Research Article
Host Feasibility Investigation to Improve Robustness in Hybrid DWT+SVD Based Image Watermarking Schemes
Table 3
Average of NC for “S” coefficients in first and second level of SVD for 18 images 256
256.
| Attacks | Gaussian 0.01 | Gamma correction 0.1 | AVG filter 33 | Crop 1/4 | S&P 0.01 | Scaling 1/2 | Speckle 0.01 | Median 33 | Rot 50 |
| | 0.9968 | 0.9980 | 0.9866 | 0.9976 | 0.9868 | 1 | 0.9867 | 0.9865 | 0.9871 | | 0.9646 | 0.9878 | 0.9569 | 0.9952 | 0.9668 | 0.9994 | 0.9644 | 0.9580 | 0.9804 |
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