[WM]: WM]: HELP...How to compare the robustness of 2 watermarking algorithms

["Srisuda LA" <la_srisuda@hotmail.com>]

HELLO... ALL Watermarker,

I'm new to this field.
I would like to compare the robustness of 2 watermarking algorithms, [1] and [2] using common signal processing. (JPEG, low-pass
filtering, median
filtering) I planning to use lena and pepper as the host images.
1. What do i need to do before attack watermarked images.?
2. Some parameters (e.g. watermark strength) have to scale in embedding process in order to obtain similar image quality, Right?
3. Do The watermarked images (lena and pepper) need to have similar image quality or same PSNR before attack.?


My References papers are:

[1]	I. J. Cox, J. Kilian, F.T.Leighton, and T. Shamoon, "Secure Spread 
Spectrum Watermarking for Multimedia," IEEE Trans. on Image Processing, vol.6, pp. 1673-1687, Jan. 1997.
[2]  M. Barni, F. Bartolini,V. Cappellini and A. Piva, "A DCT-domain for Robust Image Watermarking," IEEE.Signal Processing, vol.66,
pp. 357-372, June, 1998.

Help me please...

Best regards,
Srisuda-LA


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