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隔行扫描电视系统虽因有效地利用了频道而被广泛采用,但它同时也引入了频谱混叠,产生了行间闪烁及爬行现象,从而使电视图像质量下降。数字电视倍行处理是在不改变目前电视制式的前提下消除行间闪烁及爬行现象的有效手段。一、基本原理 (一)倍行概念众所周知,隔行扫描方式就是将两个每1/50秒扫描312.5线(半帧即一场)的图像组合,构成625线(一帧)图像,两场的图像组合是由人眼视觉暂留而形成的;而倍行扫描方式是在以往的一行扫描时间内进行两次扫描,它以连续扫描625行的方式显示图像,由于扫描线数增加了一倍,使得扫描线的能见度降低了l/2,这虽不增加信号清晰度,但因改善了kell因数,
Although interlaced television systems are widely used due to the efficient use of channels, they also introduce spectral aliasing, resulting in flickering and creeping between lines, resulting in degraded television picture quality. Digital TV multiple processing is an effective means of eliminating flicker and creeping between lines without changing the current television system. First, the basic principle of (A) times the line concept As we all know, interlaced scanning is the way to scan the two 312.5 lines (field that is a field) image every 1/50 second to form a 625 line (one frame) image, two Image combination is formed by the human visual persistence; and double-scan mode is in the previous line scan time two scans, it continuously scan 625 lines to display images, due to double the number of scan lines , Making the scan line visibility reduced by 1/2, although this does not increase the signal clarity, but due to improved kell factor,