Research Article
Reversible Watermarking Using Prediction-Error Expansion and Extreme Learning Machine
Table 1
Comparison between Coltuc’s and proposed schemes for three classical images.
| Method | Image | Average improvement (dB) | Coltuc’s | Proposed |
| MED | Lena | 0.39 | 0.47 | Jet | 0.67 | 0.41 | Mandrill | 0.55 | 0.61 |
| GAP | Lena | 0.15 | 0.45 | Jet | 0.22 | 0.28 | Mandrill | 0.15 | 0.30 |
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