Comparative Study of Wavelet Based Lattice QIM Techniques and Robustness against AWGN and JPEG Attacks

Authors:
Dieter Bardyn;Ann Dooms;Tim Dams;Peter Schelkens
Affiliations:
Dept. of Electronics and Informatics (ETRO), Vrije Universiteit Brussel (VUB), Interdisciplinary Institute for Broadband Technology (IBBT), Brussels, Belgium B-1050;Dept. of Electronics and Informatics (ETRO), Vrije Universiteit Brussel (VUB), Interdisciplinary Institute for Broadband Technology (IBBT), Brussels, Belgium B-1050;Dept. of Electronics and Informatics (ETRO), Vrije Universiteit Brussel (VUB), Interdisciplinary Institute for Broadband Technology (IBBT), Brussels, Belgium B-1050 and Dept. of Applied Engineerin ...;Dept. of Electronics and Informatics (ETRO), Vrije Universiteit Brussel (VUB), Interdisciplinary Institute for Broadband Technology (IBBT), Brussels, Belgium B-1050
Venue:
IWDW '09 Proceedings of the 8th International Workshop on Digital Watermarking
Year:
2009

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Abstract

We study watermarking techniques based on Quantization Index Modulation for which sets of lattice quantizers Q m are used (LQIM). A recipe for constructing such quantizers Q m is proposed, where the size of these sets is variable, so that the payload is easily adaptable. We make a comparative study of 8 dimensional lattices with good quantizer properties, where the embedding is done in the wavelet domain. Along the way, the gap between the theoretical ideas behind QIM and practical systems using lattices is closed by extending techniques, such as dithered quantizers and distortion compensation, from the scalar case to LQIM.