![]() A hidden 3D scene emerges when the image is viewed with the correct vergence. In this type of autostereogram, every pixel in the image is computed from a pattern strip and a depth map. The well-known Magic Eye books feature another type of autostereogram called a random-dot autostereogram (see § Random-dot, below), similar to the first example, above. When viewed with proper vergence, the repeating patterns appear to float above or below the background. The simplest type of autostereogram consists of a horizontally repeating pattern with small changes throughout that looks like wallpaper. Individuals with disordered binocular vision and who cannot perceive depth may require a wiggle stereogram to achieve a similar effect. The optical illusion of an autostereogram is one of depth perception and involves stereopsis: depth perception arising from the different perspective each eye has of a three-dimensional scene, called binocular parallax. Viewing any kind of stereogram properly may cause the viewer to experience vergence-accommodation conflict. The 3D scene in an autostereogram is often unrecognizable until it is viewed properly, unlike typical stereograms. ![]() Autostereograms use only one image to accomplish the effect while normal stereograms require two. ![]() The top and bottom images produce a dent or projection depending on whether viewed with cross- ( ) or wall- ( ) eyed vergence.Īn autostereogram is a two-dimensional (2D) image that can create the optical illusion of a three-dimensional (3D) scene.
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