text: The available methods include use of texture (Binder et al., 1999), local phase (Mulet-Parada and Noble, 2000), a gradient-based deformable model (Coppini et al., 1995), a region-based deformable model (Lin et al., 2003; Mignotte et al., 2001), and pixel-wise clustering (Boukerroui et al., 2003).