Print-and-scan model and the watermarking countermeasure

With multimedia developing rapidly, copyright protection and authentication is more and more important. Digital watermark is one of the most efficient methods to protect multimedia products. Print and scan attack is a challenging problem for most of digital watermarks. In this paper, the geometric distortion and halftone in print-and-scan process is analyzed for the sake of presenting a model of print-and-scan. A digital watermarking countermeasure is proposed. Experiment results verify the efficiency of the proposed watermarking countermeasure. The proposed work is promising in application of copyright protection and anti-forgery for paper media. q 2005 Elsevier B.V. All rights reserved.