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Because each frame of interlaced video is composed of two fields that are captured at different moments, interlaced video frames will exhibit motion artifacts if the objects are moving fast enough to be in different positions when each individual field is captured. The artifacts may be more visible when interlaced video is displayed at slower speeds than when it was captured.
Some televisions that are promoted as 1080p actually use a format called deinterlacing to minimize the artifacts caused by interlaced video display on a progressive scan monitor. There are two methods of deinterlacing: combination and extension. In combination, the even and odd frames are combined into one image and displayed. In extension, each frame (with half the lines) is extended to the entire screen. It is in imperfect process and often results in image degradation.
When displaying video on a monitor that can support a high enough refresh rate so flicker isn't perceivable, interlaced video can be deinterlaced. All current displays except for CRT screens require deinterlacing.