Wiggle stereoscopy

Wiggle stereoscopy offers the advantages that no glasses or special hardware is required; most people can perceive the effect more quickly than when using cross-eyed and parallel viewing techniques. Furthermore, it offers stereo-like depth to people with limited or no vision in one eye. Disadvantages of wiggle stereoscopy are that it does not provide true binocular depth perception; it is not suitable for print media, being limited to displays that can alternate between the two images, and it is difficult to appreciate details in images that are constantly in motion. == Number and timing of images ==

Most wiggle images use only two images, yielding a jerky image. A smoother image can be composed by using several intermediate images and using the left and right images as end images of the image sequence. If intermediate images are not available, approximate images can be computed from the end images using techniques known as view interpolation. The two end images may be displayed for a longer time than the intermediate images to allow inspection of details in the left and right images. Another option for reducing the impression of jerkiness is to reduce the time between the frames of a wiggle image. == 3D photos from a single image ==

With advances in machine learning and computer vision, In this case one can use a segmentation model combined with a depth estimation model to estimate information relating to the distance of the surfaces of objects in the scene from a given viewpoint for every pixel in that image (known as a depth map), and with that information you can then render that pixel data as if it were 3 dimensional to create a subtle 3D effect. == Perception ==

The sense of depth from wiggle 3-D images is due to parallax and to changes to the occlusion of background objects. Although wiggle stereoscopy permits the perception of stereoscopic images, it is not a "true" three-dimensional stereoscopic display format in the sense that wiggle stereoscopy does not present the eyes with their own separate view each. The sense of depth may be enhanced by closing one eye, which removes the conflicting vergence visual cue of both eyes looking at the flat image plane. The apparent stereo effect results from syncing the timing of the wiggle and the amount of parallax to the processing done by the visual cortex. Three or five images with good parallax may produce a better effect than simple left and right images. Wiggling works for the same reason that a transitional pan (or tracking shot) in a film provides good depth information: the visual cortex is able to infer distance information from motion parallax, the relative speed of the perceived motion of different objects on the screen. Many small animals bob their heads to create motion parallax (wiggling) so they can better estimate distance prior to jumping. ==Gallery==

File:Stereo wiggle 3D.gif|Example of wiggle stereoscopy File:BLUE STEREO 3D Time for Space Wiggle.gif|A wiggle stereogram of the Sun alternating between left and right eye images taken by the NASA's STEREO solar observation mission File:Home plate anim.gif|Layered rock at the Home Plate plateau on Mars File:WWIScottsEntrenched 3D.gif|World War I stereo view File:The Jinriksha. The chief mode of travel in Japan for Centuries..gif|A jinrikisha in Japan, c. 1901 File:Test of 3-d wiggle for FPC.gif|A wiggle image of a model railroad using 4 frames repeating 1-2-3-4-3-2 ==See also==