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How do Polarized 3D Glasses work?
Polarized 3D Glasses
As a good example of stereoscopy, the polarized 3D glasses immediately creates the illusion of three-dimensional pictures by using filters to restrict light that normally would reach the eye. To present a stereoscopic motion picture, two images are projected superimposed onto the same screen through orthogonal polarizing filters. All the viewer has to wear is a cheap pair of spectacles which contain a similar filters. The effect is managed due to the fact that light is only passed through each filter when it has been similarly polarized and has blocked the orhogonally polarized light
3D Glasses
Polarized light rays bouncing off a cinema screen often get diffused and this de-polarization can be problematic. If an aluminized or silver screen is used, the situation can be resolved. This means that a pair of aligned DLP projectors, some polarizing filters, a silver screen, and a computer with a dual-head graphics card can be used to form a relatively low-cost In 2003 the value was under ten thousand US dollars. For people wearing polarized glasses this is the perfect system for displaying 3d data Several commercial and open source packages were made available thanks to the system GeoWall, used for some time now in the Earth Sciences.
Polarized 3D Glasses
To create a combined image, partially silvered mirrors with two image screens at right angles to each other should result in a practical stereo image that can be presented to a single user. Whilst you will be able to view one of these images as a reflection, you will be able to view the other directly through the angled mirror. Correctly adjusted glasses are equipped and filters, properly polarized, are attached to the image screens. A similar technique used with appropriate polarizer’s is to use a single screen viewed in a horizontal partial reflector,with an upright image placed below the reflector. Cathode ray screens are best suited to polarizing glasses, since LCD screens contain polarizers to control the presentation of pixels, and the polarization can conflict.
An economical application of this principle was discovered in 2003 by Keigo Iizuka, using cellophane sheets on laptop display screens. Polarized stereoscopic pictures first came about in 1936, when Edwin H. Land first applied it to motion pictures. 1952 through 1955 was when the “3-D madness” hit most theatres ,offering patrons 3-D glasses. Only a minute amount of the total 3D films shown in the period used the anaglyph color filter method. The novel aspect is their use of digital projection and high-tech IMAX 70mm film projectors, with extremely trustworthy mechanical parts. Using varying forms of polarization, a completely new chronicle of 3D animation films are now beginning to reveal themselves to theaters. Polarization is not easily applied to home 3-D broadcast or DVD presentation. At this point only anaglyph glasses may be used to view the new HD shows and are beginning to be aired occasionally by NBC and the Discovery Channel.

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3D Glasses - How Do They Work?
The Science of 3D Glasses
3D Glasses
Most human beings have fantastic binocular vision, thanks to having two healthy, working eyes. Objects can appear up to twenty feet. 6 thru 7 meters at a distance, the binocular system of vision allows us to gauge effortlessy and precisely the distance to an object. As an example, when we see multiple objects, we are able to automatically distinguish those that are nearer from those that are farther, and how far away they are. Looking at the world with one eye closed will still allow you to perceive distance; however, your accuracy will decrease because you must rely on visual cues for focusing distances.

To see how much of a difference the binocular vision system makes, have a friend throw you a ball and try to catch it while keeping one eye closed. The differences become more obvious when tried in a darkened room or at night. If you only have one eye open, it will be much more difficult to catch a ball than if you have two open.
Anaglyph 3D Glasses
The binocular system of vision depends on the fact that our pair of eyes are located approximately two inches at a distance. (just over an inch) separately. The binocular vision system works since the brain is able to utilize the different perspective obtained from each eye and process them together to calculate distance. The brain possesses the capability to connect the images seen through the two eyes even if they are somewhat unlike. 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 separately.

You have seen the binocular vision system at work if you have looked through a View-Master or stereoscopic viewer. The way a View-Master works is that an image is shown to both eyes. The image is created by two different cameras photographing the same image from different angles. Your eyes can correlate these images automatically because each eye sees only one of the images.