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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...
A video watermarking robust algorithm based SVD is proposed. In order to analyze both the spatial and temporal characters of video sequence, each frame of the video is transformed to wavelet domain by 2-D DWT, and then 1-D DCT is used along the temporal axis. Watermarks were embedded into the singular values (SVs) of the coefficient frames and in the extraction procedure watermarks can be detected...
If the user can compress the multimedia repeatedly, it will decrease the numbers of different resolution copies largely, and then reduce the transmission volume. Combining tamper-detection with DCT-based multi-compression will bring great benefit to the owner in copyright protection system. By embedding the information into the maximal quantized DCT coefficient, the user may make compression with...
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