There are several methods for bringing images into the third dimension. Of these, two offer the tantalizing prospect of 3D TV without the need of glasses. Parallax barrier images work by using binocular disparity, or the difference between what each eye sees, while holographic technology focuses on the location of the objects rather than the screen itself. Illusions and Dividing Dimensions Though they differ in details, all 3D TV glasses work by projecting different images onto the left and right eye. Specifically, the TV shows two separate images, and the glasses filter them so that each eye sees only...
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