Transparent 2D Markers on an LCD Tabletop System

Tabletop systems are currently being focused on and many applications using these systems are being developed. In such tabletop systems, how to  recognize real objects on the table is an essential and important  issue. In existing tabletop systems, 2-D markers have been often  used. However, their black-and-white pattern, which means nothing to humans, spoils the appearance of the object. We developed transparent markers on a liquid crystal display (LCD) tabletop system by using the polarization features of the LCD and optical films. In particular, through experiments with various kinds of optical films, we found that two half-wave plates make the markers rotation invariant. By using the transparent markers, tangible transparent Magic Lenses(TM) applications were developed.

Hideki Koike, Wataru Nishikawa, Kentaro Fukuchi, Transparent 2-D Markers on an LCD Tabletop System, ACM Human Factors in Computing Systems (CHI 2009), pp.163-172, 2009.