External Fractional-Order Gradient Vector Perona-Malik Diffusion for Sinogram Restoration of Low-Dosed X-Ray Computed Tomography
Figure 3
LDCT images in Figures 1(b) and 1(d) processed by FOPMD and EFOGV-PMD with different iteration numbers and the fractional-order . The first column: iteration number is 3; the second column: iteration number is 8 and the third column: iteration number is 15. The first row: Figure 1(b) processed by FOPMD; the second row: Figure 1(b) processed by EFOGV-PMD; the third row: Figure 1(d) processed by FOPMD and the fourth row: Figure 1(d) processed by EFOGV-PMD.
(a) LDCT image in Figure 1(b) processed by FOPMD in [9] with , , and and iteration number is 3
(b) LDCT image in Figure 1(b) processed by FOPMD in [9] with , , and and iteration number is 8
(c) LDCT image in Figure 1(b) processed by FOPMD in [9] with , , and and iteration number is 15
(d) LDCT image in Figure 1(b) processed by EFOGV-PMD with , , and and iteration number is 3
(e) LDCT image in Figure 1(b) processed by EFOGV-PMD with , , and and iteration number is 8
(f) LDCT image in Figure 1(b) processed by EFOGV-PMD with , , and and iteration number is 15
(g) LDCT image in Figure 1(d) processed by FOPMD in [9] with , , and and iteration number is 3
(h) LDCT image in Figure 1(d) processed by FOPMD in [9] with , , and and iteration number is 8
(i) LDCT image in Figure 1(d) processed by FOPMD in [9] with , , and and iteration number is 15
(j) LDCT image in Figure 1(d) processed by EFOGV-PMD with , , and and iteration number is 3
(k) LDCT image in Figure 1(d) processed by EFOGV-PMD with , , and and iteration number is 8
(l) LDCT image in Figure 1(d) processed by EFOGV-PMD with , , and and iteration number is 15