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RE: [WM]: rotation attack?????
Yes, there are plenty of watermarking schemes that could survive against rotation attacks. The best solution is to reverse the
geometric transformation before extracting or detecting watermark in the test image.
For global transformations it might be easy to reverse, but for local transformations like RBA it is harder. The exhaustive search
scheme is, though effetcive, high time consuming. Recently we proposed a highly inexpensive technique to revrese the global
transformations with very high accuracy, accepted in IEEE ICIP 2006. This scheme along with an exhaustive serach scheme, where only
a few iterations is suffix, ensures maximum reversal efficiency.
>From: "larob02" <larob02@libero.it>
>To: <watermarking@watermarkingworld.org>
>Subject: [WM]: rotation attack?????
>Date: Thu, 1 Jun 2006 09:25:31 +0200
>
>with geometrical attacks in particular rotation attack, do watermark
>surv= ive?
>
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