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Apply TodayMATLAB Central > MATLAB Newsreader > Imnoise problem with double type image 

Subject: Imnoise problem with double type image From: JForma Forma Date: 15 Jan, 2009 08:13:03 Message: 1 of 3 
Hi, 
Subject: Imnoise problem with double type image From: Image Analyst Date: 15 Jan, 2009 16:30:20 Message: 2 of 3 
"JForma Forma" <jussi911@luukku.com> wrote in message <gkmr6f$4e1$1@fred.mathworks.com>... 
Subject: Imnoise problem with double type image From: Rachel Date: 12 Jun, 2012 05:39:09 Message: 3 of 3 
Sounds like 'law of large numbers' at work. With double precision, MATLAB scales it up by 1e12 and creates a poisson noise based on the new values, which means your mean is scaled up by 1e12. MATLAB then scales the value down by 1e12. It's equal to averaging a bunch of random variables with the same poisson distribution. 
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