Re: Re: [WM]: Could anyone tell me the difference between image =

["Frank Ling" <lhefei@163.com>]

	watermarking and video watermarking in terms of robustness against =
geometric attacks
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I am glad to discuss with you.
I think the 2 additional requirements you mentioned may be solved by the =
following methods:
1)the watermark bits are embedded only in each frame, ignoring the =
time-axis redundance.
2)the embedded watermark must be adjusted according to the content of =
frames. An easy method is dividing the watermark into several
sub-watermark, each sub-watermark is embedded in frames randomly or with =
a predefined rule.

In addition, I care for the real-time property of video watermarking. As =
we know, the methods of image watermarking robus t against
geometric attacks often have high computational complexity, I wonder =
which of the existed methods for resisting to geometric attacks
has a relative lower computational complexity.

TIA

Frank Ling

=09

=3D=3D=3D=3D=3D=3D=3D 2005-01-19 18:45:33 =3D=3D=3D=3D=3D=3D=3D

>There are 2 additional issues: 1) need to synchronize in time and 2)
>need to be robu) need to synchronize in time and 2)
>st to "collusion" attacks (collusion in the sense of
>averaging across multiple frames, cf recent IEEE papers by Kundur et
>al). The second requirement precludes trying dur et
>to synchronize blind
>using techniques developed for image watermarking which involve using
>a fixed template.
>
>I am working in this field and would be happy to converse if you are
>interested in future discussions.
>
>Cheers
>
>John
>
>
>On Wed, 19 Jan 2005 16:08:25 +08ers
>
>00, Frank Ling <lhefei@163.com> wrote:
>>  I am interest Frank Ling <lhefei@163.com> wrote:
>>ed in video watermarking. one of the challenged problems is robust =
against geometric attacks. I know there are many
>> papers focusing the research of image watermarking robust against =
geometric attacks. I don't know if there are some specific
>> requirements for video watermarking, and if the methods to resist to =
geometric attacks in image watermarking can be directly
>> employed  in video watermarking. TIA
>>=20
>> ________________________________marking. TIA
>>=20
				=20
=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1Frank Ling
=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1lhefei@163.com
=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A12005-01-19


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