[WM]: how we can measure the quality of a visible watermarked image

[nesrin yassin <eng_nesrin@yahoo.com>]

Hi all, 
 
glad to be a member in the group, i'm trying to make a visible watermarking technique but i cann't know how to measure the quality
of the visibly watermarked image. Also, what attacks can be applied? 
 
thank you
 
nesrin



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