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Re: [WM]: MPEG Reencoding
On Tue, Aug 02, 2005 at 04:23:44PM +0800, matthias hub wrote:
> Dear watermarkers,
>
> My question is, if someone has found a paper about this topic of
> "Reencoding impact to MPEG videos". I know, that is very special for
> every encoder, but maybe there are some results. I think this attack is slightly different from the JPEG compression attack,
because different parameters than the compression ratio have been altered. So the question is maybe the "Similiariy of DCT blocks"
> or, more general, the "Similiarity of FFT functions" in presence of
> similar visual perception. A visual model is usally not applicable that easy, because of a different value of the dc coefficient
and the prediction frames.
>
Dear Matthias,
You might be interested in work that BBC Research and Development department did. There was a project called ATLANTIC. One of its
primary concerns was the effect of re-encoding. Go to bbc.co.uk/atlantic. You will find that many of the publications there are
about avoiding re-encoding, but I hope that there will be something that will at least give you more insight into the problem.
Yours faithfully,
Andrew Mason
--
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Andrew Mason
BBC Research and Development Department, UK
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