[WM]: Question about QIM

[Eugene Kurbatov <e_kurbatov@yahoo.com>]

Hello all,
   
  I worked on SS watermarking before and now I try to understand QIM approach (using well-known Chen and Wornell's article). So I
have some questions about it.
   
  1) It seems to me, that QIM is really good technique in cases when there are no distortions, or these distortions are very little.
But if QIM undergoes some malicious attack, it can be destroyed easier than SS watermark. Is it right? Maybe you could give me link
to some articles where is described behaviour of QIM system under malicious attacks (or at least additive noise attack).
   
  2) Do you know any real QIM systems for images? Maybe you are already implemented it? All links to articles are welcome. If you
sent me source codes in MatLab or C, I would be very grateful.
   
  Many thanks in advance!
   
  Best regards, Evgeny Kurbatov.
  St-Petersburg State University of Telecommunications.



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