Halftone Visual Cryptography Embedding a Natural Grayscale Image Based on Error Diffusion Technique.

Emi Myodo Koichi Takagi Satoshi Miyaji Yasuhiro Takishima Halftone Visual Cryptography Embedding a Natural Grayscale Image Based on Error Diffusion Technique. 2114-2117 2007 ICME http://dx.doi.org/10.1109/ICME.2007.4285100 conf/icmcs/2007 db/conf/icmcs/icme2007.html#MyodoTMT07