March 22, 2009
been experimenting with stereo photography since 1962. Now a
new technique for presenting three-dimensional images is making a
splash. On television, it was used for a couple of Super Bowl
commercials last month, followed by an entire episode of the NBC
the March 23 edition of Sports Illustrated and the March 30
edition of Time feature several pages of 3D photos. So
do their sister magazines Fortune, People, and Entertainment
Weekly, part of a corporate tie-in with the March 27 premiere of
the 3D movie Monsters vs. Aliens.
is it the technique all that new? It requires wearing glasses
with lenses tinted two different colors. We've seen that
before. The new twist is that a new pair of colors is now being
used, and the result looks better to people who are not
wearing the special glasses. Allow me to explain.
begins with two different pictures of a scene, taken from different
angles. One represents the viewpoint from a viewer's left eye;
the other, from his right eye.
presenting a stereo picture to a viewer, we need to arrange somehow
for his left eye to see one image and his right eye the other.
We can then rely on his brain to combine the two images to create an
illusion of depth.
stereoscopes placed the images side by side and used lenses or
mirrors to focus each eye on one of the images. However, most
technologies today attempt to display both images at the same
location in space, either on a printed page or on a TV or movie or