Re: [WM]: how many bits we should embed in an applicable watermarking system?

["Jeffrey Bloom" <jbloom@sarnoff.com>]

Depends on the application and what message you want to encode.  For generational copy control, 2 bits is sufficient in 10 seconds
of video.  For authentication, the number of bits depends on the size of the digital signature.  For tracking, you need the log of
the number of copies you intend to track plus a significant buffer of bits to accommodate ECC and perhaps ACC.  For labeling, you
might embed a data record identifier and then use that identifier to look up a ton of info in a database (like Digimarc does), or
you might want to embed the ton of info directly into the work.

At 04:16 AM 5/19/2005, water sun wrote:
>Hi,all
>i was told that the watermarking system which can only embedding 15bits 
>is useless. Is that right?
>Thank you!

=============================
Dr. Jeffrey A Bloom, Sarnoff Corporation, 201 Washington Road, CN 5300, Princeton, NJ 08543-5300 jbloom@sarnoff.com,
http://www.geocities.com/Jeffrey_Bloom, (609) 734-3287,
(609) 734-2662 fax


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