Re: [WM]: About SVD-based digital image watermarking

[Teddy Furon <teddy.furon@irisa.fr>]

My feelings about this scheme and also the Tzeng scheme is that the secret key used at the detection side is deeply dependent on the
host image.
whereas, usually in watermarking, the secret key is picked up randomly and especially independently of the host image and the
message to be hidden.

These two schemes do not respect this.

In the Tzeng algorithm for instance, the detector is more sensitive to the similarity between the suspicious image and host image
than to the actual presence of the watermark.
Therefore, the detector considers the host image as watermarked!

A typical default coming from a secret key build upon the host.

I do not say this is bad for copyright protection, but for me, this is looks like more content based retrieval than watermarking.

Teddy

On 21 mars 07, at 14:10, =3D?gb2312?q?=3DD5=3DC5=3D20=3DD2=3DB6?=3D
wrote:

> Dear all,
>
> What do you think of the = watermarking algorithm for digital images 
> based on singular value decomposition?
>
> Tan = and Liu proposed an SVD-based watermarking algorithm in "An 
> SVD-Based Watermarking Scheme for Protecting Rightful Ownership,"
> IEEE = Trans.
> Multimedia., vol. 4,no. 1,pp.121-128,Mar.2002.
>
> But this algorithm = is demonstrated fundamentlly flawed by Xiao- Ping 
> Zhang and Kan Li in ''Comments on 'An SVD-Based Watermarking = Scheme 
> for Protecting Rightful Ownership' ", IEEE Transactions on Multimedia 
> , Vol. 7,No. 2,April ,2005.
>
> =
> How to improve the flawed algorithm?
>
> Thank you!
>
> =  
> =D1=C5=BB=A2=C3=E2=B7=D1=D3=CA=CF=E4-3.5G=C8=DD=C1=BF=A3=AC20M=B8=BD=B 
> C=FE=



______________________________________________________________________________

Watermarking Mailing List - http://www.watermarkingworld.org/ml.html
To unsubscribe send email to "majordomo@watermarkingworld.org" with
"unsubscribe watermarking YOURMAIL" in the body.
______________________________________________________________________________