%0 Conference Paper %B Security and Watermarking of Multimedia Contents %D 2003 %T Hexagonal Quantizers are not Optimal for 2-D Data Hiding %A Félix Balado %A Fernando Pérez-González %E Ping W. Wong %E Edward J. Delp %K data-hiding %K watermarking %B Security and Watermarking of Multimedia Contents %S Proc. of SPIE %C Santa Clara, USA %V 5020 %8 jan %G eng