Mercurial > hg > wm
comparison Fotopoulos/README @ 0:be303a3f5ea8
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| author | Peter Meerwald <pmeerw@cosy.sbg.ac.at> |
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| date | Sun, 12 Aug 2007 13:14:34 +0200 |
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| 1 M.Barni, F. Bartolini, V. Cappellini, A. Piva. "A DCT-Domain | |
| 2 System for Robust Image Watermarking", | |
| 3 Signal Processing, vol.66, pp 357-372, 1998. | |
| 4 | |
| 5 V. Fotopoulos, A.N. Skodras, "A Subband DCT approach to | |
| 6 image watermarking", X European Signal Processing Conference, | |
| 7 September 4-8, 2000, Tampere, Finland | |
| 8 | |
| 9 parameters: | |
| 10 for starting coefficient reasonable values for the dct and hartley schemes | |
| 11 and this kind of dimensions is around 5000-20000, for the watermark length 10000-50000, | |
| 12 and seed/key should be in the range 1-1000 so that the output file of the testing module | |
| 13 gives a right similarity diagram | |
| 14 | |
| 15 for the subband dct version, things change corresponding to coefficients | |
| 16 because the bands' sizes are 1/4 of the original image's size. | |
| 17 starting coef should be between 3000-5000 and length 10000-20000 | |
| 18 for the alpha parameter i use 0.2 for all bands except LL for which i use | |
| 19 0.1 | |
| 20 | |
| 21 |