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I am trying add Gaussian noise to image with 10db using i imnoise(I,'gaussian',0,1) function in matlap. 
"mayan mayan" <mayan_n@yahoo.com> wrote in message <ib12dj$4fg$1@fred.mathworks.com>... 
"Sean " <sean.dewolski@nospamplease.umit.maine.edu> wrote in message <ib137u$sqp$1@fred.mathworks.com>... 

So does the pixel value represent the amplitude or the power? 
(1) I am planning to have upto 10 dB noise on each pixel. 
For #2, that was my mistake. 
"mayan mayan" <mayan_n@yahoo.com> wrote in message <ib8o5e$39p$1@fred.mathworks.com>... 
"Cris Luengo" <cris.luengo@google.for.my.name.to.contact.me> wrote in message <ib9cab$9kl$1@fred.mathworks.com>... 
i used SNR = 20log(signal mean / noise standard deviation) 
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