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Robust Watermarking Algorithm in Ridgelet Domain and Reliability Analysis


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Robust Watermarking Algorithm in Ridgelet Domain and Reliability Analysis
XIAO Liang1WEI Zhi-hui2
1.School of Computer Science and Technology;2.School of Sciences,NUST,Nanjing 210094,China
digital watermarking ridgelet transform parameter estimation reliability analysis
According to the properties that ridgelet can capture the linear singularity but can not represent the curve singularity,a robustness watermarking algorithm based on ridgelet transform of image block is proposed.The watermarks are embedded into the ridgelet coefficients in the highest energy direction of each block.Under the restraints of the invisibility and detectability for watermarks,a mathematical model on the watermarking strength is proposed according to the restraints of the Peak Signal Noise Ratio and the invariance of the highest energy direction.The value interval of watermarking strength is also given.The watermarks can be blindly detected by correlation function and the optimal threshold is also estimated by minimizing the probability of missing alarm with respect to the given probability of false alarm less than 10-8.Experimental results show that the proposed algorithm can achieve a better tradeoff between the robustness and transparency.


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Last Update: 2012-12-19