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

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Siddardha Mamillapalli
Siddardha Mamillapalli 2016년 12월 19일
댓글: Image Analyst 2020년 6월 5일
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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Image Analyst
Image Analyst 2016년 12월 19일
See my FFT filter demo, attached.
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Karissa Tilbury
Karissa Tilbury 2020년 6월 5일
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
Image Analyst 2020년 6월 5일
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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