how can i add noise to the image??

in matlab how can i add guassian noise to an image

Answer 1

[Evan]

Do you have the image processing toolbox? If so, you might find imnoise useful.

http://www.mathworks.com/help/images/ref/imnoise.html?searchHighlight=imnoise

Answer 2

[Iain]

 my_noisy_image = cast(randn(size(my_image))*sigma,class(my_image)) + my_image;