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How to know that periodic noise is present in an image or not.

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Vineet Gupta
Vineet Gupta on 19 Aug 2020
Commented: Vineet Gupta on 1 Sep 2020
Given a set of images that initally do not have periodic noise. Now from whole set we select some random images and introduce some periodic noise to them.
Now i have the whole set from which some images have periodic noises. And i have to write a code to recognise which images have been modified or which images have periodic noise.
Here i do not have the periodic noise which is inserted, i only have a set of images which include modified as well as originall images and now i have to tell which images are modified.

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Vineet Gupta
Vineet Gupta on 19 Aug 2020
can we analyse spectrum to recognise whether original image has peridic noise or not

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Answers (1)

Pranav Verma
Pranav Verma on 26 Aug 2020
Hi Vineet,
As pointed by you in the comments, you can try analysing the spectrum of the image for periodic noise. You can try FFT for this purpose. Please find below the documentation for the FFT in MATLAB:
For further information on how to check the periodicity of a signal in MATLAB, please refer to the below link:

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