Stereogram Tutorial - how it works, step by step

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2024-05-01 07:30:05

Stereograms are illusions of 3D surfaces. This tutorial shows how it works, with a simple "do it by yourself" approach. The random dot stereogram is very easy to understand, although not a trivial concept. Unlike holograms that require laser beams, stereograms can be created, printed and visualized with computers. But it may not be an easy task to see its 3D surfaces.

Stereo Pairs / stereograms work because the brain can detect small differences between the images seen by each eye. Stereo pairs have been studied for a long time - Leonardo da Vinci almost discovered the concepts of stereo pair visualization. But only Wheatstone correctly described these concepts. Random dot stereograms is a very new discovery, developed by Bela Julezs, during 1970's. Random Dot Stereograms give us a deep impact because there is an invisible hidden surface.

The visualization of a stereogram requires an unusual skill: each eye must be targeted to distinct places on the image. This is unusual to our brains. That is the reason some people hardly (or can not) see stereograms.