Research Article
Combining Haar Wavelet and Karhunen Loeve Transforms for Medical Images Watermarking
Table 2
Evaluation of the algorithm against filters attacks.
| | Filter's window size | Median filter | Low pass filter | Wiener filter | | PSNR (dB) | WPSNR (dB) | NC | PSNR (dB) | WPSNR (dB) | NC | PSNR (dB) | WPSNR (dB) | NC |
| | 3 × 3 | 45.9121 | 57.1649 | 1.0000 | 35.5290 | 46.4338 | 1.0000 | 35.1327 | 49.0685 | 1.0000 | | 5 × 5 | 41.5136 | 50.0277 | 1.0000 | 32.5677 | 40.7808 | 1.0000 | 31.5552 | 41.9205 | 1.0000 | | 7 × 7 | 38.3304 | 45.4194 | 1.0000 | 30.6348 | 37.6424 | 1.0000 | 29.4059 | 37.8203 | 1.0000 | | 9 × 9 | 36.1094 | 42.5076 | 1.0000 | 29.2368 | 35.6657 | 1.0000 | 27.8707 | 35.2772 | 1.0000 |
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