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From: "Ashish Uthama" <ashishu@ece.ubc.ca>
Newsgroups: comp.soft-sys.matlab
Subject: Re: How to discover image noise in MATLAB?
Date: Fri, 07 Mar 2008 16:44:45 -0500
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> While identifing, i should use image noise for
> comparing all images that i took before.

Am sorry, I do not follow.


You would want a so-called 'gold' standard to compare against to get the  
noise. Maybe you could get an 'ideal' image and then compare the test  
image against it? (you can then use various measure: MAD etc)

googling for
   image noise estimation
might help


On Fri, 07 Mar 2008 10:16:33 -0500, emre baykal  
<20393289@mail.baskent.edu.tr> wrote:

> Hello there. i am a senior student in electrical
> engineering. My term Project is about to identify source
> camera. While identifing, i should use image noise for
> comparing all images that i took before. What i am asking
> is how i can find or obtain the noise of any image. i have
> looked at all topics and workouts about this subject. All
> of them are about denoising or removing the noise. it is
> useless for me at this time. Anyway, if you have any idea
> or if you did any Project like this before can you tell me
> how i can obtain the noise of an image in MATLAB. Thanks.