Operation Manual
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5.5.11. SIRDS – Single Image Random Dot Stereograms
Pic. 17. SIRDS Image
Single Image Random Dot Stereograms (SIRDS, sometimes called
Autostereograms) allow the viewer to perceive three dimensional information
using one image.
Autostereograms represent one of the latest approaches to creating the illusion of
three dimensions.
How to view Autostereograms ?
Most Stereogram pictures are usually generated so that if you look at (converge
your eyes on) a position twice as far away as the picture, and focus on the picture,
generally after a few minutes you see a surprising 3D image.
Most people find this extremely difficult for the first time. You have to focus on a
point which is different from where you are looking. This is known as "de-
coupling" your vision process. Instinctively people focus at the same point they are
looking at, and this is the main obstacle in seeing images of this type.
There are many ways to teach this de-coupling to either yourself or to others,
including (in almost no particular order):
It is generally easier to see Stereograms under bright
light because your eye relies less on focus under harsh
conditions. Another point, to see stereo images, you
need to have "passable" use of both eyes. If you wear
glasses try with and without them on. Some short-
sighted people can see them easier without their glasses
on ( if they get closer to the picture ).
NOTE !
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