Re: FFT in imagej for noise removal
Posted by
Andreas Maier on
Jul 28, 2010; 4:12pm
URL: http://imagej.273.s1.nabble.com/FFT-in-imagej-for-noise-removal-tp3687460p3687462.html
Hi Donny George,
if you want to remove noise while preserving edges, you may want to have
a look at Bilateral Filtering:
http://wbgn013.biozentrum.uni-wuerzburg.de/ImageJ/bilateral-filter.htmlBest,
Andreas
Am 7/28/2010 8:43 AM, schrieb Gluender:
> 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
--
Dr.-Ing. Andreas Maier
Stanford University
Department of Radiology
The Lucas Center for Imaging
Mail Code 5488, Route 8
Stanford, CA 94305
http://med.stanford.edu/profiles/Andreas_Maier/