678326.fig.004a
(a)
678326.fig.004b
(b)
678326.fig.004c
(c)
678326.fig.004d
(d)
678326.fig.004e
(e)
678326.fig.004f
(f)
678326.fig.004g
(g)
678326.fig.004h
(h)
678326.fig.004i
(i)
Figure 4: Miró painting (a) with its erosion (b/f), dilation (c/g), opening (d/h), and closing (e/i) with a disk of radius 3 pixels. Method of Angulo in the RGB (b to e) and (f to i) spaces choosing black as the reference color.