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Definition
A stereoscopic motion or still picture in which the right component of a
composite image usually red in color is superposed on the left component in a
contrasting color to produce a three-dimensional effect when viewed through correspondingly
colored filters in the form of spectacles. The modes of 3D presentation you are
most familiar with are the paper glasses with red and blue lenses. The technology
behind 3D, or stereoscopic, movies is actually pretty simple. They simply recreate
the way humans see normally.
Since
your eyes are about two inches apart, they see the same picture from slightly
different angles. Your brain then correlates these two images in order to gauge
distance. This is called binocular vision - ViewMasters™ and binoculars mimic
this process by presenting each eye with a slightly different image. Now you're
learning! Need to know more about how do 3D glasses work? Read on. The binocular
vision system relies on the fact that our two eyes are spaced about 2 inches (5
centimeters) apart. Therefore, each eye sees the world from a slightly different
perspective, and the binocular vision system in your brain uses the difference
to calculate distance. Your brain has the ability to correlate the images it sees
in its two eyes even though they are slightly different. If you've ever used a
ViewMaster™ or a stereoscopic viewer, you have seen yourbinocular vision
system in action. In a View-Master, each eye is presented with an image. Two cameras
photograph the same image from slightly different positions to create these images.
Your eyes can correlate these images automatically because each eye sees only
one of the images.
A
3D film viewed without glasses is a very strange sight and may appear to be out
of focus, fuzzy or out of register. The same scene is projected simultaneously
from two different angles in two different colors, red and cyan (or blue or green).
Here's where those cool glasses come in -- the colored filters separate the two
different images so each image only enters one eye. Your brain puts the two pictures
back together and now you're dodging a flying meteor!
3D glasses make the
movie or television show you're watching look like a 3-D scene that's happening
right in front of you. With objects flying off the screen and careening in your
direction, and creepy characters reaching out to grab you, wearing 3-D glasses
makes you feel like you're a part of the action - not just someone sitting there
watching a movie. Considering they have such high entertainment value, you'll
be surprised at how amazingly simple 3-D glasses are.
The
binocular vision system relies on the fact that our two eyes are spaced about
2 inches (5 centimeters) apart. Therefore, each eye sees the world from a slightly
different perspective, and the binocular vision system in your brain uses the
difference to calculate distance. Your brain has the ability to correlate the
images it sees in its two eyes even though they are slightly different.
If
you've ever used a View-Master or a stereoscopic viewer, you have seen your binocular
vision system in action. In a View-Master, each eye is presented with an image.
Two cameras photograph the same image from slightly different positions to create
these images. Your eyes can correlate these images automatically because each
eye sees only one of the images.
The
reason why you wear 3-D glasses in a movie theater is to feed different images
into your eyes just like a View-Master does. The screen actually displays two
images, and the glasses cause one of the images to enter one eye and the other
to enter the other eye. There are two common systems for doing this:
Although
the red/green or red/blue system is now mainly used for television 3-D effects,
and was used in many older 3-D movies. In this system, two images are displayed
on the screen, one in red and the other in blue (or green). The filters on the
glasses allow only one image to enter each eye, and your brain does the rest.
You cannot really have a color movie when you are using color to provide the separation,
so the image quality is not nearly as good as with the polarized system.
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