Research Article
A Novel Printable Watermarking Method in Dithering Halftone Images
Table 6
Quality comparisons of three different kinds of pair selections using Pei-Guo-PSNR [
12] and scores
and
[
14].
| Selection | The 1st selection used in Guo et al. [12] with | The 2nd selection used in the proposed method with | The 3rd selection with | Images | Quality | Pei-Guo-PSNR | | | Pei-Guo-PSNR | | | Pei-Guo-PSNR | | |
| Lena | 30.78 | 1.37 | 480 | 29.24 | 1.06 | 204 | 28.26 | 2.26 | 12967 | Mandrill | 27.30 | 2.24 | 3201 | 27.32 | 1.59 | 2758 | 26.54 | 2.36 | 16866 | Earth | 27.06 | 2.07 | 2772 | 28.17 | 1.28 | 1233 | 28.45 | 2.09 | 6841 | Tiffany | 31.06 | 1.12 | 189 | 29.06 | 1.03 | 159 | 28.82 | 1.70 | 1981 | Shuttle | 27.66 | 1.90 | 2134 | 28.08 | 1.20 | 871 | 28.12 | 2.18 | 10062 | Peppers | 30.34 | 1.46 | 755 | 29.00 | 1.08 | 381 | 28.25 | 2.18 | 10525 | Milk | 31.04 | 1.32 | 529 | 29.63 | 1.02 | 129 | 28.65 | 2.17 | 10080 | Lake | 28.15 | 1.88 | 1967 | 28.15 | 1.13 | 857 | 28.34 | 1.95 | 5753 |
| Average | 29.17 | 1.67 | 1503.4 | 28.58 | 1.17 | 824 | 28.18 | 2.11 | 9384.4 |
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