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how to implement a MATLAB function to add Gaussian noise ?

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mina
mina 2012-4-6
I need to implement a function in Matlab to add Gaussian noise to an image let's say cameraman.tif but without using imnoise
Thanks in advance

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回答（3 个）

Rick Rosson
Rick Rosson 2012-4-7
>> doc randn
Rick Rosson
Rick Rosson 2012-4-7
function y = addWhiteNoise(x,snr)
%
% snr is the signal-to-noise ratio expressed in decibels
%
stdev = ...
z = stdev*randn(size(x));
y = x + z;
end
  2 个评论
mina
mina 2012-4-7
thanks for your help.
but this is what i need to do exactly:-
implement a MATLAB function to add Gaussian noise to the image “Cameraman.tif” and compute the signal-to-noise ratio (SNR)

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Rick Rosson
Rick Rosson 2012-4-7
Hi Mina,
What have you done so far? Please post your code.
Thanks!
Rick

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