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Quantization-based watermarking schemes such as SCS and QIM are known to be very vulnerable to the amplitude modification attack. Thus accurate estimation of the amplitude modification, i.e., estimation of a modified quantization step size is required before watermark detection. In this paper, we propose a robust algorithm to estimate the modified(More)
Scalar quantization-based watermarking schemes are very vulnerable to amplitude modification attack. To overcome this problem, we propose a novel and robust algorithm that estimates the modified quantization step size by searching QE (quantization error) function. For efficient searching of QE curve, we analyze the peak curve of QE analytically and derive(More)
A new TDE technique using the CPSP function weighed on each band is proposed. Observed and theoretical CPSP spectra are uniformly divided into several bands, and time delay having maximum cross correlation coefficient between observed and theoretical CPSP functions on each band is searched. Then the observed CPSP function is weighted according to the phase(More)
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