How I can use notch filter

How i can use notch filter and apply on original image ?

Or what's the code can use to obtain the same result in shown image 4.6 .

thank you ...

Answer 1

[Pratheek Punchathody]

Similar query has been addressed in the community. Refer to the following Link.

Also refer to the documentation on "fdesign.notch" for more information.

Answer 2

[Star Strider]

To subtract the frequency at (0,0) (essentially the D-C or constant offset), subtract the mean of the grayscale image from the image matrix (assuming a 2D, not 3D, image matrix).