Research Article
Application of Fractional Wave Packet Transform for Robust Watermarking of Mammograms
Table 2
Correlation coefficients of extracted watermarks (β = 1).
| Attack | mdb001 PSNR | Correlation coefficient | mdb017 PSNR | Correlation coefficient | mdb054 PSNR | Correlation coefficient | mdb153 PSNR | Correlation coefficient |
| No attack | 51.9226 | 0.99167 | 52.1666 | 0.9911 | 52.1268 | 0.9863 | 50.5253 | 0.9990 | Weiner | 47.4623 | 0.56504 | 47.8532 | 0.5728 | 50.1466 | 0.6754 | 44.2345 | 0.5348 | Median filtering | 34.8623 | 0.00565 | 35.5175 | 0.0301 | 36.9109 | 0.03534 | 22.6301 | 0.0155 | Salt and pepper noise | 26.7163 | 0.12153 | 46.1605 | 0.7378 | 26.4035 | 0.1157 | 27.3673 | 0.1713 | Cropping | 3.84305 | 0.09536 | 3.4014 | 0.0762 | 3.3462 | 0.0764 | 3.6300 | 0.100 | Compression | 43.4441 | 0.21957 | 44.0487 | 0.1998 | 46.1554 | 0.2317 | 41.5755 | 0.2856 | Rotation | 21.8898 | −0.0158 | 20.0117 | −0.0046 | 19.6339 | −0.0011 | 17.9435 | 0.0269 | Resizing | 49.4074 | 0.88312 | 47.210 | 0.8365 | 46.8850 | 0.8116 | 43.4394 | 0.8355 | Sharpening | 32.2288 | 0.46943 | 32.0762 | 0.4280 | 33.1590 | 0.4798 | 27.4106 | 0.4340 | Gaussian filter | 47.9443 | 0.81130 | 46.1605 | 0.7378 | 45.3153 | 0.7336 | 42.0658 | 0.7408 |
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