Research Article
Visually Meaningful Image Encryption Scheme Based on DWT and Schur Decomposition
Table 5
Comparisons of the variance value.
| | Algorithms | Images | Sizes | Plain images | Encrypted image |
| | Ours | Tree | 256 × 256 | 66009.679 | 248.8125 | | Cameraman | 256 × 256 | 110973.304 | 228.5859 | | Boat | 512 × 512 | 1583351.602 | 1016.523 | | Lena | 512 × 512 | 632097.477 | 915.6719 | | Couple | 512 × 512 | 1387095.813 | 1028.398 |
| | Reference [32] | Tree | 256 × 256 | 66010 | 259.9297 | | Cameraman | 256 × 256 | 110970 | 250.4141 | | Lena | 512 × 512 | 633400 | 1077.3 |
| | Reference [33] | Boat | 512 × 512 | 1535900 | 1044.9 | | Lena | 512 × 512 | 633400 | 982.5703 | | Couple | 512 × 512 | 1195500 | 967.3047 |
| | Reference [34] | Boat | 512 × 512 | 1535878.750 | 1035.125 | | Couple | 512 × 512 | 1195460.976 | 1104.265 |
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