@conference {spie06:sme, title = {Secret dither estimation in lattice-quantization data hiding: a set-membership approach}, booktitle = {Security, Steganography, and Watermarking of Multimedia Contents}, series = {Proc. of SPIE}, volume = {5306}, year = {2006}, month = {January}, pages = {592-601}, publisher = {SPIE}, organization = {SPIE}, address = {San Jose, California, USA}, keywords = {data-hiding, security, watermarking}, author = {Luis P{\'e}rez-Freire and Fernando P{\'e}rez-Gonz{\'a}lez and Pedro Comesa{\~n}a}, editor = {Edward J. Delp and Ping W. Wong} }