On 24 Mar, 02:49, Greg Hennessy wrote:
In the world of CCDs,noiseis truenoise.

And yet, there exist effects called "noise", such as readnoise, shotnoise, and fixed patternnoise. If you want to spend time arguing that
"fixed patternnoise" isn'tnoise, knock yourself out.

First thanks to both of you, your discussion was useful.
Then, I'm sorry, I didn't replay to your posts since I had some
personal problem and now I'm back at work.
So thanks again for your ideas.
I will look at the flat fielding technique in the suggested book, I
think it could help me finding a noise estimation approach.
Any further hint is appreciated.
Gio