7/4/2023 0 Comments Stereogram illusionOne sees the wallpaper floating in space in front of its true position. Now the visual patterns viewed by the eyes are identical, except for the unpaired parts of the pattern in far peripheral vision, but the convergence angle is closer than the wall. At a certain point, one part of the repeating pattern is imaged in central vision of the left eye and that part's neighbour, immediately to the left, is imaged in central vision of the right eye. To see this illusion, view a flat wall covered with a wallpaper showing a regular, horizontally repeating pattern then converge the eyes on a point in space closer than the wall. He observed, and worked out the principles of, the wallpaper illusion. The first phase was the early conceptual development, which began with Sir David Brewster in 1844. The history of the autostereogram falls into five phases. In order to do so, however, the viewer must overcome the natural tendency of the eyes to focus at the convergence distance, and enable the eyes to refocus at the plane of the image. The disparity structure may be designed to correspond to the depth map of any desired three-dimensional scene, which is perceived when the eyes are held at the appropriate convergence angle. When the eyes either converge or diverge at the distance of the pattern repeat, small differences between adjacent pattern cycles provide binocular disparities that are interpreted by the viewer as differences in depth. When viewing with normal convergence of the eyes on the physical plane, the image appears only as a flat repeating pattern. The principle of the autostereogram is a horizontally repetitive image in which the repeated pattern is modulated in such a way that the image can be viewed with an abnormal convergence or divergence angle to generate the visual impression of a stereoscopic depth image within the space of the pattern. Christopher Tyler, The Smith-Kettlewell Eye Research InstituteĪutostereogram refers to a single-image form of stereograms that can be free-viewed to achieve a stereoscopic, three-dimensional (3D), depth effect without a stereoscope or any other artificial aids to binocular fusion (see Figure 1).
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