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Re: digital phantom [message #8264]

Fri, 21 February 1997 00:00

Achim Hein
Messages: 42
Registered: February 1996

Member

Phil Williams wrote:
>
> I'm in the process of generating a digital phantom to test some code
> that I have written and was wondering if anyone has written a gaussian
> noise generator before I go and do it myself.
If I understand you right, you are looking for noise generators.
IDL offers you two kinds: one to get uniformly distributed noise, the
other one to get gaussian (in IDL it is called normally distributed)
noise.

uniformly : uni=2.*!PI*randomu(seed,N)-!Pi
gaussian : gaus=(2.*!PI*randomn(seed,N)/12.
(to get identical variance you have to multiply these factors)

triangle distribution: tri=(uni1+uni2)/2.
gaussian with small variance: gaus_small=(gaus1+gaus2+...+gausN)/N

Cheers

Achim
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