Re: FFT in imagej for noise removal

[Daniel James White]

Hi all,

... and yes , the bilateral filter is in the Fiji distribution of imageJ!
        Plugins - Process - Bilateral Filter
which is the same as
http://wbgn013.biozentrum.uni-wuerzburg.de/ImageJ/bilateral-filter.html

cheers

Dan


On Jul 29, 2010, at 6:00 AM, IMAGEJ automatic digest system wrote:

> Date:    Wed, 28 Jul 2010 09:12:10 -0700
> From:    Andreas Maier <[hidden email]>
> Subject: Re: FFT in imagej for noise removal
>
> 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.html
>
> Best,
>
> 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. Daniel James White BSc. (Hons.) PhD
Senior Microscopist / Image Visualisation, Processing and Analysis
Light Microscopy and Image Processing Facilities
Max Planck Institute of Molecular Cell Biology and Genetics
Pfotenhauerstrasse 108
01307 DRESDEN
Germany

[phone] (German Mobile)
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