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