@article {abrardo06, title = {Improving the performance of RDM watermarking by means of trellis coded quantisation}, journal = {IEE Proceedings on Information Security}, volume = {153}, number = {3}, year = {2006}, month = {September}, pages = {107-114}, keywords = {data-hiding, watermarking}, author = {Andrea Abrardo and Mauro Barni and Fernando P{\'e}rez-Gonz{\'a}lez and C. Mosquera} }