[WM]: region based watermarking question

[SIAMAK YOUSEFI <syousefy@yahoo.com>]

Dear members

I am MS student of electrical engineering.
I have worked on digital image watermarking more than a year. I started by pitas papers. By the way, I read papers, "robust
watermarking of facial images based on salient geometric pattern matching" and "region based image watermarking" by pitas and
nikolaidis several times.
but I couldn't underestand, how they compute the results of tables(FRR and FAR). in other way they embedd 100 different watermarks
in an image and then observe the detector output. after that they reach a table of FARs and FRRs that I couldn't underestand how
they obtain it. 
I didn't find the newest email of nikolaidis.
any help in finding new email or helping me about the problem is appreciated.

best regards,
yousefi 


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