Re: [WM]: Discussion on Printed Paper watermarking

["MARY LYNNE HALLOT" <2370447@uwc.ac.za>]

Question to Voloshynovskiy
Could one use a devise that can embose certain words or letters on paper = when it is output on paper? Could this process work? It
did for typewriters= , the various machines could be traced as the letters were indented and = made their own individual brand of
mark on the copy, something like a = bullet when shot.

Mary-Lynne H'allot;
PhD Student; 
Computer Science Department;
University of the Western Cape
http://www.cs.uwc.ac.za/~charlie/
>>> Sviatoslav Voloshynovskiy <svolos@cui.unige.ch> 10/05/04 20:36 PM
>>> >>>
Hi,

........ several more comments to Miroslav email:

Watermarmarking of printed documents is a very important issue where a lot = of things depend on the requirements of a particular
application which defines:
- security requirements;
- printing/scanning resolution;
- halftoning/inverse halftoning technique (if you do not use continuous = tone printing that might be rather expensive for most of
applications);
- embedding rate;
- special tricks that avoid a possibility of copying or enabling self-authe= ntications and so on;
- key management protocol;
- complexity at the detector/decoder side;
- integration into printing process.

.......... so complex.....

If there are not special requirements, one might think just to use simple = bar (2D) codes for the same needs simplifying a lot of
practical problems and providing low-cost solution.

Regards,
Slava Voloshynovskiy


mgoljan@binghamton.edu wrote:

>IMHO, the important issue here is the cost. The second, well, it is the 
>cost again. The third, we can use math to prove that the digital watermark has desired properties.
>
>Miroslav Goljan, SUNY Binghamton
>
>
>  
>
>>Dear all,
>>If there is many of techniques to watermark paper using physical 
>>material such as holograms,.... and they are still exist in the
>>paper  even if the paper is damaged, why we try to find
>>watermarking  algorithm using digital techniques..even most of
>>theses are week after 
>>print scan....I would like to know your opinion about the
>>importance  of digital watermarking for print security over the physical methods.
>>Please reply to the the watermark group so we can listen to all 
>>opinion thanks
>>
>>
>>Khaled Walid Mahmoud
>>ZPU University
>>P.O.Box 2000
>>Zarka - 13110
>>Jordan
>>Email
>>        (work): k.w.mahmoud@zpu.edu.jo
>>        (Home):kwkmmsy@yahoo.com



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