Interlace (i)

Interlace Scan Video

A recorded video image consists of horizontal scan lines, with the number of scan lines ultimately determining the resolution, or quality, of the video image. Rapidly scanning these lines across the display, starting at the top of the screen and moving to bottom, produces each frame of the video image. Interlacing the video image is a technique where all the scan lines are split into two fields. The first field consists of all of the odd numbered (or even numbered) displayed lines. The second field consists of all the even numbered (or odd numbered) lines. As these lines interface each other, a complete frame of video is displayed. Therefore, a 30 frame/second interlaced video image would contain 60 fields/second. The first displayed field (whether odd or even) is called the field dominance.

Published: May 29, 2005
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