Random dot stereogram
Type of 3D image / From Wikipedia, the free encyclopedia
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A random-dot stereogram (RDS) is stereo pair of images of random dots that, when viewed with the aid of a stereoscope, or with the eyes focused on a point in front of or behind the images, produces a sensation of depth due to stereopsis, with objects appearing to be in front of or behind the display level.
The random-dot stereogram technique, known since 1919, was elaborated on by Béla Julesz, described in his 1971 book, Foundations of Cyclopean Perception.
Later concepts, involving single images, not necessarily consisting of random dots, and more well known to the general public, are autostereograms.