175271.fig.003a
(a)
175271.fig.003b
(b)
175271.fig.003c
(c)
175271.fig.003d
(d)
Figure 3: (a) The preprocessed binary image for identifying the lumen boundary; (b) and candidate seed points (yellow points) for the image; (c) 3D plot for . It is scaled as a range from 0 to 255; (d) the boundary of lumen segmented by candidate seed (green line).