frequency spectrum

Posted by julio buonfigli on Dec 04, 2018; 2:09pm
URL: http://imagej.273.s1.nabble.com/frequency-spectrum-tp5021526.html

Hello everyone, I am looking for a function like a FFT (forward fourier transform) but not exatly. I need a frequency spectrum like the one I would get from a sound signal, namely, the intensity of every frequency but no information about the phase. I want to compare two images, for example two cells, to know if both cells have the same features relative to the size of vesicles (I expect this would be a specific frequency) and general organization (other frequencies). With FFT I can not compare because on the transformed image the frequency peaks appear on different sites according the spatial distribution of the spatial domain image. Any tip?      

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