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An encryption algorithm is proposed for 2D engineering graphics' content based on Logistic mapping and Tent mapping. The vertices' coordinates are extracted from 2D engineering graphic at first, then they are confused according to the order of chaos sequences, which are generated by chaos systems. After that, the vertices' coordinates are replaced by multiplying the chaos sequences with a XOR value,...
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...
A multiple encryption algorithm is proposed for 2D engineering graphic based on Fourier descriptors and chaos scrambling. The specific coordinates of vertices in the 2D engineering graphic are extracted to construct the corresponded complex signals, which are in turn transformed by Fourier transformation, then bit XOR operation is used between the FFT magnitude coefficients and a binary sequence,...
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