sterescopic
posted by Video
Recently we blogged about 3-D graphics.
This post is going to talk about another type of 3-D: Stereoscopic.
This is where the image appears to jump off the screen and typically
requires the viewer to wear special glasses. The technology has been
around for a while (since the 1800s, actually!) but has recently gained
popularity with theatrical movie releases and even sporting event
broadcasts.
How is the content produced?
One way to create stereoscopic images is to use 3-D computer graphics.
Most 3-D software packages have the ability to set up a stereoscopic
camera (see coffee cup below).
Stereoscopic video is recorded either with two cameras side-by-side or a
special camera with two lenses. These two lenses capture the image at
different horizontal positions, roughly the same distance apart as the
human eyes, creating a parallax (or displacement) between the two
images. Objects closer to the camera will have greater displacement
among the two images.
To illustrate this, hold up a finger about two inches from your nose and
alternate closing each eye quickly. You'll notice the location of your
finger appears to jump between the two views. Now, move it arms-length
away and do the same. The apparent location of your finger won't change
as drastically. 3-D cameras capture images just like human eyes!
How is it viewed?
To view a stereoscopic image, the captured left/right images need to be
projected to the appropriate eye. This is usually done through the use
of glasses. There are many types of 3-D glasses; some of the most common
ones are:
Passive/Complementary color anaglyph – This is the typical red/cyan
glasses you got with comic books. The colored lenses filter out the
opposite side so each eye only sees the part of the image intended for
that eye. So if the right-side image is tinted red, the left lens is
red, which blocks out the image on the right. The downside of this
method is it sacrifices color quality.
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TAGS:
thundertech, 3-D, 3d, glasses-free, no glasses, glasses, tvs, television, video, b2b, b2c, marketing, autostereoscopy, technology, sterescopic, sterescopic 3d, computer graphics, camera, lenses, 3d video, business, marketers
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