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In the paper, a new blind image steganalysis scheme for JPEG image steganography is proposed. Space filling curve is exploited to scan quantized block DCT coefficients. Markov model is applied to model the dependencies between quantized DCT cofficients so as to extract intrablock and interblock transition probability matrices. The experiments on F5, Steghide and MB1 steganography show the method can...
In the paper, a new universal image steganalysis system based on wavelet packet decomposition (WPD) and empirical transition matrix in wavelet domain is proposed. First, it decomposes the test image using two-level Haar WPD. The statistical analysis is made both for the test image and their wavelet packet subbands. Second, it exploits the interscale and intrascale dependencies between wavelet coefficients...
Adaptive blind channel identification and equalization methods of two types MIMO-OFDM systems based on subspace are discussed. The proposed method employs reduced-rank orthogonal iteration to estimate noise subspace with low computational complexity. Oversampling autocorrelation matrix is applied to obtain redundant information, when the number of transmit antenna is greater than that of receive antenna...
Method of moments (MOM) is applied extensively in electromagnetics, but the impedance matrix from MOM is so dense that it will consume prohibitive time if using the direct solver. In this paper, we will sparse the MOM-matrix using discrete wavelets transform method (DWT), and take the Daubechies wavelets of order N = 3 for example, introducing the theory of DWT and the construction of the transformation...
This paper deals with the placement of a minimal set of PMUs so as to make system completely observable and collect more valuable dynamic data of power systems at the same time, i.e. place as more PMUs as possible on buses with higher parameter sensitivities. A practical sensitivity analysis method is adopted to calculate parameter sensitivities of every bus and an initial PMU placement is provided...
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