Table 2 PSNRs of watermarked images and lower limit images against original images.
From: Digital Watermarking Method Warranting the Lower Limit of Image Quality of Watermarked Images
| Â | Watermarked images | Lower limit images | ||||
|---|---|---|---|---|---|---|
| Â | MTF | JPEG75 | JPEG50 | MTF | JPEG75 | JPEG50 |
aerial | 34.9 | 37.5 | 35.8 | 26.1 | 28.3 | 26.9 |
airplane | 39.5 | 45.8 | 43.6 | 25.7 | 30.2 | 28.5 |
balloon | 43.6 | 48.9 | 46.8 | 32.9 | 34.9 | 33.3 |
couple | 42.0 | 47.5 | 44.0 | 29.6 | 34.1 | 32.6 |
earth | 41.0 | 48.0 | 44.6 | 31.4 | 33.7 | 32.0 |
girl | 42.0 | 46.8 | 45.0 | 28.3 | 32.7 | 31.5 |
lena | 42.2 | 45.1 | 44.2 | 26.6 | 32.4 | 30.6 |
mandrill | 32.4 | 39.0 | 37.8 | 21.9 | 27.2 | 25.4 |
milkdrop | 43.6 | 44.1 | 42.4 | 30.7 | 32.3 | 30.8 |
parrots | 40.0 | 48.3 | 46.5 | 26.0 | 34.3 | 31.6 |
pepper | 37.7 | 41.1 | 39.7 | 25.16 | 28.8 | 27.4 |
sailboat | 43.9 | 44.9 | 43.0 | 27.8 | 31.0 | 29.4 |