Table 4 Correlation coefficients in neighboring pixels before and after hashing the images.
From: A new digital watermarking model using honey encryption and reversible cellular automata
Before hashing | After hashing | Correlation coefficient | Image |
|---|---|---|---|
0.8589 | 0.0485 | Horizontal | Mandrill |
0.8177 | 0.0142 | Vertical | |
0.7393 | 0.0756 | Diagonal | |
0.8415 | 0.0233 | Horizontal | Boat |
0.8113 | 0.0185 | Vertical | |
0.7019 | 0.0218 | Diagonal | |
0.8710 | 0.0279 | Horizontal | Home |
0.7967 | 0.0126 | Vertical | |
0.7281 | 0.0042 | Diagonal | |
0.8211 | 0.0015 | Horizontal | Average |
0.7925 | 0.0176 | Vertical | |
0.8344 | 0.0052 | Diagonal |
