Re: [APML] A Different View of Venus' Atmosphere?

[<pleiades2004@pleiades-astrophoto.com>]

> Juan,
>
> When processing my solar images I noticed that using wavelets created a
lot
> of artifacts.  I just used unsharp masking for my images.  This is a
> problem we have with software processing.  At time, one can't tell what is
> real and what is an artifact.  The best is to analyze the raw images.

Hi Chris,

Indeed we must be sure we don't introduce false elements in our images, or
we are not doing astrophotography. But that doesn't mean we must limit
ourselves when processing images; it just says that processing at some
levels is an extremely delicate task.

Actually, wavelets are very powerful in image processing. They give us a
rigorous and flexible analysis tool, but no doubt they can be wrongly used,
just as any other processing resource. I must recognize I'm a wavelet
addict. IMO, when one gets accustomed and skilled using (good) wavelet
tools, unsharp mask becomes almost useless, it's just too rough.

In the document I've just uploaded to our site (see my previous message), I
discuss how wavelets can be used precisely in order to be sure we are
enhancing significant structures only, and not creating artifacts.

Regards,

Juan

-- 
-------------------------------------------------
Juan Conejero, Pleiades Astrophoto
juan.conejero_at_pleiades-astrophoto.com
http://pleiades-astrophoto.com/
-------------------------------------------------


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