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A stereogram is an optical illusion by stereo viewing of depth brought into appearance by focusing one's eyes in front of (crossing one's eyes) or behind the stereo image one is looking at, often done with a device. The slight differences in repeated figures or random dots create the illusion of depth in the 2D image, just as the slight difference in perspective between one's eyes creates the perception of depth on 3D objects and scenes (like adult 3d stereogram). Stereograms had been created for years before being re-popularized by the creation of random-dot stereograms on computers. Instead of the traditional two photographs of an object or scene taken from a slightly different angle, in random dot stereograms the image is hidden until the viewer focuses the eyes correctly. The viewer must diverge their eyes in order to see a hidden 3-dimensional image within the pattern in the hidden image stereogram. The stereoscopic images have a horizontally repeating pattern which differs slightly with each repetition, therefore giving the illusion of depth when each eye focuses on a different part of the pattern. (this has nothing to do with stereograms, but the logo of this site may seem some depth if you move up and down while looking to the logo :-) |
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