High Quality Content by WIKIPEDIA articles! A vectograph is a kind of stereoscopic technology that uses polarized glasses to view a three-dimensional photographic image embedded in a plastic sheet. Polaroid Corporation invented a technique to make a polarized filter sheet more or less strongly polarized in response to a photographic image projected on it. When the sheet is processed, it appears relatively clear in normal light, but viewed through a correctly-oriented polarizing filter, the image is seen. By stacking two of these sheets, a separate image may be transmitted to each eye, and when viewed through polarizing 3D glasses, the viewer sees a three-dimensional image.

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