Morphological Operations

Image: Cross (5 pixels tall and wide)

cross (5 pixels tall and wide) dilated and eroded by 1×2 rectangle

cross (5 pixels tall and wide) dilated and eroded by 2×1 rectangle

cross (5 pixels tall and wide) dilated and eroded by 2×2 square

cross (5 pixels tall and wide) dilated and eroded by cross (3 pixels tall and wide)

cross (5 pixels tall and wide) dilated and eroded by 2×2 diagonal

My predictions for a cross 5 pixels tall and wide being dilated(black ink) and eroded(green ink) by the structuring elements located along the top. Blank indicates that no pixels were left after erosion.