MATLAB: Random noise matlab.

matlab function

how to add random noise to image in matlab?

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There are many choices you might make for the distribution of the noise. For independent additive Gaussian noise you could do this:

noisyImage = originalImage + noiseAmplitude * randn(size(originalImage));

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MATLAB: Noises

Speckle noise is a multiplicative noise, where the images is multiplied element by element by a matrix of uniformly distributed (not Gaussian) noise with 0 mean and some variance.

Gaussian noise (which has a different distribution than speckle noise) is usually used as additive noise, i.e. the noise matrix is added to the image matrix.

MATLAB: How to add uniform noise to an image using imnoise. is there defind Description like ‘gaussian’, ‘speckle’ etc.

imnoise() does not support uniform noise.

NewImage = OldImage + scale * rand(size(OldImage));

where scale is the maximum magnitude you want to use.

Note: if the image is a floating point data class, you should use

NewImage = min(1, OldImage + scale * rand(size(OldImage)));

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Related Solutions

MATLAB: Noises

MATLAB: How to add uniform noise to an image using imnoise. is there defind Description like ‘gaussian’, ‘speckle’ etc.

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