Re: 3D Fourier Transform

Posted by Herbie on Jul 23, 2015; 3:40pm
URL: http://imagej.273.s1.nabble.com/3D-Fourier-Transform-tp5013721p5013724.html

Well Andrea,

what you actually get is a "2D FT of every slice" because ImageJ comes
with 2D-FFT only, but there is the ImageJ PlugIn "FFTJ" that performs 3D
FFTs.

Why not have a look at the ImageJ PlugIn page?

Here you are:
<http://rsb.info.nih.gov/ij/plugins/fftj.html>
and don' forget to read
<http://rsb.info.nih.gov/ij/plugins/fftj2.html>

Be aware that you use a power of two sized dimensions of your stack,
otherwise the DFT applies and that will take longer to compute!

HTH

Herbie

::::::::::::::::::::::::::::::::::::::::::::
Am 23.07.15 um 16:32 schrieb Andrea Chicano:

> Hi, guys!
>
> I have a stack from a tomographic reconstruction that shows a big structure
> made of thin tubes/lines. These lines are present in all the structure, so
> I am wondering if it is possible to obtain a 3D Fourier Transform of the
> volume to see if there is some distance repetition.
>
> I have been making some tests, but what I have obtained is also a stack. It
> seems to be the 1D FT of each slice...and I was expecting a single image.
> Am I wrong? When you apply FT to a stack you also obtain a stack? If not,
> please help me to find the way!
>
> Thanks in advance!
>
> Andrea
>
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