Abstract—In recent years, many digital watermarking techniques have been proposed to protect the copyright of digital multimedia data. This paper proposes a novel and robust algorithm of digital watermarking based on cellular automata transform (CAT). The idea of two-dimensional CAT is introduced in the algorithm. After the original image is disassembled by level-3 CAT, the watermark data is embedded into the two bands (LL3 and HH3) of the carrier image. Cellular automata have multiple gateway values, such as rule numbers, initial configuration, boundary condition. Using CAT algorithm, the robustness of the watermark as well as the imperceptibility will be strengthened. Experimental results show that the algorithm can resist some usual attacks such as compression, sharpening. This proposed method is robust to different attacks.
Index Terms—Digital watermarking, intentional attacks, two-dimensional CAT.
X. W. Li, J. S. Yun and S. T. Kim are with the Department of Information and Communications Engineering, Pukyong National University, 599-1, Busan, Republic of Korea (e-mail: email@example.com).
S. J. Cho is with the Department of Applied Mathematics, Pukyong National University, 599-1, Daeyeon 3-Dong, Nam-Gu, Busan, Republic of Korea.
Cite: Xiao-Wei Li, Jae-Sik Yun, Sung-Jin Cho, and Seok-Tae Kim, "Robust Digital Watermarking in CAT Two Bands," International Journal of Computer Theory and Engineering vol. 4, no. 6, pp. 907-910, 2012.