How to add 5% random Noise to the dataset in MATLAB

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Med Future
Med Future 2022-2-26
评论： Image Analyst 2022-3-1
Hello Everyone, I hope you are doing well.
I have the dataset attached below. i want to add 5% random Noise to the dataset. How can i do that in matlab
Any help appreciated :)
  2 个评论
Jan
Jan 2022-2-26
5% of what? Giving a percentage is a realtive expression. Then you have to define to which value this relation belongs to: 5% of maximum absolute value of the signal, 5% of each current value, 5% standard-deviation of the signal, 5% of the range, ...?
The actual data do not matters, but the definition of what you want to do is important.
Med Future
Med Future 2022-2-27
@Jan 5% percent of the curent value. Like if we have value of 200 the range should be between 205 and 195

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回答（1 个）

Image Analyst
Image Analyst 2022-2-27
Did you try
s = load('datasetvalue.mat')
dataset = s.dataset;
[rows, columns] = size(dataset)
noise = 0.1 * dataset .* (rand(rows, columns) - 0.5);
noisyData = dataset + noise;
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Med Future
Med Future 2022-3-1
@Image Analyst have you seen my above data, the 51 column has different value did it uniformly distributed?
Image Analyst
Image Analyst 2022-3-1
Yes, here is your data. It is not uniform. What is your definition of uniform?
You can make uniformly distributed data with rand, but if you're varying the mean value depending on another value (the pixel value in your data) then it's no longer uniform. You would have to have the mean and stardard deviation of the noise be not dependent on your signal values.

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