# How can i MakeNoise to the dataset dataset

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Mariem Harmassi le 15 Sep 2012
I found this code in matlab file D_SUB=MakeNoise(D_SUB, Noise) Does the MakeNoise exist ? It is a matlab function if no how can i make noise to a dataset ???
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### Réponse acceptée

Wayne King le 15 Sep 2012
MakeNoise.m is not a MathWorks' function, but there are many ways to add noise to a signal or image using MathWorks' functions. Is it an image that you want to add noise to (a matrix), or a signal (a 1-D vector)? What kind of noise do you want to add?
Look at the help for:
randn
rand
imnoise
awgn
wgn
to get you started
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Mariem Harmassi le 15 Sep 2012
Modifié(e) : Mariem Harmassi le 19 Oct 2012
ok thank u it s an image.
Mariem Harmassi le 19 Oct 2012
hi ,thank for the answer i found this function available through the net function D = MakeNoise(D, Noise) if Noise~=1 rannum=exp(normrnd(0,log(Noise),size(D,1),size(D,2))); D=D.*rannum; end end and i want to know how can i express the level of noise based on thsi function ? % i need a percent

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### Plus de réponses (1)

Wayne King le 15 Sep 2012
Do you have the Image Processing Toolbox? If so, see the help for imnoise
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