CODEWITHSUNDEEP
matlabimage-processingsignal-processingnoise-generator
user2378404
user2378404

Reputation: 85

Adding high frequency noise to images in matlab

The function imnoise adds noise to the image. How can I add only high frequency noise?

Upvotes: 1

Views: 1481

Answers (2)

shoelzer
shoelzer

Reputation: 10708

If you generate noise samples with a flat spectrum (white noise), it will contain all frequencies. Then you can filter that noise to shape it any way you want. For high frequency noise, you would want a high pass filter.

Upvotes: 1

Zaphod
Zaphod

Reputation: 1927

High frequency noise in appears mainly as "salt and pepper" noise. So to introduce this kind of noise, pick N pixels at random and change their intensities randomly. The randomness implicitly does the job of a high pass filter, because it is unlikely that many neighbouring pixels will be picked among the N.

Upvotes: 1

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