Experimentally validated modification to Cook-Torrance BRDF model for improved accuracy

Samuel D. Butler; James A. Ethridge; Stephen E. Nauyoks; Michael A. Marciniak

doi:10.1117/12.2274145

5 September 2017 Experimentally validated modification to Cook-Torrance BRDF model for improved accuracy

Samuel D. Butler, James A. Ethridge, Stephen E. Nauyoks, Michael A. Marciniak

Proceedings Volume 10402, Earth Observing Systems XXII; 1040214 (2017) https://doi.org/10.1117/12.2274145
Event: SPIE Optical Engineering + Applications, 2017, San Diego, California, United States

Abstract

The BRDF describes optical scatter off realistic surfaces. The microfacet BRDF model assumes geometric optics but is computationally simple compared to wave optics models. In this work, MERL BRDF data is fitted to the original Cook-Torrance microfacet model, and a modified Cook-Torrance model using the polarization factor in place of the mathematically problematic cross section conversion and geometric attenuation terms. The results provide experimental evidence that this modified Cook-Torrance model leads to improved fits, particularly for large incident and scattered angles. These results are expected to lead to more accurate BRDF modeling for remote sensing.

Citation Download Citation

Samuel D. Butler, James A. Ethridge, Stephen E. Nauyoks, and Michael A. Marciniak "Experimentally validated modification to Cook-Torrance BRDF model for improved accuracy", Proc. SPIE 10402, Earth Observing Systems XXII, 1040214 (5 September 2017); https://doi.org/10.1117/12.2274145

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