Compute the magnitude of gradient for the central pixel in the below figurea$)$ The first row in the figure below shows an image $($original$)$ and its cor$-$

responding frequency domain $($frekvensdom$$n$).$ The row in the middle

displays different frequency domains $($frekvensdom$$n I$-$IV$)$ after that

some areas have been nulled $($black areas$).$ An inverse Fourier trans$-$

form of the frequency domains end up in four different images $($bild

$1-4).$ Combine each image $(1-4)$ with its corresponding frequency do$-$

main $($I$-$IV$)$

b$)$ Motivate your choices.

using the Sobel masks.