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In television, 2:1 interlace is used, giving two vertical scans(fields) per frame; one field scans odd lines, and one field scans the even lines of the frame.
电视中使用2:1的交错率,即每帧分两场,垂直扫描两次,一场扫描奇数行,另一场扫描偶数行。
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