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function mtf = WilliamsRestMTF(s)
%WILLIAMSRESTMTF Utility function for WILLIAMSMTF
% mtf = WILLIAMSRESTMTF(s)
%
% Compute the portion of the MTF measured by Williams et. al. that is not
% accounted for by diffraction.
%
% Williams, D.R. Brainard, D.H., McMahon, M., and Navarro, R. (1994).
% Double pass and interferometric measures of the optical quality of the
% human eye. Journal of the Optical Society of America A, 11, 3123-3135.
% Formulae given in Equation 1 ff.
%
% Spatial frequency passed in cycles/deg.
%
% See also WILLIAMSMTF
% 7/14/94 dhb Wrote it.
a = 0.1212;
w1 = 0.3481;
w2 = 0.6519;
mtf = w1*ones(size(s)) + w2*exp(-a*s);
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