Doing an autocorrelation
The autocorrelation of the input image, input
,
can be constructed from the command
» out = auto(input);
where auto
is the following Matlab file
function f = auto(a)
%
% AUTO
% f = auto(a)
% returns as f the auto-correlation of image a.
f = fft2(a);
f = f.*conj(f);
f = ifft2(f);
f = fftshift(f);
f = real(f);
f = f/max(max(f));
Maintained by John
Loomis, last updated 8 March 2000