?? hp_filter.m.svn-base
字號:
function [out] = hp_filter(in)
% Get image size
[Y,X] = size(in);
% Build filter
[Xm,Ym] = meshgrid(1:X,1:Y);
Xm = (Xm - X/2) / X;
Ym = (Ym - Y/2) / Y;
filt = cos(pi * Xm) .* cos(pi * Ym);
filt = (1 - filt) .* (2 - filt);
% Apply filter
out = in .* filt;
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