Power Spectrum Condition for Energy-Efficient Watermarking

10 years 3 months ago
Power Spectrum Condition for Energy-Efficient Watermarking
This paper presents a model for watermarking and some attacks on watermarks. Given the watermarked signal, the so-called Wiener attack performs minimum mean-squared error (MMSE) estimation of the watermark and subtracts the weighted MMSE estimate from the watermarked signal. Under the assumption of a fixed correlation detector, the attack is shown to minimize the expected correlation statistic for the same attack distortion among linear, shift-invariant filtering attacks. It also leads to the idea of energy-efficient watermarking--watermarking that resists MMSE estimation as much as possible--and provides a meaningful way to evaluate robustness. The paper shows that energy-efficient watermarks must satisfy a power-spectrum condition (PSC), which states that the watermark's power spectrum should be directly proportional to the original signal's. PSC-compliant watermarks are proven to be most robust. Experiments with signal models and natural images demonstrate that watermarks ...
Jonathan K. Su, Bernd Girod
Added 03 Aug 2010
Updated 03 Aug 2010
Type Conference
Year 1999
Where ICIP
Authors Jonathan K. Su, Bernd Girod
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