Table 7 PSNR and SSIM of watermarked images, the NC of watermarks.

From: An improved reversible watermarking scheme using embedding optimization and quaternion moments

Attacks

256 × 256

128 × 128

Attacks

256 × 256

128 × 128

Wiener filter attacks

NC = 0.9995

NC = 0.9990

Motion blur

NC = 0.8945

NC = 0.8346

SSIM = 0.9945

SSIM = 0.9952

SSIM = 0.9954

SSIM = 0.9961

PSNR = 54.53

PSNR = 46.73

PSNR = 0.4367

PSNR = 48.53

Median filter

NC = 0.9978

NC = 0.9968

Rescaling 0.25

NC = 97.45

NC = 0.8543

SSIM = 0.9976

SSIM = 0.9980

SSIM = 0.9953

SSIM = 0.9967

PSNR = 51.63

PSNR = 56.29

PSNR = 51.61

PSNR = 53.63

Gaussian filter

NC = 0.9940

NC = 0.9966

Rotation

NC = 0.9963

NC = 0.9935

SSIM = 0.9974

SSIM = 0.9991

SSIM = 0.9934

SSIM = 0.9924

PSNR = 51.93

PSNR = 56.47

PSNR = 42.32

PSNR = 46.63

Average filter

NC = 0.9999

NC = 0.9999

JPEG compression

NC = 0.9999

NC = 0.9995

SSIM = 0.9964

SSIM = 0.9970

SSIM = 0.9941

SSIM = 0.9959

PSNR = 49.36

PSNR = 50.56

PSNR = 53.67

PSNR = 57.49

Salt and pepper noise

NC = 0.9934

NC = 0.9921

JPEG 2000 compression

NC = 0.9998

NC = 0.9984

SSIM = 0.9958

SSIM = 0.9962

SSIM = 0.9986

SSIM = 0.9932

PSNR = 49.63

PSNR = 50.73

PSNR = 43.24

PSNR = 48.73

Gaussian noise

NC = 0.9748

NC = 0.9895

HE

NC = 68.59

NC = 0.6841

SSIM = 0.9935

SSIM = 0.9956

SSIM = 0.8675

SSIM = 0.8731

PSNR = 48.63

PSNR = 56.70

PSNR = 16.23

PSNR = 17.35

Speckle noise

NC = 0.9746

NC = 0.9676

Sharpening

NC = 0.9998

NC = 0.9975

SSIM = 0.9963

SSIM = 0.9972

SSIM = 0.9982

SSIM = 0.9985

PSNR = 39.43

PSNR = 40.69

PSNR = 53.76

PSNR = 54.35

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