Indexing Lattice Vectors in a Joint Watermarking and Compression Scheme

The problem of the design of a joint watermarking and compression (JWC) scheme allowing an efficient variable rate coding is addressed here. We have proposed in previous works a method, called modulated lattice vector quantization (MLVQ), based on dither modulation and lattice vector quantization (LVQ) and have shown experimentally its good performances. In this paper, we first show theoretically that the use of a multidimensional lattice codebook must be privileged in JWC. To benefit from this property, an indexing method dedicated to the MLVQ codebook is proposed. It is based on the use of the geometrical properties of the MLVQ codebook