The simplest type of autostereogram consists of horizontally repeating patterns (often separate images) and is known as a wallpaper autostereogram. The illusion 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. 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). Animation can be done in a web browser with an animated GIF image, Flash animation, or JavaScript program.Īn 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 contrast to other stereo display techniques, the same image is presented to both eyes. The sense of depth from such images is due to parallax and to changes to the occlusion of background objects. This technique is also called wiggle 3-D or wobble 3-D, sometimes also Piku-Piku (Japanese for "twitching") Wiggle stereoscopy is an example of stereoscopy in which left and right images of a stereogram are animated. This technique is distinguished from 3D displays that display an image in three full dimensions, allowing the observer to increase information about the 3-dimensional objects being displayed by head and eye movements. These two-dimensional images are then combined in the brain to give the perception of 3D depth. Most stereoscopic methods present two offset images separately to the left and right eye of the viewer. Originally, stereogram referred to a pair of stereo images which could be viewed using a stereoscope. The word stereoscopy derives from Greek στερεός (stereos), meaning "firm, solid", and σκοπέω (skopeō), meaning "to look, to see" Any stereoscopic image is called a stereogram. Stereoscopy (also called stereoscopics) is a technique for creating or enhancing the illusion of depth in an image by means of stereopsis for binocular vision. Below are a few different types of Stereo Illusions that achieve this effect. Stereo illusions are 2D images that trick the brain into seeing a 3D scene giving the viewer the illusion of depth where the image appears to pop out from the background.
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