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Glossary
terms beginning with the letter P.
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Progressive Scan

Progressive scan is a method for displaying, storing or transmitting moving images in which all the lines of each frame are drawn in sequence. The video signal beam does not skip alternate lines, but fills in each line every time, which tends to render smoother motion sequences.

This is in contrast to the interlacing used in traditional television systems where only the odd lines, then the even lines of each frame (each image now called a field) are drawn alternately.

Advantages of progressive scan include a higher vertical resolution than interlaced video with the same frame rate, an absence of visual artifacts associated with interlaced video of the same line rate, and better results when scaling to higher resolutions than equivalent interlaced video, such as upconverting 480p to display on a 1080p HDTV. A disadvantage of progressive scan is that it requires higher bandwidth than interlaced video that has the same frame size and vertical refresh rate.

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