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Research Article

Multipurpose Watermarking Algorithm for Medical Images

Table 2

Similarity of watermark extracted under various attacks.

Attack typesSimilarity of robust watermark (NC)
SkullMediastinumLiver
This paper[14][27][26][28]This paper[14][27][26][28]This paper[14][27][26][28]

No attack111111111111111
Gaussian filter (3  3  = 0.3)0.9560.9790.9710.9540.9770.9670.9440.9720.959
Median filter [3, 3]0.9420.9560.9870.8610.9830.9380.9510.9850.8560.9820.9260.9440.9820.8470.98
White noise (0.01)0.9610.9700.9580.9590.9690.9560.9510.9630.949
Salt and pepper noise (0.02)0.9570.9400.9490.9460.9420.9610.9420.9470.9440.9400.9520.9350.9420.9380.937
Shear (1/16)0.9210.8520.9350.9410.9200.8630.9310.9330.9060.8420.9200.922
JPEG compression Q = 200.9140.7430.9340.7550.9210.728
JPEG compression Q = 500.9550.8720.8220.8570.9520.8830.8200.8700.9430.8650.8090.854
Shrink 30%0.9820.9770.86110.9850.9780.85810.9760.9710.8571
Enlarge 30%0.9850.9710.85310.9880.9730.85510.9810.9680.8491
Rotate 30°C0.9830.8920.9750.9780.8880.9740.9720.8830.972
Rotate 45°C0.9760.9670.9640.9720.9650.9630.9700.9610.959

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