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Prediction-error expansion (PEE) is an efficient technique for reversible data hiding (RDH). Instead of expanding the highest histogram bins in conventional PEE, in this paper, to better utilize the image redundancy, we propose a new PEE-based RDH scheme with an advisable expansion strategy utilizing referential prediction-errors. For each pixel, we first calculate its prediction-error and use its...
The automatic similarity measurement of source code can be applied to the detection of both plagiarism and code clone effectively. Suffix array is an effective way to construct the index of the full text, which has showed big applied potential in research areas such as genome analysis and character search currently. This paper introduces the relevant technologies of the similarity measurement of source...
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 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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