Random Dot Stereogram
Random-dot stereogram (RDS) is stereo pair of images of random dots which 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, with objects appearing to be in front of or behind the display level.
The random-dot stereogram technique, already known since 1919, was much used by Dr. Béla Julesz and it, along with additional research, lead to publication of an influential book detailing his theories and work on the basis of human stereo vision entitled Foundations of Cyclopean Perception.
Later concepts, involving single images, not necessarily consisting of random dots, and more well known to the general public, are known as autostereograms.
Read more about Random Dot Stereogram: Development, Implications, Further Development, Illustrated Example
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