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Re: [APML] van Cittert Deconvolution
> 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, I appreciate the links. I've bookmarked the deconvolving article
for future reference...very informative. I also noticed the gamma shift you
speak of after van Cittert.
-----
Frank Barrett
http://celestialwonders.com
----- Original Message -----
From: Chris Schur <cschur@cybertrails.com>
To: Discussion of Film Astrophotography <astro-photo@seds.org>
Sent: Saturday, March 15, 2003 8:35 PM
Subject: Re: [APML] van Cittert Deconvolution
>
>
> 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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