Interlaced Video is a technique for doubling the perceived Frame rate of a Video display without consuming extra bandwidth. The interlaced signal contains two fields of a Video frame captured at two different times. This enhances motion perception to the viewer, and reduces flicker by taking advantage of the phi phenomenon.
This effectively doubles the time resolution (also called temporal resolution) as compared to non-interlaced footage (for Frame rates equal to field rates). interlaced signals require a display that is natively capable of showing the individual fields in a sequential order. Only CRT displays and ALiS plasma displays are capable of displaying interlaced signals, due to the electronic scanning and lack of apparent fixed-resolution.
interlaced scan refers to one of two common methods for "painting" a Video image on an electronic display screen (the other being progressive scan) by scanning or displaying each line or row of pixels. This technique uses two fields to create a frame. One field contains all odd-numbered lines in the image; the other contains all even-numbered lines.
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