Re: [WM]: why use DCT?? (urgent)

[Martin Dietze <di@fh-wedel.de>]

On Sun, April 17, 2005, rajan sheth wrote:

> i im implementing visible watermarking using DCT (for color images) 
> and invisible watermarking also using DCT (for grayscale images).
> 
> but i dont know whether DCT have any advantage over other 
> transforms.(especially DWT)

Sorry for asking this question: if you don't know why anyone should use the DCT, why are you then implementing it? I guess you
should study the advantages and disadvantages of different embedding domains before you make a choice.

> can any one tell me why i should use DCT transform over other transforms??

There's much more to say about this than what could be answered in a mailing list posting. Also a lot has already been posted here
regarding this subject.  I suggest you use google to look for relevant papers and check the mailing list archieves for postings on
this subject. 

I don't believe that what anyone could tell you here in a posting to this mailing list list would be enough to base a decision on or
justify it when starting a new project on watermarking.

Cheers,

Martin

--
---- Dipl.Ing. Martin Dietze -- / --- martin.dietze@4g-systems.biz ----------
-- 4G Systeme GmbH Hamburg --- / --- martin@the-little-red-haired-girl.org --


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