Research Article
Visually Meaningful Image Encryption Scheme Based on DWT and Schur Decomposition
Table 12
NPCR and UACI tests (average).
| Image | Size | NPCR | UACI | Max | Min | Mean | Max | Min | Mean |
| Cameraman | 256×256 | 99.6323 | 99.5804 | 99.6046 | 33.6808 | 33.2814 | 33.4338 | Tree | 256×256 | 99.6811 | 99.5514 | 99.6181 | 33.5978 | 33.3407 | 33.4933 | Boat | 256×256 | 99.6582 | 99.5682 | 99.6159 | 33.6314 | 33.4374 | 33.5430 | Lena | 512×512 | 99.6235 | 99.5991 | 99.6091 | 33.5194 | 33.4315 | 33.4732 | Bridge | 512×512 | 99.6204 | 99.5861 | 99.6073 | 33.5254 | 33.4237 | 33.4702 | Couple | 512×512 | 99.6315 | 99.5983 | 99.6150 | 33.5519 | 33.4054 | 33.4657 | Boat | 512×512 | 99.6300 | 99.6078 | 99.6175 | 33.5882 | 33.3520 | 33.4643 |
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