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Re: CCD saturation [message #63023 is a reply to message #63022]

Fri, 24 October 2008 15:23

Marshall Perrin
Messages: 44
Registered: December 2005

Member

Wox <wout.de.nolf@gmail.com> wrote:
> Hi all,
>
> Does anyone have any experience in correcting images for saturation
> streaking? See image b in
> http://learn.hamamatsu.com/articles/images/bloomingfigure1.j pg
>
> I tried to do something with IDL's sobel+contour but it seems hard to
> preserve the spots without streaking while removing the saturated ones
> along with its stripes. Any ideas?

Shape detection is not the way to go here, versus detecting the level
at which pixels saturate. There should be some characteristic number of
counts per pixel below which you know data is not saturated.

Bear in mind there is no real way to do more than cosmetic corrections
to such images. Whatever pixel values were originally 'underneath'
the saturation streaks are now permanantly lost. So you can make a prettier
picture if you want, but for quantitative photometry or other analysis you'll
have to consider alternate approaches. In some cases, like for HST ACS,
the total number of counts from a source is preserved, even as the light
gets smeared out into the wrong pixels.

- Marshall

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[Message index]

		Re: CCD saturation By: Wox on Sat, 25 October 2008 06:33
		Re: CCD saturation By: Marshall Perrin on Fri, 24 October 2008 15:23
		Re: CCD saturation By: JMB on Mon, 27 October 2008 09:47
		Re: CCD saturation By: pgrigis on Mon, 27 October 2008 06:27

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