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电视的画面清晰度是以水平清晰度作为单位。通俗地说，我们可以把电视上的画面以水平方向分割成很多很多扫描线，分得越细，这些画面就越清楚，而水平线数的扫描线数量也就越多。清晰度的单位是“电视行(TVLine)”也称线。
参考文章：扫描线
后更。。。
扫描线(Scanning Line)
扫描线是在显示设备，如电视或计算机显示器中，光束沿着屏幕移动的路径。它是视频系统的基本组成部分，包括电视、计算机图形等。最常见的两种扫描方式是隔行扫描和逐行扫描。
水平清晰度
水平清晰度或水平分辨率是指屏幕上水平方向上能够区分的最小细节。这通常取决于显示器的物理特性以及视频信号的质量。换句话说，水平清晰度定义了显示器能够渲染的像素数量。
电视行(TVLine)
电视行(TVLine)是构成电视画面的水平线条的数量。每个电视行都包含一个从左到右的扫描线。例如，标准定义电视通常有480或576行，而高清电视可能有720或1080行。
隔行扫描（Interlaced Scanning）
隔行扫描是一种旧式的视频扫描技术，其中每个帧只显示所有奇数行，然后显示所有偶数行。这样做的目的是在保持视频流畅性的同时降低所需的带宽。
def interlaced_scanning(frame): odd_lines = frame[::2] even_lines = frame[1::2] return odd_lines, even_lines 逐行扫描（Progressive Scanning）
逐行扫描是一种更现代的视频扫描技术，其中每个帧按顺序从上到下显示所有行。这可以提供更高的画面质量，但需要更多的带宽。
def progressive_scanning(frame): return frame 参考文献
- TV Lines (TVL)
- What is Scanning Line?
- Interlaced vs. Progressive Scan – 1080i vs. 1080p
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