Screen to glasses to eyes to brain
I have known how these 3D glasses work and if you dont know this blog is for you.
Humans are born with two eye which is useful when using binocular vision which is used to tell the distance of objects with some accuracy. Using one eye to tell the distance of object can be done but it is slower and less accurate.
It is harder to catch a ball with one eye open then with both eyes, i have tried this and i advise you to try the same.
http://img.tomshardware.com/us/2005/05/02/3d_stereo_technology/wahrnehmung.jpg
Both of your eyes see the world from a slightly different perspective because they are 2 inches apart and this is what is called the binocular vision system. The binocular vision system in your brain uses the difference to calculate distance and this is being done all the time. Using the two images captured by the eyes, the brain can pick out objects in the two scenes it sees and calculate how far the objects are.
Your brain has the ability to correlate the images it sees in its two eyes even though they are slightly different. The correlator can pick out objects in the two scenes it sees and calculate how far apart an object is between the two images. Objects that are farther apart in the two images are closer than objects that are not so far apart.
HowStuffWorks “How do 3-D glasses work?”. Available at: http://entertainment.howstuffworks.com/question360.htm [Accessed October 10, 2009].
The stereoscopic vision system uses the same principles and using a flat image the eyes can be shown different perspectives.
When watching a 3DS movie, you wear 3D glasses so the glasses can filter out the video before it reaches your eyes. In a 3D movie the screen is displaying two images. With the glasses the eye see a different image to enter one eye and the other image to enter the other eye.
The system i have been working with is Red/Green or Yellow/Blue. Two images are displayed on the screen, one in red and the other in Green, the when you see the image each lens will onlt pick up one image therefore it can be used to add perspective to a otherwise flat image.
http://www.rkm3d.com/How-3D-Works/images/how-an-anaglyph-works.png
Another techneque is Polarization but Polarization cannot work on an ordinary TV screen, so the red/green system is used.
