Table 3 Correlations between the original and the extracted watermarks under different attacks.
From: A Robust Image Watermarking in the Joint Time-Frequency Domain
Attack | Lena | Baboon | Boats | Barbara |
|---|---|---|---|---|
JPEG ( | 0.8909 | 0.8392 | 0.8414 | 0.8763 |
JPEG ( | 0.9422 | 0.8783 | 0.9148 | 0.8798 |
JPEG ( | 0.9480 | 0.8902 | 0.9133 | 0.9126 |
JPEG ( | 0.9384 | 0.8579 | 0.9132 | 0.9356 |
JPEG ( | 0.9543 | 0.8937 | 0.9114 | 0.9516 |
Rotation (5°) | 0.5481 | 0.4119 | 0.7071 | 0.5505 |
Rotation (10°) | 0.5041 | 0.7318 | 0.5672 | 0.6447 |
Rotation (15°) | 0.5184 | 0.6140 | 0.5045 | 0.5467 |
Rotation (20°) | 0.4918 | 0.3878 | 0.4159 | 0.6098 |
Rotation (25°) | 0.3894 | 0.4957 | 0.4903 | 0.5161 |
Cropping (10 column) | 0.9873 | 0.9488 | 0.9726 | 0.9612 |
Cropping (25 column) | 0.9845 | 0.9351 | 0.9698 | 0.9550 |
Cropping (50 column) | 0.9354 | 0.9215 | 0.9655 | 0.9293 |
Cropping (75 column) | 0.9556 | 0.9000 | 0.9622 | 0.9423 |
Cropping (100 column) | 0.9614 | 0.8787 | 0.9688 | 0.9382 |
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