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The analysis of watermarking capacity of packing model and bits replacement model

Multimedia informational security problems including copyrights piracy emerge as the development of network technology. Studying the analyses of watermarking capacity becomes a hot point. Technologies of digital watermarking model are researched in this paper. Some analytical methods of digital watermarking capacity are discussed. The analyses of digital watermarking capacity can balance imperceptibility and robustness of digital watermarking. In view of the fact that watermarking model is based on probability statistic, a packing watermarking model is introduced in this paper. Some aspects of the packing watermarking model are discussed in this paper, such as watermarking capacity and imperceptibility. Details of packing watermarking model in this orthogonal transformation are described. Watermarking capacity, peak signal to noise ratio and the quantified relations between them are derived in this model. Bits replacement watermarking model is also introduced. In addition, game competition model is introduced in bits replacement watermarking model. Through the capacity equation in bits replacement watermarking model is nonlinear, the lower and upper bound of capacity in the watermarking model are derived in this paper, which can be used to evaluate actual capacity. If special carrier is given, embedding distortion and attack distortion is used to evaluate watermarking capacity and imperceptibility, which is more useful compared to traditional watermarking models. The simulation results of capacity in bits replacement watermarking model show some useful conclusions. For example, there is mutual relation between imperceptibility and security performance in digital watermarking.