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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