Re: FFT in imagej for noise removal

Posted by Gluender-4 on Jul 28, 2010; 3:43pm
URL: http://imagej.273.s1.nabble.com/FFT-in-imagej-for-noise-removal-tp3687460p3687461.html

Donny George,

my experience over decades with students and colleagues is that the
sound use of the Fourier-transformation (FT) isn't as easy as it may
look like and that the FFT and its sound application requires a
profound understanding of the FT and its theorems. There are many
books about the FT but only very few are worth studying.

With respect to your problem:
Optimum noise reduction by spatial frequency filtering actually
requires more knowledge than that of the FT or FFT and it requires
quite some knowledge about your image and the noise.

>hello
>
>for pre processing of my image, i wanted to remove noise from it. i googled
>and
>found that FFT was used in photoshop to do it. and i also saw the result.
>however when i tried the same thing in imagej. i wasnt exactly successful. i
>am
>not very sure if i did the part of removing the noise spikes from the fft in
>the
>right way. and therefore when i apply inverse fft all i get is a dark image.
>
>would someone be kind enough to guide me to use FFT in imagej please. with
>the
>wikis on imagej, i have not yet seen a useful one to serve my purpose
>
>any help would be of great assistance
>
>thankyou
>
>Donny George

Best
--

                   Herbie

          ------------------------
          <http://www.gluender.de>