Stereoscopy Outline
Visual Effects Thursday 7-10pm

1. Introduction
A: Stereoscopy (also called stereoscopic or 3-D imaging) refers to a technique for creating or enhancing the illusion of depth in an image by presenting two offset images separately to the left and right eye of the viewer. Both of these 2-D offset images are then combined in the brain to give the perception of 3-D depth. Three strategies have been used to accomplish this: have the viewer wear eyeglasses to combine separate images from two offset sources, have the viewer wear eyeglasses to filter offset images from a single source separated to each eye, or have the light source split the images directionally into the viewer's eye.
2. Background
• Accommodation of the eyeball (eyeball focus)
• Occlusion of one object by another
• Subtended visual angle of an object of known size
• Linear perspective (convergence of parallel edges)
• Vertical position (objects higher in the scene generally tend to be perceived as further away)
• Haze, desaturation, and a shift to bluishness
• Change in size of textured pattern detail
3. Characteristics
Little or no additional image processing is required. Under some circumstances, such as when a pair of images is presented for crossed or diverged eye viewing, no device or additional optical equipment is needed.
4. Imaging Methods
If anything is in motion within the field of view, it is necessary to take both images at once, either through use of a specialized two-lens camera, or by using two identical cameras, operated as close as possible to the same moment.
5. Multi-rigged stereoscopic cameras
The precise methods for camera control have also allowed the development of multi-rig stereoscopic cameras where different slices of scene depth are captured using different inter-axial settings,[64] the images of the slices are then composed together to form the final stereoscopic image pair.
6. Conclusion