Question $4$: $(20$ points$)$

$1.$ If the original image is the one in Fig. $($a$),$ and the resulting image after some processing is the one in

$($b$),$ What is the most likely processing from the list below to give this result? answer $)(7\mathrm{.}5$ points$)$

a$)$ Edge detection by a Laplacian operator

b$)$ High pass filtering, by subtracting a low pass filtered version of the image from the original image

c$)$ Median filtering followed by an edge detection

d$)$ Edge detection followed by a median filtering