Abstract
In this paper, we proposed a novel watermark scheme of copyright protection to obtain an acceptable image quality and to improve the capacity of data hiding. To achieve above goals, our proposed watermark scheme uses the saliency model of human visual system to decide the embedding positions of the host image for reducing the visual distortion. The watermark is embedded in the frequency domain for authentication and in the spatial domain for data hiding. We apply the game theory to obtain optimal quantization step size for each domain. By game theoretic analysis, we get Nash equilibrium as the best strategy for the quality of watermarked image and the robustness of the embedded watermark.