Refer to the image and the disk structuring element shown in the lower right of the image. Sketch

what the sets C$,$ D$,$ E$,$ and F would look like for

the following sequence of operations: CAB $=|$ ;

D C$=\{$ B; EDB $=\{$ ; and FEB $=|.$ Set A

consists of all the foreground pixels $($white$),$

except the structuring element, B$,$ which you may

assume is just large enough to encompass any of

the random elements in the image. Note that the

sequence of operations above is simply the opening of A by B followed by a closing of the result

by B$.$