Research Article
Blind Image Watermarking Based on Adaptive Data Spreading in n-Level DWT Subbands
Table 6
Performance comparison with [
16] with NCC value.
| | Attack | Proposed | [16] |
| | Average PSNR [dB] | 43.6 | 44.08 |
| | Scaling to 2 | 1.0000 | 1.0000 |
| | Scaling to 0.8 | 1.0000 | 1.0000 |
| | Scaling to 0.5 | 1.0000 | 0.9911 |
| | Scaling to 0.25 | 0.5884 | 0.6996 |
| | Cropping 25% | 0.9219 | 0.8965 |
| | Right rotation 90° | 1.0000 | 1.0000 |
| | Right rotation 60° | 0.9565 | 1.0000 |
| | Right rotation 45° | 0.9673 | 0.9978 |
| | Right rotation 30° | 0.9628 | 1.0000 |
| | Average robustness | 0.9330 | 0.9539 |
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