[WM]: Video frame collusion attack

[Jochen Schneider <schneider@dice.ucl.ac.be>]

Hi,

I am evaluating watermarking algorithms for videos. One of them embeds =
the same watermark (with a strength depending on the
respective image) in every frame. (The watermark has the form of white =
Gaussian noise.) It is therefore vulnerable to a collusion
attack, using the frames of the movie itself. What I don't know is how =
to actually do the attack. I guess you have to start by
averaging the frames, but then what? I read the thesis by Su and an =
article by Do=EBrr and Dugelay, but they are more concerned with
preventing such an attack than the details of the attack itself. Can =
anybody give me a hint on where I can find more information?

Thanks,

	Jochen




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