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Advances in Multimedia
Volume 2016, Article ID 4901609, 17 pages
Research Article

A Novel Printable Watermarking Method in Dithering Halftone Images

Department of Computer Science, National Chiao Tung University Hsinchu, Hsinchu 300, Taiwan

Received 11 January 2016; Revised 5 April 2016; Accepted 3 May 2016

Academic Editor: Martin Reisslein

Copyright © 2016 Hui-Lung Lee and Ling-Hwei Chen. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Halftone images are commonly printed on books, newspapers, and magazines. How to protect the copyright of these printed halftone images becomes an important issue. Digital watermarking provides a solution for copyright protection. In this paper, we will propose a novel printable watermarking method for dithering halftone images. Based on downsampling and the property of a dispersed dithering screen, the method can resist cropping, tampering, and print-and-scan process attacks. In addition, comparing to Guo et al.’s method, the experimental results show that the proposed method provides higher robustness for the above-mentioned attacks and better visual quality in the high-frequency regions of halftone images.