Table 2: PSNR result of -threshold proposed scheme by prime .

Average

11 44.08 43.92 43.93 43.96 43.97
17 45.39 45.47 45.60 45.39 45.46
19 45.51 45.48 45.50 45.44 45.48
29 45.49 45.38 45.43 45.35 45.41
37 44.15 44.13 44.13 44.04 44.11
79 45.18 45.17 45.03 45.16 45.13
113 45.08 45.11 45.12 45.10 45.10
167 44.15 44.13 44.20 44.15 44.16
251 44.16 44.13 44.16 44.20 44.16