![]() One way to help the brain concentrate on divergence instead of focusing is to hold the picture in front of the face, with the nose touching the picture. Most stereo image are designed for divergent (wall-eyed) viewing. ![]() "Like learning to ride a bicycle or to swim, some pick it up immediately, while others have a harder time." If one has two eyes, fairly healthy eyesight, and no neurological conditions which prevent the perception of depth then one is capable of learning to see the images within autostereograms. Bela Julesz, a psychologist researching on depth perception and pattern recognition, created random-dot stereo images, which are pictures consisting of a uniform, random distribution of dots. In 1930s, inventor Edwin Land replaced the red and green filters in the du Haron's anaglyphs with two planes of polarised light. And then in 1891, Louis Ducas du Haron created the first printed anaglyphs-photographs consisting of two negatives(one in blue or green, the other in red) printed on the same sheet of paper to form a stereoscopic photograph. In 1846, W Rollman invented 3D anaglyphs, which are two sets of superimposed identical line drawing(one in blue and the other in red), which when viewed through red and blue glasses, appeared to be three-dimensional. The monocular pictures through the cameras gave the resulting image a 3D effect. The stereo camera combined the refracting stereoscope with two separate cameras which were placed slightly apart. ![]() Brewster used what he discovered in building the stereo camera. ![]() However, Wheatstone's invention was impractical until Sir David Brewster, a Scottish physicist and experimenter of optics, discovered that a 3D effect could be observed in repeated patterns with small difference in 1844. Since then, people began to understand the concept of stereo view. The stereoscope is a binocular device through which a pair of monocular images was projected to both eyes in such a way that the optic axes converge at the same angle, which gives the impression of a 3D image. Five years later, according to what he discovered, he invented the stereoscope. In 1833, an English scientist Charles Wheatstone, discovered that because human eyes are not exactly the same distance apart, objects viewed through eyes are not the same, thus creating an illusion of depth. A 3D stereo view is the viewing of objects through any stereo pattern.
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