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Re: flux-conserving image resampling? [message #47689]

Fri, 24 February 2006 08:04

edward.s.meinel@aero. is currently offline

edward.s.meinel@aero.
Messages: 52
Registered: February 2005

Member

If you are interested in the flux difference of two images of the same
star, can't you just calculate the total flux of each star and then
subtract the results? I assume you aren't looking at the sun, so the
star would be unresolved...

Ed

Marshall Perrin wrote:
> Bringfried Stecklum <stecklum@tls-tautenburg.de> wrote:
>> I did not check how well it preserves the flux. In any case, you can
>> force the total flux of the output image to be the same as that of the
>> input image.
>
> As Henry points out, this isn't really sufficient to ensure that the
> original flux stays in the right parts of the final image. That's important
> for my particular application, which is a dual-beam differential polarimeter.
> I'm trying to take a very precise difference between two images of
> the same star taken simultaneously on different parts of the detector,
> and thus merely enforcing total flux conservation lets light slop between
> the two stellar images (and the background too). Yes, it's a small effect,
> but I'm trying to -measure- a fairly small difference in the first place and
> thus care about this.
>
> - Marshall

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[Message index]

		Re: flux-conserving image resampling? By: edward.s.meinel@aero. on Fri, 24 February 2006 08:04
		Re: flux-conserving image resampling? By: Bringfried Stecklum on Fri, 24 February 2006 01:03
		Re: flux-conserving image resampling? By: Marshall Perrin on Thu, 23 February 2006 09:39
		Re: flux-conserving image resampling? By: henrygroe on Thu, 23 February 2006 08:00
		Re: flux-conserving image resampling? By: Bringfried Stecklum on Thu, 23 February 2006 00:32

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