Wuhan University Journal of Natural Sciences

, Volume 11, Issue 6, pp 1675–1678 | Cite as

Chaos-based multipurpose image watermarking algorithm

  • Zhu Congxu
  • Liao Xuefeng
  • Li Zhihua
Information Hiding


To achieve the goal of image content authentication and copyright protection simultaneously, this paper presents a novel image dual watermarking method based on chaotic map. Firstly, the host image was split into many nonoverlapping small blocks, and the block-wise discrete cosine transform (DCT) is computed. Secondly, the robust watermarks, shuffled by the chaotic sequences, are embedded in the DC coefficients of blocks to achieve the goal of copyright protection. The semi-fragile watermarks, generated by chaotic map, are embedded in the AC coefficients of blocks to obtain the aim of image authentication. Both of them can be extracted without the original image. Simulation results demonstrate the effectiveness of our algorithm in terms of robustness and fragility.

Key words

copyright protection image authentication multipurpose watermarking chaos theory 

CLC number

TP 391.9 


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Copyright information

© Springer 2006

Authors and Affiliations

  1. 1.School of Information Science and EngineeringCentral South UniversityChangsha, HunanChina

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