@article {uvigo:statistical, title = {Statistical Analysis of Watermarking Schemes for Copyright Protection of Images}, journal = {Proc. of the IEEE}, volume = {87}, number = {7}, year = {1999}, note = {Special Issue on Identification and Protection of Multimedia Information}, month = {July}, pages = {1142{\textendash}1166}, keywords = {data-hiding, watermarking}, author = {Juan R. Hern{\'a}ndez and Fernando P{\'e}rez-Gonz{\'a}lez} }