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Definition of "pincushion distortion" |
the geometric distortion present in an image in which both horizontal and vertical lines appear to collapse toward the display center. For a CRT image system, pincushion distortion is a result of the interaction of the long face plate radius of curvature and the short radius from the deflection center to the face plate. The interaction causes the top, bottom, left, and right raster center points to be closer to the center of the CRT face plate deflection than the top left, top right, bottom left, and bottom right raster corners. Consequently, a square grid has the appearance of a pin cushion. |
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