Research Article
Blind Image Watermarking Based on Adaptive Data Spreading in n-Level DWT Subbands
Table 5
Performance comparison with [
17] with NCC value.
| Attack | Proposed | [17] |
| Average PSNR [dB] | 40.80 | 40.19 |
| JPEG quality 80 | 1.0000 | 1.0000 |
| JPEG quality 60 | 0.9932 | 1.0000 |
| JPEG quality 40 | 0.8945 | 0.9953 |
| Gaussian Noise 1 | 1.0000 | 0.9531 |
| Gaussian Noise 2 | 1.0000 | 0.8707 |
| Salt & Pepper Noise | 0.9915 | 0.7987 |
| Median Filtering 33 | 0.9627 | 0.9254 |
| Median Filtering 55 | 0.7537 | 0.6992 |
| Median Filtering 77 | 0.5554 | 0.4755 |
| Average Filtering 33 | 0.9698 | 0.8432 |
| Average Filtering 55 | 0.7255 | 0.6463 |
| Gaussian Filtering 33 | 0.9960 | 0.9833 |
| Sharpening | 1.0000 | 0.8878 |
| Histogram Equalization | 0.5886 | 0.8278 |
| Scaling to 1.8 | 1.0000 | 0.6442 |
| Scaling to 1.5 | 1.0000 | 0.8736 |
| Cropping 25% | 0.9895 | 0.9298 |
| Rotation 0.1° | 0.9652 | 0.7461 |
| Rotation 0.2° | 0.9652 | 0.3761 |
| Average robustness | 0.9132 | 0.8145 |
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