After analyzing why the focal length changes, I give an automaticfocus algorithm controlled by computer.
对自动聚焦问题，分析了焦距变化的原因，给出了计算机控制的自动聚焦算法。
2
To keep the measurement light focusing on the measured surface, an automaticfocus unit is very important.
要保证测量光聚焦在待测表面，自动聚焦控制是非常重要的。
3
Smartphones also typically feature cameras with a macro mode that allows automaticfocus over very short distances to scan codes that appear in a newspaper or magazine.