Research Article
Improved Chaos-Based Cryptosystem for Medical Image Encryption and Decryption
Table 5
Global and local Shannon entropy values of encrypted images.
| | Image | Local Shannon entropy | Global Shannon entropy | | Red | Blue | Green | Red | Blue | Green |
| | Lena | 7.9548 | 7.9546 | 7.9542 | 7.9998 | 7.9998 | 7.9997 | | Peppers | 7.9546 | 7.9549 | 7.9544 | 7.9998 | 7.9997 | 7.9997 | | Baboon | 7.9554 | 7.9557 | 7.9553 | 7.9998 | 7.9998 | 7.9998 | | 3D ultrasound | 7.9557 | 7.9552 | 7.9548 | 8.0000 | 8.0000 | 8.0000 | | 3D ankle | 7.9563 | 7.9559 | 7.9559 | 8.0000 | 8.0000 | 8.0000 | | 3D X-ray | 7.9568 | 7.9563 | 7.9564 | 8.0000 | 8.0000 | 8.0000 | | 3D radiography | 7.9562 | 7.9563 | 7.9560 | 8.0000 | 8.0000 | 8.0000 | | 3D CT-scan | 7.9567 | 7.9567 | 7.9565 | 8.0000 | 8.0000 | 8.0000 | | 1D ultrasound | 7.9556 | 8.0000 | | MRI | 7.9553 | 7.99998 | | Endoscopy | 7.9549 | 7.99998 |
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