| Re: ratio imaging [message #29708] |
Fri, 08 March 2002 09:26  |
Craig Markwardt
Messages: 1869
Registered: November 1996
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Senior Member |
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Dan Larson <drl16@cornell.edu> writes:
> I am trying to do simple ratiometric
> imaging with IDL. Of course, since
> there is some pixelation noise, the
> ratio is not very robust. I have
> experimented with a number of
> different filters (median, Gaussian
> deconvolution, smooth) to try and
> remove some of this instability.
> Is there a filtering technique which
> is minimally perturbative that will
> remove some numerical artificats
> without changing the boundaries of
> objects?
Dan, you should be filtering the two images, *before* computing the
ratio, right? I would have said that goes without saying, but now I
am saying it. [ The reason of course is that the ratio does not have
a nice compact statistical distribution, so averaging is less
robust. ]
Craig
--
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Craig B. Markwardt, Ph.D. EMAIL: craigmnet@cow.physics.wisc.edu
Astrophysics, IDL, Finance, Derivatives | Remove "net" for better response
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