Research Article
[Retracted] Research on Digital Image Watermarking Algorithm Based on Scrambling and Singular Value Decomposition
Table 3
Contrast and entropy increment of images before and after enhancement.
| | Image | Initial digital image | Enhanced digital image | | Singular value | Contrast ratio | Singular value | Contrast ratio |
| | 1 | 5.55 | 1.07 | 5.97 | 1.24 | | 2 | 5.43 | 1.11 | 5.69 | 1.22 | | 3 | 5.35 | 1.14 | 5.93 | 1.24 | | 4 | 6.80 | 1.13 | 7.39 | 1.27 | | 5 | 6.81 | 1.10 | 7.42 | 1.27 | | 6 | 6.90 | 1.15 | 7.53 | 1.28 |
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