Information Technology Reference
In-Depth Information
Figure 1: Monocular HMD.
Figure 2: Binocular HMD.
what is projected by a computer in the display and therefore they cannot see
anything of the surrounding environment.
2.2
Optical HMD
An OHMD uses an optical mixer which is made of partly silvered mirrors,
and it has the capability of reflecting artificial images as well as letting real
images to cross the lens and let a user to look at the world around him.
Optical mixers do not let light completely reach user's eyes and therefore
real-world view turns out to be veiled and virtual objects seem to float on the
real ones rather than hiding them.
Furthermore, due to image contrast being affected by lightening intensity,
digital graphics are unlikely to be easily distinguished in a bright environ-
ment or in front of a light background.
Another problem comes from the different focus planes of virtual and real
images, so that it is quite difficult to have both images properly focused [1].
Generally speaking, an optical display cannot perform like a human eye
either for space or for colour.
