Re: 20030725 NOAA0652 sunspo

From: Eric Ng (ericng_at_cuhk.edu.hk)
Date: 07/25/04 

Date: Mon, 26 Jul 2004 00:39:30 +0800

Hi John,

Thanks for your comment. I seldom use Maximum Entropy for my webcam image.
Those images were processed with mild wavelet processing in Registax and
unsharp masking in photoshop. As the webcam I used is a BW CCD in RAW mode,
the noise is very minimal.

Just curious why you think those "noise" you think was caused by Maximum
Entropy? Actually any sharpening filter can enhance the visibility of the
noise. That is very kind of you if you could highlight the noise on my
image, I will try using another processing approach and see whether it can
be improved.

Cheers,

Eric Ng

"John Moore" <xxxxx@none.net> ¦b¶l¥ó
news:A7RMc.13817$f4.8447@newsread3.news.atl.earthlink.net ¤¤¼¶¼g...
> These aren't too bad, Eric, although if you're using maximum entropy for
> enhancement, you have to be careful not to intoduce excessive noise along
> with the granulation. Did you use max ent here? Just wondering, because
I
> see a bit of noise.
>
> John Moore
>
> "Eric Ng" <ericng@cuhk.edu.hk> wrote in message
> news:ce0lfo$m6f1@imsp212.netvigator.com...
> > Dear friends,
> >
> > Attached was the NOAA0652 sunspot group captured on 25 July, 2004 with
4"
> > APO refractor and BW ToUCam Pro at F20 and F40 respectively.
> >
> > Wish you like it.
> >
> > http://www.ort.cuhk.edu.hk/ericng/20040725-NOAA0652-closeup.jpg
> >
> > http://www.ort.cuhk.edu.hk/ericng/20040725-NOAA0652.jpg
> >
> > Regards,
> >
> > Eric
> >
> >
>
>

Relevant Pages

  • Re: 20030725 NOAA0652 sunspo
    ... > Hi John, ... I seldom use Maximum Entropy for my webcam image. ... > the noise is very minimal. ... The noise appears as extra bright, white regions either over the granulation ...
    (sci.astro.amateur)
  • Re: 20030725 NOAA0652 sunspo
    ... Highlight those noise with a circle or arrow would be useful. ... I seldom use Maximum Entropy for my webcam image. ... >> John Moore ...
    (sci.astro.amateur)
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