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A zero-watermark algorithm for 2D engineering graphic with real-mean is proposed. The graphicpsilas vertexes are used as characteristic parameters, and confusion and compare operations are done to them to obtain the characteristic sequence of the graphic, after that, the characteristic sequence is encrypted by logistic chaotic system. The mapping relationship between the two sequences is constructed...
A capacity variable watermarking algorithm for 2D engineering graphic based on complex number system is proposed. The coordinates of vertices in the engineering graphic are extracted to construct complex signals, which are transformed by Fourier transformation. The watermark sequence will be selected m bits each time to have a transformation under complex number base, then the real part and imaginary...
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