Research Article
Optical Image Encryption Using Devil’s Vortex Toroidal Lens in the Fresnel Transform Domain
| Image | Original image | Cipher image | Horizontal | Diagonal | Vertical | Horizontal | Diagonal | Vertical |
| Lena | 0.9562 | 0.9509 | 0.9817 | 0.0093 | 0.0121 | 0.0086 | OPT | 0.9497 | 0.9354 | 0.9695 | 0.0106 | 0.0020 | 0.0092 |
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