[WM]: Semi-Fragile watermarks

[Sergio Bravo Solorio <sbravo@lsc.fie.umich.mx>]

Hi watermarkers,

Semi-fragile watermarking schemes are designed to detect tampering, but also to survive certain unobtrusive attacks.  I've read lots
of papers regarding this topic, but no one provides robustness against similarity transformations. Why these distortions are not
considered as unobtrusive, even though they change neither the aspect ratio nor the angles of the images?. I think that slight
similarity transformations might be helpful in specific environments (e.g. medical).

Comments and references will be appreciated.

Best wishes!

Sergio
CaRpE DiEm


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