Link Functions and Matérn Kernel in the Estimation of Reflectance Spectra from RGB Responses.
Journal of the Optical Society of America. A, Optics, image science, and vision（2013）SCI 3区
Univ Eastern Finland | Univ Helsinki
Abstract
We evaluate three link functions (square root, logit, and copula) and Matern kernel in the kernel-based estimation of reflectance spectra of the Munsell Matte collection in the 400-700 nm region. We estimate reflectance spectra from RGB camera responses in case of real and simulated responses and show that a combination of link function and a kernel regression model with a Matern kernel decreases spectral errors when compared to a Gaussian mixture model or kernel regression with the Gaussian kernel. Matern kernel produces performance similar to the thin plate spline model, but does not require a parametric polynomial part in the model. (C) 2013 Optical Society of America
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