Autostereogram
(重定向自Rastergram)

![Aligned vergence and accommodation. How one usually views objects.[1]](/uploads/202502/06/Autostereogram_normal_vergence.svg5920.png)
![Cross-eyed vergence ().[1] Arrow indicates accommodation.](/uploads/202502/06/Autostereogram_cross-eyed_vergence.svg5920.png)

An autostereogram is a single-image stereogram (SIS), designed to create the visual illusion of a three-dimensional (3D) scene from a two-dimensional image. In order to perceive 3D shapes in these autostereograms, one must overcome the normally automatic coordination between accommodation (focus) and horizontal vergence (angle of one's eyes). The illusion is one of depth pe****tion and involves stereopsis: depth pe****tion arising from the different perspective each eye has of a three-dimensional scene, called binocular parallax.