CODEWITHSUNDEEP
image-processing
Bi.
Bi.

Reputation: 1906

Image noise filtering

I am looking for inputs on an image noise filter method. A 9-pixel median filter does not work very well with dense noise. Noise is periodic (periods of 50 lines) and additive.

Thanks, Bi

Upvotes: 3

Views: 769

Answers (2)

Ian Hopkinson
Ian Hopkinson

Reputation: 3432

What about filtering in the Fourier domain? If the noise is periodic then with any luck your noise will appear as a pair of nice pointy features in Fourier space, where you can filter them with a couple of Gaussians then transform back to real space and your periodic noise should be gone.

Upvotes: 6

David
David

Reputation: 2174

I like to use selective blurs, which finds the average of only the surrounding pixels whos values are within a certain range from the value of the center pixel.

Gimp has a weighted version of this called "selective gaussian blur" you could try to see what this looks like.

Upvotes: 2

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