A Robust Zero-Watermark Copyright Protection Scheme Based on DWT and Image Normalization

  • Mahsa Shakeri
  • Mansour Jamzad
Part of the Lecture Notes in Computer Science book series (LNCS, volume 7088)


Recently, protecting the copyright of digital media has become an imperative issue due to the growing illegal reproduction and modification of digital media. A large number of digital watermarking algorithms have been proposed to protect the integrity and copyright of images. Traditional watermarking schemes protect image copyright by embedding a watermark in the spatial or frequency domain of an image. However, these methods degrade the quality of the original image in some extend. In recent years, a new approach called zero-watermarking algorithms is introduced. In these methods, the watermark does not require to be embedded into the protected image but is used to generate a verification map which is registered to a trusted authority for further protection. In this paper a robust copyright proving scheme based on discrete wavelet transform is proposed. It uses a normalization procedure to provide robustness against geometric distortions and a cellular automaton for noise robustness. Experimental results on images with different complexity demonstrate that our proposed scheme is robust against common geometric and non geometric attacks including blurring, JPEG compression, noise addition, sharpening, scaling, rotation, and cropping. In addition, our experimental results obtained on images with different complexities showed that our method could outperform the related methods in most cases.


Zero-watermarking copyright protection discrete wavelet transform image normalization cellular automata robustness 


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Copyright information

© Springer-Verlag Berlin Heidelberg 2011

Authors and Affiliations

  • Mahsa Shakeri
    • 1
  • Mansour Jamzad
    • 1
  1. 1.Computer Engineering DepartmentSharif University of TechnologyTehranIran

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