Rational Dither Modulation has been proposed as an effective QIM watermaking algorithm which is robust against value-metric scaling. Invariance is obtained by quantizing a rational function of the host features instead of the features themselves. In this paper we propose a vector extension of the basic RDM scheme. Specifically, a sequence of feature ratios is quantized vectorially with the aid of a properly designed dirty trellis code. A fast sub-optimum embedding algorithm is proposed ensuring fast watermark insertion and good distortion properties. Preliminary results show that a significant advantage is obtained with respect to conventional RDM.
Abrardo, A., Barni, M., Pérez-González, F., Mosquera, C. (2005). Trellis-coded rational Dither Modulation for digital watermarking. In IV International Workshop on Digital Watermarking (pp.351-360). Berlin : SPRINGER-VERLAG [10.1007/11551492_27].
Trellis-coded rational Dither Modulation for digital watermarking
Abrardo A.;Barni M.;
2005-01-01
Abstract
Rational Dither Modulation has been proposed as an effective QIM watermaking algorithm which is robust against value-metric scaling. Invariance is obtained by quantizing a rational function of the host features instead of the features themselves. In this paper we propose a vector extension of the basic RDM scheme. Specifically, a sequence of feature ratios is quantized vectorially with the aid of a properly designed dirty trellis code. A fast sub-optimum embedding algorithm is proposed ensuring fast watermark insertion and good distortion properties. Preliminary results show that a significant advantage is obtained with respect to conventional RDM.
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https://hdl.handle.net/11365/45806
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