Aw: Re: median filter that preserves peaks

Posted by Robert Kirmse-2 on Sep 06, 2013; 9:12am
URL: http://imagej.273.s1.nabble.com/median-filter-that-preserves-peaks-tp5004693p5004700.html

I don't know what the image data in question is from the original posting
and therefore I might be totally of.
For me it sound like Anisotropic diffusion filtering might be interesting for you.
This filtering is aimed at noise reduction but also preserving image features
at the same time.
 
Again I might be totally of in my interpretation of the original question.
 
Cheers
Robert
 

Gesendet: Freitag, 06. September 2013 um 10:57 Uhr
Von: "Gabriel Landini" <[hidden email]>
An: [hidden email]
Betreff: Re: median filter that preserves peaks
On Friday 06 Sep 2013 00:12:38 you wrote:
> Does ImageJ have a plugin that does what the median filter does, but also
> preserves peaks? The median filter, even at a radius of 2, tends to flatten
> sharp peaks.

Is there such a thing? The purpose of the medial filter is precisely to get
rid of the extreme values.

Maybe some adaptive filtering would work instead? E.g. find the gradients in
the image and then do a weighted gaussian average, using as weightings the
inverse of the gradients (so regions with few gradients get more averaged than
those with lots?
Cheers

Gabriel

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