random-dot stereogram

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A type of anaglyph for studying binocular depth perception invented by the Hungarian-born US radar engineer and psychologist Bela Julesz (1928–2003) at Bell Telephone Laboratories in 1960, consisting of two random arrays of dots that when viewed stereoscopically, one array being viewed by each eye, appears to contain a form such as a triangle or square lying in a plane either in front or behind the rest of the dots, bounded by an illusory contour. It is constructed by generating two arrays of randomly placed dots, identical except for a clearly defined region that is slightly shifted sideways in one of the arrays, and it is usually presented for viewing by printing one of the arrays in red and the other in green or cyan (blue-green), with a slight horizontal displacement so that the unshifted dots do not fall exactly on top of one another, and it is viewed with spectacles having one red and one green or cyan lens. Also called a Julesz stereogram. See also Cyclopean perception, stereopsis, visual illusion. Compare random-dot kinematogram. [From Greek stereos solid + gramme a line]

Subjects: Psychology.

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