Image Processing Reference
In-Depth Information
Fig. 4.6 Micro-lens array
based display
Mine [
15
]) while others are based on parallax barrier (SeeLinder developed by
Nagoya University [
16
]).
4.2.2.2 Holoscopic Displays
Holoscopic display systems use a lenticular array (like the holoscopic capture
systems) setup in front of a screen (see Fig.
4.6
). The micro-lenses of the lenticular
array allow the user to see only a particular part of each MI corresponding to the
angle of view (allowing motion parallax). An example of holoscopic display by
NHK is described in [
6
]. In their standard configuration, holoscopic systems
provide a pseudoscopic image (i.e., with reversed depth) that needs to be converted
to an orthoscopic image. Many improvements are proposed in the literature to solve
the current limitations of holoscopic display systems like the limited depth of field,
limited range of viewing angles, or the conversion from pseudoscopic to ortho-
scopic image [
17
,
18
]. Among all the display systems cited in [
6
], only integral
imaging systems have directive properties in the vertical direction hence are able to
display content with full parallax.
4.2.3 Tradeoffs Between Integral Imaging
and Super Multi-View
Integral imaging and SMV technologies both provide light-field representations
because they both sample a subset of the light-field of a scene by capturing images
of that scene from several angles of view. However, this sampling is done in two
different ways, implying the following tradeoffs. Using a camera rig allows to
obtain a wider baseline (e.g., several meters) than using a holoscopic camera for
which the baseline is limited by the size of the micro-lens array. With holoscopic
cameras, the resolution of the viewpoint images is limited because the same sensor
is shared between all the captured views, while with a camera rig the full resolution
of each camera is used for each view. Finally, holoscopic cameras allow a denser
sampling of the light-field, because with a camera rig the distance between each
view is limited by the size of the cameras.
