Visual Cryptography Based on Void-And-Cluster Halftoning Technique.

Emi Myodo Shigeyuki Sakazawa Yasuhiro Takishima Visual Cryptography Based on Void-And-Cluster Halftoning Technique. 97-100 2006 conf/icip/2006 ICIP http://dx.doi.org/10.1109/ICIP.2006.312371 db/conf/icip/icip2006.html#MyodoST06