4:2:0 色度采样在每条横向扫描线上只有亮度采样的一半,扫描线的条数上,也只有亮度的一半!换句话说,无论是横向还是纵向,色度信号的分辨率都只有亮度信号的一半.“缺失”的色度采样不单单要由左右相邻的采样通过内插补点计算补充,整行的色度采样也要通过它上下两行的色度采样通过内插补点运算获得。
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