813281.fig.007a
(a)
813281.fig.007b
(b)
813281.fig.007c
(c)
813281.fig.007d
(d)
813281.fig.007e
(e)
813281.fig.007f
(f)
Figure 7: Comparison of experimental signals for defective and defect-free pipes using different wavelet functions with a scale of 256 for (a) db4, (b) sym4, (c) coif2, (d) gauss1, (e) Meyer, and (f) Mexican hat wavelet functions.