[GRASS-dev] image processing

[Yann Chemin]

Hi psr,

(not a noise removal specialist)

but FFT can remove specific noise if combining FFT forward image with
some filters (i.e. FFT*filter_image) and FFT inverse it.

You have to look into the noise structure and detect noise pixel with
the FFT trick above, Identify noise pixels and set them to NULL
(r.null). Then use r.mfilter to replace them (Option: replace only
NULL Values) with any matrix-based filtering mode you like.

Yann

On 5 January 2011 14:51, fire jotawski <jotawski at gmail.com> wrote:
> hi sirs,
>
> apologized me indeed for disturbing this list but I really have questions if
> grass were able to use for image processing ?
>
> for example, I have a photo of gamma irradiation of some materials and want
> to remove noises, a dot or dots generated not from material , from that
> photograph, is it possible to use some of tools available in grass for this
> particular case ?
>
> many thanks in advance for any helps and hints and forgive me for my bad
> English.
>
> with best regards,
> psr
> --
>
>
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-- 
Yann Chemin
www.csu.edu.au