Re: [WM]: Discussion on Printed Paper watermarking

[Sviatoslav Voloshynovskiy <svolos@cui.unige.ch>]

...... indeed text/character marking is another possibility.
The main challenge is that the text mark stays always with data in any form of conversion:
digital->digital (not necessary of the same format)  analog
analog-> digital
There are currently several existing technologies to achieve this goal.
At our side (University of Geneva), we have a technology (licensed to Anteleon Imaging  http://www.anteleon.com) that can embed
relatively large payload into Word/Latex documents with possible decoding in Word directly, or after conversion to .pdf or .ps. or
after printing and scanning.
The applications are various and one of them includes the authentication of the printing/reproduction device (mentioned in the
previous email).

Regards,
Slava

MARY LYNNE HALLOT wrote:

>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-authentications 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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