Fully Robust Spread Spectrum Wavelet Watermarking System
نویسندگان
چکیده
Existing spread spectrum based watermarking techniques can not despread the encoded signal as expected in a typical spread spectrum communication system. Also the change in the statistics of the watermarked image as a result of attacks are not adequately compensated. It is therefore expected that these systems have not yielded the desired fully robust characteristics. This paper presents a spread spectrum technique for digital image watermarking. During the detection phase the spatial-frequency localization property of wavelet transform is explored and compensated for attack-induced changes in the statistics of the watermarked images. Experimental results from the system exhibit excellent anti-jamming features similar to spread spectrum communication techniques. Furthermore they confirm the superior performance over existing correlation-based spread spectrum wavelet watermarking system.
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