Figure 4

Examples of shapes used for performance evaluating . (a) Original shape. (b) The shape transformed by nonuniform scaling$\left(s_x/s_y=0.5\right)$. Nonuniform scaling contributes to the shape distortion. (c) The shape rotated by 30°. (d) The shape obtained by adding noise with SNR = 20dB. (e) The shape transformed by shearing with k = 2. The shearing also contributes to the shape distortion.