Cooper, Victoria L.Bieron, James C.Peers, PieterKlein, Reinhard and Rushmeier, Holly2019-09-162019-09-162019978-3-03868-080-22309-5059https://doi.org/10.2312/mam.20191308https://diglib.eg.org:443/handle/10.2312/mam20191308In this paper we demonstrate robust estimation of the model parameters of a fully-linear data-driven BRDF model from a reflectance map under known natural lighting. To regularize the estimation of the model parameters, we leverage the reflectance similarities within a material class. We approximate the space of homogeneous BRDFs using a Gaussian mixture model, and assign a material class to each Gaussian in the mixture model. Next, we compute a linear solution per material class. Finally, we select the best candidate as the final estimate. We demonstrate the efficacy and robustness of our method using the MERL BRDF database under a variety of natural lighting conditions.!10.2312/mam.2019130823-26