761901.fig.006a
(a)
761901.fig.006b
(b)
761901.fig.006c
(c)
761901.fig.006d
(d)
761901.fig.006e
(e)
Figure 6: (a) Inverse of FFA, (b) matched filter response of enhanced image, (c) high frequency component of image, (d) the produced image after thresholding, (e) the extracted vessels by applying length filtering.