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Flying-spot scanner
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<p>A flying-spot scanner (FSS) uses a scanning source of a spot of light, such as a high-resolution, high-light-output, low-persistence <a href="/facts/Cathode_ray_tube/8NVGx5C7">cathode ray tube</a> (CRT), to scan an image. Usually the image to be scanned is on <a href="/facts/Photographic_film/37aFq6ls">photographic film</a>, such as <a href="/facts/Motion_picture_film/lbzV2rt4">motion picture film</a>, or a slide or <a href="/facts/Photographic_plate/LbTmHKJb">photographic plate</a>. The output of the scanner is usually a <a href="/facts/Television/X4YG5nT1">television</a> signal. </p>