A robust spread spectrum watermarking method using two levels DCT
International Journal of Electronic Security and Digital Forensics
An efficient watermarking technique for the protection of fingerprint images
EURASIP Journal on Information Security
IEEE Transactions on Image Processing
A new spread spectrum watermarking method using two levels DCT
International Journal of Electronic Security and Digital Forensics
Asymptotically optimum universal watermark embedding and detection in the high-SNR regime
IEEE Transactions on Information Theory
A robust watermarking technique for copyright protection using discrete wavelet transform
WSEAS Transactions on Computers
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The uncertainties in host signal modeling due to inherent model errors and various attack distortions have prompted the introduction of robust statistics theory in the context of watermark detection. Specifically, the epsi-contamination model was applied to describe the host signals, and statistically robust (SR) watermark detectors assuming known embedding strengths were derived. In this work, we investigate the robust detection structure for multiplicative watermarking. A detection-simulation (DS)-based approach to determine the contamination factor is also presented. Moreover, considering that the strengths of the watermark signals may be adapted to host signals and will very likely change after being distorted by attacks, we go further to propose the asymptotically robust detector for multiplicative watermarks, which can be viewed as the SR counterpart of the locally most powerful watermark detector in the same sense that the SR detector with full knowledge of the watermark strengths is the corresponding parallel for the optimum detector. Experiments on real images demonstrate the superiority of the new schemes over the conventional ones