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In this paper, a novel image steganographic method with four pixel-value-differencing and multiple-base notational is proposed. It processes non-overlapping 2 × 2 pixels blocks, and the features of edge can be considered sufficiently. Secret data, dynamically expressed as different digits in multiple-base, are embedded into each four-pixel block by adaptively applying exploiting modification direction...
This paper considers the problem of modelling the topics in a sequence of images with known time stamp. Detecting and tracking of temporal data is an important task in multiple applications, such as finding hot research point from scientific literature, news article series analysis, email surveillance, search query log mining, etc. In contrast to existing works mainly focusing on text document collections,...
In this paper, we introduce a class of vector-valued wavelet packets for vector-valued multivariate function space, which are generalizations of univariate wavelet packets. A procedure for constructing a class of biorthogonal vector-valued wavelet packets in higher dimensions is presented and their biorthogonality properties are characterized by virtue of matrix theory, time-frequency analysis method,...
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