By creating or enhancing the illusion of depth in an image using two offset images separately to the left and right eye of the viewer, this method is call Steroscopy, stereroscopic or 3D imaging.
It is “trick” to the brain that gives the perception of 3-D depth using combination these 2-D offset images.
Three strategies have been used to accomplish this:
- Separate images from two offset sources and let the viewer wear eyeglass to combine the images.
- Offset images from a single source separated to each eye and let the viewer wear eyeglasses to filter it.
- Split the images directionally into the viewer's eyes using light source and no glasses required which is also known as Autostereoscopy (Wikipedia.org).
