How can i MakeNoise to the dataset dataset

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 ???

Answer 1

[Wayne King]

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

[Mariem Harmassi]

ok thank u it s an image.

[Mariem Harmassi]

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

Answer 2

[Wayne King]

Do you have the Image Processing Toolbox? If so, see the help for imnoise