(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

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.