Steganography in Halftone Images - Visual Cryptography and Secret Image Sharing - page 370

300

Y1
Y2

250

200

150

100

50

0

0 50 100 150 200 250 300

R w a i y of X

FIGURE 13.28
Row-wise average intensity Y 1 in Figure 13.4 and Y 2 in Figure 13.23 vs row-
wise average intensity of X in Figure 13.14 (Ramp).

300

DHSED theoretical value
DHCED theoretical value

250

200

150

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50

0

0 50 100 150 200 250 300

R w- w a i y of X

FIGURE 13.29
Theoretical average local intensity of W b in Y for DHSED and DHCED vs
row-wise average intensity of X in Figure 13.14 (Ramp).