678326.fig.0011a
(a)
678326.fig.0011b
(b)
678326.fig.0011c
(c)
678326.fig.0011d
(d)
Figure 11: Dragon image morphological gradient in RGB (a/b) and (c/d), using a disk-shaped SE with radius 3 pixels (a and c) and 5 pixels (b and d).