how to detect noise in an image?

how to detect noise in an image?

Answer 1

You're not the first:

http://www.mathworks.com/matlabcentral/answers/52882-image-noise-estimation-image-processing

http://www.mathworks.com/matlabcentral/answers/35826-removing-the-noise

http://www.mathworks.com/matlabcentral/answers/11052-code-to-calculate-noise-using-a-single-image

http://www.mathworks.com/matlabcentral/answers/56974-how-to-reduce-noise-in-image

http://www.mathworks.com/matlabcentral/answers/822-image-noise-detection-and-reduction

http://www.mathworks.com/matlabcentral/answers/24282-image-processing-noise