Research Article
Visually Meaningful Image Encryption Scheme Based on DWT and Schur Decomposition
Table 8
Colour images: the similarity test between different visual images and corresponding cover images.
| Plain image | Host image | Colour component | NC | H | Host image | Visual image |
| Boat () | Earth | R | 0.9998 | 6.5724 | 6.5899 | G | 0.9996 | 7.4512 | 7.4617 | B | 0.9998 | 6.7626 | 6.7726 | Mean | 0.9997 | 6.9287 | 6.9414 | Sun | R | 0.9999 | 7.2018 | 7.2371 | G | 0.9999 | 7.2732 | 7.2917 | B | 0.9999 | 7.4110 | 7.4344 | Mean | 0.9999 | 7.2983 | 7.3211 |
| Tulips () | Earth | R | 0.9998 | 6.5724 | 6.5889 | G | 0.9996 | 7.4512 | 7.4619 | B | 0.9998 | 6.7626 | 6.7736 | Mean | 0.9997 | 6.9287 | 6.9415 | Sun | R | 0.9999 | 7.2018 | 7.2384 | G | 0.9999 | 7.2732 | 7.2927 | B | 0.9999 | 7.4110 | 7.4344 | Mean | 0.9999 | 7.2983 | 7.3218 |
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