Re: [APML] van Cittert Deconvolution

["Chris Schur" <cschur@cybertrails.com>]

Frank, I     like that Plato shot, I have found that Van cittert can yield
arc second resolution in what at first looks like hope less lunar shots.
Here are some of my results:

http://www.psiaz.com/schur/astro/latest19.html

http://www.psiaz.com/schur/astro/latest20.html


Chris
Astrophotograpy site: http://www.PSIAZ.com/schur/astro/index.html

----- Original Message -----
From: Frank Barrett <frankb@celestialwonders.com>
To: Discussion of Film Astrophotography <astro-photo@seds.org>
Sent: Saturday, March 15, 2003 6:27 PM
Subject: Re: [APML] van Cittert Deconvolution


> Thanks Bert.  Nice image! I have SGBNR, but haven't tinkered with it much.
> I will add these techniques to my arsenal.  What a great group!
> -----
> Frank Barrett
> http://celestialwonders.com
>
> ----- Original Message -----
> From: Bert Katzung <katzung1@attbi.com>
> To: Discussion of Film Astrophotography <astro-photo@seds.org>
> Sent: Saturday, March 15, 2003 6:15 PM
> Subject: Re: [APML] van Cittert Deconvolution
>
>
> > Hi Frank:
> > You have gotten great results with vanCittert! I had the same reaction
> when
> > I first used it:
> >
>
http://www.astronomy-images.com/images/Solarsystem/waxing-moon-67percent-hir
> > es.htm
> > That image didn't look like anything much until I applied vanCittert.
The
> > Altai scarp, for instance, was almost invisible.
> > For reducing noise, I  just used the Gaussian blur in Photoshop. You
might
> > be able to get better results with SGBNR.
> > Bert
> >
> > Bert Katzung
> > katzung1@attbi.com
> > www.astronomy-images.com
> >
> > ----- Original Message -----
> > From: "Frank Barrett" <frankb@celestialwonders.com>
> > To: <astro-photo@seds.org>
> > Sent: Saturday, March 15, 2003 1:39 PM
> > Subject: [APML] van Cittert Deconvolution
> >
> >
> > > If this is slightly off topic, please forgive me this one
indiscretion.
> > > There seemed to be some recent interest in deconvolution so I thought
I
> > > would share some of my early results with this technique.  It's very
> > > exciting.
> > >
> > > After seeing Juan's wonderful mosaic yesterday I went home and cracked
> > open
> > > a recently acquired book "The Handbook of Astronomical Image
Processing"
> > > which comes with the AIP4WIN software.  In it I learned of the magic
of
> > > deconvolution and was pleased to find that the software contains the
van
> > > Cittert algorithm.  I experimented with this on my first quarter
mosaic
> > and
> > > found that it did crisp things up a bit, but if I went "too" far it
> seemed
> > > to bring out a lot of noise in the darker regions.  Anyone know how to
> > > mitigate this?
> > >
> > > http://celestialwonders.com/FirstQuarterMosaic.html
> > >
> > > I also took the opportunity to process a four frame mosaic of the
Plato
> > > crater region taken at f/20.  Each individual frame is a median
combine
> of
> > > 12 of the best out of 20 frames.  With this I was able to go 250
> > iterations
> > > with van Cittert deconvolution.  The results just blew me away!  It's
> > liked
> > > I've discovered a whole new dimension to this hobby!  The page
contains
> > the
> > > raw convoluted image as well as the processed image for comparison.
> > >
> > > http://celestialwonders.com/Plato.html
> > >
> > > Comments welcome!
> > > -----
> > > Frank Barrett
> > > http://celestialwonders.com
> > >
> > >
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> > >
> >
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