The present invention is a digital watermarking technique Phasemark™ for image authentication. Using a signature extracted from the original image, the present invention hides an encoded version of the signature back into the original image, forming the watermarked image. The hiding is done in the...http://www.google.fr/patents/US7313250?utm_source=gb-gplus-shareBrevet US7313250 - Method and system for frequency domain watermarking using a phase based filter signature
Method and system for frequency domain watermarking using a phase based ...
