Mid-air plus: a 2.5 D cross-sectional mid-air display with transparency control

In design process and medical visualization, e.g. CT/MRI cross-sectional images, exterior and interior images can help users to understand the overall shape of volumetric objects. For this purpose, displays need to provide both vertical and horizontal images at the same time. To display cross-sectional images, an LCD display [Cassinelli et al. 2009] and image projection [Nagakura et al. 2006] have been proposed. Although these displays could show internal images of volumetric objects, seamless crossing of internal and external images cannot be realized since the images are limited to physical displays.