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2010-01-26 17:29:17
A 3D display is any display
device capable of conveying
images to the viewer. The optical principles of multiview auto-stereoscopy have
been known for over a century. [1] Practical displays with a high resolution have recently
become available at much lower prices. As a result, the commercialization of 3D
displays for entertainment is receiving increasing funding.
Contents:
1. Types of 3D displays
1. 1. Stereoscopic
Main article:
Based on the principles of ,
described by in the ,
stereoscopic technology uses a separate device for each person viewing the
scene to provide a different image to the person's left and right eyes.
Examples of this technology include anaglyph images and glasses. Stereoscopic
technologies generally involve special .
1. 2. Autostereoscopic
Main article:
An evolutionary development of stereoscopy, autostereoscopic display
technologies use optical trickery at the display, rather than worn by the user,
to ensure that each eye sees the appropriate image. They generally allow the
user to move their head a certain amount without destroying the of depth.
Automultiscopic displays include view-dependent with different intensities and
colors based on the ; this means that a number of different views of the same scene can be
seen by moving horizontally around the display. In most automultiscopic
displays the change of view is accompanied by the breakdown of the illusion of
depth, but some displays exist which can maintain the illusion as the view
changes [2] .
This category of display technology includes .
1. 3. Computer-generated holography
Main article:
The is a familiar
artifact of the late 20th century, and research into holographic displays has
produced devices which are able to create a identical to that
which would emanate from the original scene, with both horizontal and vertical
parallax across a large range of viewing angles. The effect is similar to
looking through a window at the scene being reproduced; this may make CGH the
most convincing of the 3D display technologies, but as yet the large amounts of
calculation required to generate a detailed hologram largely prevent its
application outside of the laboratory. Some companies do produce holographic
imaging equipment commercially. [3]
1. 4. Volumetric displays
Main article:
In addition there are volumetric displays, where some physical mechanism
is used to display points of light within a volume. Such displays use instead of . Volumetric displays include
multiplanar displays, which have multiple display planes stacked up; and
rotating panel displays, where a rotating panel sweeps out a volume.
Other technologies have been developed to project light dots in the air
above a device. An infrared laser is focused on the destination in space,
generating a small bubble of plasma which emits visible light. As of August
2008, the experiments only allow a rate of 100 dots per second. One of the
issues which arise with this display system is the use of technologies that
could be harmful to human eyes.
2. Problems
Each of these display technologies can be seen to have limitations,
whether the location of the viewer, cumbersome or unsightly equipment or great
cost. Overcoming the latter is perhaps the key challenge for the budding
3-dimensional imaging sector. The acquisition of artifact-free 3D images
remains difficult. Photographers, videographers, and professionals in the
broadcast and movie industry are unfamiliar with the complex setup required to
record 3D images. There are currently no guidelines or standards for
multi-camera parameters, placement, and post- production processing, as there
are for conventional 2D television.
3. See also
4. References
