Research Article
Color Zero-Watermarking Algorithm for Medical Images Based on BEMD-Schur Decomposition and Color Visual Cryptography
Table 8
NC values under geometric cropping attacks.
| | Attack type | Attack strength | Fundus1 | Fundus2 | Fundus3 | Fundus4 | Cerebral1 | Cerebral2 | Cerebral3 | Cerebral4 |
| | Cropping | 1/16 | 0.9990 | 0.9992 | 0.9992 | 0.9991 | 1.0000 | 1.0000 | 1.0000 | 1.0000 | | 1/8 | 0.9962 | 0.9963 | 0.9963 | 0.9965 | 1.0000 | 1.0000 | 1.0000 | 1.0000 | | 1/4 | 0.9878 | 0.9880 | 0.9879 | 0.9873 | 0.9998 | 0.9999 | 0.9999 | 0.9998 |
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