Actually I want to apply notch filter to remove specific pattern in image just like (line ,circle ,etc..) . I want to remove some specific frequency of line or circle using notch filter or any other way of removing. Can some one guide me how can I remove specific repetitive pattern from image just like circle or line. if you give some example code it help me a lot. because currently I can not understand how I apply filter or notch to remove certain repetitive pattern form Image. Waiting to hear from you soon.
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Gujjar Ad
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Does my answer to [this](https://stackoverflow.com/questions/29235421/find-proper-notch-filter-to-remove-pattern-from-image) question help? It's a matlab related question but the explanation should stand on its own. – jodag Nov 19 '17 at 10:03
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Posting an image might help. – Mark Setchell Nov 19 '17 at 10:34
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@MarkSetchell please see the image and guide me how can I remove the repetitive Line structure from image? – Gujjar Ad Nov 20 '17 at 14:29
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Spectral Analysis is not "my thing", but the steps are as follows.
Take your original image and perform FFT to generate:
- phase image
- magnitude image
- spectrum (on a log scale)
You seem to have that already. Now take the spectrum image:
and mask out all the off-centre highlights with a different colour, like this:
and difference that with the original spectrum so you get a mask of your edits like this:
Multiply that newest mask with the original magnitude, combine with the original phase and do the inverse FFT. I got this as a result of my sloppy editing and abilities!
Mark Setchell
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Please Can you share the code it give me more help to play with. Thanks – Gujjar Ad Nov 21 '17 at 03:55
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I didn’t use **OpenCV** as I was just showing the technique and I didn’t want to write, compile and test code. I just used **ImageMagick** at the commandline to do the FFT, difference, multiply and Inverse FFT. – Mark Setchell Nov 21 '17 at 07:24