Re: [WM]: Blind vs Non-Blind

["Zou Xiaoxiang" <xxzou@ict.ac.cn>]

hanene£º
   Let's answer the first question.
   I think whether the scheme is the best is depend on what you need.
Blind watermark means detect without the original image( or video,
audio,...), and non blind means the original image is needed in
watermark detect. For example, Cox[1]'s scheme in non blind and
Hartung[2]'s scheme is blind. Both of them are based
on spread spectrum. The first scheme is more robust than the
second one, but the second one need not original video, so it
is more useful than the first one in most application.


[1]	I. J. Cox, Joe Kilian, F. Thomson Leighton, Talal Shamoon.  Secure
spread spectrum watermarking for multimedia. IEEE  Transactions on Image
Processing, 1997, Vol. 6(12), December:  1673-1687.

[2]	Frank Hartung, Bernd Girod. Watermarking of uncompressed
and compressed video. Signal Processing, Special issue on copyright
protection and access control for multimedia services,
May 1998, Vol. 66, No. 3, 283-301.


	

>I have some questions please.
>first, what's the best detection scheme: is'it the blind or the non
>blind one ? and why? secondly, has anyone of you source code in matlab
>of image watermarking in the DCT field. and by the LSB lethod. Thanks
>in advance
>


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