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Re: [APML] OT: Lunar Mosaic
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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