uniform image

how can we determine characteristic noise from image.

[Titus Edelhofer]

To me this sounds more like a question to ask google instead of MATLAB answers?

[Image Analyst]

I guess you could use MATLAB. Or check here: http://www.mathworks.com/matlabcentral/answers/6200-tutorial-how-to-ask-a-question-on-answers-and-get-a-fast-answer

What does "determine" mean? How about you just subtract your signal and then you have your noise signal? Not what you want? Well......