| Back | 利用多次垂直扫描来重显一幅完整图象的扫描技术。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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| Front | lìyòng duōcì chuízhí sǎomiáo lái zhòng xiǎn yī fú wánzhěng túxiàng de sǎomiáo jìshù diànshì zhōng shǐyòng de jiāocuò lǜ jí měi zhēn fēn liǎng chǎng chuízhí sǎomiáo liǎng cì yī chǎng sǎomiáo jīshù xíng lìngyī chǎng sǎomiáo ǒushù xíng In scanning, the technique of using more than one vertical scan to reproduce a complete image. 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. |
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