Make your own Sird

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HOW IT WORKS: Principles of 3D Imagery



All single-image 3D systems (eg red-green glasses 3D) work on the principle that the left and right eyes see different features on the image plane which the brain interprets as a 3D object (see diagram above). The glasses ensure that each eye sees only one of the two images (with red/green specs, the eye with the RED filter only sees the GREEN image). Other technologies for the same effect include polarized images/glasses (used for a few films), and flashing left/right dark/clear LCD specs with corresponding alternate left and right images on a computer screen.

BUT with autostereograms any point for the right eye is ALSO seen by the left eye as shown below. An interpretation must then be made for that, so an extra point X is introduced, as a corresponding point for the right eye. This dependence must continue and be repeated across the entire display.

For the purpose of generating SIRDS it is usual to assume the geometry below, where the eyes 'move' along the image.

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