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Table 4 Average value of r and radius R under rotation attack

From: Adaptive reversible image watermarking algorithm based on IWT and level set

Attack types a b c d
Original image 79.46 82.57 73.52 70.61
Rotate 10° 79.16 82.32 74.03 70.34
Rotate 30° 78.83 82.81 73.14 70.89
Rotate 45° 78.69 81.65 73.61 70.15
Rotate 60° 80.27 81.97 72.88 69.87
Shear 10% 79.62 82.12 73.44 71.27
Shear 20% 80.11 81.59 72.73 70.29
Radius R 80 80 70 70