology is hybrid using a spectrally measured panoramic of the background mapped to a large hemisphere. Both radiosity and ray-tracing approaches are incorporated simultaneously for a robust solution. In the thermal domain the spectral emission is also included in the solution. Rendering examples using several BRDFs will be presented.
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John W. Hilgers, John W. Hilgers, Jeffrey A. Hoffman, Jeffrey A. Hoffman, William R. Reynolds, William R. Reynolds, James C. Jafolla, James C. Jafolla, } "Radiometric spectral and band rendering of targets using anisotropic BRDFs and measured backgrounds", Proc. SPIE 4029, Targets and Backgrounds VI: Characterization, Visualization, and the Detection Process, (24 July 2000); doi: 10.1117/12.392530; https://doi.org/10.1117/12.392530
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