813281.fig.009a
(a)
813281.fig.009b
(b)
813281.fig.009c
(c)
813281.fig.009d
(d)
Figure 9: (a) denoised signals for defect-free, gouged, and dent pipes. Continuous wavelet transforms for defect-free, gouged and dented pipes when water flows through the pipes, (b) for Daubechies (db4) function, (c) for Symlet (sym4) function, and (d) for Meyer function.