Seeing the unseen beyond an image<\/p>\n
By Lim Tri Santosa<\/p>\n
BANDUNG (JP): In the information age, the eyes are really
\ntaking a beating. Our society has become so visual, we
\npractically use our eyes for everything we do. Does this mean
\nthat our eyes are already getting plenty of abuses? Well, if we
\nwere to take a survey of Internet users asking how it felt after
\nseven hours at the computer, I'm guessing that most Internet
\nusers would agree that their eyes were being overused and abused
\nrather than exercised in some healthful way.<\/p>\n
It seems clear that we may need to start taking better care of
\nour eyes as well as our bodies. Such as? For one thing, we can
\ntry to remember to take plenty of breaks from computer gazing and
\nother near-point work. Take eye breaks by looking off into the
\ndistance and focusing on many different targets. You can also
\ntake eye breaks by 3 dimensional (3D) viewing stereo images.<\/p>\n
Today, 3D virtual reality systems require bulky accessories,
\nsuch as headsets and gloves. Forget the fancy gear, you don't
\nneed those crutches.<\/p>\n
At the following websites, you can learn to see 3D view with
\nnothing more than your own eyes and brain. Find out what your own
\nbiological unit is capable of doing, we really do have our sixth
\nsense.<\/p>\n
Stereographic 3D vision allows us to perceive the world as 3D
\nobjects look like they are in front of other objects. What allows
\nus to see in 3D is the fact that our eyes each see a slightly
\ndifferent image. A simple test to see if you will be able to see
\nthe images in the stereograms is doing \"The Famous Frankfurter
\nExperiment\" (www.vision3d.com\/fftext.html). Hold your index
\nfingers up in front of you and look at something behind it.
\nWithout shifting focus to your fingers, how many fingers do you
\nsee? If you see two ghostly images of your fingers floating in
\nthe air, this is the first step toward being able to see our 3D
\nimages.<\/p>\n
Each eye captures its own view and the two separate images are
\nsent to the brain for processing. When the two images arrive
\nsimultaneously at the back of the brain, they are united into one
\npicture. The mind combines the two images by matching up the
\nsimilarities and adding in the small differences. The small
\ndifferences between the two images add up to a big difference in
\nthe final picture. The combined image is more than the sum of its
\nparts. It is a three-dimensional stereo picture.<\/p>\n
With 3D stereo vision, we can see where objects are in
\nrelation to our own bodies with much greater precision,
\nespecially when those objects are moving toward or away from us
\nin the depth dimension. We can see a little bit around solid
\nobjects without moving our heads and we can even perceive and
\nmeasure empty space with our eyes and brains.<\/p>\n
There are some examples of general actions that depend heavily
\non stereo vision such as throwing, catching or hitting a ball,
\ndriving or parking a car, threading a needle and sewing, reaching
\nout to shake someone's hand or pouring liquid into a container. I
\nstill remember about ten years ago when I was learning to park my
\nbrother's car in the garage and made a big scratch on its left
\ndoors, I guess I didn't have stereo vision that time. Occupations
\nlike football player, driver, architect, surgeon or dentist
\nreally depend heavily on stereo vision.<\/p>\n
Stare at the stereogram 3D picture. Don't focus on the
\npatterns on the surface.<\/p>\n
Instead, try to focus beyond the picture. It may take a few
\nminutes but you should see a 3D image emerge from the random
\npatterns. Our two eyes view normal scenes from two slightly
\ndifferent angles, so objects at a distance appear shifted
\nslightly to the left or right. The amount of shift depends on the
\nobject's distance. This shift is called parallax. The difference
\nin the left-right placement is perceived by our brains as a
\ndifference in depth.<\/p>\n
Some people see the 3D pictures very quickly, others may need
\nto spend awhile practicing before seeing their first stereogram.
\nStill others never see the image. If you are having difficulties,
\nremember to be patient. If you know of someone who can see the
\nimages, ask for advice. There are a lot of different tricks
\npeople use to see the images.<\/p>\n
Seeing a 3D object for the first time can be surprising as you
\ndo not expect to see something standing out from a page. Good
\nluck!<\/p>\n
To start your journey into the 3D world, hit your browser at
\nhttp:\/\/www.magiceye.com\/3dfun\/stwkdisp.shtml,
\nhttp:\/\/stereogram.i-us.com\/, http:\/\/www.softsource.com\/stereo.html,
\nhttp:\/\/www.ccc.nottingham.ac.uk\/~etzpc\/sirds.html<\/p>",
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"sponsor": "Okusi Associates",
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