Binocular Vision and Stereopsis (Oxford Psychology Series) by Ian P. Howard

By Ian P. Howard

This publication is a survey of data approximately binocular imaginative and prescient, with an emphasis on its position within the belief of a 3-dimensional international. the first curiosity is organic imaginative and prescient. In every one bankruptcy, physiological, behavioral, and computational methods are reviewed in a few element, mentioned, and interrelated. The authors describe experiments required to respond to particular questions and relates them to new terminologies and present theoretical schemes.

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Sample text

Joseph Niepce produced the first photograph in about 1826 and Louis Daguerre produced his first successful daguerreotype photograph in 1837. In 1841 Wheatstone employed two photographers to help him produce the first photographic stereogram which was a portrait of Charles Babbage. By 1846 stereoscopic photographs were being sold in a shop in Soho Square, London. However, stereoscopic photography did not arouse much interest because inexpensive stereoscopes were not available. Brewster took his prism stereoscope to Paris in 1850 and engaged the interest of the optician Jules Duboscq who built a number of them.

This limitation is overcome in the random-dot autostereogram, described next. 1, is viewed with both eyes, the images can be fused with various angles of convergence. As convergence changes, the images come into correspondence at every multiple of the spatial period of the pattern. The pattern appears closer and smaller when the eyes are converged, and larger and more distant when they are diverged. This is the wallpaper effect. Brewster (1844a, 1844b) created relative depth by introducing small horizontal deviations of opposite sign into adjacent elements of a repeating pattern.

The visual axis in the human eye is at an angle of about 5° to the optic axis. It is displaced from the optic axis because the pupil is not quite central with respect to the cornea and lens. For most purposes it is convenient to specify the position of an eye by the position of its nodal point. One can construct the retinal image produced by any object by drawing straight lines from each point on the object through the nodal point. The nodal point is also referred to as the station point. 1. The visual fields.

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