136034.fig.0015a
(a)
136034.fig.0015b
(b)
136034.fig.0015c
(c)
136034.fig.0015d
(d)
Figure 15: Segmentation using conventional hard thresholding and curvelet-based segmentation. (a) Denoised spatial domain. (b) First level in wavelet domain. (c) Ridgelet domain. (d) Curvelet domain.