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Advances, Systems and Applications

Table 5 Results of median filtering attacks

From: A robust encryption watermarking algorithm for medical images based on ridgelet-DCT and THM double chaos

Median Filter

[3, 3]

[5,5]

[7,7]

[9,9]

Repeat Times

1

10

20

1

10

20

1

10

20

1

10

20

PSNR

24.52

21.85

21.30

20.44

18.28

17.73

18.41

16.99

16.91

16.90

15.94

15.71

NC

1.00

1.00

1.00

1.00

1.00

1.00

1.00

1.00

1.00

1.00

1.00

1.00