Authors: Shiyan Hu
Addresses: Department of Electrical and Computer Engineering, Michigan Technological University, Houghton, MI, 49931, USA
Abstract: In this paper, a new document image watermarking method based on a secure partitioning scheme is proposed and tested. In the method, a document image is securely divided into weight-invariant partitions, followed by selectively modifying characters to embed watermarks. The high security of a watermark results from applying a probabilistic metaheuristic algorithm, namely the Ant Colony System (ACS), to approximate the involved Bottleneck Hamiltonian Path Problem to generate key-dependent image partitions. For better efficiency, the farthest point heuristic and the multi scale strategy are introduced into the ant colony system. Our experimental results demonstrate that the proposed watermarking scheme is secure, efficient, and robust to common attacks. The proposed secure partition scheme could serve as a general framework to introduce high security to prevailing watermarking techniques.
Keywords: image watermarking; document images; secure partitioning; ant colony optimisation; ACO; robustness; bottleneck Hamiltonian path; document security; image security; document watermarking.
International Journal of Information and Computer Security, 2010 Vol.4 No.1, pp.9 - 23
Published online: 26 Feb 2010 *Full-text access for editors Access for subscribers Purchase this article Comment on this article