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Publication details
Authors M.BarniF.BartoliniV.CappelliniA.Piva
Title Copyright protection of digital images by embedded unperceivable marks
Abstract Digital watermarking has been proposed as a solution to the problem of copyright protection of multimedia documents in a networked environment. It makes possible to tightly associate a code to an image, allowing the identification of the data creator, owner and so on. In this paper, after a review of some important watermarking techniques, a new watermarking algorithm for digital images is presented: the method, which enhances a previous technique proposed by Cox et al., operates in the frequency domain, by embedding in a selected set of DCT coefficients a sequence of randomly generated real numbers. By exploiting their statistical characteristics, it is possible to reliably extract the embedded sequences without resorting to the original unmarked image. Experimental results demonstrate that the watermark is robust to several image transformations.
Publication Image & Vision Computing
Typology International Journal Papers
Date August 1998
Other info vol. 16, no. 12-13, pp. 897-906, 
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