In view of the distributing feature of DWT (Discrete Wavelet Transform) coefficients , an watermark algorithm based on DWT and Chaos mapping is represented. The watermark image is first transformed by Logistic mapping to an unmeaning image in the field, and the positions of embedding the secret image are obtained by exploiting the characteristics of the human visual system (HVS). Detecting procedure doesn't need original host image. The experiment results show that the algorithm has good invisibility, robustness and security to the watermark.
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