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Re: [APML] OT: Lunar Mosaic
Frank, you are too modest - it is a beautiful picture!
Stuart
Frank Barrett wrote:
> Juan,
>
> Your work totally blows mine away, so I feel a bit awkward replying <g>.
> The *only* thing I find detracting in your excellent image are presence of
> the seams which are furthur enchanced by the deconvulution. I find it
> best to adjust the brightness levels of the individual segments and patch
> up any remaining seams before applying sharpening techniques. The other
> technique I've found useful when combining multiple frames for mosaics is
> to crop the resultant segment slightly to remove edge noise inherent when
> not all frames are completely aligned. Anywho, you probably know this
> already.
>
> I don't see how, but if you find a way to improve the deconvolution I
> would sure like to know how you do it. This is one area where I really
> need to learn more. Does anyone know of any web or other resources that
> discuss this subject matter?
>
> FWIW, here's my latest attempt at a lunar mosaic, though it doesn't hold a
> candle to your work, it is the best I've been able to accomplish so far.
> It's a 25 frame mosaic at f/6 on a C8 on a night with relatively good
> seeing:
>
> http://celestialwonders.com/FirstQuarterMosaic.html
>
> --
> Frank Barrett
> frankb@celestialwonders.com
> http://celestialwonders.com
>
> > Hello all,
> >
> > Forgive me for this off-topic post, but I just wanted to share our last
> > results. Mother Nature has gifted us with three unusually stable nights
> > due to extremely humid air filling our valley directly from the
> > Mediterranean Sea. Humidity was so high that we were forced to push our
> > (home-made) dew protection system to its maximum power: 32 watts
> > heating the metallic ring that holds the correcting plate of our S/C.
> > Here you can see one of our first results: a mosaic of the lunar
> > terminator built from 24 images:
> >
> > http://www.pleiades-astrophoto.com/gallery/webcam/20030310/mosaic-VC(12,Gaussian(2.0,2.0)).3500.jpg
> >
> > The camera is a Philips ToUCam Pro and the scope a Meade LX200 12"
> > Schmidt-Cassegrain at prime focus (f/10). Each image is the integration
> > of 300 to 500 video frames captured, selected, aligned and averaged
> > with K3CCDTools. The mosaic was constructed in Photoshop 6. Finally, we
> > applied 12 iterations of the Van Cittert deconvolution algorithm with a
> > gaussian function of radius 2.0 taken as the PSF (own software). The
> > above image has been reduced to 3500 pixels wide and weights 1.2 MB.
> >
> > Here is the image prior deconvolution:
> >
> > http://www.pleiades-astrophoto.com/gallery/webcam/20030310/mosaic.3500.jpg
> >
> > This is our first "big" lunar mosaic, so it contains several errors. You
> > can easily see some "patches" covering small areas were we missed data,
> > and some limits between different frames are also too visible. Also, I
> > think we must fine-tune deconvolution somewhat.
> >
> > Comments are always welcome,
> > ______________________________________
> > Juan Conejero, Pleiades Astrophoto
> > skycad@ctv.es
> > http://www.pleiades-astrophoto.com/en.html
> >
> >
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>
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