Stereoscopy

Stereoscopy, also called stereoscopics or stereo imaging, refers to making images appear three-dimensional. The most popular kind of stereoscopy is two-view stereoscopy, which creates partial depth perception in an image from a set of two two-dimensional images by using binocular disparity. The word stereoscopy derives from Ancient Greek στερεός (stereós) 'firm, solid' and σκοπέω (skopéō) 'to look, to see'. Any stereoscopic image is called a stereogram. Originally, stereogram referred to a pair of two-dimensional images that could be viewed using a stereoscope. Most stereoscopic methods present a pair of two-dimensional images to the viewer. The left image is presented to the left eye and the right image is presented to the right eye. When viewed, the human brain perceives the images as a single 3D view, giving the viewer the perception of 3D depth. However, the 3D effect lacks proper focal depth, which gives rise to the vergence-accommodation conflict. Stereoscopy is distinguished from other types of 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.