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In interlaced video, the horizontal scan lines of each complete frame are treated as if numbered consecutively, and captured as two fields: an odd field (upper field) consisting of the odd-numbered lines and an even field (lower field) consisting of the even-numbered lines.

Analog display devices reproduce each frame, effectively doubling the frame rate as far as perceptible overall flicker is concerned.

Film is shot at the slower frame rate of 24 frames per second, which slightly complicates the process of transferring a cinematic motion picture to video.Video was first developed for mechanical television systems, which were quickly replaced by cathode ray tube (CRT) systems which were later replaced by flat panel displays of several types.Video systems vary in display resolution, aspect ratio, refresh rate, color capabilities and other qualities.Deinterlacing cannot, however, produce video quality that is equivalent to true progressive scan source material.Aspect ratio describes the proportional relationship between the width and height of video screens and video picture elements.

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