![]() The cues that the brain uses to gauge relative distances and depth in a perceived scene include: One of the functions that occur within the brain as it interprets what the eyes see is assessing the relative distances of objects from the viewer, and the depth dimension of those objects. Human vision, including the perception of depth, is a complex process, which only begins with the acquisition of visual information taken in through the eyes much processing ensues within the brain, as it strives to make sense of the raw information. Stereoscopy creates the illusion of three-dimensional depth from a pair of two-dimensional images. 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. However, the 3D effect lacks proper focal depth, which gives rise to the Vergence-Accommodation Conflict. When viewed, the human brain perceives the images as a single 3D view, giving the viewer the perception of 3D depth. The left image is presented to the left eye and the right image is presented to the right eye. Most stereoscopic methods present a pair of two-dimensional images to the viewer. Originally, stereogram referred to a pair of stereo images which could be viewed using a stereoscope. Any stereoscopic image is called a stereogram. ![]() The word stereoscopy derives from Greek στερεός (stereos) 'firm, solid', and σκοπέω (skopeō) 'to look, to see'. Stereoscopy (also called stereoscopics, or stereo imaging) is a technique for creating or enhancing the illusion of depth in an image by means of stereopsis for binocular vision. An early depiction of people using a stereoscope. A company of ladies looking at stereoscopic views, painting by Jacob Spoel, before 1868. 1870s Kaiserpanorama consists of a multi-station viewing apparatus and sets of stereo slides. 1890s Stereoscopic image of 772 College Street (formerly Johnson Street) in Macon, Ga, c. ![]() 1860 an early stereoscopic card for viewing a scene from nature Stereoscopic image of 787 Orange Street, Addison R. Used by military to examine stereoscopic pairs of aerial photographs. Pocket stereoscope with original test image.
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