“…In case of boundary, many work focused on the Radial Distance Measure (RDM) )Boujelben et al (2009a (Alvarenga et al, 2006), Convexity (CVX), Fourier Fraction (FF) (Rangayyan et al, 1997), Fractal Dimension (FD) (Nguyen & Rangayyan, 2005) (Nguyen & Rangayyan, 2006) and the angular measure (Yang et al, 2005) (Denise et al, 2008) . However, methods defined in the context of angular measures provides so far either of the two categories: Radial Angle (RA) (Yang et al, 2005) or Turning Angle(TA) (Denise et al, 2008) . In this context, Sheng Chih et al (Yang et al, 2005) used the RA, which is the smallest angle included between the gradient direction and the radial direction of the edge.…”