?? corrfft.m
字號:
function [corr] = corrfft(f, g)
sze = size(f);
sze = sze(1);
% compute fft of f and g zero padded out to 2*sze x 2*sze
f = flipud(fliplr(f));
ffft = fft2(f, sze*2, sze*2);
gfft = fft2(g, sze*2, sze*2);
yout = ifft2(ffft.*gfft);
startpt = sze/2 + 1;
endpt = sze*2 - sze/2;
h = yout(startpt,:);
for i = (startpt+1):endpt
h = [h; yout(i,:)];
end
yout = h(:,startpt);
for i = (startpt+1):endpt
yout = [yout h(:,i)];
end
y = yout;
corr = max(max(y));
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