📄 lpfilter.m
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function [H, D] = lpfilter(type,M,N,D0,n)
[U, V] = dftuv(M, N);
D = sqrt(U.^2 + V.^2);
switch type
case 'ideal'
H = double(D <= D0);
case 'btw'
if nargin == 4
n = 1;
end
H = 1./(1+(D./D0).^(2*n));
case 'gaussian'
H = exp(-(D.^2)./(2*(D0^2)));
otherwise
error('Unknow Filter Type.')
end
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