Autostereograms are two-dimensional 2D images with repeating patterns that hide an underlying three-dimensional 3D image. A picture within a picture, so to speak. They are not the same as stereograms. Stereograms require the use of a stereoscope for the 3D image to be seen. Autostereograms, on the other hand, do not require a stereoscope. The hidden 3D image can be seen with just the naked eye, provided that the correct vergence is achieved.
The differences are mainly in the relative horizontal position of objects in the two images. These positional differences are referred to as horizontal disparities or, more generally, binocular disparities. Disparities are processed in the visual cortex of the brain to yield depth perception. While binocular disparities are naturally present when viewing a real 3-dimensional scene with two eyes, they can also be simulated by artificially presenting two different images separately to each eye using a method called stereoscopy. The perception of depth in such cases is also referred to as "stereoscopic depth".
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