how to create a notch filter for the image to remove noise?

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Siddardha Mamillapalli on 19 Dec 2016

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Commented: Image Analyst on 5 Jun 2020

Accepted Answer: Image Analyst

i have an image with periodic noise

after applying the fourier transform and fftshift i got

help me to design the notch filters to remove the noise

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Accepted Answer

Image Analyst on 19 Dec 2016

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https://in.mathworks.com/matlabcentral/answers/317402-how-to-create-a-notch-filter-for-the-image-to-remove-noise#answer_247734

fft_filter.m

See my FFT filter demo, attached.

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Karissa Tilbury on 5 Jun 2020

Can I ask how the amplitudeThreshold in line 73 is determined? Trial and error? Or did you use some histogram approach? Also curious about line 87 where you removed the brightSpike for DC between rows 115-143. How did you know this was the location?

Image Analyst on 5 Jun 2020

Siddarha, that image does not have periodic noise.

Karissa, the threshold is determined by trial and error. Adjust it until you get the best result.

The DC spike will always be exactly at the exact center of the spectrum.

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