215295.fig.0014a
(a) 1
215295.fig.0014b
(b) 2
215295.fig.0014c
(c) 3
215295.fig.0014d
(d) 1
215295.fig.0014e
(e) 2
215295.fig.0014f
(f) 3
Figure 14: (a)–(c) Boundaries of detected cracks at different times; (d)–(f) extracted centerlines of detected cracks by morphological skeltonization.