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Re: ratio imaging [message #29800 is a reply to message #29710]

Wed, 13 March 2002 03:03

the_cacc
Messages: 104
Registered: October 2001

Senior Member

Yo,

My $0.02... be a bit wary about filtering, it won't do magic for you
(obviously!). However it will do *something*. Be curious about what
that is...

Consider you have N + n1 (numerator + noise) and D + n2 (denominator +
noise) and you are forming (N+n1)/(D+n2). What you really want is N/D,
right? Filtering will give you <N+n1>/<D+n2>, where <> implies some
sort of filtering. Ideally, <N+n1>=N and <D+n2>=D but it won't ever in
reality. If you have an analytical expression for what N and D are,
you might be able to work out what's going on analystically. Otherwise
do some simulations and check that the <N+n1>/<D+n2> you are forming
is approximately the N/D you want. Choose you filter, if any, on this
basis.

Ciao.

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[Message index]

		ratio imaging By: Dan Larson on Fri, 08 March 2002 08:31
		Re: ratio imaging By: gerhard.holst on Wed, 13 March 2002 04:39
		Re: ratio imaging By: the_cacc on Wed, 13 March 2002 03:03
		Re: ratio imaging By: Dan Larson on Tue, 12 March 2002 08:54

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