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Table 2 Detailed statistical results of different operations

From: Robust image hashing with compressed sensing and ordinal measures

Operation

Maximum

Minimum

Mean

Standard deviation

Brightness adjustment

64.76

4.24

20.18

10.53

Contrast adjustment

36.74

3.74

14.23

6.12

Gamma correction

62.08

7.62

22.92

10.07

3 × 3 Gaussian low-pass filtering

36.47

0

14.96

7.90

Speckle noise

57.97

6.16

18.88

9.21

Salt and pepper noise

47.14

3.46

18.30

8.35

JPEG compression

59.32

7.35

21.28

9.19

Watermark embedding

60.66

3.74

17.77

9.81

Image scaling

59.11

9.80

24.42

9.62

Rotation, cropping, and rescaling

145.70

21.82

65.74

24.06