Information Technology Reference
In-Depth Information
correctly perceive the stereoscopic image, as incorrect positioning results in incor-
rect images reaching the eye. A major disadvantage of lenticular lens based sys-
tems is their inability to use the displays in 2D with full resolution.
Lenticular 3D display manufacturers include Alioscopy [43], Philips (now re-
tired from 3D display business) [44], NEC [4] and Tridelity [41].
Since both parallax barrier and lenticular lens based displays require a flat
panel display underneath, the size of these 3D displays is always limited by the
maximum size of such panels manufactured. As of November 2009, the maximum
size is slightly more than 100 inches diagonal. Since tiling such displays is not
seamless, these technologies are not scalable to arbitrary large sizes.
3.3 Wavelength Selective Filters
Another possible implementation is using wavelength selective filters for the
multi-view separation. The wavelength-selective filter array is placed on a flat
LCD panel oriented diagonally so that each of the three colour channels corre-
spond to a different direction, creating the divided viewing space necessary for
3D vision. A combination of several perspective views (also combining colour
channels) is displayed. The filter array itself is positioned in front of the display
and transmits the light of the pixels from the combined image into different direc-
tions, depending on their wavelengths. As seen from the viewer position different
spectral components are blocked, filtered or transmitted, separating the viewing
space into several zones where different images can be seen [45].
3.4 Multiview 3D Uncompressed Image Formats
Common image formats used by multi-view displays include multiple images on
multiple links, 2D+Depth (described earlier), 2D+Depth with two layers, and the
extension of frame-doubling, side-by-side and interleaving to the multi-view case.
Using multiple links, the same number of display interfaces are provided as
many views the display have (possibly combined with side-by-side or similar, re-
ducing the number of links needed). When used for multi-view, the 2D + Depth
approach is often criticized for missing parts of the scene behind occluded objects.
This effect is somewhat reduced by using two layers, that is 2D + Depth + Oc-
cluded 2D + Occluded depth, what Philips calls Declipse format. An example 3D
image in Declipse format can be seen in Fig. 10.
Frame doubling, side-by-side and interleaving (either horizontal or vertical), as
described at stereoscopic displays can be naturally extended for using with multi-
ple views. However, if the resolution of the image is to be kept, even more signifi-
cant reduction in the resolution of the component images is required. We have to
note that in case of multi-view displays, the resolution of the individual views is
divided anyway as it cannot have more pixels than the underlying LCD panel.
