Issue 16

F. R. Renzetti et alii, Frattura ed Integrità Strutturale, 16 (2011) 43-51; DOI: 10.3221/IGF-ESIS.16.05 48 The tables below the group of pictures show the minimum and maximum values obtained for each indicator with 8 to 64 shades of gray. Figure 11 : Duplex as received. Figure 12 : Energy 8 gray levels. Figure 13 : Energy 64 gray levels. Figure 14 : Entropy 8 gray levels. Figure 15 : Entropy 64 gray levels. Figure 16 : Mutual information 8 gray levels Figure 17 : Mutual information 64 gray levels. Figure 18 : Contrast 8 gray levels. Figure 19 : Contrast 64 gray levels. INDICATOR 8 gray levels 64 gray levels Min Max Min Max Energy 0,1843 0,8906 0,1667 0,8361 Entropy 0,7255 4,9477 1,0808 5,1699 Mutual Information -2,6769 -0,0048 -4,8366 -0,1350 Contrast 0 14,1111 1,8611 1,0020e+03 Table 1 : Minimum and maximum values assumed by the indicators.