Engineering graphics copyright protection via CAT and reversi-ble state loop maximum length cellular automata

Xiaoyan Zhang, Shouxin Liu, Xiaowei Li, Jianzhong Li

Abstract: In recent years, digital watermarking has received increasing attention in the copyright protection of engineering graphics. The existing two-dimensional transform domain-based engineering graphic watermarking methods have low security and weak robustness, which greatly restrict their practical application. Research on such engineering graphics watermarking should be strengthened, and new algorithms should be developed to avoid these defects of previous watermarking methods, so as to achieve the purpose of copyright protection. This paper proposes an effective watermarking algorithm based on cellular automata transform (CA) transform and reversible state loop maximum length cellular automata (RSL-MLCA). Firstly, the engineering graphic is decomposed into CA frequency domain, and then the watermark is encrypted by RSL-MLCA and Fibonacci transform. Finally, the encrypted watermark information is embedded into the low frequency domain of the engineering graphic. To the best of our knowledge, this is the first time that CA has introduced for protecting engineering graphics copyright. Experimental results show that our CA-based watermarking algorithm can simultaneously improve the imperceptibility, robustness and security.