Stereoscopic Vision

Abstract

Using the coloured filters included with the book, stereoscopic depth can be seen when viewing anaglyphs of designs and photographs. Anaglyphs are stereograms in which the left and right eye images are superimposed, but printed in different colours, such as red and cyan. When seen with a red filter over one eye and a cyan one over the other, the combined image is separated into a red and black image to one eye with a cyan and black image to the other, and binocular fusion may take place between the disparate black images. This method is also effective with projected images, and has been the basis of so-called 3D films. Stereoscopic vision means seeing in depth by virtue of the lateral displacement of the eyes. The small differences or disparities between the retinal images can be simulated with the use of a stereoscope. By viewing paired pictures taken from slightly different viewing positions it is possible to combine and see them in depth. In addition to stereo effects, rivalry between different patterns presented to each eye can be experienced. Stereo artists play subtle games with our binocular vision and examples are shown here.