METHOD OF DETECTING A WATERMARK IN DIGITAL IMAGES

摘要

A description is given of a method of detecting the presence of a watermark in a digital image, comprising the following steps: acquiring the digital image; obtaining from the digital image, by the application of a transform, a matrix of coefficients of a transform; selecting a group of said coefficients; determining a detection function (L) which is dependent on the watermark which is to be detected in said digital image; calculating the value of said detection function for the selected coefficients of said matrix of coefficients; determining whether or not the digital image includes said watermark according to the calculated value of said detection function (L).