Sho Kimura Ryo Oguchi Hideo Tanida Yasuaki Kakehi Keita Takahashi Takeshi Naemura PVLC projector: image projection with imperceptible pixel-level metadata. 135 2008 SIGGRAPH Posters http://doi.acm.org/10.1145/1400885.1401030 conf/siggraph/2008posters db/conf/siggraph/siggraph2008posters.html#KimuraOTKTN08