Autocorrelation of power spectrum
题
Have anyone idea how can I implement autocorrelation of power spectrum of one image? I tried using:
autocorrel = ifft( | fft(power spectrum) | ^ 2 );
but its not working? Do you have any idea why or some other way?
解决方案
Autocorrelation in time domain is done via convolution. Function is convoluted with self mirrored around 0. Thus, autocorrel = linear_2d_convolution( S(x,y), S(-x,-y) )
, where S
denotes power spectrum.
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