Table 4 Correlation coefficients in all directions of Goldhill, Baboon, and Peppers.
From: A novel 4D chaotic system coupling with dual-memristors and application in image encryption
Images | Direction | Plain images | Ciphered image | |||
|---|---|---|---|---|---|---|
4D-DMCS | Ref.44 | Ref.60 | Ref.63 | |||
Goldhill | Horizontal | 0.9791 | 0.0389 | − 0.0231 | − 0.0115 | − 0.0171 |
Vertical | 0.9765 | − 0.0151 | 0.0138 | − 0.1290 | − 0.0009 | |
Diagonal | 0.9624 | 0.0380 | − 0.0002 | − 0.0031 | − 0.0094 | |
Reverse diagonal | 0.9623 | − 0.0108 | – | 0.0505 | – | |
Baboon | Horizontal | 0.7533 | 0.0080 | 0.006 | 0.174 | 0.0101 |
Vertical | 0.8686 | 0.0426 | − 0.0324 | − 0.0319 | − 0.0091 | |
Diagonal | 0.7301 | 0.0129 | − 0.0064 | 0.0236 | − 0.0046 | |
Reverse diagonal | 0.7019 | − 0.0092 | – | 0.0080 | – | |
Peppers | Horizontal | 0.9797 | − 0.0014 | 0.0081 | − 0.0112 | 0.0192 |
Vertical | 0.9764 | 0.0342 | − 0.0126 | 0.0017 | − 0.0025 | |
Diagonal | 0.9605 | 0.0047 | − 0.0097 | 0.0366 | 0.0294 | |
Reverse diagonal | 0.9699 | − 0.0085 | – | 0.0080 | – | |
