Table 5 The correlation coefficients of grayscale images.
From: An image encryption scheme based on public key cryptosystem and quantum logistic map
Image | Plain image | Encrypted image | ||||
|---|---|---|---|---|---|---|
Horizontal | Vertical | Diagonal | Horizontal | Vertical | Diagonal | |
Grass | 0.8129 | 0.7220 | 0.6439 | 0.0026 | \(-\) 0.0016 | 0.0047 |
Tree | 0.9591 | 0.9667 | 0.9495 | \(-\) 0.0073 | 0.0094 | 0.0107 |
Pentagon | 0.8567 | 0.8616 | 0.7960 | 0.0084 | 0.0026 | 0.0068 |
Art | 0.9890 | 0.9914 | 0.9833 | 0.0112 | 0.0081 | 0.0035 |
